Use codegen to reduce library size by a lot

Cargo.toml

@@ -1,9 +1,10 @@
 [package]
-name = "activitypub"
+name = "activitystreams"
 version = "0.1.0"
 authors = ["asonix <asonix.dev@gmail.com>"]
 
 [dependencies]
+activitystreams-derive = { version = "0.1", path = "activitystreams-derive" }
 failure = "0.1"
 mime = "0.3"
 serde = "1.0"

activitystreams-derive/.gitignore

@@ -0,0 +1,3 @@
+/target
+**/*.rs.bk
+Cargo.lock

activitystreams-derive/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "activitystreams-derive"
+version = "0.1.0"
+authors = ["asonix <asonix.dev@gmail.com>"]
+
+[dependencies]
+quote = "0.5"
+syn = "0.13"
+proc-macro2 = "0.3"
+
+[lib]
+proc-macro = true

activitystreams-derive/src/lib.rs

@@ -0,0 +1,351 @@
+extern crate proc_macro;
+extern crate proc_macro2;
+extern crate syn;
+
+#[macro_use]
+extern crate quote;
+
+use proc_macro::TokenStream;
+use proc_macro2::TokenTree;
+use quote::Tokens;
+use syn::{Attribute, Data, DeriveInput, Fields, Ident, Type};
+
+#[proc_macro_derive(UnitString, attributes(activitystreams))]
+pub fn unit_string(input: TokenStream) -> TokenStream {
+    let input: DeriveInput = syn::parse(input).unwrap();
+
+    let name = input.ident;
+
+    let attr = input
+        .attrs
+        .iter()
+        .find(|attribute| {
+            attribute
+                .path
+                .segments
+                .last()
+                .map(|segment| {
+                    let segment = segment.into_value();
+                    segment.ident == Ident::new("activitystreams", segment.ident.span())
+                })
+                .unwrap_or(false)
+        })
+        .unwrap()
+        .clone();
+
+    let value = get_value(attr);
+
+    let visitor_name = Ident::from(format!("{}Visitor", value));
+
+    let serialize = quote! {
+        impl Serialize for #name {
+            fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+            where
+                S: Serializer,
+            {
+                serializer.serialize_str(#value)
+            }
+        }
+    };
+
+    let expecting = quote! {
+        fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+            write!(formatter, "The string '{}'", #value)
+        }
+    };
+
+    let visit = quote! {
+        fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
+        where
+            E: de::Error,
+        {
+            if v == #value {
+                Ok(#name)
+            } else {
+                Err(de::Error::custom("Invalid type"))
+            }
+        }
+    };
+
+    let visitor = quote! {
+        pub struct #visitor_name;
+
+        impl<'de> Visitor<'de> for #visitor_name {
+            type Value = #name;
+
+            #expecting
+
+            #visit
+        }
+    };
+
+    let deserialize = quote! {
+        impl<'de> Deserialize<'de> for #name {
+            fn deserialize<D>(deserializer: D) -> Result<#name, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                deserializer.deserialize_str(#visitor_name)
+            }
+        }
+    };
+
+    let c = quote! {
+        #serialize
+        #visitor
+        #deserialize
+    };
+
+    c.into()
+}
+
+fn get_value(attr: Attribute) -> String {
+    let group = attr.tts
+        .clone()
+        .into_iter()
+        .filter_map(|token_tree| match token_tree {
+            TokenTree::Group(group) => Some(group),
+            _ => None,
+        })
+        .next()
+        .unwrap();
+
+    group
+        .stream()
+        .clone()
+        .into_iter()
+        .filter_map(|token_tree| match token_tree {
+            TokenTree::Term(term) => Some(term.as_str().to_owned()),
+            _ => None,
+        })
+        .next()
+        .unwrap()
+}
+
+#[proc_macro_derive(Properties, attributes(activitystreams))]
+pub fn properties_derive(input: TokenStream) -> TokenStream {
+    let input: DeriveInput = syn::parse(input).unwrap();
+
+    let name = input.ident;
+
+    let data = match input.data {
+        Data::Struct(s) => s,
+        _ => panic!("Can only derive for structs"),
+    };
+
+    let fields = match data.fields {
+        Fields::Named(fields) => fields,
+        _ => panic!("Can only derive for named fields"),
+    };
+
+    let getters = fields
+        .named
+        .iter()
+        .filter_map(|field| {
+            let our_attr = field.attrs.iter().find(|attribute| {
+                attribute
+                    .path
+                    .segments
+                    .last()
+                    .map(|segment| {
+                        let segment = segment.into_value();
+                        segment.ident == Ident::new("activitystreams", segment.ident.span())
+                    })
+                    .unwrap_or(false)
+            });
+
+            if our_attr.is_some() {
+                let our_attr = our_attr.unwrap();
+
+                let is_option = match field.ty {
+                    Type::Path(ref path) => path.path
+                        .segments
+                        .last()
+                        .map(|seg| {
+                            let seg = seg.into_value();
+                            seg.ident == Ident::new("Option", seg.ident.span())
+                        })
+                        .unwrap_or(false),
+                    _ => false,
+                };
+
+                let is_vec = match field.ty {
+                    Type::Path(ref path) => path.path
+                        .segments
+                        .last()
+                        .map(|seg| {
+                            let seg = seg.into_value();
+                            seg.ident == Ident::new("Vec", seg.ident.span())
+                        })
+                        .unwrap_or(false),
+                    _ => false,
+                };
+
+                Some((
+                    field.ident.clone().unwrap(),
+                    is_option,
+                    is_vec,
+                    is_functional(our_attr.clone()),
+                    our_attr.clone(),
+                ))
+            } else {
+                None
+            }
+        })
+        .flat_map(|(ident, is_option, is_vec, is_functional, attr)| {
+            variants(attr)
+                .into_iter()
+                .map(move |(variant, is_concrete)| {
+                    let lower_variant = variant.to_lowercase();
+                    let fn_name = Ident::from(format!("{}_{}", ident, lower_variant));
+                    let fn_plural = Ident::from(format!("{}_{}_vec", ident, lower_variant));
+                    let variant = Ident::from(variant);
+
+                    if is_concrete && is_option && is_functional {
+                        quote! {
+                            pub fn #fn_name(&self) -> Result<#variant> {
+                                self.get_item(|t| &t.#ident)
+                            }
+                        }
+                    } else if is_concrete && is_option {
+                        quote! {
+                            pub fn #fn_name(&self) -> Result<#variant> {
+                                self.get_item(|t| &t.#ident)
+                            }
+
+                            pub fn #fn_plural(&self) -> Result<Vec<#variant>> {
+                                self.get_item(|t| &t.#ident)
+                            }
+                        }
+                    } else if is_concrete && is_vec {
+                        quote! {
+                            pub fn #fn_name(&self) -> Result<Vec<#variant>> {
+                                self.get_vec(|t| &t.#ident)
+                            }
+                        }
+                    } else if is_concrete && is_functional {
+                        quote! {
+                            pub fn #fn_name(&self) -> Result<#variant> {
+                                self.get_value(|t| &t.#ident)
+                            }
+                        }
+                    } else if is_concrete {
+                        quote! {
+                            pub fn #fn_name(&self) -> Result<#variant> {
+                                self.get_value(|t| &t.#ident)
+                            }
+
+                            pub fn #fn_plural(&self) -> Result<Vec<#variant>> {
+                                self.get_value(|t| &t.#ident)
+                            }
+                        }
+                    } else if is_option && is_functional {
+                        quote! {
+                            pub fn #fn_name<T: #variant>(&self) -> Result<T> {
+                                self.get_item(|t| &t.#ident)
+                            }
+                        }
+                    } else if is_option {
+                        quote! {
+                            pub fn #fn_name<T: #variant>(&self) -> Result<T> {
+                                self.get_item(|t| &t.#ident)
+                            }
+
+                            pub fn #fn_plural<T: #variant>(&self) -> Result<Vec<T>> {
+                                self.get_item(|t| &t.#ident)
+                            }
+                        }
+                    } else if is_vec {
+                        quote! {
+                            pub fn #fn_name<T: #variant>(&self) -> Result<Vec<T>> {
+                                self.get_vec(|t| &t.#ident)
+                            }
+                        }
+                    } else if is_functional {
+                        quote! {
+                            pub fn #fn_name<T: #variant>(&self) -> Result<T> {
+                                self.get_value(|t| &t.#ident)
+                            }
+                        }
+                    } else {
+                        quote! {
+                            pub fn #fn_name<T: #variant>(&self) -> Result<T> {
+                                self.get_value(|t| &t.#ident)
+                            }
+
+                            pub fn #fn_plural<T: #variant>(&self) -> Result<Vec<T>> {
+                                self.get_value(|t| &t.#ident)
+                            }
+                        }
+                    }
+                })
+        });
+
+    let mut tokens = Tokens::new();
+    tokens.append_all(getters);
+
+    let full = quote!{
+        impl Properties for #name {}
+
+        impl #name {
+            #tokens
+        }
+    };
+
+    full.into()
+}
+
+fn variants(attr: Attribute) -> Vec<(String, bool)> {
+    let group = attr.tts
+        .clone()
+        .into_iter()
+        .filter_map(|token_tree| match token_tree {
+            TokenTree::Group(group) => Some(group),
+            _ => None,
+        })
+        .next()
+        .unwrap();
+
+    let mut is_concrete = false;
+
+    group
+        .stream()
+        .clone()
+        .into_iter()
+        .filter_map(|token_tree| match token_tree {
+            TokenTree::Term(term) => {
+                is_concrete = term.as_str() == "concrete";
+                None
+            }
+            TokenTree::Group(group) => Some(group.stream().into_iter().filter_map(
+                move |token_tree| match token_tree {
+                    TokenTree::Term(term) => Some((term.as_str().to_owned(), is_concrete)),
+                    _ => None,
+                },
+            )),
+            _ => None,
+        })
+        .flat_map(|i| i)
+        .collect()
+}
+
+fn is_functional(attr: Attribute) -> bool {
+    let group = attr.tts
+        .clone()
+        .into_iter()
+        .filter_map(|token_tree| match token_tree {
+            TokenTree::Group(group) => Some(group),
+            _ => None,
+        })
+        .next()
+        .unwrap();
+
+    group
+        .stream()
+        .clone()
+        .into_iter()
+        .any(|token_tree| match token_tree {
+            TokenTree::Term(term) => term.as_str() == "functional",
+            _ => false,
+        })
+}

src/activity/accept.rs

@@ -2,48 +2,29 @@ use serde_json;
 
 use super::{kind::AcceptType, properties::ActivityProperties, Activity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
+use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Accept {
     #[serde(rename = "type")]
     kind: AcceptType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl Accept {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn objects<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-}
-
 impl Object for Accept {}
 impl Activity for Accept {}

src/activity/add.rs

@@ -2,48 +2,29 @@ use serde_json;
 
 use super::{kind::AddType, properties::ActivityProperties, Activity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
+use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Add {
     #[serde(rename = "type")]
     kind: AddType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl Add {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn objects<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-}
-
 impl Object for Add {}
 impl Activity for Add {}

src/activity/amove.rs

@@ -2,87 +2,37 @@ use serde_json;
 
 use super::{kind::MoveType, properties::ActivityProperties, Activity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
 use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct AMove {
     #[serde(rename = "type")]
     kind: MoveType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Object, Link))]
     origin: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Object, Link))]
     target: Option<serde_json::Value>,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl Properties for AMove {}
-
-impl AMove {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn objects<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn origin<O: Object>(&self) -> Result<O> {
-        self.get_item(|m| &m.origin)
-    }
-
-    pub fn origins<O: Object>(&self) -> Result<Vec<O>> {
-        self.get_item(|m| &m.origin)
-    }
-
-    pub fn origin_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|m| &m.origin)
-    }
-
-    pub fn origin_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|m| &m.origin)
-    }
-
-    pub fn target<O: Object>(&self) -> Result<O> {
-        self.get_item(|m| &m.target)
-    }
-
-    pub fn targets<O: Object>(&self) -> Result<Vec<O>> {
-        self.get_item(|m| &m.target)
-    }
-
-    pub fn target_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|m| &m.target)
-    }
-
-    pub fn target_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|m| &m.target)
-    }
-}
-
 impl Object for AMove {}
 impl Activity for AMove {}

src/activity/announce.rs

@@ -2,69 +2,33 @@ use serde_json;
 
 use super::{kind::AnnounceType, properties::ActivityProperties, Activity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
 use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Announce {
     #[serde(rename = "type")]
     kind: AnnounceType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Object, Link))]
     target: Option<serde_json::Value>,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl Properties for Announce {}
-
-impl Announce {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn objects<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn target<O: Object>(&self) -> Result<O> {
-        self.get_item(|m| &m.target)
-    }
-
-    pub fn targets<O: Object>(&self) -> Result<Vec<O>> {
-        self.get_item(|m| &m.target)
-    }
-
-    pub fn target_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|m| &m.target)
-    }
-
-    pub fn target_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|m| &m.target)
-    }
-}
-
 impl Object for Announce {}
 impl Activity for Announce {}

src/activity/arrive.rs

@@ -2,74 +2,33 @@ use serde_json;
 
 use super::{kind::ArriveType, properties::ActivityProperties, Activity, IntransitiveActivity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
+use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Arrive {
     #[serde(rename = "type")]
     kind: ArriveType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     location: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     origin: serde_json::Value,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl Arrive {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn location<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.location.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn locations<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.location.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn location_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.location.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn location_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.location.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn origin<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.origin.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn origins<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.origin.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn origin_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.origin.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn origin_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.origin.clone()).map_err(|_| Error::Deserialize)
-    }
-}
-
 impl Object for Arrive {}
 impl Activity for Arrive {}
 impl IntransitiveActivity for Arrive {}

src/activity/block.rs

@@ -2,48 +2,29 @@ use serde_json;
 
 use super::{kind::BlockType, properties::ActivityProperties, Activity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
+use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Block {
     #[serde(rename = "type")]
     kind: BlockType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl Block {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn objects<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-}
-
 impl Object for Block {}
 impl Activity for Block {}

src/activity/create.rs

@@ -2,48 +2,29 @@ use serde_json;
 
 use super::{kind::CreateType, properties::ActivityProperties, Activity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
+use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Create {
     #[serde(rename = "type")]
     kind: CreateType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl Create {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn objects<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-}
-
 impl Object for Create {}
 impl Activity for Create {}

src/activity/delete.rs

@@ -2,69 +2,33 @@ use serde_json;
 
 use super::{kind::DeleteType, properties::ActivityProperties, Activity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
 use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Delete {
     #[serde(rename = "type")]
     kind: DeleteType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Object, Link))]
     origin: Option<serde_json::Value>,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl Properties for Delete {}
-
-impl Delete {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn objects<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn origin<O: Object>(&self) -> Result<O> {
-        self.get_item(|d| &d.origin)
-    }
-
-    pub fn origins<O: Object>(&self) -> Result<O> {
-        self.get_item(|d| &d.origin)
-    }
-
-    pub fn origin_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|d| &d.origin)
-    }
-
-    pub fn origin_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|d| &d.origin)
-    }
-}
-
 impl Object for Delete {}
 impl Activity for Delete {}

src/activity/dislike.rs

@@ -2,48 +2,29 @@ use serde_json;
 
 use super::{kind::DislikeType, properties::ActivityProperties, Activity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
+use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Dislike {
     #[serde(rename = "type")]
     kind: DislikeType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl Dislike {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn objects<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-}
-
 impl Object for Dislike {}
 impl Activity for Dislike {}

src/activity/flag.rs

@@ -2,48 +2,29 @@ use serde_json;
 
 use super::{kind::FlagType, properties::ActivityProperties, Activity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
+use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Flag {
     #[serde(rename = "type")]
     kind: FlagType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl Flag {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn objects<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-}
-
 impl Object for Flag {}
 impl Activity for Flag {}

src/activity/follow.rs

@@ -2,48 +2,29 @@ use serde_json;
 
 use super::{kind::FollowType, properties::ActivityProperties, Activity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
+use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Follow {
     #[serde(rename = "type")]
     kind: FollowType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl Follow {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn objects<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-}
-
 impl Object for Follow {}
 impl Activity for Follow {}

src/activity/ignore.rs

@@ -2,48 +2,29 @@ use serde_json;
 
 use super::{kind::IgnoreType, properties::ActivityProperties, Activity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
+use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Ignore {
     #[serde(rename = "type")]
     kind: IgnoreType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl Ignore {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn objects<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-}
-
 impl Object for Ignore {}
 impl Activity for Ignore {}

src/activity/invite.rs

@@ -2,65 +2,32 @@ use serde_json;
 
 use super::{kind::InviteType, properties::ActivityProperties, Activity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
+use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Invite {
     #[serde(rename = "type")]
     kind: InviteType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     target: serde_json::Value,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl Invite {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn objects<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn target<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.target.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn targets<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.target.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn target_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.target.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn target_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.target.clone()).map_err(|_| Error::Deserialize)
-    }
-}
-
 impl Object for Invite {}
 impl Activity for Invite {}

src/activity/join.rs

@@ -2,48 +2,29 @@ use serde_json;
 
 use super::{kind::JoinType, properties::ActivityProperties, Activity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
+use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Join {
     #[serde(rename = "type")]
     kind: JoinType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl Join {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn objects<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-}
-
 impl Object for Join {}
 impl Activity for Join {}

src/activity/kind.rs

@@ -0,0 +1,117 @@
+use std::fmt;
+
+use serde::{
+    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
+};
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Accept)]
+pub struct AcceptType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Add)]
+pub struct AddType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Move)]
+pub struct MoveType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Announce)]
+pub struct AnnounceType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Arrive)]
+pub struct ArriveType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Block)]
+pub struct BlockType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Create)]
+pub struct CreateType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Delete)]
+pub struct DeleteType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Dislike)]
+pub struct DislikeType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Flag)]
+pub struct FlagType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Follow)]
+pub struct FollowType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Ignore)]
+pub struct IgnoreType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Invite)]
+pub struct InviteType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Join)]
+pub struct JoinType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Leave)]
+pub struct LeaveType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Like)]
+pub struct LikeType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Listen)]
+pub struct ListenType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Offer)]
+pub struct OfferType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Question)]
+pub struct QuestionType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Real)]
+pub struct ReadType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Reject)]
+pub struct RejectType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Remove)]
+pub struct RemoveType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(TentativeAccept)]
+pub struct TentativeAcceptType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(TentativeReject)]
+pub struct TentativeRejectType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Travel)]
+pub struct TravelType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Undo)]
+pub struct UndoType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Update)]
+pub struct UpdateType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(View)]
+pub struct ViewType;

src/activity/kind/accept.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct AcceptType;
-
-impl Serialize for AcceptType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Accept")
-    }
-}
-
-pub struct AcceptTypeVisitor;
-
-impl<'de> Visitor<'de> for AcceptTypeVisitor {
-    type Value = AcceptType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Accept'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Accept" {
-            Ok(AcceptType)
-        } else {
-            Err(de::Error::custom("Type not Accept"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for AcceptType {
-    fn deserialize<D>(deserializer: D) -> Result<AcceptType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(AcceptTypeVisitor)
-    }
-}

src/activity/kind/add.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct AddType;
-
-impl Serialize for AddType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Add")
-    }
-}
-
-pub struct AddTypeVisitor;
-
-impl<'de> Visitor<'de> for AddTypeVisitor {
-    type Value = AddType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Add'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Add" {
-            Ok(AddType)
-        } else {
-            Err(de::Error::custom("Type not create"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for AddType {
-    fn deserialize<D>(deserializer: D) -> Result<AddType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(AddTypeVisitor)
-    }
-}

src/activity/kind/amove.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct MoveType;
-
-impl Serialize for MoveType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Move")
-    }
-}
-
-pub struct MoveTypeVisitor;
-
-impl<'de> Visitor<'de> for MoveTypeVisitor {
-    type Value = MoveType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Move'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Move" {
-            Ok(MoveType)
-        } else {
-            Err(de::Error::custom("Type not Move"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for MoveType {
-    fn deserialize<D>(deserializer: D) -> Result<MoveType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(MoveTypeVisitor)
-    }
-}

src/activity/kind/announce.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct AnnounceType;
-
-impl Serialize for AnnounceType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Announce")
-    }
-}
-
-pub struct AnnounceTypeVisitor;
-
-impl<'de> Visitor<'de> for AnnounceTypeVisitor {
-    type Value = AnnounceType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Announce'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Announce" {
-            Ok(AnnounceType)
-        } else {
-            Err(de::Error::custom("Type not Announce"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for AnnounceType {
-    fn deserialize<D>(deserializer: D) -> Result<AnnounceType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(AnnounceTypeVisitor)
-    }
-}

src/activity/kind/arrive.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct ArriveType;
-
-impl Serialize for ArriveType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Arrive")
-    }
-}
-
-pub struct ArriveTypeVisitor;
-
-impl<'de> Visitor<'de> for ArriveTypeVisitor {
-    type Value = ArriveType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Arrive'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Arrive" {
-            Ok(ArriveType)
-        } else {
-            Err(de::Error::custom("Type not Arrive"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for ArriveType {
-    fn deserialize<D>(deserializer: D) -> Result<ArriveType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(ArriveTypeVisitor)
-    }
-}

src/activity/kind/block.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct BlockType;
-
-impl Serialize for BlockType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Block")
-    }
-}
-
-pub struct BlockTypeVisitor;
-
-impl<'de> Visitor<'de> for BlockTypeVisitor {
-    type Value = BlockType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Block'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Block" {
-            Ok(BlockType)
-        } else {
-            Err(de::Error::custom("Type not Block"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for BlockType {
-    fn deserialize<D>(deserializer: D) -> Result<BlockType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(BlockTypeVisitor)
-    }
-}

src/activity/kind/create.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct CreateType;
-
-impl Serialize for CreateType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Create")
-    }
-}
-
-pub struct CreateTypeVisitor;
-
-impl<'de> Visitor<'de> for CreateTypeVisitor {
-    type Value = CreateType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Create'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Create" {
-            Ok(CreateType)
-        } else {
-            Err(de::Error::custom("Type not create"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for CreateType {
-    fn deserialize<D>(deserializer: D) -> Result<CreateType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(CreateTypeVisitor)
-    }
-}

src/activity/kind/delete.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct DeleteType;
-
-impl Serialize for DeleteType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Delete")
-    }
-}
-
-pub struct DeleteTypeVisitor;
-
-impl<'de> Visitor<'de> for DeleteTypeVisitor {
-    type Value = DeleteType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Delete'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Delete" {
-            Ok(DeleteType)
-        } else {
-            Err(de::Error::custom("Type not Delete"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for DeleteType {
-    fn deserialize<D>(deserializer: D) -> Result<DeleteType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(DeleteTypeVisitor)
-    }
-}

src/activity/kind/dislike.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct DislikeType;
-
-impl Serialize for DislikeType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Dislike")
-    }
-}
-
-pub struct DislikeTypeVisitor;
-
-impl<'de> Visitor<'de> for DislikeTypeVisitor {
-    type Value = DislikeType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Dislike'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Dislike" {
-            Ok(DislikeType)
-        } else {
-            Err(de::Error::custom("Type not Dislike"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for DislikeType {
-    fn deserialize<D>(deserializer: D) -> Result<DislikeType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(DislikeTypeVisitor)
-    }
-}

src/activity/kind/flag.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct FlagType;
-
-impl Serialize for FlagType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Flag")
-    }
-}
-
-pub struct FlagTypeVisitor;
-
-impl<'de> Visitor<'de> for FlagTypeVisitor {
-    type Value = FlagType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Flag'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Flag" {
-            Ok(FlagType)
-        } else {
-            Err(de::Error::custom("Type not Flag"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for FlagType {
-    fn deserialize<D>(deserializer: D) -> Result<FlagType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(FlagTypeVisitor)
-    }
-}

src/activity/kind/follow.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct FollowType;
-
-impl Serialize for FollowType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Follow")
-    }
-}
-
-pub struct FollowTypeVisitor;
-
-impl<'de> Visitor<'de> for FollowTypeVisitor {
-    type Value = FollowType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Follow'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Follow" {
-            Ok(FollowType)
-        } else {
-            Err(de::Error::custom("Type not Follow"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for FollowType {
-    fn deserialize<D>(deserializer: D) -> Result<FollowType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(FollowTypeVisitor)
-    }
-}

src/activity/kind/ignore.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct IgnoreType;
-
-impl Serialize for IgnoreType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Ignore")
-    }
-}
-
-pub struct IgnoreTypeVisitor;
-
-impl<'de> Visitor<'de> for IgnoreTypeVisitor {
-    type Value = IgnoreType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Ignore'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Ignore" {
-            Ok(IgnoreType)
-        } else {
-            Err(de::Error::custom("Type not Ignore"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for IgnoreType {
-    fn deserialize<D>(deserializer: D) -> Result<IgnoreType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(IgnoreTypeVisitor)
-    }
-}

src/activity/kind/invite.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct InviteType;
-
-impl Serialize for InviteType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Invite")
-    }
-}
-
-pub struct InviteTypeVisitor;
-
-impl<'de> Visitor<'de> for InviteTypeVisitor {
-    type Value = InviteType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Invite'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Invite" {
-            Ok(InviteType)
-        } else {
-            Err(de::Error::custom("Type not Invite"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for InviteType {
-    fn deserialize<D>(deserializer: D) -> Result<InviteType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(InviteTypeVisitor)
-    }
-}

src/activity/kind/join.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct JoinType;
-
-impl Serialize for JoinType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Join")
-    }
-}
-
-pub struct JoinTypeVisitor;
-
-impl<'de> Visitor<'de> for JoinTypeVisitor {
-    type Value = JoinType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Join'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Join" {
-            Ok(JoinType)
-        } else {
-            Err(de::Error::custom("Type not Join"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for JoinType {
-    fn deserialize<D>(deserializer: D) -> Result<JoinType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(JoinTypeVisitor)
-    }
-}

src/activity/kind/leave.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct LeaveType;
-
-impl Serialize for LeaveType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Leave")
-    }
-}
-
-pub struct LeaveTypeVisitor;
-
-impl<'de> Visitor<'de> for LeaveTypeVisitor {
-    type Value = LeaveType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Leave'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Leave" {
-            Ok(LeaveType)
-        } else {
-            Err(de::Error::custom("Type not Leave"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for LeaveType {
-    fn deserialize<D>(deserializer: D) -> Result<LeaveType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(LeaveTypeVisitor)
-    }
-}

src/activity/kind/like.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct LikeType;
-
-impl Serialize for LikeType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Like")
-    }
-}
-
-pub struct LikeTypeVisitor;
-
-impl<'de> Visitor<'de> for LikeTypeVisitor {
-    type Value = LikeType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Like'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Like" {
-            Ok(LikeType)
-        } else {
-            Err(de::Error::custom("Type not Like"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for LikeType {
-    fn deserialize<D>(deserializer: D) -> Result<LikeType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(LikeTypeVisitor)
-    }
-}

src/activity/kind/listen.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct ListenType;
-
-impl Serialize for ListenType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Listen")
-    }
-}
-
-pub struct ListenTypeVisitor;
-
-impl<'de> Visitor<'de> for ListenTypeVisitor {
-    type Value = ListenType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Listen'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Listen" {
-            Ok(ListenType)
-        } else {
-            Err(de::Error::custom("Type not Listen"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for ListenType {
-    fn deserialize<D>(deserializer: D) -> Result<ListenType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(ListenTypeVisitor)
-    }
-}

src/activity/kind/mod.rs

@@ -1,57 +0,0 @@
-mod accept;
-mod add;
-mod amove;
-mod announce;
-mod arrive;
-mod block;
-mod create;
-mod delete;
-mod dislike;
-mod flag;
-mod follow;
-mod ignore;
-mod invite;
-mod join;
-mod leave;
-mod like;
-mod listen;
-mod offer;
-mod question;
-mod read;
-mod reject;
-mod remove;
-mod tentative_accept;
-mod tentative_reject;
-mod travel;
-mod undo;
-mod update;
-mod view;
-
-pub use self::accept::*;
-pub use self::add::*;
-pub use self::amove::*;
-pub use self::announce::*;
-pub use self::arrive::*;
-pub use self::block::*;
-pub use self::create::*;
-pub use self::delete::*;
-pub use self::dislike::*;
-pub use self::flag::*;
-pub use self::follow::*;
-pub use self::ignore::*;
-pub use self::invite::*;
-pub use self::join::*;
-pub use self::leave::*;
-pub use self::like::*;
-pub use self::listen::*;
-pub use self::offer::*;
-pub use self::question::*;
-pub use self::read::*;
-pub use self::reject::*;
-pub use self::remove::*;
-pub use self::tentative_accept::*;
-pub use self::tentative_reject::*;
-pub use self::travel::*;
-pub use self::undo::*;
-pub use self::update::*;
-pub use self::view::*;

src/activity/kind/offer.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct OfferType;
-
-impl Serialize for OfferType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Offer")
-    }
-}
-
-pub struct OfferTypeVisitor;
-
-impl<'de> Visitor<'de> for OfferTypeVisitor {
-    type Value = OfferType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Offer'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Offer" {
-            Ok(OfferType)
-        } else {
-            Err(de::Error::custom("Type not Offer"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for OfferType {
-    fn deserialize<D>(deserializer: D) -> Result<OfferType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(OfferTypeVisitor)
-    }
-}

src/activity/kind/question.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct QuestionType;
-
-impl Serialize for QuestionType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Question")
-    }
-}
-
-pub struct QuestionTypeVisitor;
-
-impl<'de> Visitor<'de> for QuestionTypeVisitor {
-    type Value = QuestionType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Question'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Question" {
-            Ok(QuestionType)
-        } else {
-            Err(de::Error::custom("Type not Question"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for QuestionType {
-    fn deserialize<D>(deserializer: D) -> Result<QuestionType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(QuestionTypeVisitor)
-    }
-}

src/activity/kind/read.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct ReadType;
-
-impl Serialize for ReadType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Read")
-    }
-}
-
-pub struct ReadTypeVisitor;
-
-impl<'de> Visitor<'de> for ReadTypeVisitor {
-    type Value = ReadType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Read'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Read" {
-            Ok(ReadType)
-        } else {
-            Err(de::Error::custom("Type not Read"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for ReadType {
-    fn deserialize<D>(deserializer: D) -> Result<ReadType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(ReadTypeVisitor)
-    }
-}

src/activity/kind/reject.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct RejectType;
-
-impl Serialize for RejectType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Reject")
-    }
-}
-
-pub struct RejectTypeVisitor;
-
-impl<'de> Visitor<'de> for RejectTypeVisitor {
-    type Value = RejectType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Reject'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Reject" {
-            Ok(RejectType)
-        } else {
-            Err(de::Error::custom("Type not Reject"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for RejectType {
-    fn deserialize<D>(deserializer: D) -> Result<RejectType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(RejectTypeVisitor)
-    }
-}

src/activity/kind/remove.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct RemoveType;
-
-impl Serialize for RemoveType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Remove")
-    }
-}
-
-pub struct RemoveTypeVisitor;
-
-impl<'de> Visitor<'de> for RemoveTypeVisitor {
-    type Value = RemoveType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Remove'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Remove" {
-            Ok(RemoveType)
-        } else {
-            Err(de::Error::custom("Type not Remove"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for RemoveType {
-    fn deserialize<D>(deserializer: D) -> Result<RemoveType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(RemoveTypeVisitor)
-    }
-}

src/activity/kind/tentative_accept.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct TentativeAcceptType;
-
-impl Serialize for TentativeAcceptType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("TentativeAccept")
-    }
-}
-
-pub struct TentativeAcceptTypeVisitor;
-
-impl<'de> Visitor<'de> for TentativeAcceptTypeVisitor {
-    type Value = TentativeAcceptType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'TentativeAccept'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "TentativeAccept" {
-            Ok(TentativeAcceptType)
-        } else {
-            Err(de::Error::custom("Type not TentativeAccept"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for TentativeAcceptType {
-    fn deserialize<D>(deserializer: D) -> Result<TentativeAcceptType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(TentativeAcceptTypeVisitor)
-    }
-}

src/activity/kind/tentative_reject.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct TentativeRejectType;
-
-impl Serialize for TentativeRejectType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("TentativeReject")
-    }
-}
-
-pub struct TentativeRejectTypeVisitor;
-
-impl<'de> Visitor<'de> for TentativeRejectTypeVisitor {
-    type Value = TentativeRejectType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'TentativeReject'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "TentativeReject" {
-            Ok(TentativeRejectType)
-        } else {
-            Err(de::Error::custom("Type not TentativeReject"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for TentativeRejectType {
-    fn deserialize<D>(deserializer: D) -> Result<TentativeRejectType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(TentativeRejectTypeVisitor)
-    }
-}

src/activity/kind/travel.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct TravelType;
-
-impl Serialize for TravelType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Travel")
-    }
-}
-
-pub struct TravelTypeVisitor;
-
-impl<'de> Visitor<'de> for TravelTypeVisitor {
-    type Value = TravelType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Travel'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Travel" {
-            Ok(TravelType)
-        } else {
-            Err(de::Error::custom("Type not Travel"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for TravelType {
-    fn deserialize<D>(deserializer: D) -> Result<TravelType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(TravelTypeVisitor)
-    }
-}

src/activity/kind/undo.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct UndoType;
-
-impl Serialize for UndoType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Undo")
-    }
-}
-
-pub struct UndoTypeVisitor;
-
-impl<'de> Visitor<'de> for UndoTypeVisitor {
-    type Value = UndoType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Undo'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Undo" {
-            Ok(UndoType)
-        } else {
-            Err(de::Error::custom("Type not Undo"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for UndoType {
-    fn deserialize<D>(deserializer: D) -> Result<UndoType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(UndoTypeVisitor)
-    }
-}

src/activity/kind/update.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct UpdateType;
-
-impl Serialize for UpdateType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Update")
-    }
-}
-
-pub struct UpdateTypeVisitor;
-
-impl<'de> Visitor<'de> for UpdateTypeVisitor {
-    type Value = UpdateType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Update'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Update" {
-            Ok(UpdateType)
-        } else {
-            Err(de::Error::custom("Type not update"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for UpdateType {
-    fn deserialize<D>(deserializer: D) -> Result<UpdateType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(UpdateTypeVisitor)
-    }
-}

src/activity/kind/view.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct ViewType;
-
-impl Serialize for ViewType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("View")
-    }
-}
-
-pub struct ViewTypeVisitor;
-
-impl<'de> Visitor<'de> for ViewTypeVisitor {
-    type Value = ViewType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'View'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "View" {
-            Ok(ViewType)
-        } else {
-            Err(de::Error::custom("Type not View"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for ViewType {
-    fn deserialize<D>(deserializer: D) -> Result<ViewType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(ViewTypeVisitor)
-    }
-}

src/activity/leave.rs

@@ -2,48 +2,29 @@ use serde_json;
 
 use super::{kind::LeaveType, properties::ActivityProperties, Activity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
+use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Leave {
     #[serde(rename = "type")]
     kind: LeaveType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl Leave {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn objects<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-}
-
 impl Object for Leave {}
 impl Activity for Leave {}

src/activity/like.rs

@@ -2,48 +2,29 @@ use serde_json;
 
 use super::{kind::LikeType, properties::ActivityProperties, Activity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
+use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Like {
     #[serde(rename = "type")]
     kind: LikeType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl Like {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn objects<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-}
-
 impl Object for Like {}
 impl Activity for Like {}

src/activity/listen.rs

@@ -2,48 +2,29 @@ use serde_json;
 
 use super::{kind::ListenType, properties::ActivityProperties, Activity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
+use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Listen {
     #[serde(rename = "type")]
     kind: ListenType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl Listen {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn objects<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-}
-
 impl Object for Listen {}
 impl Activity for Listen {}

src/activity/offer.rs

@@ -2,69 +2,33 @@ use serde_json;
 
 use super::{kind::OfferType, properties::ActivityProperties, Activity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
 use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Offer {
     #[serde(rename = "type")]
     kind: OfferType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Object, Link))]
     target: Option<serde_json::Value>,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl Properties for Offer {}
-
-impl Offer {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn objects<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn target<O: Object>(&self) -> Result<O> {
-        self.get_item(|d| &d.target)
-    }
-
-    pub fn targets<O: Object>(&self) -> Result<O> {
-        self.get_item(|d| &d.target)
-    }
-
-    pub fn target_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|d| &d.target)
-    }
-
-    pub fn target_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|d| &d.target)
-    }
-}
-
 impl Object for Offer {}
 impl Activity for Offer {}

src/activity/properties.rs

@@ -5,47 +5,14 @@ use link::Link;
 use object::Object;
 use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct ActivityProperties {
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Object, Link))]
     result: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Object, Link))]
     instrument: Option<serde_json::Value>,
 }
-
-impl Properties for ActivityProperties {}
-
-impl ActivityProperties {
-    pub fn result<O: Object>(&self) -> Result<O> {
-        self.get_item(|ap| &ap.result)
-    }
-
-    pub fn results<O: Object>(&self) -> Result<Vec<O>> {
-        self.get_item(|ap| &ap.result)
-    }
-
-    pub fn result_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|ap| &ap.result)
-    }
-
-    pub fn result_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|ap| &ap.result)
-    }
-
-    pub fn instrument<O: Object>(&self) -> Result<O> {
-        self.get_item(|ap| &ap.instrument)
-    }
-
-    pub fn instruments<O: Object>(&self) -> Result<Vec<O>> {
-        self.get_item(|ap| &ap.instrument)
-    }
-
-    pub fn instrument_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|ap| &ap.instrument)
-    }
-
-    pub fn instrument_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|ap| &ap.instrument)
-    }
-}

src/activity/question.rs

@@ -1,66 +1,33 @@
-use serde::de::DeserializeOwned;
 use serde_json;
 
 use super::{kind::QuestionType, properties::ActivityProperties, Activity, IntransitiveActivity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
 use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Question {
     #[serde(rename = "type")]
     kind: QuestionType,
-    #[serde(skip_serializing_if = "Option::is_none")]
-    one_of: Option<Vec<serde_json::Value>>,
-    #[serde(skip_serializing_if = "Option::is_none")]
-    any_of: Option<Vec<serde_json::Value>>,
+
+    #[serde(skip_serializing_if = "Vec::is_empty", default = "Vec::new")]
+    #[activitystreams(ab(Object, Link))]
+    one_of: Vec<serde_json::Value>,
+
+    #[serde(skip_serializing_if = "Vec::is_empty", default = "Vec::new")]
+    #[activitystreams(ab(Object, Link))]
+    any_of: Vec<serde_json::Value>,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl Properties for Question {}
-
-impl Question {
-    pub fn one_of<O: Object>(&self) -> Result<Vec<O>> {
-        vec_item(&self.one_of)
-    }
-
-    pub fn one_of_link<L: Link>(&self) -> Result<Vec<L>> {
-        vec_item(&self.one_of)
-    }
-
-    pub fn any_of<O: Object>(&self) -> Result<Vec<O>> {
-        vec_item(&self.any_of)
-    }
-
-    pub fn any_of_link<L: Link>(&self) -> Result<Vec<L>> {
-        vec_item(&self.any_of)
-    }
-}
-fn vec_item<D: DeserializeOwned>(v: &Option<Vec<serde_json::Value>>) -> Result<Vec<D>> {
-    if let Some(v) = v.clone() {
-        v.into_iter()
-            .map(|value| serde_json::from_value(value))
-            .fold(Ok(Vec::new()), |acc, item| match acc {
-                Ok(mut v) => match item {
-                    Ok(item) => {
-                        v.push(item);
-                        Ok(v)
-                    }
-                    Err(_) => Err(Error::Deserialize),
-                },
-                Err(e) => Err(e),
-            })
-    } else {
-        Err(Error::NotFound)
-    }
-}
-
 impl Object for Question {}
 impl Activity for Question {}
 impl IntransitiveActivity for Question {}

src/activity/read.rs

@@ -2,48 +2,29 @@ use serde_json;
 
 use super::{kind::ReadType, properties::ActivityProperties, Activity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
+use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Read {
     #[serde(rename = "type")]
     kind: ReadType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl Read {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn objects<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-}
-
 impl Object for Read {}
 impl Activity for Read {}

src/activity/reject.rs

@@ -2,48 +2,29 @@ use serde_json;
 
 use super::{kind::RejectType, properties::ActivityProperties, Activity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
+use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Reject {
     #[serde(rename = "type")]
     kind: RejectType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl Reject {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn objects<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-}
-
 impl Object for Reject {}
 impl Activity for Reject {}

src/activity/remove.rs

@@ -2,87 +2,37 @@ use serde_json;
 
 use super::{kind::RemoveType, properties::ActivityProperties, Activity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
 use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Remove {
     #[serde(rename = "type")]
     kind: RemoveType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Object, Link))]
     origin: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Object, Link))]
     target: Option<serde_json::Value>,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl Properties for Remove {}
-
-impl Remove {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn objects<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn origin<O: Object>(&self) -> Result<O> {
-        self.get_item(|d| &d.origin)
-    }
-
-    pub fn origins<O: Object>(&self) -> Result<O> {
-        self.get_item(|d| &d.origin)
-    }
-
-    pub fn origin_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|d| &d.origin)
-    }
-
-    pub fn origin_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|d| &d.origin)
-    }
-
-    pub fn target<O: Object>(&self) -> Result<O> {
-        self.get_item(|d| &d.target)
-    }
-
-    pub fn targets<O: Object>(&self) -> Result<O> {
-        self.get_item(|d| &d.target)
-    }
-
-    pub fn target_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|d| &d.target)
-    }
-
-    pub fn target_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|d| &d.target)
-    }
-}
-
 impl Object for Remove {}
 impl Activity for Remove {}

src/activity/tentative_accept.rs

@@ -2,48 +2,29 @@ use serde_json;
 
 use super::{kind::TentativeAcceptType, properties::ActivityProperties, Activity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
+use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct TentativeAccept {
     #[serde(rename = "type")]
     kind: TentativeAcceptType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl TentativeAccept {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn objects<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-}
-
 impl Object for TentativeAccept {}
 impl Activity for TentativeAccept {}

src/activity/tentative_reject.rs

@@ -2,48 +2,29 @@ use serde_json;
 
 use super::{kind::TentativeRejectType, properties::ActivityProperties, Activity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
+use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct TentativeReject {
     #[serde(rename = "type")]
     kind: TentativeRejectType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl TentativeReject {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn objects<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-}
-
 impl Object for TentativeReject {}
 impl Activity for TentativeReject {}

src/activity/travel.rs

@@ -2,79 +2,35 @@ use serde_json;
 
 use super::{kind::TravelType, properties::ActivityProperties, Activity, IntransitiveActivity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
 use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Travel {
     #[serde(rename = "type")]
     kind: TravelType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Object, Link))]
     origin: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Object, Link))]
     target: Option<serde_json::Value>,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl Properties for Travel {}
-
-impl Travel {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn origin<O: Object>(&self) -> Result<O> {
-        self.get_item(|d| &d.origin)
-    }
-
-    pub fn origins<O: Object>(&self) -> Result<O> {
-        self.get_item(|d| &d.origin)
-    }
-
-    pub fn origin_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|d| &d.origin)
-    }
-
-    pub fn origin_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|d| &d.origin)
-    }
-
-    pub fn target<O: Object>(&self) -> Result<O> {
-        self.get_item(|d| &d.target)
-    }
-
-    pub fn targets<O: Object>(&self) -> Result<O> {
-        self.get_item(|d| &d.target)
-    }
-
-    pub fn target_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|d| &d.target)
-    }
-
-    pub fn target_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|d| &d.target)
-    }
-}
-
 impl Object for Travel {}
 impl Activity for Travel {}
 impl IntransitiveActivity for Travel {}

src/activity/undo.rs

@@ -2,48 +2,29 @@ use serde_json;
 
 use super::{kind::UndoType, properties::ActivityProperties, Activity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
+use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Undo {
     #[serde(rename = "type")]
     kind: UndoType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl Undo {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn objects<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-}
-
 impl Object for Undo {}
 impl Activity for Undo {}

src/activity/update.rs

@@ -2,48 +2,29 @@ use serde_json;
 
 use super::{kind::UpdateType, properties::ActivityProperties, Activity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
+use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Update {
     #[serde(rename = "type")]
     kind: UpdateType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl Update {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn objects<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-}
-
 impl Object for Update {}
 impl Activity for Update {}

src/activity/view.rs

@@ -2,48 +2,29 @@ use serde_json;
 
 use super::{kind::ViewType, properties::ActivityProperties, Activity};
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
 use object::{Object, ObjectProperties};
+use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct View {
     #[serde(rename = "type")]
     kind: ViewType,
+
+    #[activitystreams(ab(Object, Link))]
     actor: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub activity_props: ActivityProperties,
 }
 
-impl View {
-    pub fn actor<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actors<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn actor_links<L: Link>(&self) -> Result<Vec<L>> {
-        serde_json::from_value(self.actor.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn objects<O: Object>(&self) -> Result<Vec<O>> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-}
-
 impl Object for View {}
 impl Activity for View {}

src/actor/kind.rs

@@ -0,0 +1,25 @@
+use std::fmt;
+
+use serde::{
+    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
+};
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Application)]
+pub struct ApplicationType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Group)]
+pub struct GroupType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Organization)]
+pub struct OrganizationType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Person)]
+pub struct PersonType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Service)]
+pub struct ServiceType;

src/actor/kind/application.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct ApplicationType;
-
-impl Serialize for ApplicationType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Application")
-    }
-}
-
-pub struct ApplicationTypeVisitor;
-
-impl<'de> Visitor<'de> for ApplicationTypeVisitor {
-    type Value = ApplicationType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Application'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Application" {
-            Ok(ApplicationType)
-        } else {
-            Err(de::Error::custom("Type not Application"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for ApplicationType {
-    fn deserialize<D>(deserializer: D) -> Result<ApplicationType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(ApplicationTypeVisitor)
-    }
-}

src/actor/kind/group.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct GroupType;
-
-impl Serialize for GroupType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Group")
-    }
-}
-
-pub struct GroupTypeVisitor;
-
-impl<'de> Visitor<'de> for GroupTypeVisitor {
-    type Value = GroupType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Group'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Group" {
-            Ok(GroupType)
-        } else {
-            Err(de::Error::custom("Type not Group"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for GroupType {
-    fn deserialize<D>(deserializer: D) -> Result<GroupType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(GroupTypeVisitor)
-    }
-}

src/actor/kind/mod.rs

@@ -1,11 +0,0 @@
-mod application;
-mod group;
-mod organization;
-mod person;
-mod service;
-
-pub use self::application::*;
-pub use self::group::*;
-pub use self::organization::*;
-pub use self::person::*;
-pub use self::service::*;

src/actor/kind/organization.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct OrganizationType;
-
-impl Serialize for OrganizationType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Organization")
-    }
-}
-
-pub struct OrganizationTypeVisitor;
-
-impl<'de> Visitor<'de> for OrganizationTypeVisitor {
-    type Value = OrganizationType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Organization'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Organization" {
-            Ok(OrganizationType)
-        } else {
-            Err(de::Error::custom("Type not Organization"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for OrganizationType {
-    fn deserialize<D>(deserializer: D) -> Result<OrganizationType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(OrganizationTypeVisitor)
-    }
-}

src/actor/kind/person.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct PersonType;
-
-impl Serialize for PersonType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Person")
-    }
-}
-
-pub struct PersonTypeVisitor;
-
-impl<'de> Visitor<'de> for PersonTypeVisitor {
-    type Value = PersonType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Person'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Person" {
-            Ok(PersonType)
-        } else {
-            Err(de::Error::custom("Type not Person"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for PersonType {
-    fn deserialize<D>(deserializer: D) -> Result<PersonType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(PersonTypeVisitor)
-    }
-}

src/actor/kind/service.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct ServiceType;
-
-impl Serialize for ServiceType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Service")
-    }
-}
-
-pub struct ServiceTypeVisitor;
-
-impl<'de> Visitor<'de> for ServiceTypeVisitor {
-    type Value = ServiceType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Service'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Service" {
-            Ok(ServiceType)
-        } else {
-            Err(de::Error::custom("Type not Service"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for ServiceType {
-    fn deserialize<D>(deserializer: D) -> Result<ServiceType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(ServiceTypeVisitor)
-    }
-}

src/actor/mod.rs

@@ -10,6 +10,7 @@ pub trait Actor: Object {}
 pub struct Appliation {
     #[serde(rename = "type")]
     kind: ApplicationType,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
 }
@@ -21,6 +22,7 @@ impl Object for Appliation {}
 pub struct Group {
     #[serde(rename = "type")]
     kind: GroupType,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
 }
@@ -32,6 +34,7 @@ impl Object for Group {}
 pub struct Organization {
     #[serde(rename = "type")]
     kind: OrganizationType,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
 }
@@ -43,6 +46,7 @@ impl Object for Organization {}
 pub struct Person {
     #[serde(rename = "type")]
     kind: PersonType,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
 }
@@ -54,6 +58,7 @@ impl Object for Person {}
 pub struct Service {
     #[serde(rename = "type")]
     kind: ServiceType,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
 }

src/base.rs

@@ -1,3 +0,0 @@
-use serde::{de::DeserializeOwned, ser::Serialize};
-
-pub trait Base: Serialize + DeserializeOwned {}

src/collection/kind.rs

@@ -0,0 +1,21 @@
+use std::fmt;
+
+use serde::{
+    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
+};
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Collection)]
+pub struct CollectionType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(CollectionPage)]
+pub struct CollectionPageType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(OrderedCollection)]
+pub struct OrderedCollectionType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(OrderedCollectionPage)]
+pub struct OrderedCollectionPageType;

src/collection/kind/collection.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct CollectionType;
-
-impl Serialize for CollectionType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Collection")
-    }
-}
-
-pub struct CollectionTypeVisitor;
-
-impl<'de> Visitor<'de> for CollectionTypeVisitor {
-    type Value = CollectionType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Collection'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Collection" {
-            Ok(CollectionType)
-        } else {
-            Err(de::Error::custom("Type not Collection"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for CollectionType {
-    fn deserialize<D>(deserializer: D) -> Result<CollectionType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(CollectionTypeVisitor)
-    }
-}

src/collection/kind/collection_page.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct CollectionPageType;
-
-impl Serialize for CollectionPageType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("CollectionPage")
-    }
-}
-
-pub struct CollectionPageTypeVisitor;
-
-impl<'de> Visitor<'de> for CollectionPageTypeVisitor {
-    type Value = CollectionPageType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'CollectionPage'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "CollectionPage" {
-            Ok(CollectionPageType)
-        } else {
-            Err(de::Error::custom("Type not CollectionPage"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for CollectionPageType {
-    fn deserialize<D>(deserializer: D) -> Result<CollectionPageType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(CollectionPageTypeVisitor)
-    }
-}

src/collection/kind/mod.rs

@@ -1,9 +0,0 @@
-mod collection;
-mod collection_page;
-mod ordered_collection;
-mod ordered_collection_page;
-
-pub use self::collection::*;
-pub use self::collection_page::*;
-pub use self::ordered_collection::*;
-pub use self::ordered_collection_page::*;

src/collection/kind/ordered_collection.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct OrderedCollectionType;
-
-impl Serialize for OrderedCollectionType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("OrderedCollection")
-    }
-}
-
-pub struct OrderedCollectionTypeVisitor;
-
-impl<'de> Visitor<'de> for OrderedCollectionTypeVisitor {
-    type Value = OrderedCollectionType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'OrderedCollection'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "OrderedCollection" {
-            Ok(OrderedCollectionType)
-        } else {
-            Err(de::Error::custom("Type not OrderedCollection"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for OrderedCollectionType {
-    fn deserialize<D>(deserializer: D) -> Result<OrderedCollectionType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(OrderedCollectionTypeVisitor)
-    }
-}

src/collection/kind/ordered_collection_page.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct OrderedCollectionPageType;
-
-impl Serialize for OrderedCollectionPageType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("OrderedCollectionPage")
-    }
-}
-
-pub struct OrderedCollectionPageTypeVisitor;
-
-impl<'de> Visitor<'de> for OrderedCollectionPageTypeVisitor {
-    type Value = OrderedCollectionPageType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'OrderedCollectionPage'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "OrderedCollectionPage" {
-            Ok(OrderedCollectionPageType)
-        } else {
-            Err(de::Error::custom("Type not OrderedCollectionPage"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for OrderedCollectionPageType {
-    fn deserialize<D>(deserializer: D) -> Result<OrderedCollectionPageType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(OrderedCollectionPageTypeVisitor)
-    }
-}

src/collection/mod.rs

@@ -1,68 +1,78 @@
 use serde_json;
 
+use error::Result;
+use link::Link;
 use object::Object;
 
 mod kind;
 mod properties;
 pub use self::kind::*;
 pub use self::properties::*;
+use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Collection {
-    #[serde(rename = "@context")]
-    context: serde_json::Value,
     #[serde(rename = "type")]
     kind: CollectionType,
+
+    #[activitystreams(ab(Object, Link))]
     items: Vec<serde_json::Value>,
+
     #[serde(flatten)]
     pub collection_props: CollectionProperties,
 }
 
 impl Object for Collection {}
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct OrderedCollection {
-    #[serde(rename = "@context")]
-    context: serde_json::Value,
     #[serde(rename = "type")]
     kind: OrderedCollectionType,
+
+    #[activitystreams(ab(Object, Link))]
     items: Vec<serde_json::Value>,
+
     #[serde(flatten)]
     pub collection_props: CollectionProperties,
 }
 
 impl Object for OrderedCollection {}
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct CollectionPage {
-    #[serde(rename = "@context")]
-    context: serde_json::Value,
     #[serde(rename = "type")]
     kind: CollectionPageType,
+
+    #[activitystreams(ab(Object, Link))]
     items: Vec<serde_json::Value>,
+
     #[serde(flatten)]
     pub collection_props: CollectionProperties,
+
     #[serde(flatten)]
     pub collection_page_props: CollectionPageProperties,
 }
 
 impl Object for CollectionPage {}
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct OrderedCollectionPage {
-    #[serde(rename = "@context")]
-    context: serde_json::Value,
     #[serde(rename = "type")]
     kind: OrderedCollectionPageType,
+
+    #[activitystreams(ab(Object, Link))]
     items: Vec<serde_json::Value>,
+
     #[serde(flatten)]
     pub collection_props: CollectionProperties,
+
     #[serde(flatten)]
     pub collection_page_props: CollectionPageProperties,
+
     #[serde(flatten)]
     pub ordered_collection_page_props: OrderedCollectionPageProperties,
 }

src/collection/properties.rs

@@ -5,101 +5,46 @@ use error::Result;
 use link::Link;
 use Properties;
 
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct CollectionProperties {
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(u64), functional)]
     total_items: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(CollectionPage), ab(Link), functional)]
     current: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(CollectionPage), ab(Link), functional)]
     first: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(CollectionPage), ab(Link), functional)]
     last: Option<serde_json::Value>,
 }
 
-impl Properties for CollectionProperties {}
-
-impl CollectionProperties {
-    pub fn total_items(&self) -> Result<u64> {
-        self.get_item(|c| &c.total_items)
-    }
-
-    pub fn current(&self) -> Result<CollectionPage> {
-        self.get_item(|c| &c.current)
-    }
-
-    pub fn current_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|c| &c.current)
-    }
-
-    pub fn first(&self) -> Result<CollectionPage> {
-        self.get_item(|c| &c.first)
-    }
-
-    pub fn first_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|c| &c.first)
-    }
-
-    pub fn last(&self) -> Result<CollectionPage> {
-        self.get_item(|c| &c.last)
-    }
-
-    pub fn last_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|c| &c.last)
-    }
-}
-
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct CollectionPageProperties {
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(Collection), ab(Link), functional)]
     part_of: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(CollectionPage), ab(Link), functional)]
     next: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(CollectionPage), ab(Link), functional)]
     prev: Option<serde_json::Value>,
 }
 
-impl Properties for CollectionPageProperties {}
-
-impl CollectionPageProperties {
-    pub fn part_of(&self) -> Result<Collection> {
-        self.get_item(|c| &c.part_of)
-    }
-
-    pub fn part_of_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|c| &c.part_of)
-    }
-
-    pub fn next(&self) -> Result<CollectionPage> {
-        self.get_item(|c| &c.next)
-    }
-
-    pub fn next_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|c| &c.next)
-    }
-
-    pub fn prev(&self) -> Result<CollectionPage> {
-        self.get_item(|c| &c.prev)
-    }
-
-    pub fn prev_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|c| &c.prev)
-    }
-}
-
-#[derive(Clone, Debug, Deserialize, Serialize)]
+#[derive(Clone, Debug, Deserialize, Serialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct OrderedCollectionPageProperties {
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(u64), functional)]
     start_index: Option<serde_json::Value>,
 }
-
-impl Properties for OrderedCollectionPageProperties {}
-
-impl OrderedCollectionPageProperties {
-    pub fn start_index(&self) -> Result<u64> {
-        self.get_item(|c| &c.start_index)
-    }
-}

src/lib.rs

@@ -1,4 +1,6 @@
 #[macro_use]
+extern crate activitystreams_derive;
+#[macro_use]
 extern crate failure;
 extern crate mime;
 extern crate serde;
@@ -14,6 +16,14 @@ pub fn context() -> serde_json::Value {
 }
 
 pub trait Properties {
+    fn get_value<F, I>(&self, f: F) -> error::Result<I>
+    where
+        F: FnOnce(&Self) -> &serde_json::Value,
+        I: serde::de::DeserializeOwned,
+    {
+        serde_json::from_value(f(self).clone()).map_err(|_| error::Error::Deserialize)
+    }
+
     fn get_item<F, I>(&self, f: F) -> error::Result<I>
     where
         F: FnOnce(&Self) -> &Option<serde_json::Value>,
@@ -25,11 +35,29 @@ pub trait Properties {
             Err(error::Error::NotFound)
         }
     }
+
+    fn get_vec<F, I>(&self, f: F) -> error::Result<Vec<I>>
+    where
+        F: FnOnce(&Self) -> &Vec<serde_json::Value>,
+        I: serde::de::DeserializeOwned,
+    {
+        let item = f(self);
+
+        item.iter().fold(Ok(Vec::new()), |acc, item| match acc {
+            Ok(mut acc) => match serde_json::from_value(item.clone()) {
+                Ok(item) => {
+                    acc.push(item);
+                    Ok(acc)
+                }
+                Err(_) => Err(error::Error::Deserialize),
+            },
+            Err(e) => Err(e),
+        })
+    }
 }
 
 pub mod activity;
 pub mod actor;
-pub mod base;
 pub mod collection;
 pub mod error;
 pub mod link;

src/link/kind.rs

@@ -4,44 +4,6 @@ use serde::{
     de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
 };
 
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Mention)]
 pub struct MentionType;
-
-impl Serialize for MentionType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Mention")
-    }
-}
-
-pub struct MentionTypeVisitor;
-
-impl<'de> Visitor<'de> for MentionTypeVisitor {
-    type Value = MentionType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Mention'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Mention" {
-            Ok(MentionType)
-        } else {
-            Err(de::Error::custom("Type not Mention"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for MentionType {
-    fn deserialize<D>(deserializer: D) -> Result<MentionType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(MentionTypeVisitor)
-    }
-}

src/link/mod.rs

@@ -12,6 +12,7 @@ pub trait Link: DeserializeOwned + Serialize {}
 pub struct Mention {
     #[serde(rename = "type")]
     kind: MentionType,
+
     #[serde(flatten)]
     pub link_props: LinkProperties,
 }

src/link/properties.rs

@@ -6,70 +6,50 @@ use link::Link;
 use object::Object;
 use Properties;
 
-#[derive(Clone, Debug, Serialize, Deserialize)]
+#[derive(Clone, Debug, Serialize, Deserialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct LinkProperties {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(String), functional)]
     id: Option<serde_json::Value>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(String), functional)]
     href: Option<serde_json::Value>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(String))]
     rel: Option<serde_json::Value>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(String), functional)]
     media_type: Option<serde_json::Value>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(String))]
     name: Option<serde_json::Value>,
+
+    // TODO: Lang enum
+    #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(String), functional)]
     hreflang: Option<serde_json::Value>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(u64), functional)]
     height: Option<serde_json::Value>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(u64), functional)]
     width: Option<serde_json::Value>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Object, Link))]
     preview: Option<serde_json::Value>,
 }
 
-impl Properties for LinkProperties {}
-
 impl LinkProperties {
-    pub fn id(&self) -> Result<String> {
-        self.get_item(|l| &l.id)
-    }
-
-    pub fn href(&self) -> Result<String> {
-        self.get_item(|l| &l.href)
-    }
-
-    pub fn rel(&self) -> Result<String> {
-        self.get_item(|l| &l.rel)
-    }
-
-    pub fn rels(&self) -> Result<Vec<String>> {
-        self.get_item(|l| &l.rel)
-    }
-
     pub fn media_type(&self) -> Result<mime::Mime> {
-        self.get_item::<_, String>(|l| &l.media_type)
+        self.media_type_string()
             .and_then(|s| s.parse().map_err(|_| Error::Deserialize))
     }
-
-    pub fn name(&self) -> Result<String> {
-        self.get_item(|l| &l.name)
-    }
-
-    pub fn names(&self) -> Result<Vec<String>> {
-        self.get_item(|l| &l.name)
-    }
-
-    // TODO: Lang enum
-    pub fn hreflang(&self) -> Result<String> {
-        self.get_item(|l| &l.hreflang)
-    }
-
-    pub fn height(&self) -> Result<u64> {
-        self.get_item(|l| &l.height)
-    }
-
-    pub fn width(&self) -> Result<u64> {
-        self.get_item(|l| &l.width)
-    }
-
-    pub fn preview<O: Object>(&self) -> Result<O> {
-        self.get_item(|l| &l.preview)
-    }
-
-    pub fn preview_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|l| &l.preview)
-    }
 }

src/object/kind.rs

@@ -0,0 +1,53 @@
+use std::fmt;
+
+use serde::{
+    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
+};
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Article)]
+pub struct ArticleType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Audio)]
+pub struct AudioType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Document)]
+pub struct DocumentType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Event)]
+pub struct EventType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Image)]
+pub struct ImageType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Note)]
+pub struct NoteType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Page)]
+pub struct PageType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Place)]
+pub struct PlaceType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Profile)]
+pub struct ProfileType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Relationship)]
+pub struct RelationshipType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Tombstone)]
+pub struct TombstoneType;
+
+#[derive(Clone, Debug, UnitString)]
+#[activitystreams(Video)]
+pub struct VideoType;

src/object/kind/article.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct ArticleType;
-
-impl Serialize for ArticleType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Article")
-    }
-}
-
-pub struct ArticleTypeVisitor;
-
-impl<'de> Visitor<'de> for ArticleTypeVisitor {
-    type Value = ArticleType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Article'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Article" {
-            Ok(ArticleType)
-        } else {
-            Err(de::Error::custom("Type not Article"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for ArticleType {
-    fn deserialize<D>(deserializer: D) -> Result<ArticleType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(ArticleTypeVisitor)
-    }
-}

src/object/kind/audio.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct AudioType;
-
-impl Serialize for AudioType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Audio")
-    }
-}
-
-pub struct AudioTypeVisitor;
-
-impl<'de> Visitor<'de> for AudioTypeVisitor {
-    type Value = AudioType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Audio'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Audio" {
-            Ok(AudioType)
-        } else {
-            Err(de::Error::custom("Type not Audio"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for AudioType {
-    fn deserialize<D>(deserializer: D) -> Result<AudioType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(AudioTypeVisitor)
-    }
-}

src/object/kind/document.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct DocumentType;
-
-impl Serialize for DocumentType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Document")
-    }
-}
-
-pub struct DocumentTypeVisitor;
-
-impl<'de> Visitor<'de> for DocumentTypeVisitor {
-    type Value = DocumentType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Document'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Document" {
-            Ok(DocumentType)
-        } else {
-            Err(de::Error::custom("Type not Document"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for DocumentType {
-    fn deserialize<D>(deserializer: D) -> Result<DocumentType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(DocumentTypeVisitor)
-    }
-}

src/object/kind/event.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct EventType;
-
-impl Serialize for EventType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Event")
-    }
-}
-
-pub struct EventTypeVisitor;
-
-impl<'de> Visitor<'de> for EventTypeVisitor {
-    type Value = EventType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Event'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Event" {
-            Ok(EventType)
-        } else {
-            Err(de::Error::custom("Type not Event"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for EventType {
-    fn deserialize<D>(deserializer: D) -> Result<EventType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(EventTypeVisitor)
-    }
-}

src/object/kind/image.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct ImageType;
-
-impl Serialize for ImageType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Image")
-    }
-}
-
-pub struct ImageTypeVisitor;
-
-impl<'de> Visitor<'de> for ImageTypeVisitor {
-    type Value = ImageType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Image'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Image" {
-            Ok(ImageType)
-        } else {
-            Err(de::Error::custom("Type not Image"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for ImageType {
-    fn deserialize<D>(deserializer: D) -> Result<ImageType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(ImageTypeVisitor)
-    }
-}

src/object/kind/mod.rs

@@ -1,25 +0,0 @@
-mod article;
-mod audio;
-mod document;
-mod event;
-mod image;
-mod note;
-mod page;
-mod place;
-mod profile;
-mod relationship;
-mod tombstone;
-mod video;
-
-pub use self::article::*;
-pub use self::audio::*;
-pub use self::document::*;
-pub use self::event::*;
-pub use self::image::*;
-pub use self::note::*;
-pub use self::page::*;
-pub use self::place::*;
-pub use self::profile::*;
-pub use self::relationship::*;
-pub use self::tombstone::*;
-pub use self::video::*;

src/object/kind/note.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct NoteType;
-
-impl Serialize for NoteType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Note")
-    }
-}
-
-pub struct NoteTypeVisitor;
-
-impl<'de> Visitor<'de> for NoteTypeVisitor {
-    type Value = NoteType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Note'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Note" {
-            Ok(NoteType)
-        } else {
-            Err(de::Error::custom("Type not Note"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for NoteType {
-    fn deserialize<D>(deserializer: D) -> Result<NoteType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(NoteTypeVisitor)
-    }
-}

src/object/kind/page.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct PageType;
-
-impl Serialize for PageType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Page")
-    }
-}
-
-pub struct PageTypeVisitor;
-
-impl<'de> Visitor<'de> for PageTypeVisitor {
-    type Value = PageType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Page'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Page" {
-            Ok(PageType)
-        } else {
-            Err(de::Error::custom("Type not Page"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for PageType {
-    fn deserialize<D>(deserializer: D) -> Result<PageType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(PageTypeVisitor)
-    }
-}

src/object/kind/place.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct PlaceType;
-
-impl Serialize for PlaceType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Place")
-    }
-}
-
-pub struct PlaceTypeVisitor;
-
-impl<'de> Visitor<'de> for PlaceTypeVisitor {
-    type Value = PlaceType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Place'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Place" {
-            Ok(PlaceType)
-        } else {
-            Err(de::Error::custom("Type not Place"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for PlaceType {
-    fn deserialize<D>(deserializer: D) -> Result<PlaceType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(PlaceTypeVisitor)
-    }
-}

src/object/kind/profile.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct ProfileType;
-
-impl Serialize for ProfileType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Profile")
-    }
-}
-
-pub struct ProfileTypeVisitor;
-
-impl<'de> Visitor<'de> for ProfileTypeVisitor {
-    type Value = ProfileType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Profile'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Profile" {
-            Ok(ProfileType)
-        } else {
-            Err(de::Error::custom("Type not Profile"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for ProfileType {
-    fn deserialize<D>(deserializer: D) -> Result<ProfileType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(ProfileTypeVisitor)
-    }
-}

src/object/kind/relationship.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct RelationshipType;
-
-impl Serialize for RelationshipType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Relationship")
-    }
-}
-
-pub struct RelationshipTypeVisitor;
-
-impl<'de> Visitor<'de> for RelationshipTypeVisitor {
-    type Value = RelationshipType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Relationship'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Relationship" {
-            Ok(RelationshipType)
-        } else {
-            Err(de::Error::custom("Type not Relationship"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for RelationshipType {
-    fn deserialize<D>(deserializer: D) -> Result<RelationshipType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(RelationshipTypeVisitor)
-    }
-}

src/object/kind/tombstone.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct TombstoneType;
-
-impl Serialize for TombstoneType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Tombstone")
-    }
-}
-
-pub struct TombstoneTypeVisitor;
-
-impl<'de> Visitor<'de> for TombstoneTypeVisitor {
-    type Value = TombstoneType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Tombstone'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Tombstone" {
-            Ok(TombstoneType)
-        } else {
-            Err(de::Error::custom("Type not Tombstone"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for TombstoneType {
-    fn deserialize<D>(deserializer: D) -> Result<TombstoneType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(TombstoneTypeVisitor)
-    }
-}

src/object/kind/video.rs

@@ -1,47 +0,0 @@
-use std::fmt;
-
-use serde::{
-    de::{self, Deserialize, Deserializer, Visitor}, ser::{Serialize, Serializer},
-};
-
-#[derive(Clone, Debug)]
-pub struct VideoType;
-
-impl Serialize for VideoType {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        serializer.serialize_str("Video")
-    }
-}
-
-pub struct VideoTypeVisitor;
-
-impl<'de> Visitor<'de> for VideoTypeVisitor {
-    type Value = VideoType;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "The string 'Video'")
-    }
-
-    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-    where
-        E: de::Error,
-    {
-        if v == "Video" {
-            Ok(VideoType)
-        } else {
-            Err(de::Error::custom("Type not Video"))
-        }
-    }
-}
-
-impl<'de> Deserialize<'de> for VideoType {
-    fn deserialize<D>(deserializer: D) -> Result<VideoType, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_str(VideoTypeVisitor)
-    }
-}

src/object/mod.rs

@@ -1,8 +1,9 @@
 use serde::{de::DeserializeOwned, ser::Serialize};
 use serde_json;
 
-use error::{Error, Result};
+use error::Result;
 use link::Link;
+use Properties;
 
 mod kind;
 mod properties;
@@ -16,6 +17,7 @@ pub trait Object: DeserializeOwned + Serialize {}
 pub struct Article {
     #[serde(rename = "type")]
     kind: ArticleType,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
 }
@@ -27,6 +29,7 @@ impl Object for Article {}
 pub struct Audio {
     #[serde(rename = "type")]
     kind: AudioType,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
 }
@@ -38,6 +41,7 @@ impl Object for Audio {}
 pub struct Document {
     #[serde(rename = "type")]
     kind: DocumentType,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
 }
@@ -49,6 +53,7 @@ impl Object for Document {}
 pub struct Event {
     #[serde(rename = "type")]
     kind: EventType,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
 }
@@ -60,6 +65,7 @@ impl Object for Event {}
 pub struct Image {
     #[serde(rename = "type")]
     kind: ImageType,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
 }
@@ -71,6 +77,7 @@ impl Object for Image {}
 pub struct Note {
     #[serde(rename = "type")]
     kind: NoteType,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
 }
@@ -82,6 +89,7 @@ impl Object for Note {}
 pub struct Page {
     #[serde(rename = "type")]
     kind: PageType,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
 }
@@ -93,70 +101,50 @@ impl Object for Page {}
 pub struct Place {
     #[serde(rename = "type")]
     kind: PlaceType,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub place: PlaceProperties,
 }
 
 impl Object for Place {}
 
-#[derive(Clone, Debug, Serialize, Deserialize)]
+#[derive(Clone, Debug, Serialize, Deserialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Profile {
     #[serde(rename = "type")]
     kind: ProfileType,
+
+    #[activitystreams(ab(Object), functional)]
     describes: serde_json::Value,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
 }
 
-impl Profile {
-    pub fn describes<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.describes.clone()).map_err(|_| Error::Deserialize)
-    }
-}
-
 impl Object for Profile {}
 
-#[derive(Clone, Debug, Serialize, Deserialize)]
+#[derive(Clone, Debug, Serialize, Deserialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct Relationship {
     #[serde(rename = "type")]
     kind: RelationshipType,
+
+    #[activitystreams(ab(Object, Link))]
     subject: serde_json::Value,
+
+    #[activitystreams(ab(Object, Link))]
     object: serde_json::Value,
+
+    #[activitystreams(ab(Object))]
     relationship: serde_json::Value,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
 }
 
-impl Relationship {
-    pub fn subject<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.subject.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn relationship<O: Object>(&self) -> Result<O> {
-        serde_json::from_value(self.relationship.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn subject_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.subject.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn object_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.object.clone()).map_err(|_| Error::Deserialize)
-    }
-
-    pub fn relationship_link<L: Link>(&self) -> Result<L> {
-        serde_json::from_value(self.relationship.clone()).map_err(|_| Error::Deserialize)
-    }
-}
-
 impl Object for Relationship {}
 
 #[derive(Clone, Debug, Serialize, Deserialize)]
@@ -164,8 +152,10 @@ impl Object for Relationship {}
 pub struct Tombstone {
     #[serde(rename = "type")]
     kind: TombstoneType,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
+
     #[serde(flatten)]
     pub tombstone_props: TombstoneProperties,
 }
@@ -177,6 +167,7 @@ impl Object for Tombstone {}
 pub struct Video {
     #[serde(rename = "type")]
     kind: VideoType,
+
     #[serde(flatten)]
     pub object_props: ObjectProperties,
 }

src/object/properties.rs

@@ -1,6 +1,5 @@
 use mime;
-use serde::de::DeserializeOwned;
-use serde_json;
+use serde_json::{self, Value};
 
 use collection::Collection;
 use error::{Error, Result};
@@ -8,435 +7,164 @@ use link::Link;
 use object::{Image, Object};
 use Properties;
 
-#[derive(Clone, Debug, Serialize, Deserialize)]
+#[derive(Clone, Debug, Serialize, Deserialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct ObjectProperties {
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(String), functional)]
     id: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Object, Link))]
     attachment: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Object, Link))]
     attributed_to: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Object, Link))]
     audience: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(String))]
     content: Option<serde_json::Value>,
-    #[serde(skip_serializing_if = "Option::is_none")]
-    #[serde(rename = "@context")]
+
+    #[serde(skip_serializing_if = "Option::is_none", rename = "@context")]
+    #[activitystreams(concrete(Value), functional)]
     context: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(String))]
     name: Option<serde_json::Value>,
+
+    // TODO: DateTime<Utc>
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(String), functional)]
     end_time: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Object, Link))]
     generator: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Link), concrete(Image))]
     icon: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Link), concrete(Image))]
     image: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Object, Link))]
     in_reply_to: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Object, Link))]
     location: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Object, Link))]
     preview: Option<serde_json::Value>,
+
+    // TODO: DateTime<Utc>
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(String), functional)]
     published: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(Collection), functional)]
     replies: Option<serde_json::Value>,
+
+    // TODO: DateTime<Utc>
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(String), functional)]
     start_time: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(String))]
     summary: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Object, Link))]
     tag: Option<serde_json::Value>,
+
+    // TODO: DateTime<Utc>
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(String), functional)]
     updated: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(String), ab(Link))]
     url: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Object, Link))]
     to: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Object, Link))]
     bto: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Object, Link))]
     cc: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(ab(Object, Link))]
     bcc: Option<serde_json::Value>,
+
+    // TODO: mime
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(String), functional)]
     media_type: Option<serde_json::Value>,
+
+    // TODO: xsd:duration
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(String), functional)]
     duration: Option<serde_json::Value>,
 }
 
-impl Properties for ObjectProperties {}
-
 impl ObjectProperties {
-    pub fn id<D: DeserializeOwned>(&self) -> Result<D> {
-        self.get_item(|props| &props.id)
-    }
-
-    pub fn attachment<O: Object>(&self) -> Result<O> {
-        self.get_item(|props| &props.attachment)
-    }
-
-    pub fn attachments<O: Object>(&self) -> Result<Vec<O>> {
-        self.get_item(|props| &props.attachment)
-    }
-
-    pub fn attachment_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|props| &props.attachment)
-    }
-
-    pub fn attachment_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|props| &props.attachment)
-    }
-
-    pub fn attributed_to<O: Object>(&self) -> Result<O> {
-        self.get_item(|props| &props.attributed_to)
-    }
-
-    pub fn attributed_tos<O: Object>(&self) -> Result<Vec<O>> {
-        self.get_item(|props| &props.attributed_to)
-    }
-
-    pub fn attributed_to_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|props| &props.attributed_to)
-    }
-
-    pub fn attributed_to_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|props| &props.attributed_to)
-    }
-
-    pub fn audience<O: Object>(&self) -> Result<O> {
-        self.get_item(|props| &props.audience)
-    }
-
-    pub fn audiences<O: Object>(&self) -> Result<Vec<O>> {
-        self.get_item(|props| &props.audience)
-    }
-
-    pub fn audience_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|props| &props.audience)
-    }
-
-    pub fn audience_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|props| &props.audience)
-    }
-
-    pub fn content(&self) -> Result<String> {
-        self.get_item(|props| &props.content)
-    }
-
-    pub fn contents(&self) -> Result<Vec<String>> {
-        self.get_item(|props| &props.content)
-    }
-
-    pub fn context(&self) -> Result<serde_json::Value> {
-        self.context.clone().ok_or(Error::NotFound)
-    }
-
-    pub fn name(&self) -> Result<String> {
-        self.get_item(|props| &props.name)
-    }
-
-    pub fn names(&self) -> Result<Vec<String>> {
-        self.get_item(|props| &props.name)
-    }
-
-    // TODO: DateTime<Utc>
-    pub fn end_time(&self) -> Result<String> {
-        self.get_item(|props| &props.end_time)
-    }
-
-    pub fn generator<O: Object>(&self) -> Result<O> {
-        self.get_item(|props| &props.generator)
-    }
-
-    pub fn generators<O: Object>(&self) -> Result<Vec<O>> {
-        self.get_item(|props| &props.generator)
-    }
-
-    pub fn generator_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|props| &props.generator)
-    }
-
-    pub fn generator_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|props| &props.generator)
-    }
-
-    pub fn icon(&self) -> Result<Image> {
-        self.get_item(|props| &props.icon)
-    }
-
-    pub fn icons(&self) -> Result<Vec<Image>> {
-        self.get_item(|props| &props.icon)
-    }
-
-    pub fn icon_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|props| &props.icon)
-    }
-
-    pub fn icon_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|props| &props.icon)
-    }
-
-    pub fn image(&self) -> Result<Image> {
-        self.get_item(|props| &props.image)
-    }
-
-    pub fn images(&self) -> Result<Vec<Image>> {
-        self.get_item(|props| &props.image)
-    }
-
-    pub fn image_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|props| &props.image)
-    }
-
-    pub fn image_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|props| &props.image)
-    }
-
-    pub fn in_reply_to<O: Object>(&self) -> Result<O> {
-        self.get_item(|props| &props.in_reply_to)
-    }
-
-    pub fn in_reply_tos<O: Object>(&self) -> Result<Vec<O>> {
-        self.get_item(|props| &props.in_reply_to)
-    }
-
-    pub fn in_reply_to_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|props| &props.in_reply_to)
-    }
-
-    pub fn in_reply_to_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|props| &props.in_reply_to)
-    }
-
-    pub fn location<O: Object>(&self) -> Result<O> {
-        self.get_item(|props| &props.location)
-    }
-
-    pub fn locations<O: Object>(&self) -> Result<Vec<O>> {
-        self.get_item(|props| &props.location)
-    }
-
-    pub fn location_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|props| &props.location)
-    }
-
-    pub fn location_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|props| &props.location)
-    }
-
-    pub fn preview<O: Object>(&self) -> Result<O> {
-        self.get_item(|props| &props.preview)
-    }
-
-    pub fn previews<O: Object>(&self) -> Result<Vec<O>> {
-        self.get_item(|props| &props.preview)
-    }
-
-    pub fn preview_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|props| &props.preview)
-    }
-
-    pub fn preview_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|props| &props.preview)
-    }
-
-    // TODO: DateTime<Utc>
-    pub fn published(&self) -> Result<String> {
-        self.get_item(|props| &props.published)
-    }
-
-    pub fn replies(&self) -> Result<Collection> {
-        self.get_item(|props| &props.replies)
-    }
-
-    // TODO: DateTime<Utc>
-    pub fn start_time(&self) -> Result<String> {
-        self.get_item(|props| &props.start_time)
-    }
-
-    pub fn summary(&self) -> Result<String> {
-        self.get_item(|props| &props.summary)
-    }
-
-    pub fn summaries(&self) -> Result<Vec<String>> {
-        self.get_item(|props| &props.summary)
-    }
-
-    pub fn tag<O: Object>(&self) -> Result<O> {
-        self.get_item(|props| &props.tag)
-    }
-
-    pub fn tags<O: Object>(&self) -> Result<Vec<O>> {
-        self.get_item(|props| &props.tag)
-    }
-
-    pub fn tag_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|props| &props.tag)
-    }
-
-    pub fn tag_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|props| &props.tag)
-    }
-
-    // TODO: DateTime<Utc>
-    pub fn updated(&self) -> Result<String> {
-        self.get_item(|props| &props.updated)
-    }
-
-    pub fn url(&self) -> Result<String> {
-        self.get_item(|props| &props.url)
-    }
-
-    pub fn urls(&self) -> Result<Vec<String>> {
-        self.get_item(|props| &props.url)
-    }
-
-    pub fn url_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|props| &props.url)
-    }
-
-    pub fn url_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|props| &props.url)
-    }
-
-    pub fn to<O: Object>(&self) -> Result<O> {
-        self.get_item(|props| &props.to)
-    }
-
-    pub fn tos<O: Object>(&self) -> Result<Vec<O>> {
-        self.get_item(|props| &props.to)
-    }
-
-    pub fn to_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|props| &props.to)
-    }
-
-    pub fn to_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|props| &props.to)
-    }
-
-    pub fn bto<O: Object>(&self) -> Result<O> {
-        self.get_item(|props| &props.bto)
-    }
-
-    pub fn btos<O: Object>(&self) -> Result<Vec<O>> {
-        self.get_item(|props| &props.bto)
-    }
-
-    pub fn bto_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|props| &props.bto)
-    }
-
-    pub fn bto_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|props| &props.bto)
-    }
-
-    pub fn cc<O: Object>(&self) -> Result<O> {
-        self.get_item(|props| &props.cc)
-    }
-
-    pub fn ccs<O: Object>(&self) -> Result<Vec<O>> {
-        self.get_item(|props| &props.cc)
-    }
-
-    pub fn cc_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|props| &props.cc)
-    }
-
-    pub fn cc_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|props| &props.cc)
-    }
-
-    pub fn bcc<O: Object>(&self) -> Result<O> {
-        self.get_item(|props| &props.bcc)
-    }
-
-    pub fn bccs<O: Object>(&self) -> Result<Vec<O>> {
-        self.get_item(|props| &props.bcc)
-    }
-
-    pub fn bcc_link<L: Link>(&self) -> Result<L> {
-        self.get_item(|props| &props.bcc)
-    }
-
-    pub fn bcc_links<L: Link>(&self) -> Result<Vec<L>> {
-        self.get_item(|props| &props.bcc)
-    }
-
     pub fn media_type(&self) -> Result<mime::Mime> {
-        self.get_item::<_, String>(|props| &props.media_type)
+        self.media_type_string()
             .and_then(|s| s.parse().map_err(|_| Error::Deserialize))
     }
-
-    // TODO: xsd:duration
-    pub fn duration(&self) -> Result<String> {
-        self.get_item(|props| &props.duration)
-    }
 }
 
-#[derive(Clone, Debug, Serialize, Deserialize)]
+#[derive(Clone, Debug, Serialize, Deserialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct PlaceProperties {
     #[serde(skip_serializing_if = "Option::is_none")]
-    accuracy: Option<f64>,
+    #[activitystreams(concrete(f64), functional)]
+    accuracy: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
-    altitude: Option<f64>,
+    #[activitystreams(concrete(f64), functional)]
+    altitude: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
-    latitude: Option<f64>,
+    #[activitystreams(concrete(f64), functional)]
+    latitude: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
-    longitude: Option<f64>,
+    #[activitystreams(concrete(f64), functional)]
+    longitude: Option<serde_json::Value>,
+
     #[serde(skip_serializing_if = "Option::is_none")]
-    radius: Option<f64>,
+    #[activitystreams(concrete(f64), functional)]
+    radius: Option<serde_json::Value>,
 }
 
-impl PlaceProperties {
-    pub fn accuracy(&self) -> Result<f64> {
-        self.accuracy.ok_or(Error::NotFound)
-    }
-
-    pub fn altitude(&self) -> Result<f64> {
-        self.altitude.ok_or(Error::NotFound)
-    }
-
-    pub fn latitude(&self) -> Result<f64> {
-        self.latitude.ok_or(Error::NotFound)
-    }
-
-    pub fn longitude(&self) -> Result<f64> {
-        self.longitude.ok_or(Error::NotFound)
-    }
-
-    pub fn radius(&self) -> Result<f64> {
-        self.radius.ok_or(Error::NotFound)
-    }
-}
-
-#[derive(Clone, Debug, Serialize, Deserialize)]
+#[derive(Clone, Debug, Serialize, Deserialize, Properties)]
 #[serde(rename_all = "camelCase")]
 pub struct TombstoneProperties {
     #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(String))]
     former_type: Option<serde_json::Value>,
-    #[serde(skip_serializing_if = "Option::is_none")]
-    deleted: Option<serde_json::Value>,
-}
-
-impl Properties for TombstoneProperties {}
-
-impl TombstoneProperties {
-    pub fn former_type(&self) -> Result<String> {
-        self.get_item(|t| &t.former_type)
-    }
-
-    pub fn former_types(&self) -> Result<Vec<String>> {
-        self.get_item(|t| &t.former_type)
-    }
 
     // TODO: DateTime<Utc>
-    pub fn deleted(&self) -> Result<String> {
-        self.get_item(|t| &t.deleted)
-    }
+    #[serde(skip_serializing_if = "Option::is_none")]
+    #[activitystreams(concrete(String), functional)]
+    deleted: Option<serde_json::Value>,
 }