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[plume-common]Implement ActivityPub related function using activitystreams 0.7
This commit is contained in:
Kitaiti Makoto
parent
52967f3e47
commit
a21d66178e
1 changed files with 284 additions and 0 deletions
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@ -274,6 +274,84 @@ where
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}
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}
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/// Registers an handler on this Inbox.
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pub fn with07<A, V, M>(self, proxy: Option<&reqwest::Proxy>) -> Self
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where
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A: AsActor<&'a C> + FromId07<C, Error = E>,
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V: activitystreams::markers::Activity + serde::de::DeserializeOwned,
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M: AsObject07<A, V, &'a C, Error = E> + FromId07<C, Error = E>,
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M::Output: Into<R>,
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{
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if let Self::NotHandled(ctx, mut act, e) = self {
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if serde_json::from_value::<V>(act.clone()).is_ok() {
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let act_clone = act.clone();
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let act_id = match act_clone["id"].as_str() {
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Some(x) => x,
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None => return Self::NotHandled(ctx, act, InboxError::InvalidID),
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};
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// Get the actor ID
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let actor_id = match get_id(act["actor"].clone()) {
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Some(x) => x,
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None => return Self::NotHandled(ctx, act, InboxError::InvalidActor(None)),
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};
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if Self::is_spoofed_activity(&actor_id, &act) {
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return Self::NotHandled(ctx, act, InboxError::InvalidObject(None));
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}
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// Transform this actor to a model (see FromId for details about the from_id function)
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let actor = match A::from_id(
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ctx,
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&actor_id,
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serde_json::from_value(act["actor"].clone()).ok(),
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proxy,
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) {
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Ok(a) => a,
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// If the actor was not found, go to the next handler
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Err((json, e)) => {
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if let Some(json) = json {
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act["actor"] = json;
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}
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return Self::NotHandled(ctx, act, InboxError::InvalidActor(Some(e)));
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}
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};
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// Same logic for "object"
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let obj_id = match get_id(act["object"].clone()) {
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Some(x) => x,
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None => return Self::NotHandled(ctx, act, InboxError::InvalidObject(None)),
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};
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let obj = match M::from_id(
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ctx,
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&obj_id,
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serde_json::from_value(act["object"].clone()).ok(),
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proxy,
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) {
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Ok(o) => o,
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Err((json, e)) => {
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if let Some(json) = json {
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act["object"] = json;
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}
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return Self::NotHandled(ctx, act, InboxError::InvalidObject(Some(e)));
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}
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};
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// Handle the activity
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match obj.activity(ctx, actor, act_id) {
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Ok(res) => Self::Handled(res.into()),
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Err(e) => Self::Failed(e),
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}
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} else {
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// If the Activity type is not matching the expected one for
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// this handler, try with the next one.
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Self::NotHandled(ctx, act, e)
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}
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} else {
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self
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}
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}
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/// Transforms the inbox in a `Result`
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pub fn done(self) -> Result<R, E> {
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match self {
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@ -384,6 +462,72 @@ pub trait FromId<C>: Sized {
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fn get_sender() -> &'static dyn Signer;
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}
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/// A trait for ActivityPub objects that can be retrieved or constructed from ID.
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///
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/// The two functions to implement are `from_activity` to create (and save) a new object
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/// of this type from its AP representation, and `from_db` to try to find it in the database
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/// using its ID.
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///
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/// When dealing with the "object" field of incoming activities, `Inbox` will try to see if it is
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/// a full object, and if so, save it with `from_activity`. If it is only an ID, it will try to find
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/// it in the database with `from_db`, and otherwise dereference (fetch) the full object and parse it
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/// with `from_activity`.
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pub trait FromId07<C>: Sized {
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/// The type representing a failure
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type Error: From<InboxError<Self::Error>> + Debug;
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/// The ActivityPub object type representing Self
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type Object: activitystreams::markers::Object + serde::de::DeserializeOwned;
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/// Tries to get an instance of `Self` from an ActivityPub ID.
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///
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/// # Parameters
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///
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/// - `ctx`: a context to get this instance (= a database in which to search)
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/// - `id`: the ActivityPub ID of the object to find
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/// - `object`: optional object that will be used if the object was not found in the database
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/// If absent, the ID will be dereferenced.
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fn from_id(
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ctx: &C,
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id: &str,
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object: Option<Self::Object>,
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proxy: Option<&reqwest::Proxy>,
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) -> Result<Self, (Option<serde_json::Value>, Self::Error)> {
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match Self::from_db(ctx, id) {
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Ok(x) => Ok(x),
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_ => match object {
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Some(o) => Self::from_activity(ctx, o).map_err(|e| (None, e)),
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None => Self::from_activity(ctx, Self::deref(id, proxy.cloned())?)
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.map_err(|e| (None, e)),
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},
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}
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}
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/// Dereferences an ID
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fn deref(
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id: &str,
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proxy: Option<reqwest::Proxy>,
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) -> Result<Self::Object, (Option<serde_json::Value>, Self::Error)> {
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request::get(id, Self::get_sender(), proxy)
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.map_err(|_| (None, InboxError::DerefError))
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.and_then(|mut r| {
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let json: serde_json::Value = r
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.json()
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.map_err(|_| (None, InboxError::InvalidObject(None)))?;
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serde_json::from_value(json.clone())
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.map_err(|_| (Some(json), InboxError::InvalidObject(None)))
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})
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.map_err(|(json, e)| (json, e.into()))
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}
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/// Builds a `Self` from its ActivityPub representation
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fn from_activity(ctx: &C, activity: Self::Object) -> Result<Self, Self::Error>;
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/// Tries to find a `Self` with a given ID (`id`), using `ctx` (a database)
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fn from_db(ctx: &C, id: &str) -> Result<Self, Self::Error>;
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fn get_sender() -> &'static dyn Signer;
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}
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/// Should be implemented by anything representing an ActivityPub actor.
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///
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@ -543,6 +687,146 @@ where
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fn activity(self, ctx: C, actor: A, id: &str) -> Result<Self::Output, Self::Error>;
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}
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/// Should be implemented by anything representing an ActivityPub object.
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///
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/// # Type parameters
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///
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/// - `A`: the actor type
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/// - `V`: the ActivityPub verb/activity
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/// - `O`: the ActivityPub type of the Object for this activity (usually the type corresponding to `Self`)
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/// - `C`: the context needed to handle the activity (usually a database connection)
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///
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/// # Example
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///
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/// An implementation of AsObject that handles Note creation by an Account model,
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/// representing the Note by a Message type, without any specific context.
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///
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/// ```rust
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/// # extern crate activitypub;
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/// # use activitypub::{activity::Create, actor::Person, object::Note};
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/// # use plume_common::activity_pub::inbox::{AsActor, AsObject, FromId};
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/// # use plume_common::activity_pub::sign::{gen_keypair, Error as SignError, Result as SignResult, Signer};
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/// # use openssl::{hash::MessageDigest, pkey::PKey, rsa::Rsa};
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/// # use once_cell::sync::Lazy;
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/// #
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/// # static MY_SIGNER: Lazy<MySigner> = Lazy::new(|| MySigner::new());
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/// #
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/// # struct MySigner {
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/// # public_key: String,
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/// # private_key: String,
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/// # }
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/// #
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/// # impl MySigner {
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/// # fn new() -> Self {
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/// # let (pub_key, priv_key) = gen_keypair();
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/// # Self {
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/// # public_key: String::from_utf8(pub_key).unwrap(),
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/// # private_key: String::from_utf8(priv_key).unwrap(),
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/// # }
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/// # }
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/// # }
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/// #
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/// # impl Signer for MySigner {
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/// # fn get_key_id(&self) -> String {
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/// # "mysigner".into()
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/// # }
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/// #
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/// # fn sign(&self, to_sign: &str) -> SignResult<Vec<u8>> {
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/// # let key = PKey::from_rsa(Rsa::private_key_from_pem(self.private_key.as_ref()).unwrap())
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/// # .unwrap();
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/// # let mut signer = openssl::sign::Signer::new(MessageDigest::sha256(), &key).unwrap();
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/// # signer.update(to_sign.as_bytes()).unwrap();
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/// # signer.sign_to_vec().map_err(|_| SignError())
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/// # }
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/// #
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/// # fn verify(&self, data: &str, signature: &[u8]) -> SignResult<bool> {
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/// # let key = PKey::from_rsa(Rsa::public_key_from_pem(self.public_key.as_ref()).unwrap())
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/// # .unwrap();
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/// # let mut verifier = openssl::sign::Verifier::new(MessageDigest::sha256(), &key).unwrap();
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/// # verifier.update(data.as_bytes()).unwrap();
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/// # verifier.verify(&signature).map_err(|_| SignError())
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/// # }
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/// # }
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/// #
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/// # struct Account;
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/// # impl FromId<()> for Account {
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/// # type Error = ();
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/// # type Object = Person;
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/// #
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/// # fn from_db(_: &(), _id: &str) -> Result<Self, Self::Error> {
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/// # Ok(Account)
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/// # }
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/// #
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/// # fn from_activity(_: &(), obj: Person) -> Result<Self, Self::Error> {
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/// # Ok(Account)
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/// # }
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/// #
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/// # fn get_sender() -> &'static dyn Signer {
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/// # &*MY_SIGNER
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/// # }
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/// # }
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/// # impl AsActor<()> for Account {
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/// # fn get_inbox_url(&self) -> String {
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/// # String::new()
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/// # }
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/// # fn is_local(&self) -> bool { false }
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/// # }
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/// #[derive(Debug)]
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/// struct Message {
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/// text: String,
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/// }
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///
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/// impl FromId<()> for Message {
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/// type Error = ();
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/// type Object = Note;
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///
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/// fn from_db(_: &(), _id: &str) -> Result<Self, Self::Error> {
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/// Ok(Message { text: "From DB".into() })
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/// }
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///
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/// fn from_activity(_: &(), obj: Note) -> Result<Self, Self::Error> {
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/// Ok(Message { text: obj.object_props.content_string().map_err(|_| ())? })
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/// }
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///
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/// fn get_sender() -> &'static dyn Signer {
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/// &*MY_SIGNER
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/// }
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/// }
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///
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/// impl AsObject<Account, Create, ()> for Message {
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/// type Error = ();
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/// type Output = ();
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///
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/// fn activity(self, _: (), _actor: Account, _id: &str) -> Result<(), ()> {
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/// println!("New Note: {:?}", self);
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/// Ok(())
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/// }
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/// }
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/// ```
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pub trait AsObject07<A, V, C>
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where
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V: activitystreams::markers::Activity,
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{
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/// What kind of error is returned when something fails
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type Error;
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/// What is returned by `AsObject::activity`, if anything is returned
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type Output = ();
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/// Handle a specific type of activity dealing with this type of objects.
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///
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/// The implementations should check that the actor is actually authorized
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/// to perform this action.
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///
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/// # Parameters
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///
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/// - `self`: the object on which the activity acts
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/// - `ctx`: the context passed to `Inbox::handle`
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/// - `actor`: the actor who did this activity
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/// - `id`: the ID of this activity
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fn activity(self, ctx: C, actor: A, id: &str) -> Result<Self::Output, Self::Error>;
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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