Create instance actor

src/activitypub/actor.rs

@@ -1,6 +1,7 @@
 use serde::{Deserialize, Serialize};
 use serde_json::{json, Value};
 
+use crate::config::Instance;
 use crate::errors::ConversionError;
 use crate::models::profiles::types::{DbActorProfile, ExtraField};
 use crate::models::users::types::User;
@@ -14,7 +15,7 @@ use super::views::{
     get_followers_url,
     get_following_url,
 };
-use super::vocabulary::{PERSON, IMAGE, PROPERTY_VALUE};
+use super::vocabulary::{IMAGE, PERSON, PROPERTY_VALUE, SERVICE};
 
 const W3ID_CONTEXT: &str = "https://w3id.org/security/v1";
 
@@ -63,8 +64,12 @@ pub struct Actor {
     pub preferred_username: String,
     pub inbox: String,
     pub outbox: String,
-    pub followers: String,
-    pub following: String,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub followers: Option<String>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub following: Option<String>,
 
     pub public_key: PublicKey,
 
@@ -80,6 +85,7 @@ pub struct Actor {
     #[serde(skip_serializing_if = "Option::is_none")]
     pub summary: Option<String>,
 
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub attachment: Option<Vec<ActorProperty>>,
 }
 
@@ -178,8 +184,8 @@ pub fn get_local_actor(
         preferred_username: username.to_string(),
         inbox,
         outbox,
-        followers,
-        following,
+        followers: Some(followers),
+        following: Some(following),
         public_key,
         capabilities: Some(capabilities),
         icon: avatar,
@@ -189,3 +195,38 @@ pub fn get_local_actor(
     };
     Ok(actor)
 }
+
+pub fn get_instance_actor(
+    instance: &Instance,
+) -> Result<Actor, ActorKeyError> {
+    let actor_id = instance.actor_id();
+    let actor_inbox = format!("{}/inbox", actor_id);
+    let actor_outbox = format!("{}/outbox", actor_id);
+    let public_key_pem = get_public_key_pem(&instance.actor_key)?;
+    let public_key = PublicKey {
+        id: instance.actor_key_id(),
+        owner: actor_id.clone(),
+        public_key_pem: public_key_pem,
+    };
+    let actor = Actor {
+        context: Some(json!([
+            AP_CONTEXT.to_string(),
+            W3ID_CONTEXT.to_string(),
+        ])),
+        id: actor_id,
+        object_type: SERVICE.to_string(),
+        name: instance.host(),
+        preferred_username: instance.host(),
+        inbox: actor_inbox,
+        outbox: actor_outbox,
+        followers: None,
+        following: None,
+        public_key,
+        capabilities: None,
+        icon: None,
+        image: None,
+        summary: None,
+        attachment: None,
+    };
+    Ok(actor)
+}

src/activitypub/views.rs

@@ -13,7 +13,7 @@ use crate::http_signatures::verify::verify_http_signature;
 use crate::models::posts::queries::get_thread;
 use crate::models::users::queries::get_user_by_name;
 use super::activity::{create_note, OrderedCollection};
-use super::actor::get_local_actor;
+use super::actor::{get_local_actor, get_instance_actor};
 use super::constants::ACTIVITY_CONTENT_TYPE;
 use super::receiver::receive_activity;
 
@@ -37,6 +37,10 @@ pub fn get_following_url(instance_url: &str, username: &str) -> String {
     format!("{}/users/{}/following", instance_url, username)
 }
 
+pub fn get_instance_actor_url(instance_url: &str) -> String {
+    format!("{}/actor", instance_url)
+}
+
 pub fn get_object_url(instance_url: &str, object_uuid: &Uuid) -> String {
     format!("{}/objects/{}", instance_url, object_uuid)
 }
@@ -55,7 +59,7 @@ fn is_activitypub_request(request: &HttpRequest) -> bool {
 }
 
 #[get("")]
-async fn get_actor(
+async fn actor_view(
     config: web::Data<Config>,
     db_pool: web::Data<Pool>,
     request: HttpRequest,
@@ -135,16 +139,28 @@ async fn following_collection(
     Ok(response)
 }
 
-pub fn activitypub_scope() -> Scope {
+pub fn actor_scope() -> Scope {
     web::scope("/users/{username}")
-        .service(get_actor)
+        .service(actor_view)
         .service(inbox)
         .service(followers_collection)
         .service(following_collection)
 }
 
+#[get("/actor")]
+pub async fn instance_actor_view(
+    config: web::Data<Config>,
+) -> Result<HttpResponse, HttpError> {
+    let actor = get_instance_actor(&config.instance())
+        .map_err(|_| HttpError::InternalError)?;
+    let response = HttpResponse::Ok()
+        .content_type(ACTIVITY_CONTENT_TYPE)
+        .json(actor);
+    Ok(response)
+}
+
 #[get("/objects/{object_id}")]
-pub async fn get_object(
+pub async fn object_view(
     config: web::Data<Config>,
     db_pool: web::Data<Pool>,
     request: HttpRequest,

src/activitypub/vocabulary.rs

@@ -12,6 +12,7 @@ pub const UPDATE: &str = "Update";
 
 // Actor types
 pub const PERSON: &str = "Person";
+pub const SERVICE: &str = "Service";
 
 // Object types
 pub const DOCUMENT: &str = "Document";

src/config.rs

@@ -5,6 +5,7 @@ use rsa::RsaPrivateKey;
 use serde::{de, Deserialize, Deserializer};
 use url::Url;
 
+use crate::activitypub::views::get_instance_actor_url;
 use crate::errors::ConversionError;
 use crate::utils::crypto::deserialize_private_key;
 
@@ -152,6 +153,14 @@ impl Instance {
     pub fn host(&self) -> String {
         self._url.host_str().unwrap().to_string()
     }
+
+    pub fn actor_id(&self) -> String {
+        get_instance_actor_url(&self.url())
+    }
+
+    pub fn actor_key_id(&self) -> String {
+        format!("{}#main-key", self.actor_id())
+    }
 }
 
 pub fn parse_config() -> Config {

src/main.rs

@@ -5,7 +5,7 @@ use actix_web::{
     middleware::Logger as ActixLogger,
 };
 
-use mitra::activitypub::views::{activitypub_scope, get_object};
+use mitra::activitypub::views as activitypub;
 use mitra::config::{Environment, parse_config};
 use mitra::database::create_pool;
 use mitra::database::migrate::apply_migrations;
@@ -87,8 +87,9 @@ async fn main() -> std::io::Result<()> {
             .service(search_api_scope())
             .service(timeline_api_scope())
             .service(webfinger::get_descriptor)
-            .service(activitypub_scope())
-            .service(get_object)
+            .service(activitypub::actor_scope())
+            .service(activitypub::instance_actor_view)
+            .service(activitypub::object_view)
             .service(nodeinfo::get_nodeinfo)
             .service(nodeinfo::get_nodeinfo_2_0);
         if let Some(contract_dir) = &config.ethereum_contract_dir {

src/webfinger/views.rs

@@ -2,7 +2,7 @@ use actix_web::{get, web, HttpResponse};
 use regex::Regex;
 use tokio_postgres::GenericClient;
 
-use crate::activitypub::views::get_actor_url;
+use crate::activitypub::views::{get_actor_url, get_instance_actor_url};
 use crate::activitypub::constants::ACTIVITY_CONTENT_TYPE;
 use crate::config::{Config, Instance};
 use crate::database::{Pool, get_database_client};
@@ -22,7 +22,7 @@ async fn get_user_info(
 ) -> Result<JsonResourceDescriptor, HttpError> {
     // Parse 'acct' URI
     // https://datatracker.ietf.org/doc/html/rfc7565#section-7
-    let uri_regexp = Regex::new(r"acct:(?P<user>\w+)@(?P<instance>.+)").unwrap();
+    let uri_regexp = Regex::new(r"acct:(?P<user>[\w\.]+)@(?P<instance>.+)").unwrap();
     let uri_caps = uri_regexp.captures(&query_params.resource)
         .ok_or(ValidationError("invalid query target"))?;
     let username = uri_caps.name("user")
@@ -36,10 +36,14 @@ async fn get_user_info(
         // Wrong instance
         return Err(HttpError::NotFoundError("user"));
     }
-    if !is_registered_user(db_client, username).await? {
-        return Err(HttpError::NotFoundError("user"));
-    }
-    let actor_url = get_actor_url(&instance.url(), username);
+    let actor_url = if username == instance.host() {
+        get_instance_actor_url(&instance.url())
+    } else {
+        if !is_registered_user(db_client, username).await? {
+            return Err(HttpError::NotFoundError("user"));
+        };
+        get_actor_url(&instance.url(), username)
+    };
     let link = Link {
         rel: "self".to_string(),
         link_type: Some(ACTIVITY_CONTENT_TYPE.to_string()),