3 assert_activity_not_local,
4 community_inbox::{community_receive_message, CommunityAcceptedActivities},
6 get_activity_to_and_cc,
7 inbox_verify_http_signature,
8 is_activity_already_known,
9 is_addressed_to_community_followers,
10 is_addressed_to_local_user,
11 user_inbox::{user_receive_message, UserAcceptedActivities},
15 use activitystreams::{activity::ActorAndObject, prelude::*};
16 use actix_web::{web, HttpRequest, HttpResponse};
18 use lemmy_db_queries::{ApubObject, DbPool};
19 use lemmy_db_schema::source::community::Community;
20 use lemmy_structs::blocking;
21 use lemmy_utils::{location_info, LemmyError};
22 use lemmy_websocket::LemmyContext;
23 use serde::{Deserialize, Serialize};
27 /// Allowed activity types for shared inbox.
28 #[derive(Clone, Debug, Eq, Ord, PartialEq, PartialOrd, Deserialize, Serialize)]
29 #[serde(rename_all = "PascalCase")]
41 // TODO: this isnt entirely correct, cause some of these receive are not ActorAndObject,
42 // but it still works due to the anybase conversion
43 pub type AcceptedActivities = ActorAndObject<ValidTypes>;
45 /// Handler for all incoming requests to shared inbox.
46 pub async fn shared_inbox(
48 input: web::Json<AcceptedActivities>,
49 context: web::Data<LemmyContext>,
50 ) -> Result<HttpResponse, LemmyError> {
51 let activity = input.into_inner();
52 // First of all check the http signature
53 let request_counter = &mut 0;
54 let actor = inbox_verify_http_signature(&activity, &context, request, request_counter).await?;
56 // Do nothing if we received the same activity before
57 let actor_id = actor.actor_id();
58 let activity_id = get_activity_id(&activity, &actor_id)?;
59 if is_activity_already_known(context.pool(), &activity_id).await? {
60 return Ok(HttpResponse::Ok().finish());
63 assert_activity_not_local(&activity)?;
64 // Log the activity, so we avoid receiving and parsing it twice. Note that this could still happen
65 // if we receive the same activity twice in very quick succession.
66 insert_activity(&activity_id, activity.clone(), false, true, context.pool()).await?;
68 let activity_any_base = activity.clone().into_any_base()?;
69 let mut res: Option<HttpResponse> = None;
70 let to_and_cc = get_activity_to_and_cc(&activity);
71 // Handle community first, so in case the sender is banned by the community, it will error out.
72 // If we handled the user receive first, the activity would be inserted to the database before the
73 // community could check for bans.
74 // Note that an activity can be addressed to a community and to a user (or multiple users) at the
75 // same time. In this case we still only handle it once, to avoid duplicate websocket
77 let community = extract_local_community_from_destinations(&to_and_cc, context.pool()).await?;
78 if let Some(community) = community {
79 let community_activity = CommunityAcceptedActivities::from_any_base(activity_any_base.clone())?
80 .context(location_info!())?;
82 community_receive_message(
91 } else if is_addressed_to_local_user(&to_and_cc, context.pool()).await? {
92 let user_activity = UserAcceptedActivities::from_any_base(activity_any_base.clone())?
93 .context(location_info!())?;
94 // `to_user` is only used for follow activities (which we dont receive here), so no need to pass
104 } else if is_addressed_to_community_followers(&to_and_cc, context.pool())
108 let user_activity = UserAcceptedActivities::from_any_base(activity_any_base.clone())?
109 .context(location_info!())?;
111 user_receive_message(
122 // If none of those, throw an error
123 if let Some(r) = res {
126 Ok(HttpResponse::NotImplemented().finish())
130 /// If `to_and_cc` contains the ID of a local community, return that community, otherwise return
133 /// This doesnt handle the case where an activity is addressed to multiple communities (because
134 /// Lemmy doesnt generate such activities).
135 async fn extract_local_community_from_destinations(
138 ) -> Result<Option<Community>, LemmyError> {
139 for url in to_and_cc {
140 let url = url.to_owned();
141 let community = blocking(&pool, move |conn| {
142 Community::read_from_apub_id(&conn, &url.into())
145 if let Ok(c) = community {