crates/apub/src/http/community.rs

   1 use crate::{
   2   activities::{
   3     community::announce::{AnnouncableActivities, AnnounceActivity},
   4     extract_community,
   5     following::{follow::FollowCommunity, undo::UndoFollowCommunity},
   6     report::Report,
   7   },
   8   collections::{
   9     community_moderators::ApubCommunityModerators, community_outbox::ApubCommunityOutbox,
  10     CommunityContext,
  11   },
  12   context::lemmy_context,
  13   fetcher::object_id::ObjectId,
  14   generate_outbox_url,
  15   http::{
  16     create_apub_response, create_apub_tombstone_response, payload_to_string, receive_activity,
  17   },
  18   objects::community::ApubCommunity,
  19 };
  20 use activitystreams::{
  21   base::BaseExt,
  22   collection::{CollectionExt, UnorderedCollection},
  23 };
  24 use actix_web::{body::Body, web, web::Payload, HttpRequest, HttpResponse};
  25 use lemmy_api_common::blocking;
  26 use lemmy_apub_lib::traits::{ActivityFields, ActivityHandler, ApubObject};
  27 use lemmy_db_schema::source::community::Community;
  28 use lemmy_db_views_actor::community_follower_view::CommunityFollowerView;
  29 use lemmy_utils::LemmyError;
  30 use lemmy_websocket::LemmyContext;
  31 use log::trace;
  32 use serde::{Deserialize, Serialize};
  33
  34 #[derive(Deserialize)]
  35 pub(crate) struct CommunityQuery {
  36   community_name: String,
  37 }
  38
  39 /// Return the ActivityPub json representation of a local community over HTTP.
  40 pub(crate) async fn get_apub_community_http(
  41   info: web::Path<CommunityQuery>,
  42   context: web::Data<LemmyContext>,
  43 ) -> Result<HttpResponse<Body>, LemmyError> {
  44   let community: ApubCommunity = blocking(context.pool(), move |conn| {
  45     Community::read_from_name(conn, &info.community_name)
  46   })
  47   .await??
  48   .into();
  49
  50   if !community.deleted {
  51     let apub = community.to_apub(&**context).await?;
  52
  53     Ok(create_apub_response(&apub))
  54   } else {
  55     Ok(create_apub_tombstone_response(&community.to_tombstone()?))
  56   }
  57 }
  58
  59 #[derive(Clone, Debug, Deserialize, Serialize, ActivityHandler, ActivityFields)]
  60 #[serde(untagged)]
  61 #[activity_handler(LemmyContext)]
  62 pub enum GroupInboxActivities {
  63   FollowCommunity(FollowCommunity),
  64   UndoFollowCommunity(UndoFollowCommunity),
  65   AnnouncableActivities(AnnouncableActivities),
  66   Report(Report),
  67 }
  68
  69 /// Handler for all incoming receive to community inboxes.
  70 pub async fn community_inbox(
  71   request: HttpRequest,
  72   payload: Payload,
  73   _path: web::Path<String>,
  74   context: web::Data<LemmyContext>,
  75 ) -> Result<HttpResponse, LemmyError> {
  76   let unparsed = payload_to_string(payload).await?;
  77   trace!("Received community inbox activity {}", unparsed);
  78   let activity = serde_json::from_str::<GroupInboxActivities>(&unparsed)?;
  79
  80   receive_group_inbox(activity.clone(), request, &context).await?;
  81
  82   Ok(HttpResponse::Ok().finish())
  83 }
  84
  85 pub(in crate::http) async fn receive_group_inbox(
  86   activity: GroupInboxActivities,
  87   request: HttpRequest,
  88   context: &LemmyContext,
  89 ) -> Result<HttpResponse, LemmyError> {
  90   let res = receive_activity(request, activity.clone(), context).await;
  91   if let GroupInboxActivities::AnnouncableActivities(announcable) = activity.clone() {
  92     let community = extract_community(&announcable.cc(), context, &mut 0).await?;
  93     if community.local {
  94       AnnounceActivity::send(announcable, &community, vec![], context).await?;
  95     }
  96   }
  97   res
  98 }
  99
 100 /// Returns an empty followers collection, only populating the size (for privacy).
 101 pub(crate) async fn get_apub_community_followers(
 102   info: web::Path<CommunityQuery>,
 103   context: web::Data<LemmyContext>,
 104 ) -> Result<HttpResponse<Body>, LemmyError> {
 105   let community = blocking(context.pool(), move |conn| {
 106     Community::read_from_name(conn, &info.community_name)
 107   })
 108   .await??;
 109
 110   let community_id = community.id;
 111   let community_followers = blocking(context.pool(), move |conn| {
 112     CommunityFollowerView::for_community(conn, community_id)
 113   })
 114   .await??;
 115
 116   let mut collection = UnorderedCollection::new();
 117   collection
 118     .set_many_contexts(lemmy_context())
 119     .set_id(community.followers_url.into())
 120     .set_total_items(community_followers.len() as u64);
 121   Ok(create_apub_response(&collection))
 122 }
 123
 124 /// Returns the community outbox, which is populated by a maximum of 20 posts (but no other
 125 /// activites like votes or comments).
 126 pub(crate) async fn get_apub_community_outbox(
 127   info: web::Path<CommunityQuery>,
 128   context: web::Data<LemmyContext>,
 129 ) -> Result<HttpResponse<Body>, LemmyError> {
 130   let community = blocking(context.pool(), move |conn| {
 131     Community::read_from_name(conn, &info.community_name)
 132   })
 133   .await??;
 134   let id = ObjectId::new(generate_outbox_url(&community.actor_id)?.into_inner());
 135   let outbox_data = CommunityContext(community.into(), context.get_ref().clone());
 136   let outbox: ApubCommunityOutbox = id.dereference(&outbox_data, &mut 0).await?;
 137   Ok(create_apub_response(&outbox.to_apub(&outbox_data).await?))
 138 }
 139
 140 pub(crate) async fn get_apub_community_moderators(
 141   info: web::Path<CommunityQuery>,
 142   context: web::Data<LemmyContext>,
 143 ) -> Result<HttpResponse<Body>, LemmyError> {
 144   let community: ApubCommunity = blocking(context.pool(), move |conn| {
 145     Community::read_from_name(conn, &info.community_name)
 146   })
 147   .await??
 148   .into();
 149   let id = ObjectId::new(generate_outbox_url(&community.actor_id)?.into_inner());
 150   let outbox_data = CommunityContext(community, context.get_ref().clone());
 151   let moderators: ApubCommunityModerators = id.dereference(&outbox_data, &mut 0).await?;
 152   Ok(create_apub_response(
 153     &moderators.to_apub(&outbox_data).await?,
 154   ))
 155 }