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,
  10     community_outbox::ApubCommunityOutbox,
  11     CommunityContext,
  12   },
  13   context::lemmy_context,
  14   fetcher::object_id::ObjectId,
  15   generate_outbox_url,
  16   http::{
  17     create_apub_response,
  18     create_apub_tombstone_response,
  19     payload_to_string,
  20     receive_activity,
  21   },
  22   objects::community::ApubCommunity,
  23 };
  24 use activitystreams::{
  25   base::BaseExt,
  26   collection::{CollectionExt, UnorderedCollection},
  27 };
  28 use actix_web::{body::Body, web, web::Payload, HttpRequest, HttpResponse};
  29 use lemmy_api_common::blocking;
  30 use lemmy_apub_lib::traits::{ActivityFields, ActivityHandler, ApubObject};
  31 use lemmy_db_schema::source::community::Community;
  32 use lemmy_db_views_actor::community_follower_view::CommunityFollowerView;
  33 use lemmy_utils::LemmyError;
  34 use lemmy_websocket::LemmyContext;
  35 use log::trace;
  36 use serde::{Deserialize, Serialize};
  37
  38 #[derive(Deserialize)]
  39 pub(crate) struct CommunityQuery {
  40   community_name: String,
  41 }
  42
  43 /// Return the ActivityPub json representation of a local community over HTTP.
  44 pub(crate) async fn get_apub_community_http(
  45   info: web::Path<CommunityQuery>,
  46   context: web::Data<LemmyContext>,
  47 ) -> Result<HttpResponse<Body>, LemmyError> {
  48   let community: ApubCommunity = blocking(context.pool(), move |conn| {
  49     Community::read_from_name(conn, &info.community_name)
  50   })
  51   .await??
  52   .into();
  53
  54   if !community.deleted {
  55     let apub = community.to_apub(&**context).await?;
  56
  57     Ok(create_apub_response(&apub))
  58   } else {
  59     Ok(create_apub_tombstone_response(&community.to_tombstone()?))
  60   }
  61 }
  62
  63 #[derive(Clone, Debug, Deserialize, Serialize, ActivityHandler, ActivityFields)]
  64 #[serde(untagged)]
  65 #[activity_handler(LemmyContext)]
  66 pub enum GroupInboxActivities {
  67   FollowCommunity(FollowCommunity),
  68   UndoFollowCommunity(UndoFollowCommunity),
  69   AnnouncableActivities(AnnouncableActivities),
  70   Report(Report),
  71 }
  72
  73 /// Handler for all incoming receive to community inboxes.
  74 pub async fn community_inbox(
  75   request: HttpRequest,
  76   payload: Payload,
  77   _path: web::Path<String>,
  78   context: web::Data<LemmyContext>,
  79 ) -> Result<HttpResponse, LemmyError> {
  80   let unparsed = payload_to_string(payload).await?;
  81   trace!("Received community inbox activity {}", unparsed);
  82   let activity = serde_json::from_str::<GroupInboxActivities>(&unparsed)?;
  83
  84   receive_group_inbox(activity.clone(), request, &context).await?;
  85
  86   if let GroupInboxActivities::AnnouncableActivities(announcable) = activity {
  87     let community = extract_community(&announcable.cc(), &context, &mut 0).await?;
  88     if community.local {
  89       AnnounceActivity::send(announcable, &community, vec![], &context).await?;
  90     }
  91   }
  92   Ok(HttpResponse::Ok().finish())
  93 }
  94
  95 pub(in crate::http) async fn receive_group_inbox(
  96   activity: GroupInboxActivities,
  97   request: HttpRequest,
  98   context: &LemmyContext,
  99 ) -> Result<HttpResponse, LemmyError> {
 100   receive_activity(request, activity.clone(), context).await
 101 }
 102
 103 /// Returns an empty followers collection, only populating the size (for privacy).
 104 pub(crate) async fn get_apub_community_followers(
 105   info: web::Path<CommunityQuery>,
 106   context: web::Data<LemmyContext>,
 107 ) -> Result<HttpResponse<Body>, LemmyError> {
 108   let community = blocking(context.pool(), move |conn| {
 109     Community::read_from_name(conn, &info.community_name)
 110   })
 111   .await??;
 112
 113   let community_id = community.id;
 114   let community_followers = blocking(context.pool(), move |conn| {
 115     CommunityFollowerView::for_community(conn, community_id)
 116   })
 117   .await??;
 118
 119   let mut collection = UnorderedCollection::new();
 120   collection
 121     .set_many_contexts(lemmy_context())
 122     .set_id(community.followers_url.into())
 123     .set_total_items(community_followers.len() as u64);
 124   Ok(create_apub_response(&collection))
 125 }
 126
 127 /// Returns the community outbox, which is populated by a maximum of 20 posts (but no other
 128 /// activites like votes or comments).
 129 pub(crate) async fn get_apub_community_outbox(
 130   info: web::Path<CommunityQuery>,
 131   context: web::Data<LemmyContext>,
 132 ) -> Result<HttpResponse<Body>, LemmyError> {
 133   let community = blocking(context.pool(), move |conn| {
 134     Community::read_from_name(conn, &info.community_name)
 135   })
 136   .await??;
 137   let id = ObjectId::new(generate_outbox_url(&community.actor_id)?.into_inner());
 138   let outbox_data = CommunityContext(community.into(), context.get_ref().clone());
 139   let outbox: ApubCommunityOutbox = id.dereference(&outbox_data, &mut 0).await?;
 140   Ok(create_apub_response(&outbox.to_apub(&outbox_data).await?))
 141 }
 142
 143 pub(crate) async fn get_apub_community_moderators(
 144   info: web::Path<CommunityQuery>,
 145   context: web::Data<LemmyContext>,
 146 ) -> Result<HttpResponse<Body>, LemmyError> {
 147   let community: ApubCommunity = blocking(context.pool(), move |conn| {
 148     Community::read_from_name(conn, &info.community_name)
 149   })
 150   .await??
 151   .into();
 152   let id = ObjectId::new(generate_outbox_url(&community.actor_id)?.into_inner());
 153   let outbox_data = CommunityContext(community, context.get_ref().clone());
 154   let moderators: ApubCommunityModerators = id.dereference(&outbox_data, &mut 0).await?;
 155   Ok(create_apub_response(
 156     &moderators.to_apub(&outbox_data).await?,
 157   ))
 158 }