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   context::lemmy_context,
   9   generate_moderators_url,
  10   generate_outbox_url,
  11   http::{
  12     create_apub_response,
  13     create_apub_tombstone_response,
  14     payload_to_string,
  15     receive_activity,
  16   },
  17   objects::ToApub,
  18 };
  19 use activitystreams::{
  20   base::{AnyBase, BaseExt},
  21   collection::{CollectionExt, OrderedCollection, UnorderedCollection},
  22   url::Url,
  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};
  27 use lemmy_db_schema::source::{activity::Activity, community::Community};
  28 use lemmy_db_views_actor::{
  29   community_follower_view::CommunityFollowerView,
  30   community_moderator_view::CommunityModeratorView,
  31 };
  32 use lemmy_utils::LemmyError;
  33 use lemmy_websocket::LemmyContext;
  34 use log::trace;
  35 use serde::{Deserialize, Serialize};
  36
  37 #[derive(Deserialize)]
  38 pub(crate) struct CommunityQuery {
  39   community_name: String,
  40 }
  41
  42 /// Return the ActivityPub json representation of a local community over HTTP.
  43 pub(crate) async fn get_apub_community_http(
  44   info: web::Path<CommunityQuery>,
  45   context: web::Data<LemmyContext>,
  46 ) -> Result<HttpResponse<Body>, LemmyError> {
  47   let community = blocking(context.pool(), move |conn| {
  48     Community::read_from_name(conn, &info.community_name)
  49   })
  50   .await??;
  51
  52   if !community.deleted {
  53     let apub = community.to_apub(context.pool()).await?;
  54
  55     Ok(create_apub_response(&apub))
  56   } else {
  57     Ok(create_apub_tombstone_response(&community.to_tombstone()?))
  58   }
  59 }
  60
  61 #[derive(Clone, Debug, Deserialize, Serialize, ActivityHandler, ActivityFields)]
  62 #[serde(untagged)]
  63 #[activity_handler(LemmyContext)]
  64 pub enum GroupInboxActivities {
  65   FollowCommunity(FollowCommunity),
  66   UndoFollowCommunity(UndoFollowCommunity),
  67   AnnouncableActivities(AnnouncableActivities),
  68   Report(Report),
  69 }
  70
  71 /// Handler for all incoming receive to community inboxes.
  72 pub async fn community_inbox(
  73   request: HttpRequest,
  74   payload: Payload,
  75   _path: web::Path<String>,
  76   context: web::Data<LemmyContext>,
  77 ) -> Result<HttpResponse, LemmyError> {
  78   let unparsed = payload_to_string(payload).await?;
  79   trace!("Received community inbox activity {}", unparsed);
  80   let activity = serde_json::from_str::<GroupInboxActivities>(&unparsed)?;
  81
  82   receive_group_inbox(activity.clone(), request, &context).await?;
  83
  84   if let GroupInboxActivities::AnnouncableActivities(announcable) = activity {
  85     let community = extract_community(&announcable.cc(), &context, &mut 0).await?;
  86     if community.local {
  87       AnnounceActivity::send(announcable, &community, vec![], &context).await?;
  88     }
  89   }
  90   Ok(HttpResponse::Ok().finish())
  91 }
  92
  93 pub(in crate::http) async fn receive_group_inbox(
  94   activity: GroupInboxActivities,
  95   request: HttpRequest,
  96   context: &LemmyContext,
  97 ) -> Result<HttpResponse, LemmyError> {
  98   receive_activity(request, activity.clone(), context).await
  99 }
 100
 101 /// Returns an empty followers collection, only populating the size (for privacy).
 102 pub(crate) async fn get_apub_community_followers(
 103   info: web::Path<CommunityQuery>,
 104   context: web::Data<LemmyContext>,
 105 ) -> Result<HttpResponse<Body>, LemmyError> {
 106   let community = blocking(context.pool(), move |conn| {
 107     Community::read_from_name(conn, &info.community_name)
 108   })
 109   .await??;
 110
 111   let community_id = community.id;
 112   let community_followers = blocking(context.pool(), move |conn| {
 113     CommunityFollowerView::for_community(conn, community_id)
 114   })
 115   .await??;
 116
 117   let mut collection = UnorderedCollection::new();
 118   collection
 119     .set_many_contexts(lemmy_context())
 120     .set_id(community.followers_url.into())
 121     .set_total_items(community_followers.len() as u64);
 122   Ok(create_apub_response(&collection))
 123 }
 124
 125 /// Returns the community outbox, which is populated by a maximum of 20 posts (but no other
 126 /// activites like votes or comments).
 127 pub(crate) async fn get_apub_community_outbox(
 128   info: web::Path<CommunityQuery>,
 129   context: web::Data<LemmyContext>,
 130 ) -> Result<HttpResponse<Body>, LemmyError> {
 131   let community = blocking(context.pool(), move |conn| {
 132     Community::read_from_name(conn, &info.community_name)
 133   })
 134   .await??;
 135
 136   let community_actor_id = community.actor_id.to_owned();
 137   let activities = blocking(context.pool(), move |conn| {
 138     Activity::read_community_outbox(conn, &community_actor_id)
 139   })
 140   .await??;
 141
 142   let activities = activities
 143     .iter()
 144     .map(AnyBase::from_arbitrary_json)
 145     .collect::<Result<Vec<AnyBase>, serde_json::Error>>()?;
 146   let len = activities.len();
 147   let mut collection = OrderedCollection::new();
 148   collection
 149     .set_many_items(activities)
 150     .set_many_contexts(lemmy_context())
 151     .set_id(generate_outbox_url(&community.actor_id)?.into())
 152     .set_total_items(len as u64);
 153   Ok(create_apub_response(&collection))
 154 }
 155
 156 pub(crate) async fn get_apub_community_inbox(
 157   info: web::Path<CommunityQuery>,
 158   context: web::Data<LemmyContext>,
 159 ) -> Result<HttpResponse<Body>, LemmyError> {
 160   let community = blocking(context.pool(), move |conn| {
 161     Community::read_from_name(conn, &info.community_name)
 162   })
 163   .await??;
 164
 165   let mut collection = OrderedCollection::new();
 166   collection
 167     .set_id(community.inbox_url.into())
 168     .set_many_contexts(lemmy_context());
 169   Ok(create_apub_response(&collection))
 170 }
 171
 172 pub(crate) async fn get_apub_community_moderators(
 173   info: web::Path<CommunityQuery>,
 174   context: web::Data<LemmyContext>,
 175 ) -> Result<HttpResponse<Body>, LemmyError> {
 176   let community = blocking(context.pool(), move |conn| {
 177     Community::read_from_name(conn, &info.community_name)
 178   })
 179   .await??;
 180
 181   // The attributed to, is an ordered vector with the creator actor_ids first,
 182   // then the rest of the moderators
 183   // TODO Technically the instance admins can mod the community, but lets
 184   // ignore that for now
 185   let cid = community.id;
 186   let moderators = blocking(context.pool(), move |conn| {
 187     CommunityModeratorView::for_community(conn, cid)
 188   })
 189   .await??;
 190
 191   let moderators: Vec<Url> = moderators
 192     .into_iter()
 193     .map(|m| m.moderator.actor_id.into())
 194     .collect();
 195   let mut collection = OrderedCollection::new();
 196   collection
 197     .set_id(generate_moderators_url(&community.actor_id)?.into())
 198     .set_total_items(moderators.len() as u64)
 199     .set_many_items(moderators)
 200     .set_many_contexts(lemmy_context());
 201   Ok(create_apub_response(&collection))
 202 }