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_queries::source::{activity::Activity_, community::Community_};
  28 use lemmy_db_schema::source::{activity::Activity, community::Community};
  29 use lemmy_db_views_actor::{
  30   community_follower_view::CommunityFollowerView,
  31   community_moderator_view::CommunityModeratorView,
  32 };
  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 = blocking(context.pool(), move |conn| {
  49     Community::read_from_name(conn, &info.community_name)
  50   })
  51   .await??;
  52
  53   if !community.deleted {
  54     let apub = community.to_apub(context.pool()).await?;
  55
  56     Ok(create_apub_response(&apub))
  57   } else {
  58     Ok(create_apub_tombstone_response(&community.to_tombstone()?))
  59   }
  60 }
  61
  62 #[derive(Clone, Debug, Deserialize, Serialize, ActivityHandler, ActivityFields)]
  63 #[serde(untagged)]
  64 #[activity_handler(LemmyContext)]
  65 pub enum GroupInboxActivities {
  66   FollowCommunity(FollowCommunity),
  67   UndoFollowCommunity(UndoFollowCommunity),
  68   AnnouncableActivities(AnnouncableActivities),
  69   Report(Report),
  70 }
  71
  72 /// Handler for all incoming receive to community inboxes.
  73 pub async fn community_inbox(
  74   request: HttpRequest,
  75   payload: Payload,
  76   _path: web::Path<String>,
  77   context: web::Data<LemmyContext>,
  78 ) -> Result<HttpResponse, LemmyError> {
  79   let unparsed = payload_to_string(payload).await?;
  80   trace!("Received community inbox activity {}", unparsed);
  81   let activity = serde_json::from_str::<GroupInboxActivities>(&unparsed)?;
  82
  83   receive_group_inbox(activity.clone(), request, &context).await?;
  84
  85   if let GroupInboxActivities::AnnouncableActivities(announcable) = activity {
  86     let community = extract_community(&announcable.cc(), &context, &mut 0).await?;
  87     if community.local {
  88       AnnounceActivity::send(announcable, &community, vec![], &context).await?;
  89     }
  90   }
  91   Ok(HttpResponse::Ok().finish())
  92 }
  93
  94 pub(in crate::http) async fn receive_group_inbox(
  95   activity: GroupInboxActivities,
  96   request: HttpRequest,
  97   context: &LemmyContext,
  98 ) -> Result<HttpResponse, LemmyError> {
  99   receive_activity(request, activity.clone(), context).await
 100 }
 101
 102 /// Returns an empty followers collection, only populating the size (for privacy).
 103 pub(crate) async fn get_apub_community_followers(
 104   info: web::Path<CommunityQuery>,
 105   context: web::Data<LemmyContext>,
 106 ) -> Result<HttpResponse<Body>, LemmyError> {
 107   let community = blocking(context.pool(), move |conn| {
 108     Community::read_from_name(conn, &info.community_name)
 109   })
 110   .await??;
 111
 112   let community_id = community.id;
 113   let community_followers = blocking(context.pool(), move |conn| {
 114     CommunityFollowerView::for_community(conn, community_id)
 115   })
 116   .await??;
 117
 118   let mut collection = UnorderedCollection::new();
 119   collection
 120     .set_many_contexts(lemmy_context())
 121     .set_id(community.followers_url.into())
 122     .set_total_items(community_followers.len() as u64);
 123   Ok(create_apub_response(&collection))
 124 }
 125
 126 /// Returns the community outbox, which is populated by a maximum of 20 posts (but no other
 127 /// activites like votes or comments).
 128 pub(crate) async fn get_apub_community_outbox(
 129   info: web::Path<CommunityQuery>,
 130   context: web::Data<LemmyContext>,
 131 ) -> Result<HttpResponse<Body>, LemmyError> {
 132   let community = blocking(context.pool(), move |conn| {
 133     Community::read_from_name(conn, &info.community_name)
 134   })
 135   .await??;
 136
 137   let community_actor_id = community.actor_id.to_owned();
 138   let activities = blocking(context.pool(), move |conn| {
 139     Activity::read_community_outbox(conn, &community_actor_id)
 140   })
 141   .await??;
 142
 143   let activities = activities
 144     .iter()
 145     .map(AnyBase::from_arbitrary_json)
 146     .collect::<Result<Vec<AnyBase>, serde_json::Error>>()?;
 147   let len = activities.len();
 148   let mut collection = OrderedCollection::new();
 149   collection
 150     .set_many_items(activities)
 151     .set_many_contexts(lemmy_context())
 152     .set_id(generate_outbox_url(&community.actor_id)?.into())
 153     .set_total_items(len as u64);
 154   Ok(create_apub_response(&collection))
 155 }
 156
 157 pub(crate) async fn get_apub_community_inbox(
 158   info: web::Path<CommunityQuery>,
 159   context: web::Data<LemmyContext>,
 160 ) -> Result<HttpResponse<Body>, LemmyError> {
 161   let community = blocking(context.pool(), move |conn| {
 162     Community::read_from_name(conn, &info.community_name)
 163   })
 164   .await??;
 165
 166   let mut collection = OrderedCollection::new();
 167   collection
 168     .set_id(community.inbox_url.into())
 169     .set_many_contexts(lemmy_context());
 170   Ok(create_apub_response(&collection))
 171 }
 172
 173 pub(crate) async fn get_apub_community_moderators(
 174   info: web::Path<CommunityQuery>,
 175   context: web::Data<LemmyContext>,
 176 ) -> Result<HttpResponse<Body>, LemmyError> {
 177   let community = blocking(context.pool(), move |conn| {
 178     Community::read_from_name(conn, &info.community_name)
 179   })
 180   .await??;
 181
 182   // The attributed to, is an ordered vector with the creator actor_ids first,
 183   // then the rest of the moderators
 184   // TODO Technically the instance admins can mod the community, but lets
 185   // ignore that for now
 186   let cid = community.id;
 187   let moderators = blocking(context.pool(), move |conn| {
 188     CommunityModeratorView::for_community(conn, cid)
 189   })
 190   .await??;
 191
 192   let moderators: Vec<Url> = moderators
 193     .into_iter()
 194     .map(|m| m.moderator.actor_id.into())
 195     .collect();
 196   let mut collection = OrderedCollection::new();
 197   collection
 198     .set_id(generate_moderators_url(&community.actor_id)?.into())
 199     .set_total_items(moderators.len() as u64)
 200     .set_many_items(moderators)
 201     .set_many_contexts(lemmy_context());
 202   Ok(create_apub_response(&collection))
 203 }