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   },
   7   extensions::context::lemmy_context,
   8   generate_moderators_url,
   9   http::{
  10     create_apub_response,
  11     create_apub_tombstone_response,
  12     payload_to_string,
  13     receive_activity,
  14   },
  15   objects::ToApub,
  16   ActorType,
  17 };
  18 use activitystreams::{
  19   base::{AnyBase, BaseExt},
  20   collection::{CollectionExt, OrderedCollection, UnorderedCollection},
  21   url::Url,
  22 };
  23 use actix_web::{body::Body, web, web::Payload, HttpRequest, HttpResponse};
  24 use lemmy_api_common::blocking;
  25 use lemmy_apub_lib::{ActivityFields, ActivityHandler};
  26 use lemmy_db_queries::source::{activity::Activity_, community::Community_};
  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 pub enum GroupInboxActivities {
  64   FollowCommunity(FollowCommunity),
  65   UndoFollowCommunity(UndoFollowCommunity),
  66   AnnouncableActivities(AnnouncableActivities),
  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   if let GroupInboxActivities::AnnouncableActivities(announcable) = activity {
  83     let community = extract_community(&announcable.cc(), &context, &mut 0).await?;
  84     if community.local {
  85       AnnounceActivity::send(announcable, &community, vec![], &context).await?;
  86     }
  87   }
  88   Ok(HttpResponse::Ok().finish())
  89 }
  90
  91 pub(in crate::http) async fn receive_group_inbox(
  92   activity: GroupInboxActivities,
  93   request: HttpRequest,
  94   context: &LemmyContext,
  95 ) -> Result<HttpResponse, LemmyError> {
  96   receive_activity(request, activity.clone(), context).await
  97 }
  98
  99 /// Returns an empty followers collection, only populating the size (for privacy).
 100 pub(crate) async fn get_apub_community_followers(
 101   info: web::Path<CommunityQuery>,
 102   context: web::Data<LemmyContext>,
 103 ) -> Result<HttpResponse<Body>, LemmyError> {
 104   let community = blocking(context.pool(), move |conn| {
 105     Community::read_from_name(conn, &info.community_name)
 106   })
 107   .await??;
 108
 109   let community_id = community.id;
 110   let community_followers = blocking(context.pool(), move |conn| {
 111     CommunityFollowerView::for_community(conn, community_id)
 112   })
 113   .await??;
 114
 115   let mut collection = UnorderedCollection::new();
 116   collection
 117     .set_many_contexts(lemmy_context())
 118     .set_id(community.followers_url.into())
 119     .set_total_items(community_followers.len() as u64);
 120   Ok(create_apub_response(&collection))
 121 }
 122
 123 /// Returns the community outbox, which is populated by a maximum of 20 posts (but no other
 124 /// activites like votes or comments).
 125 pub(crate) async fn get_apub_community_outbox(
 126   info: web::Path<CommunityQuery>,
 127   context: web::Data<LemmyContext>,
 128 ) -> Result<HttpResponse<Body>, LemmyError> {
 129   let community = blocking(context.pool(), move |conn| {
 130     Community::read_from_name(conn, &info.community_name)
 131   })
 132   .await??;
 133
 134   let community_actor_id = community.actor_id.to_owned();
 135   let activities = blocking(context.pool(), move |conn| {
 136     Activity::read_community_outbox(conn, &community_actor_id)
 137   })
 138   .await??;
 139
 140   let activities = activities
 141     .iter()
 142     .map(AnyBase::from_arbitrary_json)
 143     .collect::<Result<Vec<AnyBase>, serde_json::Error>>()?;
 144   let len = activities.len();
 145   let mut collection = OrderedCollection::new();
 146   collection
 147     .set_many_items(activities)
 148     .set_many_contexts(lemmy_context())
 149     .set_id(community.get_outbox_url()?)
 150     .set_total_items(len as u64);
 151   Ok(create_apub_response(&collection))
 152 }
 153
 154 pub(crate) async fn get_apub_community_inbox(
 155   info: web::Path<CommunityQuery>,
 156   context: web::Data<LemmyContext>,
 157 ) -> Result<HttpResponse<Body>, LemmyError> {
 158   let community = blocking(context.pool(), move |conn| {
 159     Community::read_from_name(conn, &info.community_name)
 160   })
 161   .await??;
 162
 163   let mut collection = OrderedCollection::new();
 164   collection
 165     .set_id(community.inbox_url.into())
 166     .set_many_contexts(lemmy_context());
 167   Ok(create_apub_response(&collection))
 168 }
 169
 170 pub(crate) async fn get_apub_community_moderators(
 171   info: web::Path<CommunityQuery>,
 172   context: web::Data<LemmyContext>,
 173 ) -> Result<HttpResponse<Body>, LemmyError> {
 174   let community = blocking(context.pool(), move |conn| {
 175     Community::read_from_name(conn, &info.community_name)
 176   })
 177   .await??;
 178
 179   // The attributed to, is an ordered vector with the creator actor_ids first,
 180   // then the rest of the moderators
 181   // TODO Technically the instance admins can mod the community, but lets
 182   // ignore that for now
 183   let cid = community.id;
 184   let moderators = blocking(context.pool(), move |conn| {
 185     CommunityModeratorView::for_community(conn, cid)
 186   })
 187   .await??;
 188
 189   let moderators: Vec<Url> = moderators
 190     .into_iter()
 191     .map(|m| m.moderator.actor_id.into())
 192     .collect();
 193   let mut collection = OrderedCollection::new();
 194   collection
 195     .set_id(generate_moderators_url(&community.actor_id)?.into())
 196     .set_total_items(moderators.len() as u64)
 197     .set_many_items(moderators)
 198     .set_many_contexts(lemmy_context());
 199   Ok(create_apub_response(&collection))
 200 }