crates/apub/src/http/community.rs

   1 use actix_web::{body::Body, web, web::Payload, HttpRequest, HttpResponse};
   2 use log::info;
   3 use serde::{Deserialize, Serialize};
   4
   5 use lemmy_api_common::blocking;
   6 use lemmy_apub_lib::{
   7   traits::{ActivityFields, ActivityHandler, ActorType, ApubObject},
   8   verify::verify_domains_match,
   9 };
  10 use lemmy_db_schema::source::community::Community;
  11 use lemmy_utils::LemmyError;
  12 use lemmy_websocket::LemmyContext;
  13
  14 use crate::{
  15   activities::{
  16     community::announce::{AnnouncableActivities, AnnounceActivity, GetCommunity},
  17     following::{follow::FollowCommunity, undo::UndoFollowCommunity},
  18     report::Report,
  19     verify_person_in_community,
  20   },
  21   collections::{
  22     community_moderators::ApubCommunityModerators,
  23     community_outbox::ApubCommunityOutbox,
  24     CommunityContext,
  25   },
  26   context::WithContext,
  27   fetcher::object_id::ObjectId,
  28   generate_outbox_url,
  29   http::{
  30     create_apub_response,
  31     create_apub_tombstone_response,
  32     payload_to_string,
  33     receive_activity,
  34   },
  35   objects::community::ApubCommunity,
  36   protocol::collections::group_followers::CommunityFollowers,
  37 };
  38
  39 #[derive(Deserialize)]
  40 pub(crate) struct CommunityQuery {
  41   community_name: String,
  42 }
  43
  44 /// Return the ActivityPub json representation of a local community over HTTP.
  45 pub(crate) async fn get_apub_community_http(
  46   info: web::Path<CommunityQuery>,
  47   context: web::Data<LemmyContext>,
  48 ) -> Result<HttpResponse<Body>, LemmyError> {
  49   let community: ApubCommunity = blocking(context.pool(), move |conn| {
  50     Community::read_from_name(conn, &info.community_name)
  51   })
  52   .await??
  53   .into();
  54
  55   if !community.deleted {
  56     let apub = community.to_apub(&**context).await?;
  57
  58     Ok(create_apub_response(&apub))
  59   } else {
  60     Ok(create_apub_tombstone_response(&community.to_tombstone()?))
  61   }
  62 }
  63
  64 #[derive(Clone, Debug, Deserialize, Serialize, ActivityHandler, ActivityFields)]
  65 #[serde(untagged)]
  66 #[activity_handler(LemmyContext)]
  67 pub enum GroupInboxActivities {
  68   FollowCommunity(FollowCommunity),
  69   UndoFollowCommunity(UndoFollowCommunity),
  70   AnnouncableActivities(AnnouncableActivities),
  71   Report(Report),
  72 }
  73
  74 /// Handler for all incoming receive to community inboxes.
  75 pub async fn community_inbox(
  76   request: HttpRequest,
  77   payload: Payload,
  78   _path: web::Path<String>,
  79   context: web::Data<LemmyContext>,
  80 ) -> Result<HttpResponse, LemmyError> {
  81   let unparsed = payload_to_string(payload).await?;
  82   info!("Received community inbox activity {}", unparsed);
  83   let activity = serde_json::from_str::<WithContext<GroupInboxActivities>>(&unparsed)?;
  84
  85   receive_group_inbox(activity.inner(), request, &context).await?;
  86
  87   Ok(HttpResponse::Ok().finish())
  88 }
  89
  90 pub(in crate::http) async fn receive_group_inbox(
  91   activity: GroupInboxActivities,
  92   request: HttpRequest,
  93   context: &LemmyContext,
  94 ) -> Result<HttpResponse, LemmyError> {
  95   let res = receive_activity(request, activity.clone(), context).await;
  96
  97   if let GroupInboxActivities::AnnouncableActivities(announcable) = activity {
  98     let community = announcable.get_community(context, &mut 0).await?;
  99     let actor_id = ObjectId::new(announcable.actor().clone());
 100     verify_domains_match(&community.actor_id(), announcable.id_unchecked())?;
 101     verify_person_in_community(&actor_id, &community, context, &mut 0).await?;
 102     if community.local {
 103       AnnounceActivity::send(announcable, &community, vec![], context).await?;
 104     }
 105   }
 106
 107   res
 108 }
 109
 110 /// Returns an empty followers collection, only populating the size (for privacy).
 111 pub(crate) async fn get_apub_community_followers(
 112   info: web::Path<CommunityQuery>,
 113   context: web::Data<LemmyContext>,
 114 ) -> Result<HttpResponse<Body>, LemmyError> {
 115   let community = blocking(context.pool(), move |conn| {
 116     Community::read_from_name(conn, &info.community_name)
 117   })
 118   .await??;
 119   let followers = CommunityFollowers::new(community, &context).await?;
 120   Ok(create_apub_response(&followers))
 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   let id = ObjectId::new(generate_outbox_url(&community.actor_id)?.into_inner());
 134   let outbox_data = CommunityContext(community.into(), context.get_ref().clone());
 135   let outbox: ApubCommunityOutbox = id.dereference(&outbox_data, &mut 0).await?;
 136   Ok(create_apub_response(&outbox.to_apub(&outbox_data).await?))
 137 }
 138
 139 pub(crate) async fn get_apub_community_moderators(
 140   info: web::Path<CommunityQuery>,
 141   context: web::Data<LemmyContext>,
 142 ) -> Result<HttpResponse<Body>, LemmyError> {
 143   let community: ApubCommunity = blocking(context.pool(), move |conn| {
 144     Community::read_from_name(conn, &info.community_name)
 145   })
 146   .await??
 147   .into();
 148   let id = ObjectId::new(generate_outbox_url(&community.actor_id)?.into_inner());
 149   let outbox_data = CommunityContext(community, context.get_ref().clone());
 150   let moderators: ApubCommunityModerators = id.dereference(&outbox_data, &mut 0).await?;
 151   Ok(create_apub_response(
 152     &moderators.to_apub(&outbox_data).await?,
 153   ))
 154 }