crates/apub/src/http/community.rs

   1 use crate::{
   2   activities::{community::announce::GetCommunity, verify_person_in_community},
   3   activity_lists::GroupInboxActivities,
   4   collections::{
   5     community_moderators::ApubCommunityModerators,
   6     community_outbox::ApubCommunityOutbox,
   7     CommunityContext,
   8   },
   9   context::WithContext,
  10   fetcher::object_id::ObjectId,
  11   generate_outbox_url,
  12   http::{
  13     create_apub_response,
  14     create_apub_tombstone_response,
  15     payload_to_string,
  16     receive_activity,
  17     ActivityCommonFields,
  18   },
  19   objects::community::ApubCommunity,
  20   protocol::{
  21     activities::community::announce::AnnounceActivity,
  22     collections::group_followers::GroupFollowers,
  23   },
  24 };
  25 use actix_web::{body::Body, web, web::Payload, HttpRequest, HttpResponse};
  26 use lemmy_api_common::blocking;
  27 use lemmy_apub_lib::traits::ApubObject;
  28 use lemmy_db_schema::source::community::Community;
  29 use lemmy_utils::LemmyError;
  30 use lemmy_websocket::LemmyContext;
  31 use log::info;
  32 use serde::Deserialize;
  33
  34 #[derive(Deserialize)]
  35 pub(crate) struct CommunityQuery {
  36   community_name: String,
  37 }
  38
  39 /// Return the ActivityPub json representation of a local community over HTTP.
  40 pub(crate) async fn get_apub_community_http(
  41   info: web::Path<CommunityQuery>,
  42   context: web::Data<LemmyContext>,
  43 ) -> Result<HttpResponse<Body>, LemmyError> {
  44   let community: ApubCommunity = blocking(context.pool(), move |conn| {
  45     Community::read_from_name(conn, &info.community_name)
  46   })
  47   .await??
  48   .into();
  49
  50   if !community.deleted {
  51     let apub = community.to_apub(&**context).await?;
  52
  53     Ok(create_apub_response(&apub))
  54   } else {
  55     Ok(create_apub_tombstone_response(&community.to_tombstone()?))
  56   }
  57 }
  58
  59 /// Handler for all incoming receive to community inboxes.
  60 pub async fn community_inbox(
  61   request: HttpRequest,
  62   payload: Payload,
  63   _path: web::Path<String>,
  64   context: web::Data<LemmyContext>,
  65 ) -> Result<HttpResponse, LemmyError> {
  66   let unparsed = payload_to_string(payload).await?;
  67   info!("Received community inbox activity {}", unparsed);
  68   let activity_data: ActivityCommonFields = serde_json::from_str(&unparsed)?;
  69   let activity = serde_json::from_str::<WithContext<GroupInboxActivities>>(&unparsed)?;
  70
  71   receive_group_inbox(activity.inner(), activity_data, request, &context).await?;
  72
  73   Ok(HttpResponse::Ok().finish())
  74 }
  75
  76 pub(in crate::http) async fn receive_group_inbox(
  77   activity: GroupInboxActivities,
  78   activity_data: ActivityCommonFields,
  79   request: HttpRequest,
  80   context: &LemmyContext,
  81 ) -> Result<HttpResponse, LemmyError> {
  82   let actor_id = ObjectId::new(activity_data.actor.clone());
  83   let res = receive_activity(request, activity.clone(), activity_data, context).await;
  84
  85   if let GroupInboxActivities::AnnouncableActivities(announcable) = activity {
  86     let community = announcable.get_community(context, &mut 0).await?;
  87     verify_person_in_community(&actor_id, &community, context, &mut 0).await?;
  88     if community.local {
  89       AnnounceActivity::send(announcable, &community, vec![], context).await?;
  90     }
  91   }
  92
  93   res
  94 }
  95
  96 /// Returns an empty followers collection, only populating the size (for privacy).
  97 pub(crate) async fn get_apub_community_followers(
  98   info: web::Path<CommunityQuery>,
  99   context: web::Data<LemmyContext>,
 100 ) -> Result<HttpResponse<Body>, LemmyError> {
 101   let community = blocking(context.pool(), move |conn| {
 102     Community::read_from_name(conn, &info.community_name)
 103   })
 104   .await??;
 105   let followers = GroupFollowers::new(community, &context).await?;
 106   Ok(create_apub_response(&followers))
 107 }
 108
 109 /// Returns the community outbox, which is populated by a maximum of 20 posts (but no other
 110 /// activites like votes or comments).
 111 pub(crate) async fn get_apub_community_outbox(
 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 id = ObjectId::new(generate_outbox_url(&community.actor_id)?.into_inner());
 120   let outbox_data = CommunityContext(community.into(), context.get_ref().clone());
 121   let outbox: ApubCommunityOutbox = id.dereference(&outbox_data, &mut 0).await?;
 122   Ok(create_apub_response(&outbox.to_apub(&outbox_data).await?))
 123 }
 124
 125 pub(crate) async fn get_apub_community_moderators(
 126   info: web::Path<CommunityQuery>,
 127   context: web::Data<LemmyContext>,
 128 ) -> Result<HttpResponse<Body>, LemmyError> {
 129   let community: ApubCommunity = blocking(context.pool(), move |conn| {
 130     Community::read_from_name(conn, &info.community_name)
 131   })
 132   .await??
 133   .into();
 134   let id = ObjectId::new(generate_outbox_url(&community.actor_id)?.into_inner());
 135   let outbox_data = CommunityContext(community, context.get_ref().clone());
 136   let moderators: ApubCommunityModerators = id.dereference(&outbox_data, &mut 0).await?;
 137   Ok(create_apub_response(
 138     &moderators.to_apub(&outbox_data).await?,
 139   ))
 140 }