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   generate_outbox_url,
  11   http::{
  12     create_apub_response,
  13     create_apub_tombstone_response,
  14     payload_to_string,
  15     receive_activity,
  16     ActivityCommonFields,
  17   },
  18   objects::community::ApubCommunity,
  19   protocol::{
  20     activities::community::announce::AnnounceActivity,
  21     collections::group_followers::GroupFollowers,
  22   },
  23 };
  24 use actix_web::{web, web::Payload, HttpRequest, HttpResponse};
  25 use lemmy_api_common::blocking;
  26 use lemmy_apub_lib::{object_id::ObjectId, traits::ApubObject};
  27 use lemmy_db_schema::{source::community::Community, traits::ApubActor};
  28 use lemmy_utils::LemmyError;
  29 use lemmy_websocket::LemmyContext;
  30 use serde::Deserialize;
  31 use tracing::info;
  32
  33 #[derive(Deserialize)]
  34 pub(crate) struct CommunityQuery {
  35   community_name: String,
  36 }
  37
  38 /// Return the ActivityPub json representation of a local community over HTTP.
  39 #[tracing::instrument(skip_all)]
  40 pub(crate) async fn get_apub_community_http(
  41   info: web::Path<CommunityQuery>,
  42   context: web::Data<LemmyContext>,
  43 ) -> Result<HttpResponse, 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.into_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 #[tracing::instrument(skip_all)]
  61 pub async fn community_inbox(
  62   request: HttpRequest,
  63   payload: Payload,
  64   _path: web::Path<String>,
  65   context: web::Data<LemmyContext>,
  66 ) -> Result<HttpResponse, LemmyError> {
  67   let unparsed = payload_to_string(payload).await?;
  68   info!("Received community inbox activity {}", unparsed);
  69   let activity_data: ActivityCommonFields = serde_json::from_str(&unparsed)?;
  70   let activity = serde_json::from_str::<WithContext<GroupInboxActivities>>(&unparsed)?;
  71
  72   receive_group_inbox(activity.inner(), activity_data, request, &context).await?;
  73
  74   Ok(HttpResponse::Ok().finish())
  75 }
  76
  77 pub(in crate::http) async fn receive_group_inbox(
  78   activity: GroupInboxActivities,
  79   activity_data: ActivityCommonFields,
  80   request: HttpRequest,
  81   context: &LemmyContext,
  82 ) -> Result<HttpResponse, LemmyError> {
  83   let actor_id = ObjectId::new(activity_data.actor.clone());
  84   let res = receive_activity(request, activity.clone(), activity_data, context).await?;
  85
  86   if let GroupInboxActivities::AnnouncableActivities(announcable) = activity {
  87     // Ignore failures in get_community(). those happen because Delete/PrivateMessage is not in a
  88     // community, but looks identical to Delete/Post or Delete/Comment which are in a community.
  89     let community = announcable.get_community(context, &mut 0).await;
  90     if let Ok(community) = community {
  91       if community.local {
  92         verify_person_in_community(&actor_id, &community, context, &mut 0).await?;
  93         AnnounceActivity::send(*announcable, &community, context).await?;
  94       }
  95     }
  96   }
  97
  98   Ok(res)
  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, LemmyError> {
 106   let community = blocking(context.pool(), move |conn| {
 107     Community::read_from_name(conn, &info.community_name)
 108   })
 109   .await??;
 110   let followers = GroupFollowers::new(community, &context).await?;
 111   Ok(create_apub_response(&followers))
 112 }
 113
 114 /// Returns the community outbox, which is populated by a maximum of 20 posts (but no other
 115 /// activites like votes or comments).
 116 pub(crate) async fn get_apub_community_outbox(
 117   info: web::Path<CommunityQuery>,
 118   context: web::Data<LemmyContext>,
 119 ) -> Result<HttpResponse, LemmyError> {
 120   let community = blocking(context.pool(), move |conn| {
 121     Community::read_from_name(conn, &info.community_name)
 122   })
 123   .await??;
 124   let id = ObjectId::new(generate_outbox_url(&community.actor_id)?);
 125   let outbox_data = CommunityContext(community.into(), context.get_ref().clone());
 126   let outbox: ApubCommunityOutbox = id
 127     .dereference(&outbox_data, context.client(), &mut 0)
 128     .await?;
 129   Ok(create_apub_response(&outbox.into_apub(&outbox_data).await?))
 130 }
 131
 132 #[tracing::instrument(skip_all)]
 133 pub(crate) async fn get_apub_community_moderators(
 134   info: web::Path<CommunityQuery>,
 135   context: web::Data<LemmyContext>,
 136 ) -> Result<HttpResponse, LemmyError> {
 137   let community: ApubCommunity = blocking(context.pool(), move |conn| {
 138     Community::read_from_name(conn, &info.community_name)
 139   })
 140   .await??
 141   .into();
 142   let id = ObjectId::new(generate_outbox_url(&community.actor_id)?);
 143   let outbox_data = CommunityContext(community, context.get_ref().clone());
 144   let moderators: ApubCommunityModerators = id
 145     .dereference(&outbox_data, context.client(), &mut 0)
 146     .await?;
 147   Ok(create_apub_response(
 148     &moderators.into_apub(&outbox_data).await?,
 149   ))
 150 }