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   },
  18   objects::community::ApubCommunity,
  19   protocol::{
  20     activities::community::announce::AnnounceActivity,
  21     collections::group_followers::CommunityFollowers,
  22   },
  23 };
  24 use actix_web::{body::Body, web, web::Payload, HttpRequest, HttpResponse};
  25 use lemmy_api_common::blocking;
  26 use lemmy_apub_lib::{
  27   traits::{ActivityFields, ActorType, ApubObject},
  28   verify::verify_domains_match,
  29 };
  30 use lemmy_db_schema::source::community::Community;
  31 use lemmy_utils::LemmyError;
  32 use lemmy_websocket::LemmyContext;
  33 use log::info;
  34 use serde::Deserialize;
  35
  36 #[derive(Deserialize)]
  37 pub(crate) struct CommunityQuery {
  38   community_name: String,
  39 }
  40
  41 /// Return the ActivityPub json representation of a local community over HTTP.
  42 pub(crate) async fn get_apub_community_http(
  43   info: web::Path<CommunityQuery>,
  44   context: web::Data<LemmyContext>,
  45 ) -> Result<HttpResponse<Body>, LemmyError> {
  46   let community: ApubCommunity = blocking(context.pool(), move |conn| {
  47     Community::read_from_name(conn, &info.community_name)
  48   })
  49   .await??
  50   .into();
  51
  52   if !community.deleted {
  53     let apub = community.to_apub(&**context).await?;
  54
  55     Ok(create_apub_response(&apub))
  56   } else {
  57     Ok(create_apub_tombstone_response(&community.to_tombstone()?))
  58   }
  59 }
  60
  61 /// Handler for all incoming receive to community inboxes.
  62 pub async fn community_inbox(
  63   request: HttpRequest,
  64   payload: Payload,
  65   _path: web::Path<String>,
  66   context: web::Data<LemmyContext>,
  67 ) -> Result<HttpResponse, LemmyError> {
  68   let unparsed = payload_to_string(payload).await?;
  69   info!("Received community inbox activity {}", unparsed);
  70   let activity = serde_json::from_str::<WithContext<GroupInboxActivities>>(&unparsed)?;
  71
  72   receive_group_inbox(activity.inner(), 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   request: HttpRequest,
  80   context: &LemmyContext,
  81 ) -> Result<HttpResponse, LemmyError> {
  82   let res = receive_activity(request, activity.clone(), context).await;
  83
  84   if let GroupInboxActivities::AnnouncableActivities(announcable) = activity {
  85     let community = announcable.get_community(context, &mut 0).await?;
  86     let actor_id = ObjectId::new(announcable.actor().clone());
  87     verify_domains_match(&community.actor_id(), announcable.id_unchecked())?;
  88     verify_person_in_community(&actor_id, &community, context, &mut 0).await?;
  89     if community.local {
  90       AnnounceActivity::send(announcable, &community, vec![], context).await?;
  91     }
  92   }
  93
  94   res
  95 }
  96
  97 /// Returns an empty followers collection, only populating the size (for privacy).
  98 pub(crate) async fn get_apub_community_followers(
  99   info: web::Path<CommunityQuery>,
 100   context: web::Data<LemmyContext>,
 101 ) -> Result<HttpResponse<Body>, LemmyError> {
 102   let community = blocking(context.pool(), move |conn| {
 103     Community::read_from_name(conn, &info.community_name)
 104   })
 105   .await??;
 106   let followers = CommunityFollowers::new(community, &context).await?;
 107   Ok(create_apub_response(&followers))
 108 }
 109
 110 /// Returns the community outbox, which is populated by a maximum of 20 posts (but no other
 111 /// activites like votes or comments).
 112 pub(crate) async fn get_apub_community_outbox(
 113   info: web::Path<CommunityQuery>,
 114   context: web::Data<LemmyContext>,
 115 ) -> Result<HttpResponse<Body>, LemmyError> {
 116   let community = blocking(context.pool(), move |conn| {
 117     Community::read_from_name(conn, &info.community_name)
 118   })
 119   .await??;
 120   let id = ObjectId::new(generate_outbox_url(&community.actor_id)?.into_inner());
 121   let outbox_data = CommunityContext(community.into(), context.get_ref().clone());
 122   let outbox: ApubCommunityOutbox = id.dereference(&outbox_data, &mut 0).await?;
 123   Ok(create_apub_response(&outbox.to_apub(&outbox_data).await?))
 124 }
 125
 126 pub(crate) async fn get_apub_community_moderators(
 127   info: web::Path<CommunityQuery>,
 128   context: web::Data<LemmyContext>,
 129 ) -> Result<HttpResponse<Body>, LemmyError> {
 130   let community: ApubCommunity = blocking(context.pool(), move |conn| {
 131     Community::read_from_name(conn, &info.community_name)
 132   })
 133   .await??
 134   .into();
 135   let id = ObjectId::new(generate_outbox_url(&community.actor_id)?.into_inner());
 136   let outbox_data = CommunityContext(community, context.get_ref().clone());
 137   let moderators: ApubCommunityModerators = id.dereference(&outbox_data, &mut 0).await?;
 138   Ok(create_apub_response(
 139     &moderators.to_apub(&outbox_data).await?,
 140   ))
 141 }