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::GroupFollowers,
  22   },
  23 };
  24 use actix_web::{body::Body, web, web::Payload, HttpRequest, HttpResponse};
  25 use lemmy_api_common::blocking;
  26 use lemmy_apub_lib::traits::{ActivityFields, ApubObject};
  27 use lemmy_db_schema::source::community::Community;
  28 use lemmy_utils::LemmyError;
  29 use lemmy_websocket::LemmyContext;
  30 use log::info;
  31 use serde::Deserialize;
  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 pub(crate) async fn get_apub_community_http(
  40   info: web::Path<CommunityQuery>,
  41   context: web::Data<LemmyContext>,
  42 ) -> Result<HttpResponse<Body>, LemmyError> {
  43   let community: ApubCommunity = blocking(context.pool(), move |conn| {
  44     Community::read_from_name(conn, &info.community_name)
  45   })
  46   .await??
  47   .into();
  48
  49   if !community.deleted {
  50     let apub = community.to_apub(&**context).await?;
  51
  52     Ok(create_apub_response(&apub))
  53   } else {
  54     Ok(create_apub_tombstone_response(&community.to_tombstone()?))
  55   }
  56 }
  57
  58 /// Handler for all incoming receive to community inboxes.
  59 pub async fn community_inbox(
  60   request: HttpRequest,
  61   payload: Payload,
  62   _path: web::Path<String>,
  63   context: web::Data<LemmyContext>,
  64 ) -> Result<HttpResponse, LemmyError> {
  65   let unparsed = payload_to_string(payload).await?;
  66   info!("Received community inbox activity {}", unparsed);
  67   let activity = serde_json::from_str::<WithContext<GroupInboxActivities>>(&unparsed)?;
  68
  69   receive_group_inbox(activity.inner(), request, &context).await?;
  70
  71   Ok(HttpResponse::Ok().finish())
  72 }
  73
  74 pub(in crate::http) async fn receive_group_inbox(
  75   activity: GroupInboxActivities,
  76   request: HttpRequest,
  77   context: &LemmyContext,
  78 ) -> Result<HttpResponse, LemmyError> {
  79   let res = receive_activity(request, activity.clone(), context).await;
  80
  81   if let GroupInboxActivities::AnnouncableActivities(announcable) = activity {
  82     let community = announcable.get_community(context, &mut 0).await?;
  83     let actor_id = ObjectId::new(announcable.actor().clone());
  84     verify_person_in_community(&actor_id, &community, context, &mut 0).await?;
  85     if community.local {
  86       AnnounceActivity::send(announcable, &community, vec![], context).await?;
  87     }
  88   }
  89
  90   res
  91 }
  92
  93 /// Returns an empty followers collection, only populating the size (for privacy).
  94 pub(crate) async fn get_apub_community_followers(
  95   info: web::Path<CommunityQuery>,
  96   context: web::Data<LemmyContext>,
  97 ) -> Result<HttpResponse<Body>, LemmyError> {
  98   let community = blocking(context.pool(), move |conn| {
  99     Community::read_from_name(conn, &info.community_name)
 100   })
 101   .await??;
 102   let followers = GroupFollowers::new(community, &context).await?;
 103   Ok(create_apub_response(&followers))
 104 }
 105
 106 /// Returns the community outbox, which is populated by a maximum of 20 posts (but no other
 107 /// activites like votes or comments).
 108 pub(crate) async fn get_apub_community_outbox(
 109   info: web::Path<CommunityQuery>,
 110   context: web::Data<LemmyContext>,
 111 ) -> Result<HttpResponse<Body>, LemmyError> {
 112   let community = blocking(context.pool(), move |conn| {
 113     Community::read_from_name(conn, &info.community_name)
 114   })
 115   .await??;
 116   let id = ObjectId::new(generate_outbox_url(&community.actor_id)?.into_inner());
 117   let outbox_data = CommunityContext(community.into(), context.get_ref().clone());
 118   let outbox: ApubCommunityOutbox = id.dereference(&outbox_data, &mut 0).await?;
 119   Ok(create_apub_response(&outbox.to_apub(&outbox_data).await?))
 120 }
 121
 122 pub(crate) async fn get_apub_community_moderators(
 123   info: web::Path<CommunityQuery>,
 124   context: web::Data<LemmyContext>,
 125 ) -> Result<HttpResponse<Body>, LemmyError> {
 126   let community: ApubCommunity = blocking(context.pool(), move |conn| {
 127     Community::read_from_name(conn, &info.community_name)
 128   })
 129   .await??
 130   .into();
 131   let id = ObjectId::new(generate_outbox_url(&community.actor_id)?.into_inner());
 132   let outbox_data = CommunityContext(community, context.get_ref().clone());
 133   let moderators: ApubCommunityModerators = id.dereference(&outbox_data, &mut 0).await?;
 134   Ok(create_apub_response(
 135     &moderators.to_apub(&outbox_data).await?,
 136   ))
 137 }