crates/apub/src/api/read_community.rs

   1 use crate::{
   2   api::PerformApub,
   3   fetcher::resolve_actor_identifier,
   4   objects::community::ApubCommunity,
   5 };
   6 use activitypub_federation::config::Data;
   7 use lemmy_api_common::{
   8   community::{GetCommunity, GetCommunityResponse},
   9   context::LemmyContext,
  10   utils::{check_private_instance, get_local_user_view_from_jwt_opt, is_mod_or_admin_opt},
  11   websocket::handlers::online_users::GetCommunityUsersOnline,
  12 };
  13 use lemmy_db_schema::{
  14   impls::actor_language::default_post_language,
  15   source::{
  16     actor_language::CommunityLanguage,
  17     community::Community,
  18     local_site::LocalSite,
  19     site::Site,
  20   },
  21 };
  22 use lemmy_db_views_actor::structs::{CommunityModeratorView, CommunityView};
  23 use lemmy_utils::{error::LemmyError, ConnectionId};
  24
  25 #[async_trait::async_trait]
  26 impl PerformApub for GetCommunity {
  27   type Response = GetCommunityResponse;
  28
  29   #[tracing::instrument(skip(context, _websocket_id))]
  30   async fn perform(
  31     &self,
  32     context: &Data<LemmyContext>,
  33     _websocket_id: Option<ConnectionId>,
  34   ) -> Result<GetCommunityResponse, LemmyError> {
  35     let data: &GetCommunity = self;
  36     let local_user_view =
  37       get_local_user_view_from_jwt_opt(data.auth.as_ref(), context.pool(), context.secret())
  38         .await?;
  39     let local_site = LocalSite::read(context.pool()).await?;
  40
  41     if data.name.is_none() && data.id.is_none() {
  42       return Err(LemmyError::from_message("no_id_given"));
  43     }
  44
  45     check_private_instance(&local_user_view, &local_site)?;
  46
  47     let person_id = local_user_view.as_ref().map(|u| u.person.id);
  48
  49     let community_id = match data.id {
  50       Some(id) => id,
  51       None => {
  52         let name = data.name.clone().unwrap_or_else(|| "main".to_string());
  53         resolve_actor_identifier::<ApubCommunity, Community>(&name, context, &local_user_view, true)
  54           .await
  55           .map_err(|e| e.with_message("couldnt_find_community"))?
  56           .id
  57       }
  58     };
  59
  60     let is_mod_or_admin =
  61       is_mod_or_admin_opt(context.pool(), local_user_view.as_ref(), Some(community_id))
  62         .await
  63         .is_ok();
  64
  65     let community_view = CommunityView::read(
  66       context.pool(),
  67       community_id,
  68       person_id,
  69       Some(is_mod_or_admin),
  70     )
  71     .await
  72     .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_community"))?;
  73
  74     let moderators = CommunityModeratorView::for_community(context.pool(), community_id)
  75       .await
  76       .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_community"))?;
  77
  78     let online = context
  79       .chat_server()
  80       .send(GetCommunityUsersOnline { community_id })
  81       .await?;
  82
  83     let site_id =
  84       Site::instance_actor_id_from_url(community_view.community.actor_id.clone().into());
  85     let mut site = Site::read_from_apub_id(context.pool(), &site_id.into()).await?;
  86     // no need to include metadata for local site (its already available through other endpoints).
  87     // this also prevents us from leaking the federation private key.
  88     if let Some(s) = &site {
  89       if s.actor_id.domain() == Some(context.settings().hostname.as_ref()) {
  90         site = None;
  91       }
  92     }
  93
  94     let community_id = community_view.community.id;
  95     let discussion_languages = CommunityLanguage::read(context.pool(), community_id).await?;
  96     let default_post_language = if let Some(user) = local_user_view {
  97       default_post_language(context.pool(), community_id, user.local_user.id).await?
  98     } else {
  99       None
 100     };
 101
 102     let res = GetCommunityResponse {
 103       community_view,
 104       site,
 105       moderators,
 106       online,
 107       discussion_languages,
 108       default_post_language,
 109     };
 110
 111     // Return the jwt
 112     Ok(res)
 113   }
 114 }