crates/api_crud/src/community/read.rs

   1 use crate::PerformCrud;
   2 use actix_web::web::Data;
   3 use lemmy_api_common::{
   4   community::{GetCommunity, GetCommunityResponse},
   5   utils::{blocking, check_private_instance, get_local_user_view_from_jwt_opt},
   6 };
   7 use lemmy_apub::{
   8   fetcher::resolve_actor_identifier,
   9   objects::{community::ApubCommunity, instance::instance_actor_id_from_url},
  10 };
  11 use lemmy_db_schema::{
  12   source::{community::Community, site::Site},
  13   traits::DeleteableOrRemoveable,
  14 };
  15 use lemmy_db_views_actor::structs::{CommunityModeratorView, CommunityView};
  16 use lemmy_utils::{error::LemmyError, ConnectionId};
  17 use lemmy_websocket::{messages::GetCommunityUsersOnline, LemmyContext};
  18
  19 #[async_trait::async_trait(?Send)]
  20 impl PerformCrud for GetCommunity {
  21   type Response = GetCommunityResponse;
  22
  23   #[tracing::instrument(skip(context, _websocket_id))]
  24   async fn perform(
  25     &self,
  26     context: &Data<LemmyContext>,
  27     _websocket_id: Option<ConnectionId>,
  28   ) -> Result<GetCommunityResponse, LemmyError> {
  29     let data: &GetCommunity = self;
  30     let local_user_view =
  31       get_local_user_view_from_jwt_opt(data.auth.as_ref(), context.pool(), context.secret())
  32         .await?;
  33
  34     if data.name.is_none() && data.id.is_none() {
  35       return Err(LemmyError::from_message("no_id_given"));
  36     }
  37
  38     check_private_instance(&local_user_view, context.pool()).await?;
  39
  40     let person_id = local_user_view.map(|u| u.person.id);
  41
  42     let community_id = match data.id {
  43       Some(id) => id,
  44       None => {
  45         let name = data.name.to_owned().unwrap_or_else(|| "main".to_string());
  46         resolve_actor_identifier::<ApubCommunity, Community>(&name, context, true)
  47           .await
  48           .map_err(|e| e.with_message("couldnt_find_community"))?
  49           .id
  50       }
  51     };
  52
  53     let mut community_view = blocking(context.pool(), move |conn| {
  54       CommunityView::read(conn, community_id, person_id)
  55     })
  56     .await?
  57     .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_community"))?;
  58
  59     // Blank out deleted or removed info for non-logged in users
  60     if person_id.is_none() && (community_view.community.deleted || community_view.community.removed)
  61     {
  62       community_view.community = community_view.community.blank_out_deleted_or_removed_info();
  63     }
  64
  65     let moderators: Vec<CommunityModeratorView> = blocking(context.pool(), move |conn| {
  66       CommunityModeratorView::for_community(conn, community_id)
  67     })
  68     .await?
  69     .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_community"))?;
  70
  71     let online = context
  72       .chat_server()
  73       .send(GetCommunityUsersOnline { community_id })
  74       .await
  75       .unwrap_or(1);
  76
  77     let site_id = instance_actor_id_from_url(community_view.community.actor_id.clone().into());
  78     let mut site: Option<Site> = blocking(context.pool(), move |conn| {
  79       Site::read_from_apub_id(conn, site_id)
  80     })
  81     .await??;
  82     // no need to include metadata for local site (its already available through other endpoints).
  83     // this also prevents us from leaking the federation private key.
  84     if let Some(s) = &site {
  85       if s.actor_id.domain() == Some(context.settings().hostname.as_ref()) {
  86         site = None;
  87       }
  88     }
  89
  90     let res = GetCommunityResponse {
  91       community_view,
  92       site,
  93       moderators,
  94       online,
  95     };
  96
  97     // Return the jwt
  98     Ok(res)
  99   }
 100 }