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   impls::actor_language::default_post_language,
  13   source::{actor_language::CommunityLanguage, community::Community, site::Site},
  14   traits::DeleteableOrRemoveable,
  15 };
  16 use lemmy_db_views_actor::structs::{CommunityModeratorView, CommunityView};
  17 use lemmy_utils::{error::LemmyError, ConnectionId};
  18 use lemmy_websocket::{messages::GetCommunityUsersOnline, LemmyContext};
  19
  20 #[async_trait::async_trait(?Send)]
  21 impl PerformCrud for GetCommunity {
  22   type Response = GetCommunityResponse;
  23
  24   #[tracing::instrument(skip(context, _websocket_id))]
  25   async fn perform(
  26     &self,
  27     context: &Data<LemmyContext>,
  28     _websocket_id: Option<ConnectionId>,
  29   ) -> Result<GetCommunityResponse, LemmyError> {
  30     let data: &GetCommunity = self;
  31     let local_user_view =
  32       get_local_user_view_from_jwt_opt(data.auth.as_ref(), context.pool(), context.secret())
  33         .await?;
  34
  35     if data.name.is_none() && data.id.is_none() {
  36       return Err(LemmyError::from_message("no_id_given"));
  37     }
  38
  39     check_private_instance(&local_user_view, context.pool()).await?;
  40
  41     let person_id = local_user_view.as_ref().map(|u| u.person.id);
  42
  43     let community_id = match data.id {
  44       Some(id) => id,
  45       None => {
  46         let name = data.name.to_owned().unwrap_or_else(|| "main".to_string());
  47         resolve_actor_identifier::<ApubCommunity, Community>(&name, context, true)
  48           .await
  49           .map_err(|e| e.with_message("couldnt_find_community"))?
  50           .id
  51       }
  52     };
  53
  54     let mut community_view = blocking(context.pool(), move |conn| {
  55       CommunityView::read(conn, community_id, person_id)
  56     })
  57     .await?
  58     .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_community"))?;
  59
  60     // Blank out deleted or removed info for non-logged in users
  61     if person_id.is_none() && (community_view.community.deleted || community_view.community.removed)
  62     {
  63       community_view.community = community_view.community.blank_out_deleted_or_removed_info();
  64     }
  65
  66     let moderators: Vec<CommunityModeratorView> = blocking(context.pool(), move |conn| {
  67       CommunityModeratorView::for_community(conn, community_id)
  68     })
  69     .await?
  70     .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_community"))?;
  71
  72     let online = context
  73       .chat_server()
  74       .send(GetCommunityUsersOnline { community_id })
  75       .await
  76       .unwrap_or(1);
  77
  78     let site_id = instance_actor_id_from_url(community_view.community.actor_id.clone().into());
  79     let mut site: Option<Site> = blocking(context.pool(), move |conn| {
  80       Site::read_from_apub_id(conn, site_id)
  81     })
  82     .await??;
  83     // no need to include metadata for local site (its already available through other endpoints).
  84     // this also prevents us from leaking the federation private key.
  85     if let Some(s) = &site {
  86       if s.actor_id.domain() == Some(context.settings().hostname.as_ref()) {
  87         site = None;
  88       }
  89     }
  90
  91     let community_id = community_view.community.id;
  92     let discussion_languages = blocking(context.pool(), move |conn| {
  93       CommunityLanguage::read(conn, community_id)
  94     })
  95     .await??;
  96     let default_post_language = if let Some(user) = local_user_view {
  97       blocking(context.pool(), move |conn| {
  98         default_post_language(conn, community_id, user.local_user.id)
  99       })
 100       .await??
 101     } else {
 102       None
 103     };
 104
 105     let res = GetCommunityResponse {
 106       community_view,
 107       site,
 108       moderators,
 109       online,
 110       discussion_languages,
 111       default_post_language,
 112     };
 113
 114     // Return the jwt
 115     Ok(res)
 116   }
 117 }