crates/api_crud/src/post/read.rs

   1 use crate::PerformCrud;
   2 use actix_web::web::Data;
   3 use lemmy_api_common::{
   4   post::{GetPost, GetPostResponse},
   5   utils::{blocking, check_private_instance, get_local_user_view_from_jwt_opt, mark_post_as_read},
   6 };
   7 use lemmy_db_schema::{
   8   aggregates::structs::{PersonPostAggregates, PersonPostAggregatesForm},
   9   source::comment::Comment,
  10   traits::{Crud, DeleteableOrRemoveable},
  11 };
  12 use lemmy_db_views::structs::PostView;
  13 use lemmy_db_views_actor::structs::{CommunityModeratorView, CommunityView};
  14 use lemmy_utils::{error::LemmyError, ConnectionId};
  15 use lemmy_websocket::{messages::GetPostUsersOnline, LemmyContext};
  16
  17 #[async_trait::async_trait(?Send)]
  18 impl PerformCrud for GetPost {
  19   type Response = GetPostResponse;
  20
  21   #[tracing::instrument(skip(context, _websocket_id))]
  22   async fn perform(
  23     &self,
  24     context: &Data<LemmyContext>,
  25     _websocket_id: Option<ConnectionId>,
  26   ) -> Result<GetPostResponse, LemmyError> {
  27     let data: &GetPost = self;
  28     let local_user_view =
  29       get_local_user_view_from_jwt_opt(data.auth.as_ref(), context.pool(), context.secret())
  30         .await?;
  31
  32     check_private_instance(&local_user_view, context.pool()).await?;
  33
  34     let person_id = local_user_view.map(|u| u.person.id);
  35
  36     // I'd prefer fetching the post_view by a comment join, but it adds a lot of boilerplate
  37     let post_id = if let Some(id) = data.id {
  38       id
  39     } else if let Some(comment_id) = data.comment_id {
  40       blocking(context.pool(), move |conn| Comment::read(conn, comment_id))
  41         .await?
  42         .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_post"))?
  43         .post_id
  44     } else {
  45       Err(LemmyError::from_message("couldnt_find_post"))?
  46     };
  47
  48     let mut post_view = blocking(context.pool(), move |conn| {
  49       PostView::read(conn, post_id, person_id)
  50     })
  51     .await?
  52     .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_post"))?;
  53
  54     // Mark the post as read
  55     let post_id = post_view.post.id;
  56     if let Some(person_id) = person_id {
  57       mark_post_as_read(person_id, post_id, context.pool()).await?;
  58     }
  59
  60     // Necessary for the sidebar subscribed
  61     let community_id = post_view.community.id;
  62     let mut community_view = blocking(context.pool(), move |conn| {
  63       CommunityView::read(conn, community_id, person_id)
  64     })
  65     .await?
  66     .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_community"))?;
  67
  68     // Insert into PersonPostAggregates
  69     // to update the read_comments count
  70     if let Some(person_id) = person_id {
  71       let read_comments = post_view.counts.comments;
  72       let person_post_agg_form = PersonPostAggregatesForm {
  73         person_id,
  74         post_id,
  75         read_comments,
  76         ..PersonPostAggregatesForm::default()
  77       };
  78       blocking(context.pool(), move |conn| {
  79         PersonPostAggregates::upsert(conn, &person_post_agg_form)
  80       })
  81       .await?
  82       .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_post"))?;
  83     }
  84
  85     // Blank out deleted or removed info for non-logged in users
  86     if person_id.is_none() {
  87       if post_view.post.deleted || post_view.post.removed {
  88         post_view.post = post_view.post.blank_out_deleted_or_removed_info();
  89       }
  90
  91       if community_view.community.deleted || community_view.community.removed {
  92         community_view.community = community_view.community.blank_out_deleted_or_removed_info();
  93       }
  94     }
  95
  96     let moderators = blocking(context.pool(), move |conn| {
  97       CommunityModeratorView::for_community(conn, community_id)
  98     })
  99     .await??;
 100
 101     let online = context
 102       .chat_server()
 103       .send(GetPostUsersOnline { post_id })
 104       .await
 105       .unwrap_or(1);
 106
 107     // Return the jwt
 108     Ok(GetPostResponse {
 109       post_view,
 110       community_view,
 111       moderators,
 112       online,
 113     })
 114   }
 115 }