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, local_site::LocalSite},
  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     let local_site = blocking(context.pool(), LocalSite::read).await??;
  32
  33     check_private_instance(&local_user_view, &local_site)?;
  34
  35     let person_id = local_user_view.map(|u| u.person.id);
  36
  37     // I'd prefer fetching the post_view by a comment join, but it adds a lot of boilerplate
  38     let post_id = if let Some(id) = data.id {
  39       id
  40     } else if let Some(comment_id) = data.comment_id {
  41       blocking(context.pool(), move |conn| Comment::read(conn, comment_id))
  42         .await?
  43         .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_post"))?
  44         .post_id
  45     } else {
  46       Err(LemmyError::from_message("couldnt_find_post"))?
  47     };
  48
  49     let mut post_view = blocking(context.pool(), move |conn| {
  50       PostView::read(conn, post_id, person_id)
  51     })
  52     .await?
  53     .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_post"))?;
  54
  55     // Mark the post as read
  56     let post_id = post_view.post.id;
  57     if let Some(person_id) = person_id {
  58       mark_post_as_read(person_id, post_id, context.pool()).await?;
  59     }
  60
  61     // Necessary for the sidebar subscribed
  62     let community_id = post_view.community.id;
  63     let mut community_view = blocking(context.pool(), move |conn| {
  64       CommunityView::read(conn, community_id, person_id)
  65     })
  66     .await?
  67     .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_community"))?;
  68
  69     // Insert into PersonPostAggregates
  70     // to update the read_comments count
  71     if let Some(person_id) = person_id {
  72       let read_comments = post_view.counts.comments;
  73       let person_post_agg_form = PersonPostAggregatesForm {
  74         person_id,
  75         post_id,
  76         read_comments,
  77         ..PersonPostAggregatesForm::default()
  78       };
  79       blocking(context.pool(), move |conn| {
  80         PersonPostAggregates::upsert(conn, &person_post_agg_form)
  81       })
  82       .await?
  83       .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_post"))?;
  84     }
  85
  86     // Blank out deleted or removed info for non-logged in users
  87     if person_id.is_none() {
  88       if post_view.post.deleted || post_view.post.removed {
  89         post_view.post = post_view.post.blank_out_deleted_or_removed_info();
  90       }
  91
  92       if community_view.community.deleted || community_view.community.removed {
  93         community_view.community = community_view.community.blank_out_deleted_or_removed_info();
  94       }
  95     }
  96
  97     let moderators = blocking(context.pool(), move |conn| {
  98       CommunityModeratorView::for_community(conn, community_id)
  99     })
 100     .await??;
 101
 102     let online = context
 103       .chat_server()
 104       .send(GetPostUsersOnline { post_id })
 105       .await
 106       .unwrap_or(1);
 107
 108     // Return the jwt
 109     Ok(GetPostResponse {
 110       post_view,
 111       community_view,
 112       moderators,
 113       online,
 114     })
 115   }
 116 }