crates/api_crud/src/post/read.rs

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