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::{
   7     check_private_instance,
   8     is_mod_or_admin_opt,
   9     local_user_view_from_jwt_opt,
  10     mark_post_as_read,
  11   },
  12   websocket::handlers::online_users::GetPostUsersOnline,
  13 };
  14 use lemmy_db_schema::{
  15   aggregates::structs::{PersonPostAggregates, PersonPostAggregatesForm},
  16   source::{comment::Comment, local_site::LocalSite, post::Post},
  17   traits::Crud,
  18 };
  19 use lemmy_db_views::{post_view::PostQuery, structs::PostView};
  20 use lemmy_db_views_actor::structs::{CommunityModeratorView, CommunityView};
  21 use lemmy_utils::{error::LemmyError, ConnectionId};
  22
  23 #[async_trait::async_trait(?Send)]
  24 impl PerformCrud for GetPost {
  25   type Response = GetPostResponse;
  26
  27   #[tracing::instrument(skip(context, _websocket_id))]
  28   async fn perform(
  29     &self,
  30     context: &Data<LemmyContext>,
  31     _websocket_id: Option<ConnectionId>,
  32   ) -> Result<GetPostResponse, LemmyError> {
  33     let data: &GetPost = self;
  34     let local_user_view = local_user_view_from_jwt_opt(data.auth.as_ref(), context).await;
  35     let local_site = LocalSite::read(context.pool()).await?;
  36
  37     check_private_instance(&local_user_view, &local_site)?;
  38
  39     let person_id = local_user_view.as_ref().map(|u| u.person.id);
  40
  41     // I'd prefer fetching the post_view by a comment join, but it adds a lot of boilerplate
  42     let post_id = if let Some(id) = data.id {
  43       id
  44     } else if let Some(comment_id) = data.comment_id {
  45       Comment::read(context.pool(), comment_id)
  46         .await
  47         .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_post"))?
  48         .post_id
  49     } else {
  50       Err(LemmyError::from_message("couldnt_find_post"))?
  51     };
  52
  53     // Check to see if the person is a mod or admin, to show deleted / removed
  54     let community_id = Post::read(context.pool(), post_id).await?.community_id;
  55     let is_mod_or_admin =
  56       is_mod_or_admin_opt(context.pool(), local_user_view.as_ref(), Some(community_id))
  57         .await
  58         .is_ok();
  59
  60     let post_view = PostView::read(context.pool(), post_id, person_id, Some(is_mod_or_admin))
  61       .await
  62       .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_post"))?;
  63
  64     // Mark the post as read
  65     let post_id = post_view.post.id;
  66     if let Some(person_id) = person_id {
  67       mark_post_as_read(person_id, post_id, context.pool()).await?;
  68     }
  69
  70     // Necessary for the sidebar subscribed
  71     let community_view = CommunityView::read(
  72       context.pool(),
  73       community_id,
  74       person_id,
  75       Some(is_mod_or_admin),
  76     )
  77     .await
  78     .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_community"))?;
  79
  80     // Insert into PersonPostAggregates
  81     // to update the read_comments count
  82     if let Some(person_id) = person_id {
  83       let read_comments = post_view.counts.comments;
  84       let person_post_agg_form = PersonPostAggregatesForm {
  85         person_id,
  86         post_id,
  87         read_comments,
  88         ..PersonPostAggregatesForm::default()
  89       };
  90       PersonPostAggregates::upsert(context.pool(), &person_post_agg_form)
  91         .await
  92         .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_post"))?;
  93     }
  94
  95     let moderators = CommunityModeratorView::for_community(context.pool(), community_id).await?;
  96
  97     // Fetch the cross_posts
  98     let cross_posts = if let Some(url) = &post_view.post.url {
  99       PostQuery::builder()
 100         .pool(context.pool())
 101         .url_search(Some(url.inner().as_str().into()))
 102         .build()
 103         .list()
 104         .await?
 105     } else {
 106       Vec::new()
 107     };
 108
 109     let online = context
 110       .chat_server()
 111       .send(GetPostUsersOnline { post_id })
 112       .await?;
 113
 114     // Return the jwt
 115     Ok(GetPostResponse {
 116       post_view,
 117       community_view,
 118       moderators,
 119       online,
 120       cross_posts,
 121     })
 122   }
 123 }