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     get_local_user_view_from_jwt_opt,
   9     is_mod_or_admin_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 =
  35       get_local_user_view_from_jwt_opt(data.auth.as_ref(), context.pool(), context.secret())
  36         .await?;
  37     let local_site = LocalSite::read(context.pool()).await?;
  38
  39     check_private_instance(&local_user_view, &local_site)?;
  40
  41     let person_id = local_user_view.as_ref().map(|u| u.person.id);
  42
  43     // I'd prefer fetching the post_view by a comment join, but it adds a lot of boilerplate
  44     let post_id = if let Some(id) = data.id {
  45       id
  46     } else if let Some(comment_id) = data.comment_id {
  47       Comment::read(context.pool(), comment_id)
  48         .await
  49         .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_post"))?
  50         .post_id
  51     } else {
  52       Err(LemmyError::from_message("couldnt_find_post"))?
  53     };
  54
  55     // Check to see if the person is a mod or admin, to show deleted / removed
  56     let community_id = Post::read(context.pool(), post_id).await?.community_id;
  57     let is_mod_or_admin =
  58       is_mod_or_admin_opt(context.pool(), local_user_view.as_ref(), Some(community_id))
  59         .await
  60         .is_ok();
  61
  62     let post_view = PostView::read(context.pool(), post_id, person_id, Some(is_mod_or_admin))
  63       .await
  64       .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_post"))?;
  65
  66     // Mark the post as read
  67     let post_id = post_view.post.id;
  68     if let Some(person_id) = person_id {
  69       mark_post_as_read(person_id, post_id, context.pool()).await?;
  70     }
  71
  72     // Necessary for the sidebar subscribed
  73     let community_view = CommunityView::read(
  74       context.pool(),
  75       community_id,
  76       person_id,
  77       Some(is_mod_or_admin),
  78     )
  79     .await
  80     .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_community"))?;
  81
  82     // Insert into PersonPostAggregates
  83     // to update the read_comments count
  84     if let Some(person_id) = person_id {
  85       let read_comments = post_view.counts.comments;
  86       let person_post_agg_form = PersonPostAggregatesForm {
  87         person_id,
  88         post_id,
  89         read_comments,
  90         ..PersonPostAggregatesForm::default()
  91       };
  92       PersonPostAggregates::upsert(context.pool(), &person_post_agg_form)
  93         .await
  94         .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_post"))?;
  95     }
  96
  97     let moderators = CommunityModeratorView::for_community(context.pool(), community_id).await?;
  98
  99     // Fetch the cross_posts
 100     let cross_posts = if let Some(url) = &post_view.post.url {
 101       PostQuery::builder()
 102         .pool(context.pool())
 103         .url_search(Some(url.inner().as_str().into()))
 104         .build()
 105         .list()
 106         .await?
 107     } else {
 108       Vec::new()
 109     };
 110
 111     let online = context
 112       .chat_server()
 113       .send(GetPostUsersOnline { post_id })
 114       .await?;
 115
 116     // Return the jwt
 117     Ok(GetPostResponse {
 118       post_view,
 119       community_view,
 120       moderators,
 121       online,
 122       cross_posts,
 123     })
 124   }
 125 }