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 };
  13 use lemmy_db_schema::{
  14   aggregates::structs::{PersonPostAggregates, PersonPostAggregatesForm},
  15   source::{comment::Comment, local_site::LocalSite, post::Post},
  16   traits::Crud,
  17 };
  18 use lemmy_db_views::{post_view::PostQuery, structs::PostView};
  19 use lemmy_db_views_actor::structs::{CommunityModeratorView, CommunityView};
  20 use lemmy_utils::error::LemmyError;
  21
  22 #[async_trait::async_trait(?Send)]
  23 impl PerformCrud for GetPost {
  24   type Response = GetPostResponse;
  25
  26   #[tracing::instrument(skip(context))]
  27   async fn perform(&self, context: &Data<LemmyContext>) -> Result<GetPostResponse, LemmyError> {
  28     let data: &GetPost = self;
  29     let local_user_view = local_user_view_from_jwt_opt(data.auth.as_ref(), context).await;
  30     let local_site = LocalSite::read(context.pool()).await?;
  31
  32     check_private_instance(&local_user_view, &local_site)?;
  33
  34     let person_id = local_user_view.as_ref().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       Comment::read(context.pool(), 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     // Check to see if the person is a mod or admin, to show deleted / removed
  49     let community_id = Post::read(context.pool(), post_id).await?.community_id;
  50     let is_mod_or_admin =
  51       is_mod_or_admin_opt(context.pool(), local_user_view.as_ref(), Some(community_id))
  52         .await
  53         .is_ok();
  54
  55     let post_view = PostView::read(context.pool(), post_id, person_id, Some(is_mod_or_admin))
  56       .await
  57       .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_post"))?;
  58
  59     // Mark the post as read
  60     let post_id = post_view.post.id;
  61     if let Some(person_id) = person_id {
  62       mark_post_as_read(person_id, post_id, context.pool()).await?;
  63     }
  64
  65     // Necessary for the sidebar subscribed
  66     let community_view = CommunityView::read(
  67       context.pool(),
  68       community_id,
  69       person_id,
  70       Some(is_mod_or_admin),
  71     )
  72     .await
  73     .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_community"))?;
  74
  75     // Insert into PersonPostAggregates
  76     // to update the read_comments count
  77     if let Some(person_id) = person_id {
  78       let read_comments = post_view.counts.comments;
  79       let person_post_agg_form = PersonPostAggregatesForm {
  80         person_id,
  81         post_id,
  82         read_comments,
  83         ..PersonPostAggregatesForm::default()
  84       };
  85       PersonPostAggregates::upsert(context.pool(), &person_post_agg_form)
  86         .await
  87         .map_err(|e| LemmyError::from_error_message(e, "couldnt_find_post"))?;
  88     }
  89
  90     let moderators = CommunityModeratorView::for_community(context.pool(), community_id).await?;
  91
  92     // Fetch the cross_posts
  93     let cross_posts = if let Some(url) = &post_view.post.url {
  94       PostQuery::builder()
  95         .pool(context.pool())
  96         .url_search(Some(url.inner().as_str().into()))
  97         .build()
  98         .list()
  99         .await?
 100     } else {
 101       Vec::new()
 102     };
 103
 104     // Return the jwt
 105     Ok(GetPostResponse {
 106       post_view,
 107       community_view,
 108       moderators,
 109       cross_posts,
 110     })
 111   }
 112 }