crates/api/src/post/like.rs

   1 use crate::Perform;
   2 use actix_web::web::Data;
   3 use lemmy_api_common::{
   4   blocking,
   5   check_community_ban,
   6   check_community_deleted_or_removed,
   7   check_downvotes_enabled,
   8   get_local_user_view_from_jwt,
   9   mark_post_as_read,
  10   post::{CreatePostLike, PostResponse},
  11 };
  12 use lemmy_apub::{
  13   fetcher::post_or_comment::PostOrComment,
  14   objects::post::ApubPost,
  15   protocol::activities::voting::{
  16     undo_vote::UndoVote,
  17     vote::{Vote, VoteType},
  18   },
  19 };
  20 use lemmy_db_schema::{
  21   source::post::{Post, PostLike, PostLikeForm},
  22   traits::{Crud, Likeable},
  23 };
  24 use lemmy_utils::{ConnectionId, LemmyError};
  25 use lemmy_websocket::{send::send_post_ws_message, LemmyContext, UserOperation};
  26
  27 #[async_trait::async_trait(?Send)]
  28 impl Perform for CreatePostLike {
  29   type Response = PostResponse;
  30
  31   #[tracing::instrument(skip(context, websocket_id))]
  32   async fn perform(
  33     &self,
  34     context: &Data<LemmyContext>,
  35     websocket_id: Option<ConnectionId>,
  36   ) -> Result<PostResponse, LemmyError> {
  37     let data: &CreatePostLike = self;
  38     let local_user_view =
  39       get_local_user_view_from_jwt(&data.auth, context.pool(), context.secret()).await?;
  40
  41     // Don't do a downvote if site has downvotes disabled
  42     check_downvotes_enabled(data.score, context.pool()).await?;
  43
  44     // Check for a community ban
  45     let post_id = data.post_id;
  46     let post: ApubPost = blocking(context.pool(), move |conn| Post::read(conn, post_id))
  47       .await??
  48       .into();
  49
  50     check_community_ban(local_user_view.person.id, post.community_id, context.pool()).await?;
  51     check_community_deleted_or_removed(post.community_id, context.pool()).await?;
  52
  53     let like_form = PostLikeForm {
  54       post_id: data.post_id,
  55       person_id: local_user_view.person.id,
  56       score: data.score,
  57     };
  58
  59     // Remove any likes first
  60     let person_id = local_user_view.person.id;
  61     blocking(context.pool(), move |conn| {
  62       PostLike::remove(conn, person_id, post_id)
  63     })
  64     .await??;
  65
  66     let community_id = post.community_id;
  67     let object = PostOrComment::Post(Box::new(post));
  68
  69     // Only add the like if the score isnt 0
  70     let do_add = like_form.score != 0 && (like_form.score == 1 || like_form.score == -1);
  71     if do_add {
  72       let like_form2 = like_form.clone();
  73       let like = move |conn: &'_ _| PostLike::like(conn, &like_form2);
  74       blocking(context.pool(), like)
  75         .await?
  76         .map_err(|e| LemmyError::from_error_message(e, "couldnt_like_post"))?;
  77
  78       Vote::send(
  79         &object,
  80         &local_user_view.person.clone().into(),
  81         community_id,
  82         like_form.score.try_into()?,
  83         context,
  84       )
  85       .await?;
  86     } else {
  87       // API doesn't distinguish between Undo/Like and Undo/Dislike
  88       UndoVote::send(
  89         &object,
  90         &local_user_view.person.clone().into(),
  91         community_id,
  92         VoteType::Like,
  93         context,
  94       )
  95       .await?;
  96     }
  97
  98     // Mark the post as read
  99     mark_post_as_read(person_id, post_id, context.pool()).await?;
 100
 101     send_post_ws_message(
 102       data.post_id,
 103       UserOperation::CreatePostLike,
 104       websocket_id,
 105       Some(local_user_view.person.id),
 106       context,
 107     )
 108     .await
 109   }
 110 }