crates/api/src/post/like.rs

   1 use crate::Perform;
   2 use actix_web::web::Data;
   3 use lemmy_api_common::{
   4   post::{CreatePostLike, PostResponse},
   5   utils::{
   6     check_community_ban,
   7     check_community_deleted_or_removed,
   8     check_downvotes_enabled,
   9     get_local_user_view_from_jwt,
  10     mark_post_as_read,
  11   },
  12 };
  13 use lemmy_apub::{
  14   fetcher::post_or_comment::PostOrComment,
  15   objects::post::ApubPost,
  16   protocol::activities::voting::{
  17     undo_vote::UndoVote,
  18     vote::{Vote, VoteType},
  19   },
  20 };
  21 use lemmy_db_schema::{
  22   source::{
  23     local_site::LocalSite,
  24     post::{Post, PostLike, PostLikeForm},
  25   },
  26   traits::{Crud, Likeable},
  27 };
  28 use lemmy_utils::{error::LemmyError, ConnectionId};
  29 use lemmy_websocket::{send::send_post_ws_message, LemmyContext, UserOperation};
  30
  31 #[async_trait::async_trait(?Send)]
  32 impl Perform for CreatePostLike {
  33   type Response = PostResponse;
  34
  35   #[tracing::instrument(skip(context, websocket_id))]
  36   async fn perform(
  37     &self,
  38     context: &Data<LemmyContext>,
  39     websocket_id: Option<ConnectionId>,
  40   ) -> Result<PostResponse, LemmyError> {
  41     let data: &CreatePostLike = self;
  42     let local_user_view =
  43       get_local_user_view_from_jwt(&data.auth, context.pool(), context.secret()).await?;
  44     let local_site = LocalSite::read(context.pool()).await?;
  45
  46     // Don't do a downvote if site has downvotes disabled
  47     check_downvotes_enabled(data.score, &local_site)?;
  48
  49     // Check for a community ban
  50     let post_id = data.post_id;
  51     let post: ApubPost = Post::read(context.pool(), post_id).await?.into();
  52
  53     check_community_ban(local_user_view.person.id, post.community_id, context.pool()).await?;
  54     check_community_deleted_or_removed(post.community_id, context.pool()).await?;
  55
  56     let like_form = PostLikeForm {
  57       post_id: data.post_id,
  58       person_id: local_user_view.person.id,
  59       score: data.score,
  60     };
  61
  62     // Remove any likes first
  63     let person_id = local_user_view.person.id;
  64
  65     PostLike::remove(context.pool(), person_id, post_id).await?;
  66
  67     let community_id = post.community_id;
  68     let object = PostOrComment::Post(Box::new(post));
  69
  70     // Only add the like if the score isnt 0
  71     let do_add = like_form.score != 0 && (like_form.score == 1 || like_form.score == -1);
  72     if do_add {
  73       let like_form2 = like_form.clone();
  74       PostLike::like(context.pool(), &like_form2)
  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 }