lemmy/crates/api/src/post/like.rs

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use crate::Perform;
use actix_web::web::Data;
use lemmy_api_common::{
post::{CreatePostLike, PostResponse},
utils::{
blocking,
check_community_ban,
check_community_deleted_or_removed,
check_downvotes_enabled,
get_local_user_view_from_jwt,
mark_post_as_read,
},
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};
use lemmy_apub::{
fetcher::post_or_comment::PostOrComment,
objects::post::ApubPost,
protocol::activities::voting::{
undo_vote::UndoVote,
vote::{Vote, VoteType},
},
};
use lemmy_db_schema::{
source::post::{Post, PostLike, PostLikeForm},
traits::{Crud, Likeable},
};
use lemmy_utils::{error::LemmyError, ConnectionId};
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use lemmy_websocket::{send::send_post_ws_message, LemmyContext, UserOperation};
#[async_trait::async_trait(?Send)]
impl Perform for CreatePostLike {
type Response = PostResponse;
#[tracing::instrument(skip(context, websocket_id))]
async fn perform(
&self,
context: &Data<LemmyContext>,
websocket_id: Option<ConnectionId>,
) -> Result<PostResponse, LemmyError> {
let data: &CreatePostLike = self;
let local_user_view =
get_local_user_view_from_jwt(&data.auth, context.pool(), context.secret()).await?;
// Don't do a downvote if site has downvotes disabled
check_downvotes_enabled(data.score, context.pool()).await?;
// Check for a community ban
let post_id = data.post_id;
let post: ApubPost = blocking(context.pool(), move |conn| Post::read(conn, post_id))
.await??
.into();
check_community_ban(local_user_view.person.id, post.community_id, context.pool()).await?;
check_community_deleted_or_removed(post.community_id, context.pool()).await?;
let like_form = PostLikeForm {
post_id: data.post_id,
person_id: local_user_view.person.id,
score: data.score,
};
// Remove any likes first
let person_id = local_user_view.person.id;
blocking(context.pool(), move |conn| {
PostLike::remove(conn, person_id, post_id)
})
.await??;
let community_id = post.community_id;
let object = PostOrComment::Post(Box::new(post));
// Only add the like if the score isnt 0
let do_add = like_form.score != 0 && (like_form.score == 1 || like_form.score == -1);
if do_add {
let like_form2 = like_form.clone();
let like = move |conn: &'_ _| PostLike::like(conn, &like_form2);
blocking(context.pool(), like)
.await?
.map_err(|e| LemmyError::from_error_message(e, "couldnt_like_post"))?;
Vote::send(
&object,
&local_user_view.person.clone().into(),
community_id,
like_form.score.try_into()?,
context,
)
.await?;
} else {
// API doesn't distinguish between Undo/Like and Undo/Dislike
UndoVote::send(
&object,
&local_user_view.person.clone().into(),
community_id,
VoteType::Like,
context,
)
.await?;
}
// Mark the post as read
mark_post_as_read(person_id, post_id, context.pool()).await?;
send_post_ws_message(
data.post_id,
UserOperation::CreatePostLike,
websocket_id,
Some(local_user_view.person.id),
context,
)
.await
}
}