crates/apub/src/activities/voting/vote.rs

   1 use crate::{
   2   activities::{
   3     community::{announce::GetCommunity, send_activity_in_community},
   4     generate_activity_id,
   5     verify_person_in_community,
   6     voting::{vote_comment, vote_post},
   7   },
   8   activity_lists::AnnouncableActivities,
   9   check_apub_id_valid,
  10   fetch_local_site_data,
  11   local_instance,
  12   objects::{community::ApubCommunity, person::ApubPerson},
  13   protocol::activities::voting::vote::{Vote, VoteType},
  14   ActorType,
  15   PostOrComment,
  16 };
  17 use activitypub_federation::{core::object_id::ObjectId, data::Data, traits::ActivityHandler};
  18 use anyhow::anyhow;
  19 use lemmy_api_common::utils::blocking;
  20 use lemmy_db_schema::{
  21   newtypes::CommunityId,
  22   source::{community::Community, local_site::LocalSite, post::Post},
  23   traits::Crud,
  24 };
  25 use lemmy_utils::error::LemmyError;
  26 use lemmy_websocket::LemmyContext;
  27 use url::Url;
  28
  29 /// Vote has as:Public value in cc field, unlike other activities. This indicates to other software
  30 /// (like GNU social, or presumably Mastodon), that the like actor should not be disclosed.
  31 impl Vote {
  32   pub(in crate::activities::voting) fn new(
  33     object: &PostOrComment,
  34     actor: &ApubPerson,
  35     kind: VoteType,
  36     context: &LemmyContext,
  37   ) -> Result<Vote, LemmyError> {
  38     Ok(Vote {
  39       actor: ObjectId::new(actor.actor_id()),
  40       object: ObjectId::new(object.ap_id()),
  41       kind: kind.clone(),
  42       id: generate_activity_id(kind, &context.settings().get_protocol_and_hostname())?,
  43       unparsed: Default::default(),
  44     })
  45   }
  46
  47   #[tracing::instrument(skip_all)]
  48   pub async fn send(
  49     object: &PostOrComment,
  50     actor: &ApubPerson,
  51     community_id: CommunityId,
  52     kind: VoteType,
  53     context: &LemmyContext,
  54   ) -> Result<(), LemmyError> {
  55     let community = blocking(context.pool(), move |conn| {
  56       Community::read(conn, community_id)
  57     })
  58     .await??
  59     .into();
  60     let vote = Vote::new(object, actor, kind, context)?;
  61
  62     let activity = AnnouncableActivities::Vote(vote);
  63     send_activity_in_community(activity, actor, &community, vec![], context).await
  64   }
  65 }
  66
  67 #[async_trait::async_trait(?Send)]
  68 impl ActivityHandler for Vote {
  69   type DataType = LemmyContext;
  70   type Error = LemmyError;
  71
  72   fn id(&self) -> &Url {
  73     &self.id
  74   }
  75
  76   fn actor(&self) -> &Url {
  77     self.actor.inner()
  78   }
  79
  80   #[tracing::instrument(skip_all)]
  81   async fn verify(
  82     &self,
  83     context: &Data<LemmyContext>,
  84     request_counter: &mut i32,
  85   ) -> Result<(), LemmyError> {
  86     let local_site_data = blocking(context.pool(), fetch_local_site_data).await??;
  87     check_apub_id_valid(self.id(), &local_site_data, context.settings())
  88       .map_err(LemmyError::from_message)?;
  89     let community = self.get_community(context, request_counter).await?;
  90     verify_person_in_community(&self.actor, &community, context, request_counter).await?;
  91     let enable_downvotes = blocking(context.pool(), LocalSite::read)
  92       .await?
  93       .map(|l| l.enable_downvotes)
  94       .unwrap_or(true);
  95     if self.kind == VoteType::Dislike && !enable_downvotes {
  96       return Err(anyhow!("Downvotes disabled").into());
  97     }
  98     Ok(())
  99   }
 100
 101   #[tracing::instrument(skip_all)]
 102   async fn receive(
 103     self,
 104     context: &Data<LemmyContext>,
 105     request_counter: &mut i32,
 106   ) -> Result<(), LemmyError> {
 107     let actor = self
 108       .actor
 109       .dereference(context, local_instance(context), request_counter)
 110       .await?;
 111     let object = self
 112       .object
 113       .dereference(context, local_instance(context), request_counter)
 114       .await?;
 115     match object {
 116       PostOrComment::Post(p) => vote_post(&self.kind, actor, &p, context).await,
 117       PostOrComment::Comment(c) => vote_comment(&self.kind, actor, &c, context).await,
 118     }
 119   }
 120 }
 121
 122 #[async_trait::async_trait(?Send)]
 123 impl GetCommunity for Vote {
 124   #[tracing::instrument(skip_all)]
 125   async fn get_community(
 126     &self,
 127     context: &LemmyContext,
 128     request_counter: &mut i32,
 129   ) -> Result<ApubCommunity, LemmyError> {
 130     let object = self
 131       .object
 132       .dereference(context, local_instance(context), request_counter)
 133       .await?;
 134     let cid = match object {
 135       PostOrComment::Post(p) => p.community_id,
 136       PostOrComment::Comment(c) => {
 137         blocking(context.pool(), move |conn| Post::read(conn, c.post_id))
 138           .await??
 139           .community_id
 140       }
 141     };
 142     let community = blocking(context.pool(), move |conn| Community::read(conn, cid)).await??;
 143     Ok(community.into())
 144   }
 145 }