crates/apub/src/activities/create_or_update/post.rs

   1 use crate::{
   2   activities::{
   3     check_community_deleted_or_removed,
   4     community::{announce::GetCommunity, send_activity_in_community},
   5     generate_activity_id,
   6     verify_is_public,
   7     verify_mod_action,
   8     verify_person_in_community,
   9   },
  10   activity_lists::AnnouncableActivities,
  11   objects::{community::ApubCommunity, person::ApubPerson, post::ApubPost},
  12   protocol::activities::{create_or_update::post::CreateOrUpdatePost, CreateOrUpdateType},
  13   ActorType,
  14 };
  15 use activitypub_federation::{
  16   core::object_id::ObjectId,
  17   data::Data,
  18   traits::{ActivityHandler, ApubObject},
  19   utils::{verify_domains_match, verify_urls_match},
  20 };
  21 use activitystreams_kinds::public;
  22 use lemmy_db_schema::{
  23   source::{
  24     community::Community,
  25     post::{PostLike, PostLikeForm},
  26   },
  27   traits::{Crud, Likeable},
  28 };
  29 use lemmy_utils::error::LemmyError;
  30 use lemmy_websocket::{send::send_post_ws_message, LemmyContext, UserOperationCrud};
  31 use url::Url;
  32
  33 impl CreateOrUpdatePost {
  34   pub(crate) async fn new(
  35     post: ApubPost,
  36     actor: &ApubPerson,
  37     community: &ApubCommunity,
  38     kind: CreateOrUpdateType,
  39     context: &LemmyContext,
  40   ) -> Result<CreateOrUpdatePost, LemmyError> {
  41     let id = generate_activity_id(
  42       kind.clone(),
  43       &context.settings().get_protocol_and_hostname(),
  44     )?;
  45     Ok(CreateOrUpdatePost {
  46       actor: ObjectId::new(actor.actor_id()),
  47       to: vec![public()],
  48       object: post.into_apub(context).await?,
  49       cc: vec![community.actor_id()],
  50       kind,
  51       id: id.clone(),
  52     })
  53   }
  54
  55   #[tracing::instrument(skip_all)]
  56   pub async fn send(
  57     post: ApubPost,
  58     actor: &ApubPerson,
  59     kind: CreateOrUpdateType,
  60     context: &LemmyContext,
  61   ) -> Result<(), LemmyError> {
  62     let community_id = post.community_id;
  63     let community: ApubCommunity = Community::read(context.pool(), community_id).await?.into();
  64
  65     let create_or_update = CreateOrUpdatePost::new(post, actor, &community, kind, context).await?;
  66     let activity = AnnouncableActivities::CreateOrUpdatePost(create_or_update);
  67     send_activity_in_community(activity, actor, &community, vec![], context).await?;
  68     Ok(())
  69   }
  70 }
  71
  72 #[async_trait::async_trait(?Send)]
  73 impl ActivityHandler for CreateOrUpdatePost {
  74   type DataType = LemmyContext;
  75   type Error = LemmyError;
  76
  77   fn id(&self) -> &Url {
  78     &self.id
  79   }
  80
  81   fn actor(&self) -> &Url {
  82     self.actor.inner()
  83   }
  84
  85   #[tracing::instrument(skip_all)]
  86   async fn verify(
  87     &self,
  88     context: &Data<LemmyContext>,
  89     request_counter: &mut i32,
  90   ) -> Result<(), LemmyError> {
  91     verify_is_public(&self.to, &self.cc)?;
  92     let community = self.get_community(context, request_counter).await?;
  93     verify_person_in_community(&self.actor, &community, context, request_counter).await?;
  94     check_community_deleted_or_removed(&community)?;
  95
  96     match self.kind {
  97       CreateOrUpdateType::Create => {
  98         verify_domains_match(self.actor.inner(), self.object.id.inner())?;
  99         verify_urls_match(self.actor.inner(), self.object.creator()?.inner())?;
 100         // Check that the post isnt locked or stickied, as that isnt possible for newly created posts.
 101         // However, when fetching a remote post we generate a new create activity with the current
 102         // locked/stickied value, so this check may fail. So only check if its a local community,
 103         // because then we will definitely receive all create and update activities separately.
 104         let is_stickied_or_locked =
 105           self.object.stickied == Some(true) || self.object.comments_enabled == Some(false);
 106         if community.local && is_stickied_or_locked {
 107           return Err(LemmyError::from_message(
 108             "New post cannot be stickied or locked",
 109           ));
 110         }
 111       }
 112       CreateOrUpdateType::Update => {
 113         let is_mod_action = self.object.is_mod_action(context).await?;
 114         if is_mod_action {
 115           verify_mod_action(
 116             &self.actor,
 117             self.object.id.inner(),
 118             community.id,
 119             context,
 120             request_counter,
 121           )
 122           .await?;
 123         } else {
 124           verify_domains_match(self.actor.inner(), self.object.id.inner())?;
 125           verify_urls_match(self.actor.inner(), self.object.creator()?.inner())?;
 126         }
 127       }
 128     }
 129     ApubPost::verify(&self.object, self.actor.inner(), context, request_counter).await?;
 130     Ok(())
 131   }
 132
 133   #[tracing::instrument(skip_all)]
 134   async fn receive(
 135     self,
 136     context: &Data<LemmyContext>,
 137     request_counter: &mut i32,
 138   ) -> Result<(), LemmyError> {
 139     let post = ApubPost::from_apub(self.object, context, request_counter).await?;
 140
 141     // author likes their own post by default
 142     let like_form = PostLikeForm {
 143       post_id: post.id,
 144       person_id: post.creator_id,
 145       score: 1,
 146     };
 147     PostLike::like(context.pool(), &like_form).await?;
 148
 149     let notif_type = match self.kind {
 150       CreateOrUpdateType::Create => UserOperationCrud::CreatePost,
 151       CreateOrUpdateType::Update => UserOperationCrud::EditPost,
 152     };
 153     send_post_ws_message(post.id, notif_type, None, None, context).await?;
 154     Ok(())
 155   }
 156 }
 157
 158 #[async_trait::async_trait(?Send)]
 159 impl GetCommunity for CreateOrUpdatePost {
 160   #[tracing::instrument(skip_all)]
 161   async fn get_community(
 162     &self,
 163     context: &LemmyContext,
 164     request_counter: &mut i32,
 165   ) -> Result<ApubCommunity, LemmyError> {
 166     self
 167       .object
 168       .extract_community(context, request_counter)
 169       .await
 170   }
 171 }