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_api_common::utils::blocking;
  23 use lemmy_db_schema::{
  24   source::{
  25     community::Community,
  26     post::{PostLike, PostLikeForm},
  27   },
  28   traits::{Crud, Likeable},
  29 };
  30 use lemmy_utils::error::LemmyError;
  31 use lemmy_websocket::{send::send_post_ws_message, LemmyContext, UserOperationCrud};
  32 use url::Url;
  33
  34 impl CreateOrUpdatePost {
  35   pub(crate) async fn new(
  36     post: ApubPost,
  37     actor: &ApubPerson,
  38     community: &ApubCommunity,
  39     kind: CreateOrUpdateType,
  40     context: &LemmyContext,
  41   ) -> Result<CreateOrUpdatePost, LemmyError> {
  42     let id = generate_activity_id(
  43       kind.clone(),
  44       &context.settings().get_protocol_and_hostname(),
  45     )?;
  46     Ok(CreateOrUpdatePost {
  47       actor: ObjectId::new(actor.actor_id()),
  48       to: vec![public()],
  49       object: post.into_apub(context).await?,
  50       cc: vec![community.actor_id()],
  51       kind,
  52       id: id.clone(),
  53       unparsed: Default::default(),
  54     })
  55   }
  56
  57   #[tracing::instrument(skip_all)]
  58   pub async fn send(
  59     post: ApubPost,
  60     actor: &ApubPerson,
  61     kind: CreateOrUpdateType,
  62     context: &LemmyContext,
  63   ) -> Result<(), LemmyError> {
  64     let community_id = post.community_id;
  65     let community: ApubCommunity = blocking(context.pool(), move |conn| {
  66       Community::read(conn, community_id)
  67     })
  68     .await??
  69     .into();
  70
  71     let create_or_update = CreateOrUpdatePost::new(post, actor, &community, kind, context).await?;
  72     let activity = AnnouncableActivities::CreateOrUpdatePost(Box::new(create_or_update));
  73     send_activity_in_community(activity, actor, &community, vec![], context).await
  74   }
  75 }
  76
  77 #[async_trait::async_trait(?Send)]
  78 impl ActivityHandler for CreateOrUpdatePost {
  79   type DataType = LemmyContext;
  80   type Error = LemmyError;
  81
  82   fn id(&self) -> &Url {
  83     &self.id
  84   }
  85
  86   fn actor(&self) -> &Url {
  87     self.actor.inner()
  88   }
  89
  90   #[tracing::instrument(skip_all)]
  91   async fn verify(
  92     &self,
  93     context: &Data<LemmyContext>,
  94     request_counter: &mut i32,
  95   ) -> Result<(), LemmyError> {
  96     verify_is_public(&self.to, &self.cc)?;
  97     let community = self.get_community(context, request_counter).await?;
  98     verify_person_in_community(&self.actor, &community, context, request_counter).await?;
  99     check_community_deleted_or_removed(&community)?;
 100
 101     match self.kind {
 102       CreateOrUpdateType::Create => {
 103         verify_domains_match(self.actor.inner(), self.object.id.inner())?;
 104         verify_urls_match(self.actor.inner(), self.object.creator()?.inner())?;
 105         // Check that the post isnt locked or stickied, as that isnt possible for newly created posts.
 106         // However, when fetching a remote post we generate a new create activity with the current
 107         // locked/stickied value, so this check may fail. So only check if its a local community,
 108         // because then we will definitely receive all create and update activities separately.
 109         let is_stickied_or_locked =
 110           self.object.stickied == Some(true) || self.object.comments_enabled == Some(false);
 111         if community.local && is_stickied_or_locked {
 112           return Err(LemmyError::from_message(
 113             "New post cannot be stickied or locked",
 114           ));
 115         }
 116       }
 117       CreateOrUpdateType::Update => {
 118         let is_mod_action = self.object.is_mod_action(context).await?;
 119         if is_mod_action {
 120           verify_mod_action(
 121             &self.actor,
 122             self.object.id.inner(),
 123             community.id,
 124             context,
 125             request_counter,
 126           )
 127           .await?;
 128         } else {
 129           verify_domains_match(self.actor.inner(), self.object.id.inner())?;
 130           verify_urls_match(self.actor.inner(), self.object.creator()?.inner())?;
 131         }
 132       }
 133     }
 134     ApubPost::verify(&self.object, self.actor.inner(), context, request_counter).await?;
 135     Ok(())
 136   }
 137
 138   #[tracing::instrument(skip_all)]
 139   async fn receive(
 140     self,
 141     context: &Data<LemmyContext>,
 142     request_counter: &mut i32,
 143   ) -> Result<(), LemmyError> {
 144     let post = ApubPost::from_apub(self.object, context, request_counter).await?;
 145
 146     // author likes their own post by default
 147     let like_form = PostLikeForm {
 148       post_id: post.id,
 149       person_id: post.creator_id,
 150       score: 1,
 151     };
 152     blocking(context.pool(), move |conn: &mut _| {
 153       PostLike::like(conn, &like_form)
 154     })
 155     .await??;
 156
 157     let notif_type = match self.kind {
 158       CreateOrUpdateType::Create => UserOperationCrud::CreatePost,
 159       CreateOrUpdateType::Update => UserOperationCrud::EditPost,
 160     };
 161     send_post_ws_message(post.id, notif_type, None, None, context).await?;
 162     Ok(())
 163   }
 164 }
 165
 166 #[async_trait::async_trait(?Send)]
 167 impl GetCommunity for CreateOrUpdatePost {
 168   #[tracing::instrument(skip_all)]
 169   async fn get_community(
 170     &self,
 171     context: &LemmyContext,
 172     request_counter: &mut i32,
 173   ) -> Result<ApubCommunity, LemmyError> {
 174     self
 175       .object
 176       .extract_community(context, request_counter)
 177       .await
 178   }
 179 }