crates/apub/src/collections/community_outbox.rs

   1 use crate::{
   2   activity_lists::AnnouncableActivities,
   3   collections::CommunityContext,
   4   objects::post::ApubPost,
   5   protocol::{
   6     activities::{
   7       community::announce::AnnounceActivity,
   8       create_or_update::page::CreateOrUpdatePage,
   9       CreateOrUpdateType,
  10     },
  11     collections::group_outbox::GroupOutbox,
  12   },
  13 };
  14 use activitypub_federation::{
  15   data::Data,
  16   traits::{ActivityHandler, ApubObject},
  17   utils::verify_domains_match,
  18 };
  19 use activitystreams_kinds::collection::OrderedCollectionType;
  20 use chrono::NaiveDateTime;
  21 use futures::future::join_all;
  22 use lemmy_api_common::utils::generate_outbox_url;
  23 use lemmy_db_schema::{
  24   source::{person::Person, post::Post},
  25   traits::Crud,
  26 };
  27 use lemmy_utils::error::LemmyError;
  28 use url::Url;
  29
  30 #[derive(Clone, Debug)]
  31 pub(crate) struct ApubCommunityOutbox(Vec<ApubPost>);
  32
  33 #[async_trait::async_trait(?Send)]
  34 impl ApubObject for ApubCommunityOutbox {
  35   type DataType = CommunityContext;
  36   type ApubType = GroupOutbox;
  37   type Error = LemmyError;
  38
  39   fn last_refreshed_at(&self) -> Option<NaiveDateTime> {
  40     None
  41   }
  42
  43   #[tracing::instrument(skip_all)]
  44   async fn read_from_apub_id(
  45     _object_id: Url,
  46     data: &Self::DataType,
  47   ) -> Result<Option<Self>, LemmyError> {
  48     // Only read from database if its a local community, otherwise fetch over http
  49     if data.0.local {
  50       let community_id = data.0.id;
  51       let post_list: Vec<ApubPost> = Post::list_for_community(data.1.pool(), community_id)
  52         .await?
  53         .into_iter()
  54         .map(Into::into)
  55         .collect();
  56       Ok(Some(ApubCommunityOutbox(post_list)))
  57     } else {
  58       Ok(None)
  59     }
  60   }
  61
  62   async fn delete(self, _data: &Self::DataType) -> Result<(), LemmyError> {
  63     // do nothing (it gets deleted automatically with the community)
  64     Ok(())
  65   }
  66
  67   #[tracing::instrument(skip_all)]
  68   async fn into_apub(self, data: &Self::DataType) -> Result<Self::ApubType, LemmyError> {
  69     let mut ordered_items = vec![];
  70     for post in self.0 {
  71       let person = Person::read(data.1.pool(), post.creator_id).await?.into();
  72       let create =
  73         CreateOrUpdatePage::new(post, &person, &data.0, CreateOrUpdateType::Create, &data.1)
  74           .await?;
  75       let announcable = AnnouncableActivities::CreateOrUpdatePost(create);
  76       let announce = AnnounceActivity::new(announcable.try_into()?, &data.0, &data.1)?;
  77       ordered_items.push(announce);
  78     }
  79
  80     Ok(GroupOutbox {
  81       r#type: OrderedCollectionType::OrderedCollection,
  82       id: generate_outbox_url(&data.0.actor_id)?.into(),
  83       total_items: ordered_items.len() as i32,
  84       ordered_items,
  85     })
  86   }
  87
  88   #[tracing::instrument(skip_all)]
  89   async fn verify(
  90     group_outbox: &GroupOutbox,
  91     expected_domain: &Url,
  92     _context: &CommunityContext,
  93     _request_counter: &mut i32,
  94   ) -> Result<(), LemmyError> {
  95     verify_domains_match(expected_domain, &group_outbox.id)?;
  96     Ok(())
  97   }
  98
  99   #[tracing::instrument(skip_all)]
 100   async fn from_apub(
 101     apub: Self::ApubType,
 102     data: &Self::DataType,
 103     _request_counter: &mut i32,
 104   ) -> Result<Self, LemmyError> {
 105     let mut outbox_activities = apub.ordered_items;
 106     if outbox_activities.len() > 20 {
 107       outbox_activities = outbox_activities[0..20].to_vec();
 108     }
 109
 110     // We intentionally ignore errors here. This is because the outbox might contain posts from old
 111     // Lemmy versions, or from other software which we cant parse. In that case, we simply skip the
 112     // item and only parse the ones that work.
 113     let data = Data::new(data.1.clone());
 114     // process items in parallel, to avoid long delay from fetch_site_metadata() and other processing
 115     join_all(outbox_activities.into_iter().map(|activity| {
 116       async {
 117         // use separate request counter for each item, otherwise there will be problems with
 118         // parallel processing
 119         let request_counter = &mut 0;
 120         let verify = activity.verify(&data, request_counter).await;
 121         if verify.is_ok() {
 122           activity.receive(&data, request_counter).await.ok();
 123         }
 124       }
 125     }))
 126     .await;
 127
 128     // This return value is unused, so just set an empty vec
 129     Ok(ApubCommunityOutbox(Vec::new()))
 130   }
 131
 132   type DbType = ();
 133 }