X-Git-Url: http://these/git/?a=blobdiff_plain;f=crates%2Fapub%2Fsrc%2Factivities%2Fmod.rs;h=02ad0b6b19e32f8bfbc99fa079842fd2d685301a;hb=5d23ef960e3361d1cc38c1aff1d907d8da58b90f;hp=8e25b5128b48305151602d3f7139eddaaadfbde0;hpb=a01af679488bf30a39aee6eab6b25bd98738ddcc;p=lemmy.git

diff --git a/crates/apub/src/activities/mod.rs b/crates/apub/src/activities/mod.rs
index 8e25b512..02ad0b6b 100644
--- a/crates/apub/src/activities/mod.rs
+++ b/crates/apub/src/activities/mod.rs
@@ -1,2 +1,237 @@
-pub(crate) mod receive;
-pub(crate) mod send;
+use crate::{
+  objects::{community::ApubCommunity, person::ApubPerson},
+  protocol::activities::{create_or_update::page::CreateOrUpdatePage, CreateOrUpdateType},
+  CONTEXT,
+};
+use activitypub_federation::{
+  activity_queue::send_activity,
+  config::Data,
+  fetch::object_id::ObjectId,
+  kinds::public,
+  protocol::context::WithContext,
+  traits::{ActivityHandler, Actor},
+};
+use anyhow::anyhow;
+use lemmy_api_common::{
+  context::LemmyContext,
+  send_activity::{ActivityChannel, SendActivityData},
+};
+use lemmy_db_schema::{
+  newtypes::CommunityId,
+  source::{
+    activity::{SentActivity, SentActivityForm},
+    community::Community,
+    instance::Instance,
+  },
+};
+use lemmy_db_views_actor::structs::{CommunityPersonBanView, CommunityView};
+use lemmy_utils::{
+  error::{LemmyError, LemmyErrorExt, LemmyErrorType, LemmyResult},
+  spawn_try_task,
+  SYNCHRONOUS_FEDERATION,
+};
+use moka::future::Cache;
+use once_cell::sync::Lazy;
+use serde::Serialize;
+use std::{ops::Deref, sync::Arc, time::Duration};
+use tracing::info;
+use url::{ParseError, Url};
+use uuid::Uuid;
+
+pub mod block;
+pub mod community;
+pub mod create_or_update;
+pub mod deletion;
+pub mod following;
+pub mod unfederated;
+pub mod voting;
+
+/// Amount of time that the list of dead instances is cached. This is only updated once a day,
+/// so there is no harm in caching it for a longer time.
+pub static DEAD_INSTANCE_LIST_CACHE_DURATION: Duration = Duration::from_secs(30 * 60);
+
+/// Checks that the specified Url actually identifies a Person (by fetching it), and that the person
+/// doesn't have a site ban.
+#[tracing::instrument(skip_all)]
+async fn verify_person(
+  person_id: &ObjectId<ApubPerson>,
+  context: &Data<LemmyContext>,
+) -> Result<(), LemmyError> {
+  let person = person_id.dereference(context).await?;
+  if person.banned {
+    return Err(anyhow!("Person {} is banned", person_id))
+      .with_lemmy_type(LemmyErrorType::CouldntUpdateComment);
+  }
+  Ok(())
+}
+
+/// Fetches the person and community to verify their type, then checks if person is banned from site
+/// or community.
+#[tracing::instrument(skip_all)]
+pub(crate) async fn verify_person_in_community(
+  person_id: &ObjectId<ApubPerson>,
+  community: &ApubCommunity,
+  context: &Data<LemmyContext>,
+) -> Result<(), LemmyError> {
+  let person = person_id.dereference(context).await?;
+  if person.banned {
+    return Err(LemmyErrorType::PersonIsBannedFromSite)?;
+  }
+  let person_id = person.id;
+  let community_id = community.id;
+  let is_banned = CommunityPersonBanView::get(&mut context.pool(), person_id, community_id)
+    .await
+    .is_ok();
+  if is_banned {
+    return Err(LemmyErrorType::PersonIsBannedFromCommunity)?;
+  }
+
+  Ok(())
+}
+
+/// Verify that mod action in community was performed by a moderator.
+///
+/// * `mod_id` - Activitypub ID of the mod or admin who performed the action
+/// * `object_id` - Activitypub ID of the actor or object that is being moderated
+/// * `community` - The community inside which moderation is happening
+#[tracing::instrument(skip_all)]
+pub(crate) async fn verify_mod_action(
+  mod_id: &ObjectId<ApubPerson>,
+  object_id: &Url,
+  community_id: CommunityId,
+  context: &Data<LemmyContext>,
+) -> Result<(), LemmyError> {
+  let mod_ = mod_id.dereference(context).await?;
+
+  let is_mod_or_admin =
+    CommunityView::is_mod_or_admin(&mut context.pool(), mod_.id, community_id).await?;
+  if is_mod_or_admin {
+    return Ok(());
+  }
+
+  // mod action comes from the same instance as the moderated object, so it was presumably done
+  // by an instance admin.
+  // TODO: federate instance admin status and check it here
+  if mod_id.inner().domain() == object_id.domain() {
+    return Ok(());
+  }
+
+  Err(LemmyErrorType::NotAModerator)?
+}
+
+pub(crate) fn verify_is_public(to: &[Url], cc: &[Url]) -> Result<(), LemmyError> {
+  if ![to, cc].iter().any(|set| set.contains(&public())) {
+    return Err(LemmyErrorType::ObjectIsNotPublic)?;
+  }
+  Ok(())
+}
+
+pub(crate) fn verify_community_matches<T>(
+  a: &ObjectId<ApubCommunity>,
+  b: T,
+) -> Result<(), LemmyError>
+where
+  T: Into<ObjectId<ApubCommunity>>,
+{
+  let b: ObjectId<ApubCommunity> = b.into();
+  if a != &b {
+    return Err(LemmyErrorType::InvalidCommunity)?;
+  }
+  Ok(())
+}
+
+pub(crate) fn check_community_deleted_or_removed(community: &Community) -> Result<(), LemmyError> {
+  if community.deleted || community.removed {
+    Err(LemmyErrorType::CannotCreatePostOrCommentInDeletedOrRemovedCommunity)?
+  } else {
+    Ok(())
+  }
+}
+
+/// Generate a unique ID for an activity, in the format:
+/// `http(s)://example.com/receive/create/202daf0a-1489-45df-8d2e-c8a3173fed36`
+fn generate_activity_id<T>(kind: T, protocol_and_hostname: &str) -> Result<Url, ParseError>
+where
+  T: ToString,
+{
+  let id = format!(
+    "{}/activities/{}/{}",
+    protocol_and_hostname,
+    kind.to_string().to_lowercase(),
+    Uuid::new_v4()
+  );
+  Url::parse(&id)
+}
+
+#[tracing::instrument(skip_all)]
+async fn send_lemmy_activity<Activity, ActorT>(
+  data: &Data<LemmyContext>,
+  activity: Activity,
+  actor: &ActorT,
+  mut inbox: Vec<Url>,
+  sensitive: bool,
+) -> Result<(), LemmyError>
+where
+  Activity: ActivityHandler + Serialize + Send + Sync + Clone,
+  ActorT: Actor,
+  Activity: ActivityHandler<Error = LemmyError>,
+{
+  static CACHE: Lazy<Cache<(), Arc<Vec<String>>>> = Lazy::new(|| {
+    Cache::builder()
+      .max_capacity(1)
+      .time_to_live(DEAD_INSTANCE_LIST_CACHE_DURATION)
+      .build()
+  });
+  let dead_instances = CACHE
+    .try_get_with((), async {
+      Ok::<_, diesel::result::Error>(Arc::new(Instance::dead_instances(&mut data.pool()).await?))
+    })
+    .await?;
+
+  inbox.retain(|i| {
+    let domain = i.domain().expect("has domain").to_string();
+    !dead_instances.contains(&domain)
+  });
+  info!("Sending activity {}", activity.id().to_string());
+  let activity = WithContext::new(activity, CONTEXT.deref().clone());
+
+  let form = SentActivityForm {
+    ap_id: activity.id().clone().into(),
+    data: serde_json::to_value(activity.clone())?,
+    sensitive,
+  };
+  SentActivity::create(&mut data.pool(), form).await?;
+  send_activity(activity, actor, inbox, data).await?;
+
+  Ok(())
+}
+
+pub async fn handle_outgoing_activities(context: Data<LemmyContext>) -> LemmyResult<()> {
+  while let Some(data) = ActivityChannel::retrieve_activity().await {
+    match_outgoing_activities(data, &context.reset_request_count()).await?
+  }
+  Ok(())
+}
+
+pub async fn match_outgoing_activities(
+  data: SendActivityData,
+  context: &Data<LemmyContext>,
+) -> LemmyResult<()> {
+  let fed_task = match data {
+    SendActivityData::CreatePost(post) => {
+      let creator_id = post.creator_id;
+      CreateOrUpdatePage::send(
+        post,
+        creator_id,
+        CreateOrUpdateType::Create,
+        context.reset_request_count(),
+      )
+    }
+  };
+  if *SYNCHRONOUS_FEDERATION {
+    fed_task.await?;
+  } else {
+    spawn_try_task(fed_task);
+  }
+  Ok(())
+}