lemmy/crates/apub/src/protocol/activities/community/remove_mod.rs

use crate::{
  activities::{community::get_community_from_moderators_url, verify_community_matches},
  local_instance,
  objects::{community::ApubCommunity, person::ApubPerson},
  protocol::InCommunity,
};
use activitypub_federation::{core::object_id::ObjectId, deser::helpers::deserialize_one_or_many};
use activitystreams_kinds::activity::RemoveType;
use lemmy_api_common::LemmyContext;
use lemmy_utils::error::LemmyError;
use serde::{Deserialize, Serialize};
use url::Url;

#[derive(Clone, Debug, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct RemoveMod {
  pub(crate) actor: ObjectId<ApubPerson>,
  #[serde(deserialize_with = "deserialize_one_or_many")]
  pub(crate) to: Vec<Url>,
  pub(crate) object: ObjectId<ApubPerson>,
  #[serde(deserialize_with = "deserialize_one_or_many")]
  pub(crate) cc: Vec<Url>,
  #[serde(rename = "type")]
  pub(crate) kind: RemoveType,
  pub(crate) target: Url,
  pub(crate) id: Url,
  pub(crate) audience: Option<ObjectId<ApubCommunity>>,
}

#[async_trait::async_trait(?Send)]
impl InCommunity for RemoveMod {
  async fn community(
    &self,
    context: &LemmyContext,
    request_counter: &mut i32,
  ) -> Result<ApubCommunity, LemmyError> {
    let mod_community =
      get_community_from_moderators_url(&self.target, context, request_counter).await?;
    if let Some(audience) = &self.audience {
      let audience = audience
        .dereference(context, local_instance(context).await, request_counter)
        .await?;
      verify_community_matches(&audience, mod_community.id)?;
      Ok(audience)
    } else {
      Ok(mod_community)
    }
  }
}