lemmy/crates/apub/src/activities/following/follow.rs

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use crate::{
activities::{
generate_activity_id,
send_lemmy_activity,
verify_person,
verify_person_in_community,
},
local_instance,
objects::{community::ApubCommunity, person::ApubPerson},
protocol::activities::following::{accept::AcceptFollowCommunity, follow::FollowCommunity},
ActorType,
};
use activitypub_federation::{core::object_id::ObjectId, data::Data, traits::ActivityHandler};
use activitystreams_kinds::activity::FollowType;
use lemmy_api_common::utils::blocking;
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use lemmy_db_schema::{
source::community::{CommunityFollower, CommunityFollowerForm},
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traits::Followable,
};
use lemmy_utils::error::LemmyError;
use lemmy_websocket::LemmyContext;
use url::Url;
impl FollowCommunity {
pub(in crate::activities::following) fn new(
actor: &ApubPerson,
community: &ApubCommunity,
context: &LemmyContext,
) -> Result<FollowCommunity, LemmyError> {
Ok(FollowCommunity {
actor: ObjectId::new(actor.actor_id()),
object: ObjectId::new(community.actor_id()),
kind: FollowType::Follow,
id: generate_activity_id(
FollowType::Follow,
&context.settings().get_protocol_and_hostname(),
)?,
unparsed: Default::default(),
})
}
#[tracing::instrument(skip_all)]
pub async fn send(
actor: &ApubPerson,
community: &ApubCommunity,
context: &LemmyContext,
) -> Result<(), LemmyError> {
let community_follower_form = CommunityFollowerForm {
community_id: community.id,
person_id: actor.id,
pending: true,
};
blocking(context.pool(), move |conn| {
CommunityFollower::follow(conn, &community_follower_form).ok()
})
.await?;
let follow = FollowCommunity::new(actor, community, context)?;
let inbox = vec![community.inbox_url.clone().into()];
send_lemmy_activity(context, &follow, &follow.id, actor, inbox, true).await
}
}
#[async_trait::async_trait(?Send)]
impl ActivityHandler for FollowCommunity {
type DataType = LemmyContext;
type Error = LemmyError;
fn id(&self) -> &Url {
&self.id
}
fn actor(&self) -> &Url {
self.actor.inner()
}
#[tracing::instrument(skip_all)]
async fn verify(
&self,
context: &Data<LemmyContext>,
request_counter: &mut i32,
) -> Result<(), LemmyError> {
verify_person(&self.actor, context, request_counter).await?;
let community = self
.object
.dereference::<LemmyError>(context, local_instance(context), request_counter)
.await?;
verify_person_in_community(&self.actor, &community, context, request_counter).await?;
Ok(())
}
#[tracing::instrument(skip_all)]
async fn receive(
self,
context: &Data<LemmyContext>,
request_counter: &mut i32,
) -> Result<(), LemmyError> {
let person = self
.actor
.dereference::<LemmyError>(context, local_instance(context), request_counter)
.await?;
let community = self
.object
.dereference::<LemmyError>(context, local_instance(context), request_counter)
.await?;
let community_follower_form = CommunityFollowerForm {
community_id: community.id,
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person_id: person.id,
pending: false,
};
// This will fail if they're already a follower, but ignore the error.
blocking(context.pool(), move |conn| {
CommunityFollower::follow(conn, &community_follower_form).ok()
})
.await?;
AcceptFollowCommunity::send(self, context, request_counter).await
}
}