lemmy/crates/apub/src/activities/mod.rs

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4.7 KiB
Rust
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use crate::{
insert_activity,
objects::{community::ApubCommunity, person::ApubPerson},
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;
use lemmy_db_schema::{newtypes::CommunityId, source::community::Community};
use lemmy_db_views_actor::structs::{CommunityPersonBanView, CommunityView};
use lemmy_utils::error::{LemmyError, LemmyErrorExt, LemmyErrorType};
use serde::Serialize;
use std::ops::Deref;
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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;
/// 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;
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let is_banned = CommunityPersonBanView::get(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?;
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let is_mod_or_admin =
CommunityView::is_mod_or_admin(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> {
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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,
inbox: Vec<Url>,
sensitive: bool,
) -> Result<(), LemmyError>
where
Activity: ActivityHandler + Serialize + Send + Sync + Clone,
ActorT: Actor,
Activity: ActivityHandler<Error = LemmyError>,
{
info!("Sending activity {}", activity.id().to_string());
let activity = WithContext::new(activity, CONTEXT.deref().clone());
insert_activity(activity.id(), &activity, true, sensitive, data).await?;
send_activity(activity, actor, inbox, data).await?;
Ok(())
}