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

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use crate::{
generate_moderators_url,
insert_activity,
local_instance,
objects::{community::ApubCommunity, person::ApubPerson},
ActorType,
CONTEXT,
};
use activitypub_federation::{
core::{activity_queue::send_activity, object_id::ObjectId},
deser::context::WithContext,
traits::{ActivityHandler, Actor},
};
use activitystreams_kinds::public;
use anyhow::anyhow;
use lemmy_db_schema::{
newtypes::CommunityId,
source::{community::Community, local_site::LocalSite},
};
use lemmy_db_views_actor::structs::{CommunityPersonBanView, CommunityView};
use lemmy_utils::error::LemmyError;
use lemmy_websocket::LemmyContext;
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 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: &LemmyContext,
request_counter: &mut i32,
) -> Result<(), LemmyError> {
let person = person_id
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.dereference(context, local_instance(context).await, request_counter)
.await?;
if person.banned {
let err = anyhow!("Person {} is banned", person_id);
return Err(LemmyError::from_error_message(err, "banned"));
}
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: &LemmyContext,
request_counter: &mut i32,
) -> Result<(), LemmyError> {
let person = person_id
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.dereference(context, local_instance(context).await, request_counter)
.await?;
if person.banned {
return Err(LemmyError::from_message("Person is banned from site"));
}
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(LemmyError::from_message("Person is banned from community"));
}
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: &LemmyContext,
request_counter: &mut i32,
) -> Result<(), LemmyError> {
let mod_ = mod_id
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.dereference(context, local_instance(context).await, request_counter)
.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(LemmyError::from_message("Not a mod"))
}
/// For Add/Remove community moderator activities, check that the target field actually contains
/// /c/community/moderators. Any different values are unsupported.
fn verify_add_remove_moderator_target(
target: &Url,
community: &ApubCommunity,
) -> Result<(), LemmyError> {
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if target != &generate_moderators_url(&community.actor_id)?.into() {
return Err(LemmyError::from_message("Unkown target url"));
}
Ok(())
}
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(LemmyError::from_message("Object is not public"));
}
Ok(())
}
pub(crate) fn verify_community_matches(
a: &ApubCommunity,
b: CommunityId,
) -> Result<(), LemmyError> {
if a.id != b {
return Err(LemmyError::from_message("Invalid community"));
}
Ok(())
}
pub(crate) fn check_community_deleted_or_removed(community: &Community) -> Result<(), LemmyError> {
if community.deleted || community.removed {
Err(LemmyError::from_message(
"New post or comment cannot be created in deleted or removed community",
))
} 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>(
context: &LemmyContext,
activity: Activity,
actor: &ActorT,
inbox: Vec<Url>,
sensitive: bool,
) -> Result<(), LemmyError>
where
Activity: ActivityHandler + Serialize,
ActorT: Actor + ActorType,
Activity: ActivityHandler<Error = LemmyError>,
{
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let federation_enabled = LocalSite::read(context.pool())
.await
.map(|l| l.federation_enabled)
.unwrap_or(false);
if !federation_enabled {
return Ok(());
}
info!("Sending activity {}", activity.id().to_string());
let activity = WithContext::new(activity, CONTEXT.deref().clone());
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let object_value = serde_json::to_value(&activity)?;
insert_activity(activity.id(), object_value, true, sensitive, context.pool()).await?;
send_activity(
activity,
actor.get_public_key(),
actor.private_key().expect("actor has private key"),
inbox,
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local_instance(context).await,
)
.await?;
Ok(())
}