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

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use crate::{
check_is_apub_id_valid,
context::WithContext,
generate_moderators_url,
insert_activity,
objects::{community::ApubCommunity, person::ApubPerson},
};
use activitystreams_kinds::public;
use lemmy_api_common::blocking;
use lemmy_apub_lib::{
activity_queue::send_activity,
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object_id::ObjectId,
traits::ActorType,
verify::verify_domains_match,
};
use lemmy_db_schema::source::community::Community;
use lemmy_db_views_actor::{
community_person_ban_view::CommunityPersonBanView,
community_view::CommunityView,
};
use lemmy_utils::{settings::structs::Settings, LemmyError};
use lemmy_websocket::LemmyContext;
use serde::Serialize;
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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
.dereference(context, context.client(), request_counter)
.await?;
if person.banned {
let error = LemmyError::from(anyhow::anyhow!("Person {} is banned", person_id));
return Err(error.with_message("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
.dereference(context, context.client(), 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;
let is_banned =
move |conn: &'_ _| CommunityPersonBanView::get(conn, person_id, community_id).is_ok();
if blocking(context.pool(), is_banned).await? {
return Err(LemmyError::from_message("Person is banned from community"));
}
Ok(())
}
fn verify_activity(id: &Url, actor: &Url, settings: &Settings) -> Result<(), LemmyError> {
check_is_apub_id_valid(actor, false, settings)?;
verify_domains_match(id, actor)?;
Ok(())
}
/// Verify that the actor is a community mod. This check is only run if the community is local,
/// because in case of remote communities, admins can also perform mod actions. As admin status
/// is not federated, we cant verify their actions remotely.
#[tracing::instrument(skip_all)]
pub(crate) async fn verify_mod_action(
actor_id: &ObjectId<ApubPerson>,
community: &ApubCommunity,
context: &LemmyContext,
request_counter: &mut i32,
) -> Result<(), LemmyError> {
if community.local {
let actor = actor_id
.dereference(context, context.client(), request_counter)
.await?;
// Note: this will also return true for admins in addition to mods, but as we dont know about
// remote admins, it doesnt make any difference.
let community_id = community.id;
let actor_id = actor.id;
let is_mod_or_admin = blocking(context.pool(), move |conn| {
CommunityView::is_mod_or_admin(conn, actor_id, community_id)
})
.await?;
if !is_mod_or_admin {
return Err(LemmyError::from_message("Not a mod"));
}
}
Ok(())
}
/// 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 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<T: Serialize>(
context: &LemmyContext,
activity: &T,
activity_id: &Url,
actor: &dyn ActorType,
inboxes: Vec<Url>,
sensitive: bool,
) -> Result<(), LemmyError> {
if !context.settings().federation.enabled || inboxes.is_empty() {
return Ok(());
}
let activity = WithContext::new(activity);
info!("Sending activity {}", activity_id.to_string());
// Don't send anything to ourselves
// TODO: this should be a debug assert
let hostname = context.settings().get_hostname_without_port()?;
let inboxes: Vec<&Url> = inboxes
.iter()
.filter(|i| i.domain().expect("valid inbox url") != hostname)
.collect();
let serialised_activity = serde_json::to_string(&activity)?;
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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(
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activity_id,
actor,
inboxes,
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serialised_activity,
context.client(),
context.activity_queue(),
)
.await
}