lemmy/lemmy_apub/src/activity_queue.rs

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use crate::{
check_is_apub_id_valid,
extensions::signatures::sign_and_send,
insert_activity,
ActorType,
};
use activitystreams::{
base::{BaseExt, Extends, ExtendsExt},
object::AsObject,
};
use anyhow::{anyhow, Context, Error};
use background_jobs::{
create_server,
memory_storage::Storage,
ActixJob,
Backoff,
MaxRetries,
QueueHandle,
WorkerConfig,
};
use itertools::Itertools;
use lemmy_db::{
source::{community::Community, user::User_},
DbPool,
};
use lemmy_utils::{location_info, settings::Settings, LemmyError};
use lemmy_websocket::LemmyContext;
use log::{debug, warn};
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use reqwest::Client;
use serde::{export::fmt::Debug, Deserialize, Serialize};
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use std::{collections::BTreeMap, future::Future, pin::Pin};
use url::Url;
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/// Sends a local activity to a single, remote actor.
///
/// * `activity` the apub activity to be sent
/// * `creator` the local actor which created the activity
/// * `inbox` the inbox url where the activity should be delivered to
pub(crate) async fn send_activity_single_dest<T, Kind>(
activity: T,
creator: &dyn ActorType,
inbox: Url,
context: &LemmyContext,
) -> Result<(), LemmyError>
where
T: AsObject<Kind> + Extends<Kind> + Debug + BaseExt<Kind>,
Kind: Serialize,
<T as Extends<Kind>>::Error: From<serde_json::Error> + Send + Sync + 'static,
{
if check_is_apub_id_valid(&inbox).is_ok() {
debug!(
"Sending activity {:?} to {}",
&activity.id_unchecked(),
&inbox
);
send_activity_internal(
context.activity_queue(),
activity,
creator,
vec![inbox],
context.pool(),
true,
true,
)
.await?;
}
Ok(())
}
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/// From a local community, send activity to all remote followers.
///
/// * `activity` the apub activity to send
/// * `community` the sending community
/// * `sender_shared_inbox` in case of an announce, this should be the shared inbox of the inner
/// activities creator, as receiving a known activity will cause an error
pub(crate) async fn send_to_community_followers<T, Kind>(
activity: T,
community: &Community,
context: &LemmyContext,
) -> Result<(), LemmyError>
where
T: AsObject<Kind> + Extends<Kind> + Debug + BaseExt<Kind>,
Kind: Serialize,
<T as Extends<Kind>>::Error: From<serde_json::Error> + Send + Sync + 'static,
{
let follower_inboxes: Vec<Url> = community
.get_follower_inboxes(context.pool())
.await?
.iter()
.unique()
.filter(|inbox| inbox.host_str() != Some(&Settings::get().hostname))
.filter(|inbox| check_is_apub_id_valid(inbox).is_ok())
.map(|inbox| inbox.to_owned())
.collect();
debug!(
"Sending activity {:?} to followers of {}",
&activity.id_unchecked(),
&community.actor_id
);
send_activity_internal(
context.activity_queue(),
activity,
community,
follower_inboxes,
context.pool(),
true,
false,
)
.await?;
Ok(())
}
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/// Sends an activity from a local user to a remote community.
///
/// * `activity` the activity to send
/// * `creator` the creator of the activity
/// * `community` the destination community
///
pub(crate) async fn send_to_community<T, Kind>(
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activity: T,
creator: &User_,
community: &Community,
context: &LemmyContext,
) -> Result<(), LemmyError>
where
T: AsObject<Kind> + Extends<Kind> + Debug + BaseExt<Kind>,
Kind: Serialize,
<T as Extends<Kind>>::Error: From<serde_json::Error> + Send + Sync + 'static,
{
// if this is a local community, we need to do an announce from the community instead
if community.local {
community
.send_announce(activity.into_any_base()?, context)
.await?;
} else {
let inbox = community.get_shared_inbox_url()?;
check_is_apub_id_valid(&inbox)?;
debug!(
"Sending activity {:?} to community {}",
&activity.id_unchecked(),
&community.actor_id
);
send_activity_internal(
context.activity_queue(),
activity,
creator,
vec![inbox],
context.pool(),
true,
false,
)
.await?;
}
Ok(())
}
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/// Sends notification to any users mentioned in a comment
///
/// * `creator` user who created the comment
/// * `mentions` list of inboxes of users which are mentioned in the comment
/// * `activity` either a `Create/Note` or `Update/Note`
pub(crate) async fn send_comment_mentions<T, Kind>(
creator: &User_,
mentions: Vec<Url>,
activity: T,
context: &LemmyContext,
) -> Result<(), LemmyError>
where
T: AsObject<Kind> + Extends<Kind> + Debug + BaseExt<Kind>,
Kind: Serialize,
<T as Extends<Kind>>::Error: From<serde_json::Error> + Send + Sync + 'static,
{
debug!(
"Sending mentions activity {:?} to {:?}",
&activity.id_unchecked(),
&mentions
);
let mentions = mentions
.iter()
.filter(|inbox| check_is_apub_id_valid(inbox).is_ok())
.map(|i| i.to_owned())
.collect();
send_activity_internal(
context.activity_queue(),
activity,
creator,
mentions,
context.pool(),
false, // Don't create a new DB row
false,
)
.await?;
Ok(())
}
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/// Create new `SendActivityTasks`, which will deliver the given activity to inboxes, as well as
/// handling signing and retrying failed deliveres.
///
/// The caller of this function needs to remove any blocked domains from `to`,
/// using `check_is_apub_id_valid()`.
async fn send_activity_internal<T, Kind>(
activity_sender: &QueueHandle,
activity: T,
actor: &dyn ActorType,
inboxes: Vec<Url>,
pool: &DbPool,
insert_into_db: bool,
sensitive: bool,
) -> Result<(), LemmyError>
where
T: AsObject<Kind> + Extends<Kind> + Debug,
Kind: Serialize,
<T as Extends<Kind>>::Error: From<serde_json::Error> + Send + Sync + 'static,
{
if !Settings::get().federation.enabled || inboxes.is_empty() {
return Ok(());
}
let activity = activity.into_any_base()?;
let serialised_activity = serde_json::to_string(&activity)?;
// This is necessary because send_comment and send_comment_mentions
// might send the same ap_id
if insert_into_db {
let id = activity.id().context(location_info!())?;
insert_activity(id, activity.clone(), true, sensitive, pool).await?;
}
for i in inboxes {
let message = SendActivityTask {
activity: serialised_activity.to_owned(),
inbox: i,
actor_id: actor.actor_id()?,
private_key: actor.private_key().context(location_info!())?,
};
activity_sender.queue::<SendActivityTask>(message)?;
}
Ok(())
}
#[derive(Clone, Debug, Deserialize, Serialize)]
struct SendActivityTask {
activity: String,
inbox: Url,
actor_id: Url,
private_key: String,
}
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/// Signs the activity with the sending actor's key, and delivers to the given inbox. Also retries
/// if the delivery failed.
impl ActixJob for SendActivityTask {
type State = MyState;
type Future = Pin<Box<dyn Future<Output = Result<(), Error>>>>;
const NAME: &'static str = "SendActivityTask";
const MAX_RETRIES: MaxRetries = MaxRetries::Count(10);
const BACKOFF: Backoff = Backoff::Exponential(2);
fn run(self, state: Self::State) -> Self::Future {
Box::pin(async move {
let mut headers = BTreeMap::<String, String>::new();
headers.insert("Content-Type".into(), "application/json".into());
let result = sign_and_send(
&state.client,
headers,
&self.inbox,
self.activity.clone(),
&self.actor_id,
self.private_key.to_owned(),
)
.await;
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if let Err(e) = result {
warn!("{}", e);
return Err(anyhow!(
"Failed to send activity {} to {}",
&self.activity,
self.inbox
));
}
Ok(())
})
}
}
pub fn create_activity_queue() -> QueueHandle {
// Start the application server. This guards access to to the jobs store
let queue_handle = create_server(Storage::new());
// Configure and start our workers
WorkerConfig::new(|| MyState {
client: Client::default(),
})
.register::<SendActivityTask>()
.start(queue_handle.clone());
queue_handle
}
#[derive(Clone)]
struct MyState {
pub client: Client,
}