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}; use reqwest::Client; use serde::{export::fmt::Debug, Deserialize, Serialize}; use std::{collections::BTreeMap, future::Future, pin::Pin}; use url::Url; /// 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( activity: T, creator: &dyn ActorType, inbox: Url, context: &LemmyContext, ) -> Result<(), LemmyError> where T: AsObject + Extends + Debug + BaseExt, Kind: Serialize, >::Error: From + 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(()) } /// 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( activity: T, community: &Community, context: &LemmyContext, ) -> Result<(), LemmyError> where T: AsObject + Extends + Debug + BaseExt, Kind: Serialize, >::Error: From + Send + Sync + 'static, { let follower_inboxes: Vec = 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(()) } /// 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( activity: T, creator: &User_, community: &Community, context: &LemmyContext, ) -> Result<(), LemmyError> where T: AsObject + Extends + Debug + BaseExt, Kind: Serialize, >::Error: From + 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(()) } /// 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( creator: &User_, mentions: Vec, activity: T, context: &LemmyContext, ) -> Result<(), LemmyError> where T: AsObject + Extends + Debug + BaseExt, Kind: Serialize, >::Error: From + 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(()) } /// 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( activity_sender: &QueueHandle, activity: T, actor: &dyn ActorType, inboxes: Vec, pool: &DbPool, insert_into_db: bool, sensitive: bool, ) -> Result<(), LemmyError> where T: AsObject + Extends + Debug, Kind: Serialize, >::Error: From + 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::(message)?; } Ok(()) } #[derive(Clone, Debug, Deserialize, Serialize)] struct SendActivityTask { activity: String, inbox: Url, actor_id: Url, private_key: String, } /// 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>>>; 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::::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; 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::() .start(queue_handle.clone()); queue_handle } #[derive(Clone)] struct MyState { pub client: Client, }