use crate::{ check_is_apub_id_valid, community::do_announce, extensions::signatures::sign, insert_activity, ActorType, }; use activitystreams::{ base::{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::{community::Community, user::User_, DbPool}; use lemmy_utils::{location_info, settings::Settings, LemmyError}; use lemmy_websocket::LemmyContext; use log::warn; use reqwest::Client; use serde::{Deserialize, Serialize}; use std::{collections::BTreeMap, future::Future, pin::Pin}; use url::Url; pub async fn send_activity_single_dest( activity: T, creator: &dyn ActorType, to: Url, context: &LemmyContext, ) -> Result<(), LemmyError> where T: AsObject + Extends, Kind: Serialize, >::Error: From + Send + Sync + 'static, { if check_is_apub_id_valid(&to).is_ok() { send_activity_internal( context.activity_queue(), activity, creator, vec![to], context.pool(), ) .await?; } Ok(()) } pub async fn send_to_community_followers( activity: T, community: &Community, context: &LemmyContext, sender_shared_inbox: Option, ) -> Result<(), LemmyError> where T: AsObject + Extends, Kind: Serialize, >::Error: From + Send + Sync + 'static, { // dont send to the local instance, nor to the instance where the activity originally came from, // because that would result in a database error (same data inserted twice) let community_shared_inbox = community.get_shared_inbox_url()?; let to: Vec = community .get_follower_inboxes(context.pool()) .await? .iter() .filter(|inbox| Some(inbox) != sender_shared_inbox.as_ref().as_ref()) .filter(|inbox| inbox != &&community_shared_inbox) .filter(|inbox| check_is_apub_id_valid(inbox).is_ok()) .unique() .map(|inbox| inbox.to_owned()) .collect(); send_activity_internal( context.activity_queue(), activity, community, to, context.pool(), ) .await?; Ok(()) } pub async fn send_to_community( creator: &User_, community: &Community, activity: T, context: &LemmyContext, ) -> Result<(), LemmyError> where T: AsObject + Extends, 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 { do_announce(activity.into_any_base()?, &community, creator, context).await?; } else { let inbox = community.get_shared_inbox_url()?; check_is_apub_id_valid(&inbox)?; send_activity_internal( context.activity_queue(), activity, creator, vec![inbox], context.pool(), ) .await?; } Ok(()) } pub async fn send_comment_mentions( creator: &User_, mentions: Vec, activity: T, context: &LemmyContext, ) -> Result<(), LemmyError> where T: AsObject + Extends, Kind: Serialize, >::Error: From + Send + Sync + 'static, { 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(), ) .await?; Ok(()) } /// Asynchronously sends the given `activity` from `actor` to every inbox URL in `to`. /// /// 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, to: Vec, pool: &DbPool, ) -> Result<(), LemmyError> where T: AsObject + Extends, Kind: Serialize, >::Error: From + Send + Sync + 'static, { if !Settings::get().federation.enabled { return Ok(()); } for to_url in &to { assert!(check_is_apub_id_valid(&to_url).is_ok()); } let activity = activity.into_any_base()?; let serialised_activity = serde_json::to_string(&activity)?; insert_activity(actor.user_id(), serialised_activity.clone(), true, pool).await?; // TODO: it would make sense to create a separate task for each destination server let message = SendActivityTask { activity: serialised_activity, to, 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, to: Vec, actor_id: Url, private_key: String, } 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 { for to_url in &self.to { let mut headers = BTreeMap::::new(); headers.insert("Content-Type".into(), "application/json".into()); let result = sign( &state.client, headers, to_url, 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, to_url )); } } 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, }