use base64::Engine; use openssl::{hash::MessageDigest, pkey::PKey, sign::Signer}; use reqwest::header::{CONTENT_TYPE, USER_AGENT}; use sea_orm::{ColumnTrait, Condition, DatabaseConnection, EntityTrait, Order, QueryFilter, QueryOrder, QuerySelect, SelectColumns}; use tokio::task::JoinHandle; use crate::{activitypub::{activity::ap_activity, jsonld::LD, object::ap_object, user::outbox::UpubError}, activitystream::{object::activity::ActivityMut, Node}, model, VERSION}; pub struct Dispatcher; impl Dispatcher { pub fn spawn(db: DatabaseConnection, domain: String, poll_interval: u64) -> JoinHandle<()> { tokio::spawn(async move { if let Err(e) = worker(db, domain, poll_interval).await { tracing::error!("delivery worker exited with error: {e}"); } }) } } async fn worker(db: DatabaseConnection, domain: String, poll_interval: u64) -> Result<(), UpubError> { let mut nosleep = true; loop { if nosleep { nosleep = false } else { tokio::time::sleep(std::time::Duration::from_secs(poll_interval)).await; } let Some(delivery) = model::delivery::Entity::find() .filter(Condition::all().add(model::delivery::Column::NotBefore.lte(chrono::Utc::now()))) .order_by(model::delivery::Column::NotBefore, Order::Asc) .one(&db) .await? else { continue }; let del_row = model::delivery::ActiveModel { id: sea_orm::ActiveValue::Set(delivery.id), ..Default::default() }; let del = model::delivery::Entity::delete(del_row) .exec(&db) .await?; if del.rows_affected == 0 { // another worker claimed this delivery nosleep = true; continue; // go back to the top } if delivery.expired() { // try polling for another one nosleep = true; continue; // go back to top } tracing::info!("delivering {} to {}", delivery.activity, delivery.target); let json_data = match model::activity::Entity::find_by_id(&delivery.activity) .find_also_related(model::object::Entity) .one(&db) .await? // TODO probably should not fail here and at least re-insert the delivery { Some((activity, Some(object))) => ap_activity(activity).set_object(Node::object(ap_object(object))), Some((activity, None)) => ap_activity(activity), None => { tracing::warn!("skipping dispatch for deleted object {}", delivery.activity); continue; }, }; let Some(model::user::Model{ private_key: Some(key), .. }) = model::user::Entity::find_by_id(&delivery.actor) .one(&db).await? else { tracing::error!("can not dispatch activity for user without private key: {}", delivery.actor); continue; }; let Ok(key) = PKey::private_key_from_pem(key.as_bytes()) else { tracing::error!("failed parsing private key for user {}", delivery.actor); continue; }; let mut signer = Signer::new(MessageDigest::sha256(), &key)?; let without_protocol = delivery.target.replace("https://", "").replace("http://", ""); let host = without_protocol.split('/').next().unwrap_or("").to_string(); let request_target = without_protocol.replace(&host, ""); let date = chrono::Utc::now().to_rfc2822(); let payload = serde_json::to_string(&json_data.ld_context()).unwrap(); let digest = format!("sha-256={}", sha256::digest(&payload)); let signed_string = format!("(request-target): post {request_target}\nhost: {host}\ndate: {date}\ndigest: {digest}"); tracing::info!("signing: \n{signed_string}"); signer.update(signed_string.as_bytes())?; let signature = base64::prelude::BASE64_URL_SAFE.encode(signer.sign_to_vec()?); let signature_header = format!("keyId=\"{}#main-key\",headers=\"(request-target) host date digest\",signature=\"{signature}\"", delivery.actor); tracing::info!("attaching header: {signature_header}"); if let Err(e) = deliver(&delivery.target, payload, host, date, digest, signature_header, &domain).await { tracing::warn!("failed delivery of {} to {} : {e}", delivery.activity, delivery.target); let new_delivery = model::delivery::ActiveModel { id: sea_orm::ActiveValue::NotSet, not_before: sea_orm::ActiveValue::Set(delivery.next_delivery()), actor: sea_orm::ActiveValue::Set(delivery.actor), target: sea_orm::ActiveValue::Set(delivery.target), activity: sea_orm::ActiveValue::Set(delivery.activity), created: sea_orm::ActiveValue::Set(delivery.created), attempt: sea_orm::ActiveValue::Set(delivery.attempt + 1), }; model::delivery::Entity::insert(new_delivery).exec(&db).await?; } } } async fn deliver(target: &str, payload: String, host: String, date: String, digest: String, signature_header: String, domain: &str) -> Result<(), reqwest::Error> { let res = reqwest::Client::new() .post(target) .body(payload) .header("Host", host) .header("Date", date) .header("Digest", digest) .header("Signature", signature_header) .header(CONTENT_TYPE, "application/ld+json") .header(USER_AGENT, format!("upub+{VERSION} ({domain})")) // TODO put instance admin email .send() .await? .error_for_status()? .text() .await?; tracing::info!("server answered with OK '{res}'"); Ok(()) }