use std::collections::BTreeMap; use base64::Engine; use http_signature_normalization::Config; use openssl::{hash::MessageDigest, pkey::{PKey, Private}, sign::Signer}; use reqwest::header::{CONTENT_TYPE, USER_AGENT}; use sea_orm::{ColumnTrait, Condition, DatabaseConnection, EntityTrait, Order, QueryFilter, QueryOrder}; use tokio::task::JoinHandle; use crate::{activitypub::{activity::ap_activity, object::ap_object, user::outbox::UpubError}, activitystream::{object::activity::ActivityMut, Node}, model, server::Context, 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 payload = 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; }; if let Err(e) = deliver(&key, &delivery.target, &delivery.actor, payload, &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(key: &PKey, to: &str, from: &str, payload: serde_json::Value, domain: &str) -> Result<(), UpubError> { let payload = serde_json::to_string(&payload).unwrap(); let digest = format!("sha-256={}", sha256::digest(&payload)); let host = Context::server(to); let date = chrono::Utc::now().format("%d %b %Y %H:%M:%S %Z").to_string(); // TODO literally what the fuck let headers : BTreeMap = [ ("Host".to_string(), host.clone()), ("Date".to_string(), date.clone()), ("Digest".to_string(), digest.clone()), ].into(); let path = to.replace("https://", "").replace("http://", "").replace(&host, ""); let signature_header = Config::new() .begin_sign("POST", &path, headers) .unwrap() .sign(format!("{from}#main-key"), |to_sign| { tracing::info!("signing '{to_sign}'"); let mut signer = Signer::new(MessageDigest::sha256(), key)?; signer.update(to_sign.as_bytes())?; let signature = base64::prelude::BASE64_URL_SAFE.encode(signer.sign_to_vec()?); Ok(signature) as Result<_, UpubError> }) .unwrap() .signature_header(); tracing::info!("signature header: {signature_header}"); let res = reqwest::Client::new() .post(to) .header("Host", host) .header("Date", date) .header("Digest", digest) .header("Signature", signature_header) .header(CONTENT_TYPE, "application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\"") .header(USER_AGENT, format!("upub+{VERSION} ({domain})")) // TODO put instance admin email .body(payload) .send() .await? .error_for_status()? .text() .await?; tracing::info!("server answered with OK '{res}'"); Ok(()) }