Dav Push: Support for calendar collections

src/main.rs

@@ -1,17 +1,22 @@
 use crate::config::Config;
-use actix_web::http::KeepAlive;
+use actix_web::http::{KeepAlive, StatusCode};
 use actix_web::HttpServer;
 use anyhow::Result;
 use app::make_app;
 use clap::{Parser, Subcommand};
 use commands::{cmd_gen_config, cmd_pwhash};
 use config::{DataStoreConfig, SqliteDataStoreConfig};
+use rustical_dav::xml::multistatus::PropstatElement;
 use rustical_store::auth::StaticUserStore;
-use rustical_store::{AddressbookStore, CalendarStore, SubscriptionStore};
+use rustical_store::{AddressbookStore, CalendarStore, CollectionOperation, SubscriptionStore};
+use rustical_store_sqlite::calendar_store::SqliteCalendarStore;
 use rustical_store_sqlite::{create_db_pool, SqliteStore};
+use rustical_xml::{XmlRootTag, XmlSerialize, XmlSerializeRoot};
 use setup_tracing::setup_tracing;
 use std::fs;
 use std::sync::Arc;
+use tokio::sync::mpsc::Receiver;
+use tracing::{error, info};
 
 mod app;
 mod commands;
@@ -43,20 +48,43 @@ async fn get_data_stores(
     Arc<dyn AddressbookStore>,
     Arc<dyn CalendarStore>,
     Arc<dyn SubscriptionStore>,
+    Receiver<CollectionOperation>,
 )> {
     Ok(match &config {
         DataStoreConfig::Sqlite(SqliteDataStoreConfig { db_url }) => {
             let db = create_db_pool(db_url, migrate).await?;
-            let sqlite_store = Arc::new(SqliteStore::new(db));
-            (
-                sqlite_store.clone(),
-                sqlite_store.clone(),
-                sqlite_store.clone(),
-            )
+            // Channel to watch for changes (for DAV Push)
+            let (send, recv) = tokio::sync::mpsc::channel(1000);
+
+            let addressbook_store = Arc::new(SqliteStore::new(db.clone()));
+            let cal_store = Arc::new(SqliteCalendarStore::new(db.clone(), send));
+            let subscription_store = Arc::new(SqliteStore::new(db.clone()));
+            (addressbook_store, cal_store, subscription_store, recv)
         }
     })
 }
 
+// TODO: Move this code somewhere else :)
+
+#[derive(XmlSerialize, Debug)]
+struct PushMessageProp {
+    #[xml(ns = "rustical_dav::namespace::NS_DAV")]
+    topic: String,
+    #[xml(ns = "rustical_dav::namespace::NS_DAV")]
+    sync_token: Option<String>,
+}
+
+#[derive(XmlSerialize, XmlRootTag, Debug)]
+#[xml(root = b"push-message", ns = "rustical_dav::namespace::NS_DAVPUSH")]
+#[xml(ns_prefix(
+    rustical_dav::namespace::NS_DAVPUSH = b"",
+    rustical_dav::namespace::NS_DAV = b"D",
+))]
+struct PushMessage {
+    #[xml(ns = "rustical_dav::namespace::NS_DAV")]
+    propstat: PropstatElement<PushMessageProp>,
+}
+
 #[tokio::main]
 async fn main() -> Result<()> {
     let args = Args::parse();
@@ -69,9 +97,59 @@ async fn main() -> Result<()> {
 
             setup_tracing(&config.tracing);
 
-            let (addr_store, cal_store, subscription_store) =
+            let (addr_store, cal_store, subscription_store, mut update_recv) =
                 get_data_stores(!args.no_migrations, &config.data_store).await?;
 
+            let subscription_store_clone = subscription_store.clone();
+            tokio::spawn(async move {
+                let subscription_store = subscription_store_clone.clone();
+                while let Some(message) = update_recv.recv().await {
+                    dbg!(&message);
+                    if let Ok(subscribers) =
+                        subscription_store.get_subscriptions(&message.topic).await
+                    {
+                        let status = match message.r#type {
+                            rustical_store::CollectionOperationType::Object => StatusCode::OK,
+                            rustical_store::CollectionOperationType::Delete => {
+                                StatusCode::NOT_FOUND
+                            }
+                        };
+                        let push_message = PushMessage {
+                            propstat: PropstatElement {
+                                prop: PushMessageProp {
+                                    topic: message.topic,
+                                    sync_token: message.sync_token,
+                                },
+                                status,
+                            },
+                        };
+                        let mut output: Vec<_> =
+                            b"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n".into();
+                        let mut writer = quick_xml::Writer::new_with_indent(&mut output, b' ', 4);
+                        if let Err(err) = push_message.serialize_root(&mut writer) {
+                            error!("Could not serialize push message: {}", err);
+                            continue;
+                        }
+                        let payload = String::from_utf8(output).unwrap();
+                        for subscriber in subscribers {
+                            info!(
+                                "Sending a push message to {}: {}",
+                                subscriber.push_resource, payload
+                            );
+                            let client = reqwest::Client::new();
+                            if let Err(err) = client
+                                .post(subscriber.push_resource)
+                                .body(payload.to_owned())
+                                .send()
+                                .await
+                            {
+                                error!("{err}");
+                            }
+                        }
+                    }
+                }
+            });
+
             let user_store = Arc::new(match config.auth {
                 config::AuthConfig::Static(config) => StaticUserStore::new(config),
             });