feat: Send webxdc status updates in InBroadcast-s (#7679)

They are already applied by the broadcast owner and other subscriber's devices, no changes are
needed on the receiver side.

src/chat.rs

@@ -2697,7 +2697,9 @@ async fn prepare_send_msg(
             .unwrap_or_default(),
         _ => false,
     };
-    if let Some(reason) = chat.why_cant_send_ex(context, &skip_fn).await? {
+    if msg.param.get_cmd() == SystemMessage::WebxdcStatusUpdate {
+        // Already checked in `send_webxdc_status_update_struct()`.
+    } else if let Some(reason) = chat.why_cant_send_ex(context, &skip_fn).await? {
         bail!("Cannot send to {chat_id}: {reason}");
     }
 

src/webxdc.rs

@@ -34,7 +34,7 @@ use serde_json::Value;
 use sha2::{Digest, Sha256};
 use tokio::{fs::File, io::BufReader};
 
-use crate::chat::{self, Chat};
+use crate::chat::{self, CantSendReason, Chat};
 use crate::constants::Chattype;
 use crate::contact::ContactId;
 use crate::context::Context;
@@ -536,9 +536,14 @@ impl Context {
         let chat = Chat::load_from_db(self, chat_id)
             .await
             .with_context(|| format!("Failed to load chat {chat_id} from the database"))?;
-        if let Some(reason) = chat.why_cant_send(self).await.with_context(|| {
+        let skip_fn = |reason: &CantSendReason| *reason == CantSendReason::InBroadcast;
-            format!("Failed to check if webxdc update can be sent to chat {chat_id}")
+        if let Some(reason) = chat
-        })? {
+            .why_cant_send_ex(self, &skip_fn)
+            .await
+            .with_context(|| {
+                format!("Failed to check if webxdc update can be sent to chat {chat_id}")
+            })?
+        {
             bail!("Cannot send to {chat_id}: {reason}.");
         }
 

src/webxdc/webxdc_tests.rs

@@ -11,7 +11,9 @@ use crate::chat::{
 use crate::chatlist::Chatlist;
 use crate::config::Config;
 use crate::ephemeral;
+use crate::imex::{BackupProvider, get_backup};
 use crate::receive_imf::receive_imf;
+use crate::securejoin::get_securejoin_qr;
 use crate::test_utils::{E2EE_INFO_MSGS, TestContext, TestContextManager};
 use crate::tools::{self, SystemTime};
 use crate::{message, sql};
@@ -1588,6 +1590,55 @@ async fn test_webxdc_no_internet_access() -> Result<()> {
     Ok(())
 }
 
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn test_in_broadcast_send_status_update() -> Result<()> {
+    let mut tcm = TestContextManager::new();
+    let alice = &tcm.alice().await;
+    let bob = &tcm.bob().await;
+
+    let alice_chat_id = create_broadcast(alice, "bc".to_string()).await?;
+    let qr = get_securejoin_qr(alice, Some(alice_chat_id)).await?;
+    let bob_chat_id = tcm.exec_securejoin_qr(bob, alice, &qr).await;
+
+    let alice_instance = send_webxdc_instance(alice, alice_chat_id).await?;
+    let sent_msg = alice.pop_sent_msg().await;
+    let bob_instance = bob.recv_msg(&sent_msg).await;
+    assert_eq!(bob_instance.chat_id, bob_chat_id);
+
+    let provider = BackupProvider::prepare(bob).await?;
+    let bob1 = &tcm.unconfigured().await;
+    get_backup(bob1, provider.qr()).await?;
+
+    bob.send_webxdc_status_update(bob_instance.id, r#"{"payload":42}"#)
+        .await?;
+    bob.flush_status_updates().await?;
+    let sent_msg = bob.pop_sent_msg().await;
+
+    alice.recv_msg_trash(&sent_msg).await;
+    assert_eq!(
+        alice
+            .get_webxdc_status_updates(alice_instance.id, StatusUpdateSerial(0))
+            .await?,
+        r#"[{"payload":42,"serial":1,"max_serial":1}]"#
+    );
+
+    bob1.recv_msg_trash(&sent_msg).await;
+    assert_eq!(
+        bob1.get_webxdc_status_updates(bob_instance.id, StatusUpdateSerial(0))
+            .await?,
+        r#"[{"payload":42,"serial":1,"max_serial":1}]"#
+    );
+
+    // Non-subscriber's status updates are rejected.
+    let alice_bob_id = alice.add_or_lookup_contact_id(bob).await;
+    remove_contact_from_chat(alice, alice_chat_id, alice_bob_id).await?;
+    alice.pop_sent_msg().await;
+    let status =
+        helper_send_receive_status_update(bob, alice, &bob_instance, &alice_instance).await?;
+    assert_eq!(status, r#"[{"payload":42,"serial":1,"max_serial":1}]"#);
+    Ok(())
+}
+
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn test_webxdc_chatlist_summary() -> Result<()> {
     let t = TestContext::new_alice().await;