Send Done message when confirming in MacReceived state

Being in MacReceived state means that the other party has confirmed that
emojis/numbers match and the sent mac messages has been successfully
checked. When now confirming ourselves this means that the verification
was successful and thus the Done message can be sent to the other party.

crates/matrix-sdk-crypto/src/machine.rs

@@ -2147,25 +2147,17 @@ pub(crate) mod test {
         assert_eq!(alice_sas.emoji(), bob_sas.emoji());
         assert_eq!(alice_sas.decimals(), bob_sas.decimals());
 
-        let event = bob_sas
-            .confirm()
-            .await
-            .unwrap()
-            .0
-            .map(|r| request_to_event(bob.user_id(), &r))
-            .unwrap();
+        let contents = bob_sas.confirm().await.unwrap().0;
+        assert!(contents.len() == 1);
+        let event = request_to_event(bob.user_id(), &contents[0]);
         alice.handle_verification_event(&event).await;
 
         assert!(!alice_sas.is_done());
         assert!(!bob_sas.is_done());
 
-        let event = alice_sas
-            .confirm()
-            .await
-            .unwrap()
-            .0
-            .map(|r| request_to_event(alice.user_id(), &r))
-            .unwrap();
+        let contents = alice_sas.confirm().await.unwrap().0;
+        assert!(contents.len() == 1);
+        let event = request_to_event(alice.user_id(), &contents[0]);
 
         assert!(alice_sas.is_done());
         assert!(bob_device.verified());

crates/matrix-sdk-crypto/src/verification/machine.rs

@@ -642,12 +642,16 @@ mod test {
         assert!(bob.emoji().is_some());
         assert_eq!(alice.emoji(), bob.emoji());
 
-        let request = alice.confirm().await.unwrap().0.unwrap();
+        let mut requests = alice.confirm().await.unwrap().0;
+        assert!(requests.len() == 1);
+        let request = requests.pop().unwrap();
         let content = OutgoingContent::try_from(request).unwrap();
         let content = MacContent::try_from(&content).unwrap().into();
         bob.receive_any_event(alice.user_id(), &content);
 
-        let request = bob.confirm().await.unwrap().0.unwrap();
+        let mut requests = bob.confirm().await.unwrap().0;
+        assert!(requests.len() == 1);
+        let request = requests.pop().unwrap();
         let content = OutgoingContent::try_from(request).unwrap();
         let content = MacContent::try_from(&content).unwrap().into();
         alice.receive_any_event(bob.user_id(), &content);

crates/matrix-sdk-crypto/src/verification/sas/inner_sas.rs

@@ -228,27 +228,27 @@ impl InnerSas {
         (InnerSas::Cancelled(sas), Some(content))
     }
 
-    pub fn confirm(self) -> (InnerSas, Option<OutgoingContent>) {
+    pub fn confirm(self) -> (InnerSas, Vec<OutgoingContent>) {
         match self {
             InnerSas::KeyReceived(s) => {
                 let sas = s.confirm();
                 let content = sas.as_content();
-                (InnerSas::Confirmed(sas), Some(content))
+                (InnerSas::Confirmed(sas), vec![content])
             }
             InnerSas::MacReceived(s) => {
                 if s.started_from_request {
                     let sas = s.confirm_and_wait_for_done();
-                    let content = sas.as_content();
+                    let contents = vec![sas.as_content(), sas.done_content()];
 
-                    (InnerSas::WaitingForDone(sas), Some(content))
+                    (InnerSas::WaitingForDone(sas), contents)
                 } else {
                     let sas = s.confirm();
                     let content = sas.as_content();
 
-                    (InnerSas::Done(sas), Some(content))
+                    (InnerSas::Done(sas), vec![content])
                 }
             }
-            _ => (self, None),
+            _ => (self, Vec::new()),
         }
     }
 

crates/matrix-sdk-crypto/src/verification/sas/mod.rs

@@ -355,27 +355,28 @@ impl Sas {
     /// the server.
     pub async fn confirm(
         &self,
-    ) -> Result<
-        (Option<OutgoingVerificationRequest>, Option<SignatureUploadRequest>),
-        CryptoStoreError,
-    > {
-        let (content, done) = {
+    ) -> Result<(Vec<OutgoingVerificationRequest>, Option<SignatureUploadRequest>), CryptoStoreError>
+    {
+        let (contents, done) = {
             let mut guard = self.inner.lock().unwrap();
             let sas: InnerSas = (*guard).clone();
-            let (sas, content) = sas.confirm();
+            let (sas, contents) = sas.confirm();
 
             *guard = sas;
-            (content, guard.is_done())
+            (contents, guard.is_done())
         };
 
-        let mac_request = content.map(|c| match c {
-            OutgoingContent::ToDevice(c) => self.content_to_request(c).into(),
-            OutgoingContent::Room(r, c) => {
-                RoomMessageRequest { room_id: r, txn_id: Uuid::new_v4(), content: c }.into()
-            }
-        });
+        let mac_requests = contents
+            .into_iter()
+            .map(|c| match c {
+                OutgoingContent::ToDevice(c) => self.content_to_request(c).into(),
+                OutgoingContent::Room(r, c) => {
+                    RoomMessageRequest { room_id: r, txn_id: Uuid::new_v4(), content: c }.into()
+                }
+            })
+            .collect::<Vec<_>>();
 
-        if mac_request.is_some() {
+        if !mac_requests.is_empty() {
             trace!(
                 user_id = self.other_user_id().as_str(),
                 device_id = self.other_device_id().as_str(),
@@ -385,12 +386,14 @@ impl Sas {
 
         if done {
             match self.mark_as_done().await? {
-                VerificationResult::Cancel(c) => Ok((self.cancel_with_code(c), None)),
-                VerificationResult::Ok => Ok((mac_request, None)),
-                VerificationResult::SignatureUpload(r) => Ok((mac_request, Some(r))),
+                VerificationResult::Cancel(c) => {
+                    Ok((self.cancel_with_code(c).into_iter().collect(), None))
+                }
+                VerificationResult::Ok => Ok((mac_requests, None)),
+                VerificationResult::SignatureUpload(r) => Ok((mac_requests, Some(r))),
             }
         } else {
-            Ok((mac_request, None))
+            Ok((mac_requests, None))
         }
     }
 
@@ -650,12 +653,16 @@ mod test {
         assert_eq!(alice.emoji().unwrap(), bob.emoji().unwrap());
         assert_eq!(alice.decimals().unwrap(), bob.decimals().unwrap());
 
-        let request = alice.confirm().await.unwrap().0.unwrap();
+        let mut requests = alice.confirm().await.unwrap().0;
+        assert!(requests.len() == 1);
+        let request = requests.pop().unwrap();
         let content = OutgoingContent::try_from(request).unwrap();
         let content = MacContent::try_from(&content).unwrap();
         bob.receive_any_event(alice.user_id(), &content.into());
 
-        let request = bob.confirm().await.unwrap().0.unwrap();
+        let mut requests = bob.confirm().await.unwrap().0;
+        assert!(requests.len() == 1);
+        let request = requests.pop().unwrap();
         let content = OutgoingContent::try_from(request).unwrap();
         let content = MacContent::try_from(&content).unwrap();
         alice.receive_any_event(bob.user_id(), &content.into());

crates/matrix-sdk/src/encryption/verification/sas.rs

@@ -76,9 +76,9 @@ impl SasVerification {
 
     /// Confirm that the short auth strings match on both sides.
     pub async fn confirm(&self) -> Result<()> {
-        let (request, signature) = self.inner.confirm().await?;
+        let (requests, signature) = self.inner.confirm().await?;
 
-        if let Some(request) = request {
+        for request in requests {
             self.client.send_verification_request(request).await?;
         }