Add cancel methods and rename callback method

bindings/matrix-sdk-crypto-ffi/src/olm.udl

@@ -162,7 +162,7 @@ interface Sas {
     sequence<i32>? get_emoji_indices();
     sequence<i32>? get_decimals();
 
-    void changes(SasListener callback);
+    void set_changes_listener(SasListener callback);
     SasState state();
 };
 
@@ -192,6 +192,7 @@ interface QrCode {
     string? room_id();
     boolean we_started();
     boolean is_done();
+    boolean is_cancelled();
     CancelInfo? cancel_info();
 
     boolean reciprocated();
@@ -211,6 +212,8 @@ interface VerificationRequest {
     boolean is_ready();
     boolean is_done();
     boolean is_passive();
+    boolean is_cancelled();
+    CancelInfo? cancel_info();
 
     sequence<string>? their_supported_methods();
     sequence<string>? our_supported_methods();
@@ -223,6 +226,8 @@ interface VerificationRequest {
     [Throws=CryptoStoreError]
     QrCode? start_qr_verification();
     ScanResult? scan_qr_code([ByRef] string data);
+
+    OutgoingVerificationRequest? cancel();
 };
 
 dictionary RequestVerificationResult {

bindings/matrix-sdk-crypto-ffi/src/verification.rs

@@ -194,7 +194,7 @@ impl Sas {
         self.inner.decimals().map(|v| [v.0.into(), v.1.into(), v.2.into()].to_vec())
     }
 
-    /// Listen for changes in the SAS verification process.
+    /// Set a listener for changes in the SAS verification process.
     ///
     /// The given callback will be called whenever the state changes.
     ///
@@ -239,7 +239,7 @@ impl Sas {
     ///                │  Done │
     ///                └───────┘
     /// ```
-    pub fn changes(&self, callback: Box<dyn SasListener>) {
+    pub fn set_changes_listener(&self, callback: Box<dyn SasListener>) {
         let stream = self.inner.changes();
 
         self.runtime.spawn(Self::changes_callback(stream, callback));
@@ -302,6 +302,11 @@ impl QrCode {
         self.inner.is_done()
     }
 
+    /// Has the verification flow been cancelled.
+    pub fn is_cancelled(&self) -> bool {
+        self.inner.is_cancelled()
+    }
+
     /// Did we initiate the verification flow.
     pub fn we_started(&self) -> bool {
         self.inner.we_started()
@@ -469,6 +474,17 @@ impl VerificationRequest {
         self.inner.is_passive()
     }
 
+    /// Has the verification flow that been cancelled.
+    pub fn is_cancelled(&self) -> bool {
+        self.inner.is_cancelled()
+    }
+
+    /// Get info about the cancellation if the verification request has been
+    /// cancelled.
+    pub fn cancel_info(&self) -> Option<CancelInfo> {
+        self.inner.cancel_info().map(|v| v.into())
+    }
+
     /// Get the supported verification methods of the other side.
     ///
     /// Will be present only if the other side requested the verification or if