Bug 1813778 - implement WebAuthn isConditionalMediationAvailable. r=keeler,webidl,saschanaz

Differential Revision: https://phabricator.services.mozilla.com/D188137

dom/webauthn/PublicKeyCredential.cpp

@@ -145,6 +145,19 @@ PublicKeyCredential::IsUserVerifyingPlatformAuthenticatorAvailable(
   return promise.forget();
 }
 
+/* static */
+already_AddRefed<Promise> PublicKeyCredential::IsConditionalMediationAvailable(
+    GlobalObject& aGlobal, ErrorResult& aError) {
+  RefPtr<Promise> promise =
+      Promise::Create(xpc::CurrentNativeGlobal(aGlobal.Context()), aError);
+  if (aError.Failed()) {
+    return nullptr;
+  }
+  // Support for conditional mediation will be added in Bug 1838932
+  promise->MaybeResolve(false);
+  return promise.forget();
+}
+
 /* static */
 already_AddRefed<Promise>
 PublicKeyCredential::IsExternalCTAP2SecurityKeySupported(GlobalObject& aGlobal,

dom/webauthn/PublicKeyCredential.h

@@ -49,6 +49,9 @@ class PublicKeyCredential final : public Credential {
   IsUserVerifyingPlatformAuthenticatorAvailable(GlobalObject& aGlobal,
                                                 ErrorResult& aError);
 
+  static already_AddRefed<Promise> IsConditionalMediationAvailable(
+      GlobalObject& aGlobal, ErrorResult& aError);
+
   static already_AddRefed<Promise> IsExternalCTAP2SecurityKeySupported(
       GlobalObject& aGlobal, ErrorResult& aError);
 

dom/webidl/WebAuthentication.webidl

@@ -15,6 +15,7 @@ interface PublicKeyCredential : Credential {
     [SameObject, Throws] readonly attribute ArrayBuffer      rawId;
     [SameObject] readonly attribute AuthenticatorResponse    response;
     AuthenticationExtensionsClientOutputs getClientExtensionResults();
+    [NewObject] static Promise<boolean> isConditionalMediationAvailable();
     [Throws] object toJSON();
 };
 

testing/web-platform/meta/webauthn/conditional-mediation.https.html.ini

@@ -1,6 +1,3 @@
 [conditional-mediation.https.html]
   [Conditional mediation supported]
     expected: FAIL
-
-  [Conditional mediation not supported]
-    expected: FAIL