Adding support for FirebaseUser.unlink(providerId)

* Unlink an auth provider from a user account

Author: ko2ic

packages/firebase_auth/CHANGELOG.md

@@ -1,6 +1,7 @@
 ## 0.6.2
 
 * Add access to user metadata.
+* Adding support for FirebaseUser.unlink(providerId)
 
 ## 0.6.1
 

packages/firebase_auth/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java

@@ -113,6 +113,8 @@ public void onMethodCall(MethodCall call, Result result) {
         break;
       case "linkWithTwitterCredential":
         handleLinkWithTwitterCredential(call, result);
+      case "unlink":
+        handleUnlink(call, result);
         break;
       case "updateEmail":
         handleUpdateEmail(call, result);
@@ -418,6 +420,15 @@ private void handleSignInWithCustomToken(MethodCall call, final Result result) {
         .addOnCompleteListener(new SignInCompleteListener(result));
   }
 
+  private void handleUnlink(MethodCall call, final Result result) {
+    Map<String, String> arguments = call.arguments();
+    String providerId = arguments.get("providerId");
+    firebaseAuth
+        .getCurrentUser()
+        .unlink(providerId)
+        .addOnCompleteListener(new SignInCompleteListener(result));
+  }
+
   private void handleSignOut(MethodCall call, final Result result) {
     firebaseAuth.signOut();
     result.success(null);

packages/firebase_auth/ios/Classes/FirebaseAuthPlugin.m

@@ -185,6 +185,12 @@ - (void)handleMethodCall:(FlutterMethodCall *)call result:(FlutterResult)result
                                         completion:^(FIRUser *user, NSError *error) {
                                           [self sendResult:result forUser:user error:error];
                                         }];
+  } else if ([@"unlink" isEqualToString:call.method]) {
+    NSString *providerId = call.arguments[@"providerId"];
+    [[FIRAuth auth].currentUser unlinkFromProvider:providerId
+                                        completion:^(FIRUser *user, NSError *error) {
+                                          [self sendResult:result forUser:user error:error];
+                                        }];
   } else if ([@"updateEmail" isEqualToString:call.method]) {
     NSString *email = call.arguments[@"email"];
     [[FIRAuth auth].currentUser updateEmail:email
@@ -197,7 +203,6 @@ - (void)handleMethodCall:(FlutterMethodCall *)call result:(FlutterResult)result
                                     completion:^(NSError *error) {
                                       [self sendResult:result forUser:nil error:error];
                                     }];
-
   } else if ([@"updateProfile" isEqualToString:call.method]) {
     FIRUserProfileChangeRequest *changeRequest = [[FIRAuth auth].currentUser profileChangeRequest];
     if (call.arguments[@"displayName"]) {

packages/firebase_auth/lib/firebase_auth.dart

@@ -463,6 +463,19 @@ class FirebaseAuth {
     return currentUser;
   }
 
+  Future<FirebaseUser> unlink({
+    @required String providerId,
+  }) async {
+    final Map<dynamic, dynamic> data = await channel.invokeMethod(
+      'unlink',
+      <String, String>{
+        'providerId': providerId,
+      },
+    );
+    final FirebaseUser currentUser = FirebaseUser._(data);
+    return currentUser;
+  }
+
   /// Sets the user-facing language code for auth operations that can be
   /// internationalized, such as [sendEmailVerification]. This language
   /// code should follow the conventions defined by the IETF in BCP47.

packages/firebase_auth/test/firebase_auth_test.dart

@@ -268,6 +268,24 @@ void main() {
       );
     });
 
+    test('unlink', () async {
+      final FirebaseUser user = await auth.unlink(
+        providerId: kMockProviderId,
+      );
+      verifyUser(user);
+      expect(
+        log,
+        <Matcher>[
+          isMethodCall(
+            'unlink',
+            arguments: <String, String>{
+              'providerId': kMockProviderId,
+            },
+          ),
+        ],
+      );
+    });
+
     test('signInWithFacebook', () async {
       final FirebaseUser user = await auth.signInWithFacebook(
         accessToken: kMockAccessToken,