feat(auth): move to Pigeon for Platform channels

melos.yaml

@@ -194,14 +194,14 @@ scripts:
       melos run generate:pigeon:macos --no-select && \
       melos run format --no-select
     packageFilters:
-      file-exists: 'pigeons/messages.dart'
+      fileExists: 'pigeons/messages.dart'
     description: Generate the pigeon messages for all the supported packages.
 
   generate:pigeon:macos:
     run: |
       melos exec -- "sed -i '' 's;#import <Flutter/Flutter.h>;#if TARGET_OS_OSX\n#import <FlutterMacOS/FlutterMacOS.h>\n#else\n#import <Flutter/Flutter.h>\n#endif;g' ios/Classes/messages.g.m"
     packageFilters:
-      file-exists: 'ios/Classes/messages.g.m'
+      fileExists: 'ios/Classes/messages.g.m'
     description: Pigeon does not add the condition to import Flutter or FlutterMacOs. Add the condition
 
   odm:test:

packages/firebase_auth/firebase_auth/android/src/main/java/io/flutter/plugins/firebase/auth/FlutterFirebaseAuthUser.java

@@ -0,0 +1,64 @@
+package io.flutter.plugins.firebase.auth;
+
+import androidx.annotation.NonNull;
+import com.google.android.gms.tasks.Tasks;
+import com.google.firebase.FirebaseApp;
+import com.google.firebase.auth.FirebaseAuth;
+import com.google.firebase.auth.FirebaseUser;
+import com.google.firebase.auth.GetTokenResult;
+
+public class FlutterFirebaseAuthUser
+    implements GeneratedAndroidFirebaseAuth.FirebaseAuthUserHostApi {
+
+  private FirebaseUser getCurrentUserFromPigeon(
+      @NonNull GeneratedAndroidFirebaseAuth.PigeonFirebaseApp pigeonApp) {
+    FirebaseApp app = FirebaseApp.getInstance(pigeonApp.getAppName());
+    FirebaseAuth auth = FirebaseAuth.getInstance(app);
+    if (pigeonApp.getTenantId() != null) {
+      auth.setTenantId(pigeonApp.getTenantId());
+    }
+
+    return auth.getCurrentUser();
+  }
+
+  @Override
+  public void delete(
+      @NonNull GeneratedAndroidFirebaseAuth.PigeonFirebaseApp app,
+      @NonNull GeneratedAndroidFirebaseAuth.Result<Void> result) {
+    try {
+      FirebaseUser firebaseUser = getCurrentUserFromPigeon(app);
+
+      if (firebaseUser == null) {
+        result.error(FlutterFirebaseAuthPluginException.noUser());
+        return;
+      }
+
+      Tasks.await(firebaseUser.delete());
+      result.success(null);
+    } catch (Exception e) {
+      result.error(e);
+    }
+  }
+
+  @Override
+  public void getIdToken(
+      @NonNull GeneratedAndroidFirebaseAuth.PigeonFirebaseApp app,
+      @NonNull Boolean forceRefresh,
+      @NonNull
+          GeneratedAndroidFirebaseAuth.Result<GeneratedAndroidFirebaseAuth.PigeonIdTokenResult>
+              result) {
+    try {
+      FirebaseUser firebaseUser = getCurrentUserFromPigeon(app);
+
+      if (firebaseUser == null) {
+        result.error(FlutterFirebaseAuthPluginException.noUser());
+        return;
+      }
+
+      GetTokenResult tokenResult = Tasks.await(firebaseUser.getIdToken(forceRefresh));
+      result.success(PigeonParser.parseTokenResult(tokenResult));
+    } catch (Exception e) {
+      result.error(e);
+    }
+  }
+}