feat: introduce CredentialProviderService minimal implementation

play-services-core/src/main/AndroidManifest.xml

@@ -15,6 +15,7 @@
   -->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools">
+    <uses-permission android:name="android.permission.PROVIDE_DEFAULT_ENABLED_CREDENTIAL_SERVICE" />
 
     <permission
         android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"
@@ -579,6 +580,23 @@
             </intent-filter>
         </service>
 
+        <service
+            android:name="org.microg.gms.credential.CredentialProviderService"
+            android:exported="true"
+            android:permission="android.permission.BIND_CREDENTIAL_PROVIDER_SERVICE"
+            android:label="@string/gms_app_name">
+            <intent-filter>
+                <action android:name="android.service.credentials.CredentialProviderService" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+            <meta-data
+                android:name="android.credentials.provider"
+                android:resource="@xml/credential_provider_platform" />
+            <meta-data
+                android:name="android.service.credentials.CredentialProviderService"
+                android:resource="@xml/credential_provider_platform" />
+        </service>
+
         <activity
             android:name="org.microg.gms.auth.signin.AuthSignInActivity"
             android:theme="@style/Theme.App.DayNight.Dialog.Alert.NoActionBar"

play-services-core/src/main/kotlin/org/microg/gms/credential/CredentialProviderService.kt

@@ -0,0 +1,62 @@
+/*
+ * SPDX-FileCopyrightText: 2025 microG Project Team
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package org.microg.gms.credential
+
+import android.credentials.ClearCredentialStateException
+import android.credentials.CreateCredentialException
+import android.credentials.GetCredentialException
+import android.os.Build
+import android.os.CancellationSignal
+import android.os.OutcomeReceiver
+import android.service.credentials.BeginCreateCredentialRequest
+import android.service.credentials.BeginCreateCredentialResponse
+import android.service.credentials.BeginGetCredentialRequest
+import android.service.credentials.BeginGetCredentialResponse
+import android.service.credentials.ClearCredentialStateRequest
+import android.service.credentials.CredentialProviderService
+import android.util.Log
+import androidx.annotation.RequiresApi
+
+@RequiresApi(Build.VERSION_CODES.UPSIDE_DOWN_CAKE)
+class CredentialProviderService : CredentialProviderService() {
+    override fun onCreate() {
+        super.onCreate()
+        Log.d(TAG, "onCreate")
+    }
+
+    @RequiresApi(Build.VERSION_CODES.UPSIDE_DOWN_CAKE)
+    override fun onBeginGetCredential(
+        request: BeginGetCredentialRequest,
+        cancellationSignal: CancellationSignal,
+        callback: OutcomeReceiver<BeginGetCredentialResponse, GetCredentialException>
+    ) {
+        Log.d(TAG, "onBeginGetCredential")
+        callback.onError(GetCredentialException(GetCredentialException.TYPE_NO_CREDENTIAL))
+    }
+
+    @RequiresApi(Build.VERSION_CODES.UPSIDE_DOWN_CAKE)
+    override fun onBeginCreateCredential(
+        request: BeginCreateCredentialRequest,
+        cancellationSignal: CancellationSignal,
+        callback: OutcomeReceiver<BeginCreateCredentialResponse, CreateCredentialException>
+    ) {
+        Log.d(TAG, "onBeginCreateCredential")
+        callback.onError(CreateCredentialException(CreateCredentialException.TYPE_NO_CREATE_OPTIONS))
+    }
+
+    override fun onClearCredentialState(
+        request: ClearCredentialStateRequest,
+        cancellationSignal: CancellationSignal,
+        callback: OutcomeReceiver<Void, ClearCredentialStateException>
+    ) {
+        Log.d(TAG, "onClearCredentialState")
+        callback.onResult(null)
+    }
+
+    companion object {
+        private const val TAG = "CredentialProvider"
+    }
+}

play-services-core/src/main/res/values/strings.xml

@@ -456,4 +456,6 @@ Please set up a password, PIN, or pattern lock screen."</string>
     <string name="location_sharing_turn_off_confirm">Turn off</string>
     <string name="location_sharing_confirm_dialog_title">Enable Location Sharing</string>
     <string name="location_sharing_confirm_dialog_text">People you share your location with can always see:\n·Your name and photo\n·Your device\'s recent location,even when you\'re not using a Google service\n·Your device\'s battery power,and if it\'s charging\n·Your arrival and departure time,if they add a Location Sharing notification</string>
+
+    <string name="credential_provider_subtitle">microG credential provider</string>
 </resources>

play-services-core/src/main/res/xml/credential_provider_platform.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<credential-provider xmlns:android="http://schemas.android.com/apk/res/android"
+    android:settingsSubtitle="@string/credential_provider_subtitle">
+    <capabilities>
+        <capability>android.credentials.TYPE_PASSWORD_CREDENTIAL</capability>
+        <capability>android.credentials.TYPE_PUBLIC_KEY_CREDENTIAL</capability>
+    </capabilities>
+</credential-provider>