[DO NOT MERGE] Verify ringtone from ringtone picker is audio

To improve privacy.

Bug: 221041256
Test: atest com.android.settings.DefaultRingtonePreferenceTest
Change-Id: I0a9ca163f5ae91b67c9f957fde4c6db326b8718d
Merged-In: I0a9ca163f5ae91b67c9f957fde4c6db326b8718d
(cherry picked from commit e4c22580c9)

src/com/android/settings/DefaultRingtonePreference.java

@@ -22,6 +22,9 @@ import android.content.Intent;
 import android.media.RingtoneManager;
 import android.net.Uri;
 import android.util.AttributeSet;
+import android.util.Log;
+
+import androidx.annotation.VisibleForTesting;
 
 public class DefaultRingtonePreference extends RingtonePreference {
     private static final String TAG = "DefaultRingtonePreference";
@@ -43,6 +46,24 @@ public class DefaultRingtonePreference extends RingtonePreference {
 
     @Override
     protected void onSaveRingtone(Uri ringtoneUri) {
+        String mimeType = getContext().getContentResolver().getType(ringtoneUri);
+        if (mimeType == null) {
+            Log.e(TAG, "onSaveRingtone for URI:" + ringtoneUri
+                    + " ignored: failure to find mimeType (no access from this context?)");
+            return;
+        }
+
+        if (!(mimeType.startsWith("audio/") || mimeType.equals("application/ogg"))) {
+            Log.e(TAG, "onSaveRingtone for URI:" + ringtoneUri
+                    + " ignored: associated mimeType:" + mimeType + " is not an audio type");
+            return;
+        }
+
+        setActualDefaultRingtoneUri(ringtoneUri);
+    }
+
+    @VisibleForTesting
+    void setActualDefaultRingtoneUri(Uri ringtoneUri) {
         RingtoneManager.setActualDefaultRingtoneUri(mUserContext, getRingtoneType(), ringtoneUri);
     }
 

tests/unit/Android.bp

@@ -17,6 +17,7 @@ android_test {
         "androidx.test.espresso.core",
         "androidx.test.espresso.contrib-nodeps",
         "androidx.test.espresso.intents-nodeps",
+        "androidx.test.ext.junit",
         "mockito-target-minus-junit4",
         "platform-test-annotations",
         "truth-prebuilt",

tests/unit/src/com/android/settings/DefaultRingtonePreferenceTest.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings;
+
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.content.ContentResolver;
+import android.content.Context;
+import android.media.RingtoneManager;
+import android.net.Uri;
+
+import androidx.test.core.app.ApplicationProvider;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+/** Unittest for DefaultRingtonePreference. */
+@RunWith(AndroidJUnit4.class)
+public class DefaultRingtonePreferenceTest {
+
+    private DefaultRingtonePreference mDefaultRingtonePreference;
+
+    @Mock
+    private ContentResolver mContentResolver;
+    @Mock
+    private Uri mRingtoneUri;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+
+        Context context = spy(ApplicationProvider.getApplicationContext());
+        doReturn(mContentResolver).when(context).getContentResolver();
+
+        mDefaultRingtonePreference = spy(new DefaultRingtonePreference(context, null /* attrs */));
+        doReturn(context).when(mDefaultRingtonePreference).getContext();
+        when(mDefaultRingtonePreference.getRingtoneType())
+                .thenReturn(RingtoneManager.TYPE_RINGTONE);
+        mDefaultRingtonePreference.setUserId(1);
+    }
+
+    @Test
+    public void onSaveRingtone_nullMimeType_shouldNotSetRingtone() {
+        when(mContentResolver.getType(mRingtoneUri)).thenReturn(null);
+
+        mDefaultRingtonePreference.onSaveRingtone(mRingtoneUri);
+
+        verify(mDefaultRingtonePreference, never()).setActualDefaultRingtoneUri(mRingtoneUri);
+    }
+
+    @Test
+    public void onSaveRingtone_notAudioMimeType_shouldNotSetRingtone() {
+        when(mContentResolver.getType(mRingtoneUri)).thenReturn("text/plain");
+
+        mDefaultRingtonePreference.onSaveRingtone(mRingtoneUri);
+
+        verify(mDefaultRingtonePreference, never()).setActualDefaultRingtoneUri(mRingtoneUri);
+    }
+}