1 files changed, 60 insertions, 0 deletions
diff --git a/java/com/android/voicemail/VoicemailPermissionHelper.java b/java/com/android/voicemail/VoicemailPermissionHelper.java
new file mode 100644
index 000000000..1a09d45fd
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+++ b/java/com/android/voicemail/VoicemailPermissionHelper.java
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+/*
+ * Copyright (C) 2017 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.voicemail;
+
+import android.Manifest.permission;
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.support.annotation.NonNull;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Handles permission checking for the voicemail module. Currently "phone" and "sms" permissions are
+ * required.
+ */
+public class VoicemailPermissionHelper {
+
+  /** *_VOICEMAIL permissions are auto-granted by being the default dialer. */
+  private static final String[] VOICEMAIL_PERMISSIONS = {
+    permission.ADD_VOICEMAIL,
+    permission.WRITE_VOICEMAIL,
+    permission.READ_VOICEMAIL,
+    permission.READ_PHONE_STATE,
+    permission.SEND_SMS
+  };
+
+  /**
+   * Returns {@code true} if the app has all permissions required for the voicemail module to
+   * operate.
+   */
+  public static boolean hasPermissions(Context context) {
+    return getMissingPermissions(context).isEmpty();
+  }
+
+  /** Returns a list of permission that is missing for the voicemail module to operate. */
+  @NonNull
+  public static List<String> getMissingPermissions(Context context) {
+    List<String> result = new ArrayList<>();
+    for (String permission : VOICEMAIL_PERMISSIONS) {
+      if (context.checkSelfPermission(permission) != PackageManager.PERMISSION_GRANTED) {
+        result.add(permission);
+      }
+    }
+    return result;
+  }
+}