Apply admin restriction when network reset is disallowed

- Refactored network restriction checking logic into a checker class to
share across different places
- Added test

Test: make RunSettingsRoboTests
Change-Id: I6b7ea78f28fd1b61aacb070c377821150e441a74
Fix: 37134598

src/com/android/settings/network/NetworkResetRestrictionChecker.java

@@ -0,0 +1,53 @@
+/*
+ * 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.settings.network;
+
+import android.content.Context;
+import android.os.UserHandle;
+import android.os.UserManager;
+import android.support.annotation.VisibleForTesting;
+
+import com.android.settingslib.RestrictedLockUtils;
+
+public class NetworkResetRestrictionChecker {
+
+    private final Context mContext;
+    private final UserManager mUserManager;
+
+    public NetworkResetRestrictionChecker(Context context) {
+        mContext = context;
+        mUserManager = (UserManager) context.getSystemService(Context.USER_SERVICE);
+    }
+
+    @VisibleForTesting(otherwise = VisibleForTesting.PRIVATE)
+    boolean hasUserBaseRestriction() {
+        return RestrictedLockUtils.hasBaseUserRestriction(mContext,
+                UserManager.DISALLOW_NETWORK_RESET, UserHandle.myUserId());
+    }
+
+    @VisibleForTesting(otherwise = VisibleForTesting.PRIVATE)
+    boolean isRestrictionEnforcedByAdmin() {
+        return RestrictedLockUtils.checkIfRestrictionEnforced(
+                mContext, UserManager.DISALLOW_NETWORK_RESET, UserHandle.myUserId()) != null;
+    }
+
+    boolean hasRestriction() {
+        return !mUserManager.isAdminUser()
+                || hasUserBaseRestriction()
+                || isRestrictionEnforcedByAdmin();
+    }
+}