To add restriction check for Wi-Fi Tethering

Bug: 203168953
Test: make RunSettingsLibRoboTests ROBOTEST_FILTER=WifiEnterpriseRestrictionUtilsTest
Change-Id: I49f3197ce79c2ef60b73b6ff079a8aa7f86356cc

packages/SettingsLib/src/com/android/settingslib/wifi/WifiEnterpriseRestrictionUtils.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2021 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.settingslib.wifi;
+
+import android.content.Context;
+import android.os.Build;
+import android.os.Bundle;
+import android.os.UserManager;
+import android.util.Log;
+
+import androidx.annotation.ChecksSdkIntAtLeast;
+
+/* Utility class is to confirm the Wi-Fi function is available by enterprise restriction */
+public class WifiEnterpriseRestrictionUtils {
+    private static final String TAG = "WifiEntResUtils";
+
+    /**
+     * Confirm Wi-Fi tethering is available according to whether user restriction is set
+     *
+     * @param context A context
+     * @return whether the device is permitted to use Wi-Fi Tethering
+     */
+    public static boolean isWifiTetheringAllowed(Context context) {
+        final UserManager userManager = context.getSystemService(UserManager.class);
+        final Bundle restrictions = userManager.getUserRestrictions();
+        if (isAtLeastT() && restrictions.getBoolean(UserManager.DISALLOW_WIFI_TETHERING)) {
+            Log.i(TAG, "Wi-Fi Tethering isn't available due to user restriction.");
+            return false;
+        }
+        return true;
+    }
+
+    @ChecksSdkIntAtLeast(api=Build.VERSION_CODES.TIRAMISU)
+    private static boolean isAtLeastT() {
+        return Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU;
+    }
+}

packages/SettingsLib/tests/robotests/src/com/android/settingslib/wifi/WifiEnterpriseRestrictionUtilsTest.java

@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2021 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.settingslib.wifi;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.when;
+
+import android.content.Context;
+import android.os.Build;
+import android.os.Bundle;
+import android.os.UserManager;
+
+import androidx.test.core.app.ApplicationProvider;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.util.ReflectionHelpers;
+
+@RunWith(RobolectricTestRunner.class)
+public class WifiEnterpriseRestrictionUtilsTest {
+
+    private Context mContext;
+    @Mock
+    private UserManager mUserManager;
+    @Mock
+    private Bundle mBundle;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mContext = spy(ApplicationProvider.getApplicationContext());
+        when(mContext.getSystemService(UserManager.class)).thenReturn(mUserManager);
+        when(mUserManager.getUserRestrictions()).thenReturn(mBundle);
+    }
+
+    @Test
+    public void isWifiTetheringAllowed_setSDKForS_shouldReturnTrue() {
+        ReflectionHelpers.setStaticField(Build.VERSION.class, "SDK_INT", Build.VERSION_CODES.S);
+        when(mBundle.getBoolean(UserManager.DISALLOW_WIFI_TETHERING)).thenReturn(true);
+
+        assertThat(WifiEnterpriseRestrictionUtils.isWifiTetheringAllowed(mContext)).isTrue();
+    }
+
+    @Test
+    public void isWifiTetheringAllowed_setSDKForTAndDisallowForRestriction_shouldReturnFalse() {
+        ReflectionHelpers.setStaticField(
+                Build.VERSION.class, "SDK_INT", Build.VERSION_CODES.TIRAMISU);
+        when(mBundle.getBoolean(UserManager.DISALLOW_WIFI_TETHERING)).thenReturn(true);
+
+        assertThat(WifiEnterpriseRestrictionUtils.isWifiTetheringAllowed(mContext)).isFalse();
+    }
+
+    @Test
+    public void isWifiTetheringAllowed_setSDKForTAndAllowForRestriction_shouldReturnTrue() {
+        ReflectionHelpers.setStaticField(
+            Build.VERSION.class, "SDK_INT", Build.VERSION_CODES.TIRAMISU);
+        when(mBundle.getBoolean(UserManager.DISALLOW_WIFI_TETHERING)).thenReturn(false);
+
+        assertThat(WifiEnterpriseRestrictionUtils.isWifiTetheringAllowed(mContext)).isTrue();
+    }
+}