Guard slices from being requested by guest user

According to patch of A-231987122, AOSP restricts app to modify relevant
mobile settings when user is a guest. This change intends to prevent the
slices related to mobile settings from being requested by guest user.

Bug: 278616139
Bug: 277333776
Bug: 262244832
Bug: 278616520
Bug: 278615120
Test: robotests
Change-Id: I4dc4bbfdb5cf76e188e6f62ebfd74ef6fa2fe33b

src/com/android/settings/slices/RestrictedSliceUtils.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2023 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.slices;
+
+import android.content.ContentResolver;
+import android.net.Uri;
+import android.provider.SettingsSlicesContract;
+
+/**
+ * A utility class to check slice Uris for restriction.
+ */
+public class RestrictedSliceUtils {
+
+    /**
+     * Uri for the notifying open networks Slice.
+     */
+    private static final Uri NOTIFY_OPEN_NETWORKS_SLICE_URI = new Uri.Builder()
+        .scheme(ContentResolver.SCHEME_CONTENT)
+        .authority(SettingsSliceProvider.SLICE_AUTHORITY)
+        .appendPath(SettingsSlicesContract.PATH_SETTING_ACTION)
+        .appendPath("notify_open_networks")
+        .build();
+
+    /**
+     * Uri for the auto turning on Wi-Fi Slice.
+     */
+    private static final Uri AUTO_TURN_ON_WIFI_SLICE_URI = new Uri.Builder()
+        .scheme(ContentResolver.SCHEME_CONTENT)
+        .authority(SettingsSliceProvider.SLICE_AUTHORITY)
+        .appendPath(SettingsSlicesContract.PATH_SETTING_ACTION)
+        .appendPath("enable_wifi_wakeup")
+        .build();
+
+    /**
+     * Uri for the usb tethering Slice.
+     */
+    private static final Uri USB_TETHERING_SLICE_URI = new Uri.Builder()
+        .scheme(ContentResolver.SCHEME_CONTENT)
+        .authority(SettingsSliceProvider.SLICE_AUTHORITY)
+        .appendPath(SettingsSlicesContract.PATH_SETTING_ACTION)
+        .appendPath("enable_usb_tethering")
+        .build();
+
+    /**
+     * Uri for the bluetooth tethering Slice.
+     */
+    private static final Uri BLUETOOTH_TETHERING_SLICE_URI = new Uri.Builder()
+        .scheme(ContentResolver.SCHEME_CONTENT)
+        .authority(SettingsSliceProvider.SLICE_AUTHORITY)
+        .appendPath(SettingsSlicesContract.PATH_SETTING_ACTION)
+        .appendPath("enable_bluetooth_tethering_2")
+        .build();
+
+    /**
+     * Returns true if the slice Uri restricts access to guest user.
+     */
+    public static boolean isGuestRestricted(Uri sliceUri) {
+        if (AUTO_TURN_ON_WIFI_SLICE_URI.equals(sliceUri)
+            || NOTIFY_OPEN_NETWORKS_SLICE_URI.equals(sliceUri)
+            || BLUETOOTH_TETHERING_SLICE_URI.equals(sliceUri)
+            || USB_TETHERING_SLICE_URI.equals(sliceUri)
+            || CustomSliceRegistry.MOBILE_DATA_SLICE_URI.equals(sliceUri)) {
+            return true;
+        }
+        return false;
+    }
+}

src/com/android/settings/slices/SettingsSliceProvider.java

@@ -30,6 +30,7 @@ import android.content.pm.PackageManager;
 import android.net.Uri;
 import android.os.Binder;
 import android.os.StrictMode;
+import android.os.UserManager;
 import android.provider.Settings;
 import android.provider.SettingsSlicesContract;
 import android.text.TextUtils;
@@ -233,6 +234,14 @@ public class SettingsSliceProvider extends SliceProvider {
                 getContext().getTheme().rebase();
             }
 
+            // Checking if some semi-sensitive slices are requested by a guest user. If so, will
+            // return an empty slice.
+            final UserManager userManager = getContext().getSystemService(UserManager.class);
+            if (userManager.isGuestUser() && RestrictedSliceUtils.isGuestRestricted(sliceUri)) {
+                Log.i(TAG, "Guest user access denied.");
+                return null;
+            }
+
             // Before adding a slice to {@link CustomSliceManager}, please get approval
             // from the Settings team.
             if (CustomSliceRegistry.isValidUri(sliceUri)) {

tests/robotests/src/com/android/settings/slices/SettingsSliceProviderTest.java

@@ -119,6 +119,7 @@ public class SettingsSliceProviderTest {
     private Context mContext;
     private SettingsSliceProvider mProvider;
     private ShadowPackageManager mPackageManager;
+    private ShadowUserManager mShadowUserManager;
 
     @Mock
     private SliceManager mManager;
@@ -157,6 +158,7 @@ public class SettingsSliceProviderTest {
         when(mManager.getPinnedSlices()).thenReturn(Collections.emptyList());
 
         mPackageManager = Shadows.shadowOf(mContext.getPackageManager());
+        mShadowUserManager = ShadowUserManager.getShadow();
 
         SliceProvider.setSpecs(SliceLiveData.SUPPORTED_SPECS);
     }
@@ -292,6 +294,37 @@ public class SettingsSliceProviderTest {
         assertThat(ShadowTheme.isThemeRebased()).isFalse();
     }
 
+    @Test
+    public void onBindSlice_guestRestricted_returnsNull() {
+        final String key = "enable_usb_tethering";
+        mShadowUserManager.setGuestUser(true);
+        final Uri testUri = new Uri.Builder()
+            .scheme(ContentResolver.SCHEME_CONTENT)
+            .authority(SettingsSliceProvider.SLICE_AUTHORITY)
+            .appendPath(SettingsSlicesContract.PATH_SETTING_ACTION)
+            .appendPath(key)
+            .build();
+
+        final Slice slice = mProvider.onBindSlice(testUri);
+
+        assertThat(slice).isNull();
+    }
+
+    @Test
+    public void onBindSlice_notGuestRestricted_returnsNotNull() {
+        final String key = "enable_usb_tethering";
+        final Uri testUri = new Uri.Builder()
+            .scheme(ContentResolver.SCHEME_CONTENT)
+            .authority(SettingsSliceProvider.SLICE_AUTHORITY)
+            .appendPath(SettingsSlicesContract.PATH_SETTING_ACTION)
+            .appendPath(key)
+            .build();
+
+        final Slice slice = mProvider.onBindSlice(testUri);
+
+        assertThat(slice).isNotNull();
+    }
+
     @Test
     public void getDescendantUris_fullActionUri_returnsSelf() {
         final Collection<Uri> descendants = mProvider.onGetSliceDescendants(ACTION_SLICE_URI);

tests/robotests/src/com/android/settings/testutils/shadow/ShadowUserManager.java

@@ -55,6 +55,7 @@ public class ShadowUserManager extends org.robolectric.shadows.ShadowUserManager
     private int[] profileIdsForUser = new int[0];
     private boolean mUserSwitchEnabled;
     private Bundle mDefaultGuestUserRestriction = new Bundle();
+    private boolean mIsGuestUser = false;
 
     private @UserManager.UserSwitchabilityResult int mSwitchabilityStatus =
             UserManager.SWITCHABILITY_STATUS_OK;
@@ -270,4 +271,13 @@ public class ShadowUserManager extends org.robolectric.shadows.ShadowUserManager
             mUserProfileInfos.get(i).flags |= UserInfo.FLAG_ADMIN;
         }
     }
+
+    @Implementation
+    protected boolean isGuestUser() {
+        return mIsGuestUser;
+    }
+
+    public void setGuestUser(boolean isGuestUser) {
+        mIsGuestUser = isGuestUser;
+    }
 }