Adding Wifi setting to special_access settings

In the settings app, allow users to override app permission for
CHANGE_WIFI_STATE for every application that declared that permission.

Bug: 70562620
Test: compile, robotests

Manual test:
Flash build to device (walleye)
Download iPass from playstore
Open iPass and try connect to a wifi network; verify success
Open settings -> Apps & notifications -> Advanced -> Special app access
-> Wifi access
Select iPass from the list
Toggle the switch to off
Open iPass and try connect to a wifi network; verify failure

Change-Id: Ib2be4c83988a81ba7831d096c9b1980462e66903

src/com/android/settings/wifi/ChangeWifiStateDetails.java

@@ -0,0 +1,141 @@
+/*
+ * Copyright (C) 2018 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.wifi;
+
+import android.Manifest.permission;
+import android.app.AlertDialog;
+import android.app.AppOpsManager;
+import android.content.Context;
+import android.os.Bundle;
+import android.support.v14.preference.SwitchPreference;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.Preference.OnPreferenceChangeListener;
+
+import com.android.internal.annotations.VisibleForTesting;
+import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
+import com.android.settings.applications.AppInfoWithHeader;
+import com.android.settings.applications.AppStateAppOpsBridge.PermissionState;
+import com.android.settings.R;
+import com.android.settings.overlay.FeatureFactory;
+
+import com.android.settings.wifi.AppStateChangeWifiStateBridge.WifiSettingsState;
+import com.android.settingslib.applications.ApplicationsState.AppEntry;
+import com.android.settingslib.applications.ApplicationsState.AppFilter;
+
+import static android.app.AppOpsManager.MODE_ALLOWED;
+import static android.app.AppOpsManager.MODE_IGNORED;
+
+public class ChangeWifiStateDetails extends AppInfoWithHeader
+        implements OnPreferenceChangeListener {
+
+    private static final String KEY_APP_OPS_SETTINGS_SWITCH = "app_ops_settings_switch";
+    private static final String LOG_TAG = "ChangeWifiStateDetails";
+
+    private AppStateChangeWifiStateBridge mAppBridge;
+    private AppOpsManager mAppOpsManager;
+    private SwitchPreference mSwitchPref;
+    private WifiSettingsState mWifiSettingsState;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        final Context context = getActivity();
+        mAppBridge = new AppStateChangeWifiStateBridge(context, mState, null);
+        mAppOpsManager = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
+
+        // find preferences
+        addPreferencesFromResource(R.xml.change_wifi_state_details);
+        mSwitchPref = (SwitchPreference) findPreference(KEY_APP_OPS_SETTINGS_SWITCH);
+
+        // set title/summary for all of them
+        mSwitchPref.setTitle(R.string.change_wifi_state_app_detail_switch);
+
+        // install event listeners
+        mSwitchPref.setOnPreferenceChangeListener(this);
+    }
+
+    @Override
+    protected AlertDialog createDialog(int id, int errorCode) {
+        return null;
+    }
+
+    @Override
+    public int getMetricsCategory() {
+        return MetricsEvent.CONFIGURE_WIFI;
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        if (preference == mSwitchPref) {
+            if (mWifiSettingsState != null && (Boolean) newValue
+                    != mWifiSettingsState.isPermissible()) {
+                setCanChangeWifiState(!mWifiSettingsState.isPermissible());
+                refreshUi();
+            }
+            return true;
+        }
+        return false;
+    }
+
+    private void setCanChangeWifiState(boolean newState) {
+        logSpecialPermissionChange(newState, mPackageName);
+        mAppOpsManager.setMode(AppOpsManager.OP_CHANGE_WIFI_STATE,
+                mPackageInfo.applicationInfo.uid, mPackageName, newState
+                        ? AppOpsManager.MODE_ALLOWED : AppOpsManager.MODE_IGNORED);
+    }
+
+    protected void logSpecialPermissionChange(boolean newState, String packageName) {
+        int logCategory = newState ? MetricsEvent.APP_SPECIAL_PERMISSION_SETTINGS_CHANGE_ALLOW
+                : MetricsEvent.APP_SPECIAL_PERMISSION_SETTINGS_CHANGE_DENY;
+        FeatureFactory.getFactory(getContext()).getMetricsFeatureProvider().action(getContext(),
+                logCategory, packageName);
+    }
+
+    @Override
+    protected boolean refreshUi() {
+        if (mPackageInfo == null || mPackageInfo.applicationInfo == null) {
+            return false;
+        }
+        mWifiSettingsState = mAppBridge.getWifiSettingsInfo(mPackageName,
+                mPackageInfo.applicationInfo.uid);
+
+        boolean canChange = mWifiSettingsState.isPermissible();
+        mSwitchPref.setChecked(canChange);
+        // you can't ask a user for a permission you didn't even declare!
+        mSwitchPref.setEnabled(mWifiSettingsState.permissionDeclared);
+        return true;
+    }
+
+    public static CharSequence getSummary(Context context, AppEntry entry) {
+        WifiSettingsState state;
+        if (entry.extraInfo instanceof WifiSettingsState) {
+            state = (WifiSettingsState) entry.extraInfo;
+        } else if (entry.extraInfo instanceof PermissionState) {
+            state = new WifiSettingsState((PermissionState) entry.extraInfo);
+        } else {
+            state = new AppStateChangeWifiStateBridge(context, null, null).getWifiSettingsInfo(
+                    entry.info.packageName, entry.info.uid);
+        }
+        return getSummary(context, state);
+    }
+
+    public static CharSequence getSummary(Context context, WifiSettingsState wifiSettingsState) {
+        return context.getString(wifiSettingsState.isPermissible()
+                ? R.string.app_permission_summary_allowed
+                : R.string.app_permission_summary_not_allowed);
+    }
+}