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/*
* Copyright (C) 2013 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;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.RestrictionsManager;
import android.os.Bundle;
import android.os.PersistableBundle;
import android.os.UserManager;
/**
* Base class for settings screens that should be pin protected when in restricted mode.
* The constructor for this class will take the restriction key that this screen should be
* locked by. If {@link RestrictionsManager.hasRestrictionsProvider()} and
* {@link UserManager.hasUserRestriction()}, then the user will have to enter the restrictions
* pin before seeing the Settings screen.
*
* If this settings screen should be pin protected whenever
* {@link RestrictionsManager.hasRestrictionsProvider()} returns true, pass in
* {@link RESTRICT_IF_OVERRIDABLE} to the constructor instead of a restrictions key.
*/
public abstract class RestrictedSettingsFragment extends SettingsPreferenceFragment {
protected static final String RESTRICT_IF_OVERRIDABLE = "restrict_if_overridable";
// No RestrictedSettingsFragment screens should use this number in startActivityForResult.
private static final int REQUEST_PIN_CHALLENGE = 12309;
private static final String KEY_CHALLENGE_SUCCEEDED = "chsc";
private static final String KEY_CHALLENGE_REQUESTED = "chrq";
// If the restriction PIN is entered correctly.
private boolean mChallengeSucceeded;
private boolean mChallengeRequested;
private UserManager mUserManager;
private RestrictionsManager mRestrictionsManager;
private final String mRestrictionKey;
// Receiver to clear pin status when the screen is turned off.
private BroadcastReceiver mScreenOffReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (!mChallengeRequested) {
mChallengeSucceeded = false;
mChallengeRequested = false;
}
}
};
/**
* @param restrictionKey The restriction key to check before pin protecting
* this settings page. Pass in {@link RESTRICT_IF_OVERRIDABLE} if it should
* be protected whenever a restrictions provider is set. Pass in
* null if it should never be protected.
*/
public RestrictedSettingsFragment(String restrictionKey) {
mRestrictionKey = restrictionKey;
}
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
mRestrictionsManager = (RestrictionsManager) getSystemService(Context.RESTRICTIONS_SERVICE);
mUserManager = (UserManager) getSystemService(Context.USER_SERVICE);
if (icicle != null) {
mChallengeSucceeded = icicle.getBoolean(KEY_CHALLENGE_SUCCEEDED, false);
mChallengeRequested = icicle.getBoolean(KEY_CHALLENGE_REQUESTED, false);
}
IntentFilter offFilter = new IntentFilter(Intent.ACTION_SCREEN_OFF);
offFilter.addAction(Intent.ACTION_USER_PRESENT);
getActivity().registerReceiver(mScreenOffReceiver, offFilter);
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
if (getActivity().isChangingConfigurations()) {
outState.putBoolean(KEY_CHALLENGE_REQUESTED, mChallengeRequested);
outState.putBoolean(KEY_CHALLENGE_SUCCEEDED, mChallengeSucceeded);
}
}
@Override
public void onResume() {
super.onResume();
if (shouldBeProviderProtected(mRestrictionKey)) {
ensurePin();
}
}
@Override
public void onDestroy() {
getActivity().unregisterReceiver(mScreenOffReceiver);
super.onDestroy();
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_PIN_CHALLENGE) {
if (resultCode == Activity.RESULT_OK) {
mChallengeSucceeded = true;
mChallengeRequested = false;
} else {
mChallengeSucceeded = false;
}
return;
}
super.onActivityResult(requestCode, resultCode, data);
}
private void ensurePin() {
if (!mChallengeSucceeded && !mChallengeRequested
&& mRestrictionsManager.hasRestrictionsProvider()) {
Intent intent = mRestrictionsManager.createLocalApprovalIntent();
if (intent != null) {
mChallengeRequested = true;
mChallengeSucceeded = false;
PersistableBundle request = new PersistableBundle();
request.putString(RestrictionsManager.REQUEST_KEY_MESSAGE,
getResources().getString(R.string.restr_pin_enter_admin_pin));
intent.putExtra(RestrictionsManager.EXTRA_REQUEST_BUNDLE, request);
startActivityForResult(intent, REQUEST_PIN_CHALLENGE);
}
}
}
/**
* Returns true if this activity is restricted, but no restrictions provider has been set.
* Used to determine if the settings UI should disable UI.
*/
protected boolean isRestrictedAndNotProviderProtected() {
if (mRestrictionKey == null || RESTRICT_IF_OVERRIDABLE.equals(mRestrictionKey)) {
return false;
}
return mUserManager.hasUserRestriction(mRestrictionKey)
&& !mRestrictionsManager.hasRestrictionsProvider();
}
protected boolean hasChallengeSucceeded() {
return (mChallengeRequested && mChallengeSucceeded) || !mChallengeRequested;
}
/**
* Returns true if this restrictions key is locked down.
*/
protected boolean shouldBeProviderProtected(String restrictionKey) {
if (restrictionKey == null) {
return false;
}
boolean restricted = RESTRICT_IF_OVERRIDABLE.equals(restrictionKey)
|| mUserManager.hasUserRestriction(mRestrictionKey);
return restricted && mRestrictionsManager.hasRestrictionsProvider();
}
/**
* Returns whether restricted or actionable UI elements should be removed or disabled.
*/
protected boolean isUiRestricted() {
return isRestrictedAndNotProviderProtected() || !hasChallengeSucceeded();
}
}
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