src/com/android/phone/CarrierConfigLoader.java

/*
 * Copyright (c) 2015, 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.phone;

import static android.service.carrier.CarrierService.ICarrierServiceWrapper.KEY_CONFIG_BUNDLE;
import static android.service.carrier.CarrierService.ICarrierServiceWrapper.RESULT_ERROR;

import android.annotation.NonNull;
import android.annotation.Nullable;
import android.app.AppOpsManager;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.ServiceConnection;
import android.content.SharedPreferences;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Binder;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.PersistableBundle;
import android.os.Process;
import android.os.RemoteException;
import android.os.ResultReceiver;
import android.os.UserHandle;
import android.preference.PreferenceManager;
import android.service.carrier.CarrierIdentifier;
import android.service.carrier.CarrierService;
import android.service.carrier.ICarrierService;
import android.telephony.CarrierConfigManager;
import android.telephony.SubscriptionManager;
import android.telephony.TelephonyFrameworkInitializer;
import android.telephony.TelephonyManager;
import android.text.TextUtils;
import android.util.ArraySet;
import android.util.LocalLog;
import android.util.Log;

import com.android.internal.telephony.ICarrierConfigLoader;
import com.android.internal.telephony.IccCardConstants;
import com.android.internal.telephony.Phone;
import com.android.internal.telephony.PhoneFactory;
import com.android.internal.telephony.SubscriptionInfoUpdater;
import com.android.internal.telephony.TelephonyPermissions;
import com.android.internal.telephony.util.ArrayUtils;
import com.android.internal.util.IndentingPrintWriter;

import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Set;

/**
 * CarrierConfigLoader binds to privileged carrier apps to fetch carrier config overlays.
 */
public class CarrierConfigLoader extends ICarrierConfigLoader.Stub {
    private static final String LOG_TAG = "CarrierConfigLoader";

    // Package name for platform carrier config app, bundled with system image.
    private final String mPlatformCarrierConfigPackage;

    /** The singleton instance. */
    private static CarrierConfigLoader sInstance;
    // The context for phone app, passed from PhoneGlobals.
    private Context mContext;
    // Carrier configs from default app, indexed by phoneID.
    private PersistableBundle[] mConfigFromDefaultApp;
    // Carrier configs from privileged carrier config app, indexed by phoneID.
    private PersistableBundle[] mConfigFromCarrierApp;
    // Persistent Carrier configs that are provided via the override test API, indexed by phone ID.
    private PersistableBundle[] mPersistentOverrideConfigs;
    // Carrier configs that are provided via the override test API, indexed by phone ID.
    private PersistableBundle[] mOverrideConfigs;
    // Carrier configs to override code default when there is no SIM inserted
    private PersistableBundle mNoSimConfig;
    // Service connection for binding to config app.
    private CarrierServiceConnection[] mServiceConnection;
    // Service connection for binding to carrier config app for no SIM config.
    private CarrierServiceConnection[] mServiceConnectionForNoSimConfig;
    // Whether we are bound to a service for each phone
    private boolean[] mServiceBound;
    // Whether we are bound to a service for no SIM config
    private boolean[] mServiceBoundForNoSimConfig;
    // Whether we have sent config change broadcast for each phone id.
    private boolean[] mHasSentConfigChange;
    // Whether the broadcast was sent from EVENT_SYSTEM_UNLOCKED, to track rebroadcasts
    private boolean[] mFromSystemUnlocked;
    // SubscriptionInfoUpdater
    private final SubscriptionInfoUpdater mSubscriptionInfoUpdater;

    // Broadcast receiver for Boot intents, register intent filter in construtor.
    private final BroadcastReceiver mBootReceiver = new ConfigLoaderBroadcastReceiver();
    // Broadcast receiver for SIM and pkg intents, register intent filter in constructor.
    private final BroadcastReceiver mPackageReceiver = new ConfigLoaderBroadcastReceiver();
    private final LocalLog mCarrierConfigLoadingLog = new LocalLog(100);


    // Message codes; see mHandler below.
    // Request from SubscriptionInfoUpdater when SIM becomes absent or error.
    private static final int EVENT_CLEAR_CONFIG = 0;
    // Has connected to default app.
    private static final int EVENT_CONNECTED_TO_DEFAULT = 3;
    // Has connected to carrier app.
    private static final int EVENT_CONNECTED_TO_CARRIER = 4;
    // Config has been loaded from default app (or cache).
    private static final int EVENT_FETCH_DEFAULT_DONE = 5;
    // Config has been loaded from carrier app (or cache).
    private static final int EVENT_FETCH_CARRIER_DONE = 6;
    // Attempt to fetch from default app or read from XML.
    private static final int EVENT_DO_FETCH_DEFAULT = 7;
    // Attempt to fetch from carrier app or read from XML.
    private static final int EVENT_DO_FETCH_CARRIER = 8;
    // A package has been installed, uninstalled, or updated.
    private static final int EVENT_PACKAGE_CHANGED = 9;
    // Bind timed out for the default app.
    private static final int EVENT_BIND_DEFAULT_TIMEOUT = 10;
    // Bind timed out for a carrier app.
    private static final int EVENT_BIND_CARRIER_TIMEOUT = 11;
    // Check if the system fingerprint has changed.
    private static final int EVENT_CHECK_SYSTEM_UPDATE = 12;
    // Rerun carrier config binding after system is unlocked.
    private static final int EVENT_SYSTEM_UNLOCKED = 13;
    // Fetching config timed out from the default app.
    private static final int EVENT_FETCH_DEFAULT_TIMEOUT = 14;
    // Fetching config timed out from a carrier app.
    private static final int EVENT_FETCH_CARRIER_TIMEOUT = 15;
    // SubscriptionInfoUpdater has finished updating the sub for the carrier config.
    private static final int EVENT_SUBSCRIPTION_INFO_UPDATED = 16;
    // Multi-SIM config changed.
    private static final int EVENT_MULTI_SIM_CONFIG_CHANGED = 17;
    // Attempt to fetch from default app or read from XML for no SIM case.
    private static final int EVENT_DO_FETCH_DEFAULT_FOR_NO_SIM_CONFIG = 18;
    // No SIM config has been loaded from default app (or cache).
    private static final int EVENT_FETCH_DEFAULT_FOR_NO_SIM_CONFIG_DONE = 19;
    // Has connected to default app for no SIM config.
    private static final int EVENT_CONNECTED_TO_DEFAULT_FOR_NO_SIM_CONFIG = 20;
    // Bind timed out for the default app when trying to fetch no SIM config.
    private static final int EVENT_BIND_DEFAULT_FOR_NO_SIM_CONFIG_TIMEOUT = 21;
    // Fetching config timed out from the default app for no SIM config.
    private static final int EVENT_FETCH_DEFAULT_FOR_NO_SIM_CONFIG_TIMEOUT = 22;

    private static final int BIND_TIMEOUT_MILLIS = 30000;

    // Keys used for saving and restoring config bundle from file.
    private static final String KEY_VERSION = "__carrier_config_package_version__";

    private static final String OVERRIDE_PACKAGE_ADDITION = "-override";

    // SharedPreferences key for last known build fingerprint.
    private static final String KEY_FINGERPRINT = "build_fingerprint";

    // Argument for #dump that indicates we should also call the default and specified carrier
    // service's #dump method. In multi-SIM devices, it's possible that carrier A is on SIM 1 and
    // carrier B is on SIM 2, in which case we should not dump carrier B's service when carrier A
    // requested the dump.
    private static final String DUMP_ARG_REQUESTING_PACKAGE = "--requesting-package";

    // Handler to process various events.
    //
    // For each phoneId, the event sequence should be:
    //     fetch default, connected to default, fetch default (async), fetch default done,
    //     fetch carrier, connected to carrier, fetch carrier (async), fetch carrier done.
    //
    // If there is a saved config file for either the default app or the carrier app, we skip
    // binding to the app and go straight from fetch to loaded.
    //
    // At any time, at most one connection is active. If events are not in this order, previous
    // connection will be unbound, so only latest event takes effect.
    //
    // We broadcast ACTION_CARRIER_CONFIG_CHANGED after:
    // 1. loading from carrier app (even if read from a file)
    // 2. loading from default app if there is no carrier app (even if read from a file)
    // 3. clearing config (e.g. due to sim removal)
    // 4. encountering bind or IPC error
    private class ConfigHandler extends Handler {
        @Override
        public void handleMessage(Message msg) {
            final int phoneId = msg.arg1;
            logdWithLocalLog("mHandler: " + msg.what + " phoneId: " + phoneId);
            if (!SubscriptionManager.isValidPhoneId(phoneId)
                    && msg.what != EVENT_MULTI_SIM_CONFIG_CHANGED) {
                return;
            }
            switch (msg.what) {
                case EVENT_CLEAR_CONFIG: {
                    clearConfigForPhone(phoneId, true);
                    break;
                }

                case EVENT_SYSTEM_UNLOCKED: {
                    for (int i = 0; i < TelephonyManager.from(mContext).getActiveModemCount();
                            ++i) {
                        // When the user unlocks the device, send the broadcast again (with a
                        // rebroadcast extra) if we have sent it before unlock. This will avoid
                        // trying to load the carrier config when the SIM is still loading when the
                        // unlock happens.
                        if (mHasSentConfigChange[i]) {
                            logdWithLocalLog("System unlocked");
                            mFromSystemUnlocked[i] = true;
                            updateConfigForPhoneId(i);
                        }
                    }
                    break;
                }

                case EVENT_PACKAGE_CHANGED: {
                    final String carrierPackageName = (String) msg.obj;
                    // Only update if there are cached config removed to avoid updating config for
                    // unrelated packages.
                    if (clearCachedConfigForPackage(carrierPackageName)) {
                        int numPhones = TelephonyManager.from(mContext).getActiveModemCount();
                        for (int i = 0; i < numPhones; ++i) {
                            logdWithLocalLog("Package changed: " + carrierPackageName
                                    + ", phone=" + i);
                            updateConfigForPhoneId(i);
                        }
                    }
                    break;
                }

                case EVENT_DO_FETCH_DEFAULT: {
                    // Clear in-memory cache for carrier app config, so when carrier app gets
                    // uninstalled, no stale config is left.
                    if (mConfigFromCarrierApp[phoneId] != null
                            && getCarrierPackageForPhoneId(phoneId) == null) {
                        mConfigFromCarrierApp[phoneId] = null;
                    }
                    // Restore persistent override values.
                    PersistableBundle config = restoreConfigFromXml(
                            mPlatformCarrierConfigPackage, OVERRIDE_PACKAGE_ADDITION, phoneId);
                    if (config != null) {
                        logd("Loaded persistent override config from XML. package="
                                + mPlatformCarrierConfigPackage
                                + " phoneId=" + phoneId);
                        mPersistentOverrideConfigs[phoneId] = config;
                    }

                    config = restoreConfigFromXml(mPlatformCarrierConfigPackage, "", phoneId);
                    if (config != null) {
                        logd(
                                "Loaded config from XML. package="
                                        + mPlatformCarrierConfigPackage
                                        + " phoneId="
                                        + phoneId);
                        mConfigFromDefaultApp[phoneId] = config;
                        Message newMsg = obtainMessage(EVENT_FETCH_DEFAULT_DONE, phoneId, -1);
                        newMsg.getData().putBoolean("loaded_from_xml", true);
                        mHandler.sendMessage(newMsg);
                    } else {
                        // No cached config, so fetch it from the default app.
                        if (bindToConfigPackage(
                                mPlatformCarrierConfigPackage,
                                phoneId,
                                EVENT_CONNECTED_TO_DEFAULT)) {
                            sendMessageDelayed(
                                    obtainMessage(EVENT_BIND_DEFAULT_TIMEOUT, phoneId, -1),
                                    BIND_TIMEOUT_MILLIS);
                        } else {
                            // Put a stub bundle in place so that the rest of the logic continues
                            // smoothly.
                            mConfigFromDefaultApp[phoneId] = new PersistableBundle();
                            // Send broadcast if bind fails.
                            notifySubscriptionInfoUpdater(phoneId);
                            // TODO: We *must* call unbindService even if bindService returns false.
                            // (And possibly if SecurityException was thrown.)
                            loge("binding to default app: "
                                    + mPlatformCarrierConfigPackage + " fails");
                        }
                    }
                    break;
                }

                case EVENT_CONNECTED_TO_DEFAULT: {
                    removeMessages(EVENT_BIND_DEFAULT_TIMEOUT);
                    final CarrierServiceConnection conn = (CarrierServiceConnection) msg.obj;
                    // If new service connection has been created, unbind.
                    if (mServiceConnection[phoneId] != conn || conn.service == null) {
                        unbindIfBound(mContext, conn, phoneId);
                        break;
                    }
                    final CarrierIdentifier carrierId = getCarrierIdentifierForPhoneId(phoneId);
                    // ResultReceiver callback will execute in this Handler's thread.
                    final ResultReceiver resultReceiver =
                            new ResultReceiver(this) {
                                @Override
                                public void onReceiveResult(int resultCode, Bundle resultData) {
                                    unbindIfBound(mContext, conn, phoneId);
                                    // If new service connection has been created, this is stale.
                                    if (mServiceConnection[phoneId] != conn) {
                                        loge("Received response for stale request.");
                                        return;
                                    }
                                    removeMessages(EVENT_FETCH_DEFAULT_TIMEOUT);
                                    if (resultCode == RESULT_ERROR || resultData == null) {
                                        // On error, abort config fetching.
                                        loge("Failed to get carrier config");
                                        notifySubscriptionInfoUpdater(phoneId);
                                        return;
                                    }
                                    PersistableBundle config =
                                            resultData.getParcelable(KEY_CONFIG_BUNDLE);
                                    saveConfigToXml(mPlatformCarrierConfigPackage, "", phoneId,
                                            carrierId, config);
                                    mConfigFromDefaultApp[phoneId] = config;
                                    sendMessage(
                                            obtainMessage(
                                                    EVENT_FETCH_DEFAULT_DONE, phoneId, -1));
                                }
                            };
                    // Now fetch the config asynchronously from the ICarrierService.
                    try {
                        ICarrierService carrierService =
                                ICarrierService.Stub.asInterface(conn.service);
                        carrierService.getCarrierConfig(carrierId, resultReceiver);
                        logdWithLocalLog("Fetch config for default app: "
                                + mPlatformCarrierConfigPackage
                                + " carrierid: " + carrierId.toString());
                    } catch (RemoteException e) {
                        loge("Failed to get carrier config from default app: " +
                                mPlatformCarrierConfigPackage + " err: " + e.toString());
                        unbindIfBound(mContext, conn, phoneId);
                        break; // So we don't set a timeout.
                    }
                    sendMessageDelayed(
                            obtainMessage(EVENT_FETCH_DEFAULT_TIMEOUT, phoneId, -1),
                            BIND_TIMEOUT_MILLIS);
                    break;
                }

                case EVENT_BIND_DEFAULT_TIMEOUT:
                case EVENT_FETCH_DEFAULT_TIMEOUT: {
                    loge("Bind/fetch time out from " + mPlatformCarrierConfigPackage);
                    removeMessages(EVENT_FETCH_DEFAULT_TIMEOUT);
                    // If we attempted to bind to the app, but the service connection is null due to
                    // the race condition that clear config event happens before bind/fetch complete
                    // then config was cleared while we were waiting and we should not continue.
                    if (mServiceConnection[phoneId] != null) {
                        // If a ResponseReceiver callback is in the queue when this happens, we will
                        // unbind twice and throw an exception.
                        unbindIfBound(mContext, mServiceConnection[phoneId], phoneId);
                        broadcastConfigChangedIntent(phoneId);
                    }
                    // Put a stub bundle in place so that the rest of the logic continues smoothly.
                    mConfigFromDefaultApp[phoneId] = new PersistableBundle();
                    notifySubscriptionInfoUpdater(phoneId);
                    break;
                }

                case EVENT_FETCH_DEFAULT_DONE: {
                    // If we attempted to bind to the app, but the service connection is null, then
                    // config was cleared while we were waiting and we should not continue.
                    if (!msg.getData().getBoolean("loaded_from_xml", false)
                            && mServiceConnection[phoneId] == null) {
                        break;
                    }
                    final String carrierPackageName = getCarrierPackageForPhoneId(phoneId);
                    if (carrierPackageName != null) {
                        logd("Found carrier config app: " + carrierPackageName);
                        sendMessage(obtainMessage(EVENT_DO_FETCH_CARRIER, phoneId, -1));
                    } else {
                        notifySubscriptionInfoUpdater(phoneId);
                    }
                    break;
                }

                case EVENT_DO_FETCH_CARRIER: {
                    final String carrierPackageName = getCarrierPackageForPhoneId(phoneId);
                    final PersistableBundle config =
                            restoreConfigFromXml(carrierPackageName, "", phoneId);
                    if (config != null) {
                        logd(
                                "Loaded config from XML. package="
                                        + carrierPackageName
                                        + " phoneId="
                                        + phoneId);
                        mConfigFromCarrierApp[phoneId] = config;
                        Message newMsg = obtainMessage(EVENT_FETCH_CARRIER_DONE, phoneId, -1);
                        newMsg.getData().putBoolean("loaded_from_xml", true);
                        sendMessage(newMsg);
                    } else {
                        // No cached config, so fetch it from a carrier app.
                        if (carrierPackageName != null && bindToConfigPackage(carrierPackageName,
                                phoneId, EVENT_CONNECTED_TO_CARRIER)) {
                            sendMessageDelayed(
                                    obtainMessage(EVENT_BIND_CARRIER_TIMEOUT, phoneId, -1),
                                    BIND_TIMEOUT_MILLIS);
                        } else {
                            // Put a stub bundle in place so that the rest of the logic continues
                            // smoothly.
                            mConfigFromCarrierApp[phoneId] = new PersistableBundle();
                            // Send broadcast if bind fails.
                            broadcastConfigChangedIntent(phoneId);
                            loge("Bind to carrier app: " + carrierPackageName + " fails");
                            notifySubscriptionInfoUpdater(phoneId);
                        }
                    }
                    break;
                }

                case EVENT_CONNECTED_TO_CARRIER: {
                    removeMessages(EVENT_BIND_CARRIER_TIMEOUT);
                    final CarrierServiceConnection conn = (CarrierServiceConnection) msg.obj;
                    // If new service connection has been created, unbind.
                    if (mServiceConnection[phoneId] != conn || conn.service == null) {
                        unbindIfBound(mContext, conn, phoneId);
                        break;
                    }
                    final CarrierIdentifier carrierId = getCarrierIdentifierForPhoneId(phoneId);
                    // ResultReceiver callback will execute in this Handler's thread.
                    final ResultReceiver resultReceiver =
                            new ResultReceiver(this) {
                                @Override
                                public void onReceiveResult(int resultCode, Bundle resultData) {
                                    unbindIfBound(mContext, conn, phoneId);
                                    // If new service connection has been created, this is stale.
                                    if (mServiceConnection[phoneId] != conn) {
                                        loge("Received response for stale request.");
                                        return;
                                    }
                                    removeMessages(EVENT_FETCH_CARRIER_TIMEOUT);
                                    if (resultCode == RESULT_ERROR || resultData == null) {
                                        // On error, abort config fetching.
                                        loge("Failed to get carrier config from carrier app: "
                                                + getCarrierPackageForPhoneId(phoneId));
                                        broadcastConfigChangedIntent(phoneId);
                                        notifySubscriptionInfoUpdater(phoneId);
                                        return;
                                    }
                                    PersistableBundle config =
                                            resultData.getParcelable(KEY_CONFIG_BUNDLE);
                                    saveConfigToXml(getCarrierPackageForPhoneId(phoneId), "",
                                            phoneId, carrierId, config);
                                    mConfigFromCarrierApp[phoneId] = config;
                                    sendMessage(
                                            obtainMessage(
                                                    EVENT_FETCH_CARRIER_DONE, phoneId, -1));
                                }
                            };
                    // Now fetch the config asynchronously from the ICarrierService.
                    try {
                        ICarrierService carrierService =
                                ICarrierService.Stub.asInterface(conn.service);
                        carrierService.getCarrierConfig(carrierId, resultReceiver);
                        logdWithLocalLog("Fetch config for carrier app: "
                                + getCarrierPackageForPhoneId(phoneId)
                                + " carrierid: " + carrierId.toString());
                    } catch (RemoteException e) {
                        loge("Failed to get carrier config: " + e.toString());
                        unbindIfBound(mContext, conn, phoneId);
                        break; // So we don't set a timeout.
                    }
                    sendMessageDelayed(
                            obtainMessage(EVENT_FETCH_CARRIER_TIMEOUT, phoneId, -1),
                            BIND_TIMEOUT_MILLIS);
                    break;
                }

                case EVENT_BIND_CARRIER_TIMEOUT:
                case EVENT_FETCH_CARRIER_TIMEOUT: {
                    loge("Bind/fetch from carrier app timeout, package="
                            + getCarrierPackageForPhoneId(phoneId));
                    removeMessages(EVENT_FETCH_CARRIER_TIMEOUT);
                    // If we attempted to bind to the app, but the service connection is null due to
                    // the race condition that clear config event happens before bind/fetch complete
                    // then config was cleared while we were waiting and we should not continue.
                    if (mServiceConnection[phoneId] != null) {
                        // If a ResponseReceiver callback is in the queue when this happens, we will
                        // unbind twice and throw an exception.
                        unbindIfBound(mContext, mServiceConnection[phoneId], phoneId);
                        broadcastConfigChangedIntent(phoneId);
                    }
                    // Put a stub bundle in place so that the rest of the logic continues smoothly.
                    mConfigFromCarrierApp[phoneId] = new PersistableBundle();
                    notifySubscriptionInfoUpdater(phoneId);
                    break;
                }
                case EVENT_FETCH_CARRIER_DONE: {
                    // If we attempted to bind to the app, but the service connection is null, then
                    // config was cleared while we were waiting and we should not continue.
                    if (!msg.getData().getBoolean("loaded_from_xml", false)
                            && mServiceConnection[phoneId] == null) {
                        break;
                    }
                    notifySubscriptionInfoUpdater(phoneId);
                    break;
                }

                case EVENT_CHECK_SYSTEM_UPDATE: {
                    SharedPreferences sharedPrefs =
                            PreferenceManager.getDefaultSharedPreferences(mContext);
                    final String lastFingerprint = sharedPrefs.getString(KEY_FINGERPRINT, null);
                    if (!Build.FINGERPRINT.equals(lastFingerprint)) {
                        logd(
                                "Build fingerprint changed. old: "
                                        + lastFingerprint
                                        + " new: "
                                        + Build.FINGERPRINT);
                        clearCachedConfigForPackage(null);
                        sharedPrefs
                                .edit()
                                .putString(KEY_FINGERPRINT, Build.FINGERPRINT)
                                .apply();
                    }
                    break;
                }

                case EVENT_SUBSCRIPTION_INFO_UPDATED:
                    broadcastConfigChangedIntent(phoneId);
                    break;
                case EVENT_MULTI_SIM_CONFIG_CHANGED:
                    onMultiSimConfigChanged();
                    break;

                case EVENT_DO_FETCH_DEFAULT_FOR_NO_SIM_CONFIG: {
                    PersistableBundle config =
                            restoreNoSimConfigFromXml(mPlatformCarrierConfigPackage);

                    if (config != null) {
                        logd("Loaded no SIM config from XML. package="
                                + mPlatformCarrierConfigPackage);
                        mNoSimConfig = config;
                        sendMessage(
                                obtainMessage(
                                        EVENT_FETCH_DEFAULT_FOR_NO_SIM_CONFIG_DONE,
                                            phoneId, -1));
                    } else {
                        // No cached config, so fetch it from the default app.
                        if (bindToConfigPackage(
                                mPlatformCarrierConfigPackage,
                                phoneId,
                                EVENT_CONNECTED_TO_DEFAULT_FOR_NO_SIM_CONFIG)) {
                            sendMessageDelayed(
                                    obtainMessage(
                                            EVENT_BIND_DEFAULT_FOR_NO_SIM_CONFIG_TIMEOUT,
                                                phoneId, -1), BIND_TIMEOUT_MILLIS);
                        } else {
                            broadcastConfigChangedIntent(phoneId, false);
                            // TODO: We *must* call unbindService even if bindService returns false.
                            // (And possibly if SecurityException was thrown.)
                            loge("binding to default app to fetch no SIM config: "
                                    + mPlatformCarrierConfigPackage + " fails");
                        }
                    }
                    break;
                }

                case EVENT_FETCH_DEFAULT_FOR_NO_SIM_CONFIG_DONE: {
                    broadcastConfigChangedIntent(phoneId, false);
                    break;
                }

                case EVENT_BIND_DEFAULT_FOR_NO_SIM_CONFIG_TIMEOUT:
                case EVENT_FETCH_DEFAULT_FOR_NO_SIM_CONFIG_TIMEOUT: {
                    loge("Bind/fetch time out for no SIM config from "
                            + mPlatformCarrierConfigPackage);
                    removeMessages(EVENT_FETCH_DEFAULT_FOR_NO_SIM_CONFIG_TIMEOUT);
                    // If we attempted to bind to the app, but the service connection is null due to
                    // the race condition that clear config event happens before bind/fetch complete
                    // then config was cleared while we were waiting and we should not continue.
                    if (mServiceConnectionForNoSimConfig[phoneId] != null) {
                        // If a ResponseReceiver callback is in the queue when this happens, we will
                        // unbind twice and throw an exception.
                        unbindIfBoundForNoSimConfig(mContext,
                                mServiceConnectionForNoSimConfig[phoneId], phoneId);
                    }
                    broadcastConfigChangedIntent(phoneId, false);
                    break;
                }

                case EVENT_CONNECTED_TO_DEFAULT_FOR_NO_SIM_CONFIG: {
                    removeMessages(EVENT_BIND_DEFAULT_FOR_NO_SIM_CONFIG_TIMEOUT);
                    final CarrierServiceConnection conn = (CarrierServiceConnection) msg.obj;
                    // If new service connection has been created, unbind.
                    if (mServiceConnectionForNoSimConfig[phoneId] != conn || conn.service == null) {
                        unbindIfBoundForNoSimConfig(mContext, conn, phoneId);
                        break;
                    }

                    // ResultReceiver callback will execute in this Handler's thread.
                    final ResultReceiver resultReceiver =
                            new ResultReceiver(this) {
                                @Override
                                public void onReceiveResult(int resultCode, Bundle resultData) {
                                    unbindIfBoundForNoSimConfig(mContext, conn, phoneId);
                                    // If new service connection has been created, this is stale.
                                    if (mServiceConnectionForNoSimConfig[phoneId] != conn) {
                                        loge("Received response for stale request.");
                                        return;
                                    }
                                    removeMessages(EVENT_FETCH_DEFAULT_FOR_NO_SIM_CONFIG_TIMEOUT);
                                    if (resultCode == RESULT_ERROR || resultData == null) {
                                        // On error, abort config fetching.
                                        loge("Failed to get no SIM carrier config");
                                        return;
                                    }
                                    PersistableBundle config =
                                            resultData.getParcelable(KEY_CONFIG_BUNDLE);
                                    saveNoSimConfigToXml(mPlatformCarrierConfigPackage, config);
                                    mNoSimConfig = config;
                                    sendMessage(
                                            obtainMessage(
                                                    EVENT_FETCH_DEFAULT_FOR_NO_SIM_CONFIG_DONE,
                                                        phoneId, -1));
                                }
                            };
                    // Now fetch the config asynchronously from the ICarrierService.
                    try {
                        ICarrierService carrierService =
                                ICarrierService.Stub.asInterface(conn.service);
                        carrierService.getCarrierConfig(null, resultReceiver);
                        logdWithLocalLog("Fetch no sim config from default app: "
                                + mPlatformCarrierConfigPackage);
                    } catch (RemoteException e) {
                        loge("Failed to get no sim carrier config from default app: " +
                                mPlatformCarrierConfigPackage + " err: " + e.toString());
                        unbindIfBoundForNoSimConfig(mContext, conn, phoneId);
                        break; // So we don't set a timeout.
                    }
                    sendMessageDelayed(
                            obtainMessage(
                                    EVENT_FETCH_DEFAULT_FOR_NO_SIM_CONFIG_TIMEOUT,
                                        phoneId, -1), BIND_TIMEOUT_MILLIS);
                    break;
                }
            }
        }
    }

    private final Handler mHandler;

    /**
     * Constructs a CarrierConfigLoader, registers it as a service, and registers a broadcast
     * receiver for relevant events.
     */
    private CarrierConfigLoader(Context context) {
        mContext = context;
        mPlatformCarrierConfigPackage =
                mContext.getString(R.string.platform_carrier_config_package);
        mHandler = new ConfigHandler();

        IntentFilter bootFilter = new IntentFilter();
        bootFilter.addAction(Intent.ACTION_BOOT_COMPLETED);
        context.registerReceiver(mBootReceiver, bootFilter);

        // Register for package updates. Update app or uninstall app update will have all 3 intents,
        // in the order or removed, added, replaced, all with extra_replace set to true.
        IntentFilter pkgFilter = new IntentFilter();
        pkgFilter.addAction(Intent.ACTION_PACKAGE_ADDED);
        pkgFilter.addAction(Intent.ACTION_PACKAGE_REMOVED);
        pkgFilter.addAction(Intent.ACTION_PACKAGE_REPLACED);
        pkgFilter.addDataScheme("package");
        context.registerReceiver(mPackageReceiver, pkgFilter);

        int numPhones = TelephonyManager.from(context).getSupportedModemCount();
        mConfigFromDefaultApp = new PersistableBundle[numPhones];
        mConfigFromCarrierApp = new PersistableBundle[numPhones];
        mPersistentOverrideConfigs = new PersistableBundle[numPhones];
        mOverrideConfigs = new PersistableBundle[numPhones];
        mNoSimConfig = new PersistableBundle();
        mServiceConnection = new CarrierServiceConnection[numPhones];
        mServiceBound = new boolean[numPhones];
        mHasSentConfigChange = new boolean[numPhones];
        mFromSystemUnlocked = new boolean[numPhones];
        mServiceConnectionForNoSimConfig = new CarrierServiceConnection[numPhones];
        mServiceBoundForNoSimConfig = new boolean[numPhones];
        // Make this service available through ServiceManager.
        TelephonyFrameworkInitializer
                .getTelephonyServiceManager().getCarrierConfigServiceRegisterer().register(this);
        logd("CarrierConfigLoader has started");
        mSubscriptionInfoUpdater = PhoneFactory.getSubscriptionInfoUpdater();
        mHandler.sendEmptyMessage(EVENT_CHECK_SYSTEM_UPDATE);
    }

    /**
     * Initialize the singleton CarrierConfigLoader instance.
     *
     * This is only done once, at startup, from {@link com.android.phone.PhoneApp#onCreate}.
     */
    /* package */
    static CarrierConfigLoader init(Context context) {
        synchronized (CarrierConfigLoader.class) {
            if (sInstance == null) {
                sInstance = new CarrierConfigLoader(context);
            } else {
                Log.wtf(LOG_TAG, "init() called multiple times!  sInstance = " + sInstance);
            }
            return sInstance;
        }
    }

    private void clearConfigForPhone(int phoneId, boolean fetchNoSimConfig) {
        /* Ignore clear configuration request if device is being shutdown. */
        Phone phone = PhoneFactory.getPhone(phoneId);
        if (phone != null) {
            if (phone.isShuttingDown()) {
                return;
            }
        }

        mConfigFromDefaultApp[phoneId] = null;
        mConfigFromCarrierApp[phoneId] = null;
        mServiceConnection[phoneId] = null;
        mHasSentConfigChange[phoneId] = false;

        if (fetchNoSimConfig) {
            // To fetch no SIM config
            mHandler.sendMessage(
                    mHandler.obtainMessage(
                            EVENT_DO_FETCH_DEFAULT_FOR_NO_SIM_CONFIG, phoneId, -1));
        }
    }

    private void notifySubscriptionInfoUpdater(int phoneId) {
        String configPackagename;
        PersistableBundle configToSend;
        int carrierId = getSpecificCarrierIdForPhoneId(phoneId);
        // Prefer the carrier privileged carrier app, but if there is not one, use the platform
        // default carrier app.
        if (mConfigFromCarrierApp[phoneId] != null) {
            configPackagename = getCarrierPackageForPhoneId(phoneId);
            configToSend = mConfigFromCarrierApp[phoneId];
        } else {
            configPackagename = mPlatformCarrierConfigPackage;
            configToSend = mConfigFromDefaultApp[phoneId];
        }

        if (configToSend == null) {
            configToSend = new PersistableBundle();
        }

        // mOverrideConfigs is for testing. And it will override current configs.
        PersistableBundle config = mOverrideConfigs[phoneId];
        if (config != null) {
            configToSend = new PersistableBundle(configToSend);
            configToSend.putAll(config);
        }

        mSubscriptionInfoUpdater.updateSubscriptionByCarrierConfigAndNotifyComplete(
                phoneId, configPackagename, configToSend,
                mHandler.obtainMessage(EVENT_SUBSCRIPTION_INFO_UPDATED, phoneId, -1));
    }

    private void broadcastConfigChangedIntent(int phoneId) {
        broadcastConfigChangedIntent(phoneId, true);
    }

    private void broadcastConfigChangedIntent(int phoneId, boolean addSubIdExtra) {
        Intent intent = new Intent(CarrierConfigManager.ACTION_CARRIER_CONFIG_CHANGED);
        intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT |
                Intent.FLAG_RECEIVER_FOREGROUND);
        if (addSubIdExtra) {
            int simApplicationState = TelephonyManager.SIM_STATE_UNKNOWN;
            int[] subIds = SubscriptionManager.getSubId(phoneId);
            if (!ArrayUtils.isEmpty(subIds)) {
                TelephonyManager telMgr = TelephonyManager.from(mContext)
                        .createForSubscriptionId(subIds[0]);
                simApplicationState = telMgr.getSimApplicationState();
            }
            logd("Broadcast CARRIER_CONFIG_CHANGED for phone " + phoneId
                    + " simApplicationState " + simApplicationState);
            // Include subId/carrier id extra only if SIM records are loaded
            if (simApplicationState != TelephonyManager.SIM_STATE_UNKNOWN
                    && simApplicationState != TelephonyManager.SIM_STATE_NOT_READY) {
                SubscriptionManager.putPhoneIdAndSubIdExtra(intent, phoneId);
                intent.putExtra(TelephonyManager.EXTRA_SPECIFIC_CARRIER_ID,
                        getSpecificCarrierIdForPhoneId(phoneId));
                intent.putExtra(TelephonyManager.EXTRA_CARRIER_ID, getCarrierIdForPhoneId(phoneId));
            }
        }
        intent.putExtra(CarrierConfigManager.EXTRA_SLOT_INDEX, phoneId);
        intent.putExtra(CarrierConfigManager.EXTRA_REBROADCAST_ON_UNLOCK,
                mFromSystemUnlocked[phoneId]);
        mContext.sendBroadcastAsUser(intent, UserHandle.ALL);
        int[] subIds = SubscriptionManager.getSubId(phoneId);
        if (subIds != null && subIds.length > 0) {
            logd("Broadcast CARRIER_CONFIG_CHANGED for phone " + phoneId + ", subId=" + subIds[0]);
        } else {
            logd("Broadcast CARRIER_CONFIG_CHANGED for phone " + phoneId);
        }
        mHasSentConfigChange[phoneId] = true;
        mFromSystemUnlocked[phoneId] = false;
    }

    /** Binds to the default or carrier config app. */
    private boolean bindToConfigPackage(String pkgName, int phoneId, int eventId) {
        logdWithLocalLog("Binding to " + pkgName + " for phone " + phoneId);
        Intent carrierService = new Intent(CarrierService.CARRIER_SERVICE_INTERFACE);
        carrierService.setPackage(pkgName);
        CarrierServiceConnection serviceConnection =  new CarrierServiceConnection(
                phoneId, pkgName, eventId);
        if (eventId == EVENT_CONNECTED_TO_DEFAULT_FOR_NO_SIM_CONFIG) {
            mServiceConnectionForNoSimConfig[phoneId] = serviceConnection;
        } else {
            mServiceConnection[phoneId] = serviceConnection;
        }
        try {
            if (mContext.bindService(carrierService, serviceConnection,
                    Context.BIND_AUTO_CREATE)) {
                if (eventId == EVENT_CONNECTED_TO_DEFAULT_FOR_NO_SIM_CONFIG) {
                    mServiceBoundForNoSimConfig[phoneId] = true;
                } else {
                    mServiceBound[phoneId] = true;
                }
                return true;
            } else {
                return false;
            }
        } catch (SecurityException ex) {
            return false;
        }
    }

    private CarrierIdentifier getCarrierIdentifierForPhoneId(int phoneId) {
        String mcc = "";
        String mnc = "";
        String imsi = "";
        String gid1 = "";
        String gid2 = "";
        String spn = TelephonyManager.from(mContext).getSimOperatorNameForPhone(phoneId);
        String simOperator = TelephonyManager.from(mContext).getSimOperatorNumericForPhone(phoneId);
        int carrierId = TelephonyManager.UNKNOWN_CARRIER_ID;
        int specificCarrierId = TelephonyManager.UNKNOWN_CARRIER_ID;
        // A valid simOperator should be 5 or 6 digits, depending on the length of the MNC.
        if (simOperator != null && simOperator.length() >= 3) {
            mcc = simOperator.substring(0, 3);
            mnc = simOperator.substring(3);
        }
        Phone phone = PhoneFactory.getPhone(phoneId);
        if (phone != null) {
            imsi = phone.getSubscriberId();
            gid1 = phone.getGroupIdLevel1();
            gid2 = phone.getGroupIdLevel2();
            carrierId = phone.getCarrierId();
            specificCarrierId = phone.getSpecificCarrierId();
        }
        return new CarrierIdentifier(mcc, mnc, spn, imsi, gid1, gid2, carrierId, specificCarrierId);
    }

    /** Returns the package name of a priveleged carrier app, or null if there is none. */
    @Nullable
    private String getCarrierPackageForPhoneId(int phoneId) {
        List<String> carrierPackageNames = TelephonyManager.from(mContext)
                .getCarrierPackageNamesForIntentAndPhone(
                        new Intent(CarrierService.CARRIER_SERVICE_INTERFACE), phoneId);
        if (carrierPackageNames != null && carrierPackageNames.size() > 0) {
            return carrierPackageNames.get(0);
        } else {
            return null;
        }
    }

    private String getIccIdForPhoneId(int phoneId) {
        if (!SubscriptionManager.isValidPhoneId(phoneId)) {
            return null;
        }
        Phone phone = PhoneFactory.getPhone(phoneId);
        if (phone == null) {
            return null;
        }
        return phone.getIccSerialNumber();
    }

    /**
     * Get the sim specific carrier id {@link TelephonyManager#getSimSpecificCarrierId()}
     */
    private int getSpecificCarrierIdForPhoneId(int phoneId) {
        if (!SubscriptionManager.isValidPhoneId(phoneId)) {
            return TelephonyManager.UNKNOWN_CARRIER_ID;
        }
        Phone phone = PhoneFactory.getPhone(phoneId);
        if (phone == null) {
            return TelephonyManager.UNKNOWN_CARRIER_ID;
        }
        return phone.getSpecificCarrierId();
    }

    /**
     * Get the sim carrier id {@link TelephonyManager#getSimCarrierId() }
     */
    private int getCarrierIdForPhoneId(int phoneId) {
        if (!SubscriptionManager.isValidPhoneId(phoneId)) {
            return TelephonyManager.UNKNOWN_CARRIER_ID;
        }
        Phone phone = PhoneFactory.getPhone(phoneId);
        if (phone == null) {
            return TelephonyManager.UNKNOWN_CARRIER_ID;
        }
        return phone.getCarrierId();
    }

    /**
     * Writes a bundle to an XML file.
     *
     * The bundle will be written to a file named after the package name, ICCID and
     * specific carrier id {@link TelephonyManager#getSimSpecificCarrierId()}. the same carrier
     * should have a single copy of XML file named after carrier id. However, it's still possible
     * that platform doesn't recognize the current sim carrier, we will use iccid + carrierid as
     * the canonical file name. carrierid can also handle the cases SIM OTA resolves to different
     * carrier while iccid remains the same.
     *
     * The file can be restored later with {@link @restoreConfigFromXml}. The XML output will
     * include the bundle and the current version of the specified package.
     *
     * In case of errors or invalid input, no file will be written.
     *
     * @param packageName   the name of the package from which we fetched this bundle.
     * @param extraString   An extra string to be used in the XML file name.
     * @param phoneId       the phone ID.
     * @param carrierId     contains all carrier-identifying information.
     * @param config        the bundle to be written. Null will be treated as an empty bundle.
     * @param isNoSimConfig whether this is invoked for noSimConfig or not.
     */
    private void saveConfigToXml(String packageName, @NonNull String extraString, int phoneId,
            CarrierIdentifier carrierId, PersistableBundle config, boolean isNoSimConfig) {
        if (packageName == null) {
            loge("Cannot save config with null packageName");
            return;
        }

        String fileName;
        if (isNoSimConfig) {
            fileName = getFilenameForNoSimConfig(packageName);
        } else {
            if (SubscriptionManager.getSimStateForSlotIndex(phoneId)
                    != TelephonyManager.SIM_STATE_LOADED) {
                loge("Skip save config because SIM records are not loaded.");
                return;
            }

            final String iccid = getIccIdForPhoneId(phoneId);
            final int cid = carrierId.getSpecificCarrierId();
            if (iccid == null) {
                loge("Cannot save config with null iccid.");
                return;
            }
            fileName = getFilenameForConfig(packageName, extraString, iccid, cid);
        }

        // b/32668103 Only save to file if config isn't empty.
        // In case of failure, not caching an empty bundle will
        // try loading config again on next power on or sim loaded.
        // Downside is for genuinely empty bundle, will bind and load
        // on every power on.
        if (config == null || config.isEmpty()) {
            return;
        }

        final String version = getPackageVersion(packageName);
        if (version == null) {
            loge("Failed to get package version for: " + packageName);
            return;
        }

        logdWithLocalLog(
                "Save config to xml, packagename: " + packageName + " phoneId: " + phoneId);

        FileOutputStream outFile = null;
        try {
            outFile = new FileOutputStream(new File(mContext.getFilesDir(), fileName));
            config.putString(KEY_VERSION, version);
            config.writeToStream(outFile);
            outFile.flush();
            outFile.close();
        } catch (IOException e) {
            loge(e.toString());
        }
    }

    private void saveConfigToXml(String packageName, @NonNull String extraString, int phoneId,
            CarrierIdentifier carrierId, PersistableBundle config) {
        saveConfigToXml(packageName, extraString, phoneId, carrierId, config, false);
    }

    private void saveNoSimConfigToXml(String packageName, PersistableBundle config) {
        saveConfigToXml(packageName, "", -1, null, config, true);
    }

    /**
     * Reads a bundle from an XML file.
     *
     * This restores a bundle that was written with {@link #saveConfigToXml}. This returns the saved
     * config bundle for the given package and phone ID.
     *
     * In case of errors, or if the saved config is from a different package version than the
     * current version, then null will be returned.
     *
     * @param packageName    the name of the package from which we fetched this bundle.
     * @param extraString    An extra string to be used in the XML file name.
     * @param phoneId        the phone ID.
     * @param isNoSimConfig  whether this is invoked for noSimConfig or not.
     * @return the bundle from the XML file. Returns null if there is no saved config, the saved
     * version does not match, or reading config fails.
     */
    private PersistableBundle restoreConfigFromXml(String packageName, @NonNull String extraString,
            int phoneId, boolean isNoSimConfig) {
        if (packageName == null) {
            loge("Cannot restore config with null packageName");
        }
        final String version = getPackageVersion(packageName);
        if (version == null) {
            loge("Failed to get package version for: " + packageName);
            return null;
        }

        String fileName;
        if (isNoSimConfig) {
            fileName = getFilenameForNoSimConfig(packageName);
        } else {
            if (SubscriptionManager.getSimStateForSlotIndex(phoneId)
                    != TelephonyManager.SIM_STATE_LOADED) {
                loge("Skip restore config because SIM records are not loaded.");
                return null;
            }

            final String iccid = getIccIdForPhoneId(phoneId);
            final int cid = getSpecificCarrierIdForPhoneId(phoneId);
            if (iccid == null) {
                loge("Cannot restore config with null iccid.");
                return null;
            }
            fileName = getFilenameForConfig(packageName, extraString, iccid, cid);
        }

        PersistableBundle restoredBundle = null;
        File file = null;
        FileInputStream inFile = null;
        try {
            file = new File(mContext.getFilesDir(),fileName);
            inFile = new FileInputStream(file);

            restoredBundle = PersistableBundle.readFromStream(inFile);
            String savedVersion = restoredBundle.getString(KEY_VERSION);
            restoredBundle.remove(KEY_VERSION);

            if (!version.equals(savedVersion)) {
                loge("Saved version mismatch: " + version + " vs " + savedVersion);
                restoredBundle = null;
            }

            inFile.close();
        } catch (FileNotFoundException e) {
            // Missing file is normal occurrence that might occur with a new sim or when restoring
            // an override file during boot and should not be treated as an error.
            if (file != null) logd("File not found: " + file.getPath());
        } catch (IOException e) {
            loge(e.toString());
        }

        return restoredBundle;
    }

    private PersistableBundle restoreConfigFromXml(String packageName, @NonNull String extraString,
            int phoneId) {
        return restoreConfigFromXml(packageName, extraString, phoneId, false);
    }

    private PersistableBundle restoreNoSimConfigFromXml(String packageName) {
        return restoreConfigFromXml(packageName, "", -1, true);
    }

    /**
     * Clears cached carrier config.
     * This deletes all saved XML files associated with the given package name. If packageName is
     * null, then it deletes all saved XML files.
     *
     * @param packageName the name of a carrier package, or null if all cached config should be
     *                    cleared.
     * @return true iff one or more files were deleted.
     */
    private boolean clearCachedConfigForPackage(final String packageName) {
        File dir = mContext.getFilesDir();
        File[] packageFiles = dir.listFiles(new FilenameFilter() {
            public boolean accept(File dir, String filename) {
                if (packageName != null) {
                    return filename.startsWith("carrierconfig-" + packageName + "-");
                } else {
                    return filename.startsWith("carrierconfig-");
                }
            }
        });
        if (packageFiles == null || packageFiles.length < 1) return false;
        for (File f : packageFiles) {
            logd("Deleting " + f.getName());
            f.delete();
        }
        return true;
    }

    /** Builds a canonical file name for a config file. */
    private static String getFilenameForConfig(
            @NonNull String packageName, @NonNull String extraString,
            @NonNull String iccid, int cid) {
        // the same carrier should have a single copy of XML file named after carrier id.
        // However, it's still possible that platform doesn't recognize the current sim carrier,
        // we will use iccid + carrierid as the canonical file name. carrierid can also handle the
        // cases SIM OTA resolves to different carrier while iccid remains the same.
        return "carrierconfig-" + packageName + extraString + "-" + iccid + "-" + cid + ".xml";
    }

    /** Builds a canonical file name for no SIM config file. */
    private String getFilenameForNoSimConfig(@NonNull String packageName) {
        return "carrierconfig-" + packageName + "-" + "nosim" + ".xml";
    }

    /** Return the current version code of a package, or null if the name is not found. */
    private String getPackageVersion(String packageName) {
        try {
            PackageInfo info = mContext.getPackageManager().getPackageInfo(packageName, 0);
            return Long.toString(info.getLongVersionCode());
        } catch (PackageManager.NameNotFoundException e) {
            return null;
        }
    }

    /**
     * Read up to date config.
     *
     * This reads config bundles for the given phoneId. That means getting the latest bundle from
     * the default app and a privileged carrier app, if present. This will not bind to an app if we
     * have a saved config file to use instead.
     */
    private void updateConfigForPhoneId(int phoneId) {
        mHandler.sendMessage(mHandler.obtainMessage(EVENT_DO_FETCH_DEFAULT, phoneId, -1));
    }

    private void onMultiSimConfigChanged() {
        for (int i = TelephonyManager.from(mContext).getActiveModemCount();
                i < mConfigFromDefaultApp.length; i++) {
            clearConfigForPhone(i, false);
        }
    }

    @Override
    @NonNull
    public PersistableBundle getConfigForSubId(int subId, String callingPackage) {
        return getConfigForSubIdWithFeature(subId, callingPackage, null);
    }

    @Override
    @NonNull
    public PersistableBundle getConfigForSubIdWithFeature(int subId, String callingPackage,
            String callingFeatureId) {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(mContext, subId, callingPackage,
                callingFeatureId, "getCarrierConfig")) {
            return new PersistableBundle();
        }

        int phoneId = SubscriptionManager.getPhoneId(subId);
        PersistableBundle retConfig = CarrierConfigManager.getDefaultConfig();
        if (SubscriptionManager.isValidPhoneId(phoneId)) {
            PersistableBundle config = mConfigFromDefaultApp[phoneId];
            if (config != null) {
                retConfig.putAll(config);
            }
            config = mConfigFromCarrierApp[phoneId];
            if (config != null) {
                retConfig.putAll(config);
            }
            config = mPersistentOverrideConfigs[phoneId];
            if (config != null) {
                retConfig.putAll(config);
            }
            config = mOverrideConfigs[phoneId];
            if (config != null) {
                retConfig.putAll(config);
            }
            // Ignore the theoretical case of the default app not being present since that won't
            // work in CarrierConfigLoader today.
            final boolean allConfigsApplied =
                    (mConfigFromCarrierApp[phoneId] != null
                        || getCarrierPackageForPhoneId(phoneId) == null)
                    && mConfigFromDefaultApp[phoneId] != null;
            retConfig.putBoolean(
                    CarrierConfigManager.KEY_CARRIER_CONFIG_APPLIED_BOOL, allConfigsApplied);
        } else {
            if (mNoSimConfig != null) {
                retConfig.putAll(mNoSimConfig);
            }
        }
        return retConfig;
    }

    @Override
    public void overrideConfig(int subscriptionId, @Nullable PersistableBundle overrides,
            boolean persistent) {
        mContext.enforceCallingOrSelfPermission(
                android.Manifest.permission.MODIFY_PHONE_STATE, null);
        //TODO: Also check for SHELL UID to restrict this method to testing only (b/131326259)
        int phoneId = SubscriptionManager.getPhoneId(subscriptionId);
        if (!SubscriptionManager.isValidPhoneId(phoneId)) {
            logd("Ignore invalid phoneId: " + phoneId + " for subId: " + subscriptionId);
            return;
        }
        overrideConfig(mOverrideConfigs, phoneId, overrides);

        if (persistent) {
            overrideConfig(mPersistentOverrideConfigs, phoneId, overrides);

            if (overrides != null) {
                final CarrierIdentifier carrierId = getCarrierIdentifierForPhoneId(phoneId);
                saveConfigToXml(mPlatformCarrierConfigPackage, OVERRIDE_PACKAGE_ADDITION, phoneId,
                        carrierId, mPersistentOverrideConfigs[phoneId]);
            } else {
                final String iccid = getIccIdForPhoneId(phoneId);
                final int cid = getSpecificCarrierIdForPhoneId(phoneId);
                String fileName = getFilenameForConfig(mPlatformCarrierConfigPackage,
                        OVERRIDE_PACKAGE_ADDITION, iccid, cid);
                File fileToDelete = new File(mContext.getFilesDir(), fileName);
                fileToDelete.delete();
            }
        }
        notifySubscriptionInfoUpdater(phoneId);
    }

    private void overrideConfig(@NonNull PersistableBundle[] currentOverrides, int phoneId,
            @Nullable PersistableBundle overrides) {
        if (overrides == null) {
            currentOverrides[phoneId] = new PersistableBundle();
        } else if (currentOverrides[phoneId] == null) {
            currentOverrides[phoneId] = overrides;
        } else {
            currentOverrides[phoneId].putAll(overrides);
        }
    }

    @Override
    public void notifyConfigChangedForSubId(int subId) {
        int phoneId = SubscriptionManager.getPhoneId(subId);
        if (!SubscriptionManager.isValidPhoneId(phoneId)) {
            logd("Ignore invalid phoneId: " + phoneId + " for subId: " + subId);
            return;
        }

        // Requires the calling app to be either a carrier privileged app for this subId or
        // system privileged app with MODIFY_PHONE_STATE permission.
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(mContext, subId,
                "Require carrier privileges or MODIFY_PHONE_STATE permission.");

        // This method should block until deleting has completed, so that an error which prevents us
        // from clearing the cache is passed back to the carrier app. With the files successfully
        // deleted, this can return and we will eventually bind to the carrier app.
        String callingPackageName = mContext.getPackageManager().getNameForUid(
                Binder.getCallingUid());
        clearCachedConfigForPackage(callingPackageName);
        updateConfigForPhoneId(phoneId);
    }

    @Override
    public void updateConfigForPhoneId(int phoneId, String simState) {
        mContext.enforceCallingOrSelfPermission(
                android.Manifest.permission.MODIFY_PHONE_STATE, null);
        logdWithLocalLog("Update config for phoneId: " + phoneId + " simState: " + simState);
        if (!SubscriptionManager.isValidPhoneId(phoneId)) {
            return;
        }
        // requires Java 7 for switch on string.
        switch (simState) {
            case IccCardConstants.INTENT_VALUE_ICC_ABSENT:
            case IccCardConstants.INTENT_VALUE_ICC_CARD_IO_ERROR:
            case IccCardConstants.INTENT_VALUE_ICC_CARD_RESTRICTED:
            case IccCardConstants.INTENT_VALUE_ICC_UNKNOWN:
            case IccCardConstants.INTENT_VALUE_ICC_NOT_READY:
                mHandler.sendMessage(mHandler.obtainMessage(EVENT_CLEAR_CONFIG, phoneId, -1));
                break;
            case IccCardConstants.INTENT_VALUE_ICC_LOADED:
            case IccCardConstants.INTENT_VALUE_ICC_LOCKED:
                updateConfigForPhoneId(phoneId);
                break;
        }
    }

    @Override
    public String getDefaultCarrierServicePackageName() {
        mContext.enforceCallingOrSelfPermission(
                android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE,
                "getDefaultCarrierServicePackageName");
        return mPlatformCarrierConfigPackage;
    }

    private void unbindIfBound(Context context, CarrierServiceConnection conn,
            int phoneId) {
        if (mServiceBound[phoneId]) {
            mServiceBound[phoneId] = false;
            context.unbindService(conn);
        }
    }

    private void unbindIfBoundForNoSimConfig(Context context, CarrierServiceConnection conn,
            int phoneId) {
        if (mServiceBoundForNoSimConfig[phoneId]) {
            mServiceBoundForNoSimConfig[phoneId] = false;
            context.unbindService(conn);
        }
    }

    /**
     * If {@code args} contains {@link #DUMP_ARG_REQUESTING_PACKAGE} and a following package name,
     * we'll also call {@link IBinder#dump} on the default carrier service (if bound) and the
     * specified carrier service (if bound). Typically, this is done for connectivity bug reports
     * where we don't call {@code dumpsys activity service all-non-platform} because that contains
     * too much info, but we still want to let carrier apps include their diagnostics.
     */
    @Override
    public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
        IndentingPrintWriter indentPW = new IndentingPrintWriter(pw, "    ");
        if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP)
                != PackageManager.PERMISSION_GRANTED) {
            indentPW.println("Permission Denial: can't dump carrierconfig from from pid="
                    + Binder.getCallingPid() + ", uid=" + Binder.getCallingUid());
            return;
        }
        String requestingPackage = null;
        int requestingPackageIndex = ArrayUtils.indexOf(args, DUMP_ARG_REQUESTING_PACKAGE);
        if (requestingPackageIndex >= 0 && requestingPackageIndex < args.length - 1
                && !TextUtils.isEmpty(args[requestingPackageIndex + 1])) {
            requestingPackage = args[requestingPackageIndex + 1];
            // Throws a SecurityException if the caller is impersonating another app in an effort to
            // dump extra info (which may contain PII the caller doesn't have a right to).
            enforceCallerIsSystemOrRequestingPackage(requestingPackage);
        }

        indentPW.println("CarrierConfigLoader: " + this);
        for (int i = 0; i < TelephonyManager.from(mContext).getActiveModemCount(); i++) {
            indentPW.println("Phone Id = " + i);
            // display default values in CarrierConfigManager
            printConfig(CarrierConfigManager.getDefaultConfig(), indentPW,
                    "Default Values from CarrierConfigManager");
            // display ConfigFromDefaultApp
            printConfig(mConfigFromDefaultApp[i], indentPW, "mConfigFromDefaultApp");
            // display ConfigFromCarrierApp
            printConfig(mConfigFromCarrierApp[i], indentPW, "mConfigFromCarrierApp");
            printConfig(mPersistentOverrideConfigs[i], indentPW, "mPersistentOverrideConfigs");
            printConfig(mOverrideConfigs[i], indentPW, "mOverrideConfigs");
        }

        printConfig(mNoSimConfig, indentPW, "mNoSimConfig");
        indentPW.println("CarrierConfigLoadingLog=");
        mCarrierConfigLoadingLog.dump(fd, indentPW, args);

        if (requestingPackage != null) {
            logd("Including default and requesting package " + requestingPackage
                    + " carrier services in dump");
            indentPW.println("");
            indentPW.println("Connected services");
            dumpCarrierServiceIfBound(fd, indentPW, "Default config package",
                    mPlatformCarrierConfigPackage, false /* considerCarrierPrivileges */);
            dumpCarrierServiceIfBound(fd, indentPW, "Requesting package", requestingPackage,
                    true /* considerCarrierPrivileges */);
        }
    }

    private void printConfig(PersistableBundle configApp, IndentingPrintWriter indentPW,
            String name) {
        indentPW.increaseIndent();
        if (configApp == null) {
            indentPW.println(name + " : null ");
            indentPW.decreaseIndent();
            indentPW.println("");
            return;
        }
        indentPW.println(name + " : ");
        List<String> sortedKeys = new ArrayList<String>(configApp.keySet());
        Collections.sort(sortedKeys);
        indentPW.increaseIndent();
        indentPW.increaseIndent();
        for (String key : sortedKeys) {
            if (configApp.get(key) != null && configApp.get(key) instanceof Object[]) {
                indentPW.println(key + " = " +
                        Arrays.toString((Object[]) configApp.get(key)));
            } else if (configApp.get(key) != null && configApp.get(key) instanceof int[]) {
                indentPW.println(key + " = " + Arrays.toString((int[]) configApp.get(key)));
            } else {
                indentPW.println(key + " = " + configApp.get(key));
            }
        }
        indentPW.decreaseIndent();
        indentPW.decreaseIndent();
        indentPW.decreaseIndent();
        indentPW.println("");
    }

    /**
     * Passes without problem when one of these conditions is true:
     * - The caller is a privileged UID (e.g. for dumpstate.cpp generating a bug report, where the
     * system knows the true caller plumbed in through the {@link android.os.BugreportManager} API).
     * - The caller's UID matches the supplied package.
     *
     * @throws SecurityException if none of the above conditions are met.
     */
    private void enforceCallerIsSystemOrRequestingPackage(String requestingPackage)
            throws SecurityException {
        final int callingUid = Binder.getCallingUid();
        if (callingUid == Process.ROOT_UID || callingUid == Process.SYSTEM_UID
                || callingUid == Process.SHELL_UID || callingUid == Process.PHONE_UID) {
            // Bug reports (dumpstate.cpp) run as SHELL, and let some other privileged UIDs through
            // as well.
            return;
        }
        // An app is trying to dump extra detail, block it if they aren't who they claim to be.
        AppOpsManager appOps = mContext.getSystemService(AppOpsManager.class);
        if (appOps == null) {
            throw new SecurityException("No AppOps");
        }
        // Will throw a SecurityException if the UID and package don't match.
        appOps.checkPackage(callingUid, requestingPackage);
    }

    /**
     * Searches for one or more appropriate {@link CarrierService} instances to dump based on the
     * current connections.
     *
     * @param targetPkgName             the target package name to dump carrier services for
     * @param considerCarrierPrivileges if true, allow a carrier service to be dumped if it shares
     *                                  carrier privileges with {@code targetPkgName};
     *                                  otherwise, only dump a carrier service if it is {@code
     *                                  targetPkgName}
     */
    private void dumpCarrierServiceIfBound(FileDescriptor fd, IndentingPrintWriter indentPW,
            String prefix, String targetPkgName, boolean considerCarrierPrivileges) {
        // Null package is possible if it's early in the boot process, there was a recent crash, we
        // loaded the config from XML most recently, or a SIM slot is empty. Carrier apps with
        // long-lived bindings should typically get dumped here regardless. Even if an app is being
        // used for multiple phoneIds, we assume that it's smart enough to handle that on its own,
        // and that in most cases we'd just be dumping duplicate information and bloating a report.
        indentPW.increaseIndent();
        indentPW.println(prefix + " : " + targetPkgName);
        Set<String> dumpedPkgNames = new ArraySet<>(mServiceConnection.length);
        for (CarrierServiceConnection connection : mServiceConnection) {
            if (connection == null || !SubscriptionManager.isValidPhoneId(connection.phoneId)
                    || TextUtils.isEmpty(connection.pkgName)) {
                continue;
            }
            final String servicePkgName = connection.pkgName;
            // Note: we intentionally ignore system components here because we should NOT match the
            // shell caller that's typically used for bug reports via non-BugreportManager triggers.
            final boolean exactPackageMatch = TextUtils.equals(targetPkgName, servicePkgName);
            final boolean carrierPrivilegesMatch =
                    considerCarrierPrivileges && hasCarrierPrivileges(targetPkgName,
                            connection.phoneId);
            if (!exactPackageMatch && !carrierPrivilegesMatch) continue;
            // Make sure this service is actually alive before trying to dump it. We don't pay
            // attention to mServiceBound[connection.phoneId] because typically carrier apps will
            // request long-lived bindings, and even if we unbind the app, it may still be alive due
            // to CarrierServiceBindHelper. Pull it out as a reference so even if it gets set to
            // null within the ServiceConnection during unbinding we can avoid an NPE.
            final IBinder service = connection.service;
            if (service == null || !service.isBinderAlive() || !service.pingBinder()) continue;
            // We've got a live service. Last check is just to make sure we don't dump a package
            // multiple times.
            if (!dumpedPkgNames.add(servicePkgName)) continue;
            if (!exactPackageMatch) {
                logd(targetPkgName + " has carrier privileges on phoneId " + connection.phoneId
                        + ", service provided by " + servicePkgName);
                indentPW.increaseIndent();
                indentPW.println("Proxy : " + servicePkgName);
                indentPW.decreaseIndent();
            }
            // Flush before we let the app output anything to ensure correct ordering of output.
            // Internally, Binder#dump calls flush on its printer after finishing so we don't
            // need to do anything after.
            indentPW.flush();
            try {
                logd("Dumping " + servicePkgName);
                // We don't need to give the carrier service any args.
                connection.service.dump(fd, null /* args */);
                logd("Done with " + servicePkgName);
            } catch (RemoteException e) {
                logd("RemoteException from " + servicePkgName, e);
                indentPW.increaseIndent();
                indentPW.println("RemoteException");
                indentPW.increaseIndent();
                e.printStackTrace(indentPW);
                indentPW.decreaseIndent();
                indentPW.decreaseIndent();
                // We won't retry this package again because now it's in dumpedPkgNames.
            }
            indentPW.println("");
        }
        if (dumpedPkgNames.isEmpty()) {
            indentPW.increaseIndent();
            indentPW.println("Not bound");
            indentPW.decreaseIndent();
            indentPW.println("");
        }
        indentPW.decreaseIndent();
    }

    private boolean hasCarrierPrivileges(String pkgName, int phoneId) {
        int[] subIds = SubscriptionManager.getSubId(phoneId);
        if (ArrayUtils.isEmpty(subIds)) {
            return false;
        }
        return TelephonyManager.from(mContext).createForSubscriptionId(
                subIds[0]).checkCarrierPrivilegesForPackage(pkgName)
                == TelephonyManager.CARRIER_PRIVILEGE_STATUS_HAS_ACCESS;
    }

    private class CarrierServiceConnection implements ServiceConnection {
        final int phoneId;
        final String pkgName;
        final int eventId;
        IBinder service;

        CarrierServiceConnection(int phoneId, String pkgName, int eventId) {
            this.phoneId = phoneId;
            this.pkgName = pkgName;
            this.eventId = eventId;
        }

        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            logd("Connected to config app: " + name.flattenToShortString());
            this.service = service;
            mHandler.sendMessage(mHandler.obtainMessage(eventId, phoneId, -1, this));
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            logd("Disconnected from config app: " + name.flattenToShortString());
            this.service = null;
        }

        @Override
        public void onBindingDied(ComponentName name) {
            logd("Binding died from config app: " + name.flattenToShortString());
            this.service = null;
        }

        @Override
        public void onNullBinding(ComponentName name) {
            logd("Null binding from config app: " + name.flattenToShortString());
            this.service = null;
        }
    }

    private class ConfigLoaderBroadcastReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            boolean replace = intent.getBooleanExtra(Intent.EXTRA_REPLACING, false);
            // If replace is true, only care ACTION_PACKAGE_REPLACED.
            if (replace && !Intent.ACTION_PACKAGE_REPLACED.equals(action)) {
                return;
            }

            switch (action) {
                case Intent.ACTION_BOOT_COMPLETED:
                    mHandler.sendMessage(mHandler.obtainMessage(EVENT_SYSTEM_UNLOCKED, null));
                    break;

                case Intent.ACTION_PACKAGE_ADDED:
                case Intent.ACTION_PACKAGE_REMOVED:
                case Intent.ACTION_PACKAGE_REPLACED:
                    int uid = intent.getIntExtra(Intent.EXTRA_UID, -1);
                    String packageName = mContext.getPackageManager().getNameForUid(uid);
                    if (packageName != null) {
                        // We don't have a phoneId for arg1.
                        mHandler.sendMessage(
                                mHandler.obtainMessage(EVENT_PACKAGE_CHANGED, packageName));
                    }
                    break;
            }
        }
    }

    private void logd(String msg) {
        Log.d(LOG_TAG, msg);
    }

    private void logd(String msg, Throwable tr) {
        Log.d(LOG_TAG, msg, tr);
    }

    private void logdWithLocalLog(String msg) {
        Log.d(LOG_TAG, msg);
        mCarrierConfigLoadingLog.log(msg);
    }

    private void loge(String msg) {
        Log.e(LOG_TAG, msg);
        mCarrierConfigLoadingLog.log(msg);
    }
}