1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.providers.telephony; 18 19 import android.content.ComponentName; 20 import android.content.ContentValues; 21 import android.content.Context; 22 import android.content.Intent; 23 import android.net.Uri; 24 import android.os.Process; 25 import android.provider.Telephony; 26 import android.text.TextUtils; 27 import android.util.Log; 28 29 import com.android.internal.telephony.SmsApplication; 30 31 /** 32 * Helpers 33 */ 34 public class ProviderUtil { 35 private final static String TAG = "SmsProvider"; 36 37 /** 38 * Check if a caller of the provider has restricted access, 39 * i.e. being non-system, non-phone, non-default SMS app 40 * 41 * @param context the context to use 42 * @param packageName the caller package name 43 * @param uid the caller uid 44 * @return true if the caller is not system, or phone or default sms app, false otherwise 45 */ isAccessRestricted(Context context, String packageName, int uid)46 public static boolean isAccessRestricted(Context context, String packageName, int uid) { 47 return (uid != Process.SYSTEM_UID 48 && uid != Process.PHONE_UID 49 && !SmsApplication.isDefaultSmsApplication(context, packageName)); 50 } 51 52 /** 53 * Whether should set CREATOR for an insertion 54 * 55 * @param values The content of the message 56 * @param uid The caller UID of the insertion 57 * @return true if we should set CREATOR, false otherwise 58 */ shouldSetCreator(ContentValues values, int uid)59 public static boolean shouldSetCreator(ContentValues values, int uid) { 60 return (uid != Process.SYSTEM_UID && uid != Process.PHONE_UID) || 61 (!values.containsKey(Telephony.Sms.CREATOR) && 62 !values.containsKey(Telephony.Mms.CREATOR)); 63 } 64 65 /** 66 * Whether should remove CREATOR for an update 67 * 68 * @param values The content of the message 69 * @param uid The caller UID of the update 70 * @return true if we should remove CREATOR, false otherwise 71 */ shouldRemoveCreator(ContentValues values, int uid)72 public static boolean shouldRemoveCreator(ContentValues values, int uid) { 73 return (uid != Process.SYSTEM_UID && uid != Process.PHONE_UID) && 74 (values.containsKey(Telephony.Sms.CREATOR) || 75 values.containsKey(Telephony.Mms.CREATOR)); 76 } 77 78 /** 79 * Notify the default SMS app of an SMS/MMS provider change if the change is being made 80 * by a package other than the default SMS app itself. 81 * 82 * @param uri The uri the provider change applies to 83 * @param callingPackage The package name of the provider caller 84 * @param Context 85 */ notifyIfNotDefaultSmsApp(final Uri uri, final String callingPackage, final Context context)86 public static void notifyIfNotDefaultSmsApp(final Uri uri, final String callingPackage, 87 final Context context) { 88 if (TextUtils.equals(callingPackage, Telephony.Sms.getDefaultSmsPackage(context))) { 89 if (Log.isLoggable(TAG, Log.VERBOSE)) { 90 Log.d(TAG, "notifyIfNotDefaultSmsApp - called from default sms app"); 91 } 92 return; 93 } 94 // Direct the intent to only the default SMS app, and only if the SMS app has a receiver 95 // for the intent. 96 ComponentName componentName = 97 SmsApplication.getDefaultExternalTelephonyProviderChangedApplication(context, true); 98 if (componentName == null) { 99 return; // the default sms app doesn't have a receiver for this intent 100 } 101 102 final Intent intent = 103 new Intent(Telephony.Sms.Intents.ACTION_EXTERNAL_PROVIDER_CHANGE); 104 intent.setFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING); 105 intent.setComponent(componentName); 106 if (uri != null) { 107 intent.setData(uri); 108 } 109 if (Log.isLoggable(TAG, Log.VERBOSE)) { 110 Log.d(TAG, "notifyIfNotDefaultSmsApp - called from " + callingPackage + ", notifying"); 111 } 112 intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION); 113 context.sendBroadcast(intent); 114 } 115 getCredentialEncryptedContext(Context context)116 public static Context getCredentialEncryptedContext(Context context) { 117 if (context.isCredentialProtectedStorage()) { 118 return context; 119 } 120 return context.createCredentialProtectedStorageContext(); 121 } 122 getDeviceEncryptedContext(Context context)123 public static Context getDeviceEncryptedContext(Context context) { 124 if (context.isDeviceProtectedStorage()) { 125 return context; 126 } 127 return context.createDeviceProtectedStorageContext(); 128 } 129 } 130