SmsUsageMonitor.java revision 81ddb888952763b5eb7a4a38fb293fc86b897968
1/* 2 * Copyright (C) 2011 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 17package com.android.internal.telephony; 18 19import android.app.AppGlobals; 20import android.content.ContentResolver; 21import android.content.Context; 22import android.content.pm.ApplicationInfo; 23import android.content.res.XmlResourceParser; 24import android.database.ContentObserver; 25import android.os.Binder; 26import android.os.Handler; 27import android.os.Message; 28import android.os.Process; 29import android.os.RemoteException; 30import android.os.UserHandle; 31import android.provider.Settings; 32import android.telephony.PhoneNumberUtils; 33import android.util.AtomicFile; 34import android.util.Log; 35import android.util.Xml; 36 37import com.android.internal.util.FastXmlSerializer; 38import com.android.internal.util.XmlUtils; 39 40import org.xmlpull.v1.XmlPullParser; 41import org.xmlpull.v1.XmlPullParserException; 42import org.xmlpull.v1.XmlPullParserFactory; 43import org.xmlpull.v1.XmlSerializer; 44 45import java.io.File; 46import java.io.FileInputStream; 47import java.io.FileNotFoundException; 48import java.io.FileOutputStream; 49import java.io.FileReader; 50import java.io.IOException; 51import java.io.StringReader; 52import java.util.ArrayList; 53import java.util.concurrent.atomic.AtomicBoolean; 54import java.util.HashMap; 55import java.util.Iterator; 56import java.util.Map; 57import java.util.regex.Pattern; 58 59/** 60 * Implement the per-application based SMS control, which limits the number of 61 * SMS/MMS messages an app can send in the checking period. 62 * 63 * This code was formerly part of {@link SMSDispatcher}, and has been moved 64 * into a separate class to support instantiation of multiple SMSDispatchers on 65 * dual-mode devices that require support for both 3GPP and 3GPP2 format messages. 66 */ 67public class SmsUsageMonitor { 68 private static final String TAG = "SmsUsageMonitor"; 69 private static final boolean DBG = false; 70 private static final boolean VDBG = false; 71 72 private static final String SHORT_CODE_PATH = "/data/misc/sms/codes"; 73 74 /** Default checking period for SMS sent without user permission. */ 75 private static final int DEFAULT_SMS_CHECK_PERIOD = 1800000; // 30 minutes 76 77 /** Default number of SMS sent in checking period without user permission. */ 78 private static final int DEFAULT_SMS_MAX_COUNT = 30; 79 80 /** Return value from {@link #checkDestination} for regular phone numbers. */ 81 static final int CATEGORY_NOT_SHORT_CODE = 0; 82 83 /** Return value from {@link #checkDestination} for free (no cost) short codes. */ 84 static final int CATEGORY_FREE_SHORT_CODE = 1; 85 86 /** Return value from {@link #checkDestination} for standard rate (non-premium) short codes. */ 87 static final int CATEGORY_STANDARD_SHORT_CODE = 2; 88 89 /** Return value from {@link #checkDestination} for possible premium short codes. */ 90 static final int CATEGORY_POSSIBLE_PREMIUM_SHORT_CODE = 3; 91 92 /** Return value from {@link #checkDestination} for premium short codes. */ 93 static final int CATEGORY_PREMIUM_SHORT_CODE = 4; 94 95 /** @hide */ 96 public static int mergeShortCodeCategories(int type1, int type2) { 97 if (type1 > type2) return type1; 98 return type2; 99 } 100 101 /** Premium SMS permission for a new package (ask user when first premium SMS sent). */ 102 public static final int PREMIUM_SMS_PERMISSION_UNKNOWN = 0; 103 104 /** Default premium SMS permission (ask user for each premium SMS sent). */ 105 public static final int PREMIUM_SMS_PERMISSION_ASK_USER = 1; 106 107 /** Premium SMS permission when the owner has denied the app from sending premium SMS. */ 108 public static final int PREMIUM_SMS_PERMISSION_NEVER_ALLOW = 2; 109 110 /** Premium SMS permission when the owner has allowed the app to send premium SMS. */ 111 public static final int PREMIUM_SMS_PERMISSION_ALWAYS_ALLOW = 3; 112 113 private final int mCheckPeriod; 114 private final int mMaxAllowed; 115 116 private final HashMap<String, ArrayList<Long>> mSmsStamp = 117 new HashMap<String, ArrayList<Long>>(); 118 119 /** Context for retrieving regexes from XML resource. */ 120 private final Context mContext; 121 122 /** Country code for the cached short code pattern matcher. */ 123 private String mCurrentCountry; 124 125 /** Cached short code pattern matcher for {@link #mCurrentCountry}. */ 126 private ShortCodePatternMatcher mCurrentPatternMatcher; 127 128 /** Notice when the enabled setting changes - can be changed through gservices */ 129 private final AtomicBoolean mCheckEnabled = new AtomicBoolean(true); 130 131 /** Cached short code regex patterns from secure settings for {@link #mCurrentCountry}. */ 132 private String mSettingsShortCodePatterns; 133 134 /** Handler for responding to content observer updates. */ 135 private final SettingsObserverHandler mSettingsObserverHandler; 136 137 /** File holding the patterns */ 138 private final File mPatternFile = new File(SHORT_CODE_PATH); 139 140 /** Last modified time for pattern file */ 141 private long mPatternFileLastModified = 0; 142 143 /** Directory for per-app SMS permission XML file. */ 144 private static final String SMS_POLICY_FILE_DIRECTORY = "/data/radio"; 145 146 /** Per-app SMS permission XML filename. */ 147 private static final String SMS_POLICY_FILE_NAME = "premium_sms_policy.xml"; 148 149 /** XML tag for root element. */ 150 private static final String TAG_SHORTCODES = "shortcodes"; 151 152 /** XML tag for short code patterns for a specific country. */ 153 private static final String TAG_SHORTCODE = "shortcode"; 154 155 /** XML attribute for the country code. */ 156 private static final String ATTR_COUNTRY = "country"; 157 158 /** XML attribute for the short code regex pattern. */ 159 private static final String ATTR_PATTERN = "pattern"; 160 161 /** XML attribute for the premium short code regex pattern. */ 162 private static final String ATTR_PREMIUM = "premium"; 163 164 /** XML attribute for the free short code regex pattern. */ 165 private static final String ATTR_FREE = "free"; 166 167 /** XML attribute for the standard rate short code regex pattern. */ 168 private static final String ATTR_STANDARD = "standard"; 169 170 /** Stored copy of premium SMS package permissions. */ 171 private AtomicFile mPolicyFile; 172 173 /** Loaded copy of premium SMS package permissions. */ 174 private final HashMap<String, Integer> mPremiumSmsPolicy = new HashMap<String, Integer>(); 175 176 /** XML tag for root element of premium SMS permissions. */ 177 private static final String TAG_SMS_POLICY_BODY = "premium-sms-policy"; 178 179 /** XML tag for a package. */ 180 private static final String TAG_PACKAGE = "package"; 181 182 /** XML attribute for the package name. */ 183 private static final String ATTR_PACKAGE_NAME = "name"; 184 185 /** XML attribute for the package's premium SMS permission (integer type). */ 186 private static final String ATTR_PACKAGE_SMS_POLICY = "sms-policy"; 187 188 /** 189 * SMS short code regex pattern matcher for a specific country. 190 */ 191 private static final class ShortCodePatternMatcher { 192 private final Pattern mShortCodePattern; 193 private final Pattern mPremiumShortCodePattern; 194 private final Pattern mFreeShortCodePattern; 195 private final Pattern mStandardShortCodePattern; 196 197 ShortCodePatternMatcher(String shortCodeRegex, String premiumShortCodeRegex, 198 String freeShortCodeRegex, String standardShortCodeRegex) { 199 mShortCodePattern = (shortCodeRegex != null ? Pattern.compile(shortCodeRegex) : null); 200 mPremiumShortCodePattern = (premiumShortCodeRegex != null ? 201 Pattern.compile(premiumShortCodeRegex) : null); 202 mFreeShortCodePattern = (freeShortCodeRegex != null ? 203 Pattern.compile(freeShortCodeRegex) : null); 204 mStandardShortCodePattern = (standardShortCodeRegex != null ? 205 Pattern.compile(standardShortCodeRegex) : null); 206 } 207 208 int getNumberCategory(String phoneNumber) { 209 if (mFreeShortCodePattern != null && mFreeShortCodePattern.matcher(phoneNumber) 210 .matches()) { 211 return CATEGORY_FREE_SHORT_CODE; 212 } 213 if (mStandardShortCodePattern != null && mStandardShortCodePattern.matcher(phoneNumber) 214 .matches()) { 215 return CATEGORY_STANDARD_SHORT_CODE; 216 } 217 if (mPremiumShortCodePattern != null && mPremiumShortCodePattern.matcher(phoneNumber) 218 .matches()) { 219 return CATEGORY_PREMIUM_SHORT_CODE; 220 } 221 if (mShortCodePattern != null && mShortCodePattern.matcher(phoneNumber).matches()) { 222 return CATEGORY_POSSIBLE_PREMIUM_SHORT_CODE; 223 } 224 return CATEGORY_NOT_SHORT_CODE; 225 } 226 } 227 228 /** 229 * Observe the secure setting for enable flag 230 */ 231 private static class SettingsObserver extends ContentObserver { 232 private final Context mContext; 233 private final AtomicBoolean mEnabled; 234 235 SettingsObserver(Handler handler, Context context, AtomicBoolean enabled) { 236 super(handler); 237 mContext = context; 238 mEnabled = enabled; 239 onChange(false); 240 } 241 242 @Override 243 public void onChange(boolean selfChange) { 244 mEnabled.set(Settings.Global.getInt(mContext.getContentResolver(), 245 Settings.Global.SMS_SHORT_CODE_CONFIRMATION, 1) != 0); 246 } 247 } 248 249 private static class SettingsObserverHandler extends Handler { 250 SettingsObserverHandler(Context context, AtomicBoolean enabled) { 251 ContentResolver resolver = context.getContentResolver(); 252 ContentObserver globalObserver = new SettingsObserver(this, context, enabled); 253 resolver.registerContentObserver(Settings.Global.getUriFor( 254 Settings.Global.SMS_SHORT_CODE_CONFIRMATION), false, globalObserver); 255 } 256 } 257 258 /** 259 * Create SMS usage monitor. 260 * @param context the context to use to load resources and get TelephonyManager service 261 */ 262 public SmsUsageMonitor(Context context) { 263 mContext = context; 264 ContentResolver resolver = context.getContentResolver(); 265 266 mMaxAllowed = Settings.Global.getInt(resolver, 267 Settings.Global.SMS_OUTGOING_CHECK_MAX_COUNT, 268 DEFAULT_SMS_MAX_COUNT); 269 270 mCheckPeriod = Settings.Global.getInt(resolver, 271 Settings.Global.SMS_OUTGOING_CHECK_INTERVAL_MS, 272 DEFAULT_SMS_CHECK_PERIOD); 273 274 mSettingsObserverHandler = new SettingsObserverHandler(mContext, mCheckEnabled); 275 276 loadPremiumSmsPolicyDb(); 277 } 278 279 /** 280 * Return a pattern matcher object for the specified country. 281 * @param country the country to search for 282 * @return a {@link ShortCodePatternMatcher} for the specified country, or null if not found 283 */ 284 private ShortCodePatternMatcher getPatternMatcherFromFile(String country) { 285 FileReader patternReader = null; 286 XmlPullParser parser = null; 287 try { 288 patternReader = new FileReader(mPatternFile); 289 parser = Xml.newPullParser(); 290 parser.setInput(patternReader); 291 return getPatternMatcherFromXmlParser(parser, country); 292 } catch (FileNotFoundException e) { 293 Log.e(TAG, "Short Code Pattern File not found"); 294 } catch (XmlPullParserException e) { 295 Log.e(TAG, "XML parser exception reading short code pattern file", e); 296 } finally { 297 mPatternFileLastModified = mPatternFile.lastModified(); 298 if (patternReader != null) { 299 try { 300 patternReader.close(); 301 } catch (IOException e) {} 302 } 303 } 304 return null; 305 } 306 307 private ShortCodePatternMatcher getPatternMatcherFromResource(String country) { 308 int id = com.android.internal.R.xml.sms_short_codes; 309 XmlResourceParser parser = null; 310 try { 311 parser = mContext.getResources().getXml(id); 312 return getPatternMatcherFromXmlParser(parser, country); 313 } finally { 314 if (parser != null) parser.close(); 315 } 316 } 317 318 private ShortCodePatternMatcher getPatternMatcherFromXmlParser(XmlPullParser parser, 319 String country) { 320 try { 321 XmlUtils.beginDocument(parser, TAG_SHORTCODES); 322 323 while (true) { 324 XmlUtils.nextElement(parser); 325 String element = parser.getName(); 326 if (element == null) break; 327 328 if (element.equals(TAG_SHORTCODE)) { 329 String currentCountry = parser.getAttributeValue(null, ATTR_COUNTRY); 330 if (country.equals(currentCountry)) { 331 String pattern = parser.getAttributeValue(null, ATTR_PATTERN); 332 String premium = parser.getAttributeValue(null, ATTR_PREMIUM); 333 String free = parser.getAttributeValue(null, ATTR_FREE); 334 String standard = parser.getAttributeValue(null, ATTR_STANDARD); 335 return new ShortCodePatternMatcher(pattern, premium, free, standard); 336 } 337 } else { 338 Log.e(TAG, "Error: skipping unknown XML tag " + element); 339 } 340 } 341 } catch (XmlPullParserException e) { 342 Log.e(TAG, "XML parser exception reading short code patterns", e); 343 } catch (IOException e) { 344 Log.e(TAG, "I/O exception reading short code patterns", e); 345 } 346 return null; // country not found 347 } 348 349 /** Clear the SMS application list for disposal. */ 350 void dispose() { 351 mSmsStamp.clear(); 352 } 353 354 /** 355 * Check to see if an application is allowed to send new SMS messages, and confirm with 356 * user if the send limit was reached or if a non-system app is potentially sending to a 357 * premium SMS short code or number. 358 * 359 * @param appName the package name of the app requesting to send an SMS 360 * @param smsWaiting the number of new messages desired to send 361 * @return true if application is allowed to send the requested number 362 * of new sms messages 363 */ 364 public boolean check(String appName, int smsWaiting) { 365 synchronized (mSmsStamp) { 366 removeExpiredTimestamps(); 367 368 ArrayList<Long> sentList = mSmsStamp.get(appName); 369 if (sentList == null) { 370 sentList = new ArrayList<Long>(); 371 mSmsStamp.put(appName, sentList); 372 } 373 374 return isUnderLimit(sentList, smsWaiting); 375 } 376 } 377 378 /** 379 * Check if the destination is a possible premium short code. 380 * NOTE: the caller is expected to strip non-digits from the destination number with 381 * {@link PhoneNumberUtils#extractNetworkPortion} before calling this method. 382 * This happens in {@link SMSDispatcher#sendRawPdu} so that we use the same phone number 383 * for testing and in the user confirmation dialog if the user needs to confirm the number. 384 * This makes it difficult for malware to fool the user or the short code pattern matcher 385 * by using non-ASCII characters to make the number appear to be different from the real 386 * destination phone number. 387 * 388 * @param destAddress the destination address to test for possible short code 389 * @return {@link #CATEGORY_NOT_SHORT_CODE}, {@link #CATEGORY_FREE_SHORT_CODE}, 390 * {@link #CATEGORY_POSSIBLE_PREMIUM_SHORT_CODE}, or {@link #CATEGORY_PREMIUM_SHORT_CODE}. 391 */ 392 public int checkDestination(String destAddress, String countryIso) { 393 synchronized (mSettingsObserverHandler) { 394 // always allow emergency numbers 395 if (PhoneNumberUtils.isEmergencyNumber(destAddress, countryIso)) { 396 return CATEGORY_NOT_SHORT_CODE; 397 } 398 // always allow if the feature is disabled 399 if (!mCheckEnabled.get()) { 400 return CATEGORY_NOT_SHORT_CODE; 401 } 402 403 ShortCodePatternMatcher patternMatcher = null; 404 405 if (countryIso != null) { 406 if (mCurrentCountry == null || !countryIso.equals(mCurrentCountry) || 407 mPatternFile.lastModified() != mPatternFileLastModified) { 408 if (mPatternFile.exists()) { 409 if (DBG) Log.d(TAG, "Loading SMS Short Code patterns from file"); 410 patternMatcher = getPatternMatcherFromFile(countryIso); 411 } else { 412 if (DBG) Log.d(TAG, "Loading SMS Short Code patterns from resource"); 413 patternMatcher = getPatternMatcherFromResource(countryIso); 414 } 415 mCurrentCountry = countryIso; 416 mCurrentPatternMatcher = patternMatcher; // may be null if not found 417 } 418 } 419 420 if (patternMatcher != null) { 421 return patternMatcher.getNumberCategory(destAddress); 422 } else { 423 // Generic rule: numbers of 5 digits or less are considered potential short codes 424 Log.e(TAG, "No patterns for \"" + countryIso + "\": using generic short code rule"); 425 if (destAddress.length() <= 5) { 426 return CATEGORY_POSSIBLE_PREMIUM_SHORT_CODE; 427 } else { 428 return CATEGORY_NOT_SHORT_CODE; 429 } 430 } 431 } 432 } 433 434 /** 435 * Load the premium SMS policy from an XML file. 436 * Based on code from NotificationManagerService. 437 */ 438 private void loadPremiumSmsPolicyDb() { 439 synchronized (mPremiumSmsPolicy) { 440 if (mPolicyFile == null) { 441 File dir = new File(SMS_POLICY_FILE_DIRECTORY); 442 mPolicyFile = new AtomicFile(new File(dir, SMS_POLICY_FILE_NAME)); 443 444 mPremiumSmsPolicy.clear(); 445 446 FileInputStream infile = null; 447 try { 448 infile = mPolicyFile.openRead(); 449 final XmlPullParser parser = Xml.newPullParser(); 450 parser.setInput(infile, null); 451 452 XmlUtils.beginDocument(parser, TAG_SMS_POLICY_BODY); 453 454 while (true) { 455 XmlUtils.nextElement(parser); 456 457 String element = parser.getName(); 458 if (element == null) break; 459 460 if (element.equals(TAG_PACKAGE)) { 461 String packageName = parser.getAttributeValue(null, ATTR_PACKAGE_NAME); 462 String policy = parser.getAttributeValue(null, ATTR_PACKAGE_SMS_POLICY); 463 if (packageName == null) { 464 Log.e(TAG, "Error: missing package name attribute"); 465 } else if (policy == null) { 466 Log.e(TAG, "Error: missing package policy attribute"); 467 } else try { 468 mPremiumSmsPolicy.put(packageName, Integer.parseInt(policy)); 469 } catch (NumberFormatException e) { 470 Log.e(TAG, "Error: non-numeric policy type " + policy); 471 } 472 } else { 473 Log.e(TAG, "Error: skipping unknown XML tag " + element); 474 } 475 } 476 } catch (FileNotFoundException e) { 477 // No data yet 478 } catch (IOException e) { 479 Log.e(TAG, "Unable to read premium SMS policy database", e); 480 } catch (NumberFormatException e) { 481 Log.e(TAG, "Unable to parse premium SMS policy database", e); 482 } catch (XmlPullParserException e) { 483 Log.e(TAG, "Unable to parse premium SMS policy database", e); 484 } finally { 485 if (infile != null) { 486 try { 487 infile.close(); 488 } catch (IOException ignored) { 489 } 490 } 491 } 492 } 493 } 494 } 495 496 /** 497 * Persist the premium SMS policy to an XML file. 498 * Based on code from NotificationManagerService. 499 */ 500 private void writePremiumSmsPolicyDb() { 501 synchronized (mPremiumSmsPolicy) { 502 FileOutputStream outfile = null; 503 try { 504 outfile = mPolicyFile.startWrite(); 505 506 XmlSerializer out = new FastXmlSerializer(); 507 out.setOutput(outfile, "utf-8"); 508 509 out.startDocument(null, true); 510 511 out.startTag(null, TAG_SMS_POLICY_BODY); 512 513 for (Map.Entry<String, Integer> policy : mPremiumSmsPolicy.entrySet()) { 514 out.startTag(null, TAG_PACKAGE); 515 out.attribute(null, ATTR_PACKAGE_NAME, policy.getKey()); 516 out.attribute(null, ATTR_PACKAGE_SMS_POLICY, policy.getValue().toString()); 517 out.endTag(null, TAG_PACKAGE); 518 } 519 520 out.endTag(null, TAG_SMS_POLICY_BODY); 521 out.endDocument(); 522 523 mPolicyFile.finishWrite(outfile); 524 } catch (IOException e) { 525 Log.e(TAG, "Unable to write premium SMS policy database", e); 526 if (outfile != null) { 527 mPolicyFile.failWrite(outfile); 528 } 529 } 530 } 531 } 532 533 /** 534 * Returns the premium SMS permission for the specified package. If the package has never 535 * been seen before, the default {@link #PREMIUM_SMS_PERMISSION_ASK_USER} 536 * will be returned. 537 * @param packageName the name of the package to query permission 538 * @return one of {@link #PREMIUM_SMS_PERMISSION_UNKNOWN}, 539 * {@link #PREMIUM_SMS_PERMISSION_ASK_USER}, 540 * {@link #PREMIUM_SMS_PERMISSION_NEVER_ALLOW}, or 541 * {@link #PREMIUM_SMS_PERMISSION_ALWAYS_ALLOW} 542 * @throws SecurityException if the caller is not a system process 543 */ 544 public int getPremiumSmsPermission(String packageName) { 545 checkCallerIsSystemOrSameApp(packageName); 546 synchronized (mPremiumSmsPolicy) { 547 Integer policy = mPremiumSmsPolicy.get(packageName); 548 if (policy == null) { 549 return PREMIUM_SMS_PERMISSION_UNKNOWN; 550 } else { 551 return policy; 552 } 553 } 554 } 555 556 /** 557 * Sets the premium SMS permission for the specified package and save the value asynchronously 558 * to persistent storage. 559 * @param packageName the name of the package to set permission 560 * @param permission one of {@link #PREMIUM_SMS_PERMISSION_ASK_USER}, 561 * {@link #PREMIUM_SMS_PERMISSION_NEVER_ALLOW}, or 562 * {@link #PREMIUM_SMS_PERMISSION_ALWAYS_ALLOW} 563 * @throws SecurityException if the caller is not a system process 564 */ 565 public void setPremiumSmsPermission(String packageName, int permission) { 566 checkCallerIsSystemOrPhoneApp(); 567 if (permission < PREMIUM_SMS_PERMISSION_ASK_USER 568 || permission > PREMIUM_SMS_PERMISSION_ALWAYS_ALLOW) { 569 throw new IllegalArgumentException("invalid SMS permission type " + permission); 570 } 571 synchronized (mPremiumSmsPolicy) { 572 mPremiumSmsPolicy.put(packageName, permission); 573 } 574 // write policy file in the background 575 new Thread(new Runnable() { 576 @Override 577 public void run() { 578 writePremiumSmsPolicyDb(); 579 } 580 }).start(); 581 } 582 583 private static void checkCallerIsSystemOrSameApp(String pkg) { 584 int uid = Binder.getCallingUid(); 585 if (UserHandle.getAppId(uid) == Process.SYSTEM_UID || uid == 0) { 586 return; 587 } 588 try { 589 ApplicationInfo ai = AppGlobals.getPackageManager().getApplicationInfo( 590 pkg, 0, UserHandle.getCallingUserId()); 591 if (!UserHandle.isSameApp(ai.uid, uid)) { 592 throw new SecurityException("Calling uid " + uid + " gave package" 593 + pkg + " which is owned by uid " + ai.uid); 594 } 595 } catch (RemoteException re) { 596 throw new SecurityException("Unknown package " + pkg + "\n" + re); 597 } 598 } 599 600 private static void checkCallerIsSystemOrPhoneApp() { 601 int uid = Binder.getCallingUid(); 602 int appId = UserHandle.getAppId(uid); 603 if (appId == Process.SYSTEM_UID || appId == Process.PHONE_UID || uid == 0) { 604 return; 605 } 606 throw new SecurityException("Disallowed call for uid " + uid); 607 } 608 609 /** 610 * Remove keys containing only old timestamps. This can happen if an SMS app is used 611 * to send messages and then uninstalled. 612 */ 613 private void removeExpiredTimestamps() { 614 long beginCheckPeriod = System.currentTimeMillis() - mCheckPeriod; 615 616 synchronized (mSmsStamp) { 617 Iterator<Map.Entry<String, ArrayList<Long>>> iter = mSmsStamp.entrySet().iterator(); 618 while (iter.hasNext()) { 619 Map.Entry<String, ArrayList<Long>> entry = iter.next(); 620 ArrayList<Long> oldList = entry.getValue(); 621 if (oldList.isEmpty() || oldList.get(oldList.size() - 1) < beginCheckPeriod) { 622 iter.remove(); 623 } 624 } 625 } 626 } 627 628 private boolean isUnderLimit(ArrayList<Long> sent, int smsWaiting) { 629 Long ct = System.currentTimeMillis(); 630 long beginCheckPeriod = ct - mCheckPeriod; 631 632 if (VDBG) log("SMS send size=" + sent.size() + " time=" + ct); 633 634 while (!sent.isEmpty() && sent.get(0) < beginCheckPeriod) { 635 sent.remove(0); 636 } 637 638 if ((sent.size() + smsWaiting) <= mMaxAllowed) { 639 for (int i = 0; i < smsWaiting; i++ ) { 640 sent.add(ct); 641 } 642 return true; 643 } 644 return false; 645 } 646 647 private static void log(String msg) { 648 Log.d(TAG, msg); 649 } 650} 651