DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (31ec81b5d7bb)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "mozilla/Attributes.h"
#include "mozilla/DebugOnly.h"

#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/unused.h"
#include "nsPermissionManager.h"
#include "nsPermission.h"
#include "nsCRT.h"
#include "nsNetUtil.h"
#include "nsCOMArray.h"
#include "nsArrayEnumerator.h"
#include "nsTArray.h"
#include "nsReadableUtils.h"
#include "nsILineInputStream.h"
#include "nsIIDNService.h"
#include "nsAppDirectoryServiceDefs.h"
#include "prprf.h"
#include "mozilla/storage.h"
#include "mozilla/Attributes.h"
#include "nsXULAppAPI.h"
#include "nsIPrincipal.h"
#include "nsContentUtils.h"
#include "nsIScriptSecurityManager.h"
#include "nsIAppsService.h"
#include "mozIApplication.h"
#include "nsIEffectiveTLDService.h"
#include "nsPIDOMWindow.h"
#include "nsIDocument.h"
#include "mozilla/net/NeckoMessageUtils.h"

static nsPermissionManager *gPermissionManager = nullptr;

using mozilla::dom::ContentParent;
using mozilla::dom::ContentChild;
using mozilla::unused; // ha!

static bool
IsChildProcess()
{
  return XRE_GetProcessType() == GeckoProcessType_Content;
}

/**
 * @returns The child process object, or if we are not in the child
 *          process, nullptr.
 */
static ContentChild*
ChildProcess()
{
  if (IsChildProcess()) {
    ContentChild* cpc = ContentChild::GetSingleton();
    if (!cpc)
      NS_RUNTIMEABORT("Content Process is nullptr!");
    return cpc;
  }

  return nullptr;
}


#define ENSURE_NOT_CHILD_PROCESS_(onError) \
  PR_BEGIN_MACRO \
  if (IsChildProcess()) { \
    NS_ERROR("Cannot perform action in content process!"); \
    onError \
  } \
  PR_END_MACRO

#define ENSURE_NOT_CHILD_PROCESS \
  ENSURE_NOT_CHILD_PROCESS_({ return NS_ERROR_NOT_AVAILABLE; })

#define ENSURE_NOT_CHILD_PROCESS_NORET \
  ENSURE_NOT_CHILD_PROCESS_(;)

////////////////////////////////////////////////////////////////////////////////

namespace {

nsresult
GetPrincipal(const nsACString& aHost, uint32_t aAppId, bool aIsInBrowserElement,
             nsIPrincipal** aPrincipal)
{
  nsIScriptSecurityManager* secMan = nsContentUtils::GetSecurityManager();
  NS_ENSURE_TRUE(secMan, NS_ERROR_FAILURE);

  nsCOMPtr<nsIURI> uri;
  nsresult rv = NS_NewURI(getter_AddRefs(uri), aHost);
  if (NS_FAILED(rv)) {
    // NOTE: most callers will end up here because we don't append "http://" for
    // hosts. It's fine to arbitrary use "http://" because, for those entries,
    // we will actually just use the host.
    rv = NS_NewURI(getter_AddRefs(uri), NS_LITERAL_CSTRING("http://") + aHost);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  return secMan->GetAppCodebasePrincipal(uri, aAppId, aIsInBrowserElement, aPrincipal);
}

nsresult
GetPrincipal(nsIURI* aURI, nsIPrincipal** aPrincipal)
{
  nsIScriptSecurityManager* secMan = nsContentUtils::GetSecurityManager();
  NS_ENSURE_TRUE(secMan, NS_ERROR_FAILURE);

  return secMan->GetNoAppCodebasePrincipal(aURI, aPrincipal);
}

nsresult
GetPrincipal(const nsACString& aHost, nsIPrincipal** aPrincipal)
{
  return GetPrincipal(aHost, nsIScriptSecurityManager::NO_APP_ID, false, aPrincipal);
}

nsresult
GetHostForPrincipal(nsIPrincipal* aPrincipal, nsACString& aHost)
{
  nsCOMPtr<nsIURI> uri;
  nsresult rv = aPrincipal->GetURI(getter_AddRefs(uri));
  NS_ENSURE_SUCCESS(rv, rv);

  uri = NS_GetInnermostURI(uri);
  NS_ENSURE_TRUE(uri, NS_ERROR_FAILURE);

  rv = uri->GetAsciiHost(aHost);
  if (NS_SUCCEEDED(rv) && !aHost.IsEmpty()) {
    return NS_OK;
  }

  // For the mailto scheme, we use the path of the URI. We have to chop off the
  // query part if one exists, so we eliminate everything after a ?.
  bool isMailTo = false;
  if (NS_SUCCEEDED(uri->SchemeIs("mailto", &isMailTo)) && isMailTo) {
    rv = uri->GetPath(aHost);
    NS_ENSURE_SUCCESS(rv, rv);

    int32_t spart = aHost.FindChar('?', 0);
    if (spart >= 0) {
      aHost.Cut(spart, aHost.Length() - spart);
    }
    return NS_OK;
  }

  // Some entries like "file://" uses the origin.
  rv = aPrincipal->GetOrigin(getter_Copies(aHost));
  if (NS_SUCCEEDED(rv) && !aHost.IsEmpty()) {
    return NS_OK;
  }

  return NS_ERROR_UNEXPECTED;
}

nsCString
GetNextSubDomainForHost(const nsACString& aHost)
{
  nsCOMPtr<nsIEffectiveTLDService> tldService =
    do_GetService(NS_EFFECTIVETLDSERVICE_CONTRACTID);
  if (!tldService) {
    NS_ERROR("Should have a tld service!");
    return EmptyCString();
  }

  nsCString subDomain;
  nsresult rv = tldService->GetNextSubDomain(aHost, subDomain);
  // We can fail if there is no more subdomain or if the host can't have a
  // subdomain.
  if (NS_FAILED(rv)) {
    return EmptyCString();
  }

  return subDomain;
}

class AppClearDataObserver MOZ_FINAL : public nsIObserver {
public:
  NS_DECL_ISUPPORTS

  // nsIObserver implementation.
  NS_IMETHODIMP
  Observe(nsISupports *aSubject, const char *aTopic, const PRUnichar *data)
  {
    MOZ_ASSERT(!nsCRT::strcmp(aTopic, "webapps-clear-data"));

    nsCOMPtr<mozIApplicationClearPrivateDataParams> params =
      do_QueryInterface(aSubject);
    if (!params) {
      NS_ERROR("'webapps-clear-data' notification's subject should be a mozIApplicationClearPrivateDataParams");
      return NS_ERROR_UNEXPECTED;
    }

    uint32_t appId;
    nsresult rv = params->GetAppId(&appId);
    NS_ENSURE_SUCCESS(rv, rv);

    bool browserOnly;
    rv = params->GetBrowserOnly(&browserOnly);
    NS_ENSURE_SUCCESS(rv, rv);

    nsCOMPtr<nsIPermissionManager> permManager = do_GetService("@mozilla.org/permissionmanager;1");
    return permManager->RemovePermissionsForApp(appId, browserOnly);
  }
};

NS_IMPL_ISUPPORTS1(AppClearDataObserver, nsIObserver)

} // anonymous namespace

////////////////////////////////////////////////////////////////////////////////

nsPermissionManager::PermissionKey::PermissionKey(nsIPrincipal* aPrincipal)
{
  MOZ_ALWAYS_TRUE(NS_SUCCEEDED(GetHostForPrincipal(aPrincipal, mHost)));
  MOZ_ALWAYS_TRUE(NS_SUCCEEDED(aPrincipal->GetAppId(&mAppId)));
  MOZ_ALWAYS_TRUE(NS_SUCCEEDED(aPrincipal->GetIsInBrowserElement(&mIsInBrowserElement)));
}

/**
 * Simple callback used by |AsyncClose| to trigger a treatment once
 * the database is closed.
 *
 * Note: Beware that, if you hold onto a |CloseDatabaseListener| from a
 * |nsPermissionManager|, this will create a cycle.
 *
 * Note: Once the callback has been called this DeleteFromMozHostListener cannot
 * be reused.
 */
class CloseDatabaseListener MOZ_FINAL : public mozIStorageCompletionCallback
{
public:
  NS_DECL_ISUPPORTS
  NS_DECL_MOZISTORAGECOMPLETIONCALLBACK
  /**
   * @param aManager The owning manager.
   * @param aRebuildOnSuccess If |true|, reinitialize the database once
   * it has been closed. Otherwise, do nothing such.
   */
  CloseDatabaseListener(nsPermissionManager* aManager,
                        bool aRebuildOnSuccess);

protected:
  nsRefPtr<nsPermissionManager> mManager;
  bool mRebuildOnSuccess;
};

NS_IMPL_ISUPPORTS1(CloseDatabaseListener, mozIStorageCompletionCallback)

CloseDatabaseListener::CloseDatabaseListener(nsPermissionManager* aManager,
                                             bool aRebuildOnSuccess)
  : mManager(aManager)
  , mRebuildOnSuccess(aRebuildOnSuccess)
{
}

NS_IMETHODIMP
CloseDatabaseListener::Complete(nsresult, nsISupports*)
{
  // Help breaking cycles
  nsRefPtr<nsPermissionManager> manager = mManager.forget();
  if (mRebuildOnSuccess && !manager->mIsShuttingDown) {
    return manager->InitDB(true);
  }
  return NS_OK;
}


/**
 * Simple callback used by |RemoveAllInternal| to trigger closing
 * the database and reinitializing it.
 *
 * Note: Beware that, if you hold onto a |DeleteFromMozHostListener| from a
 * |nsPermissionManager|, this will create a cycle.
 *
 * Note: Once the callback has been called this DeleteFromMozHostListener cannot
 * be reused.
 */
class DeleteFromMozHostListener MOZ_FINAL : public mozIStorageStatementCallback
{
public:
  NS_DECL_ISUPPORTS
  NS_DECL_MOZISTORAGESTATEMENTCALLBACK

  /**
   * @param aManager The owning manager.
   */
  DeleteFromMozHostListener(nsPermissionManager* aManager);

protected:
  nsRefPtr<nsPermissionManager> mManager;
};

NS_IMPL_ISUPPORTS1(DeleteFromMozHostListener, mozIStorageStatementCallback)

DeleteFromMozHostListener::
DeleteFromMozHostListener(nsPermissionManager* aManager)
  : mManager(aManager)
{
}

NS_IMETHODIMP DeleteFromMozHostListener::HandleResult(mozIStorageResultSet *)
{
  MOZ_CRASH("Should not get any results");
}

NS_IMETHODIMP DeleteFromMozHostListener::HandleError(mozIStorageError *)
{
  // Errors are handled in |HandleCompletion|
  return NS_OK;
}

NS_IMETHODIMP DeleteFromMozHostListener::HandleCompletion(uint16_t aReason)
{
  // Help breaking cycles
  nsRefPtr<nsPermissionManager> manager = mManager.forget();

  if (aReason == REASON_ERROR) {
    manager->CloseDB(true);
  }

  return NS_OK;
}

/* static */ void
nsPermissionManager::AppClearDataObserverInit()
{
  nsCOMPtr<nsIObserverService> observerService = do_GetService("@mozilla.org/observer-service;1");
  observerService->AddObserver(new AppClearDataObserver(), "webapps-clear-data", /* holdsWeak= */ false);
}

////////////////////////////////////////////////////////////////////////////////
// nsPermissionManager Implementation

static const char kPermissionsFileName[] = "permissions.sqlite";
#define HOSTS_SCHEMA_VERSION 3

static const char kHostpermFileName[] = "hostperm.1";

static const char kPermissionChangeNotification[] = PERM_CHANGE_NOTIFICATION;

NS_IMPL_ISUPPORTS3(nsPermissionManager, nsIPermissionManager, nsIObserver, nsISupportsWeakReference)

nsPermissionManager::nsPermissionManager()
 : mLargestID(0)
 , mIsShuttingDown(false)
{
}

nsPermissionManager::~nsPermissionManager()
{
  RemoveAllFromMemory();
  gPermissionManager = nullptr;
}

// static
nsIPermissionManager*
nsPermissionManager::GetXPCOMSingleton()
{
  if (gPermissionManager) {
    NS_ADDREF(gPermissionManager);
    return gPermissionManager;
  }

  // Create a new singleton nsPermissionManager.
  // We AddRef only once since XPCOM has rules about the ordering of module
  // teardowns - by the time our module destructor is called, it's too late to
  // Release our members, since GC cycles have already been completed and
  // would result in serious leaks.
  // See bug 209571.
  gPermissionManager = new nsPermissionManager();
  if (gPermissionManager) {
    NS_ADDREF(gPermissionManager);
    if (NS_FAILED(gPermissionManager->Init())) {
      NS_RELEASE(gPermissionManager);
    }
  }

  return gPermissionManager;
}

nsresult
nsPermissionManager::Init()
{
  nsresult rv;

  mObserverService = do_GetService("@mozilla.org/observer-service;1", &rv);
  if (NS_SUCCEEDED(rv)) {
    mObserverService->AddObserver(this, "profile-before-change", true);
    mObserverService->AddObserver(this, "profile-do-change", true);
  }

  if (IsChildProcess()) {
    // Get the permissions from the parent process
    InfallibleTArray<IPC::Permission> perms;
    ChildProcess()->SendReadPermissions(&perms);

    for (uint32_t i = 0; i < perms.Length(); i++) {
      const IPC::Permission &perm = perms[i];

      nsCOMPtr<nsIPrincipal> principal;
      rv = GetPrincipal(perm.host, perm.appId, perm.isInBrowserElement, getter_AddRefs(principal));
      NS_ENSURE_SUCCESS(rv, rv);

      AddInternal(principal, perm.type, perm.capability, 0, perm.expireType,
                  perm.expireTime, eNotify, eNoDBOperation);
    }

    // Stop here; we don't need the DB in the child process
    return NS_OK;
  }

  // ignore failure here, since it's non-fatal (we can run fine without
  // persistent storage - e.g. if there's no profile).
  // XXX should we tell the user about this?
  InitDB(false);

  return NS_OK;
}

nsresult
nsPermissionManager::InitDB(bool aRemoveFile)
{
  nsCOMPtr<nsIFile> permissionsFile;
  nsresult rv = NS_GetSpecialDirectory(NS_APP_PERMISSION_PARENT_DIR, getter_AddRefs(permissionsFile));
  if (NS_FAILED(rv)) {
    rv = NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR, getter_AddRefs(permissionsFile));
  }
  NS_ENSURE_SUCCESS(rv, NS_ERROR_UNEXPECTED);

  rv = permissionsFile->AppendNative(NS_LITERAL_CSTRING(kPermissionsFileName));
  NS_ENSURE_SUCCESS(rv, rv);

  if (aRemoveFile) {
    bool exists = false;
    rv = permissionsFile->Exists(&exists);
    NS_ENSURE_SUCCESS(rv, rv);
    if (exists) {
      rv = permissionsFile->Remove(false);
      NS_ENSURE_SUCCESS(rv, rv);
    }
  }

  nsCOMPtr<mozIStorageService> storage = do_GetService(MOZ_STORAGE_SERVICE_CONTRACTID);
  if (!storage)
    return NS_ERROR_UNEXPECTED;

  // cache a connection to the hosts database
  rv = storage->OpenDatabase(permissionsFile, getter_AddRefs(mDBConn));
  NS_ENSURE_SUCCESS(rv, rv);

  bool ready;
  mDBConn->GetConnectionReady(&ready);
  if (!ready) {
    // delete and try again
    rv = permissionsFile->Remove(false);
    NS_ENSURE_SUCCESS(rv, rv);

    rv = storage->OpenDatabase(permissionsFile, getter_AddRefs(mDBConn));
    NS_ENSURE_SUCCESS(rv, rv);

    mDBConn->GetConnectionReady(&ready);
    if (!ready)
      return NS_ERROR_UNEXPECTED;
  }

  bool tableExists = false;
  mDBConn->TableExists(NS_LITERAL_CSTRING("moz_hosts"), &tableExists);
  if (!tableExists) {
    rv = CreateTable();
    NS_ENSURE_SUCCESS(rv, rv);

  } else {
    // table already exists; check the schema version before reading
    int32_t dbSchemaVersion;
    rv = mDBConn->GetSchemaVersion(&dbSchemaVersion);
    NS_ENSURE_SUCCESS(rv, rv);

    switch (dbSchemaVersion) {
    // upgrading.
    // every time you increment the database schema, you need to implement
    // the upgrading code from the previous version to the new one.
    // fall through to current version

    case 1:
      {
        // previous non-expiry version of database.  Upgrade it by adding the
        // expiration columns
        rv = mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
              "ALTER TABLE moz_hosts ADD expireType INTEGER"));
        NS_ENSURE_SUCCESS(rv, rv);

        rv = mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
              "ALTER TABLE moz_hosts ADD expireTime INTEGER"));
        NS_ENSURE_SUCCESS(rv, rv);
      }

      // fall through to the next upgrade

    // TODO: we want to make default version as version 2 in order to fix bug 784875.
    case 0:
    case 2:
      {
        // Add appId/isInBrowserElement fields.
        rv = mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
              "ALTER TABLE moz_hosts ADD appId INTEGER"));
        NS_ENSURE_SUCCESS(rv, rv);

        rv = mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
              "ALTER TABLE moz_hosts ADD isInBrowserElement INTEGER"));
        NS_ENSURE_SUCCESS(rv, rv);

        rv = mDBConn->SetSchemaVersion(HOSTS_SCHEMA_VERSION);
        NS_ENSURE_SUCCESS(rv, rv);
      }

      // fall through to the next upgrade

    // current version.
    case HOSTS_SCHEMA_VERSION:
      break;

    // downgrading.
    // if columns have been added to the table, we can still use the ones we
    // understand safely. if columns have been deleted or altered, just
    // blow away the table and start from scratch! if you change the way
    // a column is interpreted, make sure you also change its name so this
    // check will catch it.
    default:
      {
        // check if all the expected columns exist
        nsCOMPtr<mozIStorageStatement> stmt;
        rv = mDBConn->CreateStatement(NS_LITERAL_CSTRING(
          "SELECT host, type, permission, expireType, expireTime, appId, isInBrowserElement FROM moz_hosts"),
          getter_AddRefs(stmt));
        if (NS_SUCCEEDED(rv))
          break;

        // our columns aren't there - drop the table!
        rv = mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING("DROP TABLE moz_hosts"));
        NS_ENSURE_SUCCESS(rv, rv);

        rv = CreateTable();
        NS_ENSURE_SUCCESS(rv, rv);
      }
      break;
    }
  }

  // make operations on the table asynchronous, for performance
  mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING("PRAGMA synchronous = OFF"));

  // cache frequently used statements (for insertion, deletion, and updating)
  rv = mDBConn->CreateAsyncStatement(NS_LITERAL_CSTRING(
    "INSERT INTO moz_hosts "
    "(id, host, type, permission, expireType, expireTime, appId, isInBrowserElement) "
    "VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8)"), getter_AddRefs(mStmtInsert));
  NS_ENSURE_SUCCESS(rv, rv);

  rv = mDBConn->CreateAsyncStatement(NS_LITERAL_CSTRING(
    "DELETE FROM moz_hosts "
    "WHERE id = ?1"), getter_AddRefs(mStmtDelete));
  NS_ENSURE_SUCCESS(rv, rv);

  rv = mDBConn->CreateAsyncStatement(NS_LITERAL_CSTRING(
    "UPDATE moz_hosts "
    "SET permission = ?2, expireType= ?3, expireTime = ?4 WHERE id = ?1"),
    getter_AddRefs(mStmtUpdate));
  NS_ENSURE_SUCCESS(rv, rv);

  // check whether to import or just read in the db
  if (tableExists)
    return Read();

  return Import();
}

// sets the schema version and creates the moz_hosts table.
nsresult
nsPermissionManager::CreateTable()
{
  // set the schema version, before creating the table
  nsresult rv = mDBConn->SetSchemaVersion(HOSTS_SCHEMA_VERSION);
  if (NS_FAILED(rv)) return rv;

  // create the table
  // SQL also lives in automation.py.in. If you change this SQL change that
  // one too.
  return mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
    "CREATE TABLE moz_hosts ("
      " id INTEGER PRIMARY KEY"
      ",host TEXT"
      ",type TEXT"
      ",permission INTEGER"
      ",expireType INTEGER"
      ",expireTime INTEGER"
      ",appId INTEGER"
      ",isInBrowserElement INTEGER"
    ")"));
}

NS_IMETHODIMP
nsPermissionManager::Add(nsIURI     *aURI,
                         const char *aType,
                         uint32_t    aPermission,
                         uint32_t    aExpireType,
                         int64_t     aExpireTime)
{
  NS_ENSURE_ARG_POINTER(aURI);

  nsCOMPtr<nsIPrincipal> principal;
  nsresult rv = GetPrincipal(aURI, getter_AddRefs(principal));
  NS_ENSURE_SUCCESS(rv, rv);

  return AddFromPrincipal(principal, aType, aPermission, aExpireType, aExpireTime);
}

NS_IMETHODIMP
nsPermissionManager::AddFromPrincipal(nsIPrincipal* aPrincipal,
                                      const char* aType, uint32_t aPermission,
                                      uint32_t aExpireType, int64_t aExpireTime)
{
  ENSURE_NOT_CHILD_PROCESS;
  NS_ENSURE_ARG_POINTER(aPrincipal);
  NS_ENSURE_ARG_POINTER(aType);
  NS_ENSURE_TRUE(aExpireType == nsIPermissionManager::EXPIRE_NEVER ||
                 aExpireType == nsIPermissionManager::EXPIRE_TIME ||
                 aExpireType == nsIPermissionManager::EXPIRE_SESSION,
                 NS_ERROR_INVALID_ARG);

  // Skip addition if the permission is already expired. Note that EXPIRE_SESSION only
  // honors expireTime if it is nonzero.
  if ((aExpireType == nsIPermissionManager::EXPIRE_TIME ||
       (aExpireType == nsIPermissionManager::EXPIRE_SESSION && aExpireTime != 0)) &&
      aExpireTime <= (PR_Now() / 1000)) {
    return NS_OK;
  }

  // We don't add the system principal because it actually has no URI and we
  // always allow action for them.
  if (nsContentUtils::IsSystemPrincipal(aPrincipal)) {
    return NS_OK;
  }

  return AddInternal(aPrincipal, nsDependentCString(aType), aPermission, 0,
                     aExpireType, aExpireTime, eNotify, eWriteToDB);
}

nsresult
nsPermissionManager::AddInternal(nsIPrincipal* aPrincipal,
                                 const nsAFlatCString &aType,
                                 uint32_t              aPermission,
                                 int64_t               aID,
                                 uint32_t              aExpireType,
                                 int64_t               aExpireTime,
                                 NotifyOperationType   aNotifyOperation,
                                 DBOperationType       aDBOperation)
{
  nsAutoCString host;
  nsresult rv = GetHostForPrincipal(aPrincipal, host);
  NS_ENSURE_SUCCESS(rv, rv);

  if (!IsChildProcess()) {
    uint32_t appId;
    rv = aPrincipal->GetAppId(&appId);
    NS_ENSURE_SUCCESS(rv, rv);

    bool isInBrowserElement;
    rv = aPrincipal->GetIsInBrowserElement(&isInBrowserElement);
    NS_ENSURE_SUCCESS(rv, rv);

    IPC::Permission permission(host, appId, isInBrowserElement, aType,
                               aPermission, aExpireType, aExpireTime);

    nsTArray<ContentParent*> cplist;
    ContentParent::GetAll(cplist);
    for (uint32_t i = 0; i < cplist.Length(); ++i) {
      ContentParent* cp = cplist[i];
      if (cp->NeedsPermissionsUpdate())
        unused << cp->SendAddPermission(permission);
    }
  }

  // look up the type index
  int32_t typeIndex = GetTypeIndex(aType.get(), true);
  NS_ENSURE_TRUE(typeIndex != -1, NS_ERROR_OUT_OF_MEMORY);

  // When an entry already exists, PutEntry will return that, instead
  // of adding a new one
  nsRefPtr<PermissionKey> key = new PermissionKey(aPrincipal);
  PermissionHashKey* entry = mPermissionTable.PutEntry(key);
  if (!entry) return NS_ERROR_FAILURE;
  if (!entry->GetKey()) {
    mPermissionTable.RawRemoveEntry(entry);
    return NS_ERROR_OUT_OF_MEMORY;
  }

  // figure out the transaction type, and get any existing permission value
  OperationType op;
  int32_t index = entry->GetPermissionIndex(typeIndex);
  if (index == -1) {
    if (aPermission == nsIPermissionManager::UNKNOWN_ACTION)
      op = eOperationNone;
    else
      op = eOperationAdding;

  } else {
    PermissionEntry oldPermissionEntry = entry->GetPermissions()[index];

    // remove the permission if the permission is UNKNOWN, update the
    // permission if its value or expire type have changed OR if the time has
    // changed and the expire type is time, otherwise, don't modify.  There's
    // no need to modify a permission that doesn't expire with time when the
    // only thing changed is the expire time.
    if (aPermission == oldPermissionEntry.mPermission &&
        aExpireType == oldPermissionEntry.mExpireType &&
        (aExpireType == nsIPermissionManager::EXPIRE_NEVER ||
         aExpireTime == oldPermissionEntry.mExpireTime))
      op = eOperationNone;
    else if (aPermission == nsIPermissionManager::UNKNOWN_ACTION)
      op = eOperationRemoving;
    else
      op = eOperationChanging;
  }

  // do the work for adding, deleting, or changing a permission:
  // update the in-memory list, write to the db, and notify consumers.
  int64_t id;
  switch (op) {
  case eOperationNone:
    {
      // nothing to do
      return NS_OK;
    }

  case eOperationAdding:
    {
      if (aDBOperation == eWriteToDB) {
        // we'll be writing to the database - generate a known unique id
        id = ++mLargestID;
      } else {
        // we're reading from the database - use the id already assigned
        id = aID;
      }

      entry->GetPermissions().AppendElement(PermissionEntry(id, typeIndex, aPermission, aExpireType, aExpireTime));

      if (aDBOperation == eWriteToDB && aExpireType != nsIPermissionManager::EXPIRE_SESSION) {
        uint32_t appId;
        rv = aPrincipal->GetAppId(&appId);
        NS_ENSURE_SUCCESS(rv, rv);

        bool isInBrowserElement;
        rv = aPrincipal->GetIsInBrowserElement(&isInBrowserElement);
        NS_ENSURE_SUCCESS(rv, rv);

        UpdateDB(op, mStmtInsert, id, host, aType, aPermission, aExpireType, aExpireTime, appId, isInBrowserElement);
      }

      if (aNotifyOperation == eNotify) {
        NotifyObserversWithPermission(host,
                                      entry->GetKey()->mAppId,
                                      entry->GetKey()->mIsInBrowserElement,
                                      mTypeArray[typeIndex],
                                      aPermission,
                                      aExpireType,
                                      aExpireTime,
                                      NS_LITERAL_STRING("added").get());
      }

      break;
    }

  case eOperationRemoving:
    {
      PermissionEntry oldPermissionEntry = entry->GetPermissions()[index];
      id = oldPermissionEntry.mID;
      entry->GetPermissions().RemoveElementAt(index);

      if (aDBOperation == eWriteToDB)
        // We care only about the id here so we pass dummy values for all other
        // parameters.
        UpdateDB(op, mStmtDelete, id, EmptyCString(), EmptyCString(), 0,
                 nsIPermissionManager::EXPIRE_NEVER, 0, 0, false);

      if (aNotifyOperation == eNotify) {
        NotifyObserversWithPermission(host,
                                      entry->GetKey()->mAppId,
                                      entry->GetKey()->mIsInBrowserElement,
                                      mTypeArray[typeIndex],
                                      oldPermissionEntry.mPermission,
                                      oldPermissionEntry.mExpireType,
                                      oldPermissionEntry.mExpireTime,
                                      NS_LITERAL_STRING("deleted").get());
      }

      // If there are no more permissions stored for that entry, clear it.
      if (entry->GetPermissions().IsEmpty()) {
        mPermissionTable.RawRemoveEntry(entry);
      }

      break;
    }

  case eOperationChanging:
    {
      id = entry->GetPermissions()[index].mID;

      // If the new expireType is EXPIRE_SESSION, then we have to keep a
      // copy of the previous permission/expireType values. This cached value will be
      // used when restoring the permissions of an app.
      if (entry->GetPermissions()[index].mExpireType != nsIPermissionManager::EXPIRE_SESSION &&
          aExpireType == nsIPermissionManager::EXPIRE_SESSION) {
        entry->GetPermissions()[index].mNonSessionPermission = entry->GetPermissions()[index].mPermission;
        entry->GetPermissions()[index].mNonSessionExpireType = entry->GetPermissions()[index].mExpireType;
        entry->GetPermissions()[index].mNonSessionExpireTime = entry->GetPermissions()[index].mExpireTime;
      } else if (aExpireType != nsIPermissionManager::EXPIRE_SESSION) {
        entry->GetPermissions()[index].mNonSessionPermission = aPermission;
        entry->GetPermissions()[index].mNonSessionExpireType = aExpireType;
        entry->GetPermissions()[index].mNonSessionExpireTime = aExpireTime;
      }

      entry->GetPermissions()[index].mPermission = aPermission;
      entry->GetPermissions()[index].mExpireType = aExpireType;
      entry->GetPermissions()[index].mExpireTime = aExpireTime;

      if (aDBOperation == eWriteToDB && aExpireType != nsIPermissionManager::EXPIRE_SESSION)
        // We care only about the id, the permission and expireType/expireTime here.
        // We pass dummy values for all other parameters.
        UpdateDB(op, mStmtUpdate, id, EmptyCString(), EmptyCString(),
                 aPermission, aExpireType, aExpireTime, 0, false);

      if (aNotifyOperation == eNotify) {
        NotifyObserversWithPermission(host,
                                      entry->GetKey()->mAppId,
                                      entry->GetKey()->mIsInBrowserElement,
                                      mTypeArray[typeIndex],
                                      aPermission,
                                      aExpireType,
                                      aExpireTime,
                                      NS_LITERAL_STRING("changed").get());
      }

      break;
    }
  }

  return NS_OK;
}

NS_IMETHODIMP
nsPermissionManager::Remove(const nsACString &aHost,
                            const char       *aType)
{
  nsCOMPtr<nsIPrincipal> principal;
  nsresult rv = GetPrincipal(aHost, getter_AddRefs(principal));
  NS_ENSURE_SUCCESS(rv, rv);

  return RemoveFromPrincipal(principal, aType);
}

NS_IMETHODIMP
nsPermissionManager::RemoveFromPrincipal(nsIPrincipal* aPrincipal,
                                         const char* aType)
{
  ENSURE_NOT_CHILD_PROCESS;
  NS_ENSURE_ARG_POINTER(aPrincipal);
  NS_ENSURE_ARG_POINTER(aType);

  // System principals are never added to the database, no need to remove them.
  if (nsContentUtils::IsSystemPrincipal(aPrincipal)) {
    return NS_OK;
  }

  // AddInternal() handles removal, just let it do the work
  return AddInternal(aPrincipal,
                     nsDependentCString(aType),
                     nsIPermissionManager::UNKNOWN_ACTION,
                     0,
                     nsIPermissionManager::EXPIRE_NEVER,
                     0,
                     eNotify,
                     eWriteToDB);
}

NS_IMETHODIMP
nsPermissionManager::RemoveAll()
{
  ENSURE_NOT_CHILD_PROCESS;
  return RemoveAllInternal(true);
}

void
nsPermissionManager::CloseDB(bool aRebuildOnSuccess)
{
  // Null the statements, this will finalize them.
  mStmtInsert = nullptr;
  mStmtDelete = nullptr;
  mStmtUpdate = nullptr;
  if (mDBConn) {
    mozIStorageCompletionCallback* cb = new CloseDatabaseListener(this,
           aRebuildOnSuccess);
    mozilla::DebugOnly<nsresult> rv = mDBConn->AsyncClose(cb);
    MOZ_ASSERT(NS_SUCCEEDED(rv));
    mDBConn = nullptr; // Avoid race conditions
  }
}

nsresult
nsPermissionManager::RemoveAllInternal(bool aNotifyObservers)
{
  // Remove from memory and notify immediately. Since the in-memory
  // database is authoritative, we do not need confirmation from the
  // on-disk database to notify observers.
  RemoveAllFromMemory();
  if (aNotifyObservers) {
    NotifyObservers(nullptr, NS_LITERAL_STRING("cleared").get());
  }

  // clear the db
  if (mDBConn) {
    nsCOMPtr<mozIStorageAsyncStatement> removeStmt;
    nsresult rv = mDBConn->
      CreateAsyncStatement(NS_LITERAL_CSTRING(
         "DELETE FROM moz_hosts"
      ), getter_AddRefs(removeStmt));
    MOZ_ASSERT(NS_SUCCEEDED(rv));
    if (!removeStmt) {
      return NS_ERROR_UNEXPECTED;
    }
    nsCOMPtr<mozIStoragePendingStatement> pending;
    mozIStorageStatementCallback* cb = new DeleteFromMozHostListener(this);
    rv = removeStmt->ExecuteAsync(cb, getter_AddRefs(pending));
    MOZ_ASSERT(NS_SUCCEEDED(rv));

    return rv;
  }

  return NS_OK;
}

NS_IMETHODIMP
nsPermissionManager::TestExactPermission(nsIURI     *aURI,
                                         const char *aType,
                                         uint32_t   *aPermission)
{
  nsCOMPtr<nsIPrincipal> principal;
  nsresult rv = GetPrincipal(aURI, getter_AddRefs(principal));
  NS_ENSURE_SUCCESS(rv, rv);

  return TestExactPermissionFromPrincipal(principal, aType, aPermission);
}

NS_IMETHODIMP
nsPermissionManager::TestExactPermissionFromPrincipal(nsIPrincipal* aPrincipal,
                                                      const char* aType,
                                                      uint32_t* aPermission)
{
  NS_ENSURE_ARG_POINTER(aPrincipal);

  if (nsContentUtils::IsSystemPrincipal(aPrincipal)) {
    *aPermission = nsIPermissionManager::ALLOW_ACTION;
    return NS_OK;
  }

  return CommonTestPermission(aPrincipal, aType, aPermission, true, true);
}

NS_IMETHODIMP
nsPermissionManager::TestExactPermanentPermission(nsIPrincipal* aPrincipal,
                                                  const char* aType,
                                                  uint32_t* aPermission)
{
  NS_ENSURE_ARG_POINTER(aPrincipal);

  // System principals do not have URI so we can't try to get
  // retro-compatibility here.
  if (nsContentUtils::IsSystemPrincipal(aPrincipal)) {
    *aPermission = nsIPermissionManager::ALLOW_ACTION;
    return NS_OK;
  }

  return CommonTestPermission(aPrincipal, aType, aPermission, true, false);
}

NS_IMETHODIMP
nsPermissionManager::TestPermission(nsIURI     *aURI,
                                    const char *aType,
                                    uint32_t   *aPermission)
{
  nsCOMPtr<nsIPrincipal> principal;
  nsresult rv = GetPrincipal(aURI, getter_AddRefs(principal));
  NS_ENSURE_SUCCESS(rv, rv);

  return TestPermissionFromPrincipal(principal, aType, aPermission);
}

NS_IMETHODIMP
nsPermissionManager::TestPermissionFromWindow(nsIDOMWindow* aWindow,
                                              const char* aType,
                                              uint32_t* aPermission)
{
  nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(aWindow);
  NS_ENSURE_TRUE(window, NS_NOINTERFACE);

  nsPIDOMWindow* innerWindow = window->IsInnerWindow() ?
    window.get() :
    window->GetCurrentInnerWindow();

  // Get the document for security check
  nsCOMPtr<nsIDocument> document = innerWindow->GetExtantDoc();
  NS_ENSURE_TRUE(document, NS_NOINTERFACE);

  nsCOMPtr<nsIPrincipal> principal = document->NodePrincipal();
  return TestPermissionFromPrincipal(principal, aType, aPermission);
}

NS_IMETHODIMP
nsPermissionManager::TestPermissionFromPrincipal(nsIPrincipal* aPrincipal,
                                                 const char* aType,
                                                 uint32_t* aPermission)
{
  NS_ENSURE_ARG_POINTER(aPrincipal);

  // System principals do not have URI so we can't try to get
  // retro-compatibility here.
  if (nsContentUtils::IsSystemPrincipal(aPrincipal)) {
    *aPermission = nsIPermissionManager::ALLOW_ACTION;
    return NS_OK;
  }

  return CommonTestPermission(aPrincipal, aType, aPermission, false, true);
}

NS_IMETHODIMP
nsPermissionManager::GetPermissionObject(nsIPrincipal* aPrincipal,
                                         const char* aType,
                                         bool aExactHostMatch,
                                         nsIPermission** aResult)
{
  NS_ENSURE_ARG_POINTER(aPrincipal);
  NS_ENSURE_ARG_POINTER(aType);

  *aResult = nullptr;

  if (nsContentUtils::IsSystemPrincipal(aPrincipal)) {
    return NS_OK;
  }

  nsAutoCString host;
  nsresult rv = GetHostForPrincipal(aPrincipal, host);
  NS_ENSURE_SUCCESS(rv, rv);

  int32_t typeIndex = GetTypeIndex(aType, false);
  // If type == -1, the type isn't known,
  // so just return NS_OK
  if (typeIndex == -1) return NS_OK;

  uint32_t appId;
  rv = aPrincipal->GetAppId(&appId);
  NS_ENSURE_SUCCESS(rv, rv);

  bool isInBrowserElement;
  rv = aPrincipal->GetIsInBrowserElement(&isInBrowserElement);
  NS_ENSURE_SUCCESS(rv, rv);

  PermissionHashKey* entry = GetPermissionHashKey(host, appId, isInBrowserElement,
                                                  typeIndex, aExactHostMatch);
  if (!entry) {
    return NS_OK;
  }

  // We don't call GetPermission(typeIndex) because that returns a fake
  // UNKNOWN_ACTION entry if there is no match.
  int32_t idx = entry->GetPermissionIndex(typeIndex);
  if (-1 == idx) {
    return NS_OK;
  }

  PermissionEntry& perm = entry->GetPermissions()[idx];
  nsCOMPtr<nsIPermission> r = new nsPermission(entry->GetKey()->mHost,
                                               entry->GetKey()->mAppId,
                                               entry->GetKey()->mIsInBrowserElement,
                                               mTypeArray.ElementAt(perm.mType),
                                               perm.mPermission,
                                               perm.mExpireType,
                                               perm.mExpireTime);
  r.forget(aResult);
  return NS_OK;
}

nsresult
nsPermissionManager::CommonTestPermission(nsIPrincipal* aPrincipal,
                                          const char *aType,
                                          uint32_t   *aPermission,
                                          bool        aExactHostMatch,
                                          bool        aIncludingSession)
{
  NS_ENSURE_ARG_POINTER(aPrincipal);
  NS_ENSURE_ARG_POINTER(aType);

  // set the default
  *aPermission = nsIPermissionManager::UNKNOWN_ACTION;

  nsAutoCString host;
  nsresult rv = GetHostForPrincipal(aPrincipal, host);
  NS_ENSURE_SUCCESS(rv, rv);

  int32_t typeIndex = GetTypeIndex(aType, false);
  // If type == -1, the type isn't known,
  // so just return NS_OK
  if (typeIndex == -1) return NS_OK;

  uint32_t appId;
  rv = aPrincipal->GetAppId(&appId);
  NS_ENSURE_SUCCESS(rv, rv);

  bool isInBrowserElement;
  rv = aPrincipal->GetIsInBrowserElement(&isInBrowserElement);
  NS_ENSURE_SUCCESS(rv, rv);

  PermissionHashKey* entry = GetPermissionHashKey(host, appId, isInBrowserElement,
                                                  typeIndex, aExactHostMatch);
  if (!entry ||
      (!aIncludingSession &&
       entry->GetPermission(typeIndex).mNonSessionExpireType ==
         nsIPermissionManager::EXPIRE_SESSION)) {
    return NS_OK;
  }

  *aPermission = aIncludingSession
                   ? entry->GetPermission(typeIndex).mPermission
                   : entry->GetPermission(typeIndex).mNonSessionPermission;

  return NS_OK;
}

// Returns PermissionHashKey for a given { host, appId, isInBrowserElement } tuple.
// This is not simply using PermissionKey because we will walk-up domains in
// case of |host| contains sub-domains.
// Returns null if nothing found.
// Also accepts host on the format "<foo>". This will perform an exact match
// lookup as the string doesn't contain any dots.
nsPermissionManager::PermissionHashKey*
nsPermissionManager::GetPermissionHashKey(const nsACString& aHost,
                                          uint32_t aAppId,
                                          bool aIsInBrowserElement,
                                          uint32_t aType,
                                          bool aExactHostMatch)
{
  PermissionHashKey* entry = nullptr;

  nsRefPtr<PermissionKey> key = new PermissionKey(aHost, aAppId, aIsInBrowserElement);
  entry = mPermissionTable.GetEntry(key);

  if (entry) {
    PermissionEntry permEntry = entry->GetPermission(aType);

    // if the entry is expired, remove and keep looking for others.
    // Note that EXPIRE_SESSION only honors expireTime if it is nonzero.
    if ((permEntry.mExpireType == nsIPermissionManager::EXPIRE_TIME ||
         (permEntry.mExpireType == nsIPermissionManager::EXPIRE_SESSION &&
          permEntry.mExpireTime != 0)) &&
        permEntry.mExpireTime <= (PR_Now() / 1000)) {
      nsCOMPtr<nsIPrincipal> principal;
      if (NS_FAILED(GetPrincipal(aHost, aAppId, aIsInBrowserElement, getter_AddRefs(principal)))) {
        return nullptr;
      }

      entry = nullptr;
      RemoveFromPrincipal(principal, mTypeArray[aType].get());
    } else if (permEntry.mPermission == nsIPermissionManager::UNKNOWN_ACTION) {
      entry = nullptr;
    }
  }

  if (entry) {
    return entry;
  }

  // If we haven't found an entry, depending on the host, we could try a bit
  // harder.
  // If this is a file:// URI, we can check for the presence of the magic entry
  // <file> which gives permission to all file://. This hack might disappear,
  // see bug 817007. Note that we don't require aExactHostMatch to be true for
  // that to keep retro-compatibility.
  // If this is not a file:// URI, and that aExactHostMatch wasn't true, we can
  // check if the base domain has a permission entry.

  if (StringBeginsWith(aHost, NS_LITERAL_CSTRING("file://"))) {
    return GetPermissionHashKey(NS_LITERAL_CSTRING("<file>"), aAppId, aIsInBrowserElement, aType, true);
  }

  if (!aExactHostMatch) {
    nsCString domain = GetNextSubDomainForHost(aHost);
    if (!domain.IsEmpty()) {
      return GetPermissionHashKey(domain, aAppId, aIsInBrowserElement, aType, aExactHostMatch);
    }
  }

  // No entry, really...
  return nullptr;
}

// helper struct for passing arguments into hash enumeration callback.
struct nsGetEnumeratorData
{
  nsGetEnumeratorData(nsCOMArray<nsIPermission> *aArray, const nsTArray<nsCString> *aTypes)
   : array(aArray)
   , types(aTypes) {}

  nsCOMArray<nsIPermission> *array;
  const nsTArray<nsCString> *types;
};

static PLDHashOperator
AddPermissionsToList(nsPermissionManager::PermissionHashKey* entry, void *arg)
{
  nsGetEnumeratorData *data = static_cast<nsGetEnumeratorData *>(arg);

  for (uint32_t i = 0; i < entry->GetPermissions().Length(); ++i) {
    nsPermissionManager::PermissionEntry& permEntry = entry->GetPermissions()[i];

    nsPermission *perm = new nsPermission(entry->GetKey()->mHost,
                                          entry->GetKey()->mAppId,
                                          entry->GetKey()->mIsInBrowserElement,
                                          data->types->ElementAt(permEntry.mType),
                                          permEntry.mPermission,
                                          permEntry.mExpireType,
                                          permEntry.mExpireTime);

    data->array->AppendObject(perm);
  }

  return PL_DHASH_NEXT;
}

NS_IMETHODIMP nsPermissionManager::GetEnumerator(nsISimpleEnumerator **aEnum)
{
  // roll an nsCOMArray of all our permissions, then hand out an enumerator
  nsCOMArray<nsIPermission> array;
  nsGetEnumeratorData data(&array, &mTypeArray);

  mPermissionTable.EnumerateEntries(AddPermissionsToList, &data);

  return NS_NewArrayEnumerator(aEnum, array);
}

NS_IMETHODIMP nsPermissionManager::Observe(nsISupports *aSubject, const char *aTopic, const PRUnichar *someData)
{
  ENSURE_NOT_CHILD_PROCESS;

  if (!nsCRT::strcmp(aTopic, "profile-before-change")) {
    // The profile is about to change,
    // or is going away because the application is shutting down.
    mIsShuttingDown = true;
    if (!nsCRT::strcmp(someData, NS_LITERAL_STRING("shutdown-cleanse").get())) {
      // Clear the permissions file and close the db asynchronously
      RemoveAllInternal(false);
    } else {
      RemoveAllFromMemory();
      CloseDB(false);
    }
  }
  else if (!nsCRT::strcmp(aTopic, "profile-do-change")) {
    // the profile has already changed; init the db from the new location
    InitDB(false);
  }

  return NS_OK;
}

PLDHashOperator
nsPermissionManager::GetPermissionsForApp(nsPermissionManager::PermissionHashKey* entry, void* arg)
{
  GetPermissionsForAppStruct* data = static_cast<GetPermissionsForAppStruct*>(arg);

  for (uint32_t i = 0; i < entry->GetPermissions().Length(); ++i) {
    nsPermissionManager::PermissionEntry& permEntry = entry->GetPermissions()[i];

    if (entry->GetKey()->mAppId != data->appId ||
        (data->browserOnly && !entry->GetKey()->mIsInBrowserElement)) {
      continue;
    }

    data->permissions.AppendObject(new nsPermission(entry->GetKey()->mHost,
                                                    entry->GetKey()->mAppId,
                                                    entry->GetKey()->mIsInBrowserElement,
                                                    gPermissionManager->mTypeArray.ElementAt(permEntry.mType),
                                                    permEntry.mPermission,
                                                    permEntry.mExpireType,
                                                    permEntry.mExpireTime));
  }

  return PL_DHASH_NEXT;
}

NS_IMETHODIMP
nsPermissionManager::RemovePermissionsForApp(uint32_t aAppId, bool aBrowserOnly)
{
  ENSURE_NOT_CHILD_PROCESS;
  NS_ENSURE_ARG(aAppId != nsIScriptSecurityManager::NO_APP_ID);

  // We begin by removing all the permissions from the DB.
  // After clearing the DB, we call AddInternal() to make sure that all
  // processes are aware of this change and the representation of the DB in
  // memory is updated.
  // We have to get all permissions associated with an application and then
  // remove those because doing so in EnumerateEntries() would fail because
  // we might happen to actually delete entries from the list.

  nsAutoCString sql;
  sql.AppendLiteral("DELETE FROM moz_hosts WHERE appId=");
  sql.AppendInt(aAppId);

  if (aBrowserOnly) {
    sql.AppendLiteral(" AND isInBrowserElement=1");
  }

  nsCOMPtr<mozIStorageAsyncStatement> removeStmt;
  nsresult rv = mDBConn->CreateAsyncStatement(sql, getter_AddRefs(removeStmt));
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<mozIStoragePendingStatement> pending;
  rv = removeStmt->ExecuteAsync(nullptr, getter_AddRefs(pending));
  NS_ENSURE_SUCCESS(rv, rv);

  GetPermissionsForAppStruct data(aAppId, aBrowserOnly);
  mPermissionTable.EnumerateEntries(GetPermissionsForApp, &data);

  for (int32_t i=0; i<data.permissions.Count(); ++i) {
    nsAutoCString host;
    bool isInBrowserElement;
    nsAutoCString type;

    data.permissions[i]->GetHost(host);
    data.permissions[i]->GetIsInBrowserElement(&isInBrowserElement);
    data.permissions[i]->GetType(type);

    nsCOMPtr<nsIPrincipal> principal;
    if (NS_FAILED(GetPrincipal(host, aAppId, isInBrowserElement,
                               getter_AddRefs(principal)))) {
      NS_ERROR("GetPrincipal() failed!");
      continue;
    }

    AddInternal(principal,
                type,
                nsIPermissionManager::UNKNOWN_ACTION,
                0,
                nsIPermissionManager::EXPIRE_NEVER,
                0,
                nsPermissionManager::eNotify,
                nsPermissionManager::eNoDBOperation);
  }

  return NS_OK;
}

PLDHashOperator
nsPermissionManager::RemoveExpiredPermissionsForAppEnumerator(
  nsPermissionManager::PermissionHashKey* entry, void* arg)
{
  uint32_t* appId = static_cast<uint32_t*>(arg);

  for (uint32_t i = 0; i < entry->GetPermissions().Length(); ++i) {
    if (entry->GetKey()->mAppId != *appId) {
      continue;
    }

    nsPermissionManager::PermissionEntry& permEntry = entry->GetPermissions()[i];
    if (permEntry.mExpireType != nsIPermissionManager::EXPIRE_SESSION) {
      continue;
    }

    if (permEntry.mNonSessionExpireType == nsIPermissionManager::EXPIRE_SESSION) {
      PermissionEntry oldPermissionEntry = entry->GetPermissions()[i];

      entry->GetPermissions().RemoveElementAt(i);

      gPermissionManager->NotifyObserversWithPermission(entry->GetKey()->mHost,
                                                        entry->GetKey()->mAppId,
                                                        entry->GetKey()->mIsInBrowserElement,
                                                        gPermissionManager->mTypeArray.ElementAt(oldPermissionEntry.mType),
                                                        oldPermissionEntry.mPermission,
                                                        oldPermissionEntry.mExpireType,
                                                        oldPermissionEntry.mExpireTime,
                                                        NS_LITERAL_STRING("deleted").get());
      --i;
      continue;
    }

    permEntry.mPermission = permEntry.mNonSessionPermission;
    permEntry.mExpireType = permEntry.mNonSessionExpireType;
    permEntry.mExpireTime = permEntry.mNonSessionExpireTime;

    gPermissionManager->NotifyObserversWithPermission(entry->GetKey()->mHost,
                                                      entry->GetKey()->mAppId,
                                                      entry->GetKey()->mIsInBrowserElement,
                                                      gPermissionManager->mTypeArray.ElementAt(permEntry.mType),
                                                      permEntry.mPermission,
                                                      permEntry.mExpireType,
                                                      permEntry.mExpireTime,
                                                      NS_LITERAL_STRING("changed").get());
  }

  return PL_DHASH_NEXT;
}

nsresult
nsPermissionManager::RemoveExpiredPermissionsForApp(uint32_t aAppId)
{
  ENSURE_NOT_CHILD_PROCESS;

  if (aAppId != nsIScriptSecurityManager::NO_APP_ID) {
    mPermissionTable.EnumerateEntries(RemoveExpiredPermissionsForAppEnumerator, &aAppId);
  }

  return NS_OK;
}

//*****************************************************************************
//*** nsPermissionManager private methods
//*****************************************************************************

nsresult
nsPermissionManager::RemoveAllFromMemory()
{
  mLargestID = 0;
  mTypeArray.Clear();
  mPermissionTable.Clear();

  return NS_OK;
}

// Returns -1 on failure
int32_t
nsPermissionManager::GetTypeIndex(const char *aType,
                                  bool        aAdd)
{
  for (uint32_t i = 0; i < mTypeArray.Length(); ++i)
    if (mTypeArray[i].Equals(aType))
      return i;

  if (!aAdd) {
    // Not found, but that is ok - we were just looking.
    return -1;
  }

  // This type was not registered before.
  // append it to the array, without copy-constructing the string
  nsCString *elem = mTypeArray.AppendElement();
  if (!elem)
    return -1;

  elem->Assign(aType);
  return mTypeArray.Length() - 1;
}

// wrapper function for mangling (host,type,perm,expireType,expireTime)
// set into an nsIPermission.
void
nsPermissionManager::NotifyObserversWithPermission(const nsACString &aHost,
                                                   uint32_t          aAppId,
                                                   bool              aIsInBrowserElement,
                                                   const nsCString  &aType,
                                                   uint32_t          aPermission,
                                                   uint32_t          aExpireType,
                                                   int64_t           aExpireTime,
                                                   const PRUnichar  *aData)
{
  nsCOMPtr<nsIPermission> permission =
    new nsPermission(aHost, aAppId, aIsInBrowserElement, aType, aPermission,
                     aExpireType, aExpireTime);
  if (permission)
    NotifyObservers(permission, aData);
}

// notify observers that the permission list changed. there are four possible
// values for aData:
// "deleted" means a permission was deleted. aPermission is the deleted permission.
// "added"   means a permission was added. aPermission is the added permission.
// "changed" means a permission was altered. aPermission is the new permission.
// "cleared" means the entire permission list was cleared. aPermission is null.
void
nsPermissionManager::NotifyObservers(nsIPermission   *aPermission,
                                     const PRUnichar *aData)
{
  if (mObserverService)
    mObserverService->NotifyObservers(aPermission,
                                      kPermissionChangeNotification,
                                      aData);
}

nsresult
nsPermissionManager::Read()
{
  ENSURE_NOT_CHILD_PROCESS;

  nsresult rv;

  // delete expired permissions before we read in the db
  {
    // this deletion has its own scope so the write lock is released when done.
    nsCOMPtr<mozIStorageStatement> stmtDeleteExpired;
    rv = mDBConn->CreateStatement(NS_LITERAL_CSTRING(
          "DELETE FROM moz_hosts WHERE expireType = ?1 AND expireTime <= ?2"),
          getter_AddRefs(stmtDeleteExpired));
    NS_ENSURE_SUCCESS(rv, rv);

    rv = stmtDeleteExpired->BindInt32ByIndex(0, nsIPermissionManager::EXPIRE_TIME);
    NS_ENSURE_SUCCESS(rv, rv);

    rv = stmtDeleteExpired->BindInt64ByIndex(1, PR_Now() / 1000);
    NS_ENSURE_SUCCESS(rv, rv);

    bool hasResult;
    rv = stmtDeleteExpired->ExecuteStep(&hasResult);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  nsCOMPtr<mozIStorageStatement> stmt;
  rv = mDBConn->CreateStatement(NS_LITERAL_CSTRING(
    "SELECT id, host, type, permission, expireType, expireTime, appId, isInBrowserElement "
    "FROM moz_hosts"), getter_AddRefs(stmt));
  NS_ENSURE_SUCCESS(rv, rv);

  int64_t id;
  nsAutoCString host, type;
  uint32_t permission;
  uint32_t expireType;
  int64_t expireTime;
  uint32_t appId;
  bool isInBrowserElement;
  bool hasResult;
  bool readError = false;

  while (NS_SUCCEEDED(stmt->ExecuteStep(&hasResult)) && hasResult) {
    // explicitly set our entry id counter for use in AddInternal(),
    // and keep track of the largest id so we know where to pick up.
    id = stmt->AsInt64(0);
    if (id > mLargestID)
      mLargestID = id;

    rv = stmt->GetUTF8String(1, host);
    if (NS_FAILED(rv)) {
      readError = true;
      continue;
    }

    rv = stmt->GetUTF8String(2, type);
    if (NS_FAILED(rv)) {
      readError = true;
      continue;
    }

    permission = stmt->AsInt32(3);
    expireType = stmt->AsInt32(4);

    // convert into int64_t value (milliseconds)
    expireTime = stmt->AsInt64(5);

    if (stmt->AsInt64(6) < 0) {
      readError = true;
      continue;
    }
    appId = static_cast<uint32_t>(stmt->AsInt64(6));
    isInBrowserElement = static_cast<bool>(stmt->AsInt32(7));

    nsCOMPtr<nsIPrincipal> principal;
    nsresult rv = GetPrincipal(host, appId, isInBrowserElement, getter_AddRefs(principal));
    if (NS_FAILED(rv)) {
      readError = true;
      continue;
    }

    rv = AddInternal(principal, type, permission, id, expireType, expireTime,
                     eDontNotify, eNoDBOperation);
    if (NS_FAILED(rv)) {
      readError = true;
      continue;
    }
  }

  if (readError) {
    NS_ERROR("Error occured while reading the permissions database!");
    return NS_ERROR_FAILURE;
  }

  return NS_OK;
}

static const char kMatchTypeHost[] = "host";

nsresult
nsPermissionManager::Import()
{
  ENSURE_NOT_CHILD_PROCESS;

  nsresult rv;

  nsCOMPtr<nsIFile> permissionsFile;
  rv = NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR, getter_AddRefs(permissionsFile));
  if (NS_FAILED(rv)) return rv;

  rv = permissionsFile->AppendNative(NS_LITERAL_CSTRING(kHostpermFileName));
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<nsIInputStream> fileInputStream;
  rv = NS_NewLocalFileInputStream(getter_AddRefs(fileInputStream),
                                  permissionsFile);
  if (NS_FAILED(rv)) return rv;

  nsCOMPtr<nsILineInputStream> lineInputStream = do_QueryInterface(fileInputStream, &rv);
  NS_ENSURE_SUCCESS(rv, rv);

  // start a transaction on the storage db, to optimize insertions.
  // transaction will automically commit on completion
  mozStorageTransaction transaction(mDBConn, true);

  /* format is:
   * matchtype \t type \t permission \t host
   * Only "host" is supported for matchtype
   * type is a string that identifies the type of permission (e.g. "cookie")
   * permission is an integer between 1 and 15
   */

  nsAutoCString buffer;
  bool isMore = true;
  while (isMore && NS_SUCCEEDED(lineInputStream->ReadLine(buffer, &isMore))) {
    if (buffer.IsEmpty() || buffer.First() == '#') {
      continue;
    }

    nsTArray<nsCString> lineArray;

    // Split the line at tabs
    ParseString(buffer, '\t', lineArray);

    if (lineArray[0].EqualsLiteral(kMatchTypeHost) &&
        lineArray.Length() == 4) {

      nsresult error;
      uint32_t permission = lineArray[2].ToInteger(&error);
      if (NS_FAILED(error))
        continue;

      // hosts might be encoded in UTF8; switch them to ACE to be consistent
      if (!IsASCII(lineArray[3])) {
        rv = NormalizeToACE(lineArray[3]);
        if (NS_FAILED(rv))
          continue;
      }

      nsCOMPtr<nsIPrincipal> principal;
      nsresult rv = GetPrincipal(lineArray[3], getter_AddRefs(principal));
      NS_ENSURE_SUCCESS(rv, rv);

      rv = AddInternal(principal, lineArray[1], permission, 0,
                       nsIPermissionManager::EXPIRE_NEVER, 0, eDontNotify, eWriteToDB);
      NS_ENSURE_SUCCESS(rv, rv);
    }
  }

  // we're done importing - delete the old file
  permissionsFile->Remove(false);

  return NS_OK;
}

nsresult
nsPermissionManager::NormalizeToACE(nsCString &aHost)
{
  // lazily init the IDN service
  if (!mIDNService) {
    nsresult rv;
    mIDNService = do_GetService(NS_IDNSERVICE_CONTRACTID, &rv);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  return mIDNService->ConvertUTF8toACE(aHost, aHost);
}

void
nsPermissionManager::UpdateDB(OperationType aOp,
                              mozIStorageAsyncStatement* aStmt,
                              int64_t aID,
                              const nsACString &aHost,
                              const nsACString &aType,
                              uint32_t aPermission,
                              uint32_t aExpireType,
                              int64_t aExpireTime,
                              uint32_t aAppId,
                              bool aIsInBrowserElement)
{
  ENSURE_NOT_CHILD_PROCESS_NORET;

  nsresult rv;

  // no statement is ok - just means we don't have a profile
  if (!aStmt)
    return;

  switch (aOp) {
  case eOperationAdding:
    {
      rv = aStmt->BindInt64ByIndex(0, aID);
      if (NS_FAILED(rv)) break;

      rv = aStmt->BindUTF8StringByIndex(1, aHost);
      if (NS_FAILED(rv)) break;

      rv = aStmt->BindUTF8StringByIndex(2, aType);
      if (NS_FAILED(rv)) break;

      rv = aStmt->BindInt32ByIndex(3, aPermission);
      if (NS_FAILED(rv)) break;

      rv = aStmt->BindInt32ByIndex(4, aExpireType);
      if (NS_FAILED(rv)) break;

      rv = aStmt->BindInt64ByIndex(5, aExpireTime);
      if (NS_FAILED(rv)) break;

      rv = aStmt->BindInt64ByIndex(6, aAppId);
      if (NS_FAILED(rv)) break;

      rv = aStmt->BindInt64ByIndex(7, aIsInBrowserElement);
      break;
    }

  case eOperationRemoving:
    {
      rv = aStmt->BindInt64ByIndex(0, aID);
      break;
    }

  case eOperationChanging:
    {
      rv = aStmt->BindInt64ByIndex(0, aID);
      if (NS_FAILED(rv)) break;

      rv = aStmt->BindInt32ByIndex(1, aPermission);
      if (NS_FAILED(rv)) break;

      rv = aStmt->BindInt32ByIndex(2, aExpireType);
      if (NS_FAILED(rv)) break;

      rv = aStmt->BindInt64ByIndex(3, aExpireTime);
      break;
    }

  default:
    {
      NS_NOTREACHED("need a valid operation in UpdateDB()!");
      rv = NS_ERROR_UNEXPECTED;
      break;
    }
  }

  if (NS_FAILED(rv)) {
    NS_WARNING("db change failed!");
    return;
  }

  nsCOMPtr<mozIStoragePendingStatement> pending;
  rv = aStmt->ExecuteAsync(nullptr, getter_AddRefs(pending));
  MOZ_ASSERT(NS_SUCCEEDED(rv));
}

NS_IMETHODIMP
nsPermissionManager::AddrefAppId(uint32_t aAppId)
{
  if (aAppId == nsIScriptSecurityManager::NO_APP_ID) {
    return NS_OK;
  }

  bool found = false;
  for (uint32_t i = 0; i < mAppIdRefcounts.Length(); ++i) {
    if (mAppIdRefcounts[i].mAppId == aAppId) {
      ++mAppIdRefcounts[i].mCounter;
      found = true;
      break;
    }
  }

  if (!found) {
    ApplicationCounter app = { aAppId, 1 };
    mAppIdRefcounts.AppendElement(app);
  }

  return NS_OK;
}

NS_IMETHODIMP
nsPermissionManager::ReleaseAppId(uint32_t aAppId)
{
  // An app has been released, maybe we have to reset its session.

  if (aAppId == nsIScriptSecurityManager::NO_APP_ID) {
    return NS_OK;
  }

  for (uint32_t i = 0; i < mAppIdRefcounts.Length(); ++i) {
    if (mAppIdRefcounts[i].mAppId == aAppId) {
      --mAppIdRefcounts[i].mCounter;

      if (!mAppIdRefcounts[i].mCounter) {
        mAppIdRefcounts.RemoveElementAt(i);
        return RemoveExpiredPermissionsForApp(aAppId);
      }

      break;
    }
  }

  return NS_OK;
}

NS_IMETHODIMP
nsPermissionManager::UpdateExpireTime(nsIPrincipal* aPrincipal,
                                     const char* aType,
                                     bool aExactHostMatch,
                                     uint64_t aSessionExpireTime,
                                     uint64_t aPersistentExpireTime)
{
  NS_ENSURE_ARG_POINTER(aPrincipal);
  NS_ENSURE_ARG_POINTER(aType);

  uint64_t nowms = PR_Now() / 1000;
  if (aSessionExpireTime < nowms || aPersistentExpireTime < nowms) {
    return NS_ERROR_INVALID_ARG;
  }

  if (nsContentUtils::IsSystemPrincipal(aPrincipal)) {
    return NS_OK;
  }

  nsAutoCString host;
  nsresult rv = GetHostForPrincipal(aPrincipal, host);
  NS_ENSURE_SUCCESS(rv, rv);

  int32_t typeIndex = GetTypeIndex(aType, false);
  // If type == -1, the type isn't known,
  // so just return NS_OK
  if (typeIndex == -1) return NS_OK;

  uint32_t appId;
  rv = aPrincipal->GetAppId(&appId);
  NS_ENSURE_SUCCESS(rv, rv);

  bool isInBrowserElement;
  rv = aPrincipal->GetIsInBrowserElement(&isInBrowserElement);
  NS_ENSURE_SUCCESS(rv, rv);

  PermissionHashKey* entry = GetPermissionHashKey(host, appId, isInBrowserElement,
                                                  typeIndex, aExactHostMatch);
  if (!entry) {
    return NS_OK;
  }

  int32_t idx = entry->GetPermissionIndex(typeIndex);
  if (-1 == idx) {
    return NS_OK;
  }

  PermissionEntry& perm = entry->GetPermissions()[idx];
  if (perm.mExpireType == EXPIRE_TIME) {
    perm.mExpireTime = aPersistentExpireTime;
  } else if (perm.mExpireType == EXPIRE_SESSION && perm.mExpireTime != 0) {
    perm.mExpireTime = aSessionExpireTime;
  }
  return NS_OK;
}