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/*
* Copyright (C) 2008 Apple Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "ApplicationCacheStorage.h"
#if ENABLE(OFFLINE_WEB_APPLICATIONS)
#include "ApplicationCache.h"
#include "ApplicationCacheGroup.h"
#include "ApplicationCacheResource.h"
#include "FileSystem.h"
#include "CString.h"
#include "KURL.h"
#include "SQLiteStatement.h"
#include "SQLiteTransaction.h"
namespace WebCore {
static unsigned urlHostHash(const KURL& url)
{
unsigned hostStart = url.hostStart();
unsigned hostEnd = url.hostEnd();
return AlreadyHashed::avoidDeletedValue(StringImpl::computeHash(url.string().characters() + hostStart, hostEnd - hostStart));
}
ApplicationCacheGroup* ApplicationCacheStorage::loadCacheGroup(const KURL& manifestURL)
{
openDatabase(false);
if (!m_database.isOpen())
return 0;
SQLiteStatement statement(m_database, "SELECT id, manifestURL, newestCache FROM CacheGroups WHERE newestCache IS NOT NULL AND manifestURL=?");
if (statement.prepare() != SQLResultOk)
return 0;
statement.bindText(1, manifestURL);
int result = statement.step();
if (result == SQLResultDone)
return 0;
if (result != SQLResultRow) {
LOG_ERROR("Could not load cache group, error \"%s\"", m_database.lastErrorMsg());
return 0;
}
unsigned newestCacheStorageID = (unsigned)statement.getColumnInt64(2);
RefPtr<ApplicationCache> cache = loadCache(newestCacheStorageID);
if (!cache)
return 0;
ApplicationCacheGroup* group = new ApplicationCacheGroup(manifestURL);
group->setStorageID((unsigned)statement.getColumnInt64(0));
group->setNewestCache(cache.release());
return group;
}
ApplicationCacheGroup* ApplicationCacheStorage::findOrCreateCacheGroup(const KURL& manifestURL)
{
std::pair<CacheGroupMap::iterator, bool> result = m_cachesInMemory.add(manifestURL, 0);
if (!result.second) {
ASSERT(result.first->second);
return result.first->second;
}
// Look up the group in the database
ApplicationCacheGroup* group = loadCacheGroup(manifestURL);
// If the group was not found we need to create it
if (!group) {
group = new ApplicationCacheGroup(manifestURL);
m_cacheHostSet.add(urlHostHash(manifestURL));
}
result.first->second = group;
return group;
}
void ApplicationCacheStorage::loadManifestHostHashes()
{
static bool hasLoadedHashes = false;
if (hasLoadedHashes)
return;
// We set this flag to true before the database has been opened
// to avoid trying to open the database over and over if it doesn't exist.
hasLoadedHashes = true;
openDatabase(false);
if (!m_database.isOpen())
return;
// Fetch the host hashes.
SQLiteStatement statement(m_database, "SELECT manifestHostHash FROM CacheGroups");
if (statement.prepare() != SQLResultOk)
return;
int result;
while ((result = statement.step()) == SQLResultRow)
m_cacheHostSet.add((unsigned)statement.getColumnInt64(0));
}
ApplicationCacheGroup* ApplicationCacheStorage::cacheGroupForURL(const KURL& url)
{
loadManifestHostHashes();
// Hash the host name and see if there's a manifest with the same host.
if (!m_cacheHostSet.contains(urlHostHash(url)))
return 0;
// Check if a cache already exists in memory.
CacheGroupMap::const_iterator end = m_cachesInMemory.end();
for (CacheGroupMap::const_iterator it = m_cachesInMemory.begin(); it != end; ++it) {
ApplicationCacheGroup* group = it->second;
if (!protocolHostAndPortAreEqual(url, group->manifestURL()))
continue;
if (ApplicationCache* cache = group->newestCache()) {
if (cache->resourceForURL(url))
return group;
}
}
if (!m_database.isOpen())
return 0;
// Check the database. Look for all cache groups with a newest cache.
SQLiteStatement statement(m_database, "SELECT id, manifestURL, newestCache FROM CacheGroups WHERE newestCache IS NOT NULL");
if (statement.prepare() != SQLResultOk)
return 0;
int result;
while ((result = statement.step()) == SQLResultRow) {
KURL manifestURL = KURL(statement.getColumnText(1));
if (!protocolHostAndPortAreEqual(url, manifestURL))
continue;
// We found a cache group that matches. Now check if the newest cache has a resource with
// a matching URL.
unsigned newestCacheID = (unsigned)statement.getColumnInt64(2);
RefPtr<ApplicationCache> cache = loadCache(newestCacheID);
if (!cache->resourceForURL(url))
continue;
ApplicationCacheGroup* group = new ApplicationCacheGroup(manifestURL);
group->setStorageID((unsigned)statement.getColumnInt64(0));
group->setNewestCache(cache.release());
ASSERT(!m_cachesInMemory.contains(manifestURL));
m_cachesInMemory.set(group->manifestURL(), group);
return group;
}
if (result != SQLResultDone)
LOG_ERROR("Could not load cache group, error \"%s\"", m_database.lastErrorMsg());
return 0;
}
void ApplicationCacheStorage::cacheGroupDestroyed(ApplicationCacheGroup* group)
{
ASSERT(m_cachesInMemory.get(group->manifestURL()) == group);
m_cachesInMemory.remove(group->manifestURL());
// If the cache is half-created, we don't want it in the saved set.
if (!group->savedNewestCachePointer())
m_cacheHostSet.remove(urlHostHash(group->manifestURL()));
}
void ApplicationCacheStorage::setCacheDirectory(const String& cacheDirectory)
{
ASSERT(m_cacheDirectory.isNull());
ASSERT(!cacheDirectory.isNull());
m_cacheDirectory = cacheDirectory;
}
bool ApplicationCacheStorage::executeSQLCommand(const String& sql)
{
ASSERT(m_database.isOpen());
bool result = m_database.executeCommand(sql);
if (!result)
LOG_ERROR("Application Cache Storage: failed to execute statement \"%s\" error \"%s\"",
sql.utf8().data(), m_database.lastErrorMsg());
return result;
}
static const int SchemaVersion = 2;
void ApplicationCacheStorage::verifySchemaVersion()
{
if (m_database.tableExists("SchemaVersion")) {
int version = SQLiteStatement(m_database, "SELECT version from SchemaVersion").getColumnInt(0);
if (version == SchemaVersion)
return;
}
m_database.clearAllTables();
SQLiteTransaction createSchemaVersionTable(m_database);
createSchemaVersionTable.begin();
executeSQLCommand("CREATE TABLE SchemaVersion (version INTEGER NOT NULL)");
SQLiteStatement statement(m_database, "INSERT INTO SchemaVersion (version) VALUES (?)");
if (statement.prepare() != SQLResultOk)
return;
statement.bindInt64(1, SchemaVersion);
executeStatement(statement);
createSchemaVersionTable.commit();
}
void ApplicationCacheStorage::openDatabase(bool createIfDoesNotExist)
{
if (m_database.isOpen())
return;
// The cache directory should never be null, but if it for some weird reason is we bail out.
if (m_cacheDirectory.isNull())
return;
String applicationCachePath = pathByAppendingComponent(m_cacheDirectory, "ApplicationCache.db");
if (!createIfDoesNotExist && !fileExists(applicationCachePath))
return;
makeAllDirectories(m_cacheDirectory);
m_database.open(applicationCachePath);
if (!m_database.isOpen())
return;
verifySchemaVersion();
// Create tables
executeSQLCommand("CREATE TABLE IF NOT EXISTS CacheGroups (id INTEGER PRIMARY KEY AUTOINCREMENT, "
"manifestHostHash INTEGER NOT NULL ON CONFLICT FAIL, manifestURL TEXT UNIQUE ON CONFLICT FAIL, newestCache INTEGER)");
executeSQLCommand("CREATE TABLE IF NOT EXISTS Caches (id INTEGER PRIMARY KEY AUTOINCREMENT, cacheGroup INTEGER)");
executeSQLCommand("CREATE TABLE IF NOT EXISTS CacheWhitelistURLs (url TEXT NOT NULL ON CONFLICT FAIL, cache INTEGER NOT NULL ON CONFLICT FAIL)");
executeSQLCommand("CREATE TABLE IF NOT EXISTS FallbackURLs (namespace TEXT NOT NULL ON CONFLICT FAIL, fallbackURL TEXT NOT NULL ON CONFLICT FAIL, "
"cache INTEGER NOT NULL ON CONFLICT FAIL)");
executeSQLCommand("CREATE TABLE IF NOT EXISTS CacheEntries (cache INTEGER NOT NULL ON CONFLICT FAIL, type INTEGER, resource INTEGER NOT NULL)");
executeSQLCommand("CREATE TABLE IF NOT EXISTS CacheResources (id INTEGER PRIMARY KEY AUTOINCREMENT, url TEXT NOT NULL ON CONFLICT FAIL, "
"statusCode INTEGER NOT NULL, responseURL TEXT NOT NULL, mimeType TEXT, textEncodingName TEXT, headers TEXT, data INTEGER NOT NULL ON CONFLICT FAIL)");
executeSQLCommand("CREATE TABLE IF NOT EXISTS CacheResourceData (id INTEGER PRIMARY KEY AUTOINCREMENT, data BLOB)");
// When a cache is deleted, all its entries and its whitelist should be deleted.
executeSQLCommand("CREATE TRIGGER IF NOT EXISTS CacheDeleted AFTER DELETE ON Caches"
" FOR EACH ROW BEGIN"
" DELETE FROM CacheEntries WHERE cache = OLD.id;"
" DELETE FROM CacheWhitelistURLs WHERE cache = OLD.id;"
" DELETE FROM FallbackURLs WHERE cache = OLD.id;"
" END");
// When a cache resource is deleted, its data blob should also be deleted.
executeSQLCommand("CREATE TRIGGER IF NOT EXISTS CacheResourceDeleted AFTER DELETE ON CacheResources"
" FOR EACH ROW BEGIN"
" DELETE FROM CacheResourceData WHERE id = OLD.data;"
" END");
}
bool ApplicationCacheStorage::executeStatement(SQLiteStatement& statement)
{
bool result = statement.executeCommand();
if (!result)
LOG_ERROR("Application Cache Storage: failed to execute statement \"%s\" error \"%s\"",
statement.query().utf8().data(), m_database.lastErrorMsg());
return result;
}
bool ApplicationCacheStorage::store(ApplicationCacheGroup* group)
{
ASSERT(group->storageID() == 0);
SQLiteStatement statement(m_database, "INSERT INTO CacheGroups (manifestHostHash, manifestURL) VALUES (?, ?)");
if (statement.prepare() != SQLResultOk)
return false;
statement.bindInt64(1, urlHostHash(group->manifestURL()));
statement.bindText(2, group->manifestURL());
if (!executeStatement(statement))
return false;
group->setStorageID((unsigned)m_database.lastInsertRowID());
return true;
}
bool ApplicationCacheStorage::store(ApplicationCache* cache)
{
ASSERT(cache->storageID() == 0);
ASSERT(cache->group()->storageID() != 0);
SQLiteStatement statement(m_database, "INSERT INTO Caches (cacheGroup) VALUES (?)");
if (statement.prepare() != SQLResultOk)
return false;
statement.bindInt64(1, cache->group()->storageID());
if (!executeStatement(statement))
return false;
unsigned cacheStorageID = (unsigned)m_database.lastInsertRowID();
// Store all resources
{
ApplicationCache::ResourceMap::const_iterator end = cache->end();
for (ApplicationCache::ResourceMap::const_iterator it = cache->begin(); it != end; ++it) {
if (!store(it->second.get(), cacheStorageID))
return false;
}
}
// Store the online whitelist
const HashSet<String>& onlineWhitelist = cache->onlineWhitelist();
{
HashSet<String>::const_iterator end = onlineWhitelist.end();
for (HashSet<String>::const_iterator it = onlineWhitelist.begin(); it != end; ++it) {
SQLiteStatement statement(m_database, "INSERT INTO CacheWhitelistURLs (url, cache) VALUES (?, ?)");
statement.prepare();
statement.bindText(1, *it);
statement.bindInt64(2, cacheStorageID);
if (!executeStatement(statement))
return false;
}
}
cache->setStorageID(cacheStorageID);
return true;
}
bool ApplicationCacheStorage::store(ApplicationCacheResource* resource, unsigned cacheStorageID)
{
ASSERT(cacheStorageID);
ASSERT(!resource->storageID());
openDatabase(true);
// First, insert the data
SQLiteStatement dataStatement(m_database, "INSERT INTO CacheResourceData (data) VALUES (?)");
if (dataStatement.prepare() != SQLResultOk)
return false;
if (resource->data()->size())
dataStatement.bindBlob(1, resource->data()->data(), resource->data()->size());
if (!dataStatement.executeCommand())
return false;
unsigned dataId = (unsigned)m_database.lastInsertRowID();
// Then, insert the resource
// Serialize the headers
Vector<UChar> stringBuilder;
HTTPHeaderMap::const_iterator end = resource->response().httpHeaderFields().end();
for (HTTPHeaderMap::const_iterator it = resource->response().httpHeaderFields().begin(); it!= end; ++it) {
stringBuilder.append(it->first.characters(), it->first.length());
stringBuilder.append((UChar)':');
stringBuilder.append(it->second.characters(), it->second.length());
stringBuilder.append((UChar)'\n');
}
String headers = String::adopt(stringBuilder);
SQLiteStatement resourceStatement(m_database, "INSERT INTO CacheResources (url, statusCode, responseURL, headers, data, mimeType, textEncodingName) VALUES (?, ?, ?, ?, ?, ?, ?)");
if (resourceStatement.prepare() != SQLResultOk)
return false;
resourceStatement.bindText(1, resource->url());
resourceStatement.bindInt64(2, resource->response().httpStatusCode());
resourceStatement.bindText(3, resource->response().url());
resourceStatement.bindText(4, headers);
resourceStatement.bindInt64(5, dataId);
resourceStatement.bindText(6, resource->response().mimeType());
resourceStatement.bindText(7, resource->response().textEncodingName());
if (!executeStatement(resourceStatement))
return false;
unsigned resourceId = (unsigned)m_database.lastInsertRowID();
// Finally, insert the cache entry
SQLiteStatement entryStatement(m_database, "INSERT INTO CacheEntries (cache, type, resource) VALUES (?, ?, ?)");
if (entryStatement.prepare() != SQLResultOk)
return false;
entryStatement.bindInt64(1, cacheStorageID);
entryStatement.bindInt64(2, resource->type());
entryStatement.bindInt64(3, resourceId);
if (!executeStatement(entryStatement))
return false;
resource->setStorageID(resourceId);
return true;
}
void ApplicationCacheStorage::store(ApplicationCacheResource* resource, ApplicationCache* cache)
{
ASSERT(cache->storageID());
openDatabase(true);
SQLiteTransaction storeResourceTransaction(m_database);
storeResourceTransaction.begin();
if (!store(resource, cache->storageID()))
return;
storeResourceTransaction.commit();
}
bool ApplicationCacheStorage::storeNewestCache(ApplicationCacheGroup* group)
{
openDatabase(true);
SQLiteTransaction storeCacheTransaction(m_database);
storeCacheTransaction.begin();
if (!group->storageID()) {
// Store the group
if (!store(group))
return false;
}
ASSERT(group->newestCache());
ASSERT(!group->newestCache()->storageID());
// Store the newest cache
if (!store(group->newestCache()))
return false;
// Update the newest cache in the group.
SQLiteStatement statement(m_database, "UPDATE CacheGroups SET newestCache=? WHERE id=?");
if (statement.prepare() != SQLResultOk)
return false;
statement.bindInt64(1, group->newestCache()->storageID());
statement.bindInt64(2, group->storageID());
if (!executeStatement(statement))
return false;
storeCacheTransaction.commit();
return true;
}
static inline void parseHeader(const UChar* header, size_t headerLength, ResourceResponse& response)
{
int pos = find(header, headerLength, ':');
ASSERT(pos != -1);
String headerName = String(header, pos);
String headerValue = String(header + pos + 1, headerLength - pos - 1);
response.setHTTPHeaderField(headerName, headerValue);
}
static inline void parseHeaders(const String& headers, ResourceResponse& response)
{
int startPos = 0;
int endPos;
while ((endPos = headers.find('\n', startPos)) != -1) {
ASSERT(startPos != endPos);
parseHeader(headers.characters() + startPos, endPos - startPos, response);
startPos = endPos + 1;
}
if (startPos != static_cast<int>(headers.length()))
parseHeader(headers.characters(), headers.length(), response);
}
PassRefPtr<ApplicationCache> ApplicationCacheStorage::loadCache(unsigned storageID)
{
SQLiteStatement cacheStatement(m_database,
"SELECT url, type, mimeType, textEncodingName, headers, CacheResourceData.data FROM CacheEntries INNER JOIN CacheResources ON CacheEntries.resource=CacheResources.id "
"INNER JOIN CacheResourceData ON CacheResourceData.id=CacheResources.data WHERE CacheEntries.cache=?");
if (cacheStatement.prepare() != SQLResultOk) {
LOG_ERROR("Could not prepare cache statement, error \"%s\"", m_database.lastErrorMsg());
return 0;
}
cacheStatement.bindInt64(1, storageID);
RefPtr<ApplicationCache> cache = ApplicationCache::create();
int result;
while ((result = cacheStatement.step()) == SQLResultRow) {
KURL url(cacheStatement.getColumnText(0));
unsigned type = (unsigned)cacheStatement.getColumnInt64(1);
Vector<char> blob;
cacheStatement.getColumnBlobAsVector(5, blob);
RefPtr<SharedBuffer> data = SharedBuffer::adoptVector(blob);
String mimeType = cacheStatement.getColumnText(2);
String textEncodingName = cacheStatement.getColumnText(3);
ResourceResponse response(url, mimeType, data->size(), textEncodingName, "");
String headers = cacheStatement.getColumnText(4);
parseHeaders(headers, response);
RefPtr<ApplicationCacheResource> resource = ApplicationCacheResource::create(url, response, type, data.release());
if (type & ApplicationCacheResource::Manifest)
cache->setManifestResource(resource.release());
else
cache->addResource(resource.release());
}
if (result != SQLResultDone)
LOG_ERROR("Could not load cache resources, error \"%s\"", m_database.lastErrorMsg());
// Load the online whitelist
SQLiteStatement whitelistStatement(m_database, "SELECT url FROM CacheWhitelistURLs WHERE cache=?");
if (whitelistStatement.prepare() != SQLResultOk)
return 0;
whitelistStatement.bindInt64(1, storageID);
HashSet<String> whitelist;
while ((result = whitelistStatement.step()) == SQLResultRow)
whitelist.add(whitelistStatement.getColumnText(0));
if (result != SQLResultDone)
LOG_ERROR("Could not load cache online whitelist, error \"%s\"", m_database.lastErrorMsg());
cache->setOnlineWhitelist(whitelist);
cache->setStorageID(storageID);
return cache.release();
}
void ApplicationCacheStorage::remove(ApplicationCache* cache)
{
if (!cache->storageID())
return;
openDatabase(false);
if (!m_database.isOpen())
return;
SQLiteStatement statement(m_database, "DELETE FROM Caches WHERE id=?");
if (statement.prepare() != SQLResultOk)
return;
statement.bindInt64(1, cache->storageID());
executeStatement(statement);
}
void ApplicationCacheStorage::empty()
{
openDatabase(false);
if (!m_database.isOpen())
return;
// Clear cache groups, caches and cache resources.
executeSQLCommand("DELETE FROM CacheGroups");
executeSQLCommand("DELETE FROM Caches");
executeSQLCommand("DELETE FROM CacheResources");
// Clear the storage IDs for the caches in memory.
// The caches will still work, but cached resources will not be saved to disk
// until a cache update process has been initiated.
CacheGroupMap::const_iterator end = m_cachesInMemory.end();
for (CacheGroupMap::const_iterator it = m_cachesInMemory.begin(); it != end; ++it)
it->second->clearStorageID();
}
bool ApplicationCacheStorage::storeCopyOfCache(const String& cacheDirectory, ApplicationCache* cache)
{
// Create a new cache.
RefPtr<ApplicationCache> cacheCopy = ApplicationCache::create();
// Set the online whitelist
cacheCopy->setOnlineWhitelist(cache->onlineWhitelist());
// Traverse the cache and add copies of all resources.
ApplicationCache::ResourceMap::const_iterator end = cache->end();
for (ApplicationCache::ResourceMap::const_iterator it = cache->begin(); it != end; ++it) {
ApplicationCacheResource* resource = it->second.get();
RefPtr<ApplicationCacheResource> resourceCopy = ApplicationCacheResource::create(resource->url(), resource->response(), resource->type(), resource->data());
cacheCopy->addResource(resourceCopy.release());
}
// Now create a new cache group.
OwnPtr<ApplicationCacheGroup> groupCopy(new ApplicationCacheGroup(cache->group()->manifestURL(), true));
groupCopy->setNewestCache(cacheCopy);
ApplicationCacheStorage copyStorage;
copyStorage.setCacheDirectory(cacheDirectory);
// Empty the cache in case something was there before.
copyStorage.empty();
return copyStorage.storeNewestCache(groupCopy.get());
}
ApplicationCacheStorage& cacheStorage()
{
static ApplicationCacheStorage storage;
return storage;
}
} // namespace WebCore
#endif // ENABLE(OFFLINE_WEB_APPLICATIONS)
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