Source/WebKit2/UIProcess/Storage/LocalStorageDatabaseTracker.cpp - WebKit - Git at Google

 /*
  * Copyright (C) 2011, 2013 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. AND ITS CONTRIBUTORS ``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 ITS 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 "LocalStorageDatabaseTracker.h"

 #include "LocalStorageDetails.h"
 #include <WebCore/FileSystem.h>
 #include <WebCore/SQLiteStatement.h>
 #include <WebCore/SecurityOrigin.h>
 #include <WebCore/TextEncoding.h>
 #include <wtf/WorkQueue.h>
 #include <wtf/text/CString.h>

 using namespace WebCore;

 namespace WebKit {

 PassRefPtr<LocalStorageDatabaseTracker> LocalStorageDatabaseTracker::create(PassRefPtr<WorkQueue> queue, const String& localStorageDirectory)
 {
     return adoptRef(new LocalStorageDatabaseTracker(queue, localStorageDirectory));
 }

 LocalStorageDatabaseTracker::LocalStorageDatabaseTracker(PassRefPtr<WorkQueue> queue, const String& localStorageDirectory)
     : m_queue(queue)
     , m_localStorageDirectory(localStorageDirectory.isolatedCopy())
 {
     ASSERT(!m_localStorageDirectory.isEmpty());

     // Make sure the encoding is initialized before we start dispatching things to the queue.
     UTF8Encoding();

     RefPtr<LocalStorageDatabaseTracker> localStorageDatabaseTracker(this);
     m_queue->dispatch([localStorageDatabaseTracker] {
         localStorageDatabaseTracker->importOriginIdentifiers();
     });
 }

 LocalStorageDatabaseTracker::~LocalStorageDatabaseTracker()
 {
 }

 String LocalStorageDatabaseTracker::databasePath(SecurityOrigin* securityOrigin) const
 {
     return databasePath(securityOrigin->databaseIdentifier() + ".localstorage");
 }

 void LocalStorageDatabaseTracker::didOpenDatabaseWithOrigin(SecurityOrigin* securityOrigin)
 {
     addDatabaseWithOriginIdentifier(securityOrigin->databaseIdentifier(), databasePath(securityOrigin));
 }

 void LocalStorageDatabaseTracker::deleteDatabaseWithOrigin(SecurityOrigin* securityOrigin)
 {
     removeDatabaseWithOriginIdentifier(securityOrigin->databaseIdentifier());
 }

 void LocalStorageDatabaseTracker::deleteAllDatabases()
 {
     m_origins.clear();

     openTrackerDatabase(SkipIfNonExistent);
     if (!m_database.isOpen())
         return;

     SQLiteStatement statement(m_database, "SELECT origin, path FROM Origins");
     if (statement.prepare() != SQLResultOk) {
         LOG_ERROR("Failed to prepare statement.");
         return;
     }

     int result;
     while ((result = statement.step()) == SQLResultRow) {
         deleteFile(statement.getColumnText(1));

         // FIXME: Call out to the client.
     }

     if (result != SQLResultDone)
         LOG_ERROR("Failed to read in all origins from the database.");

     if (m_database.isOpen())
         m_database.close();

     if (!deleteFile(trackerDatabasePath())) {
         // In the case where it is not possible to delete the database file (e.g some other program
         // like a virus scanner is accessing it), make sure to remove all entries.
         openTrackerDatabase(SkipIfNonExistent);
         if (!m_database.isOpen())
             return;

         SQLiteStatement deleteStatement(m_database, "DELETE FROM Origins");
         if (deleteStatement.prepare() != SQLResultOk) {
             LOG_ERROR("Unable to prepare deletion of all origins");
             return;
         }
         if (!deleteStatement.executeCommand()) {
             LOG_ERROR("Unable to execute deletion of all origins");
             return;
         }
     }

     deleteEmptyDirectory(m_localStorageDirectory);
 }

 static Optional<time_t> fileCreationTime(const String& filePath)
 {
     time_t time;
     return getFileCreationTime(filePath, time) ? time : Optional<time_t>(Nullopt);
 }

 static Optional<time_t> fileModificationTime(const String& filePath)
 {
     time_t time;
     if (!getFileModificationTime(filePath, time))
         return Nullopt;

     return time;
 }

 Vector<Ref<SecurityOrigin>> LocalStorageDatabaseTracker::deleteDatabasesModifiedSince(std::chrono::system_clock::time_point time)
 {
     Vector<String> originIdentifiersToDelete;

     for (const String& origin : m_origins) {
         String filePath = pathForDatabaseWithOriginIdentifier(origin);

         auto modificationTime = fileModificationTime(filePath);
         if (!modificationTime)
             continue;

         if (modificationTime.value() >= std::chrono::system_clock::to_time_t(time))
             originIdentifiersToDelete.append(origin);
     }

     Vector<Ref<SecurityOrigin>> deletedDatabaseOrigins;
     deletedDatabaseOrigins.reserveInitialCapacity(originIdentifiersToDelete.size());

     for (const auto& originIdentifier : originIdentifiersToDelete) {
         removeDatabaseWithOriginIdentifier(originIdentifier);

         deletedDatabaseOrigins.uncheckedAppend(SecurityOrigin::createFromDatabaseIdentifier(originIdentifier));
     }

     return deletedDatabaseOrigins;
 }

 Vector<RefPtr<WebCore::SecurityOrigin>> LocalStorageDatabaseTracker::origins() const
 {
     Vector<RefPtr<SecurityOrigin>> origins;
     origins.reserveInitialCapacity(m_origins.size());

     for (const String& origin : m_origins)
         origins.uncheckedAppend(SecurityOrigin::createFromDatabaseIdentifier(origin));

     return origins;
 }

 Vector<LocalStorageDetails> LocalStorageDatabaseTracker::details()
 {
     Vector<LocalStorageDetails> result;
     result.reserveInitialCapacity(m_origins.size());

     for (const String& origin : m_origins) {
         String filePath = pathForDatabaseWithOriginIdentifier(origin);

         LocalStorageDetails details;
         details.originIdentifier = origin.isolatedCopy();
         details.creationTime = fileCreationTime(filePath);
         details.modificationTime = fileModificationTime(filePath);
         result.uncheckedAppend(details);
     }

     return result;
 }

 String LocalStorageDatabaseTracker::databasePath(const String& filename) const
 {
     if (!makeAllDirectories(m_localStorageDirectory)) {
         LOG_ERROR("Unable to create LocalStorage database path %s", m_localStorageDirectory.utf8().data());
         return String();
     }

     return pathByAppendingComponent(m_localStorageDirectory, filename);
 }

 String LocalStorageDatabaseTracker::trackerDatabasePath() const
 {
     return databasePath("StorageTracker.db");
 }

 void LocalStorageDatabaseTracker::openTrackerDatabase(DatabaseOpeningStrategy openingStrategy)
 {
     if (m_database.isOpen())
         return;

     String databasePath = trackerDatabasePath();

     if (!fileExists(databasePath) && openingStrategy == SkipIfNonExistent)
         return;

     if (!m_database.open(databasePath)) {
         LOG_ERROR("Failed to open databasePath %s.", databasePath.ascii().data());
         return;
     }

     // Since a WorkQueue isn't bound to a specific thread, we have to disable threading checks
     // even though we never access the database from different threads simultaneously.
     m_database.disableThreadingChecks();

     if (m_database.tableExists("Origins"))
         return;

     if (!m_database.executeCommand("CREATE TABLE Origins (origin TEXT UNIQUE ON CONFLICT REPLACE, path TEXT);"))
         LOG_ERROR("Failed to create Origins table.");
 }

 void LocalStorageDatabaseTracker::importOriginIdentifiers()
 {
     openTrackerDatabase(SkipIfNonExistent);

     if (m_database.isOpen()) {
         SQLiteStatement statement(m_database, "SELECT origin FROM Origins");
         if (statement.prepare() != SQLResultOk) {
             LOG_ERROR("Failed to prepare statement.");
             return;
         }

         int result;

         while ((result = statement.step()) == SQLResultRow)
             m_origins.add(statement.getColumnText(0));

         if (result != SQLResultDone) {
             LOG_ERROR("Failed to read in all origins from the database.");
             return;
         }
     }

     updateTrackerDatabaseFromLocalStorageDatabaseFiles();
 }

 void LocalStorageDatabaseTracker::updateTrackerDatabaseFromLocalStorageDatabaseFiles()
 {
     Vector<String> paths = listDirectory(m_localStorageDirectory, "*.localstorage");

     HashSet<String> origins(m_origins);
     HashSet<String> originsFromLocalStorageDatabaseFiles;

     for (size_t i = 0; i < paths.size(); ++i) {
         const String& path = paths[i];

         if (!path.endsWith(".localstorage"))
             continue;

         String filename = pathGetFileName(path);

         String originIdentifier = filename.substring(0, filename.length() - strlen(".localstorage"));

         if (!m_origins.contains(originIdentifier))
             addDatabaseWithOriginIdentifier(originIdentifier, path);

         originsFromLocalStorageDatabaseFiles.add(originIdentifier);
     }

     for (auto it = origins.begin(), end = origins.end(); it != end; ++it) {
         const String& originIdentifier = *it;
         if (origins.contains(originIdentifier))
             continue;

         removeDatabaseWithOriginIdentifier(originIdentifier);
     }
 }

 void LocalStorageDatabaseTracker::addDatabaseWithOriginIdentifier(const String& originIdentifier, const String& databasePath)
 {
     openTrackerDatabase(CreateIfNonExistent);
     if (!m_database.isOpen())
         return;

     SQLiteStatement statement(m_database, "INSERT INTO Origins VALUES (?, ?)");
     if (statement.prepare() != SQLResultOk) {
         LOG_ERROR("Unable to establish origin '%s' in the tracker", originIdentifier.utf8().data());
         return;
     }

     statement.bindText(1, originIdentifier);
     statement.bindText(2, databasePath);

     if (statement.step() != SQLResultDone)
         LOG_ERROR("Unable to establish origin '%s' in the tracker", originIdentifier.utf8().data());

     m_origins.add(originIdentifier);

     // FIXME: Tell clients that the origin was added.
 }

 void LocalStorageDatabaseTracker::removeDatabaseWithOriginIdentifier(const String& originIdentifier)
 {
     openTrackerDatabase(SkipIfNonExistent);
     if (!m_database.isOpen())
         return;

     String path = pathForDatabaseWithOriginIdentifier(originIdentifier);
     if (path.isEmpty())
         return;

     SQLiteStatement deleteStatement(m_database, "DELETE FROM Origins where origin=?");
     if (deleteStatement.prepare() != SQLResultOk) {
         LOG_ERROR("Unable to prepare deletion of origin '%s'", originIdentifier.ascii().data());
         return;
     }
     deleteStatement.bindText(1, originIdentifier);
     if (!deleteStatement.executeCommand()) {
         LOG_ERROR("Unable to execute deletion of origin '%s'", originIdentifier.ascii().data());
         return;
     }

     deleteFile(path);

     m_origins.remove(originIdentifier);
     if (m_origins.isEmpty()) {
         // There are no origins left; delete the tracker database.
         m_database.close();
         deleteFile(trackerDatabasePath());
         deleteEmptyDirectory(m_localStorageDirectory);
     }

     // FIXME: Tell clients that the origin was removed.
 }

 String LocalStorageDatabaseTracker::pathForDatabaseWithOriginIdentifier(const String& originIdentifier)
 {
     if (!m_database.isOpen())
         return String();

     SQLiteStatement pathStatement(m_database, "SELECT path FROM Origins WHERE origin=?");
     if (pathStatement.prepare() != SQLResultOk) {
         LOG_ERROR("Unable to prepare selection of path for origin '%s'", originIdentifier.utf8().data());
         return String();
     }

     pathStatement.bindText(1, originIdentifier);

     int result = pathStatement.step();
     if (result != SQLResultRow)
         return String();

     return pathStatement.getColumnText(0);
 }

 } // namespace WebKit
	/*
	* Copyright (C) 2011, 2013 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. AND ITS CONTRIBUTORS ``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 ITS 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 "LocalStorageDatabaseTracker.h"

	#include "LocalStorageDetails.h"
	#include <WebCore/FileSystem.h>
	#include <WebCore/SQLiteStatement.h>
	#include <WebCore/SecurityOrigin.h>
	#include <WebCore/TextEncoding.h>
	#include <wtf/WorkQueue.h>
	#include <wtf/text/CString.h>

	using namespace WebCore;

	namespace WebKit {

	PassRefPtr<LocalStorageDatabaseTracker> LocalStorageDatabaseTracker::create(PassRefPtr<WorkQueue> queue, const String& localStorageDirectory)
	{
	return adoptRef(new LocalStorageDatabaseTracker(queue, localStorageDirectory));
	}

	LocalStorageDatabaseTracker::LocalStorageDatabaseTracker(PassRefPtr<WorkQueue> queue, const String& localStorageDirectory)
	: m_queue(queue)
	, m_localStorageDirectory(localStorageDirectory.isolatedCopy())
	{
	ASSERT(!m_localStorageDirectory.isEmpty());

	// Make sure the encoding is initialized before we start dispatching things to the queue.
	UTF8Encoding();

	RefPtr<LocalStorageDatabaseTracker> localStorageDatabaseTracker(this);
	m_queue->dispatch([localStorageDatabaseTracker] {
	localStorageDatabaseTracker->importOriginIdentifiers();
	});
	}

	LocalStorageDatabaseTracker::~LocalStorageDatabaseTracker()
	{
	}

	String LocalStorageDatabaseTracker::databasePath(SecurityOrigin* securityOrigin) const
	{
	return databasePath(securityOrigin->databaseIdentifier() + ".localstorage");
	}

	void LocalStorageDatabaseTracker::didOpenDatabaseWithOrigin(SecurityOrigin* securityOrigin)
	{
	addDatabaseWithOriginIdentifier(securityOrigin->databaseIdentifier(), databasePath(securityOrigin));
	}

	void LocalStorageDatabaseTracker::deleteDatabaseWithOrigin(SecurityOrigin* securityOrigin)
	{
	removeDatabaseWithOriginIdentifier(securityOrigin->databaseIdentifier());
	}

	void LocalStorageDatabaseTracker::deleteAllDatabases()
	{
	m_origins.clear();

	openTrackerDatabase(SkipIfNonExistent);
	if (!m_database.isOpen())
	return;

	SQLiteStatement statement(m_database, "SELECT origin, path FROM Origins");
	if (statement.prepare() != SQLResultOk) {
	LOG_ERROR("Failed to prepare statement.");
	return;
	}

	int result;
	while ((result = statement.step()) == SQLResultRow) {
	deleteFile(statement.getColumnText(1));

	// FIXME: Call out to the client.
	}

	if (result != SQLResultDone)
	LOG_ERROR("Failed to read in all origins from the database.");

	if (m_database.isOpen())
	m_database.close();

	if (!deleteFile(trackerDatabasePath())) {
	// In the case where it is not possible to delete the database file (e.g some other program
	// like a virus scanner is accessing it), make sure to remove all entries.
	openTrackerDatabase(SkipIfNonExistent);
	if (!m_database.isOpen())
	return;

	SQLiteStatement deleteStatement(m_database, "DELETE FROM Origins");
	if (deleteStatement.prepare() != SQLResultOk) {
	LOG_ERROR("Unable to prepare deletion of all origins");
	return;
	}
	if (!deleteStatement.executeCommand()) {
	LOG_ERROR("Unable to execute deletion of all origins");
	return;
	}
	}

	deleteEmptyDirectory(m_localStorageDirectory);
	}

	static Optional<time_t> fileCreationTime(const String& filePath)
	{
	time_t time;
	return getFileCreationTime(filePath, time) ? time : Optional<time_t>(Nullopt);
	}

	static Optional<time_t> fileModificationTime(const String& filePath)
	{
	time_t time;
	if (!getFileModificationTime(filePath, time))
	return Nullopt;

	return time;
	}

	Vector<Ref<SecurityOrigin>> LocalStorageDatabaseTracker::deleteDatabasesModifiedSince(std::chrono::system_clock::time_point time)
	{
	Vector<String> originIdentifiersToDelete;

	for (const String& origin : m_origins) {
	String filePath = pathForDatabaseWithOriginIdentifier(origin);

	auto modificationTime = fileModificationTime(filePath);
	if (!modificationTime)
	continue;

	if (modificationTime.value() >= std::chrono::system_clock::to_time_t(time))
	originIdentifiersToDelete.append(origin);
	}

	Vector<Ref<SecurityOrigin>> deletedDatabaseOrigins;
	deletedDatabaseOrigins.reserveInitialCapacity(originIdentifiersToDelete.size());

	for (const auto& originIdentifier : originIdentifiersToDelete) {
	removeDatabaseWithOriginIdentifier(originIdentifier);

	deletedDatabaseOrigins.uncheckedAppend(SecurityOrigin::createFromDatabaseIdentifier(originIdentifier));
	}

	return deletedDatabaseOrigins;
	}

	Vector<RefPtr<WebCore::SecurityOrigin>> LocalStorageDatabaseTracker::origins() const
	{
	Vector<RefPtr<SecurityOrigin>> origins;
	origins.reserveInitialCapacity(m_origins.size());

	for (const String& origin : m_origins)
	origins.uncheckedAppend(SecurityOrigin::createFromDatabaseIdentifier(origin));

	return origins;
	}

	Vector<LocalStorageDetails> LocalStorageDatabaseTracker::details()
	{
	Vector<LocalStorageDetails> result;
	result.reserveInitialCapacity(m_origins.size());

	for (const String& origin : m_origins) {
	String filePath = pathForDatabaseWithOriginIdentifier(origin);

	LocalStorageDetails details;
	details.originIdentifier = origin.isolatedCopy();
	details.creationTime = fileCreationTime(filePath);
	details.modificationTime = fileModificationTime(filePath);
	result.uncheckedAppend(details);
	}

	return result;
	}

	String LocalStorageDatabaseTracker::databasePath(const String& filename) const
	{
	if (!makeAllDirectories(m_localStorageDirectory)) {
	LOG_ERROR("Unable to create LocalStorage database path %s", m_localStorageDirectory.utf8().data());
	return String();
	}

	return pathByAppendingComponent(m_localStorageDirectory, filename);
	}

	String LocalStorageDatabaseTracker::trackerDatabasePath() const
	{
	return databasePath("StorageTracker.db");
	}

	void LocalStorageDatabaseTracker::openTrackerDatabase(DatabaseOpeningStrategy openingStrategy)
	{
	if (m_database.isOpen())
	return;

	String databasePath = trackerDatabasePath();

	if (!fileExists(databasePath) && openingStrategy == SkipIfNonExistent)
	return;

	if (!m_database.open(databasePath)) {
	LOG_ERROR("Failed to open databasePath %s.", databasePath.ascii().data());
	return;
	}

	// Since a WorkQueue isn't bound to a specific thread, we have to disable threading checks
	// even though we never access the database from different threads simultaneously.
	m_database.disableThreadingChecks();

	if (m_database.tableExists("Origins"))
	return;

	if (!m_database.executeCommand("CREATE TABLE Origins (origin TEXT UNIQUE ON CONFLICT REPLACE, path TEXT);"))
	LOG_ERROR("Failed to create Origins table.");
	}

	void LocalStorageDatabaseTracker::importOriginIdentifiers()
	{
	openTrackerDatabase(SkipIfNonExistent);

	if (m_database.isOpen()) {
	SQLiteStatement statement(m_database, "SELECT origin FROM Origins");
	if (statement.prepare() != SQLResultOk) {
	LOG_ERROR("Failed to prepare statement.");
	return;
	}

	int result;

	while ((result = statement.step()) == SQLResultRow)
	m_origins.add(statement.getColumnText(0));

	if (result != SQLResultDone) {
	LOG_ERROR("Failed to read in all origins from the database.");
	return;
	}
	}

	updateTrackerDatabaseFromLocalStorageDatabaseFiles();
	}

	void LocalStorageDatabaseTracker::updateTrackerDatabaseFromLocalStorageDatabaseFiles()
	{
	Vector<String> paths = listDirectory(m_localStorageDirectory, "*.localstorage");

	HashSet<String> origins(m_origins);
	HashSet<String> originsFromLocalStorageDatabaseFiles;

	for (size_t i = 0; i < paths.size(); ++i) {
	const String& path = paths[i];

	if (!path.endsWith(".localstorage"))
	continue;

	String filename = pathGetFileName(path);

	String originIdentifier = filename.substring(0, filename.length() - strlen(".localstorage"));

	if (!m_origins.contains(originIdentifier))
	addDatabaseWithOriginIdentifier(originIdentifier, path);

	originsFromLocalStorageDatabaseFiles.add(originIdentifier);
	}

	for (auto it = origins.begin(), end = origins.end(); it != end; ++it) {
	const String& originIdentifier = *it;
	if (origins.contains(originIdentifier))
	continue;

	removeDatabaseWithOriginIdentifier(originIdentifier);
	}
	}

	void LocalStorageDatabaseTracker::addDatabaseWithOriginIdentifier(const String& originIdentifier, const String& databasePath)
	{
	openTrackerDatabase(CreateIfNonExistent);
	if (!m_database.isOpen())
	return;

	SQLiteStatement statement(m_database, "INSERT INTO Origins VALUES (?, ?)");
	if (statement.prepare() != SQLResultOk) {
	LOG_ERROR("Unable to establish origin '%s' in the tracker", originIdentifier.utf8().data());
	return;
	}

	statement.bindText(1, originIdentifier);
	statement.bindText(2, databasePath);

	if (statement.step() != SQLResultDone)
	LOG_ERROR("Unable to establish origin '%s' in the tracker", originIdentifier.utf8().data());

	m_origins.add(originIdentifier);

	// FIXME: Tell clients that the origin was added.
	}

	void LocalStorageDatabaseTracker::removeDatabaseWithOriginIdentifier(const String& originIdentifier)
	{
	openTrackerDatabase(SkipIfNonExistent);
	if (!m_database.isOpen())
	return;

	String path = pathForDatabaseWithOriginIdentifier(originIdentifier);
	if (path.isEmpty())
	return;

	SQLiteStatement deleteStatement(m_database, "DELETE FROM Origins where origin=?");
	if (deleteStatement.prepare() != SQLResultOk) {
	LOG_ERROR("Unable to prepare deletion of origin '%s'", originIdentifier.ascii().data());
	return;
	}
	deleteStatement.bindText(1, originIdentifier);
	if (!deleteStatement.executeCommand()) {
	LOG_ERROR("Unable to execute deletion of origin '%s'", originIdentifier.ascii().data());
	return;
	}

	deleteFile(path);

	m_origins.remove(originIdentifier);
	if (m_origins.isEmpty()) {
	// There are no origins left; delete the tracker database.
	m_database.close();
	deleteFile(trackerDatabasePath());
	deleteEmptyDirectory(m_localStorageDirectory);
	}

	// FIXME: Tell clients that the origin was removed.
	}

	String LocalStorageDatabaseTracker::pathForDatabaseWithOriginIdentifier(const String& originIdentifier)
	{
	if (!m_database.isOpen())
	return String();

	SQLiteStatement pathStatement(m_database, "SELECT path FROM Origins WHERE origin=?");
	if (pathStatement.prepare() != SQLResultOk) {
	LOG_ERROR("Unable to prepare selection of path for origin '%s'", originIdentifier.utf8().data());
	return String();
	}

	pathStatement.bindText(1, originIdentifier);

	int result = pathStatement.step();
	if (result != SQLResultRow)
	return String();

	return pathStatement.getColumnText(0);
	}

	} // namespace WebKit