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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/safe_browsing/safe_browsing_database.h"
#include "base/file_util.h"
#include "base/logging.h"
#include "base/sha2.h"
#include "chrome/browser/safe_browsing/safe_browsing_database_impl.h"
#include "googleurl/src/gurl.h"
// Filename suffix for the bloom filter.
static const wchar_t kBloomFilterFile[] = L" Filter";
// Factory method.
SafeBrowsingDatabase* SafeBrowsingDatabase::Create() {
return new SafeBrowsingDatabaseImpl;
}
bool SafeBrowsingDatabase::NeedToCheckUrl(const GURL& url) {
if (!bloom_filter_.get())
return true;
IncrementBloomFilterReadCount();
std::vector<std::string> hosts;
safe_browsing_util::GenerateHostsToCheck(url, &hosts);
if (hosts.size() == 0)
return false; // Could be about:blank.
SBPrefix host_key;
if (url.HostIsIPAddress()) {
base::SHA256HashString(url.host() + "/", &host_key, sizeof(SBPrefix));
if (bloom_filter_->Exists(host_key))
return true;
} else {
base::SHA256HashString(hosts[0] + "/", &host_key, sizeof(SBPrefix));
if (bloom_filter_->Exists(host_key))
return true;
if (hosts.size() > 1) {
base::SHA256HashString(hosts[1] + "/", &host_key, sizeof(SBPrefix));
if (bloom_filter_->Exists(host_key))
return true;
}
}
return false;
}
std::wstring SafeBrowsingDatabase::BloomFilterFilename(
const std::wstring& db_filename) {
return db_filename + kBloomFilterFile;
}
void SafeBrowsingDatabase::LoadBloomFilter() {
DCHECK(!bloom_filter_filename_.empty());
int64 size_64;
if (!file_util::GetFileSize(bloom_filter_filename_, &size_64) ||
size_64 == 0) {
BuildBloomFilter();
return;
}
int size = static_cast<int>(size_64);
char* data = new char[size];
CHECK(data);
Time before = Time::Now();
file_util::ReadFile(bloom_filter_filename_, data, size);
SB_DLOG(INFO) << "SafeBrowsingDatabase read bloom filter in " <<
(Time::Now() - before).InMilliseconds() << " ms";
bloom_filter_.reset(new BloomFilter(data, size));
}
void SafeBrowsingDatabase::DeleteBloomFilter() {
file_util::Delete(bloom_filter_filename_, false);
}
void SafeBrowsingDatabase::WriteBloomFilter() {
if (!bloom_filter_.get())
return;
Time before = Time::Now();
file_util::WriteFile(bloom_filter_filename_,
bloom_filter_->data(),
bloom_filter_->size());
SB_DLOG(INFO) << "SafeBrowsingDatabase wrote bloom filter in " <<
(Time::Now() - before).InMilliseconds() << " ms";
}
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