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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_SAFE_SEARCH_API_URL_CHECKER_H_
#define COMPONENTS_SAFE_SEARCH_API_URL_CHECKER_H_
#include <list>
#include <memory>
#include "base/containers/lru_cache.h"
#include "base/functional/callback_forward.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "components/safe_search_api/url_checker_client.h"
#include "url/gurl.h"
namespace safe_search_api {
// The SafeSearch API classification of a URL.
enum class Classification { SAFE, UNSAFE };
// This class uses one implementation of URLCheckerClient to check the
// classification of the content on a given URL and returns the result
// asynchronously via a callback. It is also responsible for the synchronous
// logic such as caching, the injected URLCheckerClient is who makes the
// async request.
class URLChecker {
public:
// Used to report whether |url| should be blocked. Called from CheckURL.
using CheckCallback = base::OnceCallback<
void(const GURL&, Classification classification, bool /* uncertain */)>;
explicit URLChecker(std::unique_ptr<URLCheckerClient> async_checker);
URLChecker(std::unique_ptr<URLCheckerClient> async_checker,
size_t cache_size);
URLChecker(const URLChecker&) = delete;
URLChecker& operator=(const URLChecker&) = delete;
~URLChecker();
// Returns whether |callback| was run synchronously.
bool CheckURL(const GURL& url, CheckCallback callback);
void SetCacheTimeoutForTesting(const base::TimeDelta& timeout) {
cache_timeout_ = timeout;
}
private:
struct Check;
struct CheckResult {
CheckResult() = delete;
CheckResult(Classification classification, bool uncertain);
Classification classification;
bool uncertain;
base::TimeTicks timestamp;
};
using CheckList = std::list<std::unique_ptr<Check>>;
void OnAsyncCheckComplete(CheckList::iterator it,
const GURL& url,
ClientClassification classification);
std::unique_ptr<URLCheckerClient> async_checker_;
CheckList checks_in_progress_;
base::LRUCache<GURL, CheckResult> cache_;
base::TimeDelta cache_timeout_;
base::WeakPtrFactory<URLChecker> weak_factory_{this};
};
} // namespace safe_search_api
#endif // COMPONENTS_SAFE_SEARCH_API_URL_CHECKER_H_
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