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// Copyright 2014 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.
#ifndef CHROME_BROWSER_SUPERVISED_USER_EXPERIMENTAL_SUPERVISED_USER_ASYNC_URL_CHECKER_H_
#define CHROME_BROWSER_SUPERVISED_USER_EXPERIMENTAL_SUPERVISED_USER_ASYNC_URL_CHECKER_H_
#include <string>
#include "base/callback_forward.h"
#include "base/containers/mru_cache.h"
#include "base/macros.h"
#include "base/memory/scoped_vector.h"
#include "chrome/browser/supervised_user/supervised_user_url_filter.h"
#include "net/url_request/url_fetcher_delegate.h"
#include "url/gurl.h"
namespace net {
class URLFetcher;
class URLRequestContextGetter;
}
// This class checks against an online service (currently a Custom Search
// Engine using SafeSearch) whether a given URL is safe to visit for a
// supervised user, and returns the result asynchronously via a callback.
class SupervisedUserAsyncURLChecker : net::URLFetcherDelegate {
public:
// Returns whether |url| should be blocked. Called from CheckURL.
typedef base::Callback<void(const GURL&,
SupervisedUserURLFilter::FilteringBehavior,
bool /* uncertain */)>
CheckCallback;
SupervisedUserAsyncURLChecker(net::URLRequestContextGetter* context,
const std::string& cx);
SupervisedUserAsyncURLChecker(net::URLRequestContextGetter* context,
const std::string& cx,
size_t cache_size);
~SupervisedUserAsyncURLChecker() override;
// Returns whether |callback| was run synchronously.
bool CheckURL(const GURL& url, const CheckCallback& callback);
private:
struct Check;
struct CheckResult {
CheckResult(SupervisedUserURLFilter::FilteringBehavior behavior,
bool uncertain);
SupervisedUserURLFilter::FilteringBehavior behavior;
bool uncertain;
};
// net::URLFetcherDelegate implementation.
void OnURLFetchComplete(const net::URLFetcher* source) override;
net::URLRequestContextGetter* context_;
std::string cx_;
ScopedVector<Check> checks_in_progress_;
base::MRUCache<GURL, CheckResult> cache_;
DISALLOW_COPY_AND_ASSIGN(SupervisedUserAsyncURLChecker);
};
#endif // CHROME_BROWSER_SUPERVISED_USER_EXPERIMENTAL_SUPERVISED_USER_ASYNC_URL_CHECKER_H_
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