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// Copyright (c) 2011 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 NET_URL_REQUEST_URL_REQUEST_FILTER_H_
#define NET_URL_REQUEST_URL_REQUEST_FILTER_H_
#include <map>
#include <string>
#include "base/containers/hash_tables.h"
#include "base/containers/scoped_ptr_hash_map.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "net/base/net_export.h"
#include "net/url_request/url_request_interceptor.h"
class GURL;
namespace net {
class URLRequest;
class URLRequestJob;
class URLRequestInterceptor;
// A class to help filter URLRequest jobs based on the URL of the request
// rather than just the scheme. Example usage:
//
// // Intercept "scheme://host/" requests.
// URLRequestFilter::GetInstance()->AddHostnameInterceptor(
// "scheme", "host", std::move(interceptor));
// // Add special handling for the URL http://foo.com/
// URLRequestFilter::GetInstance()->AddUrlInterceptor(
// GURL("http://foo.com/"), std::move(interceptor));
//
// The URLRequestFilter is implemented as a singleton that is not thread-safe,
// and hence must only be used in test code where the network stack is used
// from a single thread. It must only be accessed on that networking thread.
// One exception is that during startup, before any message loops have been
// created, interceptors may be added (the session restore tests rely on this).
// If the URLRequestFilter::MaybeInterceptRequest can't find a handler for a
// request, it returns NULL and lets the configured ProtocolHandler handle the
// request.
class NET_EXPORT URLRequestFilter : public URLRequestInterceptor {
public:
// Singleton instance for use.
static URLRequestFilter* GetInstance();
void AddHostnameInterceptor(
const std::string& scheme,
const std::string& hostname,
scoped_ptr<URLRequestInterceptor> interceptor);
void RemoveHostnameHandler(const std::string& scheme,
const std::string& hostname);
// Returns true if we successfully added the URL handler. This will replace
// old handlers for the URL if one existed.
bool AddUrlInterceptor(const GURL& url,
scoped_ptr<URLRequestInterceptor> interceptor);
void RemoveUrlHandler(const GURL& url);
// Clear all the existing URL handlers and unregister with the
// ProtocolFactory. Resets the hit count.
void ClearHandlers();
// Returns the number of times a handler was used to service a request.
int hit_count() const { return hit_count_; }
// URLRequestInterceptor implementation:
URLRequestJob* MaybeInterceptRequest(
URLRequest* request,
NetworkDelegate* network_delegate) const override;
private:
// scheme,hostname -> URLRequestInterceptor
using HostnameInterceptorMap = std::map<std::pair<std::string, std::string>,
scoped_ptr<URLRequestInterceptor>>;
// URL -> URLRequestInterceptor
using URLInterceptorMap =
base::ScopedPtrHashMap<std::string, scoped_ptr<URLRequestInterceptor>>;
URLRequestFilter();
~URLRequestFilter() override;
// Maps hostnames to interceptors. Hostnames take priority over URLs.
HostnameInterceptorMap hostname_interceptor_map_;
// Maps URLs to interceptors.
URLInterceptorMap url_interceptor_map_;
mutable int hit_count_;
// Singleton instance.
static URLRequestFilter* shared_instance_;
DISALLOW_COPY_AND_ASSIGN(URLRequestFilter);
};
} // namespace net
#endif // NET_URL_REQUEST_URL_REQUEST_FILTER_H_
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