src/pagespeed/system/loopback_route_fetcher.h

// Copyright 2012 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Author: morlovich@google.com (Maksim Orlovich)
//
// This fetcher routes requests to hosts that are not explicitly mentioned in
// the DomainLawyer towards our own IP, as extracted from the incoming
// connection.

#ifndef PAGESPEED_SYSTEM_LOOPBACK_ROUTE_FETCHER_H_
#define PAGESPEED_SYSTEM_LOOPBACK_ROUTE_FETCHER_H_

#include "net/instaweb/http/public/url_async_fetcher.h"
#include "pagespeed/kernel/base/basictypes.h"
#include "pagespeed/kernel/base/string.h"

struct apr_sockaddr_t;

namespace net_instaweb {

class AsyncFetch;
class RewriteOptions;
class MessageHandler;

// See file comment.
class LoopbackRouteFetcher : public UrlAsyncFetcher {
 public:
  // Does not take ownership of anything. own_port is the port the incoming
  // request came in on, and own_ip is the same for the IP. If the
  // backend_fetcher does actual fetching (and is not merely simulating it for
  // testing purposes) it should be the Serf fetcher, as others may not direct
  // requests this class produces properly.
  // (As this fetcher may produce requests that need to connect to some IP
  //  but have a Host: and URL from somewhere else).
  LoopbackRouteFetcher(const RewriteOptions* options,
                       const GoogleString& own_ip,
                       int own_port,
                       UrlAsyncFetcher* backend_fetcher);
  virtual ~LoopbackRouteFetcher();

  virtual bool SupportsHttps() const {
    return backend_fetcher_->SupportsHttps();
  }

  virtual void Fetch(const GoogleString& url,
                     MessageHandler* message_handler,
                     AsyncFetch* fetch);

  // Returns true if the given address is an IPv4 or IPv6 loopback.
  static bool IsLoopbackAddr(const apr_sockaddr_t* addr);

 private:
  const RewriteOptions* const options_;
  GoogleString own_ip_;
  int own_port_;
  UrlAsyncFetcher* const backend_fetcher_;

  DISALLOW_COPY_AND_ASSIGN(LoopbackRouteFetcher);
};

}  // namespace net_instaweb

#endif  // PAGESPEED_SYSTEM_LOOPBACK_ROUTE_FETCHER_H_