Page Speed Optimization Libraries  1.2.24.1
net/instaweb/http/public/external_url_fetcher.h
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00001 /*
00002  * Copyright 2010 Google Inc.
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *      http:///www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00019 
00020 #ifndef NET_INSTAWEB_HTTP_PUBLIC_EXTERNAL_URL_FETCHER_H_
00021 #define NET_INSTAWEB_HTTP_PUBLIC_EXTERNAL_URL_FETCHER_H_
00022 
00023 #include "net/instaweb/util/public/basictypes.h"
00024 #include "net/instaweb/util/public/string.h"
00025 #include "net/instaweb/util/public/string_util.h"
00026 #include "net/instaweb/http/public/url_fetcher.h"
00027 
00028 namespace net_instaweb {
00029 
00030 class MessageHandler;
00031 class RequestHeaders;
00032 class ResponseHeaders;
00033 class Writer;
00034 
00037 
00040 class ExternalUrlFetcher : public UrlFetcher {
00041  public:
00042   ExternalUrlFetcher() {}
00043   virtual ~ExternalUrlFetcher() {}
00044 
00047   virtual bool StreamingFetchUrl(const GoogleString& url,
00048                                  const RequestHeaders& request_headers,
00049                                  ResponseHeaders* response_headers,
00050                                  Writer* writer,
00051                                  MessageHandler* message_handler);
00052 
00053 
00055   static const char kDefaultUserAgent[];
00056 
00058   void set_binary(const GoogleString& binary);
00059 
00060 
00061  protected:
00064   virtual void AppendHeaders(const RequestHeaders& request_headers,
00065                              StringVector* escaped_headers);
00066 
00067   GoogleString binary_;
00068 
00069  private:
00070   virtual const char* GetFetchLabel() = 0;
00071 
00077   virtual GoogleString ConstructFetchCommand(
00078       const GoogleString& escaped_url,
00079       const char* user_agent,
00080       const StringVector& escaped_headers) = 0;
00081 
00082   DISALLOW_COPY_AND_ASSIGN(ExternalUrlFetcher);
00083 };
00084 
00085 }  
00086 
00087 #endif  ///< NET_INSTAWEB_HTTP_PUBLIC_EXTERNAL_URL_FETCHER_H_
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