Page Speed Optimization Libraries  1.6.29.3
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_async_fetcher.h"
00027 
00028 namespace net_instaweb {
00029 
00030 class AsyncFetch;
00031 class MessageHandler;
00032 class RequestHeaders;
00033 
00036 
00039 class ExternalUrlFetcher : public UrlAsyncFetcher {
00040  public:
00041   ExternalUrlFetcher() {}
00042   virtual ~ExternalUrlFetcher() {}
00043 
00046   virtual void Fetch(const GoogleString& url,
00047                      MessageHandler* message_handler,
00048                      AsyncFetch* fetch);
00049 
00051   static const char kDefaultUserAgent[];
00052 
00054   void set_binary(const GoogleString& binary);
00055 
00056 
00057  protected:
00060   virtual void AppendHeaders(const RequestHeaders& request_headers,
00061                              StringVector* escaped_headers);
00062 
00063   GoogleString binary_;
00064 
00065  private:
00066   virtual const char* GetFetchLabel() = 0;
00067 
00073   virtual GoogleString ConstructFetchCommand(
00074       const GoogleString& escaped_url,
00075       const char* user_agent,
00076       const StringVector& escaped_headers) = 0;
00077 
00078   DISALLOW_COPY_AND_ASSIGN(ExternalUrlFetcher);
00079 };
00080 
00081 }  
00082 
00083 #endif  ///< NET_INSTAWEB_HTTP_PUBLIC_EXTERNAL_URL_FETCHER_H_
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