Page Speed Optimization Libraries
1.7.30.3
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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_