PLearn 0.1
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00001 // -*- C++ -*- 00002 00003 // openUrl.cc 00004 // 00005 // Copyright (C) 2004 Pascal Vincent 00006 // Copyright (C) 2006 Olivier Delalleau 00007 // 00008 // Redistribution and use in source and binary forms, with or without 00009 // modification, are permitted provided that the following conditions are met: 00010 // 00011 // 1. Redistributions of source code must retain the above copyright 00012 // notice, this list of conditions and the following disclaimer. 00013 // 00014 // 2. Redistributions in binary form must reproduce the above copyright 00015 // notice, this list of conditions and the following disclaimer in the 00016 // documentation and/or other materials provided with the distribution. 00017 // 00018 // 3. The name of the authors may not be used to endorse or promote 00019 // products derived from this software without specific prior written 00020 // permission. 00021 // 00022 // THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR 00023 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 00024 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN 00025 // NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 00026 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 00027 // TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 00028 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 00029 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 00030 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00031 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00032 // 00033 // This file is part of the PLearn library. For more information on the PLearn 00034 // library, go to the PLearn Web site at www.plearn.org 00035 00036 /* ******************************************************* 00037 * $Id: openUrl.cc 6002 2006-07-11 19:47:36Z plearner $ 00038 ******************************************************* */ 00039 00040 // Authors: Olivier Delalleau, Pascal Vincent and Christian Hudon 00041 00045 #include "openUrl.h" 00046 #include <plearn/io/openSocket.h> 00047 00048 #define PL_LOG_MODULE_NAME "openUrl" 00049 #include <plearn/io/pl_log.h> 00050 00051 namespace PLearn { 00052 using namespace std; 00053 00055 // openUrl // 00057 PStream openUrl(const PPath& url, PStream::mode_t io_formatting) 00058 { 00059 // Connect to host. 00060 string hostname = url.hostname(); 00061 PStream sock = openSocket(hostname, 80, PStream::raw_ascii); 00062 // Ask for document. 00063 size_t path_start = url.find(hostname); 00064 string path_on_server = url.substr(path_start + hostname.size()); 00065 PLASSERT( !path_on_server.empty() ); 00066 string http_request = "GET " + path_on_server + " HTTP/1.0\n\n"; 00067 MODULE_LOG << "HTTP request to " << hostname << ": " << http_request 00068 << endl; 00069 sock.write(http_request); 00070 sock.flush(); 00071 // Get answer. 00072 string token; 00073 sock >> token; // HTTP/x.y type of document. 00074 sock >> token; // Return code. 00075 // The current code is very basic and not very forgiving: if the server 00076 // does not answer 200 (everything is ok), then an error is thrown. 00077 // Future improvements would include taking redirection codes into account. 00078 if (token != "200") 00079 PLERROR("In openUrl(%s) - Received return code %s instead of 200", 00080 url.c_str(), token.c_str()); 00081 while (!token.empty()) 00082 sock.getline(token); // Skip other headers. 00083 // Set the required IO formatting mode. 00084 sock.setMode(io_formatting); 00085 return sock; 00086 } 00087 00088 } // end of namespace PLearn 00089 00090 00091 /* 00092 Local Variables: 00093 mode:c++ 00094 c-basic-offset:4 00095 c-file-style:"stroustrup" 00096 c-file-offsets:((innamespace . 0)(inline-open . 0)) 00097 indent-tabs-mode:nil 00098 fill-column:79 00099 End: 00100 */ 00101 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :