PLearn 0.1
openUrl.cc
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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 :
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