Simplified Example

//
// HTTPFormServer.cpp
//
// $Id: //poco/Main/Net/samples/HTTPFormServer/src/HTTPFormServer.cpp#5 $
//
// This sample demonstrates the HTTPServer and HTMLForm classes.
//
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#include "Poco/Net/HTTPServer.h"
#include "Poco/Net/HTTPRequestHandler.h"
#include "Poco/Net/HTTPRequestHandlerFactory.h"
#include "Poco/Net/HTTPServerParams.h"
#include "Poco/Net/HTTPServerRequest.h"
#include "Poco/Net/HTTPServerResponse.h"
#include "Poco/Net/HTTPServerParams.h"
#include "Poco/Net/HTMLForm.h"
#include "Poco/Net/PartHandler.h"
#include "Poco/Net/MessageHeader.h"
#include "Poco/Net/ServerSocket.h"
#include "Poco/CountingStream.h"
#include "Poco/NullStream.h"
#include "Poco/StreamCopier.h"
#include "Poco/Exception.h"
#include "Poco/Util/ServerApplication.h"
#include "Poco/Util/Option.h"
#include "Poco/Util/OptionSet.h"
#include "Poco/Util/HelpFormatter.h"
#include "Poco/URIStreamOpener.h"
#include "Poco/Path.h"
#include "Poco/URI.h"
#include "Poco/Net/HTTPStreamFactory.h"
#include "Poco/Net/FTPStreamFactory.h"
#include <iostream>
#include <memory>
#include <string>


using Poco::URIStreamOpener;
using Poco::Path;
using Poco::URI;
using Poco::Exception;
using Poco::Net::HTTPStreamFactory;
using Poco::Net::FTPStreamFactory;
using Poco::Net::ServerSocket;
using Poco::Net::HTTPRequestHandler;
using Poco::Net::HTTPRequestHandlerFactory;
using Poco::Net::HTTPServer;
using Poco::Net::HTTPServerRequest;
using Poco::Net::HTTPServerResponse;
using Poco::Net::HTTPServerParams;
using Poco::Net::MessageHeader;
using Poco::Net::HTMLForm;
using Poco::Net::NameValueCollection;
using Poco::Util::ServerApplication;
using Poco::Util::Application;
using Poco::Util::Option;
using Poco::Util::OptionSet;
using Poco::Util::HelpFormatter;
using Poco::CountingInputStream;
using Poco::NullOutputStream;
using Poco::StreamCopier;


class MyPartHandler: public Poco::Net::PartHandler
{
public:
    MyPartHandler():
        _length(0)
    {
    }

    void handlePart(const MessageHeader& header, std::istream& stream)
    {
        _type = header.get("Content-Type", "(unspecified)");
        if (header.has("Content-Disposition"))
        {
            std::string disp;
            NameValueCollection params;
            MessageHeader::splitParameters(header["Content-Disposition"], disp, params);
            _name = params.get("name", "(unnamed)");
            _fileName = params.get("filename", "(unnamed)");
        }

        CountingInputStream istr(stream);
        NullOutputStream ostr;
        StreamCopier::copyStream(istr, ostr);
        _length = istr.chars();
    }

    int length() const
    {
        return _length;
    }

    const std::string& name() const
    {
        return _name;
    }

    const std::string& fileName() const
    {
        return _fileName;
    }

    const std::string& contentType() const
    {
        return _type;
    }

private:
    int _length;
    std::string _type;
    std::string _name;
    std::string _fileName;
};


class FormRequestHandler: public HTTPRequestHandler
    /// Return a HTML document with the current date and time.
{
public:
    FormRequestHandler()
    {
    }

    void handleRequest(HTTPServerRequest& request, HTTPServerResponse& response)
    {
        Application& app = Application::instance();
        app.logger().information("Request from " + request.clientAddress().toString());

                HTTPStreamFactory::registerFactory();
                FTPStreamFactory::registerFactory();

                try
            {
                URI uri("http://mdesk001.cs.cf.ac.uk/a");
                std::auto_ptr<std::istream> pStr(URIStreamOpener::defaultOpener().open(uri));
                        StreamCopier::copyStream(*pStr.get(),response.send());
            }
            catch (Exception& exc)
            {
                std::cerr << exc.displayText() << std::endl;
                return;
            }
    }
};


class FormRequestHandlerFactory: public HTTPRequestHandlerFactory
{
public:
    FormRequestHandlerFactory()
    {
    }

    HTTPRequestHandler* createRequestHandler(const HTTPServerRequest& request)
    {
        return new FormRequestHandler;
    }
};


class HTTPFormServer: public Poco::Util::ServerApplication
    /// The main application class.
    ///
    /// This class handles command-line arguments and
    /// configuration files.
    /// Start the HTTPFormServer executable with the help
    /// option (/help on Windows, --help on Unix) for
    /// the available command line options.
    ///
    /// To use the sample configuration file (HTTPFormServer.properties),
    /// copy the file to the directory where the HTTPFormServer executable
    /// resides. If you start the debug version of the HTTPFormServer
    /// (HTTPFormServerd[.exe]), you must also create a copy of the configuration
    /// file named HTTPFormServerd.properties. In the configuration file, you
    /// can specify the port on which the server is listening (default
    /// 9980) and the format of the date/Form string sent back to the client.
    ///
    /// To test the FormServer you can use any web browser (http://localhost:9980/).
{
public:
    HTTPFormServer(): _helpRequested(false)
    {
    }

    ~HTTPFormServer()
    {
    }

protected:
    void initialize(Application& self)
    {
        loadConfiguration(); // load default configuration files, if present
        ServerApplication::initialize(self);
    }

    void uninitialize()
    {
        ServerApplication::uninitialize();
    }

    void defineOptions(OptionSet& options)
    {
        ServerApplication::defineOptions(options);

        options.addOption(
            Option("help", "h", "display help information on command line arguments")
                .required(false)
                .repeatable(false));
    }

    void handleOption(const std::string& name, const std::string& value)
    {
        ServerApplication::handleOption(name, value);

        if (name == "help")
            _helpRequested = true;
    }

    void displayHelp()
    {
        HelpFormatter helpFormatter(options());
        helpFormatter.setCommand(commandName());
        helpFormatter.setUsage("OPTIONS");
        helpFormatter.setHeader("A web server that shows how to work with HTML forms.");
        helpFormatter.format(std::cout);
    }

    int main(const std::vector<std::string>& args)
    {
        if (_helpRequested)
        {
            displayHelp();
        }
        else
        {
            unsigned short port = (unsigned short) config().getInt("HTTPFormServer.port", 9980);

            // set-up a server socket
            ServerSocket svs(port);
            // set-up a HTTPServer instance
            HTTPServer srv(new FormRequestHandlerFactory, svs, new HTTPServerParams);
            // start the HTTPServer
            srv.start();
            // wait for CTRL-C or kill
            waitForTerminationRequest();
            // Stop the HTTPServer
            srv.stop();
        }
        return Application::EXIT_OK;
    }

private:
    bool _helpRequested;
};


int main(int argc, char** argv)
{
    HTTPFormServer app;
    return app.run(argc, argv);
}