campo-sirio/server/baseserv.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        BaseServ.cpp
// Purpose:     Simple base Server
// Author:      Guy
// Modified by:
// Created:     21/08/2002
// Copyright:   (c) 2002 Guy
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// ==========================================================================
// declarations
// ==========================================================================

// --------------------------------------------------------------------------
// headers
// --------------------------------------------------------------------------

#include "BaseServ.h"

#include <wx/config.h>
#include <wx/image.h>
#include <wx/mimetype.h>
#include <wx/sckstrm.h>
#include <wx/msw/iniconf.h> 

#include <wx/app.h>

///////////////////////////////////////////////////////////
// Utilities
///////////////////////////////////////////////////////////

TBaseServerApp& GetServerApp()
{
	return (TBaseServerApp&)*wxTheApp;
}

wxString Date2String(const wxDateTime& date)
{
	return date.Format("%d-%m-%Y");
}

wxDateTime String2Date(const wxString& str)
{
	int d, m, y;
	sscanf(str, "%d-%d-%d", &d, &m, &y);
	wxDateTime date(d, wxDateTime::Month(m-1), y);
	return date;
}

wxSocketBase& operator<<(wxSocketBase& outf, const wxChar* str)
{
	if (str && *str)
    outf.Write(str, wxStrlen(str));
	return outf;
}

wxSocketBase& operator<<(wxSocketBase& outf, wxString str)
{
	if (!str.IsEmpty())
    outf.Write(str, str.Length());
	return outf;
}

wxSocketBase& operator<<(wxSocketBase& outf, size_t num)
{
	return outf << wxString::Format("%u", num);
}

// --------------------------------------------------------------------------
// classes
// --------------------------------------------------------------------------

///////////////////////////////////////////////////////////
// THashTable
///////////////////////////////////////////////////////////

void THashTable::Put(const wxString& key, const wxString& value)
{
	THashString* entry = new THashString(value);
	m_Hash.Put(key, entry);
}

wxString THashTable::Get(const wxChar* key) const
{
	wxString strValue;
	THashString* str = (THashString*)m_Hash.Get(key);
	if (str != NULL)
		strValue = str->m_str;
	return strValue;
}

THashTable::THashTable(size_t size) : m_Hash(wxKEY_STRING, size) 
{ 
	m_Hash.DeleteContents(true); 
}

#ifdef WIN32

///////////////////////////////////////////////////////////
// TTaskbarIcon
///////////////////////////////////////////////////////////

BEGIN_EVENT_TABLE(TTaskBarIcon, wxTaskBarIcon)
  EVT_TASKBAR_LEFT_DOWN(TTaskBarIcon::OnTaskBarClick)
END_EVENT_TABLE()

void TTaskBarIcon::OnTaskBarClick(wxTaskBarIconEvent& e)
{
  wxString url;
  url << "http://127.0.0.1:" << GetServerApp().GetDefaultPort();
  ::ShellExecute(0, "open", url, NULL, NULL, SW_SHOWNORMAL);
}

void TTaskBarIcon::Init()
{
  const TBaseServerApp& a = GetServerApp();
  wxIcon icon;

  const wxString strIcon = a.GetConfigString("Icon");
  if (wxFileExists(strIcon))
  {
    wxInitAllImageHandlers();
    wxImage img(strIcon);
    img.Rescale(32,32);
    icon.CopyFromBitmap(img.ConvertToBitmap());
  }
  else
    icon.LoadFile("mondrian", wxBITMAP_TYPE_ICO_RESOURCE);

  SetIcon(icon, a.GetAppName());
}

#endif

///////////////////////////////////////////////////////////
// TBaseServerApp
///////////////////////////////////////////////////////////

enum 
{
  SERVER_ID = 1001,
  SOCKET_ID = 1002
};


BEGIN_EVENT_TABLE(TBaseServerApp, wxApp)
  EVT_SOCKET(SERVER_ID, TBaseServerApp::OnServerEvent)
  EVT_SOCKET(SOCKET_ID, TBaseServerApp::OnSocketEvent)
END_EVENT_TABLE()

void TBaseServerApp::WriteLog(const wxChar* str) const
{
	if (m_log != NULL)
	  *m_log << str << endl;
}

wxString TBaseServerApp::GetTempFilename()
{
	wxString strTmp;
	if (m_strTempDir.IsEmpty())
	{
    const wxString strPrefix = "Srv";
    ::wxGetTempFileName(strPrefix, strTmp);
		::wxRemoveFile(strTmp);
		(wxString&)m_strTempDir << ::wxPathOnly(strTmp) << "/";
	}
	strTmp = m_strTempDir;
  strTmp += wxString::Format("%s_%d.htm", GetAppName(), m_nTmpCounter);
  m_nTmpCounter++;
	if (m_nTmpCounter >= 4)
		m_nTmpCounter = 0;

	return strTmp;
}

TXmlItem& TBaseServerApp::AddLogo(TXmlItem& tr) const 
{
	TXmlItem& td = tr.AddChild("td");
	td.SetAttr("width", "15%");
	td.SetAttr("align", "center");
	
	TXmlItem& a = td.AddChild("a");
	a.SetAttr("href", "/index.htm");
  
	const wxString gif = GetConfigString("Icon", "euro.gif");
	TXmlItem& img = a.AddChild("img");
	img.SetAttr("src", gif);
	img.SetAttr("border", "0");
	img.SetAttr("alt", "Return to Home Page");
	
	return td;
}

TXmlItem& TBaseServerApp::CreatePageBody(TXmlItem& html, wxString header) const
{
  if (header.IsEmpty())
		header << GetAppName() << " Server";

	html.SetTag("html");
	
	TXmlItem& head = html.AddChild("head");
  TXmlItem& meta1 = head.AddChild("meta");
	meta1.SetAttr("name", "GENERATOR"); 
	meta1.SetAttr("content", GetAppName());
  TXmlItem& meta2 = head.AddChild("meta");
	meta2.SetAttr("HTTP-EQUIV", "Content-Type"); 
	meta2.SetAttr("content", "text/html; charset=iso-8859-1");
  head.AddChild("title") << header;

	TXmlItem& body = html.AddChild("body");
	body.SetAttr("bgcolor", "#EFCEAD");
	if (m_bRunning)
  	body.SetAttr("background", "back.gif");

	TXmlItem& title = body.AddChild("table");
	title.SetAttr("border", "5"); title.SetAttr("width", "100%");
	TXmlItem& title_tr = title.AddChild("tr");

	if (m_bRunning)
    AddLogo(title_tr);
  
	TXmlItem& td1 = title_tr.AddChild("td");
	td1.AddChild("h1").AddChild("center") << header;
	
	if (m_bRunning)
    AddLogo(title_tr);
  
	body.AddChild("br");
	return body;
}

TXmlItem& TBaseServerApp::AddLinkButton(TXmlItem& body, const wxChar* strCaption, const wxChar* strHref) const
{
  TXmlItem& table = body.AddChild("table");
	table.SetAttr("border", "2"); table.SetAttr("bgcolor", "#C0C0C0");

	TXmlItem& td = table.AddChild("tr").AddChild("td");
	td.SetAttr("align", "center");
	td.AddChild("a").SetAttr("href", strHref) << strCaption;
	
	return table;
}

void TBaseServerApp::MessageBox(const wxChar* caption, const wxChar* msg, wxSocketBase& outs)
{
  TXmlItem html; 
	TXmlItem& body = CreatePageBody(html); 

	TXmlItem& table = body.AddChild("center").AddChild("table");
	table.SetAttr("width", "70%"); table.SetAttr("border", "2");
	table.AddChild("caption").AddChild("h2") << caption;

	TXmlItem& td0 = table.AddChild("tr").AddChild("td");
	td0.SetAttr("align", "justify");
	td0.AddChild("h3") << msg;

	TXmlItem& td1 = table.AddChild("tr").AddChild("td");
	td1.SetAttr("align", "center");
	AddLinkButton(td1, "Return to main page", "index.htm");

	const wxString strTmp = GetTempFilename();
	html.Save(strTmp);
	SendFile(strTmp, outs);
}

bool TBaseServerApp::CanProcessCommand(wxString& cmd, wxSocketBase& outs)
{
	if (cmd.Find("stop.cgi") > 0)
	{
	  m_bRunning = false; // Disable gif on title
    MessageBox("Warning!", "Server Stopped", outs);
    ExitMainLoop();
		return false;
	}

	return true;
}

void TBaseServerApp::SendContent(wxFileInputStream& inf, wxSocketBase& sock)
{
	const size_t nSize = inf.GetSize();
	WriteLog(wxString::Format("Sending %u bytes", nSize));

	const size_t BUF_TEMP_SIZE = nSize;  // was 1024*16
  char* buf = new char[BUF_TEMP_SIZE];
  size_t bytes = BUF_TEMP_SIZE;
	size_t nTotalWritten = 0;
  while (bytes == BUF_TEMP_SIZE)
  {
    bytes = inf.Read(buf, bytes).LastRead();
    size_t nWritten = sock.Write(buf, bytes).LastCount();
		nTotalWritten += nWritten;
  }
	delete buf;

	if (nTotalWritten < nSize)
		WriteLog(wxString::Format("I sent %u on %u bytes only.", nTotalWritten, nSize));
}

void TBaseServerApp::SendFile(wxString strFilename, wxSocketBase& sock)
{
  const bool bFound = wxFileExists(strFilename);
	if (!bFound)
	{
		const wxString strTmp = GetTempFilename();
		if (!strTmp.IsEmpty())
		{
			TXmlItem html; 
			TXmlItem& body = CreatePageBody(html); 
			body.AddChild("h1") << "Sorry: File not found!";
			body.AddChild("br");
			body.AddChild("h2") << strFilename;
			html.Save(strTmp);
		}
 		strFilename = strTmp;
	}

	wxString strType;
	wxSplitPath(strFilename, NULL, NULL, &strType);
	wxFileType* type = wxTheMimeTypesManager->GetFileTypeFromExtension(strType);
	if (type != NULL)
		type->GetMimeType(&strType);
	else
		strType = "text/plain";
	const wxDateTime date = ::wxFileModificationTime(strFilename);

	wxFileInputStream inf(strFilename);
	const size_t nSize = inf.GetSize();

	if (bFound)
	  sock << "HTTP/1.1 200 OK\n";
	else
    sock << "HTTP/1.1 401 Not found\n";
	sock << "Server: " << GetAppName() << "\n";
	sock << "Host: " << wxGetFullHostName() << "\n";
	if (bFound && m_bRunning)
	  sock << "Connection: keep-alive\n";
	else
		sock << "Connection: close\n";
	sock << "Content-Type: " << strType << "\n";
 	sock << "Content-Length: " << nSize << "\n";
	sock << "Date: " << date.Format("%#c") << "\n";

  wxDateTime dtFraUnPo = wxDateTime::Now();
	const wxTimeSpan minuto(0, 1, 0);  // Zero ore, Un minuto, Zero secondi
	dtFraUnPo += minuto;
  sock << "Expires: " << dtFraUnPo.Format("%#c") << "\n";

  sock << "\n";

  SendContent(inf, sock);  
}

void TBaseServerApp::SendNotModifiedFile(wxSocketBase& sock)
{
	sock << "HTTP/1.1 304 Not Modified\n";
	sock << "Date: " << wxDateTime::Now().Format("%#c") << "\n";
  sock << "Server: " << GetAppName() << "\n";
  sock << "Connection: close\n";
}

const wxChar* TBaseServerApp::GetAppName() const
{
	// Pure virtual function
	return "Server";
}

void TBaseServerApp::ProcessCommand(wxString cmd, wxSocketBase& outs)
{
	// Pure virtual function
	WriteLog("Processing...");
	SendFile("index.htm", outs);
}

void TBaseServerApp::OnServerEvent(wxSocketEvent& event)
{
  wxString s = "--- OnServerEvent: ";

  switch(event.GetSocketEvent())
  {
    case wxSOCKET_CONNECTION : s.Append("wxSOCKET_CONNECTION"); break;
    default                  : s.Append("Unexpected event!"); break;
  }

  WriteLog(s);

  // Accept new connection if there is one in the pending
  // connections queue, else exit. We use Accept(FALSE) for
  // non-blocking accept (although if we got here, there
  // should ALWAYS be a pending connection).

  wxSocketBase* sock = m_server->Accept(FALSE);
  if (sock)
  {
    WriteLog("--- New client connection accepted");
  }
  else
  {
    WriteLog("### Error: couldn't accept a new connection");
    sock->Destroy();
    return;
  }

  sock->SetEventHandler(*this, SOCKET_ID);
  sock->SetNotify(wxSOCKET_INPUT_FLAG | wxSOCKET_LOST_FLAG);
  sock->Notify(TRUE);
}

void TBaseServerApp::OnSocketEvent(wxSocketEvent& event)
{
  wxSocketBase& sock = *event.GetSocket();
  switch(event.GetSocketEvent())
  {
    case wxSOCKET_INPUT:
    {
      // We disable input events, so that the test doesn't trigger
      // wxSocketEvent again.
      sock.SetNotify(wxSOCKET_LOST_FLAG);

			// Read the data
			const size_t BUFSIZE = 2048;
			wxString str;
			wxChar* bufStart = str.GetWriteBuf(BUFSIZE);
			memset(bufStart, 0, BUFSIZE);
			wxChar* buf = bufStart;

			const size_t len = sock.Read(buf, BUFSIZE).LastCount();
			buf += len;
			// Attendi la fine del comando HTTP!
      if (strncmp(bufStart, "GET ", 4) == 0 || strncmp(bufStart, "POST ", 5) == 0)
			{
				while (strstr(bufStart, "\r\n\r\n") == NULL)
				{
   				const size_t len = sock.Read(buf, BUFSIZE).LastCount();
					buf += len;
				}
			}
      str.UngetWriteBuf();
			
      WriteLog(str);

			if (CanProcessCommand(str, sock))
			{
				const wxSocketFlags flags = sock.GetFlags();
				sock.SetFlags(wxSOCKET_WAITALL);
			  ProcessCommand(str, sock);
				sock.SetFlags(flags);
			}

      // Enable input events again.
      sock.SetNotify(wxSOCKET_LOST_FLAG | wxSOCKET_INPUT_FLAG);
      break;
    }
    case wxSOCKET_LOST:
    {
      WriteLog("--- Deleting socket.");
      sock.Destroy();
      break;
    }
    default: ;
  }
}

const wxChar* TBaseServerApp::GetConfigName() const
{
	return "./servers.ini";
}

void TBaseServerApp::SetConfigString(const wxChar* key, const wxChar* val, const wxChar* app) const
{
  wxIniConfig ini("", "", GetConfigName());
	wxString str;
	if (app == NULL || *app == '\0')
		app = GetAppName();
	str << '/' << app;
	ini.SetPath(str);
	ini.Write(key, val);
}

void TBaseServerApp::SetConfigInt(const wxChar* key, int val, const wxChar* app) const
{
	wxString str = wxString::Format("%d", val);
  SetConfigString(key, str, app);
}

wxString TBaseServerApp::GetConfigString(const wxChar* key, const wxChar* def, const wxChar* app) const
{
  wxIniConfig ini("", "", GetConfigName());
	wxString str;
	if (app == NULL || *app == '\0')
		app = GetAppName();
	str << '/' << app;
	ini.SetPath(str);
	ini.Read(key, &str, def);
	return str;
}

int TBaseServerApp::GetConfigInt(const wxChar* key, int def, const wxChar* app) const
{
	wxString str = GetConfigString(key, "*", app);
	int val = def;
	if (str != "*")
		val = atoi(str);
	return val;
}

bool TBaseServerApp::GetConfigBool(const wxChar* key, bool def, const wxChar* app) const
{
	wxString str = GetConfigString(key, "*", app);
	bool val = def;
	if (str != "*")
		val = (str[0] == '1') || (str[0] == 'X') || (str[0] == 'Y');
	return val;
}

int TBaseServerApp::GetDefaultPort() const
{
	return GetConfigInt("Port", 3883);
}

wxString TBaseServerApp::GetLogFileName() const
{
  return GetConfigString("LogFile");
}

wxString TBaseServerApp::GetDocumentRoot() const
{
  return GetConfigString("DocumentRoot", ".");
}

bool TBaseServerApp::OnInit()
{
  m_server = NULL;
	m_log = NULL;

	m_SingleInstance = new wxSingleInstanceChecker(GetAppName());
  if (m_SingleInstance->IsAnotherRunning())
	{
		delete m_SingleInstance;
		m_SingleInstance = NULL;
		return false;
	}

  // Create the address - defaults to localhost:0 initially
  wxIPV4address addr;
  addr.Service(GetDefaultPort());
  // Create the socket
  m_server = new wxSocketServer(addr);

  // Create the Log file
	wxString str;
	
	str = GetLogFileName();
  if (!str.IsEmpty())
  	m_log = new wxFileOutputStream(str);
	else
		m_log = NULL;

	m_nTmpCounter = 0;
	
	// We use Ok() here to see if the server is really listening
  str.Empty();
  if (m_server->Ok())
  {
		// Setup the event handler and subscribe to connection events
		m_server->SetEventHandler(*this, SERVER_ID);
		m_server->SetNotify(wxSOCKET_CONNECTION_FLAG);
		m_server->Notify(TRUE);

		str << GetAppName() << " listening on port " << addr.Service();
		m_bRunning = true;
	}
  else
  {
		str << GetAppName() << " could not listen to port " << addr.Service();
  }
	WriteLog(str);

	bool ok = m_server->Ok();
	if (ok)
    ok = Initialization();

#ifdef WIN32
  if (ok) m_Tray.Init();
#endif

	return ok;
}

int TBaseServerApp::OnExit()
{
	if (m_server != NULL)
	{
    Deinitialization();
		delete m_SingleInstance;
  	delete m_server;
	}
	if (m_log != NULL)
	{
		wxString str;
		str << GetAppName() << " shutting down.";
		WriteLog(str);
	  delete m_log;
	}

	return wxApp::OnExit();
}

wxString TBaseServerApp::UnformatString(const wxString& strFormString) const
{
	wxString strResult;
	for (int i = 0; strFormString[i]; i++)
	{
		switch(strFormString[i])
		{
		case '+': 
			strResult += ' '; break;
		case '%':
			{
				const wxChar c = hex2int(strFormString.Mid(i+1, 2));
				strResult += c;
				i += 2;
			}
			break;
		default: 
			strResult += strFormString[i]; break;
		}
	}
	return strResult;
}

int TBaseServerApp::ParseArguments(wxString args, THashTable& hashArgs) const
{
  int uguale = args.Find('=');
	while (uguale > 0)
	{
		wxString name = args.Left(uguale); 
		name.Trim(false); name.Trim(true);
		
		wxString value;
		const int acapo = args.Find('&');
		if (acapo > uguale)
	    value = args.Mid(uguale+1, acapo-uguale-1); 
		else
			value = args.Mid(uguale+1); 
		value.Trim(false); value.Trim(true);
		hashArgs.Put(name, UnformatString(value));

		if (acapo > 0)
		{
      args = args.Mid(acapo+1);
			uguale = args.Find('=');
		}
		else
			uguale = -1;
	}
	return hashArgs.GetCount();
}