Subj : ISAPI newbie question
To   : borland.public.cpp.borlandcpp
From : "tim mackey" <tim@scootasp.net>
Date : Wed Jul 16 2003 03:45 am


hi folks, 
this is my first post here. 

i'm trying to do a simple ISAPI url rewriter using borland C++. i don't have delphi or Visual Studio 6. 

the main idea is that i want to redirect all urls to /content.aspx, except the content.aspx page itself of course. i want to insert a http header called 'ORIGINAL_URL' which contains the original url. i found code from msdn which i have modified and pasted below, but i'm having trouble locating header files for it. code below.

if there's any compile switches i should know about please let me know. i did manage to find the -WD switch for creating a DLL.

any help is greatly appreciated!
thanks
tim mackey. 


// URLRewrite.cpp - Implementation file for ISAPI URLRewrite Filter

#include "stdafx.h"
#include "URLRewrite.h"


// The one and only CWinApp object
// NOTE: You may remove this object if you alter your project to no
// longer use MFC in a DLL.

CWinApp theApp;




// The one and only CURLRewriteFilter object

CURLRewriteFilter theFilter;



// CURLRewriteFilter implementation

CURLRewriteFilter::CURLRewriteFilter()
{
}

CURLRewriteFilter::~CURLRewriteFilter()
{
}

BOOL CURLRewriteFilter::GetFilterVersion(PHTTP_FILTER_VERSION pVer)
{
 // Call default implementation for initialization
 CHttpFilter::GetFilterVersion(pVer);

 // Clear the flags set by base class
 pVer->dwFlags &= ~SF_NOTIFY_ORDER_MASK;

 // Set the flags we are interested in
 pVer->dwFlags |= SF_NOTIFY_SECURE_PORT | SF_NOTIFY_NONSECURE_PORT | SF_NOTIFY_PREPROC_HEADERS;

 // Set Priority
 pVer->dwFlags |= SF_NOTIFY_ORDER_LOW;

 // Load description string
 TCHAR sz[SF_MAX_FILTER_DESC_LEN+1];
 ISAPIVERIFY(::LoadString(AfxGetResourceHandle(),
   IDS_FILTER, sz, SF_MAX_FILTER_DESC_LEN));
 _tcscpy(pVer->lpszFilterDesc, sz);
 return TRUE;
}

const DWORD cnURLSize = 4096;
DWORD CURLRewriteFilter::OnPreprocHeaders(CHttpFilterContext* pfc, PHTTP_FILTER_PREPROC_HEADERS pHeaders) 
{
 // get the URL using the special "url" pseudoheader
 char lpszOriginalURL[cnURLSize], lpszNewUrl[cnURLSize];
 DWORD nURLSize = cnURLSize;
 
 if ((pHeaders->GetHeader(pfc->m_pFC, "url", lpszOriginalURL, &nURLSize))) {

         // don't apply the filter to content.aspx
         if (strnicmp(lpszOriginalURL, "content.aspx", sizeof("content.aspx") - 1))
             return CHttpFilter::OnPreprocHeaders(pfc, pHeaders);

  pHeaders->SetHeader(pfc->m_pFC, "ORIGINAL_URL:",  (char*)lpszOriginalURL);
  pHeaders->SetHeader(pfc->m_pFC, "url", "/content.aspx");
 }
 return CHttpFilter::OnPreprocHeaders(pfc, pHeaders);
}


// If your extension will not use MFC, you'll need this code to make
// sure the extension objects can find the resource handle for the
// module.  If you convert your extension to not be dependent on MFC,
// remove the comments around the following AfxGetResourceHandle()
// and DllMain() functions, as well as the g_hInstance global.

/*
static HINSTANCE g_hInstance;

HINSTANCE AFXISAPI AfxGetResourceHandle()
{
 return g_hInstance;
}

BOOL WINAPI DllMain(HINSTANCE hInst, ULONG ulReason,
     LPVOID lpReserved)
{
 if (ulReason == DLL_PROCESS_ATTACH)
 {
  g_hInstance = hInst;
 }

 return TRUE;
}

*/


-------------------------------
Tim Mackey
www.ScootASP.net // .NET web hosting
tim@scootasp.net
-------------------------------

.