[FASTCGI] Cookie processing in Fast CGI

Martin Chapman chapmanm at pixia.com
Wed Dec 9 16:02:03 EST 2009


Tom,

It's a little ugly because it's COM and if you convert it to FastCGI it
would be cool if you posted it back for the rest of us if you can.  The
entire COM implementation is attached.

General Gist:

1. Get the cookie from the env vars.  Should be called HTTP_COOKIE.

2. Use a method like the one below to parse the cookie value.

STDMETHODIMP CCookie::ParseValue(BSTR sCookie)
{
	AFX_MANAGE_STATE(AfxGetStaticModuleState());

	_bstr_t bstrCookie(sCookie);
	if (bstrCookie.length() == 0)
		return E_INVALIDARG;

	CString strCookie = (TCHAR*) bstrCookie;
	LPCSTR pEnd = strCookie;
	LPCSTR pStart = strCookie;
	CString name, value;

	while (*pEnd != '\0')
	{
		while (*pEnd && *pEnd != '=' && *pEnd != '&')
			pEnd++;

		if (*pEnd == '\0' || *pEnd == '&')
		{
			if (pEnd > pStart)
			{
				CopyToCString(value, pStart, pEnd);
			}
			put_Value(_bstr_t(value.GetBuffer()));
			if (*pEnd == '&')
			{
				pEnd++;
				pStart = pEnd;
				continue;
			}
			return S_OK;
		}
		else if (*pEnd == '=' )
		{
			if (pEnd > pStart)
			{
				CopyToCString(name, pStart, pEnd);
			}
			else
			{
				pEnd++;
				pStart = pEnd;
				break;
			}

			pEnd++;
			pStart = pEnd;
			while (*pEnd && *pEnd != '&' && *pEnd != '=')
				pEnd++;
			if (pEnd > pStart)
				CopyToCString(value, pStart, pEnd);

			AddValue(_bstr_t(name.GetBuffer()),
_bstr_t(value.GetBuffer()));
			if (*pEnd != '\0')
				pEnd++;
			
			pStart = pEnd;
		}
	}
	
	return S_OK;
}

3. The following func parses a single cookie value and is used in the func
above.

STDMETHODIMP CCookie::ParseValue(BSTR sCookie)
{
	AFX_MANAGE_STATE(AfxGetStaticModuleState());

	_bstr_t bstrCookie(sCookie);
	if (bstrCookie.length() == 0)
		return E_INVALIDARG;

	CString strCookie = (TCHAR*) bstrCookie;
	LPCSTR pEnd = strCookie;
	LPCSTR pStart = strCookie;
	CString name, value;

	while (*pEnd != '\0')
	{
		while (*pEnd && *pEnd != '=' && *pEnd != '&')
			pEnd++;

		if (*pEnd == '\0' || *pEnd == '&')
		{
			if (pEnd > pStart)
			{
				CopyToCString(value, pStart, pEnd);
			}
			put_Value(_bstr_t(value.GetBuffer()));
			if (*pEnd == '&')
			{
				pEnd++;
				pStart = pEnd;
				continue;
			}
			return S_OK;
		}
		else 
		if (*pEnd == '=' )
		{
			if (pEnd > pStart)
			{
				CopyToCString(name, pStart, pEnd);
			}
			else
			{
				pEnd++;
				pStart = pEnd;
				break;
			}

			pEnd++;
			pStart = pEnd;
			while (*pEnd && *pEnd != '&' && *pEnd != '=')
				pEnd++;
			if (pEnd > pStart)
				CopyToCString(value, pStart, pEnd);

			AddValue(_bstr_t(name.GetBuffer()),
_bstr_t(value.GetBuffer()));
			if (*pEnd != '\0')
				pEnd++;
			
			pStart = pEnd;
		}
	}
	
	return S_OK;
}


-----Original Message-----
From: fastcgi-developers-bounces+chapmanm=pixia.com at mailman.fastcgi.com
[mailto:fastcgi-developers-bounces+chapmanm=pixia.com at mailman.fastcgi.com]
On Behalf Of Tom Bowden
Sent: Wednesday, December 09, 2009 1:18 PM
To: FastCGI Developers
Subject: [FASTCGI] Cookie processing in Fast CGI

Is there a thread somewhere that talks about parsing cookies - or, is  
this something that I have to treat like any other header parsing task.

Tom

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