CFLib.org – Common Function Library Project

Description:
This function generates a Hash value based off of the full URL including any URL variables and the remote user's IP address. You can use the URLCheckHash UDF to determine if the URL was changed.

Return Values:
Returns a string.

Example:

<cfset x = 2>
<cfset urlData="id=#X#&mode=display">
<cfoutput>
Hashed URL is:<br>
display.cfm?#URLHash(urlData)#
</cfoutput>

Parameters:

Full UDF Source:

<cfscript>
/**
 * URL Security tool to prevent a user from changing any part of a URL.
 * 
 * @param URLValue 	 The string to hash. 
 * @return Returns a string. 
 * @author John Bartlett (&#106;&#98;&#97;&#114;&#116;&#108;&#101;&#116;&#116;&#64;&#115;&#116;&#114;&#97;&#110;&#103;&#101;&#106;&#111;&#117;&#114;&#110;&#101;&#121;&#46;&#99;&#111;&#109;) 
 * @version 1, January 7, 2002 
 */
function URLHash(URLValue)
{
  var HashData =cgi.Server_Name & cgi.Remote_Addr & cgi.Script_Name & URLValue;
  return URLValue & "&hash=" & LCase(Hash(HashData));
}
</cfscript>