/**
* Saxon: Safe when Using Bind Variables on XQuery Expression Example
* Proves that Saxon is safe from injection when using bind variables on the XQuery expression
*/
protected void Page_Load(object sender, EventArgs e)
{
bool expectedSafe = true;
try
{
// parse the XML
Processor processor = new Processor(false);
DocumentBuilder doc = processor.newDocumentBuilder();
XdmNode node = doc.build(new StreamSource(appPath + "/resources/students.xml"));
// query the XML
string query = "declare variable $name as xs:string external; " +
"for $s in //Students/Student " +
"where $s/FirstName = $name " +
"return $s"; // safe!
XQueryCompiler xqComp = processor.newXQueryCompiler();
XQueryExecutable xqExec = xqComp.compile(query);
XQueryEvaluator xqEval = xqExec.load();
xqEval.setContextItem(node);
xqEval.setExternalVariable(new QName("name"), new XdmAtomicValue(Request.QueryString["payload"]));
xqEval.evaluate();
// interpret the result of the query
List <string> resultList = new List <string>();
foreach (XdmValue value in xqEval)
{
resultList.Add(value.ToString());
}
// print the results on the query
PrintResults(expectedSafe, resultList);
}
catch (Exception ex)
{
Response.Write(ex.ToString());
}
}