Add CSRF token to all the FORM submissions - spring-security

Question

I recently enabled CSRF protection in my web Application. There are around 100+ JSP pages containing FORM submission. What is the best way adding CSRF token :
<input type="hidden" name="${_csrf.parameterName}" value="${_csrf.token}"/>
such that all the form submission will have this form data. I don't want to add this parameter to every individual FORM submit.

Answer 1

So I've finally found a working solution. Basically I create a custom FormRenderer like this :
import com.sun.faces.renderkit.html_basic.FormRenderer;
import javax.el.ELContext;
import javax.el.ExpressionFactory;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import java.io.IOException;
public class FormWithCSRFRenderer extends FormRenderer {
#Override
public void encodeEnd(FacesContext context, UIComponent component) throws IOException {
log.debug("FormWithCSRFRenderer - Adding CSRF Token to form element");
ELContext elContext = context.getELContext();
ExpressionFactory expFactory = context.getApplication().getExpressionFactory();
ResponseWriter writer = context.getResponseWriter();
writer.startElement("input", component);
writer.writeAttribute("type", "hidden", null);
writer.writeAttribute("name", expFactory.createValueExpression(elContext, "${_csrf.parameterName}", String.class).getValue(elContext), null);
writer.writeAttribute("value", expFactory.createValueExpression(elContext, "${_csrf.token}", String.class).getValue(elContext), null);
writer.endElement("input");
writer.write("\n");
super.encodeEnd(context, component);
}
}
Then register it to override the FormRenderer by setting it in faces-config.xml :
<?xml version="1.0" encoding="UTF-8"?>
<faces-config xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-facesconfig_2_2.xsd"
version="2.2">
<render-kit>
<renderer>
<component-family>javax.faces.Form</component-family>
<renderer-type>javax.faces.Form</renderer-type>
<renderer-class>com.acme.FormWithCSRFRenderer</renderer-class>
</renderer>
</render-kit>
</faces-config>
I've tried to create a Component then add it as children but it wouldn't let me set the name of the input correctly so I directly write it.