Add isLogout function

Author: sgrampone

gamsaml20/src/main/java/com/genexus/saml20/Binding.java

@@ -1,5 +1,7 @@
 package com.genexus.saml20;
 
+import com.genexus.saml20.utils.SamlAssertionUtils;
+
 @SuppressWarnings("unused")
 public abstract class Binding {
 
@@ -22,4 +24,6 @@ static String logout(SamlParms parms, String relayState) {
 	abstract String getRoles(String name);
 
 	abstract String getLogoutAssertions();
+
+	abstract boolean isLogout();
 }

gamsaml20/src/main/java/com/genexus/saml20/PostBinding.java

@@ -65,5 +65,9 @@ public String getRoles(String name) {
 		return SamlAssertionUtils.getRoles(this.xmlDoc, name);
 	}
 
+	public boolean isLogout(){
+		return SamlAssertionUtils.isLogout(this.xmlDoc);
+	}
+
 	// EXTERNAL OBJECT PUBLIC METHODS  - END
 }

gamsaml20/src/main/java/com/genexus/saml20/RedirectBinding.java

@@ -99,6 +99,10 @@ public String getLoginAttribute(String name) {
 		return "";
 	}
 
+	public boolean isLogout(){
+		return SamlAssertionUtils.isLogout(this.xmlDoc);
+	}
+
 	// EXTERNAL OBJECT PUBLIC METHODS  - END
 
 	private boolean verifySignature_internal(String certPath, String certPass, String certAlias) {

gamsaml20/src/main/java/com/genexus/saml20/utils/SamlAssertionUtils.java

@@ -49,6 +49,10 @@ public static Document loadDocument(String xml) {
 		}
 	}
 
+	public static boolean isLogout(Document xmlDoc){
+		return xmlDoc.getDocumentElement().getLocalName().equals("LogoutResponse");
+	}
+
 	public static Document createLogoutRequest(String id, String issuer, String nameID, String sessionIndex, String destination) {
 		logger.trace("createLogoutRequest");