Added utlity to get a secret from a token string

src/main/java/org/gcube/common/authorization/utils/secret/SecretUtility.java

@@ -0,0 +1,17 @@
+package org.gcube.common.authorization.utils.secret;
+
+import java.util.regex.Pattern;
+
+public class SecretUtility {
+
+	public static final String UUID_REGEX = "^([a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}-[a-fA-F0-9]{8,9}){1}$";
+	
+	public static Secret getSecretByTokenString(String token) {
+		if(Pattern.matches(UUID_REGEX, token)) {
+			return new GCubeSecret(token);
+		}else {
+			return new JWTSecret(token);
+		}
+	}
+	
+}