Expose NameID Format on SloLogoutrequest

Equivalent to `name_id_format` (`nameid_format`) on `Response` class.

Author: jeffparsons

lib/onelogin/ruby-saml/slo_logoutrequest.rb

@@ -66,6 +66,18 @@ def name_id
 
       alias_method :nameid, :name_id
 
+      # @return [String] Gets the NameID Format of the Logout Request.
+      #
+      def name_id_format
+        @name_id_node ||= REXML::XPath.first(document, "/p:LogoutRequest/a:NameID", { "p" => PROTOCOL, "a" => ASSERTION })
+        @name_id_format ||=
+          if @name_id_node && @name_id_node.attribute("Format")
+            @name_id_node.attribute("Format").value
+          end
+      end
+
+      alias_method :nameid_format, :name_id_format
+
       # @return [String|nil] Gets the ID attribute from the Logout Request. if exists.
       #
       def id

test/logout_requests/slo_request.xml

@@ -1,4 +1,4 @@
 <samlp:LogoutRequest Version='2.0' ID='_c0348950-935b-0131-1060-782bcb56fcaa' xmlns:samlp='urn:oasis:names:tc:SAML:2.0:protocol' IssueInstant='2014-03-21T19:20:13'>
   <saml:Issuer xmlns:saml='urn:oasis:names:tc:SAML:2.0:assertion'>https://app.onelogin.com/saml/metadata/SOMEACCOUNT</saml:Issuer>
-  <saml:NameID xmlns:saml='urn:oasis:names:tc:SAML:2.0:assertion'>someone@example.org</saml:NameID>
+  <saml:NameID xmlns:saml='urn:oasis:names:tc:SAML:2.0:assertion' Format='urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress'>someone@example.org</saml:NameID>
 </samlp:LogoutRequest>

test/slo_logoutrequest_test.rb

@@ -91,6 +91,12 @@ class RubySamlTest < Minitest::Test
       end
     end
 
+    describe "#nameid_format" do
+      it "extract the format attribute of the name id element" do
+        assert_equal "urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress", logout_request.nameid_format
+      end
+    end
+
     describe "#issuer" do
       it "return the issuer inside the logout request" do
         assert_equal "https://app.onelogin.com/saml/metadata/SOMEACCOUNT", logout_request.issuer