Allow additional request params

lib/onelogin/saml/authrequest.rb

@@ -5,7 +5,7 @@
 
 module Onelogin::Saml
   class Authrequest
-    def create(settings)
+    def create(settings, params = {})
       uuid = UUID.new.generate
       time = Time.now.strftime("%Y-%m-%dT%H:%M:%SZ")
 
@@ -20,8 +20,13 @@ def create(settings)
       deflated_request  = Zlib::Deflate.deflate(request, 9)[2..-5]
       base64_request    = Base64.encode64(deflated_request)
       encoded_request   = CGI.escape(base64_request)
+      request_params    = "?SAMLRequest=" + encoded_request
 
-      settings.idp_sso_target_url + "?SAMLRequest=" + encoded_request
+      params.each_pair do |key, value|
+        request_params << "&#{key}=#{CGI.escape(value)}"
+      end
+
+      settings.idp_sso_target_url + request_params
     end
 
   end

test/ruby-saml_test.rb

@@ -77,6 +77,13 @@ class RubySamlTest < Test::Unit::TestCase
       assert auth_url =~ /^http:\/\/stuff\.com\?SAMLRequest=/
       payload = CGI.unescape(auth_url.split("=").last)
     end
+
+    should "accept extra parameters" do
+      settings = Onelogin::Saml::Settings.new
+      settings.idp_sso_target_url = "http://stuff.com"
+      auth_url = Onelogin::Saml::Authrequest.new.create(settings, { :hello => "there" })
+      assert auth_url =~ /&hello=there$/
+    end
   end
 
 end