Add initial version of msunet omniauth strategy

lib/omniauth/strategies/msunet.rb

+require 'omniauth-oauth2'
+
+module OmniAuth
+  module Strategies
+    class Msunet < OmniAuth::Strategies::OAuth2
+      option :client_options, {
+        :site => 'https://oauth.msu.edu',
+        :authorize_url => 'https://oauth.msu.edu/login/oauth/authorize',
+        :token_url => 'https://oauth.msu.edu/login/oauth/access_token'
+      }
+
+      def request_phase
+        super
+      end
+      
+      def authorize_params
+        super.tap do |params|
+          %w[scope client_options].each do |v|
+            if request.params[v]
+              params[v.to_sym] = request.params[v]
+            end
+          end
+        end
+      end
+
+      uid { raw_info['id'].to_s }
+
+      info do
+        {
+          'nickname' => raw_info['login'],
+          'email' => email,
+          'name' => raw_info['name'],
+        }
+      end
+
+      extra do
+        {:raw_info => raw_info}
+      end
+
+      def raw_info
+        access_token.options[:mode] = :query
+        @raw_info ||= access_token.get('user').parsed
+      end
+
+      def email
+         (raw_info['email'].nil? || raw_info['email'].empty?) ? primary_email : raw_info['email']
+      end
+
+      def primary_email
+        primary = emails.find{|i| i['primary'] }
+        primary && primary['email'] || emails.first && emails.first['email']
+      end
+
+      def email_access_allowed?
+        options['scope'] =~ /user/
+      end
+
+    end
+  end
+end
+
+OmniAuth.config.add_camelization 'msunet', 'Msunet'