move providers to SwitchUser::Provider::ProviderName

fixes error raise by SwitchUserController#provider_class
autoload wasn't finding the constant Provider
Provider wasn't namespaced under SwitchUser, so it was poluting the namespace

app/controllers/switch_user_controller.rb

@@ -56,6 +56,6 @@ def provider
   end
 
   def provider_class
-    "Provider::#{SwitchUser.provider.to_s.classify}".constantize
+    "SwitchUser::Provider::#{SwitchUser.provider.to_s.classify}".constantize
   end
 end

lib/switch_user.rb

@@ -1,4 +1,4 @@
-require 'provider'
+require 'switch_user/provider'
 
 module SwitchUser
   if defined? Rails::Engine

lib/switch_user/provider.rb

@@ -0,0 +1,8 @@
+module SwitchUser
+  module Provider
+    autoload :Authlogic, "switch_user/provider/authlogic"
+    autoload :Devise, "switch_user/provider/devise"
+    autoload :RestfulAuthentication, "switch_user/provider/restful_authentication"
+    autoload :Sorcery, "switch_user/provider/sorcery"
+  end
+end

lib/switch_user/provider/authlogic.rb

@@ -0,0 +1,24 @@
+module SwitchUser
+  module Provider
+    class Authlogic
+      def initialize(controller)
+        @controller = controller
+      end
+
+      def login(user, scope = nil)
+        UserSession.create(user)
+      end
+
+      def logout(scope = nil)
+        @controller.current_user_session.destroy
+      end
+
+      def current_user(scope = nil)
+        result = UserSession.find
+        if result
+          result.record
+        end
+      end
+    end
+  end
+end

lib/switch_user/provider/devise.rb

@@ -0,0 +1,22 @@
+module SwitchUser
+  module Provider
+    class Devise
+      def initialize(controller)
+        @controller = controller
+        @warden = @controller.warden
+      end
+
+      def login(user, scope = nil)
+        @warden.set_user(user, :scope => scope)
+      end
+
+      def logout(scope = nil)
+        @warden.logout(scope)
+      end
+
+      def current_user(scope = nil)
+        @controller.current_user
+      end
+    end
+  end
+end

lib/switch_user/provider/restful_authentication.rb

@@ -0,0 +1,21 @@
+module SwitchUser
+  module Provider
+    class RestfulAuthentication
+      def initialize(controller)
+        @controller = controller
+      end
+
+      def login(user, scope = nil)
+        @controller.current_user = user
+      end
+
+      def logout(scope = nil)
+        @controller.logout_killing_session!
+      end
+
+      def current_user(scope = nil)
+        @controller.current_user
+      end
+    end
+  end
+end

lib/switch_user/provider/sorcery.rb

@@ -0,0 +1,21 @@
+module SwitchUser
+  module Provider
+    class Sorcery
+      def initialize(controller)
+        @controller = controller
+      end
+
+      def login(user, scope = nil)
+        @controller.auto_login(user)
+      end
+
+      def logout(scope = nil)
+        @controller.logout
+      end
+
+      def current_user(scope = nil)
+        @controller.current_user
+      end
+    end
+  end
+end