Adds :form option for custom form endpoints.

lib/omniauth/strategy.rb

@@ -177,13 +177,15 @@ module OmniAuth
     # Performs the steps necessary to run the request phase of a strategy.
     def request_call
       setup_phase
-      if response = call_through_to_app
-        response
+      if options.form.respond_to?(:call)
+        options.form.call(env)
+      elsif options.form
+        call_app!
       else
         if request.params['origin']
-          @env['rack.session']['omniauth.origin'] = request.params['origin']
+          env['rack.session']['omniauth.origin'] = request.params['origin']
         elsif env['HTTP_REFERER'] && !env['HTTP_REFERER'].match(/#{request_path}$/)
-          @env['rack.session']['omniauth.origin'] = env['HTTP_REFERER']
+          env['rack.session']['omniauth.origin'] = env['HTTP_REFERER']
         end
         request_phase
       end

spec/omniauth/strategy_spec.rb

@@ -353,18 +353,15 @@ describe OmniAuth::Strategy do
       end
     end
 
-    context 'pre-request call through' do
-      subject { ExampleStrategy.new(app) }
-      let(:app){ lambda{|env| env['omniauth.boom'] = true; [env['test.status'] || 404, {}, ['Whatev']] } }
-      it 'should be able to modify the env on the fly before the request_phase' do
-        lambda{ subject.call(make_env) }.should raise_error("Request Phase")
-        subject.response.status.should == 404
-        subject.last_env.should be_key('omniauth.boom')
+    context ':form option' do
+      it 'should call through to the supplied form option if one exists' do
+        strategy.options.form = lambda{|env| "Called me!"}
+        strategy.call(make_env('/auth/test')).should == "Called me!"
       end
 
-      it 'should call through to the app instead if a non-404 response is received' do
-        lambda{ subject.call(make_env('/auth/test', 'test.status' => 200)) }.should_not raise_error
-        subject.response.body.should == ['Whatev']
+      it 'should call through to the app if :form => true is set as an option' do
+        strategy.options.form = true
+        strategy.call(make_env('/auth/test')).should == app.call(make_env('/auth/test'))
       end
     end