got the hooks working, but insofar as testing anything other than just creating the hooks, I'll have to get to that later

lib/omniauth.rb

@@ -33,6 +33,9 @@ module OmniAuth
       :camelizations => {},
       :path_prefix => '/auth',
       :on_failure => OmniAuth::FailureEndpoint,
+      :on_callback_hook =>Proc.new {|p|},
+      :on_options_hook=>Proc.new {|p| },
+      :on_request_hook=>Proc.new {|p| },
       :form_css => Form::DEFAULT_CSS,
       :test_mode => false,
       :logger => default_logger,
@@ -64,6 +67,31 @@ module OmniAuth
       end
     end
 
+    def on_callback_hook(&block)
+      if block_given?
+        @on_callback_hook = block
+      else
+        @on_callback_hook
+      end
+    end
+
+    def on_options_hook(&block)
+      if block_given?
+        @on_options_hook = block
+      else
+        @on_options_hook
+      end
+    end
+
+    def on_request_hook(&block)
+      if block_given?
+        @on_request_hook = block
+      else
+        @on_request_hook
+      end
+    end
+
+
     def add_mock(provider, mock={})
       # Stringify keys recursively one level.
       mock.keys.each do |key|
@@ -95,7 +123,7 @@ module OmniAuth
       self.camelizations[name.to_s] = camelized.to_s
     end
 
-    attr_writer :on_failure
+    attr_writer :on_failure, :on_callback_hook,:on_options_hook,:on_request_hook
     attr_accessor :path_prefix, :allowed_request_methods, :form_css, :test_mode, :mock_auth, :full_host, :camelizations, :logger
   end
 

lib/omniauth/builder.rb

@@ -21,6 +21,18 @@ module OmniAuth
       OmniAuth.config.on_failure = block
     end
 
+    def on_options_hook(&block)
+      OmniAuth.config.on_options_hook = block
+    end
+
+    def on_request_hook(&block)
+      OmniAuth.config.on_request_hook = block
+    end
+
+    def on_callback_hook(&block)
+      OmniAuth.config.on_callback_hook = block
+    end
+
     def configure(&block)
       OmniAuth.configure(&block)
     end

lib/omniauth/strategy.rb

@@ -186,6 +186,7 @@ module OmniAuth
 
     # Responds to an OPTIONS request.
     def options_call
+      OmniAuth.config.on_options_hook.call(self.env)
       verbs = OmniAuth.config.allowed_request_methods.map(&:to_s).map(&:upcase).join(', ')
       return [ 200, { 'Allow' => verbs }, [] ]
     end
@@ -196,6 +197,8 @@ module OmniAuth
 
       log :info, "Request phase initiated."
 
+      OmniAuth.config.on_request_hook.call(self.env)
+
       #store query params from the request url, extracted in the callback_phase
       session['omniauth.params'] = request.params
 
@@ -218,7 +221,7 @@ module OmniAuth
     # Performs the steps necessary to run the callback phase of a strategy.
     def callback_call
       setup_phase
-
+      OmniAuth.config.on_callback_hook.call(self.env)
       log :info, "Callback phase initiated."
       @env['omniauth.origin'] = session.delete('omniauth.origin')
       @env['omniauth.origin'] = nil if env['omniauth.origin'] == ''

spec/omniauth_spec.rb

@@ -54,6 +54,34 @@ describe OmniAuth do
 
       expect(OmniAuth.config.on_failure.call).to eq('yoyo')
     end
+
+    it "is able to set hook on option_call" do
+      OmniAuth.configure do |config|
+        config.on_options_hook do
+          'yoyo'
+        end
+      end
+      expect(OmniAuth.config.on_options_hook.call).to eq('yoyo')
+    end
+
+    it "is able to set hook on request_call" do
+      OmniAuth.configure do |config|
+        config.on_request_hook do
+          'heyhey'
+        end
+      end
+      expect(OmniAuth.config.on_request_hook.call).to eq('heyhey')
+    end
+
+    it "is able to set hook on callback_call" do
+      OmniAuth.configure do |config|
+        config.on_callback_hook do
+          'heyhey'
+        end
+      end
+      expect(OmniAuth.config.on_callback_hook.call).to eq('heyhey')
+    end
+
     describe "mock auth" do
       before do
         OmniAuth.config.add_mock(:facebook, :uid => '12345',:info=>{:name=>'Joe', :email=>'joe@example.com'})