Implement parsing msgpack parameter

Author: a2ikm

lib/msgpack_rails.rb

@@ -46,6 +46,16 @@ class Rails < ::Rails::Engine
             self.response_body = data.is_a?(String) ? data : data.to_msgpack(options)
           end
         end
+
+        parameter_parser = ->(raw_data) {
+          data = ActiveSupport::MessagePack.decode(raw_data)
+          data.is_a?(Hash) ? data : { _msgpack: data }
+        }
+        if ::Rails::VERSION::MAJOR >= 5
+          ActionDispatch::Request.parameter_parsers[Mime[:msgpack].symbol] = parameter_parser
+        else
+          ActionDispatch::ParamsParser::DEFAULT_PARSERS[Mime[:msgpack]] = parameter_parser
+        end
       end
     end
   end

test/msgpack_rails/fake_app.rb

@@ -11,5 +11,9 @@ class FakeApp < Rails::Application
 Rails.backtrace_cleaner.remove_silencers!
 Rails.application.initialize!
 
+FakeApp.routes.draw do
+  post ":controller/:action"
+end
+
 class ApplicationController < ActionController::Base
 end

test/msgpack_rails/parsing_parameter_test.rb

@@ -0,0 +1,39 @@
+require_relative "../test_helper"
+
+class ParsingParameterController < ApplicationController
+  def msgpack2json
+    render json: params[:contact]
+  end
+end
+
+class ParsingParameterTest < ActionDispatch::IntegrationTest
+  def test_parsing_msgpack_request
+    contact = Contact.new
+    contact.name = 'Konata Izumi'
+    contact.age = 16
+    contact.created_at = Time.utc(2006, 8, 1)
+    contact.awesome = true
+    contact.preferences = { 'shows' => 'anime' }
+
+    data = { :contact => contact }.to_msgpack
+
+    if ::Rails::VERSION::MAJOR >= 5
+      post "/parsing_parameter/msgpack2json.json",
+        params: data,
+        headers: { "Content-Type" => "application/msgpack" }
+    else
+      post "/parsing_parameter/msgpack2json.json",
+        data,
+        { "Content-Type" => "application/msgpack" }
+    end
+
+    assert_response :success
+
+    json = ActiveSupport::JSON.decode(response.body)
+    assert_equal contact.name, json['name']
+    assert_equal contact.age, json['age']
+    assert_equal contact.created_at, json['created_at'].to_time
+    assert_equal contact.awesome, json['awesome']
+    assert_equal(contact.preferences, json['preferences'])
+  end
+end