Patch rack-accept to support all valid RFC6838 characters in media types

Author: suan

CHANGELOG.md

@@ -5,6 +5,7 @@
 
 * Your contribution here.
 
+* [#1179](https://github.com/ruby-grape/grape/pull/1179): Allow all RFC6838 valid characters in header vendor - [@suan](https://github.com/suan).
 * [#1170](https://github.com/ruby-grape/grape/pull/1170): Allow dashes and periods in header vendor - [@suan](https://github.com/suan).
 * [#1167](https://github.com/ruby-grape/grape/pull/1167): Convenience wrapper `type: File` for validating multipart file parameters - [@dslh](https://github.com/dslh).
 * [#1167](https://github.com/ruby-grape/grape/pull/1167): Refactor and extend coercion and type validation system - [@dslh](https://github.com/dslh).

README.md

@@ -339,9 +339,6 @@ vnd.vendor-and-or-resource-v1234+format
 ```
 
 Basically all tokens between the final `-` and the `+` will be interpreted as the version.
-Grape also only supports alphanumerics, periods, and dashes in the vendor/resource/version parts
-of the media type, even though [the appropriate RFC](http://tools.ietf.org/html/rfc6838#section-4.2)
-technically allows far more characters.
 
 Using this versioning strategy, clients should pass the desired version in the HTTP `Accept` head.
 

gemfiles/rails_3.gemfile

@@ -3,6 +3,7 @@
 source 'https://rubygems.org'
 
 gem 'rails', '3.2.19'
+gem 'rack-cache', '<= 1.2'  # Pin as next rack-cache version (1.3) removes Ruby1.9 support
 
 group :development, :test do
   gem 'rubocop', '~> 0.31.0'

lib/grape/middleware/versioner/header.rb

@@ -1,4 +1,5 @@
 require 'grape/middleware/base'
+require 'grape/middleware/versioner/parse_media_type_patch'
 
 module Grape
   module Middleware

lib/grape/middleware/versioner/parse_media_type_patch.rb

@@ -0,0 +1,20 @@
+module Rack
+  module Accept
+    module Header
+      class << self
+        # Corrected version of https://github.com/mjackson/rack-accept/blob/master/lib/rack/accept/header.rb#L40-L44
+        def parse_media_type(media_type)
+          # see http://tools.ietf.org/html/rfc6838#section-4.2 for allowed characters in media type names
+          m = media_type.to_s.match(%r{^([a-z*]+)\/([a-z0-9*\&\^\-_#\$!.+]+)(?:;([a-z0-9=;]+))?$})
+          m ? [m[1], m[2], m[3] || ''] : []
+        end
+      end
+    end
+
+    class MediaType
+      def parse_media_type(media_type)
+        Header.parse_media_type(media_type)
+      end
+    end
+  end
+end

spec/grape/middleware/versioner/header_spec.rb

@@ -261,8 +261,8 @@
 
     let(:v1_app) {
       Class.new(Grape::API) do
-        version 'v1', using: :header, vendor: 'test.a-cool-resource'
-        content_type :v1_test, 'application/vnd.test.a-cool-resource-v1+json'
+        version 'v1', using: :header, vendor: 'test.a-cool_resource', cascade: false, strict: true
+        content_type :v1_test, 'application/vnd.test.a-cool_resource-v1+json'
         formatter :v1_test, ->(object, _) { object }
         format :v1_test
 
@@ -276,8 +276,8 @@
 
     let(:v2_app) {
       Class.new(Grape::API) do
-        version 'v2', using: :header, vendor: 'test.a-cool-resource'
-        content_type :v2_test, 'application/vnd.test.a-cool-resource-v2+json'
+        version 'v2', using: :header, vendor: 'test.a-cool_resource', strict: true
+        content_type :v2_test, 'application/vnd.test.a-cool_resource-v2+json'
         formatter :v2_test, ->(object, _) { object }
         format :v2_test
 
@@ -290,20 +290,20 @@
     }
 
     def app
-      subject.mount v1_app
       subject.mount v2_app
+      subject.mount v1_app
       subject
     end
 
     context 'with header versioned endpoints and a rescue_all block defined' do
       it 'responds correctly to a v1 request' do
-        versioned_get '/users/hello', 'v1', using: :header, vendor: 'test.a-cool-resource'
+        versioned_get '/users/hello', 'v1', using: :header, vendor: 'test.a-cool_resource'
         expect(last_response.body).to eq('one')
         expect(last_response.body).not_to include('API vendor or version not found')
       end
 
       it 'responds correctly to a v2 request' do
-        versioned_get '/users/hello', 'v2', using: :header, vendor: 'test.a-cool-resource'
+        versioned_get '/users/hello', 'v2', using: :header, vendor: 'test.a-cool_resource'
         expect(last_response.body).to eq('two')
         expect(last_response.body).not_to include('API vendor or version not found')
       end