Allow extension keys in Info Object (ruby-grape#588)

* Allow extension keys in Info Object, per http://swagger.io/specification/#infoObject

* address comments

- make rubocop happy
- add changelog entry
- add entry to extension section in the README

* fix changelog entry

* another changelog fix

CHANGELOG.md

@@ -3,6 +3,7 @@
 #### Features
 
 * [#583](https://github.com/ruby-grape/grape-swagger/pull/583): Issue #582: document file response - [@LeFnord](https://github.com/LeFnord).
+* [#588](https://github.com/ruby-grape/grape-swagger/pull/588): Allow extension keys in Info object - [@mattyr](https://github.com/mattyr).
 
 * Your contribution here.
 

README.md

@@ -858,11 +858,25 @@ end
 #### Extensions
 
 Swagger spec2.0 supports extensions on different levels, for the moment,
-the documentation on `verb`, `path` and `definition` level would be supported.
+the documentation on `info`, `verb`, `path` and `definition` level would be supported.
 The documented key would be generated from the `x` + `-` + key of the submitted hash,
 for possibilities refer to the [extensions spec](spec/lib/extensions_spec.rb).
 To get an overview *how* the extensions would be defined on grape level, see the following examples:
 
+- `info` extension, add a `x` key to the `info` hash when calling ```add_swagger_documentation```:
+```ruby
+  add_swagger_documentation \
+    info: {
+      x: { some: 'stuff' }
+    }
+```
+this would generate:
+```json
+"info":{
+  "x-some":"stuff"
+}
+```
+
 - `verb` extension, add a `x` key to the `desc` hash:
 ```ruby
 desc 'This returns something with extension on verb level',

lib/grape-swagger/doc_methods/extensions.rb

@@ -13,6 +13,10 @@ def add(path, definitions, route)
           add_extensions_to_definition(settings, path, definitions) if settings && extended?(settings, :x_def)
         end
 
+        def add_extensions_to_info(settings, info)
+          add_extension_to(info, extension(settings)) if extended?(settings, :x)
+        end
+
         def add_extensions_to_path(settings, path)
           add_extension_to(path, extension(settings, :x_path))
         end

lib/grape-swagger/endpoint.rb

@@ -35,14 +35,18 @@ def swagger_object(target_class, request, options)
 
     # building info object
     def info_object(infos)
-      {
+      result = {
         title:             infos[:title] || 'API title',
         description:       infos[:description],
         termsOfServiceUrl: infos[:terms_of_service_url],
         contact:           contact_object(infos),
         license:           license_object(infos),
         version:           infos[:version]
-      }.delete_if { |_, value| value.blank? }
+      }
+
+      GrapeSwagger::DocMethods::Extensions.add_extensions_to_info(infos, result)
+
+      result.delete_if { |_, value| value.blank? }
     end
 
     # sub-objects of info object

spec/swagger_v2/default_api_spec.rb

@@ -98,7 +98,10 @@ def app
           license: 'Apache 2',
           license_url: 'http://test.com',
           terms_of_service_url: 'http://terms.com',
-          contact_email: '[email protected]'
+          contact_email: '[email protected]',
+          x: {
+            logo: 'http://logo.com/img.png'
+          }
         }
       end
     end
@@ -131,5 +134,9 @@ def app
     it 'documents the contact email' do
       expect(subject['contact']['email']).to eql('[email protected]')
     end
+
+    it 'documents the extension field' do
+      expect(subject['x-logo']).to eql('http://logo.com/img.png')
+    end
   end
 end