Make it easy to check if Accept::Entry accepts given mime type

lib/travis/api/app/helpers/accept.rb

@@ -10,31 +10,29 @@ class Travis::Api::App
       class Entry
         SEPARATORS = Regexp.escape("()<>@,;:\/[]?={}\t ")
         TOKEN      = /[^#{SEPARATORS}]+/
-        attr_reader :type, :subtype, :quality, :params
+        attr_reader :type, :subtype, :quality, :version, :params
         def initialize(accept_string)
-          @type, @subtype, @quality, @params = parse(accept_string)
+          @type, @subtype, @quality, @version, @params = parse(accept_string)
         end
 
         def <=>(other)
-          [1 - quality, full_type.count('*'), 1 - params.size] <=>
-            [1 - other.quality, other.full_type.count('*'), 1 - other.params.size]
-        end
-
-        def full_type
-          "#{type}/#{subtype}"
+          [1 - quality, mime_type.count('*'), 1 - params.size] <=>
+            [1 - other.quality, other.mime_type.count('*'), 1 - other.params.size]
         end
 
         def mime_type
-          subtype = self.subtype =~ HEADER_FORMAT ? $2 : self.subtype
           "#{type}/#{subtype}"
         end
 
-        def version
-          $1 if subtype =~ HEADER_FORMAT
+        def accepts?(mime_type)
+          return true if self.mime_type == '*/*'
+
+          type, subtype = mime_type.scan(%r{(#{TOKEN})/(#{TOKEN})}).flatten
+          type == self.type && (self.subtype == '*' || subtype == self.subtype)
         end
 
         def to_s
-          str = "#{full_type}; q=#{quality}"
+          str = "#{mime_type}; q=#{quality}"
           str << "; #{params.map { |k,v| "#{k}=#{v}" }.join('; ')}" if params.length > 0
           str
         end
@@ -45,12 +43,19 @@ class Travis::Api::App
           # contain, only the simplest cases, no quoted strings etc.
           type, subtype, params = str.scan(%r{(#{TOKEN})/(#{TOKEN})(.*)}).flatten
           quality = 1
+
+          version = nil
           if params
             params = Hash[*params.split(';').map { |p| p.scan /(#{TOKEN})=(#{TOKEN})/ }.flatten]
             quality = params.delete('q').to_f if params['q']
           end
 
-          [type, subtype, quality, params]
+          if subtype =~ HEADER_FORMAT
+            subtype = $2
+            version = $1
+          end
+
+          [type, subtype, quality, version, params]
         end
       end
 
@@ -59,6 +64,14 @@ class Travis::Api::App
         entries.empty? ? [Entry.new('*/*')] : entries.sort
       end
 
+      def acceptable_formats
+        if format = env['travis.format_from_path']
+          [Entry.new(Rack::Mime.mime_type(".#{format}"))]
+        else
+          accept_entries
+        end
+      end
+
       def accept_version
         @accept_version ||= request.accept.join =~ HEADER_FORMAT && "v#{$1}" || DEFAULT_VERSION
       end

spec/unit/helpers/accept_spec.rb

@@ -9,7 +9,7 @@ module Travis::Api::App::Helpers
     it 'returns accept entries sorted properly' do
       accept = "text/html; q=0.2; level=1, application/vnd.travis-ci.2+json, text/*, text/html;level=2; q=0.5"
       FakeApp.new('HTTP_ACCEPT' => accept).accept_entries.map(&:to_s).should ==
-        ["application/vnd.travis-ci.2+json; q=1", "text/*; q=1", "text/html; q=0.5; level=2", "text/html; q=0.2; level=1"]
+        ["application/json; q=1", "text/*; q=1", "text/html; q=0.5; level=2", "text/html; q=0.2; level=1"]
     end
 
     it 'properly parses params, quality and version' do
@@ -25,5 +25,30 @@ module Travis::Api::App::Helpers
       accept_entry = FakeApp.new({}).accept_entries.first
       accept_entry.mime_type.should == '*/*'
     end
+
+    describe Accept::Entry do
+      describe 'accepts?' do
+        it 'accepts everything with */* type' do
+          entry = Accept::Entry.new('*/*')
+          entry.accepts?('application/json').should be_true
+          entry.accepts?('foo/bar').should be_true
+        end
+
+        it 'accepts every subtype with application/* type' do
+          entry = Accept::Entry.new('application/*')
+
+          entry.accepts?('application/foo').should be_true
+          entry.accepts?('application/bar').should be_true
+          entry.accepts?('text/plain').should be_false
+        end
+
+        it 'accepts when type and subtype match' do
+          entry = Accept::Entry.new('application/json')
+
+          entry.accepts?('application/json').should be_true
+          entry.accepts?('application/xml').should be_false
+        end
+      end
+    end
   end
 end