Contents

module Rack

  # A Rack middleware for providing JSON-P support.
  # 
  # Full credit to Flinn Mueller (http://actsasflinn.com/) for this contribution.
  # 
  class JSONP
  
    def initialize(app)
      @app = app
    end
  
    # Proxies the request to the application, stripping out the JSON-P callback
    # method and padding the response with the appropriate callback format.
    # 
    # Changes nothing if no <tt>callback</tt> param is specified.
    # 
    def call(env)
      status, headers, response = @app.call(env)
      request = Rack::Request.new(env)
      if request.params.include?('callback')
        response = pad(request.params.delete('callback'), response)
        headers['Content-Length'] = response.length.to_s
      end
      [status, headers, response]
    end
  
    # Pads the response with the appropriate callback format according to the
    # JSON-P spec/requirements.
    # 
    # The Rack response spec indicates that it should be enumerable. The method
    # of combining all of the data into a single string makes sense since JSON
    # is returned as a full string.
    # 
    def pad(callback, response, body = "")
      response.each{ |s| body << s }
      "#{callback}(#{body})"
    end
  
  end
end

Version data entries

8 entries across 8 versions & 1 rubygems

Version	Path
cryx-g5k-0.2.1	lib/g5k/rack/jsonp.rb
cryx-g5k-0.2.2	lib/g5k/rack/jsonp.rb
cryx-g5k-0.2.3	lib/g5k/rack/jsonp.rb
cryx-g5k-0.2.4	lib/g5k/rack/jsonp.rb
cryx-g5k-0.2.5	lib/g5k/rack/jsonp.rb
cryx-g5k-0.2.6	lib/g5k/rack/jsonp.rb
cryx-g5k-0.2.7	lib/g5k/rack/jsonp.rb
cryx-g5k-0.2.8	lib/g5k/rack/jsonp.rb