Module: Sinatra::RespondTo

Defined in:
lib/sinatra/respond_to.rb

Defined Under Namespace

Modules: Helpers Classes: MissingTemplate

Constant Summary collapse

SUPPORTED_ACCEPT_HEADERS =

Define all MIME types you want to support here. This conversion table will be used for auto-negotiation with browser in sinatra when no ‘format’ parameter is specified.

{
  :xml => [
    'text/xml',
    'application/xml'
  ],
  :html => [
    'text/html',
    'application/xhtml+xml'
  ],
  :json => [
    'application/json'
  ]
}

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.registered(app) ⇒ Object 



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# File 'lib/sinatra/respond_to.rb', line 59

def self.registered(app)

  app.helpers RespondTo::Helpers

  app.before do

    # Skip development error image and static content
    next if self.class.development? && request.path_info =~ %r{/__sinatra__/.*?.png}
    next if options.static? && options.public? && (request.get? || request.head?) && static_file?(request.path_info)

    # Remove extension from URI
    # Extension will be available as a 'extension' method (extension=='txt')
   
    extension request.path_info.match(/\.([^\.\/]+)$/).to_a.first

    # If ?format= is present, ignore all Accept negotiations because
    # we are not dealing with browser
    if request.params.has_key? 'format'
      format params['format'].to_sym
    end
    
    # Let's make a little exception here to handle
    # /api/instance_states[.gv/.png] calls
    if extension.eql?('gv')
      format :gv
    elsif extension.eql?('png')
      format :png
    end

    # Get Rack::Accept::Response object and find best possible
    # mime type to output.
    # This negotiation works fine with latest rest-client gem:
    #
    # RestClient.get 'http://localhost:3001/api', {:accept => :json } =>
    # 'application/json'
    # RestClient.get 'http://localhost:3001/api', {:accept => :xml } =>
    # 'application/xml'
    #
    # Also browsers like Firefox (3.6.x) and Chromium reporting
    # 'application/xml+xhtml' which is recognized as :html reponse
    # In browser you can force output using ?format=[format] parameter.

    rack_accept = env['rack-accept.request']

    if rack_accept.media_type.to_s.strip.eql?('Accept:')
      format :xml
    elsif is_chrome?
      format :html
    else
      format lookup_format_from_mime(rack_accept.best_media_type(accept_to_array))
    end

  end

  app.class_eval do

    # Simple helper to detect Chrome based browsers
    # which have screwed up they Accept headers.
    # Set HTML as default output format here
    def is_chrome?
      true if env['HTTP_USER_AGENT'] =~ /Chrome/
    end

    # This code was copied from respond_to plugin
    # http://github.com/cehoffman/sinatra-respond_to
    # MIT License
    alias :render_without_format :render
    def render(*args, &block)
      assumed_layout = args[1] == :layout
      args[1] = "#{args[1]}.#{format}".to_sym if args[1].is_a?(::Symbol)
      render_without_format *args, &block
    rescue Errno::ENOENT => e
      raise MissingTemplate, "#{args[1]}.#{args[0]}" unless assumed_layout
      raise e
    end
    private :render
  end

  # This code was copied from respond_to plugin
  # http://github.com/cehoffman/sinatra-respond_to
  app.configure :development do |dev|
    dev.error MissingTemplate do
      content_type :html, :charset => 'utf-8'
      response.status = request.env['sinatra.error'].code

      engine = request.env['sinatra.error'].message.split('.').last
      engine = 'haml' unless ['haml', 'builder', 'erb'].include? engine

      path = File.basename(request.path_info)
      path = "root" if path.nil? || path.empty?

      format = engine == 'builder' ? 'xml' : 'html'

      layout = case engine
               when 'haml' then "!!!\n%html\n  %body= yield"
               when 'erb' then "<html>\n  <body>\n    <%= yield %>\n  </body>\n</html>"
               end

      layout = "<small>app.#{format}.#{engine}</small>\n<pre>#{escape_html(layout)}</pre>"

      ("      <!DOCTYPE html>\n      <html>\n      <head>\n        <style type=\"text/css\">\n        body { text-align:center;font-family:helvetica,arial;font-size:22px;\n          color:#888;margin:20px}\n        #c {margin:0 auto;width:500px;text-align:left;}\n        small {float:right;clear:both;}\n        pre {clear:both;text-align:left;font-size:70%;width:500px;margin:0 auto;}\n        </style>\n      </head>\n      <body>\n        <h2>Sinatra can't find \#{request.env['sinatra.error'].message}</h2>\n        <img src='/__sinatra__/500.png'>\n        <pre>\#{request.env['sinatra.error'].backtrace.join(\"\\n\")}</pre>\n        <div id=\"c\">\n          <small>application.rb</small>\n          <pre>\#{request.request_method.downcase} '\#{request.path_info}' do\\n  respond_to do |wants|\\n    wants.\#{format} { \#{engine} :\#{path} }\\n  end\\nend</pre>\n        </div>\n      </body>\n      </html>\n      HTML\n    end\n\n  end\nend\n").gsub(/^ {10}/, '')

Instance Method Details

#accept_to_array ⇒ Object

We need to pass array of available response types to best_media_type method



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# File 'lib/sinatra/respond_to.rb', line 45

def accept_to_array
  SUPPORTED_ACCEPT_HEADERS.keys.collect do |key|
    SUPPORTED_ACCEPT_HEADERS[key]
  end.flatten
end

#lookup_format_from_mime(mime) ⇒ Object

Then, when we get best media type for response, we need to know which format to choose



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# File 'lib/sinatra/respond_to.rb', line 53

def lookup_format_from_mime(mime)
  SUPPORTED_ACCEPT_HEADERS.keys.each do |format|
    return format if SUPPORTED_ACCEPT_HEADERS[format].include?(mime)
  end
end