Sinatra::RespondWith

Sinatra::RespondWith

These extensions let Sinatra automatically choose what template to render or action to perform depending on the request’s Accept header.

Example:

# Without Sinatra::RespondWith
get '/' do
  data = { :name => 'example' }
  request.accept.each do |type|
    case type.to_s
    when 'text/html'
      halt haml(:index, :locals => data)
    when 'text/json'
      halt data.to_json
    when 'application/atom+xml'
      halt nokogiri(:'index.atom', :locals => data)
    when 'application/xml', 'text/xml'
      halt nokogiri(:'index.xml', :locals => data)
    when 'text/plain'
      halt 'just an example'
    end
  end
  error 406
end

# With Sinatra::RespondWith
get '/' do
  respond_with :index, :name => 'example' do |f|
    f.txt { 'just an example' }
  end
end

Both helper methods respond_to and respond_with let you define custom handlers like the one above for text/plain. respond_with additionally takes a template name and/or an object to offer the following default behavior:

Security

Since methods are triggered based on client input, this can lead to security issues (but not as severe as those might appear in the first place: keep in mind that only known file extensions are used). You should limit the possible formats you serve.

This is possible with the provides condition:

get '/', :provides => [:html, :json, :xml, :atom] do
  respond_with :index, :name => 'example'
end

However, since you have to set provides for every route, this extension adds an app global (class method) `respond_to`, that lets you define content types for all routes:

respond_to :html, :json, :xml, :atom
get('/a') { respond_with :index, :name => 'a' }
get('/b') { respond_with :index, :name => 'b' }

Custom Types

Use the on method for defining actions for custom types:

get '/' do
  respond_to do |f|
    f.xml { nokogiri :index }
    f.on('application/custom') { custom_action }
    f.on('text/*') { data.to_s }
    f.on('*/*') { "matches everything" }
  end
end

Definition order does not matter.

Constants

ENGINES

Public Instance Methods

mime_type(*) click to toggle source
# File lib/sinatra/respond_with.rb, line 194
def mime_type(*)
  result = super
  remap_extensions
  result
end
remap_extensions() click to toggle source
# File lib/sinatra/respond_with.rb, line 187
def remap_extensions
  ext_map.clear
  Rack::Mime::MIME_TYPES.each { |e,t| ext_map[t] << e[1..-1].to_sym }
  ext_map['text/javascript'] << 'js'
  ext_map['text/xml'] << 'xml'
end
rendering_method(engine) click to toggle source
# File lib/sinatra/respond_with.rb, line 211
def rendering_method(engine)
  return [engine] if Sinatra::Templates.method_defined? engine
  return [:mab] if engine.to_sym == :markaby
  [:render, :engine]
end
respond_to(*formats) click to toggle source
# File lib/sinatra/respond_with.rb, line 200
def respond_to(*formats)
  if formats.any?
    @respond_to ||= []
    @respond_to.concat formats
  elsif @respond_to.nil? and superclass.respond_to? :respond_to
    superclass.respond_to
  else
    @respond_to
  end
end

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