Class: Rack::AcceptFormat

Inherits:
Object
  • Object
show all
Defined in:
lib/rack/contrib/accept_format.rb

Overview

A Rack middleware for automatically adding a format token at the end of the request path when there is none. It can detect formats passed in the HTTP_ACCEPT header to populate this token.

e.g.:

GET /some/resource HTTP/1.1
Accept: application/json

->

GET /some/resource.json HTTP/1.1
Accept: application/json

You can add custom types with this kind of function (taken from sinatra):

def mime(ext, type)
  ext = ".#{ext}" unless ext.to_s[0] == ?.
  Rack::Mime::MIME_TYPES[ext.to_s] = type
end

and then:

mime :json, 'application/json'

Note: it does not take into account multiple media types in the Accept header. The first media type takes precedence over all the others.

MIT-License - Cyril Rohr

Instance Method Summary collapse

Constructor Details

#initialize(app, default_extention = '.html') ⇒ AcceptFormat

Returns a new instance of AcceptFormat.



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# File 'lib/rack/contrib/accept_format.rb', line 28

def initialize(app, default_extention = '.html')
  @ext = default_extention.to_s.strip
  @ext = ".#{@ext}" unless @ext[0] == ?.
  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/rack/contrib/accept_format.rb', line 34

def call(env)
  req = Rack::Request.new(env)

  if ::File.extname(req.path_info).empty?
    accept = env['HTTP_ACCEPT'].to_s.scan(/[^;,\s]*\/[^;,\s]*/)[0].to_s
    extension =  Rack::Mime::MIME_TYPES.invert[accept] || @ext
    req.path_info = req.path_info+"#{extension}"
  end

  @app.call(env)
end