# class ActionDispatch::Cookies

Cookies are read and written through ActionController#cookies.

The cookies being read are the ones received along with the request, the cookies being written will be sent out with the response. Reading a cookie does not get the cookie object itself back, just the value it holds.

Examples for writing:

    # Sets a simple session cookie.
    # This cookie will be deleted when the user's browser is closed.
    cookies[:user_name] = "david"

    # Assign an array of values to a cookie.
    cookies[:lat_lon] = [47.68, -122.37]

    # Sets a cookie that expires in 1 hour.
    cookies[:login] = { :value => "XJ-122", :expires => 1.hour.from_now }

    # Sets a signed cookie, which prevents a user from tampering with its value.
    # The cookie is signed by your app's <tt>config.secret_token</tt> value.
    # Rails generates this value by default when you create a new Rails app.
    cookies.signed[:user_id] = current_user.id

    # Sets a "permanent" cookie (which expires in 20 years from now).
    cookies.permanent[:login] = "XJ-122"

    # You can also chain these methods:
    cookies.permanent.signed[:login] = "XJ-122"

Examples for reading:

    cookies[:user_name] # => "david"
    cookies.size        # => 2
    cookies[:lat_lon]   # => [47.68, -122.37]

Example for deleting:

    cookies.delete :user_name

Please note that if you specify a :domain when setting a cookie, you must also specify the domain when deleting the cookie:

    cookies[:key] = {
      :value => 'a yummy cookie',
      :expires => 1.year.from_now,
      :domain => 'domain.com'
    }

    cookies.delete(:key, :domain => 'domain.com')

The option symbols for setting cookies are:

- `:value` - The cookie's value or list of values (as an array).

- `:path` - The path for which this cookie applies. Defaults to the root of the application.

- `:domain` - The domain for which this cookie applies so you can restrict to the domain level. If you use a schema like www.example.com and want to share session with user.example.com set `:domain` to `:all`. Make sure to specify the `:domain` option with `:all` again when deleting keys.

      :domain => nil  # Does not sets cookie domain. (default)
      :domain => :all # Allow the cookie for the top most level
                        domain and subdomains.

- `:expires` - The time at which this cookie expires, as a Time object.

- `:secure` - Whether this cookie is a only transmitted to HTTPS servers. Default is `false`.

- `:httponly` - Whether this cookie is accessible via scripting or only HTTP. Defaults to `false`.

### Constants

HTTP_HEADER
TOKEN_KEY

### Public Class Methods

new(app) click to toggle source

    # File lib/action_dispatch/middleware/cookies.rb, line 335
    def initialize(app)
      @app = app
    end

### Public Instance Methods

call(env) click to toggle source

    # File lib/action_dispatch/middleware/cookies.rb, line 339
    def call(env)
      cookie_jar = nil
      status, headers, body = @app.call(env)

      if cookie_jar = env['action_dispatch.cookies']
        cookie_jar.write(headers)
        if headers[HTTP_HEADER].respond_to?(:join)
          headers[HTTP_HEADER] = headers[HTTP_HEADER].join("\n")
        end
      end

      [status, headers, body]
    end