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module ActionDispatch
module Http
module MimeNegotiation
# The MIME type of the HTTP request, such as Mime::XML.
#
# For backward compatibility, the post \format is extracted from the
# X-Post-Data-Format HTTP header if present.
def content_type
@env["action_dispatch.request.content_type"] ||= begin
if @env['CONTENT_TYPE'] =~ /^([^,\;]*)/
Mime::Type.lookup($1.strip.downcase)
else
nil
end
end
end
# Returns the accepted MIME type for the request.
def accepts
@env["action_dispatch.request.accepts"] ||= begin
header = @env['HTTP_ACCEPT'].to_s.strip
if header.empty?
[content_type]
else
Mime::Type.parse(header)
end
end
end
# Returns the Mime type for the \format used in the request.
#
# GET /posts/5.xml | request.format => Mime::XML
# GET /posts/5.xhtml | request.format => Mime::HTML
# GET /posts/5 | request.format => Mime::HTML or MIME::JS, or request.accepts.first depending on the value of <tt>ActionController::Base.use_accept_header</tt>
#
def format(view_path = [])
formats.first
end
def formats
accept = @env['HTTP_ACCEPT']
@env["action_dispatch.request.formats"] ||=
if parameters[:format]
Array(Mime[parameters[:format]])
elsif xhr? || (accept && !accept.include?(?,))
accepts
else
[Mime::HTML]
end
end
# Sets the \format by string extension, which can be used to force custom formats
# that are not controlled by the extension.
#
# class ApplicationController < ActionController::Base
# before_filter :adjust_format_for_iphone
#
# private
# def adjust_format_for_iphone
# request.format = :iphone if request.env["HTTP_USER_AGENT"][/iPhone/]
# end
# end
def format=(extension)
parameters[:format] = extension.to_s
@env["action_dispatch.request.formats"] = [Mime::Type.lookup_by_extension(parameters[:format])]
end
# Returns a symbolized version of the <tt>:format</tt> parameter of the request.
# If no \format is given it returns <tt>:js</tt>for Ajax requests and <tt>:html</tt>
# otherwise.
def template_format
parameter_format = parameters[:format]
if parameter_format
parameter_format
elsif xhr?
:js
else
:html
end
end
# Receives an array of mimes and return the first user sent mime that
# matches the order array.
#
def negotiate_mime(order)
formats.each do |priority|
if priority == Mime::ALL
return order.first
elsif order.include?(priority)
return priority
end
end
order.include?(Mime::ALL) ? formats.first : nil
end
end
end
end
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