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require 'set'
module Mime
SET = []
EXTENSION_LOOKUP = Hash.new { |h, k| h[k] = Type.new(k) unless k.blank? }
LOOKUP = Hash.new { |h, k| h[k] = Type.new(k) unless k.blank? }
# Encapsulates the notion of a mime type. Can be used at render time, for example, with:
#
# class PostsController < ActionController::Base
# def show
# @post = Post.find(params[:id])
#
# respond_to do |format|
# format.html
# format.ics { render :text => post.to_ics, :mime_type => Mime::Type["text/calendar"] }
# format.xml { render :xml => @people.to_xml }
# end
# end
# end
class Type
@@html_types = Set.new [:html, :url_encoded_form, :multipart_form, :all]
@@unverifiable_types = Set.new [:text, :json, :csv, :xml, :rss, :atom, :yaml]
cattr_reader :html_types, :unverifiable_types
# A simple helper class used in parsing the accept header
class AcceptItem #:nodoc:
attr_accessor :order, :name, :q
def initialize(order, name, q=nil)
@order = order
@name = name.strip
q ||= 0.0 if @name == Mime::ALL # default wilcard match to end of list
@q = ((q || 1.0).to_f * 100).to_i
end
def to_s
@name
end
def <=>(item)
result = item.q <=> q
result = order <=> item.order if result == 0
result
end
def ==(item)
name == (item.respond_to?(:name) ? item.name : item)
end
end
class << self
def lookup(string)
LOOKUP[string]
end
def lookup_by_extension(extension)
EXTENSION_LOOKUP[extension]
end
# Registers an alias that's not used on mime type lookup, but can be referenced directly. Especially useful for
# rendering different HTML versions depending on the user agent, like an iPhone.
def register_alias(string, symbol, extension_synonyms = [])
register(string, symbol, [], extension_synonyms, true)
end
def register(string, symbol, mime_type_synonyms = [], extension_synonyms = [], skip_lookup = false)
Mime.instance_eval { const_set symbol.to_s.upcase, Type.new(string, symbol, mime_type_synonyms) }
SET << Mime.const_get(symbol.to_s.upcase)
([string] + mime_type_synonyms).each { |string| LOOKUP[string] = SET.last } unless skip_lookup
([symbol.to_s] + extension_synonyms).each { |ext| EXTENSION_LOOKUP[ext] = SET.last }
end
def parse(accept_header)
if accept_header !~ /,/
[Mime::Type.lookup(accept_header)]
else
# keep track of creation order to keep the subsequent sort stable
list = []
accept_header.split(/,/).each_with_index do |header, index|
params, q = header.split(/;\s*q=/)
if params
params.strip!
list << AcceptItem.new(index, params, q) unless params.empty?
end
end
list.sort!
# Take care of the broken text/xml entry by renaming or deleting it
text_xml = list.index("text/xml")
app_xml = list.index(Mime::XML.to_s)
if text_xml && app_xml
# set the q value to the max of the two
list[app_xml].q = [list[text_xml].q, list[app_xml].q].max
# make sure app_xml is ahead of text_xml in the list
if app_xml > text_xml
list[app_xml], list[text_xml] = list[text_xml], list[app_xml]
app_xml, text_xml = text_xml, app_xml
end
# delete text_xml from the list
list.delete_at(text_xml)
elsif text_xml
list[text_xml].name = Mime::XML.to_s
end
# Look for more specific XML-based types and sort them ahead of app/xml
if app_xml
idx = app_xml
app_xml_type = list[app_xml]
while(idx < list.length)
type = list[idx]
break if type.q < app_xml_type.q
if type.name =~ /\+xml$/
list[app_xml], list[idx] = list[idx], list[app_xml]
app_xml = idx
end
idx += 1
end
end
list.map! { |i| Mime::Type.lookup(i.name) }.uniq!
list
end
end
end
def initialize(string, symbol = nil, synonyms = [])
@symbol, @synonyms = symbol, synonyms
@string = string
end
def to_s
@string
end
def to_str
to_s
end
def to_sym
@symbol || @string.to_sym
end
def ===(list)
if list.is_a?(Array)
(@synonyms + [ self ]).any? { |synonym| list.include?(synonym) }
else
super
end
end
def ==(mime_type)
return false if mime_type.blank?
(@synonyms + [ self ]).any? do |synonym|
synonym.to_s == mime_type.to_s || synonym.to_sym == mime_type.to_sym
end
end
# Returns true if Action Pack should check requests using this Mime Type for possible request forgery. See
# ActionController::RequestForgerProtection.
def verify_request?
html?
end
def html?
@@html_types.include?(to_sym) || @string =~ /html/
end
private
def method_missing(method, *args)
if method.to_s =~ /(\w+)\?$/
$1.downcase.to_sym == to_sym
else
super
end
end
end
end
require 'action_controller/mime_types'
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