Class: Mime::Type

Inherits:
Object
  • Object
show all
Defined in:
lib/action_dispatch/http/mime_type.rb

Overview

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 }
    end
  end
end

Defined Under Namespace

Classes: AcceptItem, AcceptList

Constant Summary collapse

TRAILING_STAR_REGEXP = 
/(text|application)\/\*/
PARAMETER_SEPARATOR_REGEXP = 
/;\s*\w+="?\w+"?/
@@html_types = 
Set.new [:html, :all]
@@browser_generated_types =

These are the content types which browsers can generate without using ajax, flash, etc i.e. following a link, getting an image or posting a form. CSRF protection only needs to protect against these types.

Set.new [:html, :url_encoded_form, :multipart_form, :text]

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(string, symbol = nil, synonyms = []) ⇒ Type

Returns a new instance of Type.



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# File 'lib/action_dispatch/http/mime_type.rb', line 231

def initialize(string, symbol = nil, synonyms = [])
  @symbol, @synonyms = symbol, synonyms
  @string = string
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args) ⇒ Object (private) 



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# File 'lib/action_dispatch/http/mime_type.rb', line 297

def method_missing(method, *args)
  if method.to_s.ends_with? '?'
    method[0..-2].downcase.to_sym == to_sym
  else
    super
  end
end

Instance Attribute Details

#symbol ⇒ Object (readonly)

Returns the value of attribute symbol.



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# File 'lib/action_dispatch/http/mime_type.rb', line 60

def symbol
  @symbol
end

Class Method Details

.browser_generated_types ⇒ Object 



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# File 'lib/action_dispatch/http/mime_type.rb', line 282

def self.browser_generated_types
  ActiveSupport::Deprecation.warn "Mime::Type.browser_generated_types is deprecated and will be removed in Rails 4.1"
  @@browser_generated_types
end

.lookup(string) ⇒ Object 



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# File 'lib/action_dispatch/http/mime_type.rb', line 151

def lookup(string)
  LOOKUP[string]
end

.lookup_by_extension(extension) ⇒ Object 



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# File 'lib/action_dispatch/http/mime_type.rb', line 155

def lookup_by_extension(extension)
  EXTENSION_LOOKUP[extension.to_s]
end

.parse(accept_header) ⇒ Object 



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# File 'lib/action_dispatch/http/mime_type.rb', line 179

def parse(accept_header)
  if accept_header !~ /,/
    accept_header = accept_header.split(PARAMETER_SEPARATOR_REGEXP).first
    parse_trailing_star(accept_header) || [Mime::Type.lookup(accept_header)].compact
  else
    list, index = AcceptList.new, 0
    accept_header.split(',').each do |header|
      params, q = header.split(PARAMETER_SEPARATOR_REGEXP)
      if params.present?
        params.strip!

        params = parse_trailing_star(params) || [params]

        params.each do |m|
          list << AcceptItem.new(index, m.to_s, q)
          index += 1
        end
      end
    end
    list.assort!
  end
end

.parse_data_with_trailing_star(input) ⇒ Object

For an input of 'text', returns [Mime::JSON, Mime::XML, Mime::ICS, Mime::HTML, Mime::CSS, Mime::CSV, Mime::JS, Mime::YAML, Mime::TEXT].

For an input of 'application', returns [Mime::HTML, Mime::JS, Mime::XML, Mime::YAML, Mime::ATOM, Mime::JSON, Mime::RSS, Mime::URL_ENCODED_FORM].



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# File 'lib/action_dispatch/http/mime_type.rb', line 211

def parse_data_with_trailing_star(input)
  Mime::SET.select { |m| m =~ input }
end

.parse_trailing_star(accept_header) ⇒ Object 



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# File 'lib/action_dispatch/http/mime_type.rb', line 202

def parse_trailing_star(accept_header)
  parse_data_with_trailing_star($1) if accept_header =~ TRAILING_STAR_REGEXP
end

.register(string, symbol, mime_type_synonyms = [], extension_synonyms = [], skip_lookup = false) ⇒ Object 



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# File 'lib/action_dispatch/http/mime_type.rb', line 165

def register(string, symbol, mime_type_synonyms = [], extension_synonyms = [], skip_lookup = false)
  Mime.const_set(symbol.upcase, Type.new(string, symbol, mime_type_synonyms))

  new_mime = Mime.const_get(symbol.upcase)
  SET << new_mime

  ([string] + mime_type_synonyms).each { |str| LOOKUP[str] = SET.last } unless skip_lookup
  ([symbol] + extension_synonyms).each { |ext| EXTENSION_LOOKUP[ext.to_s] = SET.last }

  @register_callbacks.each do |callback|
    callback.call(new_mime)
  end
end

.register_alias(string, symbol, extension_synonyms = []) ⇒ Object

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.



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# File 'lib/action_dispatch/http/mime_type.rb', line 161

def register_alias(string, symbol, extension_synonyms = [])
  register(string, symbol, [], extension_synonyms, true)
end

.register_callback(&block) ⇒ Object 



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# File 'lib/action_dispatch/http/mime_type.rb', line 147

def register_callback(&block)
  @register_callbacks << block
end

.unregister(symbol) ⇒ Object

This method is opposite of register method.

Usage:

Mime::Type.unregister(:mobile)



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# File 'lib/action_dispatch/http/mime_type.rb', line 220

def unregister(symbol)
  symbol = symbol.upcase
  mime = Mime.const_get(symbol)
  Mime.instance_eval { remove_const(symbol) }

  SET.delete_if { |v| v.eql?(mime) }
  LOOKUP.delete_if { |_,v| v.eql?(mime) }
  EXTENSION_LOOKUP.delete_if { |_,v| v.eql?(mime) }
end

Instance Method Details

#==(mime_type) ⇒ Object 



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# File 'lib/action_dispatch/http/mime_type.rb', line 260

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

#===(list) ⇒ Object 



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# File 'lib/action_dispatch/http/mime_type.rb', line 252

def ===(list)
  if list.is_a?(Array)
    (@synonyms + [ self ]).any? { |synonym| list.include?(synonym) }
  else
    super
  end
end

#=~(mime_type) ⇒ Object 



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# File 'lib/action_dispatch/http/mime_type.rb', line 267

def =~(mime_type)
  return false if mime_type.blank?
  regexp = Regexp.new(Regexp.quote(mime_type.to_s))
  (@synonyms + [ self ]).any? do |synonym|
    synonym.to_s =~ regexp
  end
end

#html? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/action_dispatch/http/mime_type.rb', line 287

def html?
  @@html_types.include?(to_sym) || @string =~ /html/
end

#ref ⇒ Object 



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# File 'lib/action_dispatch/http/mime_type.rb', line 248

def ref
  to_sym || to_s
end

#to_s ⇒ Object 



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# File 'lib/action_dispatch/http/mime_type.rb', line 236

def to_s
  @string
end

#to_str ⇒ Object 



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# File 'lib/action_dispatch/http/mime_type.rb', line 240

def to_str
  to_s
end

#to_sym ⇒ Object 



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# File 'lib/action_dispatch/http/mime_type.rb', line 244

def to_sym
  @symbol
end

#verify_request? ⇒ Boolean

Returns true if Action Pack should check requests using this Mime Type for possible request forgery. See ActionController::RequestForgeryProtection.

Returns:

  • (Boolean) 


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# File 'lib/action_dispatch/http/mime_type.rb', line 277

def verify_request?
  ActiveSupport::Deprecation.warn "Mime::Type#verify_request? is deprecated and will be removed in Rails 4.1"
  @@browser_generated_types.include?(to_sym)
end