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Class: Mime::Type

Relationships & Source Files
Namespace Children
Exceptions:
InvalidMimeType
Extension / Inclusion / Inheritance Descendants
Subclasses:
AllType
Inherits: Object
Defined in: actionpack/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 body: @post.to_ics, mime_type: Mime::Type.lookup("text/calendar")  }
      format.xml { render xml: @post }
    end
  end
end

Constant Summary

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Constructor Details

.new(string, symbol = nil, synonyms = []) ⇒ Type

[ GitHub ] 

  


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



def initialize(string, symbol = nil, synonyms = [])
  unless MIME_REGEXP.match?(string)
    raise InvalidMimeType, "#{string.inspect} is not a valid MIME type"
  end
  @symbol, @synonyms = symbol, synonyms
  @string = string
  @hash = [@string, @synonyms, @symbol].hash
end


  







Dynamic Method Handling

  

    This class handles dynamic methods through the method_missing method




  

    #method_missing(method, *args)   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 332



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


  







Class Method Details



  

    .lookup(string)  
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 164



def lookup(string)
  return LOOKUP[string] if LOOKUP.key?(string)

  # fallback to the media-type without parameters if it was not found
  string = string.split(";", 2)[0]&.rstrip
  LOOKUP[string] || Type.new(string)
end


  








  

    .lookup_by_extension(extension)  
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 172



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


  








  

    .parse(accept_header)  
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 196



def parse(accept_header)
  if !accept_header.include?(",")
    if (index = accept_header.index(PARAMETER_SEPARATOR_REGEXP))
      accept_header = accept_header[0, index].strip
    end
    return [] if accept_header.blank?
    parse_trailing_star(accept_header) || Array(Mime::Type.lookup(accept_header))
  else
    list, index = [], 0
    accept_header.scan(ACCEPT_HEADER_REGEXP).each do |header|
      params, q = header.split(PARAMETER_SEPARATOR_REGEXP)

      next unless params
      params.strip!
      next if params.empty?

      params = parse_trailing_star(params) || [params]

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


  








  

    .parse_data_with_trailing_star(type)  
  



  

    

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]].


  



  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 232



def parse_data_with_trailing_star(type)
  Mime::SET.select { |m| m.match?(type) }
end


  








  

    .parse_trailing_star(accept_header)  
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 223



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)  
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 182



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

  SET << new_mime

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

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


  








  

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



  

    

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.


  



  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 178



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


  








  

    .register_callback(&block)  
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 160



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


  








  

    .unregister(symbol)  
  



  

    

This method is opposite of register method.



To unregister a MIME type:



Mime::Type.unregister(:mobile)


  



  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 241



def unregister(symbol)
  symbol = symbol.downcase
  if mime = Mime[symbol]
    SET.delete_if { |v| v.eql?(mime) }
    LOOKUP.delete_if { |_, v| v.eql?(mime) }
    EXTENSION_LOOKUP.delete_if { |_, v| v.eql?(mime) }
  end
end


  







Instance Attribute Details



  

    #all?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 323



def all?; false; end


  








  

    #hash   (readonly)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 251



attr_reader :hash


  








  

    #html?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 319



def html?
  (symbol == :html) || @string.include?("html")
end


  








  

    #symbol   (readonly)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 82



attr_reader :symbol


  







Instance Method Details



  

    #==(mime_type)  
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 293



def ==(mime_type)
  return false unless mime_type
  (@synonyms + [ self ]).any? do |synonym|
    synonym.to_s == mime_type.to_s || synonym.to_sym == mime_type.to_sym
  end
end


  








  

    #===(list)  
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 285



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


  








  

    #=~(mime_type)  
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 307



def =~(mime_type)
  return false unless mime_type
  regexp = Regexp.new(Regexp.quote(mime_type.to_s))
  @synonyms.any? { |synonym| synonym.to_s =~ regexp } || @string =~ regexp
end


  








  

    #eql?(other)  ⇒ Boolean 
  



  

    
  





  


  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 300



def eql?(other)
  super || (self.class == other.class &&
            @string    == other.string &&
            @synonyms  == other.synonyms &&
            @symbol    == other.symbol)
end


  








  

    #match?(mime_type)  ⇒ Boolean 
  



  

    
  





  


  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 313



def match?(mime_type)
  return false unless mime_type
  regexp = Regexp.new(Regexp.quote(mime_type.to_s))
  @synonyms.any? { |synonym| synonym.to_s.match?(regexp) } || @string.match?(regexp)
end


  








  

    #ref  
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 281



def ref
  symbol || to_s
end


  








  

    #to_s  
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 269



def to_s
  @string
end


  








  

    #to_str  
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 273



def to_str
  to_s
end


  








  

    #to_sym  
  

  [ GitHub ]


  

  


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



def to_sym
  @symbol
end