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 body: @post.to_ics, mime_type: Mime::Type.lookup("text/calendar")  }
      format.xml { render xml: @post }
    end
  end
end

Direct Known Subclasses

AllType

Defined Under Namespace

Classes: AcceptItem, AcceptList, InvalidMimeType

Constant Summary collapse

TRAILING_STAR_REGEXP = 
/^(text|application)\/\*/
PARAMETER_SEPARATOR_REGEXP =

all media-type parameters need to be before the q-parameter www.rfc-editor.org/rfc/rfc7231#section-5.3.2

/\s*;\s*q="?/
ACCEPT_HEADER_REGEXP = 
/[^,\s"](?:[^,"]|"[^"]*")*/
MIME_NAME = 
"[a-zA-Z0-9][a-zA-Z0-9#{Regexp.escape('!#$&-^_.+')}]{0,126}"
MIME_PARAMETER_VALUE = 
"(?:#{MIME_NAME}|\"[^\"\r\\\\]*\")"
MIME_PARAMETER = 
"\s*;\s*#{MIME_NAME}(?:=#{MIME_PARAMETER_VALUE})?"
MIME_REGEXP = 
/\A(?:\*\/\*|#{MIME_NAME}\/(?:\*|#{MIME_NAME})(?>#{MIME_PARAMETER})*\s*)\z/

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 257

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) ⇒ Object (private) 



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# File 'lib/action_dispatch/http/mime_type.rb', line 329

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

Instance Attribute Details

#hash ⇒ Object (readonly)

Returns the value of attribute hash.



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

def hash
  @hash
end

#symbol ⇒ Object (readonly)

Returns the value of attribute symbol.



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

def symbol
  @symbol
end

Class Method Details

.lookup(string) ⇒ Object 



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

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

.lookup_by_extension(extension) ⇒ Object 



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# File 'lib/action_dispatch/http/mime_type.rb', line 169

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 193

def parse(accept_header)
  if !accept_header.include?(",")
    if (index = accept_header.index(PARAMETER_SEPARATOR_REGEXP))
      accept_header = accept_header[0, index]
    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) ⇒ 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 229

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

.parse_trailing_star(accept_header) ⇒ Object 



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

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 179

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 = []) ⇒ 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 175

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 160

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

.unregister(symbol) ⇒ Object

This method is opposite of register method.

To unregister a MIME type:

Mime::Type.unregister(:mobile)



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# File 'lib/action_dispatch/http/mime_type.rb', line 238

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 Method Details

#==(mime_type) ⇒ Object 



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# File 'lib/action_dispatch/http/mime_type.rb', line 290

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) ⇒ Object 



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

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 304

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

#all? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/action_dispatch/http/mime_type.rb', line 320

def all?; false; end

#eql?(other) ⇒ Boolean

Returns:

  • (Boolean) 


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

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

#html? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/action_dispatch/http/mime_type.rb', line 316

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

#match?(mime_type) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/action_dispatch/http/mime_type.rb', line 310

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 ⇒ Object 



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# File 'lib/action_dispatch/http/mime_type.rb', line 278

def ref
  symbol || to_s
end

#to_s ⇒ Object 



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# File 'lib/action_dispatch/http/mime_type.rb', line 266

def to_s
  @string
end

#to_str ⇒ Object 



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# File 'lib/action_dispatch/http/mime_type.rb', line 270

def to_str
  to_s
end

#to_sym ⇒ Object 



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# File 'lib/action_dispatch/http/mime_type.rb', line 274

def to_sym
  @symbol
end