Class: Mime::Type

Inherits:
Object show all
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

Direct Known Subclasses

AllType

Defined Under Namespace

Classes: AcceptItem, AcceptList, InvalidMimeType

Constant Summary collapse

TRAILING_STAR_REGEXP = 
/^(text|application)\/\*/
PARAMETER_SEPARATOR_REGEXP = 
/;\s*\w+="?\w+"?/
MIME_NAME = 
"[a-zA-Z0-9][a-zA-Z0-9#{Regexp.escape('!#$&-^_.+')}]{0,126}"
MIME_PARAMETER_VALUE = 
"#{Regexp.escape('"')}?#{MIME_NAME}#{Regexp.escape('"')}?"
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 'actionpack/lib/action_dispatch/http/mime_type.rb', line 236

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 'actionpack/lib/action_dispatch/http/mime_type.rb', line 308

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 'actionpack/lib/action_dispatch/http/mime_type.rb', line 227

def hash
  @hash
end

#symbol ⇒ Object (readonly)

Returns the value of attribute symbol



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# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 65

def symbol
  @symbol
end

Class Method Details

.lookup(string) ⇒ Object 



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# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 144

def lookup(string)
  LOOKUP[string] || Type.new(string)
end

.lookup_by_extension(extension) ⇒ Object 



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# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 148

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

.parse(accept_header) ⇒ Object 



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

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.split(",").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 'actionpack/lib/action_dispatch/http/mime_type.rb', line 208

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 'actionpack/lib/action_dispatch/http/mime_type.rb', line 199

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 'actionpack/lib/action_dispatch/http/mime_type.rb', line 158

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 'actionpack/lib/action_dispatch/http/mime_type.rb', line 154

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

.register_callback(&block) ⇒ Object 



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# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 140

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 'actionpack/lib/action_dispatch/http/mime_type.rb', line 217

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

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 'actionpack/lib/action_dispatch/http/mime_type.rb', line 261

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 'actionpack/lib/action_dispatch/http/mime_type.rb', line 283

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 'actionpack/lib/action_dispatch/http/mime_type.rb', line 299

def all?; false; end

#eql?(other) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 276

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 'actionpack/lib/action_dispatch/http/mime_type.rb', line 295

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

#match?(mime_type) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 289

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 'actionpack/lib/action_dispatch/http/mime_type.rb', line 257

def ref
  symbol || to_s
end

#to_s ⇒ Object 



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# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 245

def to_s
  @string
end

#to_str ⇒ Object 



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# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 249

def to_str
  to_s
end

#to_sym ⇒ Object 



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# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 253

def to_sym
  @symbol
end