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 :text => post.to_ics, :mime_type => Mime::Type["text/calendar"]  }
      format.xml { render :xml => @people.to_xml }
    end
  end
end

Instance Attribute Summary (collapse)

Class Method Summary (collapse)

Instance Method Summary (collapse)

Constructor Details

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

A new instance of Type



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

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

- (Object) method_missing(method, *args) (private) 



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# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 216

def method_missing(method, *args)
  if method.to_s =~ /(\w+)\?$/
    $1.downcase.to_sym == to_sym
  else
    super
  end
end

Instance Attribute Details

- (Object) symbol (readonly)

Returns the value of attribute symbol



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# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 54

def symbol
  @symbol
end

Class Method Details

+ (Object) lookup(string) 



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# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 83

def lookup(string)
  LOOKUP[string]
end

+ (Object) lookup_by_extension(extension) 



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# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 87

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

+ (Object) parse(accept_header) 



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# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 106

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

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



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# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 97

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

+ (Object) 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.



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# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 93

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

Instance Method Details

- (Object) ==(mime_type) 



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# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 190

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

- (Object) ===(list) 



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

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

- (Object) =~(mime_type) 



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# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 197

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

- (Boolean) html?

Returns:

  • (Boolean) 


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

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

- (Object) to_s 



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# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 170

def to_s
  @string
end

- (Object) to_str 



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# File 'actionpack/lib/action_dispatch/http/mime_type.rb', line 174

def to_str
  to_s
end

- (Object) to_sym 



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

def to_sym
  @symbol || @string.to_sym
end

- (Boolean) verify_request?

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 'actionpack/lib/action_dispatch/http/mime_type.rb', line 207

def verify_request?
  @@browser_generated_types.include?(to_sym)
end