Module: OpenURI::Meta

Defined in:
lib/open-uri.rb

Overview

Mixin for holding meta-information.

Constant Summary collapse

RE_LWS =

:stopdoc:

/[\r\n\t ]+/n
RE_TOKEN = 
%r{[^\x00- ()<>@,;:\\"/\[\]?={}\x7f]+}n
RE_QUOTED_STRING = 
%r{"(?:[\r\n\t !#-\[\]-~\x80-\xff]|\\[\x00-\x7f])*"}n
RE_PARAMETERS = 
%r{(?:;#{RE_LWS}?#{RE_TOKEN}#{RE_LWS}?=#{RE_LWS}?(?:#{RE_TOKEN}|#{RE_QUOTED_STRING})#{RE_LWS}?)*}n

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#base_uri ⇒ Object

returns a URI that is the base of relative URIs in the data. It may differ from the URI supplied by a user due to redirection.



424
425
426
 
# File 'lib/open-uri.rb', line 424

def base_uri
  @base_uri
end

#meta ⇒ Object (readonly)

returns a Hash that represents header fields. The Hash keys are downcased for canonicalization.



428
429
430
 
# File 'lib/open-uri.rb', line 428

def meta
  @meta
end

#status ⇒ Object

returns an Array that consists of status code and message.



420
421
422
 
# File 'lib/open-uri.rb', line 420

def status
  @status
end

Class Method Details

.init(obj, src = nil) ⇒ Object

:nodoc:



404
405
406
407
408
409
410
411
412
413
414
415
416
417
 
# File 'lib/open-uri.rb', line 404

def Meta.init(obj, src=nil) # :nodoc:
  obj.extend Meta
  obj.instance_eval {
    @base_uri = nil
    @meta = {}
  }
  if src
    obj.status = src.status
    obj.base_uri = src.base_uri
    src.meta.each {|name, value|
      obj.meta_add_field(name, value)
    }
  end
end

Instance Method Details

#charset ⇒ Object

returns a charset parameter in Content-Type field. It is downcased for canonicalization.

If charset parameter is not given but a block is given, the block is called and its result is returned. It can be used to guess charset.

If charset parameter and block is not given, nil is returned except text type in HTTP. In that case, “iso-8859-1” is returned as defined by RFC2616 3.7.1.



508
509
510
511
512
513
514
515
516
517
518
519
520
 
# File 'lib/open-uri.rb', line 508

def charset
  type, *parameters = content_type_parse
  if pair = parameters.assoc('charset')
    pair.last.downcase
  elsif block_given?
    yield
  elsif type && %r{\Atext/} =~ type &&
        @base_uri && /\Ahttp\z/i =~ @base_uri.scheme
    "iso-8859-1" # RFC2616 3.7.1
  else
    nil
  end
end

#content_encoding ⇒ Object

returns a list of encodings in Content-Encoding field as an Array of String. The encodings are downcased for canonicalization.



525
526
527
528
529
530
531
532
 
# File 'lib/open-uri.rb', line 525

def content_encoding
  v = @meta['content-encoding']
  if v && %r{\A#{RE_LWS}?#{RE_TOKEN}#{RE_LWS}?(?:,#{RE_LWS}?#{RE_TOKEN}#{RE_LWS}?)*}o =~ v
    v.scan(RE_TOKEN).map {|content_coding| content_coding.downcase}
  else
    []
  end
end

#content_type ⇒ Object

returns “type/subtype” which is MIME Content-Type. It is downcased for canonicalization. Content-Type parameters are stripped.



493
494
495
496
 
# File 'lib/open-uri.rb', line 493

def content_type
  type, *_ = content_type_parse
  type || 'application/octet-stream'
end

#content_type_parse ⇒ Object

:startdoc:



471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
 
# File 'lib/open-uri.rb', line 471

def content_type_parse # :nodoc:
  v = @meta['content-type']
  # The last (?:;#{RE_LWS}?)? matches extra ";" which violates RFC2045.
  if v && %r{\A#{RE_LWS}?(#{RE_TOKEN})#{RE_LWS}?/(#{RE_TOKEN})#{RE_LWS}?(#{RE_PARAMETERS})(?:;#{RE_LWS}?)?\z}no =~ v
    type = $1.downcase
    subtype = $2.downcase
    parameters = []
    $3.scan(/;#{RE_LWS}?(#{RE_TOKEN})#{RE_LWS}?=#{RE_LWS}?(?:(#{RE_TOKEN})|(#{RE_QUOTED_STRING}))/no) {|att, val, qval|
      if qval
        val = qval[1...-1].gsub(/[\r\n\t !#-\[\]-~\x80-\xff]+|(\\[\x00-\x7f])/n) { $1 ? $1[1,1] : $& }
      end
      parameters << [att.downcase, val]
    }
    ["#{type}/#{subtype}", *parameters]
  else
    nil
  end
end

#last_modified ⇒ Object

returns a Time that represents the Last-Modified field.



456
457
458
459
460
461
462
 
# File 'lib/open-uri.rb', line 456

def last_modified
  if v = @meta['last-modified']
    Time.httpdate(v)
  else
    nil
  end
end

#meta_add_field(name, value) ⇒ Object

:nodoc:



449
450
451
452
453
 
# File 'lib/open-uri.rb', line 449

def meta_add_field(name, value) # :nodoc:
  name = name.downcase
  @meta[name] = value
  meta_setup_encoding if name == 'content-type'
end

#meta_setup_encoding ⇒ Object

:nodoc:



430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
 
# File 'lib/open-uri.rb', line 430

def meta_setup_encoding # :nodoc:
  charset = self.charset
  enc = nil
  if charset
    begin
      enc = Encoding.find(charset)
    rescue ArgumentError
    end
  end
  enc = Encoding::ASCII_8BIT unless enc
  if self.respond_to? :force_encoding
    self.force_encoding(enc)
  elsif self.respond_to? :string
    self.string.force_encoding(enc)
  else # Tempfile
    self.set_encoding enc
  end
end