aboutsummaryrefslogtreecommitdiffstats
path: root/actionpack/lib/action_controller/request.rb
blob: d793ade702fa69eadc3e5d63d6cad1938f7943d0 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
require 'tempfile'
require 'stringio'
require 'strscan'

require 'active_support/memoizable'

module ActionController
  # CgiRequest and TestRequest provide concrete implementations.
  class AbstractRequest
    extend ActiveSupport::Memoizable

    def self.relative_url_root=(*args)
      ActiveSupport::Deprecation.warn(
        "ActionController::AbstractRequest.relative_url_root= has been renamed." +
        "You can now set it with config.action_controller.relative_url_root=", caller)
    end

    HTTP_METHODS = %w(get head put post delete options)
    HTTP_METHOD_LOOKUP = HTTP_METHODS.inject({}) { |h, m| h[m] = h[m.upcase] = m.to_sym; h }

    # The hash of environment variables for this request,
    # such as { 'RAILS_ENV' => 'production' }.
    attr_reader :env

    # The true HTTP request method as a lowercase symbol, such as <tt>:get</tt>.
    # UnknownHttpMethod is raised for invalid methods not listed in ACCEPTED_HTTP_METHODS.
    def request_method
      method = @env['REQUEST_METHOD']
      method = parameters[:_method] if method == 'POST' && !parameters[:_method].blank?

      HTTP_METHOD_LOOKUP[method] || raise(UnknownHttpMethod, "#{method}, accepted HTTP methods are #{HTTP_METHODS.to_sentence}")
    end
    memoize :request_method

    # The HTTP request method as a lowercase symbol, such as <tt>:get</tt>.
    # Note, HEAD is returned as <tt>:get</tt> since the two are functionally
    # equivalent from the application's perspective.
    def method
      request_method == :head ? :get : request_method
    end

    # Is this a GET (or HEAD) request?  Equivalent to <tt>request.method == :get</tt>.
    def get?
      method == :get
    end

    # Is this a POST request?  Equivalent to <tt>request.method == :post</tt>.
    def post?
      request_method == :post
    end

    # Is this a PUT request?  Equivalent to <tt>request.method == :put</tt>.
    def put?
      request_method == :put
    end

    # Is this a DELETE request?  Equivalent to <tt>request.method == :delete</tt>.
    def delete?
      request_method == :delete
    end

    # Is this a HEAD request? <tt>request.method</tt> sees HEAD as <tt>:get</tt>,
    # so check the HTTP method directly.
    def head?
      request_method == :head
    end

    # Provides access to the request's HTTP headers, for example:
    #  request.headers["Content-Type"] # => "text/plain"
    def headers
      ActionController::Http::Headers.new(@env)
    end
    memoize :headers

    def content_length
      @env['CONTENT_LENGTH'].to_i
    end
    memoize :content_length

    # The MIME type of the HTTP request, such as Mime::XML.
    #
    # For backward compatibility, the post format is extracted from the
    # X-Post-Data-Format HTTP header if present.
    def content_type
      Mime::Type.lookup(content_type_without_parameters)
    end
    memoize :content_type

    # Returns the accepted MIME type for the request
    def accepts
      header = @env['HTTP_ACCEPT'].to_s.strip

      if header.empty?
        [content_type, Mime::ALL].compact
      else
        Mime::Type.parse(header)
      end
    end
    memoize :accepts

    def if_modified_since
      if since = env['HTTP_IF_MODIFIED_SINCE']
        Time.rfc2822(since) rescue nil
      end
    end
    memoize :if_modified_since

    def if_none_match
      env['HTTP_IF_NONE_MATCH']
    end

    def not_modified?(modified_at)
      if_modified_since && modified_at && if_modified_since >= modified_at
    end

    def etag_matches?(etag)
      if_none_match && if_none_match == etag
    end

    # Check response freshness (Last-Modified and ETag) against request
    # If-Modified-Since and If-None-Match conditions.
    def fresh?(response)
      not_modified?(response.last_modified) || etag_matches?(response.etag)
    end

    # Returns the Mime type for the format used in the request.
    #
    #   GET /posts/5.xml   | request.format => Mime::XML
    #   GET /posts/5.xhtml | request.format => Mime::HTML
    #   GET /posts/5       | request.format => Mime::HTML or MIME::JS, or request.accepts.first depending on the value of <tt>ActionController::Base.use_accept_header</tt>
    def format
      @format ||=
        if parameters[:format]
          Mime::Type.lookup_by_extension(parameters[:format])
        elsif ActionController::Base.use_accept_header
          accepts.first
        elsif xhr?
          Mime::Type.lookup_by_extension("js")
        else
          Mime::Type.lookup_by_extension("html")
        end
    end


    # Sets the format by string extension, which can be used to force custom formats that are not controlled by the extension.
    # Example:
    #
    #   class ApplicationController < ActionController::Base
    #     before_filter :adjust_format_for_iphone
    #
    #     private
    #       def adjust_format_for_iphone
    #         request.format = :iphone if request.env["HTTP_USER_AGENT"][/iPhone/]
    #       end
    #   end
    def format=(extension)
      parameters[:format] = extension.to_s
      @format = Mime::Type.lookup_by_extension(parameters[:format])
    end

    # Returns a symbolized version of the <tt>:format</tt> parameter of the request.
    # If no format is given it returns <tt>:js</tt>for AJAX requests and <tt>:html</tt>
    # otherwise.
    def template_format
      parameter_format = parameters[:format]

      if parameter_format
        parameter_format.to_sym
      elsif xhr?
        :js
      else
        :html
      end
    end

    def cache_format
      parameter_format = parameters[:format]
      parameter_format && parameter_format.to_sym
    end

    # Returns true if the request's "X-Requested-With" header contains
    # "XMLHttpRequest". (The Prototype Javascript library sends this header with
    # every Ajax request.)
    def xml_http_request?
      !(@env['HTTP_X_REQUESTED_WITH'] !~ /XMLHttpRequest/i)
    end
    alias xhr? :xml_http_request?

    # Which IP addresses are "trusted proxies" that can be stripped from
    # the right-hand-side of X-Forwarded-For
    TRUSTED_PROXIES = /^127\.0\.0\.1$|^(10|172\.(1[6-9]|2[0-9]|30|31)|192\.168)\./i

    # Determine originating IP address.  REMOTE_ADDR is the standard
    # but will fail if the user is behind a proxy.  HTTP_CLIENT_IP and/or
    # HTTP_X_FORWARDED_FOR are set by proxies so check for these if
    # REMOTE_ADDR is a proxy.  HTTP_X_FORWARDED_FOR may be a comma-
    # delimited list in the case of multiple chained proxies; the last
    # address which is not trusted is the originating IP.
    def remote_ip
      remote_addr_list = @env['REMOTE_ADDR'] && @env['REMOTE_ADDR'].split(',').collect(&:strip)

      unless remote_addr_list.blank?
        not_trusted_addrs = remote_addr_list.reject {|addr| addr =~ TRUSTED_PROXIES}
        return not_trusted_addrs.first unless not_trusted_addrs.empty?
      end
      remote_ips = @env['HTTP_X_FORWARDED_FOR'] && @env['HTTP_X_FORWARDED_FOR'].split(',')

      if @env.include? 'HTTP_CLIENT_IP'
        if remote_ips && !remote_ips.include?(@env['HTTP_CLIENT_IP'])
          # We don't know which came from the proxy, and which from the user
          raise ActionControllerError.new(<<EOM)
IP spoofing attack?!
HTTP_CLIENT_IP=#{@env['HTTP_CLIENT_IP'].inspect}
HTTP_X_FORWARDED_FOR=#{@env['HTTP_X_FORWARDED_FOR'].inspect}
EOM
        end

        return @env['HTTP_CLIENT_IP']
      end

      if remote_ips
        while remote_ips.size > 1 && TRUSTED_PROXIES =~ remote_ips.last.strip
          remote_ips.pop
        end

        return remote_ips.last.strip
      end

      @env['REMOTE_ADDR']
    end
    memoize :remote_ip

    # Returns the lowercase name of the HTTP server software.
    def server_software
      (@env['SERVER_SOFTWARE'] && /^([a-zA-Z]+)/ =~ @env['SERVER_SOFTWARE']) ? $1.downcase : nil
    end
    memoize :server_software


    # Returns the complete URL used for this request
    def url
      protocol + host_with_port + request_uri
    end
    memoize :url

    # Return 'https://' if this is an SSL request and 'http://' otherwise.
    def protocol
      ssl? ? 'https://' : 'http://'
    end
    memoize :protocol

    # Is this an SSL request?
    def ssl?
      @env['HTTPS'] == 'on' || @env['HTTP_X_FORWARDED_PROTO'] == 'https'
    end

    def raw_host_with_port
      if forwarded = env["HTTP_X_FORWARDED_HOST"]
        forwarded.split(/,\s?/).last
      else
        env['HTTP_HOST'] || env['SERVER_NAME'] || "#{env['SERVER_ADDR']}:#{env['SERVER_PORT']}"
      end
    end

    # Returns the host for this request, such as example.com.
    def host
      raw_host_with_port.sub(/:\d+$/, '')
    end
    memoize :host

    # Returns a host:port string for this request, such as example.com or
    # example.com:8080.
    def host_with_port
      "#{host}#{port_string}"
    end
    memoize :host_with_port

    # Returns the port number of this request as an integer.
    def port
      if raw_host_with_port =~ /:(\d+)$/
        $1.to_i
      else
        standard_port
      end
    end
    memoize :port

    # Returns the standard port number for this request's protocol
    def standard_port
      case protocol
        when 'https://' then 443
        else 80
      end
    end

    # Returns a port suffix like ":8080" if the port number of this request
    # is not the default HTTP port 80 or HTTPS port 443.
    def port_string
      port == standard_port ? '' : ":#{port}"
    end

    # Returns the domain part of a host, such as rubyonrails.org in "www.rubyonrails.org". You can specify
    # a different <tt>tld_length</tt>, such as 2 to catch rubyonrails.co.uk in "www.rubyonrails.co.uk".
    def domain(tld_length = 1)
      return nil unless named_host?(host)

      host.split('.').last(1 + tld_length).join('.')
    end

    # Returns all the subdomains as an array, so ["dev", "www"] would be returned for "dev.www.rubyonrails.org".
    # You can specify a different <tt>tld_length</tt>, such as 2 to catch ["www"] instead of ["www", "rubyonrails"]
    # in "www.rubyonrails.co.uk".
    def subdomains(tld_length = 1)
      return [] unless named_host?(host)
      parts = host.split('.')
      parts[0..-(tld_length+2)]
    end

    # Return the query string, accounting for server idiosyncrasies.
    def query_string
      if uri = @env['REQUEST_URI']
        uri.split('?', 2)[1] || ''
      else
        @env['QUERY_STRING'] || ''
      end
    end
    memoize :query_string

    # Return the request URI, accounting for server idiosyncrasies.
    # WEBrick includes the full URL. IIS leaves REQUEST_URI blank.
    def request_uri
      if uri = @env['REQUEST_URI']
        # Remove domain, which webrick puts into the request_uri.
        (%r{^\w+\://[^/]+(/.*|$)$} =~ uri) ? $1 : uri
      else
        # Construct IIS missing REQUEST_URI from SCRIPT_NAME and PATH_INFO.
        uri = @env['PATH_INFO'].to_s

        if script_filename = @env['SCRIPT_NAME'].to_s.match(%r{[^/]+$})
          uri = uri.sub(/#{script_filename}\//, '')
        end

        env_qs = @env['QUERY_STRING'].to_s
        uri += "?#{env_qs}" unless env_qs.empty?

        if uri.blank?
          @env.delete('REQUEST_URI')
        else
          @env['REQUEST_URI'] = uri
        end
      end
    end
    memoize :request_uri

    # Returns the interpreted path to requested resource after all the installation directory of this application was taken into account
    def path
      path = (uri = request_uri) ? uri.split('?').first.to_s : ''

      # Cut off the path to the installation directory if given
      path.sub!(%r/^#{ActionController::Base.relative_url_root}/, '')
      path || ''
    end
    memoize :path

    # Read the request body. This is useful for web services that need to
    # work with raw requests directly.
    def raw_post
      unless env.include? 'RAW_POST_DATA'
        env['RAW_POST_DATA'] = body.read(content_length)
        body.rewind if body.respond_to?(:rewind)
      end
      env['RAW_POST_DATA']
    end

    # Returns both GET and POST parameters in a single hash.
    def parameters
      @parameters ||= request_parameters.merge(query_parameters).update(path_parameters).with_indifferent_access
    end

    def path_parameters=(parameters) #:nodoc:
      @path_parameters = parameters
      @symbolized_path_parameters = @parameters = nil
    end

    # The same as <tt>path_parameters</tt> with explicitly symbolized keys
    def symbolized_path_parameters
      @symbolized_path_parameters ||= path_parameters.symbolize_keys
    end

    # Returns a hash with the parameters used to form the path of the request.
    # Returned hash keys are strings.  See <tt>symbolized_path_parameters</tt> for symbolized keys.
    #
    # Example:
    #
    #   {'action' => 'my_action', 'controller' => 'my_controller'}
    def path_parameters
      @path_parameters ||= {}
    end

    # The request body is an IO input stream. If the RAW_POST_DATA environment
    # variable is already set, wrap it in a StringIO.
    def body
      if raw_post = env['RAW_POST_DATA']
        raw_post.force_encoding(Encoding::BINARY) if raw_post.respond_to?(:force_encoding)
        StringIO.new(raw_post)
      else
        body_stream
      end
    end

    def remote_addr
      @env['REMOTE_ADDR']
    end

    def referrer
      @env['HTTP_REFERER']
    end
    alias referer referrer


    def query_parameters
      @query_parameters ||= self.class.parse_query_parameters(query_string)
    end

    def request_parameters
      @request_parameters ||= parse_formatted_request_parameters
    end


    #--
    # Must be implemented in the concrete request
    #++

    def body_stream #:nodoc:
    end

    def cookies #:nodoc:
    end

    def session #:nodoc:
    end

    def session=(session) #:nodoc:
      @session = session
    end

    def reset_session #:nodoc:
    end

    protected
      # The raw content type string. Use when you need parameters such as
      # charset or boundary which aren't included in the content_type MIME type.
      # Overridden by the X-POST_DATA_FORMAT header for backward compatibility.
      def content_type_with_parameters
        content_type_from_legacy_post_data_format_header ||
          env['CONTENT_TYPE'].to_s
      end

      # The raw content type string with its parameters stripped off.
      def content_type_without_parameters
        self.class.extract_content_type_without_parameters(content_type_with_parameters)
      end
      memoize :content_type_without_parameters

    private
      def content_type_from_legacy_post_data_format_header
        if x_post_format = @env['HTTP_X_POST_DATA_FORMAT']
          case x_post_format.to_s.downcase
            when 'yaml';  'application/x-yaml'
            when 'xml';   'application/xml'
          end
        end
      end

      def parse_formatted_request_parameters
        return {} if content_length.zero?

        content_type, boundary = self.class.extract_multipart_boundary(content_type_with_parameters)

        # Don't parse params for unknown requests.
        return {} if content_type.blank?

        mime_type = Mime::Type.lookup(content_type)
        strategy = ActionController::Base.param_parsers[mime_type]

        # Only multipart form parsing expects a stream.
        body = (strategy && strategy != :multipart_form) ? raw_post : self.body

        case strategy
          when Proc
            strategy.call(body)
          when :url_encoded_form
            self.class.clean_up_ajax_request_body! body
            self.class.parse_query_parameters(body)
          when :multipart_form
            self.class.parse_multipart_form_parameters(body, boundary, content_length, env)
          when :xml_simple, :xml_node
            body.blank? ? {} : Hash.from_xml(body).with_indifferent_access
          when :yaml
            YAML.load(body)
          when :json
            if body.blank?
              {}
            else
              data = ActiveSupport::JSON.decode(body)
              data = {:_json => data} unless data.is_a?(Hash)
              data.with_indifferent_access
            end
          else
            {}
        end
      rescue Exception => e # YAML, XML or Ruby code block errors
        raise
        { "body" => body,
          "content_type" => content_type_with_parameters,
          "content_length" => content_length,
          "exception" => "#{e.message} (#{e.class})",
          "backtrace" => e.backtrace }
      end

      def named_host?(host)
        !(host.nil? || /\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/.match(host))
      end

    class << self
      def parse_query_parameters(query_string)
        return {} if query_string.blank?

        pairs = query_string.split('&').collect do |chunk|
          next if chunk.empty?
          key, value = chunk.split('=', 2)
          next if key.empty?
          value = value.nil? ? nil : CGI.unescape(value)
          [ CGI.unescape(key), value ]
        end.compact

        UrlEncodedPairParser.new(pairs).result
      end

      def parse_request_parameters(params)
        parser = UrlEncodedPairParser.new

        params = params.dup
        until params.empty?
          for key, value in params
            if key.blank?
              params.delete key
            elsif !key.include?('[')
              # much faster to test for the most common case first (GET)
              # and avoid the call to build_deep_hash
              parser.result[key] = get_typed_value(value[0])
              params.delete key
            elsif value.is_a?(Array)
              parser.parse(key, get_typed_value(value.shift))
              params.delete key if value.empty?
            else
              raise TypeError, "Expected array, found #{value.inspect}"
            end
          end
        end

        parser.result
      end

      def parse_multipart_form_parameters(body, boundary, body_size, env)
        parse_request_parameters(read_multipart(body, boundary, body_size, env))
      end

      def extract_multipart_boundary(content_type_with_parameters)
        if content_type_with_parameters =~ MULTIPART_BOUNDARY
          ['multipart/form-data', $1.dup]
        else
          extract_content_type_without_parameters(content_type_with_parameters)
        end
      end

      def extract_content_type_without_parameters(content_type_with_parameters)
        $1.strip.downcase if content_type_with_parameters =~ /^([^,\;]*)/
      end

      def clean_up_ajax_request_body!(body)
        body.chop! if body[-1] == 0
        body.gsub!(/&_=$/, '')
      end


      private
        def get_typed_value(value)
          case value
            when String
              value
            when NilClass
              ''
            when Array
              value.map { |v| get_typed_value(v) }
            else
              if value.respond_to? :original_filename
                # Uploaded file
                if value.original_filename
                  value
                # Multipart param
                else
                  result = value.read
                  value.rewind
                  result
                end
              # Unknown value, neither string nor multipart.
              else
                raise "Unknown form value: #{value.inspect}"
              end
          end
        end

        MULTIPART_BOUNDARY = %r|\Amultipart/form-data.*boundary=\"?([^\";,]+)\"?|n

        EOL = "\015\012"

        def read_multipart(body, boundary, body_size, env)
          params = Hash.new([])
          boundary = "--" + boundary
          quoted_boundary = Regexp.quote(boundary)
          buf = ""
          bufsize = 10 * 1024
          boundary_end=""

          # start multipart/form-data
          body.binmode if defined? body.binmode
          case body
          when File
            body.set_encoding(Encoding::BINARY) if body.respond_to?(:set_encoding)
          when StringIO
            body.string.force_encoding(Encoding::BINARY) if body.string.respond_to?(:force_encoding)
          end
          boundary_size = boundary.size + EOL.size
          body_size -= boundary_size
          status = body.read(boundary_size)
          if nil == status
            raise EOFError, "no content body"
          elsif boundary + EOL != status
            raise EOFError, "bad content body"
          end

          loop do
            head = nil
            content =
              if 10240 < body_size
                UploadedTempfile.new("CGI")
              else
                UploadedStringIO.new
              end
            content.binmode if defined? content.binmode

            until head and /#{quoted_boundary}(?:#{EOL}|--)/n.match(buf)

              if (not head) and /#{EOL}#{EOL}/n.match(buf)
                buf = buf.sub(/\A((?:.|\n)*?#{EOL})#{EOL}/n) do
                  head = $1.dup
                  ""
                end
                next
              end

              if head and ( (EOL + boundary + EOL).size < buf.size )
                content.print buf[0 ... (buf.size - (EOL + boundary + EOL).size)]
                buf[0 ... (buf.size - (EOL + boundary + EOL).size)] = ""
              end

              c = if bufsize < body_size
                    body.read(bufsize)
                  else
                    body.read(body_size)
                  end
              if c.nil? || c.empty?
                raise EOFError, "bad content body"
              end
              buf.concat(c)
              body_size -= c.size
            end

            buf = buf.sub(/\A((?:.|\n)*?)(?:[\r\n]{1,2})?#{quoted_boundary}([\r\n]{1,2}|--)/n) do
              content.print $1
              if "--" == $2
                body_size = -1
              end
              boundary_end = $2.dup
              ""
            end

            content.rewind

            head =~ /Content-Disposition:.* filename=(?:"((?:\\.|[^\"])*)"|([^;]*))/ni
            if filename = $1 || $2
              if /Mac/ni.match(env['HTTP_USER_AGENT']) and
                  /Mozilla/ni.match(env['HTTP_USER_AGENT']) and
                  (not /MSIE/ni.match(env['HTTP_USER_AGENT']))
                filename = CGI.unescape(filename)
              end
              content.original_path = filename.dup
            end

            head =~ /Content-Type: ([^\r]*)/ni
            content.content_type = $1.dup if $1

            head =~ /Content-Disposition:.* name="?([^\";]*)"?/ni
            name = $1.dup if $1

            if params.has_key?(name)
              params[name].push(content)
            else
              params[name] = [content]
            end
            break if body_size == -1
          end
          raise EOFError, "bad boundary end of body part" unless boundary_end=~/--/

          begin
            body.rewind if body.respond_to?(:rewind)
          rescue Errno::ESPIPE
            # Handles exceptions raised by input streams that cannot be rewound
            # such as when using plain CGI under Apache
          end

          params
        end
    end
  end

  class UrlEncodedPairParser < StringScanner #:nodoc:
    attr_reader :top, :parent, :result

    def initialize(pairs = [])
      super('')
      @result = {}
      pairs.each { |key, value| parse(key, value) }
    end

    KEY_REGEXP = %r{([^\[\]=&]+)}
    BRACKETED_KEY_REGEXP = %r{\[([^\[\]=&]+)\]}

    # Parse the query string
    def parse(key, value)
      self.string = key
      @top, @parent = result, nil

      # First scan the bare key
      key = scan(KEY_REGEXP) or return
      key = post_key_check(key)

      # Then scan as many nestings as present
      until eos?
        r = scan(BRACKETED_KEY_REGEXP) or return
        key = self[1]
        key = post_key_check(key)
      end

      bind(key, value)
    end

    private
      # After we see a key, we must look ahead to determine our next action. Cases:
      #
      #   [] follows the key. Then the value must be an array.
      #   = follows the key. (A value comes next)
      #   & or the end of string follows the key. Then the key is a flag.
      #   otherwise, a hash follows the key.
      def post_key_check(key)
        if scan(/\[\]/) # a[b][] indicates that b is an array
          container(key, Array)
          nil
        elsif check(/\[[^\]]/) # a[b] indicates that a is a hash
          container(key, Hash)
          nil
        else # End of key? We do nothing.
          key
        end
      end

      # Add a container to the stack.
      def container(key, klass)
        type_conflict! klass, top[key] if top.is_a?(Hash) && top.key?(key) && ! top[key].is_a?(klass)
        value = bind(key, klass.new)
        type_conflict! klass, value unless value.is_a?(klass)
        push(value)
      end

      # Push a value onto the 'stack', which is actually only the top 2 items.
      def push(value)
        @parent, @top = @top, value
      end

      # Bind a key (which may be nil for items in an array) to the provided value.
      def bind(key, value)
        if top.is_a? Array
          if key
            if top[-1].is_a?(Hash) && ! top[-1].key?(key)
              top[-1][key] = value
            else
              top << {key => value}.with_indifferent_access
              push top.last
              value = top[key]
            end
          else
            top << value
          end
        elsif top.is_a? Hash
          key = CGI.unescape(key)
          parent << (@top = {}) if top.key?(key) && parent.is_a?(Array)
          top[key] ||= value
          return top[key]
        else
          raise ArgumentError, "Don't know what to do: top is #{top.inspect}"
        end

        return value
      end

      def type_conflict!(klass, value)
        raise TypeError, "Conflicting types for parameter containers. Expected an instance of #{klass} but found an instance of #{value.class}. This can be caused by colliding Array and Hash parameters like qs[]=value&qs[key]=value. (The parameters received were #{value.inspect}.)"
      end
  end

  module UploadedFile
    def self.included(base)
      base.class_eval do
        attr_accessor :original_path, :content_type
        alias_method :local_path, :path
      end
    end

    # Take the basename of the upload's original filename.
    # This handles the full Windows paths given by Internet Explorer
    # (and perhaps other broken user agents) without affecting
    # those which give the lone filename.
    # The Windows regexp is adapted from Perl's File::Basename.
    def original_filename
      unless defined? @original_filename
        @original_filename =
          unless original_path.blank?
            if original_path =~ /^(?:.*[:\\\/])?(.*)/m
              $1
            else
              File.basename original_path
            end
          end
      end
      @original_filename
    end
  end

  class UploadedStringIO < StringIO
    include UploadedFile
  end

  class UploadedTempfile < Tempfile
    include UploadedFile
  end
end