Module: Rack::Utils::Multipart

Defined in:
lib/rack/utils.rb

Overview

A multipart form data parser, adapted from IOWA.

Usually, Rack::Request#POST takes care of calling this.

Constant Summary collapse

EOL = 
"\r\n"

Class Method Summary collapse

Class Method Details

.parse_multipart(env) ⇒ Object 



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# File 'lib/rack/utils.rb', line 168

def self.parse_multipart(env)
  unless env['CONTENT_TYPE'] =~
      %r|\Amultipart/form-data.*boundary=\"?([^\";,]+)\"?|n
    nil
  else
    boundary = "--#{$1}"

    params = {}
    buf = ""
    content_length = env['CONTENT_LENGTH'].to_i
    input = env['rack.input']

    boundary_size = boundary.size + EOL.size
    bufsize = 16384

    content_length -= boundary_size

    status = input.read(boundary_size)
    raise EOFError, "bad content body"  unless status == boundary + EOL

    rx = /(?:#{EOL})?#{Regexp.quote boundary}(#{EOL}|--)/

    loop {
      head = nil
      body = ''
      filename = content_type = name = nil

      until head && buf =~ rx
        if !head && i = buf.index("\r\n\r\n")
          head = buf.slice!(0, i+2) # First \r\n
          buf.slice!(0, 2)          # Second \r\n

          filename = head[/Content-Disposition:.* filename="?([^\";]*)"?/ni, 1]
          content_type = head[/Content-Type: (.*)\r\n/ni, 1]
          name = head[/Content-Disposition:.* name="?([^\";]*)"?/ni, 1]

          if filename
            body = Tempfile.new("RackMultipart")
            body.binmode
          end

          next
        end

        # Save the read body part.
        if head && (boundary_size+4 < buf.size)
          body << buf.slice!(0, buf.size - (boundary_size+4))
        end

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

      # Save the rest.
      if i = buf.index(rx)
        body << buf.slice!(0, i)
        buf.slice!(0, boundary_size+2)

        content_length = -1  if $1 == "--"
      end

      if filename
        body.rewind
        data = {:filename => filename, :type => content_type,
                :name => name, :tempfile => body, :head => head}
      else
        data = body
      end

      if name
        if name =~ /\[\]\z/
          params[name] ||= []
          params[name] << data
        else
          params[name] = data
        end
      end

      break  if buf.empty? || content_length == -1
    }

    params
  end
end