Class: Praxis::MultipartParser

Inherits:
Object
  • Object
show all
Defined in:
lib/praxis/multipart/parser.rb

Constant Summary collapse

EOL = 
"\r\n"
MULTIPART_BOUNDARY = 
'AaB03x'
MULTIPART = 
%r{\Amultipart/.*boundary="?([^";,]+)"?}n.freeze
TOKEN = 
%r{[^\s()<>,;:\\"/\[\]?=]+}.freeze
CONDISP = 
/Content-Disposition:\s*#{TOKEN}\s*/i.freeze
DISPPARM = 
/;\s*(#{TOKEN})=("(?:\\"|[^"])*"|#{TOKEN})/.freeze
RFC2183 = 
/^#{CONDISP}(#{DISPPARM})+$/i.freeze
BROKEN_QUOTED = 
/^#{CONDISP}.*;\sfilename="(.*?)"(?:\s*$|\s*;\s*#{TOKEN}=)/i.freeze
BROKEN_UNQUOTED = 
/^#{CONDISP}.*;\sfilename=(#{TOKEN})/i.freeze
MULTIPART_CONTENT_TYPE = 
/Content-Type: (.*)#{EOL}/ni.freeze
MULTIPART_CONTENT_DISPOSITION = 
/Content-Disposition:.*\s+name="?([^";]*)"?/ni.freeze
MULTIPART_CONTENT_ID = 
/Content-ID:\s*([^#{EOL}]*)/ni.freeze
HEADER_KV = 
/(?<k>[^:]+): (?<v>.*)/.freeze
UNTIL_NEWLINE = 
/\A([^\n]*\n)/.freeze
TERMINAL_CRLF = 
/\r\n$/.freeze
PARAMS_BUF_SIZE =

Same as implicitly in rack 1.x

65_536
BUFSIZE = 
16_384

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(headers, body) ⇒ MultipartParser

Returns a new instance of MultipartParser.



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# File 'lib/praxis/multipart/parser.rb', line 33

def initialize(headers, body)
  @headers = headers
  @io = StringIO.new
  Array(body).each do |chunk|
    @io << chunk
  end
  @io.rewind
  @parts = []
end

Class Method Details

.parse(headers, body) ⇒ Object 



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# File 'lib/praxis/multipart/parser.rb', line 29

def self.parse(headers, body)
  new(headers, body).parse
end

Instance Method Details

#parse ⇒ Object 



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# File 'lib/praxis/multipart/parser.rb', line 43

def parse
  return nil unless setup_parse

  @preamble = fast_forward_to_first_boundary

  loop do
    head, filename, content_type, name, body =
      current_head_and_filename_and_content_type_and_name_and_body

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

      @content_length = -1 if Regexp.last_match(1) == '--'
    end

    filename, data = get_data(filename, body, content_type, name, head)

    parsed_headers = head.split(EOL).each_with_object({}) do |line, hash|
      match = HEADER_KV.match(line)
      k = match[:k]
      v = match[:v]
      hash[k] = v
    end

    part = MultipartPart.new(data, parsed_headers, name: name, filename: filename)

    @parts << part

    # break if we're at the end of a buffer, but not if it is the end of a field
    break if (@buf.empty? && Regexp.last_match(1) != EOL) || @content_length == -1
  end

  @io.rewind

  [@preamble, @parts]
end