/
parser.rb
185 lines (141 loc) · 5.15 KB
/
parser.rb
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require 'rack/utils'
module Rack
module Multipart
class MultipartLimitError < Errno::EMFILE; end
class Parser
BUFSIZE = 16384
def initialize(env)
@env = env
end
def parse
return nil unless setup_parse
fast_forward_to_first_boundary
opened_files = 0
loop do
head, filename, content_type, name, body =
get_current_head_and_filename_and_content_type_and_name_and_body
if Utils.multipart_part_limit > 0
opened_files += 1 if filename
raise MultipartLimitError, 'Maximum file multiparts in content reached' if opened_files >= Utils.multipart_part_limit
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
filename, data = get_data(filename, body, content_type, name, head)
Utils.normalize_params(@params, name, data) unless data.nil?
# break if we're at the end of a buffer, but not if it is the end of a field
break if (@buf.empty? && $1 != EOL) || @content_length == -1
end
@io.rewind
@params.to_params_hash
end
private
def setup_parse
return false unless @env['CONTENT_TYPE'] =~ MULTIPART
@boundary = "--#{$1}"
@buf = ""
@params = Utils::KeySpaceConstrainedParams.new
@io = @env['rack.input']
@io.rewind
@boundary_size = Utils.bytesize(@boundary) + EOL.size
if @content_length = @env['CONTENT_LENGTH']
@content_length = @content_length.to_i
@content_length -= @boundary_size
end
true
end
def full_boundary
@boundary + EOL
end
def rx
@rx ||= /(?:#{EOL})?#{Regexp.quote(@boundary)}(#{EOL}|--)/n
end
def fast_forward_to_first_boundary
loop do
content = @io.read(BUFSIZE)
raise EOFError, "bad content body" unless content
@buf << content
while @buf.gsub!(/\A([^\n]*\n)/, '')
read_buffer = $1
return if read_buffer == full_boundary
end
raise EOFError, "bad content body" if Utils.bytesize(@buf) >= BUFSIZE
end
end
def get_current_head_and_filename_and_content_type_and_name_and_body
head = nil
body = ''
filename = content_type = name = nil
content = nil
until head && @buf =~ rx
if !head && i = @buf.index(EOL+EOL)
head = @buf.slice!(0, i+2) # First \r\n
@buf.slice!(0, 2) # Second \r\n
content_type = head[MULTIPART_CONTENT_TYPE, 1]
name = head[MULTIPART_CONTENT_DISPOSITION, 1] || head[MULTIPART_CONTENT_ID, 1]
filename = get_filename(head)
if filename
body = Tempfile.new("RackMultipart")
body.binmode if body.respond_to?(: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
content = @io.read(@content_length && BUFSIZE >= @content_length ? @content_length : BUFSIZE)
raise EOFError, "bad content body" if content.nil? || content.empty?
@buf << content
@content_length -= content.size if @content_length
end
[head, filename, content_type, name, body]
end
def get_filename(head)
filename = nil
if head =~ RFC2183
filename = Hash[head.scan(DISPPARM)]['filename']
filename = $1 if filename and filename =~ /^"(.*)"$/
elsif head =~ BROKEN_QUOTED
filename = $1
elsif head =~ BROKEN_UNQUOTED
filename = $1
end
if filename && filename.scan(/%.?.?/).all? { |s| s =~ /%[0-9a-fA-F]{2}/ }
filename = Utils.unescape(filename)
end
if filename && filename !~ /\\[^\\"]/
filename = filename.gsub(/\\(.)/, '\1')
end
filename
end
def get_data(filename, body, content_type, name, head)
data = nil
if filename == ""
# filename is blank which means no file has been selected
return data
elsif filename
body.rewind
# 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.
filename = filename.split(/[\/\\]/).last
data = {:filename => filename, :type => content_type,
:name => name, :tempfile => body, :head => head}
elsif !filename && content_type && body.is_a?(IO)
body.rewind
# Generic multipart cases, not coming from a form
data = {:type => content_type,
:name => name, :tempfile => body, :head => head}
else
data = body
end
[filename, data]
end
end
end
end