| Current File : //opt/alt/ruby24/lib64/ruby/gems/2.4.0/gems/rack-1.6.4/lib/rack/multipart/parser.rb |
require 'rack/utils'
module Rack
module Multipart
class MultipartPartLimitError < Errno::EMFILE; end
class Parser
BUFSIZE = 16384
DUMMY = Struct.new(:parse).new
def self.create(env)
return DUMMY unless env['CONTENT_TYPE'] =~ MULTIPART
io = env['rack.input']
io.rewind
content_length = env['CONTENT_LENGTH']
content_length = content_length.to_i if content_length
tempfile = env['rack.multipart.tempfile_factory'] ||
lambda { |filename, content_type| Tempfile.new(["RackMultipart", ::File.extname(filename)]) }
bufsize = env['rack.multipart.buffer_size'] || BUFSIZE
new($1, io, content_length, env, tempfile, bufsize)
end
def initialize(boundary, io, content_length, env, tempfile, bufsize)
@buf = ""
if @buf.respond_to? :force_encoding
@buf.force_encoding Encoding::ASCII_8BIT
end
@params = Utils::KeySpaceConstrainedParams.new
@boundary = "--#{boundary}"
@io = io
@content_length = content_length
@boundary_size = Utils.bytesize(@boundary) + EOL.size
@env = env
@tempfile = tempfile
@bufsize = bufsize
if @content_length
@content_length -= @boundary_size
end
@rx = /(?:#{EOL})?#{Regexp.quote(@boundary)}(#{EOL}|--)/n
@full_boundary = @boundary + EOL
end
def 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 MultipartPartLimitError, '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
get_data(filename, body, content_type, name, head) do |data|
tag_multipart_encoding(filename, content_type, name, data)
Utils.normalize_params(@params, name, data)
end
# 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 full_boundary; @full_boundary; end
def rx; @rx; 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 = ''
if body.respond_to? :force_encoding
body.force_encoding Encoding::ASCII_8BIT
end
filename = content_type = name = 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 name.nil? || name.empty? && filename
name = filename
end
if filename
(@env['rack.tempfiles'] ||= []) << body = @tempfile.call(filename, content_type)
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
case head
when RFC2183
filename = Hash[head.scan(DISPPARM)]['filename']
filename = $1 if filename and filename =~ /^"(.*)"$/
when BROKEN_QUOTED, BROKEN_UNQUOTED
filename = $1
end
return unless filename
if filename.scan(/%.?.?/).all? { |s| s =~ /%[0-9a-fA-F]{2}/ }
filename = Utils.unescape(filename)
end
scrub_filename filename
if filename !~ /\\[^\\"]/
filename = filename.gsub(/\\(.)/, '\1')
end
filename
end
if "<3".respond_to? :valid_encoding?
def scrub_filename(filename)
unless filename.valid_encoding?
# FIXME: this force_encoding is for Ruby 2.0 and 1.9 support.
# We can remove it after they are dropped
filename.force_encoding(Encoding::ASCII_8BIT)
filename.encode!(:invalid => :replace, :undef => :replace)
end
end
CHARSET = "charset"
TEXT_PLAIN = "text/plain"
def tag_multipart_encoding(filename, content_type, name, body)
name.force_encoding Encoding::UTF_8
return if filename
encoding = Encoding::UTF_8
if content_type
list = content_type.split(';')
type_subtype = list.first
type_subtype.strip!
if TEXT_PLAIN == type_subtype
rest = list.drop 1
rest.each do |param|
k,v = param.split('=', 2)
k.strip!
v.strip!
encoding = Encoding.find v if k == CHARSET
end
end
end
name.force_encoding encoding
body.force_encoding encoding
end
else
def scrub_filename(filename)
end
def tag_multipart_encoding(filename, content_type, name, body)
end
end
def get_data(filename, body, content_type, name, head)
data = body
if filename == ""
# filename is blank which means no file has been selected
return
elsif filename
body.rewind if body.respond_to?(: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}
end
yield data
end
end
end
end