FM / ruby-2.7.8

/opt/cpanel/ea-ruby27/root/usr/share/ruby/ruby-2.7.8/

/opt/cpanel/ea-ruby27/root/usr/share/ruby/ruby-2.7.8

Name	Size	Mode	Actions
benchmark/	-	0755	rm
bigdecimal/	-	0755	rm
bundler/	-	0755	rm
cgi/	-	0755	rm
csv/	-	0755	rm
delegate/	-	0755	rm
did_you_mean/	-	0755	rm
digest/	-	0755	rm
drb/	-	0755	rm
fiddle/	-	0755	rm
forwardable/	-	0755	rm
getoptlong/	-	0755	rm
io/	-	0755	rm
irb/	-	0755	rm
json/	-	0755	rm
logger/	-	0755	rm
matrix/	-	0755	rm
net/	-	0755	rm
observer/	-	0755	rm
open3/	-	0755	rm
openssl/	-	0755	rm
optparse/	-	0755	rm
ostruct/	-	0755	rm
pstore/	-	0755	rm
psych/	-	0755	rm
racc/	-	0755	rm
rdoc/	-	0755	rm
reline/	-	0755	rm
rexml/	-	0755	rm
rinda/	-	0755	rm
ripper/	-	0755	rm
rss/	-	0755	rm
rubygems/	-	0755	rm
singleton/	-	0755	rm
syslog/	-	0755	rm
timeout/	-	0755	rm
tracer/	-	0755	rm
unicode_normalize/	-	0755	rm
uri/	-	0755	rm
webrick/	-	0755	rm
yaml/	-	0755	rm
abbrev.rb	3529	0644	edit dl rm
base64.rb	3379	0644	edit dl rm
benchmark.rb	18453	0644	edit dl rm
bigdecimal.rb	24	0644	edit dl rm
bundler.rb	23718	0644	edit dl rm
cgi.rb	10037	0644	edit dl rm
coverage.rb	368	0644	edit dl rm
csv.rb	55643	0644	edit dl rm
date.rb	1066	0644	edit dl rm
debug.rb	30624	0644	edit dl rm
delegate.rb	11343	0644	edit dl rm
did_you_mean.rb	3806	0644	edit dl rm
digest.rb	2894	0644	edit dl rm
drb.rb	50	0644	edit dl rm
English.rb	6258	0644	edit dl rm
erb.rb	29504	0644	edit dl rm
expect.rb	2217	0644	edit dl rm
fiddle.rb	1722	0644	edit dl rm
fileutils.rb	49271	0644	edit dl rm
find.rb	2526	0644	edit dl rm
forwardable.rb	9130	0644	edit dl rm
getoptlong.rb	15787	0644	edit dl rm
ipaddr.rb	19989	0644	edit dl rm
irb.rb	27603	0644	edit dl rm
json.rb	1809	0644	edit dl rm
kconv.rb	5861	0644	edit dl rm
logger.rb	16792	0644	edit dl rm
matrix.rb	61703	0644	edit dl rm
mkmf.rb	88539	0644	edit dl rm
monitor.rb	6920	0644	edit dl rm
mutex_m.rb	2214	0644	edit dl rm
observer.rb	5971	0644	edit dl rm
open-uri.rb	26088	0644	edit dl rm
open3.rb	22336	0644	edit dl rm
openssl.rb	469	0644	edit dl rm
optionparser.rb	59	0644	edit dl rm
optparse.rb	60919	0644	edit dl rm
ostruct.rb	10785	0644	edit dl rm
pathname.rb	16558	0644	edit dl rm
pp.rb	15978	0644	edit dl rm
prettyprint.rb	16276	0644	edit dl rm
prime.rb	12670	0644	edit dl rm
pstore.rb	15063	0644	edit dl rm
psych.rb	21718	0644	edit dl rm
racc.rb	137	0644	edit dl rm
rdoc.rb	5000	0644	edit dl rm
readline.rb	113	0644	edit dl rm
reline.rb	13253	0644	edit dl rm
resolv-replace.rb	1805	0644	edit dl rm
resolv.rb	79564	0644	edit dl rm
ripper.rb	2494	0644	edit dl rm
rss.rb	2963	0644	edit dl rm
rubygems.rb	39108	0644	edit dl rm
securerandom.rb	9528	0644	edit dl rm
set.rb	24622	0644	edit dl rm
shellwords.rb	6816	0644	edit dl rm
singleton.rb	4158	0644	edit dl rm
socket.rb	44702	0644	edit dl rm
tempfile.rb	11213	0644	edit dl rm
time.rb	24590	0644	edit dl rm
timeout.rb	4075	0644	edit dl rm
tmpdir.rb	4142	0644	edit dl rm
tracer.rb	6640	0644	edit dl rm
tsort.rb	14642	0644	edit dl rm
un.rb	10202	0644	edit dl rm
uri.rb	3039	0644	edit dl rm
weakref.rb	1473	0644	edit dl rm
webrick.rb	6890	0644	edit dl rm
yaml.rb	1845	0644	edit dl rm

Edit: /opt/cpanel/ea-ruby27/root/usr/share/ruby/ruby-2.7.8/open-uri.rb (26088B)

# frozen_string_literal: true
require 'uri'
require 'stringio'
require 'time'

module Kernel
  private
  alias open_uri_original_open open # :nodoc:
  class << self
    alias open_uri_original_open open # :nodoc:
  end

def open(name, *rest, **kw, &block) # :nodoc:
    if (name.respond_to?(:open) && !name.respond_to?(:to_path)) ||
       (name.respond_to?(:to_str) &&
        %r{\A[A-Za-z][A-Za-z0-9+\-\.]*://} =~ name &&
        (uri = URI.parse(name)).respond_to?(:open))
      warn('calling URI.open via Kernel#open is deprecated, call URI.open directly or use URI#open', uplevel: 1)
      URI.open(name, *rest, **kw, &block)
    else
      open_uri_original_open(name, *rest, **kw, &block)
    end
  end
  module_function :open
end

module URI
  # Allows the opening of various resources including URIs.
  #
  # If the first argument responds to the 'open' method, 'open' is called on
  # it with the rest of the arguments.
  #
  # If the first argument is a string that begins with <code>(protocol)://<code>, it is parsed by
  # URI.parse.  If the parsed object responds to the 'open' method,
  # 'open' is called on it with the rest of the arguments.
  #
  # Otherwise, Kernel#open is called.
  #
  # OpenURI::OpenRead#open provides URI::HTTP#open, URI::HTTPS#open and
  # URI::FTP#open, Kernel#open.
  #
  # We can accept URIs and strings that begin with http://, https:// and
  # ftp://. In these cases, the opened file object is extended by OpenURI::Meta.
  def self.open(name, *rest, &block)
    if name.respond_to?(:open)
      name.open(*rest, &block)
    elsif name.respond_to?(:to_str) &&
          %r{\A[A-Za-z][A-Za-z0-9+\-\.]*://} =~ name &&
          (uri = URI.parse(name)).respond_to?(:open)
      uri.open(*rest, &block)
    else
      open_uri_original_open(name, *rest, &block)
      # After Kernel#open override is removed:
      #super
    end
  end
end

# OpenURI is an easy-to-use wrapper for Net::HTTP, Net::HTTPS and Net::FTP.
#
# == Example
#
# It is possible to open an http, https or ftp URL as though it were a file:
#
#   URI.open("http://www.ruby-lang.org/") {|f|
#     f.each_line {|line| p line}
#   }
#
# The opened file has several getter methods for its meta-information, as
# follows, since it is extended by OpenURI::Meta.
#
#   URI.open("http://www.ruby-lang.org/en") {|f|
#     f.each_line {|line| p line}
#     p f.base_uri         # <URI::HTTP:0x40e6ef2 URL:http://www.ruby-lang.org/en/>
#     p f.content_type     # "text/html"
#     p f.charset          # "iso-8859-1"
#     p f.content_encoding # []
#     p f.last_modified    # Thu Dec 05 02:45:02 UTC 2002
#   }
#
# Additional header fields can be specified by an optional hash argument.
#
#   URI.open("http://www.ruby-lang.org/en/",
#     "User-Agent" => "Ruby/#{RUBY_VERSION}",
#     "From" => "foo@bar.invalid",
#     "Referer" => "http://www.ruby-lang.org/") {|f|
#     # ...
#   }
#
# The environment variables such as http_proxy, https_proxy and ftp_proxy
# are in effect by default. Here we disable proxy:
#
#   URI.open("http://www.ruby-lang.org/en/", :proxy => nil) {|f|
#     # ...
#   }
#
# See OpenURI::OpenRead.open and URI.open for more on available options.
#
# URI objects can be opened in a similar way.
#
#   uri = URI.parse("http://www.ruby-lang.org/en/")
#   uri.open {|f|
#     # ...
#   }
#
# URI objects can be read directly. The returned string is also extended by
# OpenURI::Meta.
#
#   str = uri.read
#   p str.base_uri
#
# Author:: Tanaka Akira <akr@m17n.org>

module OpenURI
  Options = {
    :proxy => true,
    :proxy_http_basic_authentication => true,
    :progress_proc => true,
    :content_length_proc => true,
    :http_basic_authentication => true,
    :read_timeout => true,
    :open_timeout => true,
    :ssl_ca_cert => nil,
    :ssl_verify_mode => nil,
    :ftp_active_mode => false,
    :redirect => true,
    :encoding => nil,
  }

def OpenURI.check_options(options) # :nodoc:
    options.each {|k, v|
      next unless Symbol === k
      unless Options.include? k
        raise ArgumentError, "unrecognized option: #{k}"
      end
    }
  end

def OpenURI.scan_open_optional_arguments(*rest) # :nodoc:
    if !rest.empty? && (String === rest.first || Integer === rest.first)
      mode = rest.shift
      if !rest.empty? && Integer === rest.first
        perm = rest.shift
      end
    end
    return mode, perm, rest
  end

def OpenURI.open_uri(name, *rest) # :nodoc:
    uri = URI::Generic === name ? name : URI.parse(name)
    mode, _, rest = OpenURI.scan_open_optional_arguments(*rest)
    options = rest.shift if !rest.empty? && Hash === rest.first
    raise ArgumentError.new("extra arguments") if !rest.empty?
    options ||= {}
    OpenURI.check_options(options)

if /\Arb?(?:\Z|:([^:]+))/ =~ mode
      encoding, = $1,Encoding.find($1) if $1
      mode = nil
    end
    if options.has_key? :encoding
      if !encoding.nil?
        raise ArgumentError, "encoding specified twice"
      end
      encoding = Encoding.find(options[:encoding])
    end

unless mode == nil ||
           mode == 'r' || mode == 'rb' ||
           mode == File::RDONLY
      raise ArgumentError.new("invalid access mode #{mode} (#{uri.class} resource is read only.)")
    end

io = open_loop(uri, options)
    io.set_encoding(encoding) if encoding
    if block_given?
      begin
        yield io
      ensure
        if io.respond_to? :close!
          io.close! # Tempfile
        else
          io.close if !io.closed?
        end
      end
    else
      io
    end
  end

def OpenURI.open_loop(uri, options) # :nodoc:
    proxy_opts = []
    proxy_opts << :proxy_http_basic_authentication if options.include? :proxy_http_basic_authentication
    proxy_opts << :proxy if options.include? :proxy
    proxy_opts.compact!
    if 1 < proxy_opts.length
      raise ArgumentError, "multiple proxy options specified"
    end
    case proxy_opts.first
    when :proxy_http_basic_authentication
      opt_proxy, proxy_user, proxy_pass = options.fetch(:proxy_http_basic_authentication)
      proxy_user = proxy_user.to_str
      proxy_pass = proxy_pass.to_str
      if opt_proxy == true
        raise ArgumentError.new("Invalid authenticated proxy option: #{options[:proxy_http_basic_authentication].inspect}")
      end
    when :proxy
      opt_proxy = options.fetch(:proxy)
      proxy_user = nil
      proxy_pass = nil
    when nil
      opt_proxy = true
      proxy_user = nil
      proxy_pass = nil
    end
    case opt_proxy
    when true
      find_proxy = lambda {|u| pxy = u.find_proxy; pxy ? [pxy, nil, nil] : nil}
    when nil, false
      find_proxy = lambda {|u| nil}
    when String
      opt_proxy = URI.parse(opt_proxy)
      find_proxy = lambda {|u| [opt_proxy, proxy_user, proxy_pass]}
    when URI::Generic
      find_proxy = lambda {|u| [opt_proxy, proxy_user, proxy_pass]}
    else
      raise ArgumentError.new("Invalid proxy option: #{opt_proxy}")
    end

uri_set = {}
    buf = nil
    while true
      redirect = catch(:open_uri_redirect) {
        buf = Buffer.new
        uri.buffer_open(buf, find_proxy.call(uri), options)
        nil
      }
      if redirect
        if redirect.relative?
          # Although it violates RFC2616, Location: field may have relative
          # URI.  It is converted to absolute URI using uri as a base URI.
          redirect = uri + redirect
        end
        if !options.fetch(:redirect, true)
          raise HTTPRedirect.new(buf.io.status.join(' '), buf.io, redirect)
        end
        unless OpenURI.redirectable?(uri, redirect)
          raise "redirection forbidden: #{uri} -> #{redirect}"
        end
        if options.include? :http_basic_authentication
          # send authentication only for the URI directly specified.
          options = options.dup
          options.delete :http_basic_authentication
        end
        uri = redirect
        raise "HTTP redirection loop: #{uri}" if uri_set.include? uri.to_s
        uri_set[uri.to_s] = true
      else
        break
      end
    end
    io = buf.io
    io.base_uri = uri
    io
  end

def OpenURI.redirectable?(uri1, uri2) # :nodoc:
    # This test is intended to forbid a redirection from http://... to
    # file:///etc/passwd, file:///dev/zero, etc.  CVE-2011-1521
    # https to http redirect is also forbidden intentionally.
    # It avoids sending secure cookie or referer by non-secure HTTP protocol.
    # (RFC 2109 4.3.1, RFC 2965 3.3, RFC 2616 15.1.3)
    # However this is ad hoc.  It should be extensible/configurable.
    uri1.scheme.downcase == uri2.scheme.downcase ||
    (/\A(?:http|ftp)\z/i =~ uri1.scheme && /\A(?:https?|ftp)\z/i =~ uri2.scheme)
  end

def OpenURI.open_http(buf, target, proxy, options) # :nodoc:
    if proxy
      proxy_uri, proxy_user, proxy_pass = proxy
      raise "Non-HTTP proxy URI: #{proxy_uri}" if proxy_uri.class != URI::HTTP
    end

if target.userinfo
      raise ArgumentError, "userinfo not supported.  [RFC3986]"
    end

header = {}
    options.each {|k, v| header[k] = v if String === k }

require 'net/http'
    klass = Net::HTTP
    if URI::HTTP === target
      # HTTP or HTTPS
      if proxy
        unless proxy_user && proxy_pass
          proxy_user, proxy_pass = proxy_uri.userinfo.split(':') if proxy_uri.userinfo
        end
        if proxy_user && proxy_pass
          klass = Net::HTTP::Proxy(proxy_uri.hostname, proxy_uri.port, proxy_user, proxy_pass)
        else
          klass = Net::HTTP::Proxy(proxy_uri.hostname, proxy_uri.port)
        end
      end
      target_host = target.hostname
      target_port = target.port
      request_uri = target.request_uri
    else
      # FTP over HTTP proxy
      target_host = proxy_uri.hostname
      target_port = proxy_uri.port
      request_uri = target.to_s
      if proxy_user && proxy_pass
        header["Proxy-Authorization"] =
                        'Basic ' + ["#{proxy_user}:#{proxy_pass}"].pack('m0')
      end
    end

http = proxy ? klass.new(target_host, target_port) : klass.new(target_host, target_port, nil)
    if target.class == URI::HTTPS
      require 'net/https'
      http.use_ssl = true
      http.verify_mode = options[:ssl_verify_mode] || OpenSSL::SSL::VERIFY_PEER
      store = OpenSSL::X509::Store.new
      if options[:ssl_ca_cert]
        Array(options[:ssl_ca_cert]).each do |cert|
          if File.directory? cert
            store.add_path cert
          else
            store.add_file cert
          end
        end
      else
        store.set_default_paths
      end
      http.cert_store = store
    end
    if options.include? :read_timeout
      http.read_timeout = options[:read_timeout]
    end
    if options.include? :open_timeout
      http.open_timeout = options[:open_timeout]
    end

resp = nil
    http.start {
      req = Net::HTTP::Get.new(request_uri, header)
      if options.include? :http_basic_authentication
        user, pass = options[:http_basic_authentication]
        req.basic_auth user, pass
      end
      http.request(req) {|response|
        resp = response
        if options[:content_length_proc] && Net::HTTPSuccess === resp
          if resp.key?('Content-Length')
            options[:content_length_proc].call(resp['Content-Length'].to_i)
          else
            options[:content_length_proc].call(nil)
          end
        end
        resp.read_body {|str|
          buf << str
          if options[:progress_proc] && Net::HTTPSuccess === resp
            options[:progress_proc].call(buf.size)
          end
          str.clear
        }
      }
    }
    io = buf.io
    io.rewind
    io.status = [resp.code, resp.message]
    resp.each_name {|name| buf.io.meta_add_field2 name, resp.get_fields(name) }
    case resp
    when Net::HTTPSuccess
    when Net::HTTPMovedPermanently, # 301
         Net::HTTPFound, # 302
         Net::HTTPSeeOther, # 303
         Net::HTTPTemporaryRedirect # 307
      begin
        loc_uri = URI.parse(resp['location'])
      rescue URI::InvalidURIError
        raise OpenURI::HTTPError.new(io.status.join(' ') + ' (Invalid Location URI)', io)
      end
      throw :open_uri_redirect, loc_uri
    else
      raise OpenURI::HTTPError.new(io.status.join(' '), io)
    end
  end

class HTTPError < StandardError
    def initialize(message, io)
      super(message)
      @io = io
    end
    attr_reader :io
  end

# Raised on redirection,
  # only occurs when +redirect+ option for HTTP is +false+.
  class HTTPRedirect < HTTPError
    def initialize(message, io, uri)
      super(message, io)
      @uri = uri
    end
    attr_reader :uri
  end

class Buffer # :nodoc: all
    def initialize
      @io = StringIO.new
      @size = 0
    end
    attr_reader :size

StringMax = 10240
    def <<(str)
      @io << str
      @size += str.length
      if StringIO === @io && StringMax < @size
        require 'tempfile'
        io = Tempfile.new('open-uri')
        io.binmode
        Meta.init io, @io if Meta === @io
        io << @io.string
        @io = io
      end
    end

def io
      Meta.init @io unless Meta === @io
      @io
    end
  end

# Mixin for holding meta-information.
  module Meta
    def Meta.init(obj, src=nil) # :nodoc:
      obj.extend Meta
      obj.instance_eval {
        @base_uri = nil
        @meta = {} # name to string.  legacy.
        @metas = {} # name to array of strings.
      }
      if src
        obj.status = src.status
        obj.base_uri = src.base_uri
        src.metas.each {|name, values|
          obj.meta_add_field2(name, values)
        }
      end
    end

# returns an Array that consists of status code and message.
    attr_accessor :status

# returns a URI that is the base of relative URIs in the data.
    # It may differ from the URI supplied by a user due to redirection.
    attr_accessor :base_uri

# returns a Hash that represents header fields.
    # The Hash keys are downcased for canonicalization.
    # The Hash values are a field body.
    # If there are multiple field with same field name,
    # the field values are concatenated with a comma.
    attr_reader :meta

# returns a Hash that represents header fields.
    # The Hash keys are downcased for canonicalization.
    # The Hash value are an array of field values.
    attr_reader :metas

def meta_setup_encoding # :nodoc:
      charset = self.charset
      enc = nil
      if charset
        begin
          enc = Encoding.find(charset)
        rescue ArgumentError
        end
      end
      enc = Encoding::ASCII_8BIT unless enc
      if self.respond_to? :force_encoding
        self.force_encoding(enc)
      elsif self.respond_to? :string
        self.string.force_encoding(enc)
      else # Tempfile
        self.set_encoding enc
      end
    end

def meta_add_field2(name, values) # :nodoc:
      name = name.downcase
      @metas[name] = values
      @meta[name] = values.join(', ')
      meta_setup_encoding if name == 'content-type'
    end

def meta_add_field(name, value) # :nodoc:
      meta_add_field2(name, [value])
    end

# returns a Time that represents the Last-Modified field.
    def last_modified
      if vs = @metas['last-modified']
        v = vs.join(', ')
        Time.httpdate(v)
      else
        nil
      end
    end

# :stopdoc:
    RE_LWS = /[\r\n\t ]+/n
    RE_TOKEN = %r{[^\x00- ()<>@,;:\\"/\[\]?={}\x7f]+}n
    RE_QUOTED_STRING = %r{"(?:[\r\n\t !#-\[\]-~\x80-\xff]|\\[\x00-\x7f])*"}n
    RE_PARAMETERS = %r{(?:;#{RE_LWS}?#{RE_TOKEN}#{RE_LWS}?=#{RE_LWS}?(?:#{RE_TOKEN}|#{RE_QUOTED_STRING})#{RE_LWS}?)*}n
    # :startdoc:

def content_type_parse # :nodoc:
      vs = @metas['content-type']
      # The last (?:;#{RE_LWS}?)? matches extra ";" which violates RFC2045.
      if vs && %r{\A#{RE_LWS}?(#{RE_TOKEN})#{RE_LWS}?/(#{RE_TOKEN})#{RE_LWS}?(#{RE_PARAMETERS})(?:;#{RE_LWS}?)?\z}no =~ vs.join(', ')
        type = $1.downcase
        subtype = $2.downcase
        parameters = []
        $3.scan(/;#{RE_LWS}?(#{RE_TOKEN})#{RE_LWS}?=#{RE_LWS}?(?:(#{RE_TOKEN})|(#{RE_QUOTED_STRING}))/no) {|att, val, qval|
          if qval
            val = qval[1...-1].gsub(/[\r\n\t !#-\[\]-~\x80-\xff]+|(\\[\x00-\x7f])/n) { $1 ? $1[1,1] : $& }
          end
          parameters << [att.downcase, val]
        }
        ["#{type}/#{subtype}", *parameters]
      else
        nil
      end
    end

# returns "type/subtype" which is MIME Content-Type.
    # It is downcased for canonicalization.
    # Content-Type parameters are stripped.
    def content_type
      type, *_ = content_type_parse
      type || 'application/octet-stream'
    end

# returns a charset parameter in Content-Type field.
    # It is downcased for canonicalization.
    #
    # If charset parameter is not given but a block is given,
    # the block is called and its result is returned.
    # It can be used to guess charset.
    #
    # If charset parameter and block is not given,
    # nil is returned except text type.
    # In that case, "utf-8" is returned as defined by RFC6838 4.2.1
    def charset
      type, *parameters = content_type_parse
      if pair = parameters.assoc('charset')
        pair.last.downcase
      elsif block_given?
        yield
      elsif type && %r{\Atext/} =~ type
        "utf-8" # RFC6838 4.2.1
      else
        nil
      end
    end

# Returns a list of encodings in Content-Encoding field as an array of
    # strings.
    #
    # The encodings are downcased for canonicalization.
    def content_encoding
      vs = @metas['content-encoding']
      if vs && %r{\A#{RE_LWS}?#{RE_TOKEN}#{RE_LWS}?(?:,#{RE_LWS}?#{RE_TOKEN}#{RE_LWS}?)*}o =~ (v = vs.join(', '))
        v.scan(RE_TOKEN).map {|content_coding| content_coding.downcase}
      else
        []
      end
    end
  end

# Mixin for HTTP and FTP URIs.
  module OpenRead
    # OpenURI::OpenRead#open provides `open' for URI::HTTP and URI::FTP.
    #
    # OpenURI::OpenRead#open takes optional 3 arguments as:
    #
    #   OpenURI::OpenRead#open([mode [, perm]] [, options]) [{|io| ... }]
    #
    # OpenURI::OpenRead#open returns an IO-like object if block is not given.
    # Otherwise it yields the IO object and return the value of the block.
    # The IO object is extended with OpenURI::Meta.
    #
    # +mode+ and +perm+ are the same as Kernel#open.
    #
    # However, +mode+ must be read mode because OpenURI::OpenRead#open doesn't
    # support write mode (yet).
    # Also +perm+ is ignored because it is meaningful only for file creation.
    #
    # +options+ must be a hash.
    #
    # Each option with a string key specifies an extra header field for HTTP.
    # I.e., it is ignored for FTP without HTTP proxy.
    #
    # The hash may include other options, where keys are symbols:
    #
    # [:proxy]
    #  Synopsis:
    #    :proxy => "http://proxy.foo.com:8000/"
    #    :proxy => URI.parse("http://proxy.foo.com:8000/")
    #    :proxy => true
    #    :proxy => false
    #    :proxy => nil
    #
    #  If :proxy option is specified, the value should be String, URI,
    #  boolean or nil.
    #
    #  When String or URI is given, it is treated as proxy URI.
    #
    #  When true is given or the option itself is not specified,
    #  environment variable `scheme_proxy' is examined.
    #  `scheme' is replaced by `http', `https' or `ftp'.
    #
    #  When false or nil is given, the environment variables are ignored and
    #  connection will be made to a server directly.
    #
    # [:proxy_http_basic_authentication]
    #  Synopsis:
    #    :proxy_http_basic_authentication =>
    #      ["http://proxy.foo.com:8000/", "proxy-user", "proxy-password"]
    #    :proxy_http_basic_authentication =>
    #      [URI.parse("http://proxy.foo.com:8000/"),
    #       "proxy-user", "proxy-password"]
    #
    #  If :proxy option is specified, the value should be an Array with 3
    #  elements.  It should contain a proxy URI, a proxy user name and a proxy
    #  password.  The proxy URI should be a String, an URI or nil.  The proxy
    #  user name and password should be a String.
    #
    #  If nil is given for the proxy URI, this option is just ignored.
    #
    #  If :proxy and :proxy_http_basic_authentication is specified,
    #  ArgumentError is raised.
    #
    # [:http_basic_authentication]
    #  Synopsis:
    #    :http_basic_authentication=>[user, password]
    #
    #  If :http_basic_authentication is specified,
    #  the value should be an array which contains 2 strings:
    #  username and password.
    #  It is used for HTTP Basic authentication defined by RFC 2617.
    #
    # [:content_length_proc]
    #  Synopsis:
    #    :content_length_proc => lambda {|content_length| ... }
    #
    #  If :content_length_proc option is specified, the option value procedure
    #  is called before actual transfer is started.
    #  It takes one argument, which is expected content length in bytes.
    #
    #  If two or more transfers are performed by HTTP redirection, the
    #  procedure is called only once for the last transfer.
    #
    #  When expected content length is unknown, the procedure is called with
    #  nil.  This happens when the HTTP response has no Content-Length header.
    #
    # [:progress_proc]
    #  Synopsis:
    #    :progress_proc => lambda {|size| ...}
    #
    #  If :progress_proc option is specified, the proc is called with one
    #  argument each time when `open' gets content fragment from network.
    #  The argument +size+ is the accumulated transferred size in bytes.
    #
    #  If two or more transfer is done by HTTP redirection, the procedure
    #  is called only one for a last transfer.
    #
    #  :progress_proc and :content_length_proc are intended to be used for
    #  progress bar.
    #  For example, it can be implemented as follows using Ruby/ProgressBar.
    #
    #    pbar = nil
    #    open("http://...",
    #      :content_length_proc => lambda {|t|
    #        if t && 0 < t
    #          pbar = ProgressBar.new("...", t)
    #          pbar.file_transfer_mode
    #        end
    #      },
    #      :progress_proc => lambda {|s|
    #        pbar.set s if pbar
    #      }) {|f| ... }
    #
    # [:read_timeout]
    #  Synopsis:
    #    :read_timeout=>nil     (no timeout)
    #    :read_timeout=>10      (10 second)
    #
    #  :read_timeout option specifies a timeout of read for http connections.
    #
    # [:open_timeout]
    #  Synopsis:
    #    :open_timeout=>nil     (no timeout)
    #    :open_timeout=>10      (10 second)
    #
    #  :open_timeout option specifies a timeout of open for http connections.
    #
    # [:ssl_ca_cert]
    #  Synopsis:
    #    :ssl_ca_cert=>filename or an Array of filenames
    #
    #  :ssl_ca_cert is used to specify CA certificate for SSL.
    #  If it is given, default certificates are not used.
    #
    # [:ssl_verify_mode]
    #  Synopsis:
    #    :ssl_verify_mode=>mode
    #
    #  :ssl_verify_mode is used to specify openssl verify mode.
    #
    # [:ftp_active_mode]
    #  Synopsis:
    #    :ftp_active_mode=>bool
    #
    #  <tt>:ftp_active_mode => true</tt> is used to make ftp active mode.
    #  Ruby 1.9 uses passive mode by default.
    #  Note that the active mode is default in Ruby 1.8 or prior.
    #
    # [:redirect]
    #  Synopsis:
    #    :redirect=>bool
    #
    #  +:redirect+ is true by default.  <tt>:redirect => false</tt> is used to
    #  disable all HTTP redirects.
    #
    #  OpenURI::HTTPRedirect exception raised on redirection.
    #  Using +true+ also means that redirections between http and ftp are
    #  permitted.
    #
    def open(*rest, &block)
      OpenURI.open_uri(self, *rest, &block)
    end

# OpenURI::OpenRead#read([options]) reads a content referenced by self and
    # returns the content as string.
    # The string is extended with OpenURI::Meta.
    # The argument +options+ is same as OpenURI::OpenRead#open.
    def read(options={})
      self.open(options) {|f|
        str = f.read
        Meta.init str, f
        str
      }
    end
  end
end

module URI
  class HTTP
    def buffer_open(buf, proxy, options) # :nodoc:
      OpenURI.open_http(buf, self, proxy, options)
    end

include OpenURI::OpenRead
  end

class FTP
    def buffer_open(buf, proxy, options) # :nodoc:
      if proxy
        OpenURI.open_http(buf, self, proxy, options)
        return
      end
      require 'net/ftp'

path = self.path
      path = path.sub(%r{\A/}, '%2F') # re-encode the beginning slash because uri library decodes it.
      directories = path.split(%r{/}, -1)
      directories.each {|d|
        d.gsub!(/%([0-9A-Fa-f][0-9A-Fa-f])/) { [$1].pack("H2") }
      }
      unless filename = directories.pop
        raise ArgumentError, "no filename: #{self.inspect}"
      end
      directories.each {|d|
        if /[\r\n]/ =~ d
          raise ArgumentError, "invalid directory: #{d.inspect}"
        end
      }
      if /[\r\n]/ =~ filename
        raise ArgumentError, "invalid filename: #{filename.inspect}"
      end
      typecode = self.typecode
      if typecode && /\A[aid]\z/ !~ typecode
        raise ArgumentError, "invalid typecode: #{typecode.inspect}"
      end

# The access sequence is defined by RFC 1738
      ftp = Net::FTP.new
      ftp.connect(self.hostname, self.port)
      ftp.passive = !options[:ftp_active_mode]
      # todo: extract user/passwd from .netrc.
      user = 'anonymous'
      passwd = nil
      user, passwd = self.userinfo.split(/:/) if self.userinfo
      ftp.login(user, passwd)
      directories.each {|cwd|
        ftp.voidcmd("CWD #{cwd}")
      }
      if typecode
        # xxx: typecode D is not handled.
        ftp.voidcmd("TYPE #{typecode.upcase}")
      end
      if options[:content_length_proc]
        options[:content_length_proc].call(ftp.size(filename))
      end
      ftp.retrbinary("RETR #{filename}", 4096) { |str|
        buf << str
        options[:progress_proc].call(buf.size) if options[:progress_proc]
      }
      ftp.close
      buf.io.rewind
    end

include OpenURI::OpenRead
  end
end

cmd: