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diff --git a/tool/lib/webrick/httpauth.rb b/tool/lib/webrick/httpauth.rb
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+# frozen_string_literal: false
+#
+# httpauth.rb -- HTTP access authentication
+#
+# Author: IPR -- Internet Programming with Ruby -- writers
+# Copyright (c) 2000, 2001 TAKAHASHI Masayoshi, GOTOU Yuuzou
+# Copyright (c) 2002 Internet Programming with Ruby writers. All rights
+# reserved.
+#
+# $IPR: httpauth.rb,v 1.14 2003/07/22 19:20:42 gotoyuzo Exp $
+
+require_relative 'httpauth/basicauth'
+require_relative 'httpauth/digestauth'
+require_relative 'httpauth/htpasswd'
+require_relative 'httpauth/htdigest'
+require_relative 'httpauth/htgroup'
+
+module WEBrick
+
+  ##
+  # HTTPAuth provides both basic and digest authentication.
+  #
+  # To enable authentication for requests in WEBrick you will need a user
+  # database and an authenticator.  To start, here's an Htpasswd database for
+  # use with a DigestAuth authenticator:
+  #
+  #   config = { :Realm => 'DigestAuth example realm' }
+  #
+  #   htpasswd = WEBrick::HTTPAuth::Htpasswd.new 'my_password_file'
+  #   htpasswd.auth_type = WEBrick::HTTPAuth::DigestAuth
+  #   htpasswd.set_passwd config[:Realm], 'username', 'password'
+  #   htpasswd.flush
+  #
+  # The +:Realm+ is used to provide different access to different groups
+  # across several resources on a server.  Typically you'll need only one
+  # realm for a server.
+  #
+  # This database can be used to create an authenticator:
+  #
+  #   config[:UserDB] = htpasswd
+  #
+  #   digest_auth = WEBrick::HTTPAuth::DigestAuth.new config
+  #
+  # To authenticate a request call #authenticate with a request and response
+  # object in a servlet:
+  #
+  #   def do_GET req, res
+  #     @authenticator.authenticate req, res
+  #   end
+  #
+  # For digest authentication the authenticator must not be created every
+  # request, it must be passed in as an option via WEBrick::HTTPServer#mount.
+
+  module HTTPAuth
+    module_function
+
+    def _basic_auth(req, res, realm, req_field, res_field, err_type,
+                    block) # :nodoc:
+      user = pass = nil
+      if /^Basic\s+(.*)/o =~ req[req_field]
+        userpass = $1
+        user, pass = userpass.unpack("m*")[0].split(":", 2)
+      end
+      if block.call(user, pass)
+        req.user = user
+        return
+      end
+      res[res_field] = "Basic realm=\"#{realm}\""
+      raise err_type
+    end
+
+    ##
+    # Simple wrapper for providing basic authentication for a request.  When
+    # called with a request +req+, response +res+, authentication +realm+ and
+    # +block+ the block will be called with a +username+ and +password+.  If
+    # the block returns true the request is allowed to continue, otherwise an
+    # HTTPStatus::Unauthorized error is raised.
+
+    def basic_auth(req, res, realm, &block) # :yield: username, password
+      _basic_auth(req, res, realm, "Authorization", "WWW-Authenticate",
+                  HTTPStatus::Unauthorized, block)
+    end
+
+    ##
+    # Simple wrapper for providing basic authentication for a proxied request.
+    # When called with a request +req+, response +res+, authentication +realm+
+    # and +block+ the block will be called with a +username+ and +password+.
+    # If the block returns true the request is allowed to continue, otherwise
+    # an HTTPStatus::ProxyAuthenticationRequired error is raised.
+
+    def proxy_basic_auth(req, res, realm, &block) # :yield: username, password
+      _basic_auth(req, res, realm, "Proxy-Authorization", "Proxy-Authenticate",
+                  HTTPStatus::ProxyAuthenticationRequired, block)
+    end
+  end
+end