晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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DIR:/opt/alt/ruby18/lib64/ruby/1.8/webrick/httpauth/
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#
# httpauth/authenticator.rb -- Authenticator mix-in module.
#
# Author: IPR -- Internet Programming with Ruby -- writers
# Copyright (c) 2003 Internet Programming with Ruby writers. All rights
# reserved.
#
# $IPR: authenticator.rb,v 1.3 2003/02/20 07:15:47 gotoyuzo Exp $

module WEBrick
  module HTTPAuth
    module Authenticator
      RequestField      = "Authorization"
      ResponseField     = "WWW-Authenticate"
      ResponseInfoField = "Authentication-Info"
      AuthException     = HTTPStatus::Unauthorized
      AuthScheme        = nil # must override by the derived class

      attr_reader :realm, :userdb, :logger

      private

      def check_init(config)
        [:UserDB, :Realm].each{|sym|
          unless config[sym]
            raise ArgumentError, "Argument #{sym.inspect} missing."
          end
        } 
        @realm     = config[:Realm]
        @userdb    = config[:UserDB]
        @logger    = config[:Logger] || Log::new($stderr)
        @reload_db = config[:AutoReloadUserDB]
        @request_field   = self::class::RequestField
        @response_field  = self::class::ResponseField
        @resp_info_field = self::class::ResponseInfoField
        @auth_exception  = self::class::AuthException
        @auth_scheme     = self::class::AuthScheme
      end

      def check_scheme(req)
        unless credentials = req[@request_field]
          error("no credentials in the request.")
          return nil 
        end  
        unless match = /^#{@auth_scheme}\s+/.match(credentials)
          error("invalid scheme in %s.", credentials)
          info("%s: %s", @request_field, credentials) if $DEBUG
          return nil
        end
        return match.post_match
      end

      def log(meth, fmt, *args)
        msg = format("%s %s: ", @auth_scheme, @realm)
        msg << fmt % args
        @logger.send(meth, msg)
      end

      def error(fmt, *args)
        if @logger.error?
          log(:error, fmt, *args)
        end
      end                             

      def info(fmt, *args)
        if @logger.info?
          log(:info, fmt, *args)
        end
      end
    end

    module ProxyAuthenticator
      RequestField  = "Proxy-Authorization"
      ResponseField = "Proxy-Authenticate"
      InfoField     = "Proxy-Authentication-Info"
      AuthException = HTTPStatus::ProxyAuthenticationRequired
    end
  end
end