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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#
# httpauth/basicauth.rb -- HTTP basic access authentication
#
# Author: IPR -- Internet Programming with Ruby -- writers
# Copyright (c) 2003 Internet Programming with Ruby writers. All rights
# reserved.
#
# $IPR: basicauth.rb,v 1.5 2003/02/20 07:15:47 gotoyuzo Exp $

require 'webrick/config'
require 'webrick/httpstatus'
require 'webrick/httpauth/authenticator'

module WEBrick
  module HTTPAuth
    class BasicAuth
      include Authenticator

      AuthScheme = "Basic"

      def self.make_passwd(realm, user, pass)
        pass ||= ""
        pass.crypt(Utils::random_string(2))
      end

      attr_reader :realm, :userdb, :logger

      def initialize(config, default=Config::BasicAuth)
        check_init(config)
        @config = default.dup.update(config)
      end

      def authenticate(req, res)
        unless basic_credentials = check_scheme(req)
          challenge(req, res)
        end
        userid, password = basic_credentials.unpack("m*")[0].split(":", 2) 
        password ||= ""
        if userid.empty?
          error("user id was not given.")
          challenge(req, res)
        end
        unless encpass = @userdb.get_passwd(@realm, userid, @reload_db)
          error("%s: the user is not allowed.", userid)
          challenge(req, res)
        end
        if password.crypt(encpass) != encpass
          error("%s: password unmatch.", userid)
          challenge(req, res)
        end
        info("%s: authentication succeeded.", userid)
        req.user = userid
      end

      def challenge(req, res)
        res[@response_field] = "#{@auth_scheme} realm=\"#{@realm}\""
        raise @auth_exception
      end
    end

    class ProxyBasicAuth < BasicAuth
      include ProxyAuthenticator
    end
  end
end