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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sh-3ll 1.0
DIR:/lib/node_modules/npm/node_modules/request/lib/
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Current File : //lib/node_modules/npm/node_modules/request/lib/oauth.js
'use strict'

var url = require('url')
var qs = require('qs')
var caseless = require('caseless')
var uuid = require('uuid/v4')
var oauth = require('oauth-sign')
var crypto = require('crypto')
var Buffer = require('safe-buffer').Buffer

function OAuth (request) {
  this.request = request
  this.params = null
}

OAuth.prototype.buildParams = function (_oauth, uri, method, query, form, qsLib) {
  var oa = {}
  for (var i in _oauth) {
    oa['oauth_' + i] = _oauth[i]
  }
  if (!oa.oauth_version) {
    oa.oauth_version = '1.0'
  }
  if (!oa.oauth_timestamp) {
    oa.oauth_timestamp = Math.floor(Date.now() / 1000).toString()
  }
  if (!oa.oauth_nonce) {
    oa.oauth_nonce = uuid().replace(/-/g, '')
  }
  if (!oa.oauth_signature_method) {
    oa.oauth_signature_method = 'HMAC-SHA1'
  }

  var consumer_secret_or_private_key = oa.oauth_consumer_secret || oa.oauth_private_key // eslint-disable-line camelcase
  delete oa.oauth_consumer_secret
  delete oa.oauth_private_key

  var token_secret = oa.oauth_token_secret // eslint-disable-line camelcase
  delete oa.oauth_token_secret

  var realm = oa.oauth_realm
  delete oa.oauth_realm
  delete oa.oauth_transport_method

  var baseurl = uri.protocol + '//' + uri.host + uri.pathname
  var params = qsLib.parse([].concat(query, form, qsLib.stringify(oa)).join('&'))

  oa.oauth_signature = oauth.sign(
    oa.oauth_signature_method,
    method,
    baseurl,
    params,
    consumer_secret_or_private_key, // eslint-disable-line camelcase
    token_secret // eslint-disable-line camelcase
  )

  if (realm) {
    oa.realm = realm
  }

  return oa
}

OAuth.prototype.buildBodyHash = function (_oauth, body) {
  if (['HMAC-SHA1', 'RSA-SHA1'].indexOf(_oauth.signature_method || 'HMAC-SHA1') < 0) {
    this.request.emit('error', new Error('oauth: ' + _oauth.signature_method +
      ' signature_method not supported with body_hash signing.'))
  }

  var shasum = crypto.createHash('sha1')
  shasum.update(body || '')
  var sha1 = shasum.digest('hex')

  return Buffer.from(sha1, 'hex').toString('base64')
}

OAuth.prototype.concatParams = function (oa, sep, wrap) {
  wrap = wrap || ''

  var params = Object.keys(oa).filter(function (i) {
    return i !== 'realm' && i !== 'oauth_signature'
  }).sort()

  if (oa.realm) {
    params.splice(0, 0, 'realm')
  }
  params.push('oauth_signature')

  return params.map(function (i) {
    return i + '=' + wrap + oauth.rfc3986(oa[i]) + wrap
  }).join(sep)
}

OAuth.prototype.onRequest = function (_oauth) {
  var self = this
  self.params = _oauth

  var uri = self.request.uri || {}
  var method = self.request.method || ''
  var headers = caseless(self.request.headers)
  var body = self.request.body || ''
  var qsLib = self.request.qsLib || qs

  var form
  var query
  var contentType = headers.get('content-type') || ''
  var formContentType = 'application/x-www-form-urlencoded'
  var transport = _oauth.transport_method || 'header'

  if (contentType.slice(0, formContentType.length) === formContentType) {
    contentType = formContentType
    form = body
  }
  if (uri.query) {
    query = uri.query
  }
  if (transport === 'body' && (method !== 'POST' || contentType !== formContentType)) {
    self.request.emit('error', new Error('oauth: transport_method of body requires POST ' +
      'and content-type ' + formContentType))
  }

  if (!form && typeof _oauth.body_hash === 'boolean') {
    _oauth.body_hash = self.buildBodyHash(_oauth, self.request.body.toString())
  }

  var oa = self.buildParams(_oauth, uri, method, query, form, qsLib)

  switch (transport) {
    case 'header':
      self.request.setHeader('Authorization', 'OAuth ' + self.concatParams(oa, ',', '"'))
      break

    case 'query':
      var href = self.request.uri.href += (query ? '&' : '?') + self.concatParams(oa, '&')
      self.request.uri = url.parse(href)
      self.request.path = self.request.uri.path
      break

    case 'body':
      self.request.body = (form ? form + '&' : '') + self.concatParams(oa, '&')
      break

    default:
      self.request.emit('error', new Error('oauth: transport_method invalid'))
  }
}

exports.OAuth = OAuth