GoogleOauth2.0 First implementation

First try for GoogleOauth2.0

express-server/node_modules/cookie-session/index.js

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+/*!
+ * cookie-session
+ * Copyright(c) 2013 Jonathan Ong
+ * Copyright(c) 2014-2017 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict'
+
+/**
+ * Module dependencies.
+ * @private
+ */
+
+var Buffer = require('safe-buffer').Buffer
+var debug = require('debug')('cookie-session')
+var Cookies = require('cookies')
+var onHeaders = require('on-headers')
+
+/**
+ * Module exports.
+ * @public
+ */
+
+module.exports = cookieSession
+
+/**
+ * Create a new cookie session middleware.
+ *
+ * @param {object} [options]
+ * @param {boolean} [options.httpOnly=true]
+ * @param {array} [options.keys]
+ * @param {string} [options.name=session] Name of the cookie to use
+ * @param {boolean} [options.overwrite=true]
+ * @param {string} [options.secret]
+ * @param {boolean} [options.signed=true]
+ * @return {function} middleware
+ * @public
+ */
+
+function cookieSession (options) {
+  var opts = options || {}
+
+  // cookie name
+  var name = opts.name || 'session'
+
+  // secrets
+  var keys = opts.keys
+  if (!keys && opts.secret) keys = [opts.secret]
+
+  // defaults
+  if (opts.overwrite == null) opts.overwrite = true
+  if (opts.httpOnly == null) opts.httpOnly = true
+  if (opts.signed == null) opts.signed = true
+
+  if (!keys && opts.signed) throw new Error('.keys required.')
+
+  debug('session options %j', opts)
+
+  return function _cookieSession (req, res, next) {
+    var cookies = new Cookies(req, res, {
+      keys: keys
+    })
+    var sess
+
+    // to pass to Session()
+    req.sessionCookies = cookies
+    req.sessionOptions = Object.create(opts)
+    req.sessionKey = name
+
+    // define req.session getter / setter
+    Object.defineProperty(req, 'session', {
+      configurable: true,
+      enumerable: true,
+      get: getSession,
+      set: setSession
+    })
+
+    function getSession () {
+      // already retrieved
+      if (sess) {
+        return sess
+      }
+
+      // unset
+      if (sess === false) {
+        return null
+      }
+
+      // get or create session
+      return (sess = tryGetSession(req) || createSession(req))
+    }
+
+    function setSession (val) {
+      if (val == null) {
+        // unset session
+        sess = false
+        return val
+      }
+
+      if (typeof val === 'object') {
+        // create a new session
+        sess = Session.create(this, val)
+        return sess
+      }
+
+      throw new Error('req.session can only be set as null or an object.')
+    }
+
+    onHeaders(res, function setHeaders () {
+      if (sess === undefined) {
+        // not accessed
+        return
+      }
+
+      try {
+        if (sess === false) {
+          // remove
+          cookies.set(name, '', req.sessionOptions)
+        } else if ((!sess.isNew || sess.isPopulated) && sess.isChanged) {
+          // save populated or non-new changed session
+          sess.save()
+        }
+      } catch (e) {
+        debug('error saving session %s', e.message)
+      }
+    })
+
+    next()
+  }
+};
+
+/**
+ * Session model.
+ *
+ * @param {Context} ctx
+ * @param {Object} obj
+ * @private
+ */
+
+function Session (ctx, obj) {
+  Object.defineProperty(this, '_ctx', {
+    value: ctx
+  })
+
+  if (obj) {
+    for (var key in obj) {
+      this[key] = obj[key]
+    }
+  }
+}
+
+/**
+ * Create new session.
+ * @private
+ */
+
+Session.create = function create (req, obj) {
+  var ctx = new SessionContext(req)
+  return new Session(ctx, obj)
+}
+
+/**
+ * Create session from serialized form.
+ * @private
+ */
+
+Session.deserialize = function deserialize (req, str) {
+  var ctx = new SessionContext(req)
+  var obj = decode(str)
+
+  ctx._new = false
+  ctx._val = str
+
+  return new Session(ctx, obj)
+}
+
+/**
+ * Serialize a session to a string.
+ * @private
+ */
+
+Session.serialize = function serialize (sess) {
+  return encode(sess)
+}
+
+/**
+ * Return if the session is changed for this request.
+ *
+ * @return {Boolean}
+ * @public
+ */
+
+Object.defineProperty(Session.prototype, 'isChanged', {
+  get: function getIsChanged () {
+    return this._ctx._new || this._ctx._val !== Session.serialize(this)
+  }
+})
+
+/**
+ * Return if the session is new for this request.
+ *
+ * @return {Boolean}
+ * @public
+ */
+
+Object.defineProperty(Session.prototype, 'isNew', {
+  get: function getIsNew () {
+    return this._ctx._new
+  }
+})
+
+/**
+ * Return how many values there are in the session object.
+ * Used to see if it's "populated".
+ *
+ * @return {Number}
+ * @public
+ */
+
+Object.defineProperty(Session.prototype, 'length', {
+  get: function getLength () {
+    return Object.keys(this).length
+  }
+})
+
+/**
+ * populated flag, which is just a boolean alias of .length.
+ *
+ * @return {Boolean}
+ * @public
+ */
+
+Object.defineProperty(Session.prototype, 'isPopulated', {
+  get: function getIsPopulated () {
+    return Boolean(this.length)
+  }
+})
+
+/**
+ * Save session changes by performing a Set-Cookie.
+ * @private
+ */
+
+Session.prototype.save = function save () {
+  var ctx = this._ctx
+  var val = Session.serialize(this)
+
+  var cookies = ctx.req.sessionCookies
+  var name = ctx.req.sessionKey
+  var opts = ctx.req.sessionOptions
+
+  debug('save %s', val)
+  cookies.set(name, val, opts)
+}
+
+/**
+ * Session context to tie session to req.
+ *
+ * @param {Request} req
+ * @private
+ */
+
+function SessionContext (req) {
+  this.req = req
+
+  this._new = true
+  this._val = undefined
+}
+
+/**
+ * Create a new session.
+ * @private
+ */
+
+function createSession (req) {
+  debug('new session')
+  return Session.create(req)
+}
+
+/**
+ * Decode the base64 cookie value to an object.
+ *
+ * @param {String} string
+ * @return {Object}
+ * @private
+ */
+
+function decode (string) {
+  var body = Buffer.from(string, 'base64').toString('utf8')
+  return JSON.parse(body)
+}
+
+/**
+ * Encode an object into a base64-encoded JSON string.
+ *
+ * @param {Object} body
+ * @return {String}
+ * @private
+ */
+
+function encode (body) {
+  var str = JSON.stringify(body)
+  return Buffer.from(str).toString('base64')
+}
+
+/**
+ * Try getting a session from a request.
+ * @private
+ */
+
+function tryGetSession (req) {
+  var cookies = req.sessionCookies
+  var name = req.sessionKey
+  var opts = req.sessionOptions
+
+  var str = cookies.get(name, opts)
+
+  if (!str) {
+    return undefined
+  }
+
+  debug('parse %s', str)
+
+  try {
+    return Session.deserialize(req, str)
+  } catch (err) {
+    return undefined
+  }
+}