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Viewing file:     session.js (2.03 KB)      -rw-r--r--

/**
 * Module dependencies.
 */
var pause = require('pause')
  , util = require('util')
  , Strategy = require('passport-strategy');


/**
 * `SessionStrategy` constructor.
 *
 * @api public
 */
function SessionStrategy(options, deserializeUser) {
  if (typeof options == 'function') {
    deserializeUser = options;
    options = undefined;
  }
  options = options || {};
  
  Strategy.call(this);
  this.name = 'session';
  this._key = options.key || 'passport';
  this._deserializeUser = deserializeUser;
}

/**
 * Inherit from `Strategy`.
 */
util.inherits(SessionStrategy, Strategy);

/**
 * Authenticate request based on the current session state.
 *
 * The session authentication strategy uses the session to restore any login
 * state across requests.  If a login session has been established, `req.user`
 * will be populated with the current user.
 *
 * This strategy is registered automatically by Passport.
 *
 * @param {Object} req
 * @param {Object} options
 * @api protected
 */
SessionStrategy.prototype.authenticate = function(req, options) {
  if (!req._passport) { return this.error(new Error('passport.initialize() middleware not in use')); }
  options = options || {};

  var self = this, 
      su;
  if (req.session[this._key]) {
    su = req.session[this._key].user;
  }

  if (su || su === 0) {
    // NOTE: Stream pausing is desirable in the case where later middleware is
    //       listening for events emitted from request.  For discussion on the
    //       matter, refer to: https://github.com/jaredhanson/passport/pull/106
    
    var paused = options.pauseStream ? pause(req) : null;
    this._deserializeUser(su, req, function(err, user) {
      if (err) { return self.error(err); }
      if (!user) {
        delete req.session[self._key].user;
      } else {
        var property = req._userProperty || 'user';
        req[property] = user;
      }
      self.pass();
      if (paused) {
        paused.resume();
      }
    });
  } else {
    self.pass();
  }
};


/**
 * Expose `SessionStrategy`.
 */
module.exports = SessionStrategy;