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/**
* 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.session) { return this.error(new Error('Login sessions require session support. Did you forget to use `express-session` middleware?')); }
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;