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qwen/nodejs/node_modules/passport/lib/strategies/session.js

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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;