strategy.js
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/**
* Module dependencies.
*/
var passport = require('passport-strategy')
, util = require('util')
, lookup = require('./utils').lookup;
/**
* `Strategy` constructor.
*
* The local authentication strategy authenticates requests based on the
* credentials submitted through an HTML-based login form.
*
* Applications must supply a `verify` callback which accepts `username` and
* `password` credentials, and then calls the `done` callback supplying a
* `user`, which should be set to `false` if the credentials are not valid.
* If an exception occured, `err` should be set.
*
* Optionally, `options` can be used to change the fields in which the
* credentials are found.
*
* Options:
* - `usernameField` field name where the username is found, defaults to _username_
* - `passwordField` field name where the password is found, defaults to _password_
* - `passReqToCallback` when `true`, `req` is the first argument to the verify callback (default: `false`)
*
* Examples:
*
* passport.use(new LocalStrategy(
* function(username, password, done) {
* User.findOne({ username: username, password: password }, function (err, user) {
* done(err, user);
* });
* }
* ));
*
* @param {Object} options
* @param {Function} verify
* @api public
*/
function Strategy(options, verify) {
if (typeof options == 'function') {
verify = options;
options = {};
}
if (!verify) { throw new TypeError('LocalStrategy requires a verify callback'); }
this._usernameField = options.usernameField || 'username';
this._passwordField = options.passwordField || 'password';
passport.Strategy.call(this);
this.name = 'local';
this._verify = verify;
this._passReqToCallback = options.passReqToCallback;
}
/**
* Inherit from `passport.Strategy`.
*/
util.inherits(Strategy, passport.Strategy);
/**
* Authenticate request based on the contents of a form submission.
*
* @param {Object} req
* @api protected
*/
Strategy.prototype.authenticate = function(req, options) {
options = options || {};
var username = lookup(req.body, this._usernameField) || lookup(req.query, this._usernameField);
var password = lookup(req.body, this._passwordField) || lookup(req.query, this._passwordField);
if (!username || !password) {
return this.fail({ message: options.badRequestMessage || 'Missing credentials' }, 400);
}
var self = this;
function verified(err, user, info) {
if (err) { return self.error(err); }
if (!user) { return self.fail(info); }
self.success(user, info);
}
try {
if (self._passReqToCallback) {
this._verify(req, username, password, verified);
} else {
this._verify(username, password, verified);
}
} catch (ex) {
return self.error(ex);
}
};
/**
* Expose `Strategy`.
*/
module.exports = Strategy;