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const audit = require('../helper/audit');
const failureImpl = require('../restriction/failure');
const generatePassword = require('../fields/strongPassword')
.generate;
const json = require('body-parser')
.json();
const recaptchaImpl = require('../restriction/recaptcha');
const Auth = require('./Auth');
const LocalStrategy = require('passport-local');
/**
* Email based login.
*
* Requies ```passport-local``` package.
*/
class EmailAuth extends Auth
{
/**
* @param {object} options see Auth class + additional options for email configuration.
* @property {number} [options.tokenExpxiryMinutes=10] number of minutes to restrict token exchange to for passwordless login
*/
constructor(options)
{
super('email', options);
/**
* Instance of email sender class for sending emails.
*
* If this is not specified, email login is disabled.
*
* @type {EmailSender}
*/
this.emailSender = options.emailSender;
/**
* Instance of crypt class for encrypting and verifying passwords.
*
* @type {Crypt}
*/
this.crypt = options.crypt;
/**
* Name of application.
* Used for sending email.
* @type {string}
*/
this.applicationName = options.applicationName || 'Account';
/**
* Email from address
* Used for sending email.
* @type {string}
*/
this.fromAddress = options.fromAddress || 'no-thanks@reply-factory.com';
this.description.usesPassword = true;
this.description.tokenExpiryMinutes = options.tokenExpiryMinutes || 10;
/**
* @private
*/
this.tokenExpiryMilliseconds = this.description.tokenExpiryMinutes * 60 * 1000;
/**
* Settings for rate limiting failed requests.
*
* Note: use this or recaptcha.
*/
this.block = options.block || undefined;
/**
* Settings for rate limiting through recaptcha.
*
* Note: use this or recaptcha.
*/
this.recaptcha = options.recaptcha || undefined;
Iif (this.recaptcha)
{
if (this.recaptcha.publicKey)
{
this.description.recaptcha = this.recaptcha.publicKey;
}
else
{
this.recaptcha = undefined;
}
}
/**
* If true, it remembers any passwords specified registration.
*/
this.allowPasswordSettingDuringRegistration = options.allowPasswordSettingDuringRegistration || false;
}
/**
* logs users in based on token or based on username(email)/password
*/
async strategyImpl(req, username, password, done)
{
const defaultErrorMsg = this.defaultErrorMsg;
// call if unsuccessful
function error(msg, detailed = undefined)
{
req.audit(audit.LOGIN_FAILURE, msg, detailed);
Eif (typeof msg === 'string')
{
msg = {
error: defaultErrorMsg || msg
};
}
done(null, msg);
}
// expire aged tokens
// const now = Date.now();
// // passwordless login
// if (tokens[username])
// {
// if (tokens[username].password === password)
// {
// const profile = await this.createProfileFromCredential(username, tokens[username].extra);
//
// delete tokens[username];
//
// this.handleUserLoginByProfile(username, profile, done, req);
// }
// }
const user = this.findUser(username);
if (user && user.loginToken)
{
Iif (Date.now() > user.loginToken.expires)
{
delete user.loginToken;
await this.users.updateRecord(user);
}
else Eif (user.loginToken.password === password)
{
const profile = await this.createProfileFromCredential(username, user.loginToken.extra);
const update = this.createUserFromProfile(profile);
delete user.loginToken;
delete update.id;
Object.assign(user, update);
await this.users.updateRecord(user);
done(null, user);
return
}
}
if (user && user.credentials) // if found, log in found account
{
for (let credential of user.credentials)
{
Eif (credential.type === this.method && credential.value === username && user.password)
{
this.crypt.verify(password, user.password)
.then((verified) =>
{
if (verified)
{
done(null, user);
}
else
{
error('Email and password combination not found.', username);
}
}, done);
return;
}
}
}
error('Email and password combination not found.', username);
}
/**
* sends temporary login password to email address
*/
async passwordlessImpl(req, res)
{
const defaultErrorMsg = this.defaultErrorMsg;
// call if unsuccessful
function error(msg, auditStr, detailed = undefined)
{
req.audit(auditStr, msg, detailed);
return res.error(defaultErrorMsg || msg, audit.LOGIN_FAILURE);
}
try
{
const username = req.body.username;
Iif (!req.body.username || typeof req.body.username !== 'string')
{
return error('Username not specified', audit.LOGIN_FAILURE, req.body);
}
const temporaryPassword = generatePassword();
const theme = req.params.theme || 'login';
await this.sendTemporaryPassword(theme, username, temporaryPassword, this.description.tokenExpiryMinutes, req.body.loginLinkPrefix);
let user = this.findUser(username);
let update = user ? this.users.updateRecord : this.users.createRecord;
if (!user)
{
user = {
id: this.generateId(),
credentials: [{
type: 'email',
value: username
}]
};
}
user.loginToken = {
password: temporaryPassword,
expires: Date.now() + this.tokenExpiryMilliseconds,
extra: req.body,
};
await update.call(this.users, user);
res.success('A login email has been sent to email address.', audit.LOGIN, username);
}
catch (e)
{
error('Error sending email. Please verify that your address is correct and is valid.', audit.LOGIN_FAILURE, e);
}
}
/**
* @override
*/
install(app, prefix, passport)
{
// Protect methods with restriction.
// Verify does not need it as we are doing simple memory lookup in small
// sized table. May still be an issue unless we receive enough registrations
// to fill up memory.
const limit = this.block ? failureImpl(this.block) : recaptchaImpl(this.recaptcha);
passport.use(new LocalStrategy({
passReqToCallback: true,
}, this.strategyImpl.bind(this)));
app.all([`${prefix}/login.json`,
`${prefix}/verify.json`
],
json,
limit,
passport.authenticate('local', this.authenticateOptions),
this.loggedIn());
// PASSWORDLESS LOGIN
if (this.emailSender)
{
app.all(`${prefix}/:theme.json`, json, limit, this.passwordlessImpl.bind(this));
}
}
/**
* helper method that creates a profile object from a credential address
*/
async createProfileFromCredential(id, extra = {})
{
const profile = await super.createProfileFromCredential(id, extra);
if (extra.password && this.crypt)
{
profile.password = await this.crypt.hash(extra.password);
}
return profile;
}
/**
* Override of helper method that inserts password into produced user
* if allowed by setting.
*
* @override
*/
createUserFromProfile(profile)
{
// we allow password setting
let user = super.createUserFromProfile(profile);
if (profile.password && this.allowPasswordSettingDuringRegistration)
{
user.password = profile.password;
}
return user;
}
/**
* Helper method that sends temporary password to an email address for rego/login.
*
* Should be able to override this to specify custom formats for email.
*
* @param {string} theme register | recover | passwordless etc. anything other than login or verify
* @param {string} to target email address
* @param {string} password temporary login token
* @param {number} expireMinutes number of minutes after which this login token will expire
* @param {string} [loginLinkPrefix] forward url for any links in email
*/
sendTemporaryPassword(theme, to, password, expireMinutes, loginLinkPrefix)
{
let subject = `${this.applicationName}`;
switch (theme)
{
case 'register':
subject += ' Registration';
break;
case 'recover':
subject += ' Account Recovery';
break;
default:
subject += ' Login';
break;
}
let message = '';
message += `<p>You have received this email because someone requested access to the ${this.applicationName} using this email address.</p>\n`;
if (theme === 'register' && loginLinkPrefix)
{
message += `<p>Use the following link to verify this email address and complete your registration: <a href="${loginLinkPrefix}${password}">verify</a>.</p>\n`;
}
else if (theme === 'recover' && loginLinkPrefix)
{
message += `<p>Use the following link to log into the system to change your password: <a href="${loginLinkPrefix}${password}">login</a>.</p>\n`;
}
else
if (loginLinkPrefix)
{
message += `<p>Use the following link to log into the system: <a href="${loginLinkPrefix}${password}">login</a>.</p>\n`;
message += `<p>Alternatively, you can use the following password: ${password}</p>\n`;
message += `<p>Note: this link and password will expire within ${expireMinutes} minutes of request time.</p>\n`;
}
else
{
message += `<p>Use the following password to log into the system: ${password}</p>\n`;
message += `<p>Note: this password will expire within ${expireMinutes} minutes of request time.</p>\n`;
}
message += `<p>If this is not you, please contact system administrators.</p>\n`;
message += `<p>Kind Regards,</p>\n`;
message += `<p>${this.applicationName} Team</p>\n`;
message += `<p></p>\n`;
message += `<p>WARNING: This is an automaticly generated email. Do not reploy to it.</p>\n`;
return this.emailSender.send(to, this.fromAddress, subject, message);
}
}
module.exports = EmailAuth;
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