Fix: Restore email change functionality

api-server/common/utils/auth.js

@@ -0,0 +1,80 @@
+import path from 'path';
+
+import dedent from 'dedent';
+import loopback from 'loopback';
+import moment from 'moment';
+
+export const renderSignUpEmail = loopback.template(
+  path.join(
+    __dirname,
+    '..',
+    '..',
+    'server',
+    'views',
+    'emails',
+    'user-request-sign-up.ejs'
+  )
+);
+
+export const renderSignInEmail = loopback.template(
+  path.join(
+    __dirname,
+    '..',
+    '..',
+    'server',
+    'views',
+    'emails',
+    'user-request-sign-in.ejs'
+  )
+);
+
+export const renderEmailChangeEmail = loopback.template(
+  path.join(
+    __dirname,
+    '..',
+    '..',
+    'server',
+    'views',
+    'emails',
+    'user-request-update-email.ejs'
+  )
+);
+
+export function getWaitPeriod(ttl) {
+  const fiveMinutesAgo = moment().subtract(5, 'minutes');
+  const lastEmailSentAt = moment(new Date(ttl || null));
+  const isWaitPeriodOver = ttl
+    ? lastEmailSentAt.isBefore(fiveMinutesAgo)
+    : true;
+
+  if (!isWaitPeriodOver) {
+    const minutesLeft = 5 - (moment().minutes() - lastEmailSentAt.minutes());
+    return minutesLeft;
+  }
+
+  return 0;
+}
+
+export function getWaitMessage(ttl) {
+  const minutesLeft = getWaitPeriod(ttl);
+  if (minutesLeft <= 0) {
+    return null;
+  }
+
+  const timeToWait = minutesLeft
+    ? `${minutesLeft} minute${minutesLeft > 1 ? 's' : ''}`
+    : 'a few seconds';
+
+  return dedent`
+    Please wait ${timeToWait} to resend an authentication link.
+  `;
+}
+
+export function getEncodedEmail(email) {
+  if (!email) {
+    return null;
+  }
+  return Buffer(email).toString('base64');
+}
+
+export const decodeEmail = email => Buffer(email, 'base64').toString();