📧 feat: email verification (#2344)

* feat: verification email

* chore: email verification invalid; localize: update

* fix: redirect to login when signup: fix: save emailVerified correctly

* docs: update ALLOW_UNVERIFIED_EMAIL_LOGIN; fix: don't accept login only when ALLOW_UNVERIFIED_EMAIL_LOGIN = true

* fix: user needs to be authenticated

* style: update

* fix: registration success message and redirect logic

* refactor: use `isEnabled` in ALLOW_UNVERIFIED_EMAIL_LOGIN

* refactor: move checkEmailConfig to server/utils

* refactor: use req as param for verifyEmail function

* chore: jsdoc

* chore: remove console log

* refactor: rename `createNewUser` to `createSocialUser`

* refactor: update typing and add expiresAt field to userSchema

* refactor: begin use of user methods over direct model access for User

* refactor: initial email verification rewrite

* chore: typing

* refactor: registration flow rewrite

* chore: remove help center text

* refactor: update getUser to getUserById and add findUser methods. general fixes from recent changes

* refactor: Update updateUser method to remove expiresAt field and use $set and $unset operations, createUser now returns Id only

* refactor: Update openidStrategy to use optional chaining for avatar check, move saveBuffer init to buffer condition

* refactor: logout on deleteUser mutatation

* refactor: Update openidStrategy login success message format

* refactor: Add emailVerified field to Discord and Facebook profile details

* refactor: move limiters to separate middleware dir

* refactor: Add limiters for email verification and password reset

* refactor: Remove getUserController and update routes and controllers accordingly

* refactor: Update getUserById method to exclude password and version fields

* refactor: move verification to user route, add resend verification option

* refactor: Improve email verification process and resend option

* refactor: remove more direct model access of User and remove unused code

* refactor: replace user authentication methods and token generation

* fix: add user.id to jwt user

* refactor: Update AuthContext to include setError function, add resend link to Login Form, make registration redirect shorter

* fix(updateUserPluginsService): ensure userPlugins variable is defined

* refactor: Delete all shared links for a specific user

* fix: remove use of direct User.save() in handleExistingUser

* fix(importLibreChatConvo): handle missing createdAt field in messages

---------

Co-authored-by: Danny Avila <danny@librechat.ai>

api/server/middleware/limiters/messageLimiters.js

@@ -0,0 +1,67 @@
+const rateLimit = require('express-rate-limit');
+const denyRequest = require('~/server/middleware/denyRequest');
+const { logViolation } = require('~/cache');
+
+const {
+  MESSAGE_IP_MAX = 40,
+  MESSAGE_IP_WINDOW = 1,
+  MESSAGE_USER_MAX = 40,
+  MESSAGE_USER_WINDOW = 1,
+} = process.env;
+
+const ipWindowMs = MESSAGE_IP_WINDOW * 60 * 1000;
+const ipMax = MESSAGE_IP_MAX;
+const ipWindowInMinutes = ipWindowMs / 60000;
+
+const userWindowMs = MESSAGE_USER_WINDOW * 60 * 1000;
+const userMax = MESSAGE_USER_MAX;
+const userWindowInMinutes = userWindowMs / 60000;
+
+/**
+ * Creates either an IP/User message request rate limiter for excessive requests
+ * that properly logs and denies the violation.
+ *
+ * @param {boolean} [ip=true] - Whether to create an IP limiter or a user limiter.
+ * @returns {function} A rate limiter function.
+ *
+ */
+const createHandler = (ip = true) => {
+  return async (req, res) => {
+    const type = 'message_limit';
+    const errorMessage = {
+      type,
+      max: ip ? ipMax : userMax,
+      limiter: ip ? 'ip' : 'user',
+      windowInMinutes: ip ? ipWindowInMinutes : userWindowInMinutes,
+    };
+
+    await logViolation(req, res, type, errorMessage);
+    return await denyRequest(req, res, errorMessage);
+  };
+};
+
+/**
+ * Message request rate limiter by IP
+ */
+const messageIpLimiter = rateLimit({
+  windowMs: ipWindowMs,
+  max: ipMax,
+  handler: createHandler(),
+});
+
+/**
+ * Message request rate limiter by userId
+ */
+const messageUserLimiter = rateLimit({
+  windowMs: userWindowMs,
+  max: userMax,
+  handler: createHandler(false),
+  keyGenerator: function (req) {
+    return req.user?.id; // Use the user ID or NULL if not available
+  },
+});
+
+module.exports = {
+  messageIpLimiter,
+  messageUserLimiter,
+};