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