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-rw-r--r--src/middlewares/GlobalRateLimit.ts43
-rw-r--r--src/middlewares/RateLimit.ts40
2 files changed, 83 insertions, 0 deletions
diff --git a/src/middlewares/GlobalRateLimit.ts b/src/middlewares/GlobalRateLimit.ts
new file mode 100644

index 00000000..5c5f690a --- /dev/null +++ b/src/middlewares/GlobalRateLimit.ts
@@ -0,0 +1,43 @@ +import { NextFunction, Request, Response } from "express"; +import Config from "../util/Config"; +import db from "../util/Database"; + +export async function GlobalRateLimit(req: Request, res: Response, next: NextFunction) { + if (!Config.get().server.ipRateLimit.enabled) return next(); + + const ip = getIpAdress(req); + let limit = (await db.data.ratelimit.global[ip].get()) || { start: Date.now(), count: 0 }; + if (limit.start < Date.now() - Config.get().server.ipRateLimit.timespan) { + limit.start = Date.now(); + limit.count = 0; + } + + if (limit.count > Config.get().server.ipRateLimit.count) { + const timespan = Date.now() - limit.start; + + return res + .set("Retry-After", `${timespan.toFixed(0)}`) + .set("X-RateLimit-Global", "true") + .status(429) + .json({ + message: "You are being rate limited.", + retry_after: timespan, + global: true, + }); + } + + res.once("close", async () => { + if (res.statusCode >= 400) { + limit.count++; + await db.data.ratelimit.global[ip].set(limit); + } + }); + + return next(); +} + +export function getIpAdress(req: Request): string { + const { forwadedFor } = Config.get().server; + const ip = forwadedFor ? <string>req.headers[forwadedFor] : req.ip; + return ip.replaceAll(".", "_").replaceAll(":", "_"); +} diff --git a/src/middlewares/RateLimit.ts b/src/middlewares/RateLimit.ts new file mode 100644
index 00000000..abfc1c3d --- /dev/null +++ b/src/middlewares/RateLimit.ts
@@ -0,0 +1,40 @@ +import { NextFunction, Request, Response } from "express"; +import db from "../util/Database"; +import { getIpAdress } from "./GlobalRateLimit"; + +export function RateLimit({ count = 10, timespan = 1000 * 5, name = "/" }) { + return async (req: Request, res: Response, next: NextFunction) => { + let id = req.userid || getIpAdress(req); // TODO: .replaceAll(".", "_"); // for ip adress replace all dots to save in database + + const limit: { count: number; start: number } = (await db.data.ratelimit.routes[name][id].get()) || { + count: 0, + start: Date.now(), + }; + + if (limit.start < Date.now() - timespan) { + limit.start = Date.now(); + limit.count = 0; + } + + if (limit.count > count) { + const wait = Date.now() - limit.start; + + return res + .set("Retry-After", `${wait.toFixed(0)}`) + .set("X-RateLimit-Limit", `${count}`) + .set("X-RateLimit-Remaining", "0") + .set("X-RateLimit-Reset", `${limit.start + wait}`) + .set("X-RateLimit-Reset-After", `${wait}`) + .set("X-RateLimit-Bucket", name) + .set("X-RateLimit-Global", "false") + .status(429) + .json({ + message: "You are being rate limited.", + retry_after: wait, + global: false, + }); + } + + return next(); + }; +}