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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,53 +1,69 @@ | ||
| import { RateLimiterMemory, RateLimiterRes, type IRateLimiterOptions } from "rate-limiter-flexible"; | ||
| import { createStorage, type Storage } from "unstorage"; | ||
| import fsDriver from "unstorage/drivers/fs"; | ||
| import { SlipAuthRateLimiterError } from "../errors/SlipAuthError"; | ||
| import memoryDriver from "unstorage/drivers/memory"; | ||
|
|
||
| export function createThrottlerStorage(base: string = "./.data/cache/ratelimit"): Storage<number> { | ||
| return createStorage<number>({ | ||
| driver: fsDriver({ base }), | ||
| export function createThrottlerStorage(): Storage<ThrottlingCounter> { | ||
| return createStorage<ThrottlingCounter>({ | ||
| driver: memoryDriver(), | ||
| }); | ||
| } | ||
|
|
||
| export class Throttler extends RateLimiterMemory { | ||
| storage: Storage<number>; | ||
| initialBlockDurationSeconds = 5; | ||
| #incrementFactor = 2; | ||
| /** | ||
| * @see https://github.com/pilcrowOnPaper/astro-email-password-2fa/blob/main/src/lib/server/rate-limit.ts | ||
| * | ||
| * added suport for unstorage | ||
| */ | ||
| export class Throttler { | ||
| public timeoutSeconds: number[]; | ||
|
|
||
| constructor(depOptions: IRateLimiterOptions, options: { storage: Storage<number>, initialBlockDurationSeconds?: number }) { | ||
| super(depOptions); | ||
| this.storage = options.storage; | ||
| this.initialBlockDurationSeconds = options.initialBlockDurationSeconds ?? this.initialBlockDurationSeconds; | ||
| public storage: Storage<ThrottlingCounter>; | ||
|
|
||
| constructor({ timeoutSeconds, storage }: { timeoutSeconds: number[], storage: Storage }) { | ||
| this.timeoutSeconds = timeoutSeconds; | ||
| this.storage = storage; | ||
| } | ||
|
|
||
| public async check(key: string): Promise< | ||
| [true] | [false, ThrottlingCounter] | ||
| > { | ||
| const counter = await this.storage.getItem(key) ?? null; | ||
| const now = Date.now(); | ||
| if (counter === null) { | ||
| return [true]; | ||
| } | ||
|
|
||
| const valid = now - counter.updatedAt >= this.timeoutSeconds[counter.timeout] * 1000; | ||
|
|
||
| if (valid) { | ||
| return [true]; | ||
| } | ||
| else { | ||
| return [false, counter]; | ||
| } | ||
| } | ||
|
|
||
| // eslint-disable-next-line @typescript-eslint/no-explicit-any | ||
| async consumeIncremental(key: string | number, pointsToConsume?: number, options?: { [key: string]: any }): Promise<RateLimiterRes | SlipAuthRateLimiterError> { | ||
| const strKey = key.toString(); | ||
| const cachedBlockDuration = await this.storage.getItem(strKey) ?? (this.initialBlockDurationSeconds / this.#incrementFactor); | ||
|
|
||
| return super.consume(strKey, pointsToConsume, options) | ||
| .then((res) => { | ||
| this.storage.setItem(strKey, cachedBlockDuration); | ||
|
|
||
| if (res.remainingPoints <= 0) { | ||
| this.block(strKey, cachedBlockDuration); | ||
| } | ||
|
|
||
| return res; | ||
| }) | ||
| .catch((error) => { | ||
| let msBeforeNext; | ||
|
|
||
| if (error instanceof RateLimiterRes && error.remainingPoints === 0) { | ||
| // Increase block duration and ensure it stays within the 32-bit signed integer range | ||
| const newBlockDuration = Math.min(cachedBlockDuration * 2, Number.MAX_SAFE_INTEGER); | ||
| this.storage.setItem(strKey, newBlockDuration); | ||
| msBeforeNext = newBlockDuration * 1000; | ||
| } | ||
|
|
||
| return new SlipAuthRateLimiterError({ | ||
| msBeforeNext: msBeforeNext, | ||
| }); | ||
| }); | ||
| public async increment(key: string): Promise<void> { | ||
| let counter = await this.storage.getItem(key) ?? null; | ||
|
|
||
| const now = Date.now(); | ||
| if (counter === null) { | ||
| counter = { | ||
| timeout: 0, | ||
| updatedAt: now, | ||
| }; | ||
| await this.storage.setItem(key, counter); | ||
| return; | ||
| } | ||
| counter.updatedAt = now; | ||
| counter.timeout = Math.min(counter.timeout + 1, this.timeoutSeconds.length - 1); | ||
| await this.storage.setItem(key, counter); | ||
| } | ||
|
|
||
| public async reset(key: string): Promise<void> { | ||
| await this.storage.removeItem(key); | ||
| } | ||
| } | ||
|
|
||
| interface ThrottlingCounter { | ||
| timeout: number | ||
| updatedAt: number | ||
| } |
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