76 lines
1.7 KiB
TypeScript
76 lines
1.7 KiB
TypeScript
import Limiter from 'ratelimiter';
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import { CacheableLocalUser, User } from '@/models/entities/user.js';
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import Logger from '@/services/logger.js';
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import { redisClient } from '../../db/redis.js';
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import { IEndpointMeta } from './endpoints.js';
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const logger = new Logger('limiter');
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export const limiter = (limitation: IEndpointMeta['limit'] & { key: NonNullable<string> }, actor: string) => new Promise<void>((ok, reject) => {
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const hasShortTermLimit = typeof limitation.minInterval === 'number';
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const hasLongTermLimit =
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typeof limitation.duration === 'number' &&
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typeof limitation.max === 'number';
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if (hasShortTermLimit) {
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min();
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} else if (hasLongTermLimit) {
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max();
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} else {
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ok();
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}
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// Short-term limit
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function min(): void {
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const minIntervalLimiter = new Limiter({
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id: `${actor}:${limitation.key}:min`,
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duration: limitation.minInterval,
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max: 1,
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db: redisClient,
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});
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minIntervalLimiter.get((err, info) => {
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if (err) {
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return reject('ERR');
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}
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logger.debug(`${actor} ${limitation.key} min remaining: ${info.remaining}`);
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if (info.remaining === 0) {
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reject('BRIEF_REQUEST_INTERVAL');
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} else {
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if (hasLongTermLimit) {
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max();
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} else {
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ok();
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}
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}
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});
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}
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// Long term limit
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function max(): void {
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const limiter = new Limiter({
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id: `${actor}:${limitation.key}`,
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duration: limitation.duration,
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max: limitation.max,
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db: redisClient,
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});
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limiter.get((err, info) => {
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if (err) {
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return reject('ERR');
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}
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logger.debug(`${actor} ${limitation.key} max remaining: ${info.remaining}`);
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if (info.remaining === 0) {
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reject('RATE_LIMIT_EXCEEDED');
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} else {
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ok();
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}
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});
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}
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});
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