84 lines
2.0 KiB
TypeScript
84 lines
2.0 KiB
TypeScript
import Limiter from 'ratelimiter';
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import { redisClient } from '../../db/redis.js';
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import { IEndpoint } from './endpoints.js';
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import * as Acct from '@/misc/acct.js';
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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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const logger = new Logger('limiter');
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export const limiter = (endpoint: IEndpoint & { meta: { limit: NonNullable<IEndpoint['meta']['limit']> } }, user: CacheableLocalUser) => new Promise<void>((ok, reject) => {
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const limitation = endpoint.meta.limit;
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const key = Object.prototype.hasOwnProperty.call(limitation, 'key')
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? limitation.key
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: endpoint.name;
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const hasShortTermLimit =
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Object.prototype.hasOwnProperty.call(limitation, 'minInterval');
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const hasLongTermLimit =
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Object.prototype.hasOwnProperty.call(limitation, 'duration') &&
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Object.prototype.hasOwnProperty.call(limitation, 'max');
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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: `${user.id}:${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(`@${Acct.toString(user)} ${endpoint.name} min remaining: ${info.remaining}`);
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if (info.remaining === 0) {
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reject('BRIEF_REQUEST_INTERVAL');
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} else {
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if (hasLongTermLimit) {
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max();
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} else {
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ok();
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}
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}
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});
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}
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// Long term limit
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function max(): void {
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const limiter = new Limiter({
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id: `${user.id}:${key}`,
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duration: limitation.duration,
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max: limitation.max,
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db: redisClient,
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});
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limiter.get((err, info) => {
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if (err) {
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return reject('ERR');
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}
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logger.debug(`@${Acct.toString(user)} ${endpoint.name} 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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