101 lines
2.3 KiB
TypeScript
101 lines
2.3 KiB
TypeScript
import { Inject, Injectable } from '@nestjs/common';
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import Limiter from 'ratelimiter';
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import * as Redis from 'ioredis';
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import { DI } from '@/di-symbols.js';
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import type Logger from '@/logger.js';
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import { LoggerService } from '@/core/LoggerService.js';
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import { bindThis } from '@/decorators.js';
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import type { IEndpointMeta } from './endpoints.js';
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@Injectable()
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export class RateLimiterService {
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private logger: Logger;
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private disabled = false;
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constructor(
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@Inject(DI.redis)
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private redisClient: Redis.Redis,
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private loggerService: LoggerService,
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) {
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this.logger = this.loggerService.getLogger('limiter');
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if (process.env.NODE_ENV !== 'production') {
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this.disabled = true;
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}
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}
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@bindThis
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public limit(limitation: IEndpointMeta['limit'] & { key: NonNullable<string> }, actor: string, factor = 1) {
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return new Promise<void>((ok, reject) => {
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if (this.disabled) ok();
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// Short-term limit
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const 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! * factor,
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max: 1,
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db: this.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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this.logger.debug(`${actor} ${limitation.key} min remaining: ${info.remaining}`);
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if (info.remaining === 0) {
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reject('BRIEF_REQUEST_INTERVAL');
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} else {
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if (hasLongTermLimit) {
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max();
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} else {
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ok();
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}
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}
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});
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};
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// Long term limit
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const max = (): void => {
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const limiter = new Limiter({
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id: `${actor}:${limitation.key}`,
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duration: limitation.duration! * factor,
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max: limitation.max! / factor,
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db: this.redisClient,
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});
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limiter.get((err, info) => {
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if (err) {
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return reject('ERR');
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}
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this.logger.debug(`${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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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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});
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}
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}
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