70 lines
1.4 KiB
TypeScript
70 lines
1.4 KiB
TypeScript
import * as Limiter from 'ratelimiter';
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import limiterDB from '../db/redis';
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import { IEndpoint } from './endpoints';
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import { IAuthContext } from './authenticate';
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export default (endpoint: IEndpoint, ctx: IAuthContext) => new Promise((ok, reject) => {
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const limitKey = endpoint.hasOwnProperty('limitKey')
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? endpoint.limitKey
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: endpoint.name;
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const hasMinInterval =
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endpoint.hasOwnProperty('minInterval');
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const hasRateLimit =
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endpoint.hasOwnProperty('limitDuration') &&
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endpoint.hasOwnProperty('limitMax');
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if (hasMinInterval) {
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min();
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} else if (hasRateLimit) {
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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: `${ctx.user._id}:${limitKey}:min`,
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duration: endpoint.minInterval,
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max: 1,
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db: limiterDB
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});
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minIntervalLimiter.get((limitErr, limit) => {
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if (limitErr) {
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reject('ERR');
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} else if (limit.remaining === 0) {
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reject('BRIEF_REQUEST_INTERVAL');
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} else {
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if (hasRateLimit) {
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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: `${ctx.user._id}:${limitKey}`,
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duration: endpoint.limitDuration,
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max: endpoint.limitMax,
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db: limiterDB
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});
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limiter.get((limitErr, limit) => {
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if (limitErr) {
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reject('ERR');
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} else if (limit.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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