83 lines
1.7 KiB
TypeScript
83 lines
1.7 KiB
TypeScript
import * as Limiter from 'ratelimiter';
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import * as debug from 'debug';
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import limiterDB from '../db/redis';
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import { Endpoint } from './endpoints';
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import { IAuthContext } from './authenticate';
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const log = debug('misskey:limitter');
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export default (endpoint: Endpoint, ctx: IAuthContext) => new Promise((ok, reject) => {
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const limitation = endpoint.limit;
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const key = limitation.hasOwnProperty('key')
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? limitation.key
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: endpoint.name;
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const hasShortTermLimit =
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limitation.hasOwnProperty('minInterval');
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const hasLongTermLimit =
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limitation.hasOwnProperty('duration') &&
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limitation.hasOwnProperty('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() {
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const minIntervalLimiter = new Limiter({
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id: `${ctx.user._id}:${key}:min`,
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duration: limitation.minInterval,
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max: 1,
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db: limiterDB
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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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log(`@${ctx.user.username} ${endpoint.name} min remaining: ${info.remaining}`);
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if (info.remaining === 0) {
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reject('BRIEF_REQUEST_INTERVAL');
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} else {
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if (hasLongTermLimit) {
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max();
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} else {
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ok();
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}
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}
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});
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}
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// Long term limit
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function max() {
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const limiter = new Limiter({
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id: `${ctx.user._id}:${key}`,
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duration: limitation.duration,
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max: limitation.max,
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db: limiterDB
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});
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limiter.get((err, info) => {
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if (err) {
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return reject('ERR');
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}
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log(`@${ctx.user.username} ${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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