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import Limiter from 'ratelimiter';
import { redisClient } from '../../db/redis.js';
import { IEndpoint } from './endpoints.js';
import * as Acct from '@/misc/acct.js';
import { CacheableLocalUser, User } from '@/models/entities/user.js';
import Logger from '@/services/logger.js';
const logger = new Logger('limiter');
export const limiter = (endpoint: IEndpoint & { meta: { limit: NonNullable<IEndpoint['meta']['limit']> } }, user: CacheableLocalUser) => new Promise<void>((ok, reject) => {
const limitation = endpoint.meta.limit;
const key = Object.prototype.hasOwnProperty.call(limitation, 'key')
? limitation.key
: endpoint.name;
const hasShortTermLimit =
Object.prototype.hasOwnProperty.call(limitation, 'minInterval');
const hasLongTermLimit =
Object.prototype.hasOwnProperty.call(limitation, 'duration') &&
Object.prototype.hasOwnProperty.call(limitation, 'max');
if (hasShortTermLimit) {
min();
} else if (hasLongTermLimit) {
max();
} else {
ok();
}
// Short-term limit
function min(): void {
const minIntervalLimiter = new Limiter({
id: `${user.id}:${key}:min`,
duration: limitation.minInterval,
max: 1,
db: redisClient,
});
minIntervalLimiter.get((err, info) => {
if (err) {
return reject('ERR');
}
logger.debug(`@${Acct.toString(user)} ${endpoint.name} min remaining: ${info.remaining}`);
if (info.remaining === 0) {
reject('BRIEF_REQUEST_INTERVAL');
} else {
if (hasLongTermLimit) {
max();
} else {
ok();
}
}
});
}
// Long term limit
function max(): void {
const limiter = new Limiter({
id: `${user.id}:${key}`,
duration: limitation.duration,
max: limitation.max,
db: redisClient,
});
limiter.get((err, info) => {
if (err) {
return reject('ERR');
}
logger.debug(`@${Acct.toString(user)} ${endpoint.name} max remaining: ${info.remaining}`);
if (info.remaining === 0) {
reject('RATE_LIMIT_EXCEEDED');
} else {
ok();
}
});
}
});
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