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