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import * as Limiter from 'ratelimiter';
import * as debug from 'debug';
import limiterDB from '../../db/redis';
import { IEndpoint } from './endpoints';
import getAcct from '../../misc/acct/render';
import { IUser } from '../../models/user';
const log = debug('misskey:limitter');
export default (endpoint: IEndpoint, user: IUser) => new Promise((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: limiterDB
});
minIntervalLimiter.get((err, info) => {
if (err) {
return reject('ERR');
}
log(`@${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}:${key}`,
duration: limitation.duration,
max: limitation.max,
db: limiterDB
});
limiter.get((err, info) => {
if (err) {
return reject('ERR');
}
log(`@${getAcct(user)} ${endpoint.name} max remaining: ${info.remaining}`);
if (info.remaining === 0) {
reject('RATE_LIMIT_EXCEEDED');
} else {
ok();
}
});
}
});
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