express-rate-limit-ioredis-store/dist/src/index.js

A redis store implementation to be used alongside ioredis for the express-rate-limit middleware

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
class ExpressRateLimitIORedisStore {
    constructor({ globalPrefix, client }) {
        this.client = client;
        this.globalPrefix = globalPrefix !== null && globalPrefix !== void 0 ? globalPrefix : 'express-rate-limit-store-';
        this.windowMs = 0;
    }
    init(options) {
        this.windowMs = options.windowMs;
    }
    async increment(key) {
        const redisKey = this.getFullKey(key);
        const totalHits = await this.client.incr(redisKey);
        const insertionTime = await this.getInsertionTime(redisKey, totalHits);
        const expiryTime = insertionTime + this.windowMs;
        await this.client.pexpireat(redisKey, expiryTime);
        return {
            totalHits,
            resetTime: new Date(expiryTime),
        };
    }
    async decrement(key) {
        const redisKey = this.getFullKey(key);
        if (await this.client.get(redisKey)) {
            await this.client.decr(redisKey);
        }
    }
    async resetKey(key) {
        await this.client.del(this.getFullKey(key));
    }
    getFullKey(key) {
        return this.globalPrefix + key;
    }
    async getInsertionTime(key, value) {
        const isKeyInsertion = value === 1;
        if (isKeyInsertion) {
            const now = new Date().getTime();
            await this.client.set(key + '-create-time', now);
            await this.client.pexpire(key + '-create-time', this.windowMs);
            return now;
        }
        const createTime = await this.client.get(key + '-create-time');
        return parseInt(createTime);
    }
}
exports.default = ExpressRateLimitIORedisStore;
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