@nodesecure/contact/dist/NsResolver.class.js

Utilities to extract/fetch data on NPM contacts (author, maintainers ..)

// Import Node.js Dependencies
import { Resolver } from "node:dns/promises";
export class NsResolver {
    #dns = new Resolver();
    #emails = new Set();
    constructor() {
        this.#dns.setServers([
            "1.1.1.1",
            "8.8.8.8"
        ]);
    }
    registerEmail(email) {
        // eslint-disable-next-line no-eq-null
        if (email == null || email.trim() === "") {
            return;
        }
        this.#emails.add(email);
    }
    async #resolveNs(email) {
        const hostname = email.split("@")[1];
        try {
            await this.#dns.resolveNs(hostname);
            return null;
        }
        catch {
            return email;
        }
    }
    async getExpired() {
        const emails = Array.from(this.#emails);
        const promises = emails.map((email) => this.#resolveNs(email));
        const expiredEmails = (await Promise.all(promises))
            .flatMap((email) => (email === null ? [] : [email]));
        return expiredEmails;
    }
}
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