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index.js
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index.js
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"use strict";
const {Resolver} = require("dns");
const ptr = require("ip-ptr");
const util = require("util");
const pMap = require("p-map");
const defaults = {
timeout: 5000,
servers: ["208.67.220.220"],
concurrency: 64,
};
async function query(addr, blacklist, resolver, opts) {
const resolve4 = util.promisify(resolver.resolve4.bind(resolver));
const name = ptr(addr, {suffix: false}) + "." + blacklist;
const timeout = setTimeout(() => {
resolver.cancel();
return false;
}, opts.timeout);
try {
const addrs = await resolve4(name);
clearTimeout(timeout);
return Boolean(addrs.length);
} catch (err) {
return false;
}
}
module.exports.lookup = async (addr, blacklist, opts = {}) => {
opts = Object.assign({}, defaults, opts);
const resolver = new Resolver();
resolver.setServers(Array.isArray(opts.servers) ? opts.servers : [opts.servers]);
const result = await query(addr, blacklist, resolver, opts);
return result;
};
module.exports.batch = async (addrs, lists, opts = {}) => {
opts = Object.assign({}, defaults, opts);
const items = [];
(Array.isArray(addrs) ? addrs : [addrs]).forEach(address => {
(Array.isArray(lists) ? lists : [lists]).forEach(blacklist => {
const resolver = new Resolver();
resolver.setServers(Array.isArray(opts.servers) ? opts.servers : [opts.servers]);
items.push({blacklist, address, resolver});
});
});
const results = await pMap(items, item => {
return query(item.address, item.blacklist, item.resolver, opts);
}, {concurrency: opts.concurrency});
return items.map((item, i) => {
item.listed = results[i];
delete item.resolver;
return item;
});
};