Datasets:
File size: 1,001 Bytes
8d88d9b |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 |
import { Address6, Address4 } from "ip-address";
import dns from "node:dns";
const dnsLookup = (hostname: string): Promise<{ address: string; family: number }> => {
return new Promise((resolve, reject) => {
dns.lookup(hostname, (err, address, family) => {
if (err) return reject(err);
resolve({ address, family });
});
});
};
export async function isURLLocal(URL: URL): Promise<boolean> {
const { address, family } = await dnsLookup(URL.hostname);
if (family === 4) {
const addr = new Address4(address);
const localSubnet = new Address4("127.0.0.0/8");
return addr.isInSubnet(localSubnet);
}
if (family === 6) {
const addr = new Address6(address);
return addr.isLoopback() || addr.isInSubnet(new Address6("::1/128")) || addr.isLinkLocal();
}
throw Error("Unknown IP family");
}
export function isURLStringLocal(url: string) {
try {
const urlObj = new URL(url);
return isURLLocal(urlObj);
} catch (e) {
// assume local if URL parsing fails
return true;
}
}
|