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| import { Address6, Address4 } from "ip-address"; | |
| import dns from "node:dns"; | |
| export async function isURLLocal(URL: URL): Promise<boolean> { | |
| const isLocal = new Promise<boolean>((resolve, reject) => { | |
| dns.lookup(URL.hostname, (err, address, family) => { | |
| if (err) { | |
| reject(err); | |
| } | |
| if (family === 4) { | |
| const addr = new Address4(address); | |
| resolve(addr.isInSubnet(new Address4("127.0.0.0/8"))); | |
| } else if (family === 6) { | |
| const addr = new Address6(address); | |
| resolve( | |
| addr.isLoopback() || addr.isInSubnet(new Address6("::1/128")) || addr.isLinkLocal() | |
| ); | |
| } else { | |
| reject(new Error("Unknown IP family")); | |
| } | |
| }); | |
| }); | |
| return isLocal; | |
| } | |