add javascript dns resolver using DoH
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j3d1 2024-04-08 20:54:29 +02:00
parent 6b5ccc2be6
commit 0fd49bc023

50
frontend/src/dns.js Normal file
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import {query} from 'dns-query';
function get_prefered_server() {
try {
const servers = JSON.parse(localStorage.getItem('dns-servers'));
if (servers && servers.length > 0) {
return servers;
}
} catch (e) {
console.error(e);
}
const request = new XMLHttpRequest();
request.open('GET', '/local/dns', false);
request.send(null);
if (request.status === 200) {
const servers = JSON.parse(request.responseText);
if (servers && servers.length > 0) {
return servers;
}
}
return ['1.1.1.1', '8.8.8.8'];
}
class FallBackResolver {
constructor() {
this._servers = get_prefered_server();
this._cache = JSON.parse(localStorage.getItem('dns-cache')) || {};
}
async query(domain, type) {
const key = domain + ':' + type;
if (key in this._cache && this._cache[key].time > Date.now() - 1000 * 60 * 60) {
const age_seconds = Math.ceil(Date.now() / 1000 - this._cache[key].time / 1000);
return [this._cache[key].data];
}
const result = await query(
{question: {type: type, name: domain}},
{
endpoints: this._servers,
}
)
if (result.answers.length === 0) throw new Error('No answer');
const first = result.answers[0];
this._cache[key] = {time: Date.now(), ...first}; // TODO hadle multiple answers
localStorage.setItem('dns-cache', JSON.stringify(this._cache));
return [first.data];
}
}
export default FallBackResolver;