resolver-module-handshake/dist/index.js

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import tldEnum from "@lumeweb/tld-enum";
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import { AbstractResolverModule, DNS_RECORD_TYPE, isDomain, isIp, isPromise, normalizeDomain, resolverEmptyResponse, resolveSuccess, } from "@lumeweb/resolver-common";
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import { getTld } from "@lumeweb/resolver-common";
const HIP5_EXTENSIONS = ["eth", "_eth"];
export default class Handshake extends AbstractResolverModule {
async buildBlacklist() {
const blacklist = new Set();
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let resolvers = this.resolver.resolvers;
if (isPromise(resolvers)) {
resolvers = await resolvers;
}
for (const resolver of resolvers) {
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let tlds = resolver.getSupportedTlds();
if (isPromise(tlds)) {
tlds = await tlds;
}
tlds.map((item) => blacklist.add(item));
}
return blacklist;
}
async resolve(domain, options, bypassCache) {
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options.options = options.options || {};
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const tld = getTld(domain);
const blacklist = await this.buildBlacklist();
if (blacklist.has(tld)) {
return resolverEmptyResponse();
}
if (isIp(domain)) {
return resolverEmptyResponse();
}
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if (options?.options && "subquery" in options.options) {
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return resolverEmptyResponse();
}
const chainRecords = await this.query(tld, bypassCache);
if (!chainRecords) {
return resolverEmptyResponse();
}
let records = [];
for (const record of chainRecords) {
switch (record.type) {
case "NS": {
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await this.processNs(domain, record, records, chainRecords, options, bypassCache);
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break;
}
case "GLUE4": {
await this.processGlue(domain, record, records, options, bypassCache);
break;
}
case "TXT": {
await this.processTxt(record, records, options);
break;
}
case "SYNTH6": {
if (options.type === DNS_RECORD_TYPE.A &&
"ipv6" in options.options &&
options.options.ipv6) {
records.push({
type: options.type,
value: record.address,
});
}
break;
}
case "SYNTH4": {
if (options.type === DNS_RECORD_TYPE.A) {
records.push({
type: options.type,
value: record.address,
});
}
break;
}
default: {
break;
}
}
}
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records = [
...new Set(records.map((item) => JSON.stringify(item))),
].map((item) => JSON.parse(item));
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if (0 < records.length) {
return resolveSuccess(records);
}
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return resolverEmptyResponse();
}
// @ts-ignore
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async processNs(domain, record, records, hnsRecords, options, bypassCache) {
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if (![DNS_RECORD_TYPE.A, DNS_RECORD_TYPE.CNAME, DNS_RECORD_TYPE.NS].includes(options.type)) {
return;
}
// @ts-ignore
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const glue = hnsRecords.slice().find((item) =>
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// @ts-ignore
["GLUE4", "GLUE6"].includes(item.type) && item.ns === record.ns);
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if (glue && options.type !== DNS_RECORD_TYPE.NS) {
return this.processGlue(domain, glue, records, options, bypassCache);
}
if (options.type === DNS_RECORD_TYPE.NS) {
records.push({ type: options.type, value: record.ns });
return;
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}
const foundDomain = normalizeDomain(record.ns);
let isIcann = false;
let isHip5 = false;
let hip5Parts = foundDomain.split(".");
if (hip5Parts.length >= 2 &&
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[...(options.options?.hip5 ?? []), ...HIP5_EXTENSIONS].includes(hip5Parts[hip5Parts.length - 1])) {
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isHip5 = true;
}
if ((isDomain(foundDomain) || /[a-zA-Z0-9\-]+/.test(foundDomain)) &&
!isHip5) {
if (foundDomain.includes(".")) {
const tld = foundDomain.split(".")[foundDomain.split(".").length - 1];
isIcann = tldEnum.list.includes(tld);
}
if (!isIcann) {
const hnsNs = await this.resolver.resolve(foundDomain, options);
if (hnsNs.records.length) {
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let icannRecords = await this.resolver.resolve(domain, {
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...options,
options: {
subquery: true,
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nameserver: hnsNs.records.pop()?.value,
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},
});
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if (icannRecords.records.length) {
records.push.apply(records, icannRecords.records);
}
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}
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return resolverEmptyResponse();
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}
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let icannRecords = await this.resolver.resolve(domain, {
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...options,
options: { subquery: true, nameserver: foundDomain },
});
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if (icannRecords.records.length) {
records.push.apply(records, icannRecords.records);
return;
}
return resolverEmptyResponse();
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}
let result = await this.resolver.resolve(record.ns, options, bypassCache);
if (!result.records.length) {
result.records.push({ type: DNS_RECORD_TYPE.NS, value: record.ns });
return;
}
records.push.apply(records, result.records);
}
async processGlue(domain, record, records, options, bypassCache) {
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if (![DNS_RECORD_TYPE.A, DNS_RECORD_TYPE.CNAME].includes(options.type)) {
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return;
}
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if (isDomain(record.ns) && isIp(record.address)) {
let results = await this.resolver.resolve(domain, {
...options,
options: {
subquery: true,
nameserver: record.address,
},
}, bypassCache);
if (results.records.length) {
records.push.apply(records, results.records);
}
}
}
async query(tld, force) {
const query = this.resolver.rpcNetwork.query("getnameresource", "hns", [tld], force);
const resp = await query.result;
// @ts-ignore
return resp?.records || [];
}
async processTxt(record, records, options) {
const content = record.txt.slice().pop();
if ([DNS_RECORD_TYPE.TEXT, DNS_RECORD_TYPE.CONTENT].includes(options.type)) {
records.push({
type: DNS_RECORD_TYPE.TEXT,
value: content,
});
}
}
}