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