refactor: handle more situations
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2f25241943
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C997C339BE476FF2
225
src/resolver.ts
225
src/resolver.ts
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@ -33,6 +33,40 @@ interface HnsRecord {
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}
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export default class Handshake extends AbstractResolverModule {
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async 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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options.options = options.options || {};
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if (await this.shouldBypassResolution(domain)) {
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return resolverEmptyResponse();
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}
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const chainRecords = await this.query(getTld(domain));
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if (chainRecords.error) {
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return resolverError(chainRecords.error);
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}
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const hnsRecords = chainRecords.result?.records;
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if (!hnsRecords || !hnsRecords.length) {
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return resolverEmptyResponse();
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}
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let records = await this.processRecords(
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hnsRecords,
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options,
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domain,
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bypassCache,
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);
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records = ensureUniqueRecords(records);
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return records.length > 0
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? resolveSuccess(records)
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: resolverEmptyResponse();
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}
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private async buildBlacklist(): Promise<Set<string>> {
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const blacklist = new Set<string>();
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let resolvers = this.resolver.resolvers as unknown as Set<ResolverModule>;
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@ -51,44 +85,34 @@ export default class Handshake extends AbstractResolverModule {
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return blacklist;
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}
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async resolve(
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domain: string,
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async processRecords(
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hnsRecords: HnsRecord[],
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options: ResolverOptions,
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domain: string,
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bypassCache: boolean,
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): Promise<DNSResult> {
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options.options = options.options || {};
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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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const chainRecords = await this.query(tld);
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if (chainRecords.error) {
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return resolverError(chainRecords.error);
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}
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if (!chainRecords.result?.records.length) {
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return resolverEmptyResponse();
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}
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): Promise<DNSRecord[]> {
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let records: DNSRecord[] = [];
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const hnsRecords = chainRecords.result?.records;
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const nsServer = this.findNameserver(hnsRecords, options);
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const nsRecords = this.findRecordsByType(hnsRecords, "NS");
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const contentRecords = this.findRecordsByType(hnsRecords, "TXT");
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if (!nsServer) {
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const ns = this.findRecordsByType(hnsRecords, "NS");
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// Scenario: Content and NS Records Found (HIP-5)
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if (
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nsRecords &&
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contentRecords &&
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options.type === DNS_RECORD_TYPE.CONTENT
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) {
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return this.handleContentRecords(contentRecords, options);
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}
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if (ns && this.isNSHip5(ns[0], options)) {
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// Scenario: HIP-5 Compliance
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if (nsRecords) {
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const hip5Record = nsRecords.find((record) =>
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this.isNSHip5(record, options),
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);
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if (hip5Record) {
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let result = await this.resolver.resolve(
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ns[0].ns,
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hip5Record.ns,
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{
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...options,
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options: {
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@ -99,40 +123,92 @@ export default class Handshake extends AbstractResolverModule {
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);
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if (result.records.length) {
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records.push.apply(records, result.records);
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}
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} else {
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const content = this.findRecordsByType(hnsRecords, "TXT");
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if (content && [DNS_RECORD_TYPE.CONTENT].includes(options.type)) {
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content.forEach((record) =>
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records.push({
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type: DNS_RECORD_TYPE.CONTENT,
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value: record.txt.slice().pop() as string,
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}),
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);
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records.push(...result.records);
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}
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return records;
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}
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} else {
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for (const type of [DNS_RECORD_TYPE.A, DNS_RECORD_TYPE.CNAME]) {
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if (type === options.type) {
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const ret = await this.dnsQuery(domain, type);
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if (ret.length) {
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records.push({
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type,
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value: ret.slice().shift().data.address,
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});
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}
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}
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// Scenario: Delegated Lookup (via NS)
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if (nsRecords && this.isNSHip5(nsRecords[0], options)) {
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return await this.handleDelegatedLookup(
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nsRecords,
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options,
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domain,
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bypassCache,
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);
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}
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// Scenario: Content Records
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if (contentRecords) {
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return this.handleContentRecords(contentRecords, options);
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}
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// Scenario: Direct DNS Query
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return await this.handleWithNameserver(domain, options);
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}
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// Handle Content Records
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handleContentRecords(
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contentRecords: HnsRecord[],
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options: ResolverOptions,
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): DNSRecord[] {
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let records: DNSRecord[] = [];
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if (options.type === DNS_RECORD_TYPE.CONTENT) {
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contentRecords.forEach((record) =>
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records.push({
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type: DNS_RECORD_TYPE.CONTENT,
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value: record.txt?.slice().pop() as string,
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}),
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);
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}
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return records;
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}
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// Handle HIP-5 NS Delegation
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async handleDelegatedLookup(
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nsRecords: HnsRecord[],
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options: ResolverOptions,
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domain: string,
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bypassCache: boolean,
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): Promise<DNSRecord[]> {
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let records: DNSRecord[] = [];
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const result = await this.resolver.resolve(
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nsRecords[0].ns as string,
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{ ...options, options: { domain } },
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bypassCache,
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);
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if (result.records.length) {
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records.push(...result.records);
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}
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return records;
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}
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// Check if the resolution should be bypassed
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async shouldBypassResolution(domain: string): Promise<boolean> {
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const tld = getTld(domain);
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const blacklist = await this.buildBlacklist();
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return blacklist.has(tld) || isIp(domain);
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}
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// Handle the case where a nameserver is found
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async handleWithNameserver(
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domain: string,
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options: ResolverOptions,
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): Promise<DNSRecord[]> {
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let records: DNSRecord[] = [];
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for (const type of [DNS_RECORD_TYPE.A, DNS_RECORD_TYPE.CNAME]) {
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if (type === options.type) {
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const ret = await this.dnsQuery(domain, type);
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if (ret.length) {
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records.push({ type, value: ret.slice().shift().data.address });
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}
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}
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}
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records = ensureUniqueRecords(records);
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if (0 < records.length) {
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return resolveSuccess(records);
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}
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return resolverEmptyResponse();
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return records;
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}
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private async query(tld: string): Promise<HandshakeResponse> {
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@ -146,37 +222,6 @@ export default class Handshake extends AbstractResolverModule {
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async ready() {
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return ((await client.status()) as any)?.ready;
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}
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private findNameserver(
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records: HnsRecord[],
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options: ResolverOptions,
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): HnsRecord | false {
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const synth4 = this.findRecordsByType(records, "SYNTH4");
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const synth6 = this.findRecordsByType(records, "SYNTH6");
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const synth = synth4 || synth6;
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const glue4 = this.findRecordsByType(records, "GLUE4");
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const glue6 = this.findRecordsByType(records, "GLUE6");
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const glue = glue4 || glue6;
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const ns = this.findRecordsByType(records, "NS");
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if (synth) {
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return synth[0];
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}
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if (glue) {
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return glue[0];
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}
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if (ns) {
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if (!this.isNSHip5(ns[0], options)) {
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return ns[0];
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}
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}
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return false;
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}
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private findRecordsByType(
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records: HnsRecord[],
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type: "NS" | "SYNTH4" | "SYNTH6" | "GLUE4" | "GLUE6" | "TXT",
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