94 lines
2.7 KiB
TypeScript
94 lines
2.7 KiB
TypeScript
// SPDX-License-Identifier: MIT
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/**
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* A DNS response
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*/
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export type QueryResponse = {
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dnsResponse:
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| string[]
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| Deno.CAARecord[]
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| Deno.MXRecord[]
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| Deno.NAPTRRecord[]
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| Deno.SOARecord[]
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| Deno.SRVRecord[]
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| string[][];
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response: string;
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time: number;
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};
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/**
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* Options for which DNS server to query
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*/
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export type ServerOptions = {
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server: string;
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port?: number;
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};
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export function isRecordType(type: string): type is Deno.RecordType {
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return type.toUpperCase() === "A" || type.toUpperCase() === "AAAA" ||
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type.toUpperCase() === "CNAME" || type.toUpperCase() === "MX" ||
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type.toUpperCase() === "NS" || type.toUpperCase() === "PTR" ||
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type.toUpperCase() === "SOA" || type.toUpperCase() === "TXT" ||
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type.toUpperCase() === "NAPTR" || type.toUpperCase() === "SRV" ||
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type.toUpperCase() === "CAA";
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}
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/**
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* Test if the DNS query is an MX record
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* @param {QueryResponse["dnsResponse"]} record - DNS response
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* @returns {boolean} - true if the record is an MX record
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*/
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export function isMX(
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record: QueryResponse["dnsResponse"],
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): record is Deno.MXRecord[] {
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return (record as unknown as Deno.MXRecord[])[0].exchange !== undefined;
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}
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/**
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* Test if the DNS query is a CAA record
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* @param {QueryResponse["dnsResponse"]} record - DNS response
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* @returns {boolean} - true if the record is a CAA record
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*/
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export function isCAA(
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record: QueryResponse["dnsResponse"],
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): record is Deno.CAARecord[] {
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return (record as unknown as Deno.CAARecord[])[0].critical !== undefined;
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}
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/**
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* Test if the DNS query is an NAPTR record
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* @param {QueryResponse["dnsResponse"]} record - DNS response
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* @returns {boolean} - true if the record is an NAPTR record
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*/
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export function isNAPTR(
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record: QueryResponse["dnsResponse"],
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): record is Deno.NAPTRRecord[] {
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return (record as unknown as Deno.NAPTRRecord[])[0].regexp !== undefined;
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}
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/**
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* Test if the DNS query is an SOA record
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* @param {QueryResponse["dnsResponse"]} record - DNS response
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* @returns {boolean} - true if the record is an SOA record
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*/
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export function isSOA(
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record: QueryResponse["dnsResponse"],
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): record is Deno.SOARecord[] {
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return (record as unknown as Deno.SOARecord[])[0].rname !== undefined;
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}
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/**
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* Test if the DNS query is an SRV record
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* @param {QueryResponse["dnsResponse"]} record - DNS response
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* @returns {boolean} - true if the record is an SRV record
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*/
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export function isSRV(
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record: QueryResponse["dnsResponse"],
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): record is Deno.SRVRecord[] {
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return (record as unknown as Deno.SRVRecord[])[0].port !== undefined;
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}
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export function isTXT(
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record: QueryResponse["dnsResponse"],
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): record is string[][] {
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return Array.isArray(record as unknown as Array<string>);
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}
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