feat: move DNS checker slackbot from lambda

src/constants/constants.ts

@@ -2,24 +2,24 @@
 
 import { config } from "@config/config"
 
 export enum JobStatus {
   Ready = "READY", // Ready to run jobs
   Running = "RUNNING", // A job is running
   Failed = "FAILED", // A job has failed and recovery is needed
 }
 
 export enum SiteStatus {
   Empty = "EMPTY", // A site record site is being initialized
   Initialized = "INITIALIZED",
   Launched = "LAUNCHED",
 }
 
 export enum RedirectionTypes {
   CNAME = "CNAME",
   A = "A",
 }
 
 export enum CollaboratorRoles {
   Admin = "ADMIN",
   Contributor = "CONTRIBUTOR",
   IsomerAdmin = "ISOMERADMIN",
@@ -30,7 +30,7 @@
   CollaboratorRoles.IsomerAdmin
 >
 
 export enum ReviewRequestStatus {
   Approved = "APPROVED",
   Open = "OPEN",
   Merged = "MERGED",
@@ -79,6 +79,8 @@
 export const ALLOWED_DNS_ERROR_CODES = ["ENOTFOUND", "ENODATA"]
 
 export const DNS_INDIRECTION_DOMAIN = "hostedon.isomer.gov.sg"
+export const DNS_KEYCDN_SUFFIX = "kxcdn.com"
+export const DNS_CNAME_SUFFIXES = ["cloudfront.net", DNS_KEYCDN_SUFFIX]
 export const DNS_INDIRECTION_REPO = "isomer-indirection"
 export const ISOMER_ADMIN_EMAIL = "[email protected]"
 export const ISOMER_SUPPORT_EMAIL = "[email protected]"

src/types/dnsChecker.ts

@@ -0,0 +1,11 @@
+export interface DnsCheckerResponse {
+  // eslint-disable-next-line camelcase
+  response_type: "in_channel"
+  blocks: Array<{
+    type: "section"
+    text: {
+      type: "mrkdwn"
+      text: string
+    }
+  }>
+}

support/routes/v2/isobot/index.ts

@@ -3,6 +3,7 @@ import express, { RequestHandler } from "express"
 import { Whitelist } from "@database/models"
 import logger from "@root/logger/logger"
 import WhitelistService from "@root/services/identity/WhitelistService"
+import type { DnsCheckerResponse } from "@root/types/dnsChecker"
 
 import BotService, { SlackPayload } from "./ops/botService"
 
@@ -40,4 +41,23 @@ const handleWhitelistEmails: RequestHandler<
   }
 }
 
+const handleDnsChecker: RequestHandler<
+  never,
+  DnsCheckerResponse | { message: string },
+  SlackPayload,
+  unknown,
+  never
+> = async (req, res) => {
+  const validatedDomain = botService.getValidatedDomain(req.body)
+  if (!validatedDomain)
+    return res.status(200).send({
+      message: `Sorry, \`${req.body.text}\` is not a valid domain name. Please try again with a valid one instead.`,
+    })
+
+  return botService
+    .dnsChecker(req.body)
+    .map((response) => res.status(200).send(response))
+}
+
+isobotRouter.post("/dns-checker", handleDnsChecker)
 isobotRouter.post("/whitelist-emails", handleWhitelistEmails)