cache nodemailer transporters

lib/Auth/sendEmail.ts

@@ -14,13 +14,17 @@ const transporterCache: Map<string, Transporter> = new Map();
  * https://www.nodemailer.com/transports/ses/
  */
 export const sendEmail = (smptConfig: SMTPConfig, email: Email) => {
+  const transporter = getOrSetTransporter(smptConfig);
+  return send(transporter, email);
+}
+
+export const getOrSetTransporter = (smptConfig: SMTPConfig) => {
   const configStr = JSON.stringify(smptConfig);
   const transporter = transporterCache.get(configStr) ?? getTransporter(smptConfig);
   if(!transporterCache.has(configStr)){
     transporterCache.set(configStr, transporter);
   }
-
-  return send(transporter, email);
+  return transporter;
 }
 
 const getTransporter = (smptConfig: SMTPConfig) => {

lib/Auth/setEmailProvider.ts

@@ -1,7 +1,7 @@
 import e from "express";
 import { AUTH_ROUTES_AND_PARAMS, AuthHandler, HTTPCODES } from "./AuthHandler";
 import { Email, SMTPConfig } from "./AuthTypes";
-import { sendEmail } from "./sendEmail";
+import { getOrSetTransporter, sendEmail } from "./sendEmail";
 import { promises } from "node:dns";
 
 export async function setEmailProvider(this: AuthHandler, app: e.Express) {
@@ -12,6 +12,14 @@ export async function setEmailProvider(this: AuthHandler, app: e.Express) {
     await checkDmarc(websiteUrl);
   }
 
+  if(email.signupType === "withPassword"){
+    if(email.emailConfirmation){
+      tryGetTransporter(email.emailConfirmation.smtp);
+    }
+  } else {
+    tryGetTransporter(email.emailMagicLink.smtp);
+  }
+
   app.post(AUTH_ROUTES_AND_PARAMS.emailSignup, async (req, res) => {
     const { username, password } = req.body;
     let validationError = "";
@@ -82,4 +90,12 @@ const checkDmarc = async (websiteUrl: string) => {
   } else {
     console.log("DMARC set to reject")
   }
+}
+
+const tryGetTransporter = (smtp: SMTPConfig) => {
+  try {
+    getOrSetTransporter(smtp);
+  } catch(err) {
+    console.error("Failed to set email transporter", err);
+  }
 }

package.json

@@ -1,6 +1,6 @@
 {
   "name": "prostgles-server",
-  "version": "4.2.161",
+  "version": "4.2.162",
   "description": "",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",