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import nodemailer from "nodemailer";
import { logger } from "../lib/pino";
let transporter: nodemailer.Transporter | null = null;
/**
* Gets or creates the nodemailer transporter instance.
* Configuration is loaded from SMTP environment variables.
*/
export function getTransporter(): nodemailer.Transporter {
if (!transporter) {
try {
if (!process.env.SMTP_HOST) {
logger.error("SMTP_HOST environment variable not set");
throw new Error("SMTP_HOST is required");
}
if (!process.env.SMTP_PORT) {
logger.error("SMTP_PORT environment variable not set");
throw new Error("SMTP_PORT is required");
}
if (!process.env.SMTP_USER) {
logger.error("SMTP_USER environment variable not set");
throw new Error("SMTP_USER is required");
}
if (!process.env.SMTP_PASS) {
logger.error("SMTP_PASS environment variable not set");
throw new Error("SMTP_PASS is required");
}
const port = Number(process.env.SMTP_PORT);
if (isNaN(port) || port <= 0 || port > 65535) {
logger.error(
{ port: process.env.SMTP_PORT },
"Invalid SMTP_PORT value",
);
throw new Error("SMTP_PORT must be a valid port number");
}
transporter = nodemailer.createTransport({
host: process.env.SMTP_HOST,
port,
secure: process.env.SMTP_SECURE == "1",
auth: {
user: process.env.SMTP_USER,
pass: process.env.SMTP_PASS,
},
});
logger.info(
{
host: process.env.SMTP_HOST,
port,
secure: process.env.SMTP_SECURE == "1",
},
"Email transporter created successfully",
);
} catch (error) {
logger.error({ error }, "Failed to create email transporter");
throw error;
}
}
return transporter;
}
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