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calcom/packages/features/auth/lib/sendVerificationRequest.ts

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+import { readFileSync } from "fs";
+import Handlebars from "handlebars";
+import type { SendVerificationRequestParams } from "next-auth/providers/email";
+import type { TransportOptions } from "nodemailer";
+import nodemailer from "nodemailer";
+import path from "path";
+
+import { APP_NAME, WEBAPP_URL } from "@calcom/lib/constants";
+import { serverConfig } from "@calcom/lib/serverConfig";
+
+const transporter = nodemailer.createTransport<TransportOptions>({
+  ...(serverConfig.transport as TransportOptions),
+} as TransportOptions);
+
+const sendVerificationRequest = async ({ identifier, url }: SendVerificationRequestParams) => {
+  const emailsDir = path.resolve(process.cwd(), "..", "..", "packages/emails", "templates");
+  const originalUrl = new URL(url);
+  const webappUrl = new URL(process.env.NEXTAUTH_URL || WEBAPP_URL);
+  if (originalUrl.origin !== webappUrl.origin) {
+    url = url.replace(originalUrl.origin, webappUrl.origin);
+  }
+  const emailFile = readFileSync(path.join(emailsDir, "confirm-email.html"), {
+    encoding: "utf8",
+  });
+  const emailTemplate = Handlebars.compile(emailFile);
+  // async transporter
+  transporter.sendMail({
+    from: `${process.env.EMAIL_FROM}` || APP_NAME,
+    to: identifier,
+    subject: `Your sign-in link for ${APP_NAME}`,
+    html: emailTemplate({
+      base_url: WEBAPP_URL,
+      signin_url: url,
+      email: identifier,
+    }),
+  });
+};
+
+export default sendVerificationRequest;