shellphone.app/app/auth/mutations/forgot-password.ts

import { resolver, generateToken, hash256 } from "blitz";

import db from "../../../db";
import { forgotPasswordMailer } from "../../../mailers/forgot-password-mailer";
import { ForgotPassword } from "../validations";

const RESET_PASSWORD_TOKEN_EXPIRATION_IN_HOURS = 4;

export default resolver.pipe(resolver.zod(ForgotPassword), async ({ email }) => {
	// 1. Get the user
	const user = await db.user.findFirst({ where: { email: email.toLowerCase() } });

	// 2. Generate the token and expiration date.
	const token = generateToken();
	const hashedToken = hash256(token);
	const expiresAt = new Date();
	expiresAt.setHours(expiresAt.getHours() + RESET_PASSWORD_TOKEN_EXPIRATION_IN_HOURS);

	// 3. If user with this email was found
	if (user) {
		// 4. Delete any existing password reset tokens
		await db.token.deleteMany({ where: { type: "RESET_PASSWORD", userId: user.id } });
		// 5. Save this new token in the database.
		await db.token.create({
			data: {
				user: { connect: { id: user.id } },
				type: "RESET_PASSWORD",
				expiresAt,
				hashedToken,
				sentTo: user.email,
			},
		});
		// 6. Send the email
		await forgotPasswordMailer({ to: user.email, token }).send();
	} else {
		// 7. If no user found wait the same time so attackers can't tell the difference
		await new Promise((resolve) => setTimeout(resolve, 750));
	}

	// 8. Return the same result whether a password reset email was sent or not
	return;
});