Adding crud operations for invoices, client and server side validation, and NextAuth for login.

app/dashboard/invoices/[id]/edit/not-found.tsx

@@ -0,0 +1,18 @@
+import Link from "next/link";
+import { FaceFrownIcon } from "@heroicons/react/24/outline";
+
+export default function NotFound() {
+	return (
+		<main className="flex h-full flex-col items-center justify-center gap-2">
+			<FaceFrownIcon className="w-10 text-gray-400" />
+			<h2 className="text-xl font-semibold">404 Not Found</h2>
+			<p>Could not find the requested invoice.</p>
+			<Link
+				href="/dashboard/invoices"
+				className="mt-4 rounded-md bg-blue-500 px-4 py-2 text-sm text-white transition-colors hover:bg-blue-400"
+			>
+				Go Back
+			</Link>
+		</main>
+	);
+}

app/dashboard/invoices/[id]/edit/page.tsx

@@ -0,0 +1,32 @@
+import { notFound } from "next/navigation";
+import Form from "@/app/ui/invoices/edit-form";
+import Breadcrumbs from "@/app/ui/invoices/breadcrumbs";
+import { fetchCustomers, fetchInvoiceById } from "@/app/lib/data";
+
+export default async function Page({ params }: { params: { id: string } }) {
+	const id = params.id;
+	const [invoice, customers] = await Promise.all([
+		fetchInvoiceById(id),
+		fetchCustomers(),
+	]);
+
+	if (!invoice) {
+		notFound();
+	}
+
+	return (
+		<main>
+			<Breadcrumbs
+				breadcrumbs={[
+					{ label: "Invoices", href: "/dashboard/invoices" },
+					{
+						label: "Edit Invoice",
+						href: `/dashboard/invoices/${id}/edit`,
+						active: true,
+					},
+				]}
+			/>
+			<Form invoice={invoice} customers={customers} />
+		</main>
+	);
+}

app/dashboard/invoices/create/page.tsx

@@ -0,0 +1,23 @@
+import Form from "@/app/ui/invoices/create-form";
+import Breadcrumbs from "@/app/ui/invoices/breadcrumbs";
+import { fetchCustomers } from "@/app/lib/data";
+
+export default async function Page() {
+	const customers = await fetchCustomers();
+
+	return (
+		<main>
+			<Breadcrumbs
+				breadcrumbs={[
+					{ label: "Invoices", href: "/dashboard/invoices" },
+					{
+						label: "Create Invoice",
+						href: "/dashboard/invoices/create",
+						active: true,
+					},
+				]}
+			/>
+			<Form customers={customers} />
+		</main>
+	);
+}

app/dashboard/invoices/error.tsx

@@ -0,0 +1,31 @@
+'use client';
+
+import { useEffect } from 'react';
+
+export default function Error({
+	error,
+	reset,
+}: {
+	error: Error & { digest?: string };
+	reset: () => void;
+}) {
+	useEffect(() => {
+		// Optionally log the error to an error reporting service
+		console.error(error);
+	}, [error]);
+
+	return (
+		<main className="flex h-full flex-col items-center justify-center">
+			<h2 className="text-center">Something went wrong!</h2>
+			<button
+				className="mt-4 rounded-md bg-blue-500 px-4 py-2 text-sm text-white transition-colors hover:bg-blue-400"
+				onClick={
+					// Attempt to recover by trying to re-render the invoices route
+					() => reset()
+				}
+			>
+				Try again
+			</button>
+		</main>
+	);
+}

app/dashboard/invoices/page.tsx

@@ -5,6 +5,7 @@ import Table from "@/app/ui/invoices/table";
 import { CreateInvoice } from "@/app/ui/invoices/buttons";
 import { lusitana } from "@/app/ui/fonts";
 import { InvoicesTableSkeleton } from "@/app/ui/skeletons";
+import { fetchInvoicesPages } from "@/app/lib/data";
 
 export default async function Page({
 	searchParams,
@@ -16,6 +17,7 @@ export default async function Page({
 }) {
 	const query = searchParams?.query || "";
 	const currentPage = Number(searchParams?.page) || 1;
+	const totalPages = await fetchInvoicesPages(query);
 
 	return (
 		<div className="w-full">
@@ -30,7 +32,7 @@ export default async function Page({
 				<Table query={query} currentPage={currentPage} />
 			</Suspense>
 			<div className="mt-5 flex w-full justify-center">
-				{/* <Pagination totalPages={totalPages} /> */}
+				<Pagination totalPages={totalPages} />
 			</div>
 		</div>
 	);

app/lib/actions.ts

@@ -0,0 +1,135 @@
+'use server';
+
+import { redirect } from 'next/navigation';
+import { revalidatePath } from 'next/cache';
+import { sql } from '@vercel/postgres';
+import { signIn } from '@/auth';
+import { z } from 'zod';
+
+const FormSchema = z.object({
+	id: z.string(),
+	customerId: z.string({
+		invalid_type_error: "Please select a customer.",
+	}),
+	amount: z.coerce
+		.number()
+		.gt(0, { message: "Please enter an amoint greater than $0." }),
+	status: z.enum(["pending", "paid"], {
+		invalid_type_error: "Please select an invoice status.",
+	}),
+	date: z.string(),
+});
+
+const CreateInvoice = FormSchema.omit({ id: true, date: true });
+const UpdateInvoice = FormSchema.omit({ date: true });
+const DeleteInvoice = FormSchema.pick({ id: true });
+
+export type State = {
+	errors?: {
+		customerId?: string[];
+		amount?: string[];
+		status?: string[];
+	};
+	message?: string | null;
+}
+
+export async function createInvoice(prevState: State, formData: FormData) {
+	// Validate form using Zod
+	const validatedFields = CreateInvoice.safeParse({
+		customerId: formData.get("customerId"),
+		amount: formData.get("amount"),
+		status: formData.get("status"),
+	});
+
+	// If form validation fails, return errors early. Otherwise, continue.
+	if (!validatedFields.success) {
+		return {
+			errors: validatedFields.error.flatten().fieldErrors,
+			message: "Missing Fields. Failed to Create Invoice.",
+		};
+	}
+
+	// Prepare data for insertion into the database
+	const { customerId, amount, status } = validatedFields.data;
+	const amountInCents = amount * 100;
+	const date = new Date().toISOString().split("T")[0];
+
+	// Insert data into the database
+	try {
+		await sql`
+      INSERT INTO invoices (customer_id, amount, status, date)
+      VALUES (${customerId}, ${amountInCents}, ${status}, ${date})
+    `;
+	} catch (error) {
+		// If a database error occurs, return a more specific error.
+		return {
+			message: "Database Error: Failed to Create Invoice.",
+		};
+	}
+
+	// Revalidate the cache for the invoices page and redirect the user.
+	revalidatePath("/dashboard/invoices");
+	redirect("/dashboard/invoices");
+}
+
+export async function updateInvoice(prevState: State, formData: FormData) {
+	const validatedFields = UpdateInvoice.safeParse({
+		id: formData.get("id"),
+		customerId: formData.get("customerId"),
+		amount: formData.get("amount"),
+		status: formData.get("status"),
+	});
+
+	if (!validatedFields.success) {
+		return {
+			errors: validatedFields.error.flatten().fieldErrors,
+			message: "Missing Fields. Failed to Update Invoice.",
+		};
+	}
+
+	const { id, customerId, amount, status } = validatedFields.data;
+	const amountInCents = amount * 100;
+
+	try {
+		await sql`
+      UPDATE invoices
+      SET customer_id = ${customerId}, amount = ${amountInCents}, status = ${status}
+      WHERE id = ${id}
+    `;
+	} catch (error) {
+		return { message: "Database Error: Failed to Update Invoice." };
+	}
+
+	revalidatePath("/dashboard/invoices");
+	redirect("/dashboard/invoices");
+}
+
+export async function deleteInvoice(formData: FormData) {
+	 const { id } = DeleteInvoice.parse({
+			id: formData.get("id"),
+	 });
+
+	try {
+		await sql`DELETE FROM invoices WHERE id = ${id}`;
+	} catch (error) {
+		return {
+			message: 'Database Error: Failed to Delete Invoice.'
+		}
+	}
+
+	revalidatePath('/dashboard/invoices');
+}
+
+export async function authenticate(
+	prevState: string | undefined,
+	formData: FormData
+) {
+	try {
+		await signIn("credentials", Object.fromEntries(formData));
+	} catch (error) {
+		if ((error as Error).message.includes("CredentialsSignin")) {
+			return "CredentialSignin";
+		}
+		throw error;
+	}
+}

app/login/page.tsx

@@ -0,0 +1,17 @@
+import AcmeLogo from "@/app/ui/acme-logo";
+import LoginForm from "@/app/ui/login-form";
+
+export default function LoginPage() {
+	return (
+		<main className="flex items-center justify-center md:h-screen">
+			<div className="relative mx-auto flex w-full max-w-[400px] flex-col space-y-2.5 p-4 md:-mt-32">
+				<div className="flex h-20 w-full items-end rounded-lg bg-blue-500 p-3 md:h-36">
+					<div className="w-32 text-white md:w-36">
+						<AcmeLogo />
+					</div>
+				</div>
+				<LoginForm />
+			</div>
+		</main>
+	);
+}

app/ui/dashboard/sidenav.tsx

@@ -1,7 +1,8 @@
-import Link from 'next/link';
-import NavLinks from '@/app/ui/dashboard/nav-links';
-import AcmeLogo from '@/app/ui/acme-logo';
-import { PowerIcon } from '@heroicons/react/24/outline';
+import Link from "next/link";
+import NavLinks from "@/app/ui/dashboard/nav-links";
+import AcmeLogo from "@/app/ui/acme-logo";
+import { PowerIcon } from "@heroicons/react/24/outline";
+import { signOut } from "@/auth";
 
 export default function SideNav() {
 	return (
@@ -17,7 +18,12 @@ export default function SideNav() {
 			<div className="flex grow flex-row justify-between space-x-2 md:flex-col md:space-x-0 md:space-y-2">
 				<NavLinks />
 				<div className="hidden h-auto w-full grow rounded-md bg-gray-50 md:block"></div>
-        <form>
+				<form
+					action={async () => {
+						"use server";
+						await signOut();
+					}}
+				>
 					<button className="flex h-[48px] grow items-center justify-center gap-2 rounded-md bg-gray-50 p-3 text-sm font-medium hover:bg-sky-100 hover:text-blue-600 md:flex-none md:justify-start md:p-2 md:px-3">
 						<PowerIcon className="w-6" />
 						<div className="hidden md:block">Sign Out</div>

app/ui/invoices/buttons.tsx

@@ -1,5 +1,6 @@
 import { PencilIcon, PlusIcon, TrashIcon } from '@heroicons/react/24/outline';
 import Link from 'next/link';
+import { deleteInvoice } from '@/app/lib/actions';
 
 export function CreateInvoice() {
   return (
@@ -16,7 +17,7 @@ export function CreateInvoice() {
 export function UpdateInvoice({ id }: { id: string }) {
   return (
     <Link
-      href="/dashboard/invoices"
+      href={`/dashboard/invoices/${id}/edit`}
       className="rounded-md border p-2 hover:bg-gray-100"
     >
       <PencilIcon className="w-5" />
@@ -26,11 +27,12 @@ export function UpdateInvoice({ id }: { id: string }) {
 
 export function DeleteInvoice({ id }: { id: string }) {
   return (
-    <>
+    <form action={deleteInvoice}>
+      <input type="hidden" name="id" value={id} />
       <button className="rounded-md border p-2 hover:bg-gray-100">
         <span className="sr-only">Delete</span>
         <TrashIcon className="w-5" />
       </button>
-    </>
+    </form>
   );
 }

app/ui/invoices/create-form.tsx

@@ -1,6 +1,6 @@
 'use client';
 
-import { CustomerField } from '@/app/lib/definitions';
+import { useFormState } from 'react-dom';
 import Link from 'next/link';
 import {
   CheckIcon,
@@ -9,10 +9,19 @@ import {
   UserCircleIcon,
 } from '@heroicons/react/24/outline';
 import { Button } from '../button';
+import { CustomerField } from '@/app/lib/definitions';
+import { createInvoice } from '@/app/lib/actions';
 
 export default function Form({ customers }: { customers: CustomerField[] }) {
+  const initialState = {
+    message: null,
+    errors: {}
+  };
+  const [state, dispatch] = useFormState(createInvoice, initialState);
+  console.log('state', state);
+
   return (
-    <form>
+		<form action={dispatch}>
 			<div className="rounded-md bg-gray-50 p-4 md:p-6">
 				{/* Customer Name */}
 				<div className="mb-4">
@@ -25,6 +34,7 @@ export default function Form({ customers }: { customers: CustomerField[] }) {
 							name="customerId"
 							className="peer block w-full rounded-md border border-gray-200 py-2 pl-10 text-sm outline-2 placeholder:text-gray-500"
 							defaultValue=""
+							aria-describedby="customer-error"
 						>
 							<option value="" disabled>
 								Select a customer
@@ -37,6 +47,17 @@ export default function Form({ customers }: { customers: CustomerField[] }) {
 						</select>
 						<UserCircleIcon className="pointer-events-none absolute left-3 top-1/2 h-[18px] w-[18px] -translate-y-1/2 text-gray-500" />
 					</div>
+					{state.errors?.customerId ? (
+						<div
+							id="customer-error"
+							aria-live="polite"
+							className="mt-2 text-sm text-red-500"
+						>
+							{state.errors.customerId.map((error: string) => (
+								<p key={error}>{error}</p>
+							))}
+						</div>
+					) : null}
 				</div>
 
 				{/* Invoice Amount */}
@@ -53,11 +74,22 @@ export default function Form({ customers }: { customers: CustomerField[] }) {
 								step="0.01"
 								placeholder="Enter USD amount"
 								className="peer block w-full rounded-md border border-gray-200 py-2 pl-10 text-sm outline-2 placeholder:text-gray-500"
+								aria-describedby="amount-error"
 							/>
 							<CurrencyDollarIcon className="pointer-events-none absolute left-3 top-1/2 h-[18px] w-[18px] -translate-y-1/2 text-gray-500 peer-focus:text-gray-900" />
 						</div>
 					</div>
-          s
+					{state.errors?.amount ? (
+						<div
+							id="amount-error"
+							aria-live="polite"
+							className="mt-2 text-sm text-red-500"
+						>
+							{state.errors.amount.map((error: string) => (
+								<p key={error}>{error}</p>
+							))}
+						</div>
+					) : null}
 				</div>
 
 				{/* Invoice Status */}
@@ -74,6 +106,7 @@ export default function Form({ customers }: { customers: CustomerField[] }) {
 									type="radio"
 									value="pending"
 									className="h-4 w-4 border-gray-300 bg-gray-100 text-gray-600 focus:ring-2 focus:ring-gray-500 dark:border-gray-600 dark:bg-gray-700 dark:ring-offset-gray-800 dark:focus:ring-gray-600"
+									aria-describedby="status-error"
 								/>
 								<label
 									htmlFor="pending"
@@ -89,6 +122,7 @@ export default function Form({ customers }: { customers: CustomerField[] }) {
 									type="radio"
 									value="paid"
 									className="h-4 w-4 border-gray-300 bg-gray-100 text-gray-600 focus:ring-2 focus:ring-gray-500 dark:border-gray-600 dark:bg-gray-700 dark:ring-offset-gray-800 dark:focus:ring-gray-600"
+									aria-describedby="status-error"
 								/>
 								<label
 									htmlFor="paid"
@@ -99,6 +133,26 @@ export default function Form({ customers }: { customers: CustomerField[] }) {
 							</div>
 						</div>
 					</div>
+					{state.errors?.status ? (
+						<div
+							id="status-error"
+							aria-live="polite"
+							className="mt-2 text-sm text-red-500"
+						>
+							{state.errors.status.map((error: string) => (
+								<p key={error}>{error}</p>
+							))}
+						</div>
+					) : null}
+					{state.message ? (
+						<div
+							id="edit-error"
+							aria-live="polite"
+							className="mt-2 text-sm text-red-500"
+						>
+              <p>{state.message}</p>
+						</div>
+					) : null}
 				</div>
 			</div>
 			<div className="mt-6 flex justify-end gap-4">

app/ui/invoices/edit-form.tsx

@@ -1,5 +1,6 @@
 'use client';
 
+import { useFormState } from 'react-dom';
 import { CustomerField, InvoiceForm } from '@/app/lib/definitions';
 import {
   CheckIcon,
@@ -9,6 +10,7 @@ import {
 } from '@heroicons/react/24/outline';
 import Link from 'next/link';
 import { Button } from '@/app/ui/button';
+import { updateInvoice } from '@/app/lib/actions';
 
 export default function EditInvoiceForm({
   invoice,
@@ -17,8 +19,12 @@ export default function EditInvoiceForm({
   invoice: InvoiceForm;
   customers: CustomerField[];
 }) {
+  const initialState = { message: null, errors: {} };
+	const [state, dispatch] = useFormState(updateInvoice, initialState);
+
   return (
-    <form>
+		<form action={dispatch}>
+			<input type="hidden" name="id" value={invoice.id} />
 			<div className="rounded-md bg-gray-50 p-4 md:p-6">
 				{/* Invoice ID */}
 				<input type="hidden" name="id" value={invoice.id} />
@@ -33,6 +39,7 @@ export default function EditInvoiceForm({
 							name="customerId"
 							className="peer block w-full rounded-md border border-gray-200 py-2 pl-10 text-sm outline-2 placeholder:text-gray-500"
 							defaultValue={invoice.customer_id}
+							aria-describedby="customer-error"
 						>
 							<option value="" disabled>
 								Select a customer
@@ -45,6 +52,17 @@ export default function EditInvoiceForm({
 						</select>
 						<UserCircleIcon className="pointer-events-none absolute left-3 top-1/2 h-[18px] w-[18px] -translate-y-1/2 text-gray-500" />
 					</div>
+					{state.errors?.customerId ? (
+						<div
+							id="customer-error"
+							aria-live="polite"
+							className="mt-2 text-sm text-red-500"
+						>
+							{state.errors.customerId.map((error: string) => (
+								<p key={error}>{error}</p>
+							))}
+						</div>
+					) : null}
 				</div>
 
 				{/* Invoice Amount */}
@@ -61,14 +79,26 @@ export default function EditInvoiceForm({
 								defaultValue={invoice.amount}
 								placeholder="Enter USD amount"
 								className="peer block w-full rounded-md border border-gray-200 py-2 pl-10 text-sm outline-2 placeholder:text-gray-500"
+								aria-describedby="amount-error"
 							/>
 							<CurrencyDollarIcon className="pointer-events-none absolute left-3 top-1/2 h-[18px] w-[18px] -translate-y-1/2 text-gray-500 peer-focus:text-gray-900" />
 						</div>
 					</div>
+					{state.errors?.amount ? (
+						<div
+							id="amount-error"
+							aria-live="polite"
+							className="mt-2 text-sm text-red-500"
+						>
+							{state.errors.amount.map((error: string) => (
+								<p key={error}>{error}</p>
+							))}
+						</div>
+					) : null}
 				</div>
 
 				{/* Invoice Status */}
-        <div>
+				<fieldset>
 					<label htmlFor="status" className="mb-2 block text-sm font-medium">
 						Set the invoice status
 					</label>
@@ -80,7 +110,7 @@ export default function EditInvoiceForm({
 									name="status"
 									type="radio"
 									value="pending"
-                  defaultChecked={invoice.status === 'pending'}
+									defaultChecked={invoice.status === "pending"}
 									className="h-4 w-4 border-gray-300 bg-gray-100 text-gray-600 focus:ring-2 focus:ring-gray-500 dark:border-gray-600 dark:bg-gray-700 dark:ring-offset-gray-800 dark:focus:ring-gray-600"
 								/>
 								<label
@@ -96,7 +126,7 @@ export default function EditInvoiceForm({
 									name="status"
 									type="radio"
 									value="paid"
-                  defaultChecked={invoice.status === 'paid'}
+									defaultChecked={invoice.status === "paid"}
 									className="h-4 w-4 border-gray-300 bg-gray-100 text-gray-600 focus:ring-2 focus:ring-gray-500 dark:border-gray-600 dark:bg-gray-700 dark:ring-offset-gray-800 dark:focus:ring-gray-600"
 								/>
 								<label
@@ -108,7 +138,24 @@ export default function EditInvoiceForm({
 							</div>
 						</div>
 					</div>
+					{state.errors?.status ? (
+						<div
+							aria-describedby="status-error"
+							aria-live="polite"
+							className="mt-2 text-sm text-red-500"
+						>
+							{state.errors.status.map((error: string) => (
+								<p key={error}>{error}</p>
+							))}
 						</div>
+					) : null}
+				</fieldset>
+
+				{state.message ? (
+					<div aria-live="polite" className="my-2 text-sm text-red-500">
+						<p>{state.message}</p>
+					</div>
+				) : null}
 			</div>
 			<div className="mt-6 flex justify-end gap-4">
 				<Link

app/ui/invoices/pagination.tsx

@@ -1,20 +1,30 @@
 'use client';
 
+import { usePathname, useSearchParams } from 'next/navigation';
+import Link from 'next/link';
 import { ArrowLeftIcon, ArrowRightIcon } from '@heroicons/react/24/outline';
 import clsx from 'clsx';
-import Link from 'next/link';
 import { generatePagination } from '@/app/lib/utils';
 
 export default function Pagination({ totalPages }: { totalPages: number }) {
   // NOTE: comment in this code when you get to this point in the course
+  const pathname = usePathname();
+  const searchParams = useSearchParams();
+  const currentPage = Number(searchParams.get('page')) || 1;
 
-  // const allPages = generatePagination(currentPage, totalPages);
+  const createPageURL = (pageNumber: number | string) => {
+    const params = new URLSearchParams(searchParams);
+    params.set("page", pageNumber.toString());
+    return `${pathname}?${params.toString()}`;
+  }
+
+  const allPages = generatePagination(currentPage, totalPages);
 
   return (
     <>
       {/* NOTE: comment in this code when you get to this point in the course */}
 
-      {/* <div className="inline-flex">
+      <div className="inline-flex">
         <PaginationArrow
           direction="left"
           href={createPageURL(currentPage - 1)}
@@ -47,7 +57,7 @@ export default function Pagination({ totalPages }: { totalPages: number }) {
           href={createPageURL(currentPage + 1)}
           isDisabled={currentPage >= totalPages}
         />
-      </div> */}
+      </div>
     </>
   );
 }

app/ui/login-form.tsx

@@ -1,15 +1,22 @@
-import { lusitana } from '@/app/ui/fonts';
+"use client";
+
+import { authenticate } from "@/app/lib/actions";
+import { lusitana } from "@/app/ui/fonts";
 import {
 	AtSymbolIcon,
 	KeyIcon,
 	ExclamationCircleIcon,
-} from '@heroicons/react/24/outline';
-import { ArrowRightIcon } from '@heroicons/react/20/solid';
-import { Button } from './button';
+} from "@heroicons/react/24/outline";
+import { ArrowRightIcon } from "@heroicons/react/20/solid";
+import { Button } from "./button";
+import { useFormState, useFormStatus } from "react-dom";
 
 export default function LoginForm() {
+	const [code, action] = useFormState(authenticate, undefined);
+	const { pending } = useFormStatus();
+
 	return (
-    <form className="space-y-3">
+		<form action={action} className="space-y-3">
 			<div className="flex-1 rounded-lg bg-gray-50 px-6 pb-4 pt-8">
 				<h1 className={`${lusitana.className} mb-3 text-2xl`}>
 					Please log in to continue.
@@ -57,7 +64,14 @@ export default function LoginForm() {
 				</div>
 				<LoginButton />
 				<div className="flex h-8 items-end space-x-1">
-          {/* Add form errors here */}
+					{code === "CredentialsSignin" && (
+						<>
+							<ExclamationCircleIcon className="h-5 w-5 text-red-500" />
+							<p aria-live="polite" className="text-sm text-red-500">
+								Invalid credentials
+							</p>
+						</>
+					)}
 				</div>
 			</div>
 		</form>
@@ -65,8 +79,10 @@ export default function LoginForm() {
 }
 
 function LoginButton() {
+	const { pending } = useFormStatus();
+
 	return (
-    <Button className="mt-4 w-full">
+		<Button className="mt-4 w-full" aria-disabled={pending}>
 			Log in <ArrowRightIcon className="ml-auto h-5 w-5 text-gray-50" />
 		</Button>
 	);

app/ui/search.tsx

@@ -10,8 +10,8 @@ export default function Search({ placeholder }: { placeholder: string }) {
   const { replace } = useRouter();
 
   const handleSearch = useDebouncedCallback((term: string) => {
-    console.log(`Searching... ${term}`);
     const params = new URLSearchParams(searchParams);
+    params.set('page', '1');
     if (term) {
       params.set('query', term);
     } else {

auth.config.ts

@@ -0,0 +1,24 @@
+import type { NextAuthConfig } from "next-auth";
+
+export const authConfig = {
+	pages: {
+		signIn: "/login",
+	},
+	providers: [
+		// added later in auth.ts since it requires bcrypt which is only compatible with Node.js
+		// while this file is also used in non-Node.js environments
+	],
+	callbacks: {
+		authorized({ auth, request: { nextUrl } }) {
+			const isLoggedIn = !!auth?.user;
+			const isOnDashboard = nextUrl.pathname.startsWith("/dashboard");
+			if (isOnDashboard) {
+				if (isLoggedIn) return true;
+				return false; // Redirect unathenticated users to login page
+			} else if (isLoggedIn) {
+				return Response.redirect(new URL("/dashboard", nextUrl));
+			}
+			return true;
+		},
+	},
+} satisfies NextAuthConfig;

auth.ts

@@ -0,0 +1,45 @@
+import NextAuth from "next-auth";
+import Credentials from "next-auth/providers/credentials";
+import bcrypt from "bcrypt";
+import { sql } from "@vercel/postgres";
+import { z } from "zod";
+import type { User } from "@/app/lib/definitions";
+import { authConfig } from "./auth.config";
+
+async function getUser(email: string): Promise<User | undefined> {
+	try {
+		const user = await sql<User>`SELECT * from USERS where email=${email}`;
+		return user.rows[0];
+	} catch (error) {
+		console.error("Failed to fetch user:", error);
+		throw new Error("Failed to fetch user.");
+	}
+}
+
+export const { auth, signIn, signOut } = NextAuth({
+	...authConfig,
+	providers: [
+		Credentials({
+			async authorize(credentials) {
+				const parsedCredentials = z
+					.object({ email: z.string().email(), password: z.string().min(6) })
+					.safeParse(credentials);
+
+				if (parsedCredentials.success) {
+					console.log('Valid credentials');
+					const { email, password } = parsedCredentials.data;
+
+					const user = await getUser(email);
+					if (!user) return null;
+
+					const passwordsMatch = await bcrypt.compare(password, user.password);
+					console.log('Passwords match', passwordsMatch);
+					if (passwordsMatch) return user;
+				}
+
+				console.log("Invalid credentials");
+				return null;
+			},
+		}),
+	],
+});

middleware.ts

@@ -0,0 +1,9 @@
+import NextAuth from "next-auth";
+import { authConfig } from "./auth.config";
+
+export default NextAuth(authConfig).auth;
+
+export const config = {
+	// https://nextjs.org/docs/app/building-your-application/routing/middleware#matcher
+	matcher: ["/((?!api|_next/static|_next/image|.png).*)"],
+};

package.json

@@ -3,8 +3,9 @@
 	"scripts": {
 		"build": "next build",
 		"dev": "next dev",
+		"seed": "node -r dotenv/config ./scripts/seed.js",
 		"start": "next start",
-		"seed": "node -r dotenv/config ./scripts/seed.js"
+		"lint": "next lint"
 	},
 	"dependencies": {
 		"@heroicons/react": "^2.0.18",
@@ -15,6 +16,7 @@
 		"bcrypt": "^5.1.1",
 		"clsx": "^2.0.0",
 		"next": "^14.0.0",
+		"next-auth": "5.0.0-beta.3",
 		"postcss": "8.4.31",
 		"react": "18.2.0",
 		"react-dom": "18.2.0",
@@ -28,6 +30,8 @@
 		"@types/react": "18.2.21",
 		"@types/react-dom": "18.2.14",
 		"dotenv": "^16.3.1",
+		"eslint": "8.52.0",
+		"eslint-config-next": "14.0.1",
 		"prettier": "^3.0.3"
 	},
 	"engines": {