Add basic auth

app/(public)/login/form.tsx

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+'use client';
+
+import { Button } from '@/components/ui/button';
+import { Input } from '@/components/ui/input';
+import { Label } from '@/components/ui/label';
+import { login } from '@/app/auth/01-auth';
+import Link from 'next/link';
+import { useFormState, useFormStatus } from 'react-dom';
+
+export function LoginForm() {
+  const [state, action] = useFormState(login, undefined);
+
+  return (
+    <form action={action}>
+      <div className="space-y-4">
+        <div className="space-y-2">
+          <Label htmlFor="email">Email</Label>
+          <Input
+            id="email"
+            name="email"
+            placeholder="[email protected]"
+            type="email"
+          />
+          {state?.errors?.email && (
+            <p className="text-red-500">{state.errors.email}</p>
+          )}
+        </div>
+        <div className="space-y-2">
+          <div className="flex items-center">
+            <Label htmlFor="password">Password</Label>
+            <Link className="ml-auto inline-block text-sm underline" href="#">
+              Forgot your password?
+            </Link>
+          </div>
+          <Input id="password" type="password" name="password" />
+          {state?.errors?.password && (
+            <p className="text-red-500">{state.errors.password}</p>
+          )}
+        </div>
+        {state?.message && <p className="text-red-500">{state.message}</p>}
+        <LoginButton />
+      </div>
+
+      <div className="mt-4 text-center text-sm">
+        Don&apos;t have an account?{' '}
+        <Link className="underline" href="/signup">
+          Sign up
+        </Link>
+      </div>
+    </form>
+  );
+}
+
+export function LoginButton() {
+  const { pending } = useFormStatus();
+
+  return (
+    <Button aria-disabled={pending} type="submit">
+      {pending ? 'Submitting...' : 'Sign up'}
+    </Button>
+  );
+}

app/(public)/login/page.tsx

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+import { LoginForm } from './form';
+
+export default function Page() {
+  return (
+    <div className="flex w-1/4 items-center px-4 sm:px-6 lg:px-8">
+      <div className="mx-auto w-full space-y-8">
+        <div className="space-y-2 text-center">
+          <h1 className="text-3xl font-bold">Login</h1>
+          <p className="text-sm text-gray-500">
+            Enter your email below to login to your account
+          </p>
+        </div>
+        <LoginForm />
+      </div>
+    </div>
+  );
+}

app/(public)/signup/form.tsx

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+'use client';
+
+import { Label } from '@/components/ui/label';
+import { Input } from '@/components/ui/input';
+import { Button } from '@/components/ui/button';
+import { signup } from '@/app/auth/01-auth';
+import { useFormState, useFormStatus } from 'react-dom';
+
+export function SignupForm() {
+  const [state, action] = useFormState(signup, undefined);
+
+  return (
+    <form action={action}>
+      <div className="space-y-2">
+        <Label htmlFor="name">Name</Label>
+        <Input id="name" name="name" placeholder="John Doe" />
+      </div>
+      {state?.errors?.name && (
+        <p className="text-red-500">{state.errors.name}</p>
+      )}
+      <div className="space-y-2">
+        <Label htmlFor="email">Email</Label>
+        <Input id="email" name="email" placeholder="[email protected]" />
+      </div>
+      {state?.errors?.email && (
+        <p className="text-red-500">{state.errors.email}</p>
+      )}
+      <div className="space-y-2">
+        <Label htmlFor="password">Password</Label>
+        <Input id="password" name="password" type="password" />
+      </div>
+      {state?.errors?.password && (
+        <div>
+          <p>Password must:</p>
+          <ul>
+            {state.errors.password.map((error) => (
+              <li key={error} className="text-red-500">
+                - {error}
+              </li>
+            ))}
+          </ul>
+        </div>
+      )}
+      <SignupButton />
+    </form>
+  );
+}
+
+export function SignupButton() {
+  const { pending } = useFormStatus();
+
+  return (
+    <Button aria-disabled={pending} type="submit">
+      {pending ? 'Submitting...' : 'Sign up'}
+    </Button>
+  );
+}

app/(public)/signup/page.tsx

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+import Link from 'next/link';
+import { SignupForm } from '@/app/(public)/signup/form';
+export default function Page() {
+  return (
+    <div className="flex w-1/4 items-center px-4 sm:px-6 lg:px-8">
+      <div className="mx-auto w-full space-y-8">
+        <div className="space-y-2 text-center">
+          <h1 className="text-3xl font-bold">Create an account</h1>
+          <p className="text-gray-500">Enter your information to get started</p>
+        </div>
+        <SignupForm />
+        <div className="mt-4 text-center text-sm">
+          Already have an account?{' '}
+          <Link className="underline" href="/login">
+            Login
+          </Link>
+        </div>
+      </div>
+    </div>
+  );
+}

app/auth/01-auth.ts

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+'use server';
+
+import { db } from '@/drizzle/db';
+import { users } from '@/drizzle/schema';
+import {
+  FormState,
+  LoginFormSchema,
+  SignupFormSchema,
+} from '@/app/auth/definitions';
+import { createSession, deleteSession } from '@/app/auth/02-stateless-session';
+import bcrypt from 'bcrypt';
+import { eq } from 'drizzle-orm';
+import { redirect } from 'next/navigation';
+
+export async function signup(
+  state: FormState,
+  formData: FormData,
+): Promise<FormState> {
+  // 1. Validate form fields
+  const validatedFields = SignupFormSchema.safeParse({
+    name: formData.get('name'),
+    email: formData.get('email'),
+    password: formData.get('password'),
+  });
+
+  // If any form fields are invalid, return early
+  if (!validatedFields.success) {
+    return {
+      errors: validatedFields.error.flatten().fieldErrors,
+    };
+  }
+
+  // 2. Prepare data for insertion into database
+  const { name, email, password } = validatedFields.data;
+
+  // 3. Check if the user's email already exists
+  const existingUser = await db.query.users.findFirst({
+    where: eq(users.email, email),
+  });
+
+  if (existingUser) {
+    return {
+      message: 'Email already exists, please use a different email or login.',
+    };
+  }
+
+  // Hash the user's password
+  const hashedPassword = await bcrypt.hash(password, 10);
+
+  // 3. Insert the user into the database or call an Auth Provider's API
+  const data = await db
+    .insert(users)
+    .values({
+      name,
+      email,
+      password: hashedPassword,
+    })
+    .returning({ id: users.id });
+
+  const user = data[0];
+
+  if (!user) {
+    return {
+      message: 'An error occurred while creating your account.',
+    };
+  }
+
+  // 4. Create a session for the user
+  const userId = user.id.toString();
+  await createSession(userId);
+  redirect('/dashboard');
+}
+
+export async function login(
+  state: FormState,
+  formData: FormData,
+): Promise<FormState> {
+  // 1. Validate form fields
+  const validatedFields = LoginFormSchema.safeParse({
+    email: formData.get('email'),
+    password: formData.get('password'),
+  });
+  const errorMessage = { message: 'Invalid login credentials.' };
+
+  // If any form fields are invalid, return early
+  if (!validatedFields.success) {
+    return {
+      errors: validatedFields.error.flatten().fieldErrors,
+    };
+  }
+
+  // 2. Query the database for the user with the given email
+  const user = await db.query.users.findFirst({
+    where: eq(users.email, validatedFields.data.email),
+  });
+
+  // If user is not found, return early
+  if (!user) {
+    return errorMessage;
+  }
+  // 3. Compare the user's password with the hashed password in the database
+  const passwordMatch = await bcrypt.compare(
+    validatedFields.data.password,
+    user.password,
+  );
+
+  // If the password does not match, return early
+  if (!passwordMatch) {
+    return errorMessage;
+  }
+
+  // 4. If login successful, create a session for the user and redirect
+  const userId = user.id.toString();
+  await createSession(userId);
+  redirect('/dashboard');
+}
+
+export async function logout() {
+  deleteSession();
+  redirect('/login');
+}