full-stack-fastapi-template/new-frontend/src/routes/login.tsx

import React from 'react';

import { ViewIcon, ViewOffIcon } from '@chakra-ui/icons';
import { Button, Center, Container, FormControl, FormErrorMessage, Icon, Image, Input, InputGroup, InputRightElement, Link, useBoolean } from '@chakra-ui/react';
import { Link as RouterLink, createFileRoute, redirect } from '@tanstack/react-router';
import { SubmitHandler, useForm } from 'react-hook-form';

import Logo from '../assets/images/fastapi-logo.svg';
import { ApiError } from '../client';
import { Body_login_login_access_token as AccessToken } from '../client/models/Body_login_login_access_token';
import useAuth, { isLoggedIn } from '../hooks/useAuth';

export const Route = createFileRoute('/login')({
  component: Login,
  beforeLoad: async () => {
    if (isLoggedIn()) {
      throw redirect({
        to: '/',
      })
    }
  }
})

function Login() {
  const [show, setShow] = useBoolean();
  const { login } = useAuth();
  const [error, setError] = React.useState<string | null>(null);
  const { register, handleSubmit, formState: { errors, isSubmitting } } = useForm<AccessToken>({
    mode: 'onBlur',
    criteriaMode: 'all',
    defaultValues: {
      username: '',
      password: ''
    }
  });

  const onSubmit: SubmitHandler<AccessToken> = async (data) => {
    try {
      await login(data);
    } catch (err) {
      const errDetail = (err as ApiError).body.detail;
      setError(errDetail)
    }
  };

  return (
    <>
      <Container
        as='form'
        onSubmit={handleSubmit(onSubmit)}
        h='100vh'
        maxW='sm'
        alignItems='stretch'
        justifyContent='center'
        gap={4}
        centerContent
      >
        <Image src={Logo} alt='FastAPI logo' height='auto' maxW='2xs' alignSelf='center' mb={4} />
        <FormControl id='username' isInvalid={!!errors.username || !!error}>
          <Input id='username' {...register('username', { pattern: { value: /^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i, message: 'Invalid email address' } })} placeholder='Email' type='text' />
          {errors.username && <FormErrorMessage>{errors.username.message}</FormErrorMessage>}
        </FormControl>
        <FormControl id='password' isInvalid={!!error}>
          <InputGroup>
            <Input
              {...register('password')}
              type={show ? 'text' : 'password'}

              placeholder='Password'
            />
            <InputRightElement
              color='gray.400'
              _hover={{
                cursor: 'pointer',
              }}
            >
              <Icon onClick={setShow.toggle} aria-label={show ? 'Hide password' : 'Show password'}>
                {show ? <ViewOffIcon /> : <ViewIcon />}
              </Icon>
            </InputRightElement>
          </InputGroup>
          {error && <FormErrorMessage>
            {error}
          </FormErrorMessage>}
        </FormControl>
        <Center>
          <Link as={RouterLink} to='/recover-password' color='blue.500'>
            Forgot password?
          </Link>
        </Center>
        <Button bg='ui.main' color='white' _hover={{ opacity: 0.8 }} type='submit' isLoading={isSubmitting}>
          Log In
        </Button>
      </Container>
    </>
  );
};

export default Login;