Let's create the project login route, let's focus on this structure below.

.
├── src
│   └── router
│       └── index.js

In the index.js file we will add the following:

import { createRouter, createWebHistory } from 'vue-router'
import { getAuth, onAuthStateChanged } from 'firebase/auth'
import Login from '@/module/login/view/login.vue'
import Register from '@/module/register/view/register.vue'
import Home from '@/module/home/view/home.vue'

const router = createRouter({
  history: createWebHistory(),
  routes: [
    {
      path: '/',
      name: 'home',
      component: Home,
      meta: {
        requiresAuth: true
      }
    },
    {
      path: '/login',
      name: 'Login',
      component: Login
    },
    {
      path: '/cadastro',
      name: 'Register',
      component: Register
    }
  ]
})

const getCurrentUser = () => {
  return new Promise((resolve, reject) => {
    const removeListener = onAuthStateChanged(
      getAuth(),
      (user) => {
        removeListener()
        resolve(user)
      },
      reject
    )
  })
}

router.beforeEach(async (to, from, next) => {
  const currentUser = await getCurrentUser()

  if (to.matched.some((record) => record.meta.requiresAuth)) {
    if (currentUser) {
      next()
    } else {
      alert("Você n?o tem acesso a essa página, por favor, autentique-e!")
      next('/login')
    }
  } else if (
    currentUser &&
    (to.path === '/login' || to.path === '/cadastro'
  ) {
    next('/')
  } else {
    next()
  }
})

export default router

Note that now, our route file is much fuller, we added the firebase/auth import so we can create validations so that the user cannot access the screens without being authenticated.

In short, this part underneath the const router checks user authentication before each navigation on protected routes. The getCurrentUser function uses the onAuthStateChanged method to monitor authentication and returns a promise with the authenticated user. In router.beforeEach, it checks whether the route requires authentication (indicated by meta.requiresAuth). If the route is protected and the user is authenticated, it allows access (next()). If the user is not authenticated, it displays an alert and redirects to /login. If the user is already authenticated and tries to access /login or /cadastro, it redirects them to the home page (/), in addition, we added a route to Home and another to /login.

About Home, I'm not going to create the file, I just put it there so you can see how it will work to check whether or not the user can have access.

Now, let's move on to creating our actual registration component, its functions and its call, so let's focus on this structure.

.
├── src
│   └── module
│       └── login
|           └── component
|               └── formlogin.vue
|           └── controller
|               └── loginController.js
|           └── view
|               └── login.vue

formLogin.vue file.

<template>
  <div class="d-flex justify-center align-center fill-height">
    <v-card class="mx-auto px-6 py-8" max-width="400" min-width="300">
      <v-form :disabled="controller.loading.value" :readonly="controller.loading.value">
        <h1 class="text-center mb-3">Entrar</h1>
        <v-text-field
          class="mb-2"
          label="E-mail"
          variant="underlined"
          clearable
          :rules="[controller.regras.required, controller.regras.validEmail]"
          v-model="controller.email.value"
        ></v-text-field>

        <v-text-field
          label="Senha"
          placeholder="Informe sua senha"
          variant="underlined"
          clearable
          @click:append-inner="controller.showPassword.value = !controller.showPassword.value"
          :append-inner-icon="controller.showPassword.value ? 'mdi-eye' : 'mdi-eye-off'"
          :type="controller.showPassword.value ? 'text' : 'password'"
          :rules="[
            controller.regras.required,
            (v) => (v && v.length >= 6) || 'A senha deve ter no mínimo 6 caracteres'
          ]"
          v-model="controller.password.value"
        ></v-text-field>

        <p v-if="controller.errMsg.value" class="text-red text-center">
          {{ controller.errMsg.value }}
        </p>

        <br />

        <v-btn
          color="#5865f2"
          size="large"
          type="submit"
          variant="elevated"
          block
          :loading="controller.loading.value"
          :disabled="
            !controller.password.value ||
            controller.password.value.length < 6 ||
            controller.loading.value
          "
          @click="controller.login"
        >
          Entrar
        </v-btn>

        <br />

        <v-divider class="mx-10"></v-divider>

        <div class="d-flex justify-center mt-3">
          <button @click="controller.signInWithGoogle">
            <v-avatar :image="logoGoogle"></v-avatar>
          </button>
        </div>

        <p class="text-center mt-5">
          Ainda n?o possui uma conta? <a href="/cadastro">Cadastre-se</a>
        </p>
      </v-form>
    </v-card>
  </div>
</template>

<script setup>
import logoGoogle from '../../../assets/images/imagem_logo_google.png'

const { controller } = defineProps({
  controller: { type: Object, required: true }
})
</script>

loginController.js file.

import { ref } from 'vue'
import {
  getAuth,
  signInWithEmailAndPassword,
  GoogleAuthProvider,
  signInWithPopup,
} from 'firebase/auth'
import { useRouter } from 'vue-router'

const loginController = () => {
  const email = ref('')
  const password = ref('')
  const errMsg = ref('')
  const loading = ref(false)
  const showPassword = ref(false)
  const regras = {
    required: (v) => !!v || 'Obrigatório',
    validEmail: (v) => {
    if (v.length > 0) {
      const pattern =
        /^(([^<>()[\]\.,;:\s@"]+(\.[^<>()[\]\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/
      return pattern.test(v) || 'E-mail inválido'
    }

    return true
  },
  const router = useRouter()
  const auth = getAuth()

  // Essa fun??o é responsável por realizar o login com o firebase apenas informando o e-mail e senha
  const login = async () => {
    try {
      loading.value = true
      errMsg.value = ''

      await signInWithEmailAndPassword(auth, email.value, password.value)

      router.push('/')
    } catch (error) {
      // Note que aqui, temos um switch/case com os possíveis erros que o firebase retorna, essa variável `errMsg` está lá no `formLogin.vue` para que o usuário possa ver o erro que está retornando
      switch (error.code) {
        case 'auth/invalid-email':
          errMsg.value = 'E-mail inválido!'
          break
        case 'auth/user-not-found':
          errMsg.value = 'Usuário n?o encontrado!'
          break
        case 'auth/wrong-password':
          errMsg.value = 'Senha incorreta!'
          break
        default:
          errMsg.value = 'E-mail ou senha incorretos!'
          break
      }
    } finally {
      loading.value = false
    }
  }

  // Essa fun??o é responsável por realizar o login com o firebase utilizando o provedor Google
  const signInWithGoogle = async () => {
    try {
      loading.value = true

      const provider = new GoogleAuthProvider()
      await signInWithPopup(auth, provider)

      router.push('/')
    } catch (error) {
      alert(error)
    } finally {
      loading.value = false
    }
  }

  return {
    email,
    password,
    errMsg,
    loading,
    showPassword,
    regras,
    login,
    signInWithGoogle
  }
}

export { loginController }

Login.vue file.

<template>
  <form-login :controller="controller" />
</template>

<script setup>
import { loginController } from '../controller/loginController'
import FormLogin from '../component/formLogin.vue'
const controller = loginController()
</script>

And with that, we finish our registration and login screens, in this post we add the route to /login, we add validations to router/index.js so that the user can only access the home page if they are authenticated and we create the login component , at the end of everything, accessing /login you should see a screen similar to the one below:

I thank you for reading my post until the end, I hope this helps many people who are having difficulty making it work or who are starting to develop. Any problems you have, please don't hesitate to comment and whenever I can I will analyze your problem and try to help you.

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