使用 firebase Vue JS 登录/注册#STEP（登录）

我们来创建项目登录路由，下面重点关注这个结构。

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

在index.js 文件中，我们将添加以下内容：

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 não 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

请注意，现在，我们的路由文件更加完整，我们添加了 firebase/auth 导入，以便我们可以创建验证，以便用户在未经身份验证的情况下无法访问屏幕。

简而言之，常量路由器下的这部分在每次在受保护的路线上导航之前检查用户身份验证。 getCurrentUser 函数使用 onAuthStateChanged 方法来监视身份验证并返回经过身份验证的用户的承诺。在router.beforeEach中，它检查路由是否需要身份验证（由meta.requiresAuth指示）。如果路由受到保护并且用户经过身份验证，则允许访问（next()）。如果用户未通过身份验证，则会显示警报并重定向到 /login。如果用户已经通过身份验证并尝试访问 /login 或 /cadastro，则会将其重定向到主页 (/)，此外，我们添加了一条到 Home 的路由和另一个到 /login 的路由。

关于主页，我不会创建该文件，我只是将其放在那里，以便您可以看到它如何检查用户是否可以访问。

---

现在，让我们继续创建实际的注册组件、它的函数和调用，所以让我们重点关注这个结构。

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

formLogin.vue 文件。

<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 não 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 文件。

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 função 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 não 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 função 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 文件。

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

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

这样，我们就完成了注册和登录屏幕，在这篇文章中，我们将路由添加到 /login，我们将验证添加到 router/index.js，以便用户只有通过身份验证才能访问主页，并且我们创建登录组件，在一切结束时，访问 /login 您应该看到类似于下面的屏幕：

感谢您阅读我的文章直到最后，我希望这可以帮助许多遇到困难或开始发展的人。如果您有任何问题，请随时发表评论，只要有可能，我会分析您的问题并尽力帮助您。

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