我目前正在一个NextJS应用程序中尝试设置Firebase v9认证。我最初尝试使用Next的服务器端环境变量作为Firebase配置，但注意到我的所有环境变量都未定义。但后来我更新了我的Firebase配置，使用NEXT_PUBLIC_，然后它就工作正常了。所以我想我的问题是：
1.向浏览器公开Firebase Config变量是否安全？
1.如果它不安全，你如何确保应用程序在服务器端初始化，然后在客户端使用？（链接任何特定的指南或文章将不胜感激）
下面我按顺序提供了我的firebase配置文件、AuthContext提供程序和登录页面。

import { initializeApp } from 'firebase/app';
import { getAuth } from 'firebase/auth';

const firebaseConfig = {
  apiKey: process.env.NEXT_PUBLIC_FIREBASE_API_KEY,
  authDomain: process.env.NEXT_PUBLIC_FIREBASE_AUTH_DOMAIN,
  databaseURL: process.env.NEXT_PUBLIC_FIREBASE_DATABASE_URL,
  projectId: process.env.NEXT_PUBLIC_FIREBASE_PROJECT_ID,
  storageBucket: process.env.NEXT_PUBLIC_FIREBASE_STORAGE_BUCKET_URL,
  messagingSenderId: process.env.NEXT_PUBLIC_FIREBASE_MESSAGING_SENDER_ID,
  appId: process.env.NEXT_PUBLIC_FIREBASE_APP_ID,
  measurementId: process.env.NEXT_PUBLIC_FIREBASE_MEASUREMENT_ID,
};

const app = initializeApp(firebaseConfig);
export const auth = getAuth();

import { createContext, useContext, useEffect, useState } from 'react';
import {
  onAuthStateChanged,
  signInWithEmailAndPassword,
  signOut,
} from 'firebase/auth';
import { auth } from '@/lib/firebaseApp';

const AuthContext = createContext({});

export const useAuth = () => useContext(AuthContext);

export function AuthContextProvider({ children }) {
  const [user, setUser] = useState({ email: null, uid: null });
  const [loading, setLoading] = useState(true);
  useEffect(() => {
    const unsubscribe = onAuthStateChanged(auth, (user) => {
      if (user) {
        setUser({
          email: user.email,
          uid: user.uid,
        });
      } else {
        setUser({ email: null, uid: null });
      }
    });
    setLoading(false);
    return () => unsubscribe();
  }, []);

  function login(email, password) {
    return signInWithEmailAndPassword(auth, email, password);
  }

  async function logout() {
    setUser({ email: null, uid: null });
    await signOut(auth);
  }

  return (
    <AuthContext.Provider value={{ user, login, logout }}>
      {loading ? null : children}
    </AuthContext.Provider>
  );
}

import { useState } from 'react';
import { useRouter } from 'next/router';

import { Button } from '@/components';
import { useAuth } from '@/context/AuthContext';

export default function Login() {
  const [email, setEmail] = useState('');
  const [password, setPassword] = useState('');
  const { login } = useAuth();
  const router = useRouter();

  async function handleSubmit(event) {
    event.preventDefault();
    try {
      await login(email, password);
      router.push('/dashboard');
    } catch (error) {
      console.log(error.message);
    }
  }

  return (
    <div className="flex min-h-full flex-col justify-center py-12 sm:px-6 lg:px-8">
      <div className="mt-8 sm:mx-auto sm:w-full sm:max-w-md">
        <div className="mx-auto w-11/12 rounded-2xl border border-zinc-100 p-6 py-8 px-4 dark:border-zinc-700/40 sm:px-10 md:w-full">
          <form className="space-y-6" onSubmit={(event) => handleSubmit(event)}>
            <div>
              <label
                htmlFor="email"
                className="block text-sm font-semibold text-zinc-900 dark:text-zinc-100"
              >
                Email address
              </label>
              <div className="mt-1">
                <input
                  id="email"
                  name="email"
                  type="email"
                  autoComplete="email"
                  required
                  className="block w-full appearance-none rounded-md border border-zinc-900/10 bg-white px-3 py-2 shadow-sm shadow-zinc-800/5 placeholder:text-zinc-400 focus:border-teal-500 focus:outline-none focus:ring-4 focus:ring-teal-500/10 dark:border-zinc-700 dark:bg-zinc-700/[0.15] dark:text-zinc-200 dark:placeholder:text-zinc-500 dark:focus:border-teal-400 dark:focus:ring-teal-400/10 sm:text-sm"
                  onChange={(e) => setEmail(e.target.value)}
                />
              </div>
            </div>
            <div>
              <label
                htmlFor="password"
                className="block text-sm font-semibold text-zinc-900 dark:text-zinc-100"
              >
                Password
              </label>
              <div className="mt-1">
                <input
                  id="password"
                  name="password"
                  type="password"
                  autoComplete="current-password"
                  required
                  className="block w-full appearance-none rounded-md border border-zinc-900/10 bg-white px-3 py-2 shadow-sm shadow-zinc-800/5 placeholder:text-zinc-400 focus:border-teal-500 focus:outline-none focus:ring-4 focus:ring-teal-500/10 dark:border-zinc-700 dark:bg-zinc-700/[0.15] dark:text-zinc-200 dark:placeholder:text-zinc-500 dark:focus:border-teal-400 dark:focus:ring-teal-400/10 sm:text-sm"
                  onChange={(e) => setPassword(e.target.value)}
                />
              </div>
            </div>
            <div className="flex w-full justify-center">
              <Button type="submit" className="w-10/12 px-6 py-4 md:w-5/6">
                Sign In
              </Button>
            </div>
          </form>
        </div>
      </div>
    </div>
  );
}