PHP和Vue.js开发防御跨站请求伪造（CSRF）攻击的应用程序

<?php
session_start();

function generateCSRFToken() {
  $token = bin2hex(random_bytes(32));
  $_SESSION['csrf_token'] = $token;
  return $token;
}

function login() {
  // 处理用户登录逻辑
}

function register() {
  // 处理用户注册逻辑
}

// 处理用户注册请求
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['register'])) {
  $username = $_POST['username'];
  $password = $_POST['password'];
  
  // 检查CSRF token
  if (!hash_equals($_SESSION['csrf_token'], $_POST['csrf_token'])) {
    echo "CSRF token验证失败！";
    return;
  }
  
  // 注册用户
  register($username, $password);
}

// 处理用户登录请求
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['login'])) {
  $username = $_POST['username'];
  $password = $_POST['password'];
  
  // 检查CSRF token
  if (!hash_equals($_SESSION['csrf_token'], $_POST['csrf_token'])) {
    echo "CSRF token验证失败！";
    return;
  }
  
  // 登录用户
  login($username, $password);
}
?>

<template>
  <div>
    <h1>欢迎使用我们的应用程序</h1>
    <form @submit.prevent="register">
      <input type="text" v-model="username" placeholder="用户名" required>
      <input type="password" v-model="password" placeholder="密码" required>
      <input type="hidden" name="csrf_token" :value="csrfToken">
      <button type="submit">注册</button>
    </form>
    <form @submit.prevent="login">
      <input type="text" v-model="username" placeholder="用户名" required>
      <input type="password" v-model="password" placeholder="密码" required>
      <input type="hidden" name="csrf_token" :value="csrfToken">
      <button type="submit">登录</button>
    </form>
  </div>
</template>

<script>
export default {
  data() {
    return {
      username: '',
      password: '',
      csrfToken: ''
    }
  },
  mounted() {
    // 获取CSRF token
    this.csrfToken = document.querySelector('meta[name="csrf-token"]').content;
  },
  methods: {
    register() {
      // 发送注册请求
      axios.post('/register.php', {
        username: this.username,
        password: this.password,
        csrf_token: this.csrfToken
      })
      .then(response => {
        // 处理注册成功的逻辑
      })
      .catch(error => {
        // 处理注册失败的逻辑
      });
    },
    login() {
      // 发送登录请求
      axios.post('/login.php', {
        username: this.username,
        password: this.password,
        csrf_token: this.csrfToken
      })
      .then(response => {
        // 处理登录成功的逻辑
      })
      .catch(error => {
        // 处理登录失败的逻辑
      });
    }
  }
}
</script>