使用 OAuth 2.0 实现 PHP 安全验证

<?php
// 定义 client ID 和 client secret
$clientID = "your-client-id";
$clientSecret = "your-client-secret";

// 定义回调 URL
$callbackURL = "http://example.com/callback.php";

// 如果用户未登录，重定向到授权页面
if (empty($_GET['code'])) {
    $authorizationURL = "https://oauth.com/authorize";
    $redirectURL = $authorizationURL . "?client_id=" . $clientID . "&redirect_uri=" . $callbackURL . "&response_type=code";
    header("Location: $redirectURL");
    exit;
}

// 获取授权码
$authCode = $_GET['code'];

// 获取访问令牌
$tokenURL = "https://oauth.com/token";
$curl = curl_init($tokenURL);
curl_setopt($curl,CURLOPT_POST,true);
curl_setopt($curl,CURLOPT_POSTFIELDS,"client_id=".$clientID."&client_secret=".$clientSecret."&code=".$authCode."&redirect_uri=".$callbackURL."&grant_type=authorization_code");
curl_setopt($curl,CURLOPT_RETURNTRANSFER,true);
$response = curl_exec($curl);
curl_close($curl);

// 解析访问令牌
$tokenObj = json_decode($response);
$accessToken = $tokenObj->access_token;

// 使用访问令牌进行 API 访问
$userURL = "https://oauth.com/user";
$curl = curl_init($userURL);
$header = array(
    "Authorization: Bearer " . $accessToken
);
curl_setopt($curl, CURLOPT_HTTPHEADER, $header);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($curl);
curl_close($curl);

// 解析用户信息
$userObj = json_decode($response);
$userID = $userObj->id;
$username = $userObj->username;
$email = $userObj->email;

// 显示用户信息
echo "User ID: " . $userID . "<br>";
echo "Username: " . $username . "<br>";
echo "Email: " . $email . "<br>";
?>