PHP의 OAuth: JWT 인증 서버 만들기

composer require firebase/php-jwt

<?php
require 'vendor/autoload.php';

use FirebaseJWTJWT;

// 定义服务器密钥
$server_key = 'your-secret-key';

// 定义过期时间，单位为秒
$expiry_time = 3600;

// 定义有效的客户端ID和秘密
$valid_clients = [
    'client_id1' => 'client_secret1',
    'client_id2' => 'client_secret2',
];

// 验证客户端ID和秘密
function verify_client_credentials($client_id, $client_secret) {
    global $valid_clients;
    return isset($valid_clients[$client_id]) && $valid_clients[$client_id] === $client_secret;
}

// 授权服务器端点
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    // 验证客户端身份
    $client_id = $_POST['client_id'];
    $client_secret = $_POST['client_secret'];
    if (!verify_client_credentials($client_id, $client_secret)) {
        http_response_code(401);
        echo json_encode(['error' => 'Invalid client credentials']);
        exit;
    }

    // 创建JWT
    $token = [
        'iss' => $_SERVER['SERVER_NAME'],
        'aud' => $client_id,
        'iat' => time(),
        'exp' => time() + $expiry_time
    ];
    $jwt = JWT::encode($token, $server_key);

    // 返回JWT给客户端
    echo json_encode(['access_token' => $jwt]);
    exit;
}

// 获取JWT
if ($_SERVER['REQUEST_METHOD'] === 'GET') {
    $auth_header = $_SERVER['HTTP_AUTHORIZATION'];
    $jwt = substr($auth_header, 7); // 去掉"Bearer "前缀

    try {
        // 验证和解码JWT
        $decoded = JWT::decode($jwt, $server_key, ['HS256']);
        
        // 验证有效性
        if ($decoded->exp < time()) {
            http_response_code(401);
            echo json_encode(['error' => 'Token expired']);
            exit;
        }

        // 返回用户信息或其他受保护的资源
        echo json_encode(['user_id' => $decoded->sub]);
        exit;
    } catch (Exception $e) {
        // 如果JWT无效，返回错误
        http_response_code(401);
        echo json_encode(['error' => $e->getMessage()]);
        exit;
    }
}
?>