Question

您好我在lynda的课程中使用Slim创建了一个Web服务＆＃34;在PHP中使用Slim Micro Framework构建API＆＃34;但是当我想登录时，会发生此错误

注意：第12行的C：\ wamp64 \ www \ lynda2 \ src \ Chatter \ Middleware \ Authentication.php中未定义的偏移量为0

验证





    namespace Chatter\Middleware;

    use Chatter\Models\User;

    class Authentication
    {
        public function __invoke($request, $response, $next)
        {
            $auth = $request->getHeader('Authorization');
            $_apikey = $auth[0];
            $apikey = substr($_apikey, strpos($_apikey, ' ') + 1);

            $user = new User();
            if (!$user->authenticate($apikey)) {
                $response->withStatus(401);

                return $response;
            }

            $response = $next($request, $response);

            return $response;
        }
    }

User.php


<pre><code>


namespace Chatter\Models;

class User extends \Illuminate\Database\Eloquent\Model
{
    public function authenticate($apikey)
    {
        $user = User::where('apikey', '=', $apikey)->take(1)->get();
        $this->details = $user[0];

        return ($user[0]->exists) ? true : false;
    }
}

</code></pre>

index.php

<pre><code>

require 'vendor/autoload.php';
include 'bootstrap.php';

use Chatter\Models\Message;
use Chatter\Middleware\Logging as ChatterLogging;
use Chatter\Middleware\Authentication as ChatterAuth;

$app = new \Slim\App();
$app->add(new ChatterAuth());
$app->add(new ChatterLogging());

$app->get('/messages', function ($request, $response, $args) {
    $_message = new Message();

    $messages = $_message->all();

    $payload = [];
    foreach($messages as $_msg) {
        $payload[$_msg->id] = ['body' => $_msg->body, 'user_id' => $_msg->user_id, 'created_at' => $_msg->created_at];
    }

    return $response->withStatus(200)->withJson($payload);
});


$app->get('/', function ($request, $response, $args) {
    return "This is a catch all route for the root that doesn't do anything useful.";
});

// Run app
$app->run();



</code></pre>

Answer 1

错误表明当您＆＃34;登录＆＃34;没有授权标题。

$request->getHeader('Authorization')返回一个空数组，因此当您尝试访问数组的第一个元素时，会出现错误：

$_apikey = $auth[0]; // Will trigger error, since there are no elements in the array

因此，要避免此错误，请按以下方式获取$apikey：

public function __invoke($request, $response, $next)
{
    $auth = $request->getHeader('Authorization');
    $_apikey = array_shift($auth);
    if ($_apikey) {
        $apikey = substr($_apikey, strpos($_apikey, ' ') + 1);
        $user = new User();
        if (!$user->authenticate($apikey)) {
            return $response->withStatus(401);
        } else {
            return $next($request, $response);
        }
    } else {
        // Authorization header is missing, therefore unauthorized access
        return $response->withStatus(401);
    }
}

Answer 2

这是一个较旧的线程，但万一其他人正在关注本教程...... OP 发布的代码应该完全按照它的功能执行 - 如果不存在授权标头，则会失败。看起来 OP 错过了一步：将不记名令牌添加到请求中。在 Postman 中，转到 Authorization > Type > Bearer Token 并在输入字段中粘贴有效令牌。我相信它在教程中已经明确说明。之后，一切都按预期进行。

注意：未定义的偏移量：在第12行的C：\ wamp64 \ www \ lynda2 \ src \ Chatter \ Middleware \ Authentication.php中为0

2 个答案: