laravel 5.6 API 接口开发限制接口访问频率

在laravel 5.6及以上版本中框架中已自带ThrottleRequests,但是为了更好的处理消息，我们可以再新加一个中间件，来更方便的处理相应信息

第一步： php artisan make:middleware ThrottleRequests

在ThrottleRequest类中放入以下代码

namespace App\Http\Middleware;


use Closure;
use Illuminate\Cache\RateLimiter;
use Symfony\Component\HttpFoundation\Response;

class ThrottleRequests
{
    /**
     * The rate limiter instance.
     *
     * @var \Illuminate\Cache\RateLimiter
     */
    protected $limiter;

    /**
     * Create a new request throttler.
     *
     * @param  \Illuminate\Cache\RateLimiter $limiter
     */
    public function __construct(RateLimiter $limiter)
    {
        $this->limiter = $limiter;
    }

    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request $request
     * @param  \Closure $next
     * @param  int $maxAttempts 最大请求次数
     * @param  int $decayMinutes 时间，分为单位
     * @return mixed
     */
    public function handle($request, Closure $next, $maxAttempts = 60, $decayMinutes = 1)
    {
        $key = $this->resolveRequestSignature($request);

        if ($this->limiter->tooManyAttempts($key, $maxAttempts, $decayMinutes)) {
            return $this->buildResponse($key, $maxAttempts);
        }

        $this->limiter->hit($key, $decayMinutes);

        $response = $next($request);

        return $this->addHeaders(
            $response, $maxAttempts,
            $this->calculateRemainingAttempts($key, $maxAttempts)
        );
    }

    /**
     * Resolve request signature.
     *
     * @param  \Illuminate\Http\Request $request
     * @return string
     */
    protected function resolveRequestSignature($request)
    {
        return $request->fingerprint();
    }

    /**
     * Create a 'too many attempts' response.
     *
     * @param  string $key
     * @param  int $maxAttempts
     * @return \Illuminate\Http\Response
     */
    protected function buildResponse($key, $maxAttempts)
    {
        $message = json_encode([
            'data' => [
                'messsage' => '请求次数太多' //may comes from lang file
                ,'code' => 429, //your custom code
                'data'=>''
            ]

        ]);

        $response = new Response($message, 429);

        $retryAfter = $this->limiter->availableIn($key);

        return $this->addHeaders(
            $response, $maxAttempts,
            $this->calculateRemainingAttempts($key, $maxAttempts, $retryAfter),
            $retryAfter
        );
    }

    /**
     * Add the limit header information to the given response.
     *
     * @param  \Symfony\Component\HttpFoundation\Response $response
     * @param  int $maxAttempts
     * @param  int $remainingAttempts
     * @param  int|null $retryAfter
     * @return \Illuminate\Http\Response
     */
    protected function addHeaders(Response $response, $maxAttempts, $remainingAttempts, $retryAfter = null)
    {
        $headers = [
            'X-RateLimit-Limit' => $maxAttempts,
            'X-RateLimit-Remaining' => $remainingAttempts,
        ];

        if (!is_null($retryAfter)) {
            $headers['Retry-After'] = $retryAfter;
            $headers['Content-Type'] = 'application/json';
        }

        $response->headers->add($headers);

        return $response;
    }

    /**
     * Calculate the number of remaining attempts.
     *
     * @param  string $key
     * @param  int $maxAttempts
     * @param  int|null $retryAfter
     * @return int
     */
    protected function calculateRemainingAttempts($key, $maxAttempts, $retryAfter = null)
    {
        if (!is_null($retryAfter)) {
            return 0;
        }

        return $this->limiter->retriesLeft($key, $maxAttempts);
    }
}

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