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<?php |
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declare (strict_types = 1); |
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namespace think\middleware; |
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use Closure; |
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use think\Cache; |
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use think\Config; |
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use think\Request; |
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use think\Response; |
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/** |
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* 访问频率限制 |
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* Class Throttle |
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* @package think\middleware |
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*/ |
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class Throttle |
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{ |
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/** |
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* 缓存对象 |
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* @var Cache |
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*/ |
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protected $cache; |
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/** |
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* 配置参数 |
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* @var array |
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*/ |
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protected $config = [ |
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// 节流规则 true为自动规则 |
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'key' => true, |
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// 节流频率 null 表示不限制 eg: 10/m 20/h 300/d |
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'visit_rate' => null, |
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'visit_fail_text' => '访问频率受到限制，请稍等 %s秒 再试', |
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]; |
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protected $wait_seconds = 0; |
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protected $duration = [ |
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's' => 1, |
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'm' => 60, |
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'h' => 3600, |
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'd' => 86400, |
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]; |
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public function __construct(Cache $cache, Config $config) |
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{ |
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$this->cache = $cache; |
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$this->config = array_merge($this->config, $config->get('middleware.throttle', [])); |
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} |
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/** |
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* 生成缓存的 key |
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* @param Request $request |
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* @return null|string |
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*/ |
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protected function getCacheKey($request) |
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{ |
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$key = $this->config['key']; |
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if ($key instanceof \Closure) { |
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$key = call_user_func($key, $this, $request); |
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} |
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if (false === $key || null === $this->config['visit_rate']) { |
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// 关闭当前限制 |
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return; |
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} |
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if (true === $key) { |
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$key = $request->ip(); |
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} elseif (false !== strpos($key, '__IP__')) { |
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$key = str_replace('__IP__', $request->ip(), $key); |
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} |
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return md5($key); |
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} |
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/** |
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* 解析频率配置项 |
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* @param $rate |
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* @return array |
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*/ |
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protected function parseRate($rate) |
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{ |
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list($num, $period) = explode("/", $rate); |
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$num_requests = intval($num); |
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$duration = $this->duration[$period]; |
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return [$num_requests, $duration]; |
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} |
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/** |
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* 计算距离下次合法请求还有多少秒 |
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* @param $history |
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* @param $now |
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* @param $num_requests |
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* @param $duration |
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* @return void |
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*/ |
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protected function wait($history, $now, $num_requests, $duration) |
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{ |
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$wait_seconds = $history ? $duration - ($now - $history[0]) : $duration; |
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if ($wait_seconds <= 0) { |
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$wait_seconds = 0; |
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} |
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$this->wait_seconds = $wait_seconds; |
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} |
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/** |
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* 请求是否允许 |
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* @param $request |
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* @return bool |
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*/ |
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protected function allowRequest($request) |
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{ |
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$key = $this->getCacheKey($request); |
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if (null === $key) { |
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return true; |
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} |
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list($num_requests, $duration) = $this->parseRate($this->config['visit_rate']); |
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$history = $this->cache->get($key, []); |
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$now = time(); |
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// 移除过期的请求的记录 |
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$history = array_values(array_filter($history, function($val) use ($now, $duration) { |
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return $val >= $now - $duration; |
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})); |
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if (count($history) <= $num_requests) { |
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// 允许访问 |
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$history[] = $now; |
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$this->cache->set($key, $history, $now + $duration); |
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return true; |
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} |
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$this->wait($history, $now, $num_requests, $duration); |
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return false; |
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} |
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/** |
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* 处理限制访问 |
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* @param Request $request |
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* @param Closure $next |
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* @return Response |
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*/ |
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public function handle($request, Closure $next) |
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{ |
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$allow = $this->allowRequest($request); |
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if (!$allow) { |
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return Response::create(sprintf($this->config['visit_fail_text'], $this->wait_seconds))->code(403); |
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} |
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$response = $next($request); |
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return $response; |
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} |
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public function setRate($rate) { |
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$this->config['visit_rate'] = $rate; |
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} |
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} |
top-think /
framework
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