增加扩展机制定位文件；将common模块实现扩展模式；发布新版本；

extend/base/common/controller/TimerControllerBase.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace base\common\controller;
+
+use app\common\controller\ToolsController;
+use think\facade\Cache;
+
+class TimerControllerBase extends ToolsController
+{
+    protected $frequency = null;
+
+    public function initialize()
+    {
+        parent::initialize();
+
+        if (is_int($this->frequency)) {
+            $this->protectVisit($this->frequency);
+        }
+    }
+
+    protected function protectVisit(int $frequency)
+    {
+        $cache_tag = 'timer_protect';
+
+        $cache_key = 'timer_protect_' . md5($this->request->url());
+
+        $last_exec_time = Cache::get($cache_key, 0);
+
+        if ($last_exec_time >= time() - $frequency) {
+            return $this->error('请不要频繁请求');
+        }
+
+        Cache::tag($cache_tag)->set($cache_key, time());
+    }
+}