From c097dd57596cbc8020d678669ddca0ee2418bf39 Mon Sep 17 00:00:00 2001
From: Saiat Kalbiev <kalbievich11@gmail.com>
Date: Thu, 25 Apr 2019 15:02:02 +0400
Subject: [PATCH] Add GlobalPageCacheBehaviour class

---
 behaviours/GlobalPageCacheBehaviour.php | 136 ++++++++++++++++++++++++
 1 file changed, 136 insertions(+)
 create mode 100755 behaviours/GlobalPageCacheBehaviour.php

diff --git a/behaviours/GlobalPageCacheBehaviour.php b/behaviours/GlobalPageCacheBehaviour.php
new file mode 100755
index 0000000..d1f4b31
--- /dev/null
+++ b/behaviours/GlobalPageCacheBehaviour.php
@@ -0,0 +1,136 @@
+<?php
+
+namespace apollo11\yii2GlobalBehaviours\behaviours;
+
+use apollo11\yii2GlobalBehaviours\exceptions\GlobalPageCacheException;
+use yii\base\Behavior;
+use yii\base\Controller;
+use Yii;
+
+/**
+ * Class GlobalCacheBehavior
+ * @package common\behaviors
+ */
+class GlobalPageCacheBehaviour extends Behavior
+{
+
+    const VARIATION_BY_LANGUAGE = 'variation_by_language';
+    const VARIATION_BY_URL = 'variation_by_url';
+
+    /**
+     * @var array
+     */
+    public $rules = [];
+
+    /**
+     * @var array
+     */
+    public $variations = [];
+
+    /**
+     * @var integer
+     */
+    public $duration = 60;
+
+    /**
+     * @return array
+     * @author Saiat Kalbiev <kalbievich11@gmail.com>
+     */
+    public function events()
+    {
+        return [
+            Controller::EVENT_BEFORE_ACTION => 'beforeAction'
+        ];
+    }
+
+    /**
+     * @author Saiat Kalbiev <kalbievich11@gmail.com>
+     * @throws GlobalPageCacheException
+     */
+    public function beforeAction()
+    {
+        if (!$this->rules) {
+            throw new GlobalPageCacheException('Invalid rules provided');
+        }
+
+        $currentControllerId = Yii::$app->controller->id;
+        $currentActionId = Yii::$app->controller->action->id;
+
+        foreach ($this->rules as $rule) {
+
+            if (!isset($rule['controller']) || !$rule['controller']) {
+                throw new GlobalPageCacheException('Invalid rule. Controller id not provided.');
+            }
+
+            if ($rule['controller'] == $currentControllerId) {
+
+                if (isset($rule['duration']) && $rule['duration']) {
+                    $this->duration = $rule['duration'];
+                }
+
+                if (!isset($rule['actions']) || !$rule['actions']) {
+                    throw new GlobalPageCacheException('Invalid rule. Action id(s) not provided.');
+                }
+
+                if (isset($rule['except'])) {
+
+                    if (!is_array($rule['except'])) {
+                        throw new GlobalPageCacheException('Invalid rule. Except parameter should be of type array.');
+                    }
+
+                    if (in_array($currentActionId, $rule['except'])) {
+                        return;
+                    }
+                }
+
+                if (in_array('*', $rule['actions']) || in_array($currentActionId, $rule['actions'])) {
+                    $this->attachBehavior($rule);
+                }
+            }
+        }
+    }
+
+    /**
+     * @param $rule array
+     * @return array
+     * @author Saiat Kalbiev <kalbievich11@gmail.com>
+     * @throws GlobalPageCacheException
+     */
+    private function generateVariations($rule)
+    {
+        $variations = [];
+
+        if (isset($rule['variations'])) {
+
+            if (!is_array($rule['variations'])) {
+                throw new GlobalPageCacheException('Invalid rule. Variations parameter should be of type array.');
+            }
+
+            foreach ($rule['variations'] as $variation) {
+                if ($variation == self::VARIATION_BY_LANGUAGE) {
+                    $variations[] = \Yii::$app->language;
+                } else if ($variation == self::VARIATION_BY_URL) {
+                    $variations[] = Yii::$app->request->absoluteUrl;
+                }
+            }
+        }
+
+        return $variations;
+    }
+
+    /**
+     * @param $rule array
+     * @author Saiat Kalbiev <kalbievich11@gmail.com>
+     * @throws GlobalPageCacheException
+     */
+    private function attachBehavior($rule)
+    {
+        $variations = $this->generateVariations($rule);
+
+        Yii::$app->controller->attachBehavior('pageCacheBehaviour', [
+            'class' => 'yii\filters\PageCache',
+            'duration' => $this->duration,
+            'variations' => $variations
+        ]);
+    }
+}