Add new SessionCache class

system/src/Grav/Framework/Cache/AbstractCache.php

@@ -8,6 +8,8 @@
 
 namespace Grav\Framework\Cache;
 
+use Grav\Framework\Cache\Exception\InvalidArgumentException;
+
 /**
  * Cache trait for PSR-16 compatible "Simple Cache" implementation
  * @package Grav\Framework\Cache
@@ -19,6 +21,7 @@ abstract class AbstractCache implements CacheInterface
     /**
      * @param string $namespace
      * @param null|int|\DateInterval $defaultLifetime
+     * @throws InvalidArgumentException
      */
     public function __construct($namespace = '', $defaultLifetime = null)
     {

system/src/Grav/Framework/Cache/Adapter/SessionCache.php

@@ -0,0 +1,72 @@
+<?php
+/**
+ * @package    Grav\Framework\Cache
+ *
+ * @copyright  Copyright (C) 2014 - 2017 RocketTheme, LLC. All rights reserved.
+ * @license    MIT License; see LICENSE file for details.
+ */
+
+namespace Grav\Framework\Cache\Adapter;
+
+use Grav\Framework\Cache\AbstractCache;
+
+/**
+ * Cache class for PSR-16 compatible "Simple Cache" implementation using session backend.
+ *
+ * @package Grav\Framework\Cache
+ */
+class SessionCache extends AbstractCache
+{
+    const VALUE = 0;
+    const LIFETIME = 1;
+
+    public function doGet($key, $miss)
+    {
+        $stored = $this->doGetStored($key);
+
+        return $stored ? $stored[self::VALUE] : $miss;
+    }
+
+    public function doSet($key, $value, $ttl)
+    {
+        $_SESSION[$this->getNamespace()][$key] = [self::VALUE => $value, self::LIFETIME => time() + $ttl];
+
+        return true;
+    }
+
+    public function doDelete($key)
+    {
+        unset($_SESSION[$this->getNamespace()][$key]);
+
+        return true;
+    }
+
+    public function doClear()
+    {
+        $_SESSION[$this->getNamespace()] = [];
+
+        return true;
+    }
+
+    public function doHas($key)
+    {
+        return $this->doGetStored($key) !== null;
+    }
+
+    public function getNamespace()
+    {
+        return 'cache-' . parent::getNamespace();
+    }
+
+    protected function doGetStored($key)
+    {
+        $stored = isset($_SESSION[$this->getNamespace()][$key]) ? $_SESSION[$this->getNamespace()][$key] : null;
+
+        if ($stored && $stored[self::LIFETIME] < time()) {
+            unset($_SESSION[$this->getNamespace()][$key]);
+            $stored = null;
+        }
+
+        return $stored ?: null;
+    }
+}

system/src/Grav/Framework/Cache/CacheTrait.php

@@ -36,6 +36,7 @@ trait CacheTrait
      *
      * @param string $namespace
      * @param null|int|\DateInterval $defaultLifetime
+     * @throws InvalidArgumentException
      */
     protected function init($namespace = '', $defaultLifetime = null)
     {
@@ -62,6 +63,7 @@ trait CacheTrait
 
     /**
      * @inheritdoc
+     * @throws InvalidArgumentException
      */
     public function get($key, $default = null)
     {
@@ -74,6 +76,7 @@ trait CacheTrait
 
     /**
      * @inheritdoc
+     * @throws InvalidArgumentException
      */
     public function set($key, $value, $ttl = null)
     {
@@ -87,6 +90,7 @@ trait CacheTrait
 
     /**
      * @inheritdoc
+     * @throws InvalidArgumentException
      */
     public function delete($key)
     {
@@ -145,6 +149,7 @@ trait CacheTrait
 
     /**
      * @inheritdoc
+     * @throws InvalidArgumentException
      */
     public function setMultiple($values, $ttl = null)
     {
@@ -175,6 +180,7 @@ trait CacheTrait
 
     /**
      * @inheritdoc
+     * @throws InvalidArgumentException
      */
     public function deleteMultiple($keys)
     {
@@ -200,6 +206,7 @@ trait CacheTrait
 
     /**
      * @inheritdoc
+     * @throws InvalidArgumentException
      */
     public function has($key)
     {
@@ -253,6 +260,7 @@ trait CacheTrait
 
     /**
      * @param string $key
+     * @throws InvalidArgumentException
      */
     protected function validateKey($key)
     {
@@ -290,6 +298,7 @@ trait CacheTrait
      * @param null|int|\DateInterval    $ttl
      * @param bool                      $ignoreDefault  Used internally inside $this->init().
      * @return int|null
+     * @throws InvalidArgumentException
      */
     protected function convertTtl($ttl, $ignoreDefault = false)
     {