Add FileCache driver

app/Core/Cache/Base.php

@@ -1,38 +0,0 @@
-<?php
-
-namespace Kanboard\Core\Cache;
-
-/**
- * Base class for cache drivers
- *
- * @package  cache
- * @author   Frederic Guillot
- */
-abstract class Base
-{
-    /**
-     * Proxy cache
-     *
-     * Note: Arguments must be scalar types
-     *
-     * @access public
-     * @param  string    $class        Class instance
-     * @param  string    $method       Container method
-     * @return mixed
-     */
-    public function proxy($class, $method)
-    {
-        $args = func_get_args();
-        array_shift($args);
-
-        $key = 'proxy:'.get_class($class).':'.implode(':', $args);
-        $result = $this->get($key);
-
-        if ($result === null) {
-            $result = call_user_func_array(array($class, $method), array_splice($args, 1));
-            $this->set($key, $result);
-        }
-
-        return $result;
-    }
-}

app/Core/Cache/BaseCache.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace Kanboard\Core\Cache;
+
+/**
+ * Base Class for Cache Drivers
+ *
+ * @package  Kanboard\Core\Cache
+ * @author   Frederic Guillot
+ */
+abstract class BaseCache
+{
+    /**
+     * Store an item in the cache
+     *
+     * @access public
+     * @param  string  $key
+     * @param  string  $value
+     */
+    abstract public function set($key, $value);
+
+    /**
+     * Retrieve an item from the cache by key
+     *
+     * @access public
+     * @param  string  $key
+     * @return mixed            Null when not found, cached value otherwise
+     */
+    abstract public function get($key);
+
+    /**
+     * Remove all items from the cache
+     *
+     * @access public
+     */
+    abstract public function flush();
+
+    /**
+     * Remove an item from the cache
+     *
+     * @access public
+     * @param  string  $key
+     */
+    abstract public function remove($key);
+
+    /**
+     * Proxy cache
+     *
+     * Note: Arguments must be scalar types
+     *
+     * @access public
+     * @param  string    $class        Class instance
+     * @param  string    $method       Container method
+     * @return mixed
+     */
+    public function proxy($class, $method)
+    {
+        $args = func_get_args();
+        array_shift($args);
+
+        $key = 'proxy:'.get_class($class).':'.implode(':', $args);
+        $result = $this->get($key);
+
+        if ($result === null) {
+            $result = call_user_func_array(array($class, $method), array_splice($args, 1));
+            $this->set($key, $result);
+        }
+
+        return $result;
+    }
+}

app/Core/Cache/CacheInterface.php

@@ -1,45 +0,0 @@
-<?php
-
-namespace Kanboard\Core\Cache;
-
-/**
- * Cache Interface
- *
- * @package  cache
- * @author   Frederic Guillot
- */
-interface CacheInterface
-{
-    /**
-     * Save a new value in the cache
-     *
-     * @access public
-     * @param  string  $key
-     * @param  string  $value
-     */
-    public function set($key, $value);
-
-    /**
-     * Fetch value from cache
-     *
-     * @access public
-     * @param  string  $key
-     * @return mixed            Null when not found, cached value otherwise
-     */
-    public function get($key);
-
-    /**
-     * Clear all cache
-     *
-     * @access public
-     */
-    public function flush();
-
-    /**
-     * Remove cached value
-     *
-     * @access public
-     * @param  string  $key
-     */
-    public function remove($key);
-}

app/Core/Cache/FileCache.php

@@ -0,0 +1,98 @@
+<?php
+
+namespace Kanboard\Core\Cache;
+
+use Kanboard\Core\Tool;
+use LogicException;
+
+/**
+ * Class FileCache
+ *
+ * @package Kanboard\Core\Cache
+ */
+class FileCache extends BaseCache
+{
+    /**
+     * Store an item in the cache
+     *
+     * @access public
+     * @param  string $key
+     * @param  string $value
+     */
+    public function set($key, $value)
+    {
+        $this->createCacheFolder();
+        file_put_contents($this->getFilenameFromKey($key), serialize($value));
+    }
+
+    /**
+     * Retrieve an item from the cache by key
+     *
+     * @access public
+     * @param  string $key
+     * @return mixed            Null when not found, cached value otherwise
+     */
+    public function get($key)
+    {
+        $filename = $this->getFilenameFromKey($key);
+
+        if (file_exists($filename)) {
+            return unserialize(file_get_contents($filename));
+        }
+
+        return null;
+    }
+
+    /**
+     * Remove all items from the cache
+     *
+     * @access public
+     */
+    public function flush()
+    {
+        $this->createCacheFolder();
+        Tool::removeAllFiles(CACHE_DIR, false);
+    }
+
+    /**
+     * Remove an item from the cache
+     *
+     * @access public
+     * @param  string $key
+     */
+    public function remove($key)
+    {
+        $filename = $this->getFilenameFromKey($key);
+
+        if (file_exists($filename)) {
+            unlink($filename);
+        }
+    }
+
+    /**
+     * Get absolute filename from the key
+     *
+     * @access protected
+     * @param  string $key
+     * @return string
+     */
+    protected function getFilenameFromKey($key)
+    {
+        return CACHE_DIR.DIRECTORY_SEPARATOR.$key;
+    }
+
+    /**
+     * Create cache folder if missing
+     *
+     * @access protected
+     * @throws LogicException
+     */
+    protected function createCacheFolder()
+    {
+        if (! is_dir(CACHE_DIR)) {
+            if (! mkdir(CACHE_DIR, 0755)) {
+                throw new LogicException('Unable to create cache directory: '.CACHE_DIR);
+            }
+        }
+    }
+}

app/Core/Cache/MemoryCache.php

@@ -3,12 +3,12 @@
 namespace Kanboard\Core\Cache;
 
 /**
- * Memory Cache
+ * Memory Cache Driver
  *
- * @package  cache
+ * @package  Kanboard\Core\Cache
  * @author   Frederic Guillot
  */
-class MemoryCache extends Base implements CacheInterface
+class MemoryCache extends BaseCache
 {
     /**
      * Container
@@ -19,7 +19,7 @@ class MemoryCache extends Base implements CacheInterface
     private $storage = array();
 
     /**
-     * Save a new value in the cache
+     * Store an item in the cache
      *
      * @access public
      * @param  string  $key
@@ -31,7 +31,7 @@ class MemoryCache extends Base implements CacheInterface
     }
 
     /**
-     * Fetch value from cache
+     * Retrieve an item from the cache by key
      *
      * @access public
      * @param  string  $key