4 files changed, 113 insertions, 15 deletions
diff --git a/app/Core/Cache/Base.php b/app/Core/Cache/BaseCache.php
index d62b8507..b51c4c0c 100644
--- a/app/Core/Cache/Base.php
+++ b/app/Core/Cache/BaseCache.php
@@ -3,12 +3,12 @@
 namespace Kanboard\Core\Cache;
 
 /**
- * Base class for cache drivers
+ * Base Class for Cache Drivers
  *
- * @package  cache
+ * @package  Kanboard\Core\Cache
  * @author   Frederic Guillot
  */
-abstract class Base
+abstract class BaseCache implements CacheInterface
 {
     /**
      * Proxy cache
diff --git a/app/Core/Cache/CacheInterface.php b/app/Core/Cache/CacheInterface.php
index d9e9747a..19bd6ef7 100644
--- a/app/Core/Cache/CacheInterface.php
+++ b/app/Core/Cache/CacheInterface.php
@@ -3,15 +3,15 @@
 namespace Kanboard\Core\Cache;
 
 /**
- * Cache Interface
+ * Interface CacheInterface
  *
- * @package  cache
- * @author   Frederic Guillot
+ * @package Kanboard\Core\Cache
+ * @author  Frederic Guillot
  */
 interface CacheInterface
 {
     /**
-     * Save a new value in the cache
+     * Store an item in the cache
      *
      * @access public
      * @param  string  $key
@@ -20,7 +20,7 @@ interface CacheInterface
     public function set($key, $value);
 
     /**
-     * Fetch value from cache
+     * Retrieve an item from the cache by key
      *
      * @access public
      * @param  string  $key
@@ -29,14 +29,14 @@ interface CacheInterface
     public function get($key);
 
     /**
-     * Clear all cache
+     * Remove all items from the cache
      *
      * @access public
      */
     public function flush();
 
     /**
-     * Remove cached value
+     * Remove an item from the cache
      *
      * @access public
      * @param  string  $key
diff --git a/app/Core/Cache/FileCache.php b/app/Core/Cache/FileCache.php
new file mode 100644
index 00000000..d477a1f3
--- /dev/null
+++ b/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);
+            }
+        }
+    }
+}
diff --git a/app/Core/Cache/MemoryCache.php b/app/Core/Cache/MemoryCache.php
index 39e3947b..4fb94728 100644
--- a/app/Core/Cache/MemoryCache.php
+++ b/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