1 files changed, 153 insertions, 0 deletions
diff --git a/engine/classes/ElggSession.php b/engine/classes/ElggSession.php
new file mode 100644
index 000000000..9750f063e
--- /dev/null
+++ b/engine/classes/ElggSession.php
@@ -0,0 +1,153 @@
+<?php
+/**
+ * Magic session class.
+ * This class is intended to extend the $_SESSION magic variable by providing an API hook
+ * to plug in other values.
+ *
+ * Primarily this is intended to provide a way of supplying "logged in user"
+ * details without touching the session (which can cause problems when
+ * accessed server side).
+ *
+ * If a value is present in the session then that value is returned, otherwise
+ * a plugin hook 'session:get', '$var' is called, where $var is the variable
+ * being requested.
+ *
+ * Setting values will store variables in the session in the normal way.
+ *
+ * LIMITATIONS: You can not access multidimensional arrays
+ *
+ * @package    Elgg.Core
+ * @subpackage Sessions
+ */
+class ElggSession implements ArrayAccess {
+	/** Local cache of trigger retrieved variables */
+	private static $__localcache;
+
+	/**
+	 * Test if property is set either as an attribute or metadata.
+	 *
+	 * @param string $key The name of the attribute or metadata.
+	 *
+	 * @return bool
+	 */
+	function __isset($key) {
+		return $this->offsetExists($key);
+	}
+
+	/**
+	 * Set a value, go straight to session.
+	 *
+	 * @param string $key   Name
+	 * @param mixed  $value Value
+	 *
+	 * @return void
+	 */
+	function offsetSet($key, $value) {
+		$_SESSION[$key] = $value;
+	}
+
+	/**
+	 * Get a variable from either the session, or if its not in the session
+	 * attempt to get it from an api call.
+	 *
+	 * @see ArrayAccess::offsetGet()
+	 *
+	 * @param mixed $key Name
+	 *
+	 * @return mixed
+	 */
+	function offsetGet($key) {
+		if (!ElggSession::$__localcache) {
+			ElggSession::$__localcache = array();
+		}
+
+		if (isset($_SESSION[$key])) {
+			return $_SESSION[$key];
+		}
+
+		if (isset(ElggSession::$__localcache[$key])) {
+			return ElggSession::$__localcache[$key];
+		}
+
+		$value = NULL;
+		$value = elgg_trigger_plugin_hook('session:get', $key, NULL, $value);
+
+		ElggSession::$__localcache[$key] = $value;
+
+		return ElggSession::$__localcache[$key];
+	}
+
+	/**
+	 * Unset a value from the cache and the session.
+	 *
+	 * @see ArrayAccess::offsetUnset()
+	 *
+	 * @param mixed $key Name
+	 *
+	 * @return void
+	 */
+	function offsetUnset($key) {
+		unset(ElggSession::$__localcache[$key]);
+		unset($_SESSION[$key]);
+	}
+
+	/**
+	 * Return whether the value is set in either the session or the cache.
+	 *
+	 * @see ArrayAccess::offsetExists()
+	 *
+	 * @param int $offset Offset
+	 *
+	 * @return bool
+	 */
+	function offsetExists($offset) {
+		if (isset(ElggSession::$__localcache[$offset])) {
+			return true;
+		}
+
+		if (isset($_SESSION[$offset])) {
+			return true;
+		}
+
+		if ($this->offsetGet($offset)) {
+			return true;
+		}
+
+		return false;
+	}
+
+
+	/**
+	 * Alias to ::offsetGet()
+	 *
+	 * @param string $key Name
+	 *
+	 * @return mixed
+	 */
+	function get($key) {
+		return $this->offsetGet($key);
+	}
+
+	/**
+	 * Alias to ::offsetSet()
+	 *
+	 * @param string $key   Name
+	 * @param mixed  $value Value
+	 *
+	 * @return void
+	 */
+	function set($key, $value) {
+		$this->offsetSet($key, $value);
+	}
+
+	/**
+	 * Alias to offsetUnset()
+	 *
+	 * @param string $key Name
+	 *
+	 * @return void
+	 */
+	function del($key) {
+		$this->offsetUnset($key);
+	}
+}