mostly finished with data model refactoring

lib/model/abstract.php

@@ -0,0 +1,156 @@
+<?php
+/**
+ * ZeroBin
+ *
+ * a zero-knowledge paste bin
+ *
+ * @link      http://sebsauvage.net/wiki/doku.php?id=php:zerobin
+ * @copyright 2012 Sébastien SAUVAGE (sebsauvage.net)
+ * @license   http://www.opensource.org/licenses/zlib-license.php The zlib/libpng License
+ * @version   0.21.1
+ */
+
+/**
+ * model_abstract
+ *
+ * Abstract model for ZeroBin objects.
+ */
+abstract class model_abstract
+{
+    /**
+     * Instance ID.
+     *
+     * @access protected
+     * @var string
+     */
+    protected $_id = '';
+
+    /**
+     * Instance data.
+     *
+     * @access protected
+     * @var stdClass
+     */
+    protected $_data;
+
+    /**
+     * Configuration.
+     *
+     * @access protected
+     * @var configuration
+     */
+    protected $_conf;
+
+    /**
+     * Data storage.
+     *
+     * @access protected
+     * @var zerobin_abstract
+     */
+    protected $_store;
+
+    /**
+     * Instance constructor.
+     *
+     * @access public
+     * @param  configuration $configuration
+     * @param  zerobin_abstract $storage
+     * @return void
+     */
+    public function __construct(configuration $configuration, zerobin_abstract $storage)
+    {
+        $this->_conf = $configuration;
+        $this->_store = $storage;
+        $this->_data = new stdClass;
+        $this->_data->meta = new stdClass;
+    }
+
+    /**
+     * Get ID.
+     *
+     * @access public
+     * @return string
+     */
+    public function getId()
+    {
+        return $this->_id;
+    }
+
+    /**
+     * Set ID.
+     *
+     * @access public
+     * @throws Exception
+     * @return void
+     */
+    public function setId($id)
+    {
+        if (!self::isValidId($id)) throw new Exception('Invalid paste ID.', 60);
+        $this->_id = $id;
+    }
+
+    /**
+     * Set data and recalculate ID.
+     *
+     * @access public
+     * @param string $data
+     * @throws Exception
+     * @return void
+     */
+    public function setData($data)
+    {
+        if (!sjcl::isValid($data)) throw new Exception('Invalid data.', 61);
+        $this->_data->data = $data;
+
+        // We just want a small hash to avoid collisions:
+        // Half-MD5 (64 bits) will do the trick
+        $this->setId(substr(hash('md5', $data), 0, 16));
+    }
+
+    /**
+     * Get instance data.
+     *
+     * @access public
+     * @return stdObject
+     */
+    abstract public function get();
+
+    /**
+     * Store the instance's data.
+     *
+     * @access public
+     * @throws Exception
+     * @return void
+     */
+    abstract public function store();
+
+    /**
+     * Delete the current instance.
+     *
+     * @access public
+     * @throws Exception
+     * @return void
+     */
+    abstract public function delete();
+
+    /**
+     * Test if current instance exists in store.
+     *
+     * @access public
+     * @return bool
+     */
+    abstract public function exists();
+
+    /**
+     * Validate ID.
+     *
+     * @access public
+     * @static
+     * @param  string $id
+     * @return bool
+     */
+    public static function isValidId($id)
+    {
+        return (bool) preg_match('#\A[a-f\d]{16}\z#', (string) $id);
+    }
+}