Refactoring of code base - modularized code, introduced configuration, started working on a PDO based DB connector

lib/zerobin_db.php

@@ -0,0 +1,176 @@
+<?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   0.15
+ */
+
+/**
+ * zerobin_db
+ *
+ * Model for DB access, implemented as a singleton.
+ */
+class zerobin_db
+{
+    /*
+     * @access private
+     * @static
+     * @var PDO instance of database connection
+     */
+    private static $_db;
+
+	/**
+     * singleton instance
+     *
+     * @access private
+     * @static
+     * @var zerobin
+     */
+    private static $_instance = null;
+
+    /**
+     * enforce singleton, disable constructor
+     *
+     * Instantiate using {@link getInstance()}, zerobin is a singleton object.
+     *
+     * @access protected
+     */
+    protected function __construct() {}
+
+    /**
+     * enforce singleton, disable cloning
+     *
+     * Instantiate using {@link getInstance()}, zerobin is a singleton object.
+     *
+     * @access private
+     */
+    private function __clone() {}
+
+    /**
+     * get instance of singleton
+     *
+     * @access public
+     * @static
+     * @return zerobin
+     */
+    public static function getInstance($options)
+    {
+        // if needed initialize the singleton
+        if(null === self::$_instance) {
+            self::$_instance = new self;
+            self::_init();
+        }
+        if (
+        	is_array($options) &&
+        	array_key_exists('dsn', $options) &&
+        	array_key_exists('usr', $options) &&
+        	array_key_exists('pwd', $options) &&
+        	array_key_exists('opt', $options)
+        ) self::$_db = new PDO(
+            $options['dsn'],
+            $options['usr'],
+            $options['pwd'],
+            $options['opt']
+        );
+        return self::$_instance;
+    }
+
+    /**
+     * Create a paste.
+     *
+     * @access public
+     * @param  string $pasteid
+     * @param  array  $paste
+     * @return int|false
+     */
+    public function create($pasteid, $paste)
+    {
+    }
+
+    /**
+     * Read a paste.
+     *
+     * @access public
+     * @param  string $pasteid
+     * @return string
+     */
+    public function read($pasteid)
+    {
+    }
+
+    /**
+     * Delete a paste and its discussion.
+     *
+     * @access public
+     * @param  string $pasteid
+     * @return void
+     */
+    public function delete($pasteid)
+    {
+    }
+
+    /**
+     * Test if a paste exists.
+     *
+     * @access public
+     * @param  string $dataid
+     * @return void
+     */
+    public function exists($pasteid)
+    {
+    }
+
+    /**
+     * Create a comment in a paste.
+     *
+     * @access public
+     * @param  string $pasteid
+     * @param  string $parentid
+     * @param  string $commentid
+     * @param  array  $comment
+     * @return int|false
+     */
+    public function createComment($pasteid, $parentid, $commentid, $comment)
+    {
+    }
+
+    /**
+     * Read all comments of paste.
+     *
+     * @access public
+     * @param  string $pasteid
+     * @return array
+     */
+    public function readComments($pasteid)
+    {
+    }
+
+    /**
+     * Test if a comment exists.
+     *
+     * @access public
+     * @param  string $dataid
+     * @param  string $parentid
+     * @param  string $commentid
+     * @return void
+     */
+    public function existsComment($pasteid, $parentid, $commentid)
+    {
+    }
+
+    /**
+     * initialize zerobin
+     *
+     * @access private
+     * @static
+     * @return void
+     */
+    private static function _init()
+    {
+    }
+}