add backup panel

var/Widget/Backup.php

@@ -0,0 +1,104 @@
+<?php
+if (!defined('__TYPECHO_ROOT_DIR__')) exit;
+/**
+ * Typecho Blog Platform
+ *
+ * @copyright  Copyright (c) 2008 Typecho team (http://www.typecho.org)
+ * @license    GNU General Public License 2.0
+ */
+
+/**
+ * 备份工具
+ *
+ * @package Widget
+ */
+class Widget_Backup extends Widget_Abstract_Options implements Widget_Interface_Do
+{
+    /**
+     * @var array
+     */
+    private $_types = [
+        'contents'          =>  1,
+        'comments'          =>  2,
+        'metas'             =>  3,
+        'relationships'     =>  4,
+        'users'             =>  5,
+        'fields'            =>  6
+    ];
+
+    /**
+     * @param $type
+     * @param $data
+     * @return string
+     */
+    private function buildBuffer($type, $data)
+    {
+        $buffer = '';
+        $body = '';
+
+        $schema = [];
+        foreach ($data as $key => $val) {
+            $schema[$key] = strlen($val);
+            $body .= $val;
+        }
+        $schemaHeader = json_encode($schema);
+
+        $buffer .= pack('C', $type);     // 写入类型
+        $buffer .= pack('v', strlen($schemaHeader));    // 写入头
+        $buffer .= $schemaHeader . $body;
+
+        return $buffer;
+    }
+
+    /**
+     * 导出数据
+     */
+    private function export()
+    {
+        $host = parse_url($this->options->siteUrl, PHP_URL_HOST);
+        $this->response->setContentType('application/octet-stream');
+        $this->response->setHeader('Content-Disposition', 'attachment; filename="'
+            . date('Ymd') . '_' . $host . '_' . uniqid() . '.dat"');
+
+        $buffer = '';
+        $db = Typecho_Db::get();
+
+        foreach ($this->_types as $type => $val) {
+            $page = 1;
+            do {
+                $rows = $db->fetchAll($db->select()->from('table.' . $type)->page($page, 20));
+                $page ++;
+
+                foreach ($rows as $row) {
+                    $buffer .= $this->buildBuffer($val, $row);
+
+                    if (sizeof($buffer) >= 1024 * 1024) {
+                        echo $buffer;
+                        ob_flush();
+                        $buffer = '';
+                    }
+                }
+            } while (count($rows) == 20);
+        }
+
+        if (!empty($buffer)) {
+            echo $buffer;
+            ob_flush();
+        }
+
+        Typecho_Plugin::factory(__CLASS__)->export();
+    }
+
+    /**
+     * 绑定动作
+     */
+    public function action()
+    {
+        $this->user->pass('administrator');
+        $this->security->protect();
+
+        $this->on($this->request->is('do=export'))->export();
+        $this->on($this->request->is('do=import'))->import();
+    }
+
+}

var/Widget/Do.php

@@ -43,7 +43,8 @@ class Widget_Do extends Typecho_Widget
         'plugins-edit'              =>  'Widget_Plugins_Edit',
         'themes-edit'               =>  'Widget_Themes_Edit',
         'users-edit'                =>  'Widget_Users_Edit',
-        'users-profile'             =>  'Widget_Users_Profile'
+        'users-profile'             =>  'Widget_Users_Profile',
+        'backup'                    =>  'Widget_Backup'
     );
 
     /**

var/Widget/Menu.php

@@ -116,6 +116,7 @@ class Widget_Menu extends Typecho_Widget
             array(_t('外观'), _t('网站外观'), 'themes.php', 'administrator'),
             array(array('Widget_Themes_Files', 'getMenuTitle'), array('Widget_Themes_Files', 'getMenuTitle'), 'theme-editor.php', 'administrator', true),
             array(_t('设置外观'), _t('设置外观'), 'options-theme.php', 'administrator', true),
+            array(_t('备份'), _t('备份'), 'backup.php', 'administrator'),
             array(_t('升级'), _t('升级程序'), 'upgrade.php', 'administrator', true),
             array(_t('欢迎'), _t('欢迎使用'), 'welcome.php', 'subscriber', true)
         ),