Merge remote-tracking branch 'github-marc1706/ticket/13263' into prep…

…-release-3.1.1

* github-marc1706/ticket/13263:
  [ticket/13263] Make sure default style exists and clean up code
  [ticket/13263] Only install/set prosilver if no style available
  [ticket/13263] Use prosilver as default style if user's style doesn't exist

phpBB/phpbb/db/migration/data/v31x/style_update.php

@@ -0,0 +1,136 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\db\migration\data\v31x;
+
+class style_update extends \phpbb\db\migration\migration
+{
+	static public function depends_on()
+	{
+		return array('\phpbb\db\migration\data\v310\gold');
+	}
+
+	public function update_data()
+	{
+		return array(
+			array('custom', array(array($this, 'update_installed_styles'))),
+		);
+	}
+
+	public function update_installed_styles()
+	{
+		// Get all currently available styles
+		$styles = $this->find_style_dirs();
+		$style_paths = $style_ids = array();
+
+		$sql = 'SELECT style_path, style_id
+				FROM ' . $this->table_prefix . 'styles';
+		$result = $this->db->sql_query($sql);
+		while ($styles_row = $this->db->sql_fetchrow())
+		{
+			if (in_array($styles_row['style_path'], $styles))
+			{
+				$style_paths[] = $styles_row['style_path'];
+				$style_ids[] = $styles_row['style_id'];
+			}
+		}
+		$this->db->sql_freeresult($result);
+
+		// Install prosilver if no style is available and prosilver can be installed
+		if (empty($style_paths) && in_array('prosilver', $styles))
+		{
+			// Try to parse config file
+			$cfg = parse_cfg_file($this->phpbb_root_path . 'styles/prosilver/style.cfg');
+
+			// Stop running this if prosilver cfg file can't be read
+			if (empty($cfg))
+			{
+				throw new \RuntimeException('No styles available and could not fall back to prosilver.');
+			}
+
+			$style = array(
+				'style_name'		=> 'prosilver',
+				'style_copyright'	=> '&copy; phpBB Limited',
+				'style_active'		=> 1,
+				'style_path'		=> 'prosilver',
+				'bbcode_bitfield'	=> 'kNg=',
+				'style_parent_id'	=> 0,
+				'style_parent_tree'	=> '',
+			);
+
+			// Add to database
+			$this->db->sql_transaction('begin');
+
+			$sql = 'INSERT INTO ' . $this->table_prefix . 'styles
+					' . $this->db->sql_build_array('INSERT', $style);
+			$this->db->sql_query($sql);
+
+			$style_id = $this->db->sql_nextid();
+			$style_ids[] = $style_id;
+
+			$this->db->sql_transaction('commit');
+
+			// Set prosilver to default style
+			$this->config->set('default_style', $style_id);
+		}
+		else if (empty($styles) && empty($available_styles))
+		{
+			throw new \RuntimeException('No valid styles available');
+		}
+
+		// Make sure default style is available
+		if (!in_array($this->config['default_style'], $style_ids))
+		{
+			$this->config->set('default_style', array_pop($style_ids));
+		}
+
+		// Reset users to default style if their user_style is nonexistent
+		$sql = 'UPDATE ' . $this->table_prefix . "users
+			SET user_style = {$this->config['default_style']}
+			WHERE " . $this->db->sql_in_set('user_style', $style_ids, true, true);
+		$this->db->sql_query($sql);
+	}
+
+	/**
+	 * Find all directories that have styles
+	 * Copied from acp_styles
+	 *
+	 * @return array Directory names
+	 */
+	protected function find_style_dirs()
+	{
+		$styles = array();
+		$styles_path = $this->phpbb_root_path . 'styles/';
+
+		$dp = @opendir($styles_path);
+		if ($dp)
+		{
+			while (($file = readdir($dp)) !== false)
+			{
+				$dir = $styles_path . $file;
+				if ($file[0] == '.' || !is_dir($dir))
+				{
+					continue;
+				}
+
+				if (file_exists("{$dir}/style.cfg"))
+				{
+					$styles[] = $file;
+				}
+			}
+			closedir($dp);
+		}
+
+		return $styles;
+	}
+}