1 files changed, 286 insertions, 0 deletions
diff --git a/phpBB/phpbb/version_helper.php b/phpBB/phpbb/version_helper.php
new file mode 100644
index 0000000000..968a57428f
--- /dev/null
+++ b/phpBB/phpbb/version_helper.php
@@ -0,0 +1,286 @@
+<?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;
+
+/**
+ * Class to handle version checking and comparison
+ */
+class version_helper
+{
+	/**
+	 * @var string Host
+	 */
+	protected $host = 'version.phpbb.com';
+
+	/**
+	 * @var string Path to file
+	 */
+	protected $path = '/phpbb';
+
+	/**
+	 * @var string File name
+	 */
+	protected $file = 'versions.json';
+
+	/**
+	 * @var string Current version installed
+	 */
+	protected $current_version;
+
+	/**
+	 * @var null|string Null to not force stability, 'unstable' or 'stable' to
+	 *					force the corresponding stability
+	 */
+	protected $force_stability;
+
+	/** @var \phpbb\cache\service */
+	protected $cache;
+
+	/** @var \phpbb\config\config */
+	protected $config;
+
+	/** @var \phpbb\user */
+	protected $user;
+
+	/**
+	 * Constructor
+	 *
+	 * @param \phpbb\cache\service $cache
+	 * @param \phpbb\config\config $config
+	 * @param \phpbb\user $user
+	 */
+	public function __construct(\phpbb\cache\service $cache, \phpbb\config\config $config, \phpbb\user $user)
+	{
+		$this->cache = $cache;
+		$this->config = $config;
+		$this->user = $user;
+
+		if (defined('PHPBB_QA'))
+		{
+			$this->force_stability = 'unstable';
+		}
+
+		$this->current_version = $this->config['version'];
+	}
+
+	/**
+	 * Set location to the file
+	 *
+	 * @param string $host Host (e.g. version.phpbb.com)
+	 * @param string $path Path to file (e.g. /phpbb)
+	 * @param string $file File name (Default: versions.json)
+	 * @return version_helper
+	 */
+	public function set_file_location($host, $path, $file = 'versions.json')
+	{
+		$this->host = $host;
+		$this->path = $path;
+		$this->file = $file;
+
+		return $this;
+	}
+
+	/**
+	 * Set current version
+	 *
+	 * @param string $version The current version
+	 * @return version_helper
+	 */
+	public function set_current_version($version)
+	{
+		$this->current_version = $version;
+
+		return $this;
+	}
+
+	/**
+	 * Over-ride the stability to force check to include unstable versions
+	 *
+	 * @param null|string Null to not force stability, 'unstable' or 'stable' to
+	 * 						force the corresponding stability
+	 * @return version_helper
+	 */
+	public function force_stability($stability)
+	{
+		$this->force_stability = $stability;
+
+		return $this;
+	}
+
+	/**
+	 * Wrapper for version_compare() that allows using uppercase A and B
+	 * for alpha and beta releases.
+	 *
+	 * See http://www.php.net/manual/en/function.version-compare.php
+	 *
+	 * @param string $version1		First version number
+	 * @param string $version2		Second version number
+	 * @param string $operator		Comparison operator (optional)
+	 *
+	 * @return mixed				Boolean (true, false) if comparison operator is specified.
+	 *								Integer (-1, 0, 1) otherwise.
+	 */
+	public function compare($version1, $version2, $operator = null)
+	{
+		return phpbb_version_compare($version1, $version2, $operator);
+	}
+
+	/**
+	 * Check whether or not a version is "stable"
+	 *
+	 * Stable means only numbers OR a pl release
+	 *
+	 * @param string $version
+	 * @return bool Bool true or false
+	 */
+	public function is_stable($version)
+	{
+		$matches = false;
+		preg_match('/^[\d\.]+/', $version, $matches);
+
+		if (empty($matches[0]))
+		{
+			return false;
+		}
+
+		return $this->compare($version, $matches[0], '>=');
+	}
+
+	/**
+	* Gets the latest version for the current branch the user is on
+	*
+	* @param bool $force_update Ignores cached data. Defaults to false.
+	* @param bool $force_cache Force the use of the cache. Override $force_update.
+	* @return string
+	* @throws \RuntimeException
+	*/
+	public function get_latest_on_current_branch($force_update = false, $force_cache = false)
+	{
+		$versions = $this->get_versions_matching_stability($force_update, $force_cache);
+
+		$self = $this;
+		$current_version = $this->current_version;
+
+		// Filter out any versions less than to the current version
+		$versions = array_filter($versions, function($data) use ($self, $current_version) {
+			return $self->compare($data['current'], $current_version, '>=');
+		});
+
+		// Get the lowest version from the previous list.
+		return array_reduce($versions, function($value, $data) use ($self) {
+			if ($value === null || $self->compare($data['current'], $value, '<'))
+			{
+				return $data['current'];
+			}
+
+			return $value;
+		});
+	}
+
+	/**
+	* Obtains the latest version information
+	*
+	* @param bool $force_update Ignores cached data. Defaults to false.
+	* @param bool $force_cache Force the use of the cache. Override $force_update.
+	* @return string
+	* @throws \RuntimeException
+	*/
+	public function get_suggested_updates($force_update = false, $force_cache = false)
+	{
+		$versions = $this->get_versions_matching_stability($force_update, $force_cache);
+
+		$self = $this;
+		$current_version = $this->current_version;
+
+		// Filter out any versions less than or equal to the current version
+		return array_filter($versions, function($data) use ($self, $current_version) {
+			return $self->compare($data['current'], $current_version, '>');
+		});
+	}
+
+	/**
+	* Obtains the latest version information matching the stability of the current install
+	*
+	* @param bool $force_update Ignores cached data. Defaults to false.
+	* @param bool $force_cache Force the use of the cache. Override $force_update.
+	* @return string Version info
+	* @throws \RuntimeException
+	*/
+	public function get_versions_matching_stability($force_update = false, $force_cache = false)
+	{
+		$info = $this->get_versions($force_update, $force_cache);
+
+		if ($this->force_stability !== null)
+		{
+			return ($this->force_stability === 'unstable') ? $info['unstable'] : $info['stable'];
+		}
+
+		return ($this->is_stable($this->current_version)) ? $info['stable'] : $info['unstable'];
+	}
+
+	/**
+	* Obtains the latest version information
+	*
+	* @param bool $force_update Ignores cached data. Defaults to false.
+	* @param bool $force_cache Force the use of the cache. Override $force_update.
+	* @return string Version info, includes stable and unstable data
+	* @throws \RuntimeException
+	*/
+	public function get_versions($force_update = false, $force_cache = false)
+	{
+		$cache_file = 'versioncheck_' . $this->host . $this->path . $this->file;
+
+		$info = $this->cache->get($cache_file);
+
+		if ($info === false && $force_cache)
+		{
+			throw new \RuntimeException($this->user->lang('VERSIONCHECK_FAIL'));
+		}
+		else if ($info === false || $force_update)
+		{
+			$errstr = $errno = '';
+			$info = get_remote_file($this->host, $this->path, $this->file, $errstr, $errno);
+
+			if (!empty($errstr))
+			{
+				throw new \RuntimeException($errstr);
+			}
+
+			$info = json_decode($info, true);
+
+			if (empty($info['stable']) && empty($info['unstable']))
+			{
+				$this->user->add_lang('acp/common');
+
+				throw new \RuntimeException($this->user->lang('VERSIONCHECK_FAIL'));
+			}
+
+			// Replace & with &amp; on announcement links
+			foreach ($info as $stability => $branches)
+			{
+				foreach ($branches as $branch => $branch_data)
+				{
+					$info[$stability][$branch]['announcement'] = str_replace('&', '&amp;', $branch_data['announcement']);
+				}
+			}
+
+			$info['stable'] = (empty($info['stable'])) ? array() : $info['stable'];
+			$info['unstable'] = (empty($info['unstable'])) ? $info['stable'] : $info['unstable'];
+
+			$this->cache->put($cache_file, $info, 86400); // 24 hours
+		}
+
+		return $info;
+	}
+}