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<?php
/**
* Joomla! Content Management System
*
* @copyright (C) 2013 Open Source Matters, Inc. <https://www.joomla.org>
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
namespace Joomla\CMS\Table;
\defined('JPATH_PLATFORM') or die;
use Joomla\CMS\Factory;
use Joomla\Database\DatabaseDriver;
use Joomla\Database\ParameterType;
/**
* Content History table.
*
* @since 3.2
*/
class ContentHistory extends Table
{
/**
* Array of object fields to unset from the data object before calculating SHA1 hash. This allows us to detect a meaningful change
* in the database row using the hash. This can be read from the #__content_types content_history_options column.
*
* @var array
* @since 3.2
*/
public $ignoreChanges = array();
/**
* Array of object fields to convert to integers before calculating SHA1 hash. Some values are stored differently
* when an item is created than when the item is changed and saved. This works around that issue.
* This can be read from the #__content_types content_history_options column.
*
* @var array
* @since 3.2
*/
public $convertToInt = array();
/**
* Constructor
*
* @param DatabaseDriver $db A database connector object
*
* @since 3.1
*/
public function __construct(DatabaseDriver $db)
{
parent::__construct('#__history', 'version_id', $db);
$this->ignoreChanges = array(
'modified_by',
'modified_user_id',
'modified',
'modified_time',
'checked_out',
'checked_out_time',
'version',
'hits',
'path',
);
$this->convertToInt = array('publish_up', 'publish_down', 'ordering', 'featured');
}
/**
* Overrides Table::store to set modified hash, user id, and save date.
*
* @param boolean $updateNulls True to update fields even if they are null.
*
* @return boolean True on success.
*
* @since 3.2
*/
public function store($updateNulls = false)
{
$this->set('character_count', \strlen($this->get('version_data')));
$typeTable = Table::getInstance('ContentType', 'JTable', array('dbo' => $this->getDbo()));
$typeAlias = explode('.', $this->item_id);
array_pop($typeAlias);
$typeTable->load(array('type_alias' => implode('.', $typeAlias)));
if (!isset($this->sha1_hash))
{
$this->set('sha1_hash', $this->getSha1($this->get('version_data'), $typeTable));
}
// Modify author and date only when not toggling Keep Forever
if ($this->get('keep_forever') === null)
{
$this->set('editor_user_id', Factory::getUser()->id);
$this->set('save_date', Factory::getDate()->toSql());
}
return parent::store($updateNulls);
}
/**
* Utility method to get the hash after removing selected values. This lets us detect changes other than
* modified date (which will change on every save).
*
* @param mixed $jsonData Either an object or a string with json-encoded data
* @param ContentType $typeTable Table object with data for this content type
*
* @return string SHA1 hash on success. Empty string on failure.
*
* @since 3.2
*/
public function getSha1($jsonData, ContentType $typeTable)
{
$object = \is_object($jsonData) ? $jsonData : json_decode($jsonData);
if (isset($typeTable->content_history_options) && \is_object(json_decode($typeTable->content_history_options)))
{
$options = json_decode($typeTable->content_history_options);
$this->ignoreChanges = $options->ignoreChanges ?? $this->ignoreChanges;
$this->convertToInt = $options->convertToInt ?? $this->convertToInt;
}
foreach ($this->ignoreChanges as $remove)
{
if (property_exists($object, $remove))
{
unset($object->$remove);
}
}
// Convert integers, booleans, and nulls to strings to get a consistent hash value
foreach ($object as $name => $value)
{
if (\is_object($value))
{
// Go one level down for JSON column values
foreach ($value as $subName => $subValue)
{
$object->$subName = \is_int($subValue) || \is_bool($subValue) || $subValue === null ? (string) $subValue : $subValue;
}
}
else
{
$object->$name = \is_int($value) || \is_bool($value) || $value === null ? (string) $value : $value;
}
}
// Work around empty values
foreach ($this->convertToInt as $convert)
{
if (isset($object->$convert))
{
$object->$convert = (int) $object->$convert;
}
}
if (isset($object->review_time))
{
$object->review_time = (int) $object->review_time;
}
return sha1(json_encode($object));
}
/**
* Utility method to get a matching row based on the hash value and id columns.
* This lets us check to make sure we don't save duplicate versions.
*
* @return string SHA1 hash on success. Empty string on failure.
*
* @since 3.2
*/
public function getHashMatch()
{
$db = $this->_db;
$itemId = $this->get('item_id');
$sha1Hash = $this->get('sha1_hash');
$query = $db->getQuery(true);
$query->select('*')
->from($db->quoteName('#__history'))
->where($db->quoteName('item_id') . ' = :item_id')
->where($db->quoteName('sha1_hash') . ' = :sha1_hash')
->bind(':item_id', $itemId, ParameterType::STRING)
->bind(':sha1_hash', $sha1Hash);
$query->setLimit(1);
$db->setQuery($query);
return $db->loadObject();
}
/**
* Utility method to remove the oldest versions of an item, saving only the most recent versions.
*
* @param integer $maxVersions The maximum number of versions to save. All others will be deleted.
*
* @return boolean true on success, false on failure.
*
* @since 3.2
*/
public function deleteOldVersions($maxVersions)
{
$result = true;
// Get the list of version_id values we want to save
$db = $this->_db;
$itemId = $this->get('item_id');
$query = $db->getQuery(true);
$query->select($db->quoteName('version_id'))
->from($db->quoteName('#__history'))
->where($db->quoteName('item_id') . ' = :item_id')
->where($db->quoteName('keep_forever') . ' != 1')
->bind(':item_id', $itemId, ParameterType::STRING)
->order($db->quoteName('save_date') . ' DESC ');
$query->setLimit((int) $maxVersions);
$db->setQuery($query);
$idsToSave = $db->loadColumn(0);
// Don't process delete query unless we have at least the maximum allowed versions
if (\count($idsToSave) === (int) $maxVersions)
{
// Delete any rows not in our list and and not flagged to keep forever.
$query = $db->getQuery(true);
$query->delete($db->quoteName('#__history'))
->where($db->quoteName('item_id') . ' = :item_id')
->whereNotIn($db->quoteName('version_id'), $idsToSave)
->where($db->quoteName('keep_forever') . ' != 1')
->bind(':item_id', $itemId, ParameterType::STRING);
$db->setQuery($query);
$result = (boolean) $db->execute();
}
return $result;
}
}