<?php
/*
 * @copyright   Copyright (C) 2010-2024 Combodo SAS
 * @license     http://opensource.org/licenses/AGPL-3.0
 */

namespace Combodo\iTop\Core\AttributeDefinition;

use CMDBChangeOp;
use CMDBChangeOpSetAttributeEncrypted;
use DBObject;
use MetaModel;
use SimpleCrypt;

/**
 * Map a text column (size < 255) to an attribute that is encrypted in the database
 * The encryption is based on a key set per iTop instance. Thus if you export your
 * database (in SQL) to someone else without providing the key at the same time
 * the encrypted fields will remain encrypted
 *
 * @package     iTopORM
 */
class AttributeEncryptedString extends AttributeString implements iAttributeNoGroupBy
{
	const SEARCH_WIDGET_TYPE = self::SEARCH_WIDGET_TYPE_RAW;

	protected function GetSQLCol($bFullSpec = false)
	{
		return "TINYBLOB";
	}

	public function GetMaxSize()
	{
		return 255;
	}

	public function MakeRealValue($proposedValue, $oHostObj)
	{
		if (is_null($proposedValue)) {
			return null;
		}

		return (string)$proposedValue;
	}

	/**
	 * Decrypt the value when reading from the database
	 *
	 * @param array $aCols
	 * @param string $sPrefix
	 *
	 * @return string
	 * @throws Exception
	 */
	public function FromSQLToValue($aCols, $sPrefix = '')
	{
		$oSimpleCrypt = new SimpleCrypt(MetaModel::GetConfig()->GetEncryptionLibrary());
		$sValue = $oSimpleCrypt->Decrypt(MetaModel::GetConfig()->GetEncryptionKey(), $aCols[$sPrefix]);

		return $sValue;
	}

	/**
	 * Encrypt the value before storing it in the database
	 *
	 * @param $value
	 *
	 * @return array
	 * @throws Exception
	 */
	public function GetSQLValues($value)
	{
		$oSimpleCrypt = new SimpleCrypt(MetaModel::GetConfig()->GetEncryptionLibrary());
		$encryptedValue = $oSimpleCrypt->Encrypt(MetaModel::GetConfig()->GetEncryptionKey(), $value);

		$aValues = array();
		$aValues[$this->Get("sql")] = $encryptedValue;

		return $aValues;
	}

	protected function GetChangeRecordAdditionalData(CMDBChangeOp $oMyChangeOp, DBObject $oObject, $original, $value): void
	{
		if (is_null($original)) {
			$original = '';
		}
		$oMyChangeOp->Set("prevstring", $original);
	}

	protected function GetChangeRecordClassName(): string
	{
		return CMDBChangeOpSetAttributeEncrypted::class;
	}


}