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-rw-r--r--lib/private/DB/QueryBuilder/QuoteHelper.php75
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diff --git a/lib/private/DB/QueryBuilder/QuoteHelper.php b/lib/private/DB/QueryBuilder/QuoteHelper.php
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+<?php
+/**
+ * @author Joas Schilling <nickvergessen@owncloud.com>
+ *
+ * @copyright Copyright (c) 2016, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program. If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OC\DB\QueryBuilder;
+
+use OCP\DB\QueryBuilder\ILiteral;
+use OCP\DB\QueryBuilder\IParameter;
+use OCP\DB\QueryBuilder\IQueryFunction;
+
+class QuoteHelper {
+ /**
+ * @param array|string|ILiteral|IParameter|IQueryFunction $strings string, Literal or Parameter
+ * @return array|string
+ */
+ public function quoteColumnNames($strings) {
+ if (!is_array($strings)) {
+ return $this->quoteColumnName($strings);
+ }
+
+ $return = [];
+ foreach ($strings as $string) {
+ $return[] = $this->quoteColumnName($string);
+ }
+
+ return $return;
+ }
+
+ /**
+ * @param string|ILiteral|IParameter|IQueryFunction $string string, Literal or Parameter
+ * @return string
+ */
+ public function quoteColumnName($string) {
+ if ($string instanceof IParameter || $string instanceof ILiteral || $string instanceof IQueryFunction) {
+ return (string) $string;
+ }
+
+ if ($string === null || $string === 'null' || $string === '*') {
+ return $string;
+ }
+
+ if (!is_string($string)) {
+ throw new \InvalidArgumentException('Only strings, Literals and Parameters are allowed');
+ }
+
+ if (substr_count($string, '.')) {
+ list($alias, $columnName) = explode('.', $string, 2);
+
+ if ($columnName === '*') {
+ return $string;
+ }
+
+ return $alias . '.`' . $columnName . '`';
+ }
+
+ return '`' . $string . '`';
+ }
+}