allow getting acls of files

src/ACL.php

@@ -0,0 +1,81 @@
+<?php declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2020 Robin Appelman <robin@icewind.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * 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
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace Icewind\SMB;
+
+class ACL {
+	const TYPE_ALLOW = 0;
+	const TYPE_DENY = 1;
+
+	const MASK_READ = 0x0001;
+	const MASK_WRITE = 0x0002;
+	const MASK_EXECUTE = 0x00020;
+	const MASK_DELETE = 0x10000;
+
+	const FLAG_OBJECT_INHERIT = 0x1;
+	const FLAG_CONTAINER_INHERIT = 0x2;
+
+	private $type;
+	private $flags;
+	private $mask;
+
+	public function __construct(int $type, int $flags, int $mask) {
+		$this->type = $type;
+		$this->flags = $flags;
+		$this->mask = $mask;
+	}
+
+	/**
+	 * Check if the acl allows a specific permissions
+	 *
+	 * Note that this does not take inherited acls into account
+	 *
+	 * @param int $mask one of the ACL::MASK_* constants
+	 * @return bool
+	 */
+	public function allows(int $mask): bool {
+		return $this->type === self::TYPE_ALLOW && ($this->mask & $mask) === $mask;
+	}
+
+	/**
+	 * Check if the acl allows a specific permissions
+	 *
+	 * Note that this does not take inherited acls into account
+	 *
+	 * @param int $mask one of the ACL::MASK_* constants
+	 * @return bool
+	 */
+	public function denies(int $mask): bool {
+		return $this->type === self::TYPE_DENY && ($this->mask & $mask) === $mask;
+	}
+
+	public function getType(): int {
+		return $this->type;
+	}
+
+	public function getFlags(): int {
+		return $this->flags;
+	}
+
+	public function getMask(): int {
+		return $this->mask;
+	}
+}