Added security classes and draft version of ResourceVoter

lib/Security/AffirmativeStrategy.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace OCA\OrganizationFolders\Security;
+
+class AffirmativeStrategy implements \Stringable {
+	private bool $allowIfAllAbstainDecisions;
+
+	public function __construct(bool $allowIfAllAbstainDecisions = false) {
+		$this->allowIfAllAbstainDecisions = $allowIfAllAbstainDecisions;
+	}
+
+	public function decide(\Traversable $results): bool {
+		$deny = 0;
+		foreach ($results as $result) {
+			if (VoterInterface::ACCESS_GRANTED === $result) {
+				return true;
+			}
+
+			if (VoterInterface::ACCESS_DENIED === $result) {
+				++$deny;
+			}
+		}
+
+		if ($deny > 0) {
+			return false;
+		}
+
+		return $this->allowIfAllAbstainDecisions;
+	}
+
+	public function __toString(): string {
+		return 'affirmative';
+	}
+}