1 files changed, 44 insertions, 0 deletions
diff --git a/apps/user_ldap/lib/Service/BirthdateParserService.php b/apps/user_ldap/lib/Service/BirthdateParserService.php
new file mode 100644
index 00000000000..8234161b3d8
--- /dev/null
+++ b/apps/user_ldap/lib/Service/BirthdateParserService.php
@@ -0,0 +1,44 @@
+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\User_LDAP\Service;
+
+use DateTimeImmutable;
+use Exception;
+use InvalidArgumentException;
+
+class BirthdateParserService {
+	/**
+	 * Try to parse the birthdate from LDAP.
+	 * Supports LDAP's generalized time syntax, YYYYMMDD and YYYY-MM-DD.
+	 *
+	 * @throws InvalidArgumentException If the format of then given date is unknown
+	 */
+	public function parseBirthdate(string $value): DateTimeImmutable {
+		// Minimum LDAP generalized date is "1994121610Z" with 11 chars
+		// While maximum other format is "1994-12-16" with 10 chars
+		if (strlen($value) > strlen('YYYY-MM-DD')) {
+			// Probably LDAP generalized time syntax
+			$value = substr($value, 0, 8);
+		}
+
+		// Should be either YYYYMMDD or YYYY-MM-DD
+		if (!preg_match('/^(\d{8}|\d{4}-\d{2}-\d{2})$/', $value)) {
+			throw new InvalidArgumentException("Unknown date format: $value");
+		}
+
+		try {
+			return new DateTimeImmutable($value);
+		} catch (Exception $e) {
+			throw new InvalidArgumentException(
+				"Unknown date format: $value",
+				0,
+				$e,
+			);
+		}
+	}
+}