1 files changed, 34 insertions, 0 deletions
diff --git a/lib/private/share/helper.php b/lib/private/share/helper.php
index 26bbca81317..0441647df83 100644
--- a/lib/private/share/helper.php
+++ b/lib/private/share/helper.php
@@ -289,4 +289,38 @@ class Helper extends \OC\Share\Constants {
 		$hint = $l->t('Invalid Federated Cloud ID');
 		throw new HintException('Invalid Fededrated Cloud ID', $hint);
 	}
+
+	/**
+	 * check if two federated cloud IDs refer to the same user
+	 *
+	 * @param string $user1
+	 * @param string $server1
+	 * @param string $user2
+	 * @param string $server2
+	 * @return bool true if both users and servers are the same
+	 */
+	public static function isSameUserOnSameServer($user1, $server1, $user2, $server2) {
+		$normalizedServer1 = strtolower(\OC\Share\Share::removeProtocolFromUrl($server1));
+		$normalizedServer2 = strtolower(\OC\Share\Share::removeProtocolFromUrl($server2));
+
+		if (rtrim($normalizedServer1, '/') === rtrim($normalizedServer2, '/')) {
+			// FIXME this should be a method in the user management instead
+			\OCP\Util::emitHook(
+					'\OCA\Files_Sharing\API\Server2Server',
+					'preLoginNameUsedAsUserName',
+					array('uid' => &$user1)
+			);
+			\OCP\Util::emitHook(
+					'\OCA\Files_Sharing\API\Server2Server',
+					'preLoginNameUsedAsUserName',
+					array('uid' => &$user2)
+			);
+
+			if ($user1 === $user2) {
+				return true;
+			}
+		}
+
+		return false;
+	}
 }