From 7e5b4b2881a7fc3e797b13aeade2f897dc4ce3d8 Mon Sep 17 00:00:00 2001
From: Nikolai Merinov <nikolai.merinov@member.fsf.org>
Date: Sun, 22 Nov 2020 11:18:20 -0500
Subject: Support unquoted fields in Signature header

Signed-off-by: Nikolai Merinov <nikolai.merinov@member.fsf.org>
---
 lib/Service/SignatureService.php | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/Service/SignatureService.php b/lib/Service/SignatureService.php
index 1c5bd6c8..ba6d2824 100644
--- a/lib/Service/SignatureService.php
+++ b/lib/Service/SignatureService.php
@@ -468,8 +468,9 @@ class SignatureService {
 
 			list($k, $v) = explode('=', $entry, 2);
 			preg_match('/"([^"]+)"/', $v, $varr);
-			$v = trim($varr[0], '"');
-
+			if ($varr[0] !== null) {
+				$v = trim($varr[0], '"');
+			}
 			$sign[$k] = $v;
 		}
 
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