From 32688d34b633ab7a072198a81f0bca2988407409 Mon Sep 17 00:00:00 2001
From: Hypolite Petovan <hypolite@mrpetovan.com>
Date: Sun, 7 May 2023 00:00:55 -0400
Subject: [PATCH] Ensure $atomns is always set in Protocol\Feed

- Address https://github.com/friendica/friendica/issues/13025#issuecomment-1537162173
---
 src/Protocol/Feed.php | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/src/Protocol/Feed.php b/src/Protocol/Feed.php
index 8c6b4c28d..a43124c69 100644
--- a/src/Protocol/Feed.php
+++ b/src/Protocol/Feed.php
@@ -103,7 +103,7 @@ class Feed
 		$xpath->registerNamespace('poco', ActivityNamespace::POCO);
 
 		$author = [];
-		$atomns = '';
+		$atomns = 'atom';
 		$entries = null;
 		$protocol = Conversation::PARCEL_UNKNOWN;
 
@@ -128,13 +128,12 @@ class Feed
 		// Is it Atom?
 		if ($xpath->query('/atom:feed')->length > 0) {
 			$protocol = Conversation::PARCEL_ATOM;
-			$atomns = 'atom';
 		} elseif ($xpath->query('/atom03:feed')->length > 0) {
 			$protocol = Conversation::PARCEL_ATOM03;
 			$atomns = 'atom03';
 		}
 
-		if (!empty($atomns)) {
+		if (in_array($protocol, [Conversation::PARCEL_ATOM, Conversation::PARCEL_ATOM03])) {
 			$alternate = XML::getFirstAttributes($xpath, $atomns . ":link[@rel='alternate']");
 			if (is_object($alternate)) {
 				foreach ($alternate as $attribute) {
@@ -335,7 +334,7 @@ class Feed
 						case 'text':
 							$body = $attribute->nodeValue;
 							break;
-	
+
 						case 'htmlUrl':
 							$plink = $attribute->nodeValue;
 							break;
@@ -343,7 +342,7 @@ class Feed
 						case 'xmlUrl':
 							$uri = $attribute->nodeValue;
 							break;
-	
+
 						case 'type':
 							$isrss = $attribute->nodeValue == 'rss';
 							break;
@@ -506,7 +505,7 @@ class Feed
 							$attachment['type'] = Post\Media::DOCUMENT;
 						}
 						$attachments[] = $attachment;
-					}				
+					}
 				}
 			}