sanitize: properly handle cached content in archived articles

include/functions2.php

@@ -893,23 +893,22 @@
 		$doc->loadHTML($charset_hack . $res);
 		$xpath = new DOMXPath($doc);
 
-		$entries = $xpath->query('(//a[@href]|//img[@src]|//video/source[@src])');
-
 		$ttrss_uses_https = parse_url(get_self_url_prefix(), PHP_URL_SCHEME) === 'https';
+		$rewrite_base_url = $site_url ? $site_url : SELF_URL_PATH;
 
-		foreach ($entries as $entry) {
+		$entries = $xpath->query('(//a[@href]|//img[@src]|//video/source[@src])');
 
-			if ($site_url) {
+		foreach ($entries as $entry) {
 
 			if ($entry->hasAttribute('href')) {
 				$entry->setAttribute('href',
-						rewrite_relative_url($site_url, $entry->getAttribute('href')));
+					rewrite_relative_url($rewrite_base_url, $entry->getAttribute('href')));
 
 				$entry->setAttribute('rel', 'noopener noreferrer');
 			}
 
 			if ($entry->hasAttribute('src')) {
-					$src = rewrite_relative_url($site_url, $entry->getAttribute('src'));
+				$src = rewrite_relative_url($rewrite_base_url, $entry->getAttribute('src'));
 
 				$extension = $entry->tagName == 'source' ? '.mp4' : '.png';
 				$cached_filename = CACHE_DIR . '/images/' . sha1($src) . $extension;
@@ -962,7 +961,6 @@
 					$entry->parentNode->replaceChild($p, $entry);
 				}
 			}
-			}
 
 			if (strtolower($entry->nodeName) == "a") {
 				$entry->setAttribute("target", "_blank");