Fix canonical url not working

src/classes/emebd-uri-interface.php

@@ -0,0 +1,39 @@
+<?php
+
+/**
+ * Return the canonical URL
+ *
+ * @see https://github.com/oscarotero/Embed/issues/478
+ */
+
+namespace Embed\Detectors;
+
+use Psr\Http\Message\UriInterface;
+
+class Url extends Detector
+{
+    public function detect(): UriInterface
+    {
+        $oembed = $this->extractor->getOEmbed();
+
+        return $oembed->url('url')
+            ?: $oembed->url('web_page')
+            ?: $this->getCanonical()
+            ?: $this->extractor->getUri();
+    }
+
+    protected function getCanonical(): ?UriInterface
+    {
+        $document = $this->extractor->getDocument();
+
+        foreach ($document->select('.//link[@canonical]')->nodes() as $node) {
+            $href = $node->getAttribute('href');
+
+            if ($href) {
+                return $this->extractor->resolveUri($href);
+            }
+        }
+
+        return null;
+    }
+}