Fix video thumbnail generation (fixes #3484) (#4539)

* Fix video thumbnail generation (fixes #3484)

* fix test

crates/api_common/src/request.rs

@@ -59,14 +59,8 @@ pub async fn fetch_link_metadata(
   let opengraph_data = extract_opengraph_data(&html_bytes, url)
     .map_err(|e| info!("{e}"))
     .unwrap_or_default();
-  let thumbnail = extract_thumbnail_from_opengraph_data(
-    url,
-    &opengraph_data,
-    &content_type,
-    generate_thumbnail,
-    context,
-  )
-  .await;
+  let thumbnail =
+    extract_thumbnail_from_opengraph_data(url, &opengraph_data, generate_thumbnail, context).await;
 
   Ok(LinkMetadata {
     opengraph_data,
@@ -158,23 +152,21 @@ fn extract_opengraph_data(html_bytes: &[u8], url: &Url) -> Result<OpenGraphData,
 pub async fn extract_thumbnail_from_opengraph_data(
   url: &Url,
   opengraph_data: &OpenGraphData,
-  content_type: &Option<Mime>,
   generate_thumbnail: bool,
   context: &LemmyContext,
 ) -> Option<DbUrl> {
-  let is_image = content_type.as_ref().unwrap_or(&mime::TEXT_PLAIN).type_() == mime::IMAGE;
-  if generate_thumbnail && is_image {
+  if generate_thumbnail {
     let image_url = opengraph_data
       .image
       .as_ref()
-      .map(lemmy_db_schema::newtypes::DbUrl::inner)
+      .map(DbUrl::inner)
       .unwrap_or(url);
     generate_pictrs_thumbnail(image_url, context)
       .await
       .ok()
       .map(Into::into)
   } else {
-    None
+    opengraph_data.image.clone()
   }
 }
 
@@ -363,7 +355,7 @@ mod tests {
       Some(mime::TEXT_HTML_UTF_8.to_string()),
       sample_res.content_type
     );
-    assert_eq!(None, sample_res.thumbnail);
+    assert!(sample_res.thumbnail.is_some());
   }
 
   // #[test]