Add support for iframes in imported HTML

server/utils/turndown/frames.ts

@@ -0,0 +1,21 @@
+import TurndownService from "turndown";
+
+/**
+ * A turndown plugin to convert iframes to markdown links.
+ *
+ * @param turndownService The TurndownService instance.
+ */
+export default function images(turndownService: TurndownService) {
+  turndownService.addRule("frames", {
+    filter: "iframe",
+    replacement(content, node: HTMLIFrameElement) {
+      const src = (node.getAttribute("src") || "").replace(/\n+/g, "");
+      const title = cleanAttribute(node.getAttribute("title") || "");
+      return src ? "[" + (title || src) + "]" + "(" + src + ")" : "";
+    },
+  });
+}
+
+function cleanAttribute(attribute: string) {
+  return attribute ? attribute.replace(/(\n+\s*)+/g, "\n") : "";
+}

server/utils/turndown/index.ts

@@ -4,6 +4,7 @@ import breaks from "./breaks";
 import confluenceCodeBlock from "./confluence-code-block";
 import confluenceTaskList from "./confluence-task-list";
 import emptyLists from "./empty-lists";
+import frames from "./frames";
 import images from "./images";
 
 /**
@@ -25,6 +26,7 @@ const service = new TurndownService({
 })
   .remove(["script", "style", "title", "head"])
   .use(gfm)
+  .use(frames)
   .use(confluenceTaskList)
   .use(confluenceCodeBlock)
   .use(images)