feat: storyboard generation (json, webvtt) and proxy

adds support for video storyboard extraction, generation and proxying

views.py

@@ -45,6 +45,21 @@ def thumbnailProxy(received_request):
 
 	return response
 
+def storyboardProxy(received_request):
+
+	# will proxy storyboards
+	prefix = "https://i.ytimg.com/"
+	sqp = request.args.get("sqp")
+	sigh = request.args.get("sigh")
+
+	if sqp is None or sigh is None:
+		return Response(json.dumps({"status": "error", "error": "Request lacks the sqp, sigh params (or both)."}), mimetype="application/json", status=400)
+
+	sb = requests.get(prefix + "sb/" + received_request, headers=ythdd_globals.getHeaders(caller='proxy'), params={"sqp": sqp, "sigh": sigh}, stream=True)
+	sb.raw.decode_content = True
+	response = Response(sb.raw, mimetype=sb.headers['content-type'], status=sb.status_code)
+	return response
+
 def ggphtProxy(received_request):
 
 	prefix = "https://yt3.ggpht.com/"