Allow flask app to serve assets in cases there's no nginx server available.

Author: mzhang28

app.py

@@ -2,7 +2,7 @@
 import json
 import os
 
-from flask import Flask, request
+from flask import Flask, request, send_file
 
 app = Flask(__name__)
 app.config["UPLOAD_FOLDER"] = os.getenv("UPLOAD_FOLDER", "/usr/share/nginx/html")
@@ -37,6 +37,13 @@ def save():
     return filename
 
 
+# This route should be used for debugging filestore locally.
+
+@app.route("/static/<string:path>")
+def serve(path):
+    return send_file(os.path.join(app.config["UPLOAD_FOLDER"], path))
+
+
 if __name__ == "__main__":
     port = int(os.getenv("FILESTORE_PORT", "7910"))
     app.run(use_debugger=True, use_reloader=True, port=port, host="0.0.0.0")