Given a (static) endpoint, return its actual filesystem location.

flask_static_file_for.py

import os
from flask import current_app, request

def static_file_for(endpoint, filename=None):
    if endpoint[0] == '.' and request.blueprint:
        folder = current_app.blueprints[request.blueprint].static_folder
    else:
        folder = current_app.static_folder
    return os.path.join(folder, filename) if folder else None