flask for static files - plus index.html when a directory is specified

wurkmaybe.py

import os, json
from werkzeug.contrib.fixers import ProxyFix
from flask import Flask, redirect, url_for, send_from_directory
from flask_dance.contrib.github import make_github_blueprint, github

from os.path import join, isfile, isdir

# http://librelist.com/browser/flask/2012/2/22/flask-on-heroku-+-gunicorn-static-files/#109c5d714212f483bcbeecd778c879ad

PROJECT_ROOT = os.path.dirname(os.path.realpath(__file__))
STATIC_PATH = 'samplesite'

app = Flask(__name__)
            #static_folder=STATIC_PATH, #os.path.join(PROJECT_ROOT,STATIC_PATH),
            #static_url_path='')

app.wsgi_app = ProxyFix(app.wsgi_app)
app.secret_key = os.environ.get("FLASK_SECRET_KEY", "supersekrit")

app.config["RESULT_STATIC_PATH"] = STATIC_PATH
app.config["GITHUB_OAUTH_CLIENT_ID"] = os.environ.get("GITHUB_OAUTH_CLIENT_ID")
app.config["GITHUB_OAUTH_CLIENT_SECRET"] = os.environ.get("GITHUB_OAUTH_CLIENT_SECRET")
github_bp = make_github_blueprint(
                        client_id = os.environ.get('GITHUB_OAUTH_CLIENT_ID'),
                        client_secret = os.environ.get('GITHUB_OAUTH_CLIENT_SECRET'),
                        scope='read:org')
app.register_blueprint(github_bp, url_prefix="/login")

#@app.route('/')
#def root():
#    return send_from_directory(app.config["RESULT_STATIC_PATH"],'index.html')

@app.route('/', defaults={'path': ''})
@app.route('/<path:path>')
def catch_all(path):
    rsp = app.config["RESULT_STATIC_PATH"]
    if(isdir(join(rsp,path))):
        return send_from_directory(join(rsp,path),'index.html')

    elif(isfile(join(rsp,path))):
        return send_from_directory(rsp, path)

    elif(path==''):
        return send_from_directory(rsp, 'index.html')

    else:
        return send_from_directory(rsp, '404.html')


if __name__ == "__main__":
    app.run()