https://twitter.com/inaniwa3/status/1241341971102195712

akita.py

from flask import Flask, request, abort, render_template
import geoip2.database

app = Flask(__name__)

# https://dev.maxmind.com/geoip/geoip2/geolite2/
reader = geoip2.database.Reader('./GeoLite2-City.mmdb')

@app.before_request
def before_request():
    remote_addr = request.headers.get('X-Forwarded-For')

    response = None
    try:
        response = reader.city(remote_addr)
    except:
        return abort(403)

    name = ''
    if response.subdivisions:
        name = response.subdivisions.most_specific.names.get('ja')

    if name != '秋田県':
        return abort(403)

    return

@app.route('/')
def route():
    return render_template('akita.html')