staybuzz/index.html

## index.html
<!DOCTYPE html>
<html>

<head>
</head>

<body>
    <form method="POST">
        <input type="text" name="username" placeholder="Your name">
        <input type="submit" value="submit">
    </form>
</body>

</html>

## server.py
from flask import Flask, render_template, request, make_response
from redis import Redis
from datetime import datetime
import base64
import M2Crypto

app = Flask(__name__)
app.debug = True
redis = Redis(host='localhost', port=6379, decode_responses=True)


# ref: https://stackoverflow.com/questions/817882/unique-session-id-in-python
def _generate_session_id(num_bytes=32):
    return base64.b64encode(M2Crypto.m2.rand_bytes(num_bytes))


# ref: https://www.yoheim.net/blog.php?q=20160506
def _set_cookie(response, key, value):
    max_age = 60 * 60 * 24
    expires = int(datetime.now().timestamp()) + max_age
    response.set_cookie(key, value=value, max_age=max_age, expires=expires)
    return response


@app.route('/')
def index():
    sessid = request.cookies.get('sessid')
    if not sessid:
        response = render_template('index.html')
    else:
        response = f'welcome back, {redis.get(sessid)}'

    return make_response(response)


@app.route('/', methods=['POST'])
def hello_name():
    sessid = _generate_session_id()
    response = make_response(f"hello {request.form['username']}")
    response = _set_cookie(response, 'sessid', sessid)
    redis.set(sessid, request.form['username'])
    return response


if __name__ == "__main__":
    app.run()
	<!DOCTYPE html>
	<html>

	<head>
	</head>

	<body>
	<form method="POST">
	<input type="text" name="username" placeholder="Your name">
	<input type="submit" value="submit">
	</form>
	</body>

	</html>
	from flask import Flask, render_template, request, make_response
	from redis import Redis
	from datetime import datetime
	import base64
	import M2Crypto

	app = Flask(__name__)
	app.debug = True
	redis = Redis(host='localhost', port=6379, decode_responses=True)


	# ref: https://stackoverflow.com/questions/817882/unique-session-id-in-python
	def _generate_session_id(num_bytes=32):
	return base64.b64encode(M2Crypto.m2.rand_bytes(num_bytes))


	# ref: https://www.yoheim.net/blog.php?q=20160506
	def _set_cookie(response, key, value):
	max_age = 60 * 60 * 24
	expires = int(datetime.now().timestamp()) + max_age
	response.set_cookie(key, value=value, max_age=max_age, expires=expires)
	return response


	@app.route('/')
	def index():
	sessid = request.cookies.get('sessid')
	if not sessid:
	response = render_template('index.html')
	else:
	response = f'welcome back, {redis.get(sessid)}'

	return make_response(response)


	@app.route('/', methods=['POST'])
	def hello_name():
	sessid = _generate_session_id()
	response = make_response(f"hello {request.form['username']}")
	response = _set_cookie(response, 'sessid', sessid)
	redis.set(sessid, request.form['username'])
	return response


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