bchaber/app.py

## app.py
from flask import Flask
from flask import request
from flask import make_response
from json import loads, dumps
app = Flask(__name__)

@app.route("/add2cart", methods=["POST"])
def add2cart():
  cart = {} # default value, can be loaded from cookies
  cookies = request.headers.get("Cookie", "")
  for cookie in cookies.split(";"): # foo=1; cart={}; bar=true; baz=abc
    if cookie.startswith("cart="):
      cart = loads(cookie[len("cart="):]) # assume that it is JSON

  product = request.form.get("product", "")
  if product.strip() == "": # strip removes leading and trailing whitespaces
    response = make_response("Pusta nazwa produktu", 400)
    return response # exit early with an error code

  print(f"Dodaje {product} do {cart}")
  if product in cart:
    cart[product] += 1 # increase
  else:
    cart[product]  = 1 # initialize

  response = make_response("OK", 200)
  response.headers["Set-Cookie"] = "cart=" + dumps(cart) + "; HttpOnly"
  return response

@app.route("/")
def index():
  html = """
<!doctype html>
<html>
 <body>
  <form action="/add2cart" method="POST">
   <input type="text" name="product" placeholder="Nazwa produktu" />
   <input type="submit" value="Dodaj jedną sztukę do koszyka" />
  </form>

  <p>W naszym warzywniaku mamy</p>
  <ul>
   <li>Marchewka;</li>
   <li>Rzodkiewka;</li>
   <li>Ogórek;</li>
   <li>Kalarepka.</li>
  </ul>
"""
  response = make_response(html, 200)
  return response

# $ python3 -m pip install flask
# $ python3 app.py
app.run() # go to http://127.0.0.1:5000/
	from flask import Flask
	from flask import request
	from flask import make_response
	from json import loads, dumps
	app = Flask(__name__)

	@app.route("/add2cart", methods=["POST"])
	def add2cart():
	cart = {} # default value, can be loaded from cookies
	cookies = request.headers.get("Cookie", "")
	for cookie in cookies.split(";"): # foo=1; cart={}; bar=true; baz=abc
	if cookie.startswith("cart="):
	cart = loads(cookie[len("cart="):]) # assume that it is JSON

	product = request.form.get("product", "")
	if product.strip() == "": # strip removes leading and trailing whitespaces
	response = make_response("Pusta nazwa produktu", 400)
	return response # exit early with an error code

	print(f"Dodaje {product} do {cart}")
	if product in cart:
	cart[product] += 1 # increase
	else:
	cart[product] = 1 # initialize

	response = make_response("OK", 200)
	response.headers["Set-Cookie"] = "cart=" + dumps(cart) + "; HttpOnly"
	return response

	@app.route("/")
	def index():
	html = """
	<!doctype html>
	<html>
	<body>
	<form action="/add2cart" method="POST">
	<input type="text" name="product" placeholder="Nazwa produktu" />
	<input type="submit" value="Dodaj jedną sztukę do koszyka" />
	</form>

	<p>W naszym warzywniaku mamy</p>
	<ul>
	<li>Marchewka;</li>
	<li>Rzodkiewka;</li>
	<li>Ogórek;</li>
	<li>Kalarepka.</li>
	</ul>
	"""
	response = make_response(html, 200)
	return response

	# $ python3 -m pip install flask
	# $ python3 app.py
	app.run() # go to http://127.0.0.1:5000/