Sith/eboutic/models.py

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# -*- coding:utf-8 -*
#
# Copyright 2016,2017
# - Skia <skia@libskia.so>
#
# Ce fichier fait partie du site de l'Association des Étudiants de l'UTBM,
# http://ae.utbm.fr.
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License a published by the Free Software
# Foundation; either version 3 of the License, or (at your option) any later
# version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Sofware Foundation, Inc., 59 Temple
# Place - Suite 330, Boston, MA 02111-1307, USA.
#
#
import hmac
import html
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import typing
from datetime import datetime
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from typing import List
from dict2xml import dict2xml
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from django.conf import settings
from django.db import models, DataError
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from django.db.models import Sum, F
from django.utils.functional import cached_property
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from django.utils.translation import gettext_lazy as _
from accounting.models import CurrencyField
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from core.models import Group, User
from counter.models import Counter, Product, Selling, Refilling, BillingInfo, Customer
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def get_eboutic_products(user: User) -> List[Product]:
products = (
Counter.objects.get(type="EBOUTIC")
.products.filter(product_type__isnull=False)
.filter(archived=False)
.filter(limit_age__lte=user.age)
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.annotate(priority=F("product_type__priority"))
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.annotate(category=F("product_type__name"))
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.annotate(category_comment=F("product_type__comment"))
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)
return [p for p in products if p.can_be_sold_to(user)]
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class Basket(models.Model):
"""
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Basket is built when the user connects to an eboutic page
"""
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user = models.ForeignKey(
User,
related_name="baskets",
verbose_name=_("user"),
blank=False,
on_delete=models.CASCADE,
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)
date = models.DateTimeField(_("date"), auto_now=True)
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def add_product(self, p: Product, q: int = 1):
"""
Given p an object of the Product model and q an integer,
add q items corresponding to this Product from the basket.
If this function is called with a product not in the basket, no error will be raised
"""
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item = self.items.filter(product_id=p.id).first()
if item is None:
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BasketItem(
basket=self,
product_id=p.id,
product_name=p.name,
type_id=p.product_type.id,
quantity=q,
product_unit_price=p.selling_price,
).save()
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else:
item.quantity += q
item.save()
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def del_product(self, p: Product, q: int = 1):
"""
Given p an object of the Product model and q an integer,
remove q items corresponding to this Product from the basket.
If this function is called with a product not in the basket, no error will be raised
"""
try:
item = self.items.get(product_id=p.id)
except BasketItem.DoesNotExist:
return
item.quantity -= q
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if item.quantity <= 0:
item.delete()
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else:
item.save()
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def clear(self) -> None:
"""
Remove all items from this basket without deleting the basket
"""
self.items.all().delete()
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@cached_property
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def contains_refilling_item(self) -> bool:
return self.items.filter(
type_id=settings.SITH_COUNTER_PRODUCTTYPE_REFILLING
).exists()
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def get_total(self) -> float:
total = self.items.aggregate(
total=Sum(F("quantity") * F("product_unit_price"))
)["total"]
return float(total) if total is not None else 0
@classmethod
def from_session(cls, session) -> typing.Union["Basket", None]:
"""
Given an HttpRequest django object, return the basket used in the current session
if it exists else None
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"""
if "basket_id" in session:
try:
return cls.objects.get(id=session["basket_id"])
except cls.DoesNotExist:
return None
return None
def generate_sales(self, counter, seller: User, payment_method: str):
"""
Generate a list of sold items corresponding to the items
of this basket WITHOUT saving them NOR deleting the basket
Example:
::
counter = Counter.objects.get(name="Eboutic")
sales = basket.generate_sales(counter, "SITH_ACCOUNT")
# here the basket is in the same state as before the method call
with transaction.atomic():
for sale in sales:
sale.save()
basket.delete()
# all the basket items are deleted by the on_delete=CASCADE relation
# thus only the sales remain
"""
# I must proceed with two distinct requests instead of
# only one with a join because the AbstractBaseItem model has been
# poorly designed. If you refactor the model, please refactor this too.
items = self.items.order_by("product_id")
ids = [item.product_id for item in items]
products = Product.objects.filter(id__in=ids).order_by("id")
# items and products are sorted in the same order
sales = []
for item, product in zip(items, products):
sales.append(
Selling(
label=product.name,
counter=counter,
club=product.club,
product=product,
seller=seller,
customer=self.user.customer,
unit_price=item.product_unit_price,
quantity=item.quantity,
payment_method=payment_method,
)
)
return sales
def get_e_transaction_data(self):
user = self.user
if not hasattr(user, "customer"):
raise Customer.DoesNotExist
customer = user.customer
if not hasattr(user.customer, "billing_infos"):
raise BillingInfo.DoesNotExist
data = [
("PBX_SITE", settings.SITH_EBOUTIC_PBX_SITE),
("PBX_RANG", settings.SITH_EBOUTIC_PBX_RANG),
("PBX_IDENTIFIANT", settings.SITH_EBOUTIC_PBX_IDENTIFIANT),
("PBX_TOTAL", str(int(self.get_total() * 100))),
("PBX_DEVISE", "978"), # This is Euro
("PBX_CMD", str(self.id)),
("PBX_PORTEUR", user.email),
("PBX_RETOUR", "Amount:M;BasketID:R;Auto:A;Error:E;Sig:K"),
("PBX_HASH", "SHA512"),
("PBX_TYPEPAIEMENT", "CARTE"),
("PBX_TYPECARTE", "CB"),
("PBX_TIME", datetime.now().replace(microsecond=0).isoformat("T")),
]
cart = {
"shoppingcart": {"total": {"totalQuantity": min(self.items.count(), 99)}}
}
cart = '<?xml version="1.0" encoding="UTF-8" ?>' + dict2xml(
cart, newlines=False
)
data += [
("PBX_SHOPPINGCART", cart),
("PBX_BILLING", customer.billing_infos.to_3dsv2_xml()),
]
pbx_hmac = hmac.new(
settings.SITH_EBOUTIC_HMAC_KEY,
bytes("&".join("=".join(d) for d in data), "utf-8"),
"sha512",
)
data.append(("PBX_HMAC", pbx_hmac.hexdigest().upper()))
return data
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def __str__(self):
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return "%s's basket (%d items)" % (self.user, self.items.all().count())
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class Invoice(models.Model):
"""
Invoices are generated once the payment has been validated
"""
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user = models.ForeignKey(
User,
related_name="invoices",
verbose_name=_("user"),
blank=False,
on_delete=models.CASCADE,
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)
date = models.DateTimeField(_("date"), auto_now=True)
validated = models.BooleanField(_("validated"), default=False)
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def get_total(self) -> float:
total = self.items.aggregate(
total=Sum(F("quantity") * F("product_unit_price"))
)["total"]
return float(total) if total is not None else 0
def validate(self):
if self.validated:
raise DataError(_("Invoice already validated"))
eboutic = Counter.objects.filter(type="EBOUTIC").first()
for i in self.items.all():
if i.type_id == settings.SITH_COUNTER_PRODUCTTYPE_REFILLING:
new = Refilling(
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counter=eboutic,
customer=self.user.customer,
operator=self.user,
amount=i.product_unit_price * i.quantity,
payment_method="CARD",
bank="OTHER",
date=self.date,
)
new.save()
else:
product = Product.objects.filter(id=i.product_id).first()
new = Selling(
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label=i.product_name,
counter=eboutic,
club=product.club,
product=product,
seller=self.user,
customer=self.user.customer,
unit_price=i.product_unit_price,
quantity=i.quantity,
payment_method="CARD",
is_validated=True,
date=self.date,
)
new.save()
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self.validated = True
self.save()
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def __str__(self):
return "%s - %s - %s" % (self.user, self.get_total(), self.date)
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class AbstractBaseItem(models.Model):
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product_id = models.IntegerField(_("product id"))
product_name = models.CharField(_("product name"), max_length=255)
type_id = models.IntegerField(_("product type id"))
product_unit_price = CurrencyField(_("unit price"))
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quantity = models.PositiveIntegerField(_("quantity"))
class Meta:
abstract = True
def __str__(self):
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return "Item: %s (%s) x%d" % (
self.product_name,
self.product_unit_price,
self.quantity,
)
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class BasketItem(AbstractBaseItem):
basket = models.ForeignKey(
Basket, related_name="items", verbose_name=_("basket"), on_delete=models.CASCADE
)
@classmethod
def from_product(cls, product: Product, quantity: int):
"""
Create a BasketItem with the same characteristics as the
product passed in parameters, with the specified quantity
WARNING : the basket field is not filled, so you must set
it yourself before saving the model
"""
return cls(
product_id=product.id,
product_name=product.name,
type_id=product.product_type.id,
quantity=quantity,
product_unit_price=product.selling_price,
)
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class InvoiceItem(AbstractBaseItem):
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invoice = models.ForeignKey(
Invoice,
related_name="items",
verbose_name=_("invoice"),
on_delete=models.CASCADE,
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)