fixed crud list

fixed payments
upload -a

common/utils/utils.py

@@ -1,5 +1,12 @@
+import re
+
+from django.template.loader import render_to_string
+from django.utils.html import strip_tags
+
 from containers.models import Container
 from preinfo.models import Preinfo
+from django.conf import settings
+from django.core.mail import send_mail, EmailMessage
 
 
 def filter_queryset_by_user(queryset, user):
@@ -40,4 +47,43 @@ def get_container_by_number(number):
     try:
         return Container.objects.get(number=number, expedited=False)
     except Container.DoesNotExist:
-        return None
+        return None
+
+
+CALC_STRING = "0123456789A.BCDEFGHIJK.LMNOPQRSTU.VWXYZ"
+
+def check_container_number_validity(container_number):
+    if not re.search(r"[A-Z]{4}[0-9]{7}", container_number):
+        return False
+    subtotal = 0
+    delta = 1
+    for i in range(0, 10):
+        subtotal = subtotal + CALC_STRING.find(container_number[i]) * delta
+        delta = delta * 2
+    subtotal = (subtotal % 11) % 10
+    if not subtotal == CALC_STRING.find(container_number[10]):
+        return False
+    return True
+
+
+ADMIN_USER_EMAIL= settings.ADMIN_USER_EMAIL
+EMAIL_HOST_USER = settings.EMAIL_HOST_USER
+
+def send_test_email(user_email, urls):
+    subject='Welcome to Our Platform'
+    html_message = render_to_string('email.html', {
+        'site_name': 'Our Platform',
+        'user_email': user_email,
+        'link1': urls['pay_epay'],
+        'link2': urls['pay_credit_card'],
+    })
+    plain_message = strip_tags(html_message)
+
+    email = EmailMessage(
+        subject=subject,
+        body=html_message,
+        from_email=EMAIL_HOST_USER,
+        to=[user_email],
+    )
+    email.content_subtype = 'html'  # This tells Django to send HTML email
+    email.send()