Implement subscription management and ordering

app/settings.py

@@ -126,5 +126,7 @@ AUTH_USER_MODEL = "core.User"
 
 LOGIN_REDIRECT_URL = "/"
 
+# ALLOWED_PAYMENT_METHODS = ["bacs_debit", "card"]
+ALLOWED_PAYMENT_METHODS = ["card"]
 
 from app.local_settings import *  # noqa

app/urls.py

@@ -17,13 +17,20 @@ from django.conf import settings
 from django.conf.urls.static import static
 from django.contrib import admin
 from django.urls import include, path
+from django.views.generic import TemplateView
 
 from core.ui.views.drilldown import Drilldown
-from core.views import Billing, Home, Signup
+from core.views import Billing, Home, Order, Portal, Signup
 
 urlpatterns = [
     path("", Home.as_view(), name="home"),
     path("billing/", Billing.as_view(), name="billing"),
+    path("order/<str:product_id>/", Order.as_view(), name="order"),
+    path(
+        "success/", TemplateView.as_view(template_name="success.html"), name="success"
+    ),
+    path("cancel/", TemplateView.as_view(template_name="cancel.html"), name="cancel"),
+    path("portal", Portal.as_view(), name="portal"),
     path("admin/", admin.site.urls),
     path("accounts/", include("django.contrib.auth.urls")),
     path("accounts/signup/", Signup.as_view(), name="signup"),

core/lib/customers.py

@@ -1,5 +1,10 @@
+import logging
+
 import stripe
 
+logger = logging.getLogger(__name__)
+
+
 def expand_name(first_name, last_name):
     """
     Convert two name variables into one.
@@ -13,6 +18,7 @@ def expand_name(first_name, last_name):
             name += f" {last_name}"
     return name
 
+
 def get_or_create(email, first_name, last_name):
     """
     Get a customer ID from Stripe if one with the given email exists.
@@ -23,7 +29,7 @@ def get_or_create(email, first_name, last_name):
     matching_customers = stripe.Customer.list(email=email, limit=2)
     if len(matching_customers) == 2:
         # Something is horribly wrong
-        print("Two customers match!")
+        logger.error(f"Two customers found for email {email}")
         raise Exception(f"Two customers found for email {email}")
 
     elif len(matching_customers) == 1:
@@ -41,9 +47,11 @@ def get_or_create(email, first_name, last_name):
         if name:
             cast["name"] = name
         customer = stripe.Customer.create(**cast)
+        logger.info(f"Created new Stripe customer {customer.id} with email {email}")
 
         return customer.id
 
+
 def update_customer_fields(stripe_id, email=None, first_name=None, last_name=None):
     """
     Update the customer fields in Stripe.
@@ -52,7 +60,9 @@ def update_customer_fields(stripe_id, email=None, first_name=None, last_name=Non
     if email:
         print("Email modified")
         stripe.Customer.modify(stripe_id, email=email)
+        logger.info(f"Modified Stripe customer {stripe_id} to have email {email}")
     if first_name or last_name:
         print("Name modified")
         name = expand_name(first_name, last_name)
         stripe.Customer.modify(stripe_id, name=name)
+        logger.info(f"Modified Stripe customer {stripe_id} to have email {name}")

core/lib/products.py

@@ -0,0 +1,16 @@
+from core.models import Plan
+
+def assemble_plan_map(product_id_filter=None):
+    """
+    Get all the plans from the database and create an object Stripe wants.
+    """
+    line_items = []
+    for plan in Plan.objects.all():
+        if product_id_filter:
+            if plan.product_id != product_id_filter:
+                continue
+        line_items.append({
+            "price": plan.product_id,
+            "quantity": 1,
+        })
+    return line_items

core/migrations/0002_alter_plan_product_id_alter_user_email.py

@@ -0,0 +1,23 @@
+# Generated by Django 4.0.6 on 2022-07-09 09:41
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='plan',
+            name='product_id',
+            field=models.CharField(blank=True, max_length=255, null=True, unique=True),
+        ),
+        migrations.AlterField(
+            model_name='user',
+            name='email',
+            field=models.EmailField(max_length=254, unique=True),
+        ),
+    ]

core/migrations/0003_session.py

@@ -0,0 +1,21 @@
+# Generated by Django 4.0.6 on 2022-07-09 15:20
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0002_alter_plan_product_id_alter_user_email'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Session',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('email', models.EmailField(max_length=254, unique=True)),
+                ('session', models.CharField(max_length=255)),
+            ],
+        ),
+    ]

core/migrations/0004_alter_session_email.py

@@ -0,0 +1,18 @@
+# Generated by Django 4.0.6 on 2022-07-09 15:22
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0003_session'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='session',
+            name='email',
+            field=models.EmailField(max_length=254),
+        ),
+    ]

core/models.py

@@ -1,14 +1,19 @@
+import logging
+
+import stripe
 from django.contrib.auth.models import AbstractUser
 from django.db import models
 
 from core.lib.customers import get_or_create, update_customer_fields
 
+logger = logging.getLogger(__name__)
+
 
 class Plan(models.Model):
     name = models.CharField(max_length=255, unique=True)
     description = models.CharField(max_length=1024, null=True, blank=True)
     cost = models.IntegerField()
-    product_id = models.UUIDField(null=True, blank=True)
+    product_id = models.CharField(max_length=255, unique=True, null=True, blank=True)
     image = models.CharField(max_length=1024, null=True, blank=True)
 
     def __str__(self):
@@ -23,9 +28,9 @@ class User(AbstractUser):
     last_payment = models.DateTimeField(null=True, blank=True)
     paid = models.BooleanField(null=True, blank=True)
     plans = models.ManyToManyField(Plan, blank=True)
+    email = models.EmailField(unique=True)
 
-
-def __init__(self, *args, **kwargs):
+    def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self._original = self
 
@@ -48,8 +53,19 @@ def __init__(self, *args, **kwargs):
 
         super().save(*args, **kwargs)
 
+    def delete(self, *args, **kwargs):
+        if self.stripe_id:
+            stripe.Customer.delete(self.stripe_id)
+            logger.info(f"Deleted Stripe customer {self.stripe_id}")
+        super().delete(*args, **kwargs)
+
     def has_plan(self, plan):
         if not self.paid:  # We can't have any plans if we haven't paid
             return False
         plan_list = [plan.name for plan in self.plans.all()]
         return plan in plan_list
+
+
+class Session(models.Model):
+    email = models.EmailField()
+    session = models.CharField(max_length=255)

core/templates/billing.html

@@ -34,6 +34,9 @@
                 Last payment
               </li>
             </ul>
+            <form action="{% url 'portal' %}">
+              <input class="btn btn-lg btn-dark btn-block" type="submit" value="Subscription management">
+            </form>
           </div>
         </div>
 
@@ -46,6 +49,7 @@
           </div>
         </div>
 
+
       </div>
     </div>
   </div>

core/templates/partials/product-list.html

@@ -1,10 +1,10 @@
 {% load static %}
 
 {% for plan in plans %}
-
   {% if plan not in user_plans %}
-    <a href="order?product={{ plan.name }}">
+    <a href="/order/{{ plan.product_id}}">
   {% endif %}
+
   <div class="product">
     <img src="{% static plan.image %}" alt="Data image"/>
     <div class="description">
@@ -15,10 +15,10 @@
       {% endif %}
     </div>
   </div>
-
   {% if plan not in user_plans %}
     </a>
   {% endif %}
+  
 {% endfor %}
 
 <script type="text/javascript">

core/templates/success.html

@@ -1,12 +1,11 @@
 {% extends "base.html" %}
 
 {% block content %}
-  <head>
-    <title>Thanks for your order!</title>
-    <link rel="stylesheet" href="style.css">
-  </head>
-  <section>
-    <p>We appreciate your business!</p>
-    <p>Download details will be available <a href="{{ url_for('main.profile') }} ">in your profile</a> shortly.</p>
-  </section>
+  <h1 class="title">Pathogen Data Insights</h1>
+  <div class="container">
+    <h2 class="subtitle">Thank you for your order!</h2>
+    <div class="col">
+      <h2 class="subtitle">The customer portal will be available <a href="{% url 'billing' %} ">in your profile</a> shortly.</h2>
+    </div>
+  </div>
 {% endblock %}

core/views.py

@@ -1,11 +1,15 @@
+import stripe
+from django.conf import settings
 from django.contrib.auth.mixins import LoginRequiredMixin
-from django.shortcuts import render
-from django.urls import reverse_lazy
+from django.http import JsonResponse
+from django.shortcuts import redirect, render
+from django.urls import reverse, reverse_lazy
 from django.views import View
 from django.views.generic.edit import CreateView
 
 from core.forms import NewUserForm
-from core.models import Plan
+from core.lib.products import assemble_plan_map
+from core.models import Plan, Session
 
 # Create your views here
 # fmt: off
@@ -28,7 +32,35 @@ class Billing(LoginRequiredMixin, View):
         return render(request, self.template_name, context)
 
 
+class Order(LoginRequiredMixin, View):
+    def get(self, request, product_id):
+        try:
+            session = stripe.checkout.Session.create(
+                payment_method_types=settings.ALLOWED_PAYMENT_METHODS,
+                mode='subscription',
+                customer=request.user.stripe_id,
+                line_items=assemble_plan_map(product_id_filter=product_id),
+                success_url=request.build_absolute_uri(reverse("success")),
+                cancel_url=request.build_absolute_uri(reverse("cancel")),
+            )
+            Session.objects.create(email=request.user.email, session=session.id)
+            return redirect(session.url)
+            # return JsonResponse({'id': session.id})
+        except Exception as e:
+            # Raise a server error
+            return JsonResponse({"error": str(e)}, status=500)
+
+
 class Signup(CreateView):
     form_class = NewUserForm
     success_url = reverse_lazy("login")
     template_name = "registration/signup.html"
+
+
+class Portal(LoginRequiredMixin, View):
+    def get(self, request):
+        session = stripe.billing_portal.Session.create(
+            customer=request.user.stripe_id,
+            return_url=request.build_absolute_uri(),
+        )
+        return redirect(session.url)