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core/lib/customers.py

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+import logging
+
+import stripe
+
+logger = logging.getLogger(__name__)
+
+
+def expand_name(first_name, last_name):
+    """
+    Convert two name variables into one.
+    Last name without a first name is ignored.
+    """
+    name = None
+    if first_name:
+        name = first_name
+        # We only want to put the last name if we have a first name
+        if 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.
+    Create a customer if one does not.
+    Raise an exception if two or more customers matching the given email exist.
+    """
+    # Let's see if we're just missing the ID
+    matching_customers = stripe.Customer.list(email=email, limit=2)
+    if len(matching_customers) == 2:
+        # Something is horribly wrong
+        logger.error(f"Two customers found for email {email}")
+        raise Exception(f"Two customers found for email {email}")
+
+    elif len(matching_customers) == 1:
+        # We found a customer. Let's copy the ID
+        customer = matching_customers["data"][0]
+        customer_id = customer["id"]
+        return customer_id
+
+    else:
+        # We didn't find anything. Create the customer
+
+        # Create a name, since we have 2 variables which could be null
+        name = expand_name(first_name, last_name)
+        cast = {"email": email}
+        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.
+    """
+    if email:
+        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:
+        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

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+from asgiref.sync import sync_to_async
+
+from core.models import Plan
+
+
+async 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 await sync_to_async(list)(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