Rename / prepare for merge with uncloud repo

uncloud_django_based/uncloud/uncloud_pay/stripe.py

@@ -0,0 +1,133 @@
+import stripe
+import stripe.error
+import logging
+
+from django.core.exceptions import ObjectDoesNotExist
+import uncloud_pay.models
+
+import uncloud.secrets
+
+# Static stripe configuration used below.
+CURRENCY = 'chf'
+
+stripe.api_key = uncloud.secrets.STRIPE_KEY
+
+# Helper (decorator) used to catch errors raised by stripe logic.
+def handle_stripe_error(f):
+    def handle_problems(*args, **kwargs):
+        response = {
+            'paid': False,
+            'response_object': None,
+            'error': None
+        }
+
+        common_message = "Currently it is not possible to make payments."
+        try:
+            response_object = f(*args, **kwargs)
+            response = {
+                'response_object': response_object,
+                'error': None
+            }
+            return response
+        except stripe.error.CardError as e:
+            # Since it's a decline, stripe.error.CardError will be caught
+            body = e.json_body
+            err = body['error']
+            response.update({'error': err['message']})
+            logging.error(str(e))
+            return response
+        except stripe.error.RateLimitError:
+            response.update(
+                {'error': "Too many requests made to the API too quickly"})
+            return response
+        except stripe.error.InvalidRequestError as e:
+            logging.error(str(e))
+            response.update({'error': "Invalid parameters"})
+            return response
+        except stripe.error.AuthenticationError as e:
+            # Authentication with Stripe's API failed
+            # (maybe you changed API keys recently)
+            logging.error(str(e))
+            response.update({'error': common_message})
+            return response
+        except stripe.error.APIConnectionError as e:
+            logging.error(str(e))
+            response.update({'error': common_message})
+            return response
+        except stripe.error.StripeError as e:
+            # maybe send email
+            logging.error(str(e))
+            response.update({'error': common_message})
+            return response
+        except Exception as e:
+            # maybe send email
+            logging.error(str(e))
+            response.update({'error': common_message})
+            return response
+
+    return handle_problems
+
+# Convenience CC container, also used for serialization.
+class CreditCard():
+    number = None
+    exp_year = None
+    exp_month = None
+    cvc = None
+
+    def __init__(self, number, exp_month, exp_year, cvc):
+        self.number=number
+        self.exp_year = exp_year
+        self.exp_month = exp_month
+        self.cvc = cvc
+
+# Actual Stripe logic.
+
+def get_customer_id_for(user):
+    try:
+        # .get() raise if there is no matching entry.
+        return uncloud_pay.models.StripeCustomer.objects.get(owner=user).stripe_id
+    except ObjectDoesNotExist:
+        # No entry yet - making a new one.
+        customer_request = create_customer(user.username, user.email)
+        if customer_request['error'] == None:
+            mapping = uncloud_pay.models.StripeCustomer.objects.create(
+                    owner=user,
+                    stripe_id=customer_request['response_object']['id']
+                    )
+            return mapping.stripe_id
+        else:
+            return None
+
+@handle_stripe_error
+def create_card(customer_id, credit_card):
+    return stripe.Customer.create_source(
+            customer_id,
+            card={
+                'number': credit_card.number,
+                'exp_month': credit_card.exp_month,
+                'exp_year': credit_card.exp_year,
+                'cvc': credit_card.cvc
+                })
+
+@handle_stripe_error
+def get_card(customer_id, card_id):
+    return stripe.Customer.retrieve_source(customer_id, card_id)
+
+@handle_stripe_error
+def charge_customer(amount, customer_id, card_id):
+    # Amount is in CHF but stripes requires smallest possible unit.
+    # See https://stripe.com/docs/api/charges/create
+    adjusted_amount = int(amount * 100)
+    return stripe.Charge.create(
+            amount=adjusted_amount,
+            currency=CURRENCY,
+            customer=customer_id,
+            source=card_id)
+
+@handle_stripe_error
+def create_customer(name, email):
+    return stripe.Customer.create(name=name, email=email)
+
+@handle_stripe_error
+def get_customer(customer_id):
+    return stripe.Customer.retrieve(customer_id)