django-orchestra/orchestra/apps/payments/models.py

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from django.core.exceptions import ValidationError
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from django.db import models
from django.utils.functional import cached_property
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from django.utils.translation import ugettext_lazy as _
from jsonfield import JSONField
from orchestra.core import accounts
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from orchestra.models.queryset import group_by
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from . import settings
from .methods import PaymentMethod
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class PaymentSourcesQueryset(models.QuerySet):
def get_default(self):
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return self.filter(is_active=True).first()
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class PaymentSource(models.Model):
account = models.ForeignKey('accounts.Account', verbose_name=_("account"),
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related_name='paymentsources')
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method = models.CharField(_("method"), max_length=32,
choices=PaymentMethod.get_plugin_choices())
data = JSONField(_("data"))
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is_active = models.BooleanField(_("is active"), default=True)
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objects = PaymentSourcesQueryset.as_manager()
def __unicode__(self):
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return "%s (%s)" % (self.label, self.method_class.verbose_name)
@cached_property
def method_class(self):
return PaymentMethod.get_plugin(self.method)
@cached_property
def label(self):
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return self.method_class().get_label(self.data)
@cached_property
def number(self):
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return self.method_class().get_number(self.data)
def get_bill_context(self):
method = self.method_class()
return {
'message': method.get_bill_message(self),
}
def get_due_delta(self):
return self.method_class().due_delta
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class TransactionQuerySet(models.QuerySet):
group_by = group_by
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def create(self, **kwargs):
source = kwargs.get('source')
if source is None or not hasattr(source.method_class, 'process'):
# Manual payments don't need processing
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kwargs['state']=self.model.WAITTING_EXECUTION
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return super(TransactionQuerySet, self).create(**kwargs)
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def secured(self):
return self.filter(state=Transaction.SECURED)
def exclude_rejected(self):
return self.exclude(state=Transaction.REJECTED)
def amount(self):
return self.aggregate(models.Sum('amount')).values()[0]
def processing(self):
return self.filter(state__in=[Transaction.EXECUTED, Transaction.WAITTING_EXECUTION])
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class Transaction(models.Model):
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WAITTING_PROCESSING = 'WAITTING_PROCESSING' # CREATED
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WAITTING_EXECUTION = 'WAITTING_EXECUTION' # PROCESSED
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EXECUTED = 'EXECUTED'
SECURED = 'SECURED'
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REJECTED = 'REJECTED'
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STATES = (
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(WAITTING_PROCESSING, _("Waitting processing")),
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(WAITTING_EXECUTION, _("Waitting execution")),
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(EXECUTED, _("Executed")),
(SECURED, _("Secured")),
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(REJECTED, _("Rejected")),
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)
bill = models.ForeignKey('bills.bill', verbose_name=_("bill"),
related_name='transactions')
source = models.ForeignKey(PaymentSource, null=True, blank=True,
verbose_name=_("source"), related_name='transactions')
process = models.ForeignKey('payments.TransactionProcess', null=True,
blank=True, verbose_name=_("process"), related_name='transactions')
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state = models.CharField(_("state"), max_length=32, choices=STATES,
default=WAITTING_PROCESSING)
amount = models.DecimalField(_("amount"), max_digits=12, decimal_places=2)
currency = models.CharField(max_length=10, default=settings.PAYMENT_CURRENCY)
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created_at = models.DateTimeField(_("created"), auto_now_add=True)
modified_at = models.DateTimeField(_("modified"), auto_now=True)
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objects = TransactionQuerySet.as_manager()
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def __unicode__(self):
return "Transaction {}".format(self.id)
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@property
def account(self):
return self.bill.account
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def clean(self):
if not self.pk:
amount = self.bill.transactions.exclude(state=self.REJECTED).amount()
if amount >= self.bill.total:
raise ValidationError(_("New transactions can not be allocated for this bill"))
def mark_as_processed(self):
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assert self.state == self.WAITTING_PROCESSING
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self.state = self.WAITTING_EXECUTION
self.save()
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def mark_as_executed(self):
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assert self.state == self.WAITTING_EXECUTION
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self.state = self.EXECUTED
self.save()
def mark_as_secured(self):
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assert self.state == self.EXECUTED
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self.state = self.SECURED
self.save()
def mark_as_rejected(self):
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assert self.state == self.EXECUTED
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self.state = self.REJECTED
self.save()
class TransactionProcess(models.Model):
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"""
Stores arbitrary data generated by payment methods while processing transactions
"""
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CREATED = 'CREATED'
EXECUTED = 'EXECUTED'
ABORTED = 'ABORTED'
COMMITED = 'COMMITED'
STATES = (
(CREATED, _("Created")),
(EXECUTED, _("Executed")),
(ABORTED, _("Aborted")),
(COMMITED, _("Commited")),
)
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data = JSONField(_("data"), blank=True)
file = models.FileField(_("file"), blank=True)
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state = models.CharField(_("state"), max_length=16, choices=STATES, default=CREATED)
created_at = models.DateTimeField(_("created"), auto_now_add=True)
updated_at = models.DateTimeField(_("updated"), auto_now=True)
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class Meta:
verbose_name_plural = _("Transaction processes")
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def __unicode__(self):
return str(self.id)
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def mark_as_executed(self):
assert self.state == self.CREATED
self.state = self.EXECUTED
for transaction in self.transactions.all():
transaction.mark_as_executed()
self.save()
def abort(self):
assert self.state in [self.CREATED, self.EXCECUTED]
self.state = self.ABORTED
for transaction in self.transaction.all():
transaction.mark_as_aborted()
self.save()
def commit(self):
assert self.state in [self.CREATED, self.EXECUTED]
self.state = self.COMMITED
for transaction in self.transactions.processing():
transaction.mark_as_secured()
self.save()
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accounts.register(PaymentSource)
accounts.register(Transaction)