283 lines
12 KiB
Python
283 lines
12 KiB
Python
import datetime
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import lxml.builder
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import os
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from lxml import etree
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from lxml.builder import E
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from StringIO import StringIO
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from django import forms
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from django.utils import timezone
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from django.utils.translation import ugettext_lazy as _
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from django_iban.forms import IBANFormField
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from django_iban.validators import IBANValidator, IBAN_COUNTRY_CODE_LENGTH
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from rest_framework import serializers
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from .. import settings
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from .options import PaymentSourceDataForm, PaymentMethod
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class SEPADirectDebitForm(PaymentSourceDataForm):
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iban = IBANFormField(label='IBAN',
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widget=forms.TextInput(attrs={'size': '50'}))
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name = forms.CharField(max_length=128, label=_("Name"),
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widget=forms.TextInput(attrs={'size': '50'}))
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class SEPADirectDebitSerializer(serializers.Serializer):
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iban = serializers.CharField(label='IBAN', validators=[IBANValidator()],
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min_length=min(IBAN_COUNTRY_CODE_LENGTH.values()), max_length=34)
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name = serializers.CharField(label=_("Name"), max_length=128)
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class SEPADirectDebit(PaymentMethod):
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verbose_name = _("SEPA Direct Debit")
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label_field = 'name'
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number_field = 'iban'
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process_credit = True
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form = SEPADirectDebitForm
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serializer = SEPADirectDebitSerializer
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due_delta = datetime.timedelta(days=5)
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def get_bill_message(self, source):
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return _("This bill will been automatically charged to your bank account "
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" with IBAN number<br><strong>%s</strong>.") % source.number
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@classmethod
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def process(cls, transactions):
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debts = []
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credits = []
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for transaction in transactions:
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if transaction.amount < 0:
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credits.append(transaction)
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else:
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debts.append(transaction)
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processes = []
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if debts:
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proc = cls.process_debts(debts)
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processes.append(proc)
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if credits:
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proc = cls.process_credits(credits)
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processes.append(proc)
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return processes
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@classmethod
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def process_credits(cls, transactions):
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from ..models import TransactionProcess
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process = TransactionProcess.objects.create()
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context = cls.get_context(transactions)
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sepa = lxml.builder.ElementMaker(
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nsmap = {
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'xsi': 'http://www.w3.org/2001/XMLSchema-instance',
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None: 'urn:iso:std:iso:20022:tech:xsd:pain.001.001.03',
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}
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)
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sepa = sepa.Document(
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E.CstmrCdtTrfInitn(
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cls.get_header(context),
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E.PmtInf( # Payment Info
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E.PmtInfId(str(process.id)), # Payment Id
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E.PmtMtd("TRF"), # Payment Method
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E.NbOfTxs(context['num_transactions']), # Number of Transactions
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E.CtrlSum(context['total']), # Control Sum
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E.ReqdExctnDt ( # Requested Execution Date
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context['now'].strftime("%Y-%m-%d")
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),
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E.Dbtr( # Debtor
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E.Nm(context['name'])
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),
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E.DbtrAcct( # Debtor Account
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E.Id(
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E.IBAN(context['iban'])
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)
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),
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E.DbtrAgt( # Debtor Agent
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E.FinInstnId( # Financial Institution Id
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E.BIC(context['bic'])
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)
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),
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*list(cls.get_credit_transactions(transactions, process)) # Transactions
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)
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)
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)
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file_name = 'credit-transfer-%i.xml' % process.id
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cls.process_xml(sepa, 'pain.001.001.03.xsd', file_name, process)
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return process
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@classmethod
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def process_debts(cls, transactions):
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from ..models import TransactionProcess
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process = TransactionProcess.objects.create()
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context = cls.get_context(transactions)
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sepa = lxml.builder.ElementMaker(
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nsmap = {
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'xsi': 'http://www.w3.org/2001/XMLSchema-instance',
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None: 'urn:iso:std:iso:20022:tech:xsd:pain.008.001.02',
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}
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)
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sepa = sepa.Document(
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E.CstmrDrctDbtInitn(
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cls.get_header(context, process),
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E.PmtInf( # Payment Info
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E.PmtInfId(str(process.id)), # Payment Id
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E.PmtMtd("DD"), # Payment Method
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E.NbOfTxs(context['num_transactions']), # Number of Transactions
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E.CtrlSum(context['total']), # Control Sum
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E.PmtTpInf( # Payment Type Info
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E.SvcLvl( # Service Level
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E.Cd("SEPA") # Code
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),
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E.LclInstrm( # Local Instrument
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E.Cd("CORE") # Code
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),
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E.SeqTp("RCUR") # Sequence Type
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),
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E.ReqdColltnDt( # Requested Collection Date
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context['now'].strftime("%Y-%m-%d")
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),
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E.Cdtr( # Creditor
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E.Nm(context['name'])
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),
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E.CdtrAcct( # Creditor Account
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E.Id(
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E.IBAN(context['iban'])
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)
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),
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E.CdtrAgt( # Creditor Agent
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E.FinInstnId( # Financial Institution Id
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E.BIC(context['bic'])
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)
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),
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*list(cls.get_debt_transactions(transactions, process)) # Transactions
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)
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)
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)
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file_name = 'direct-debit-%i.xml' % process.id
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cls.process_xml(sepa, 'pain.008.001.02.xsd', file_name, process)
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return process
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@classmethod
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def get_context(cls, transactions):
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return {
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'name': settings.PAYMENTS_DD_CREDITOR_NAME,
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'iban': settings.PAYMENTS_DD_CREDITOR_IBAN,
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'bic': settings.PAYMENTS_DD_CREDITOR_BIC,
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'at02_id': settings.PAYMENTS_DD_CREDITOR_AT02_ID,
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'now': timezone.now(),
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'total': str(sum([abs(transaction.amount) for transaction in transactions])),
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'num_transactions': str(len(transactions)),
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}
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@classmethod
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def get_debt_transactions(cls, transactions, process):
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for transaction in transactions:
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transaction.process = process
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account = transaction.account
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data = transaction.source.data
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transaction.state = transaction.WAITTING_CONFIRMATION
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transaction.save()
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yield E.DrctDbtTxInf( # Direct Debit Transaction Info
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E.PmtId( # Payment Id
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E.EndToEndId(str(transaction.id)) # Payment Id/End to End
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),
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E.InstdAmt( # Instructed Amount
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str(abs(transaction.amount)),
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Ccy=transaction.currency.upper()
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),
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E.DrctDbtTx( # Direct Debit Transaction
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E.MndtRltdInf( # Mandate Related Info
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E.MndtId(str(account.id)), # Mandate Id
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E.DtOfSgntr( # Date of Signature
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account.register_date.strftime("%Y-%m-%d")
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)
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)
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),
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E.DbtrAgt( # Debtor Agent
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E.FinInstnId( # Financial Institution Id
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E.Othr(
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E.Id('NOTPROVIDED')
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)
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)
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),
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E.Dbtr( # Debtor
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E.Nm(account.name), # Name
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),
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E.DbtrAcct( # Debtor Account
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E.Id(
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E.IBAN(data['iban'])
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),
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),
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)
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@classmethod
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def get_credit_transactions(transactions, process):
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for transaction in transactions:
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transaction.process = process
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account = transaction.account
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data = transaction.source.data
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transaction.state = transaction.WAITTING_CONFIRMATION
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transaction.save()
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yield E.CdtTrfTxInf( # Credit Transfer Transaction Info
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E.PmtId( # Payment Id
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E.EndToEndId(str(transaction.id)) # Payment Id/End to End
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),
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E.Amt( # Amount
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E.InstdAmt( # Instructed Amount
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str(abs(transaction.amount)),
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Ccy=transaction.currency.upper()
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)
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),
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E.CdtrAgt( # Creditor Agent
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E.FinInstnId( # Financial Institution Id
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E.Othr(
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E.Id('NOTPROVIDED')
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)
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)
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),
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E.Cdtr( # Debtor
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E.Nm(account.name), # Name
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),
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E.CdtrAcct( # Creditor Account
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E.Id(
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E.IBAN(data['iban'])
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),
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),
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)
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@classmethod
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def get_header(cls, context, process):
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return E.GrpHdr( # Group Header
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E.MsgId(str(process.id)), # Message Id
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E.CreDtTm( # Creation Date Time
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context['now'].strftime("%Y-%m-%dT%H:%M:%S")
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),
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E.NbOfTxs(context['num_transactions']), # Number of Transactions
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E.CtrlSum(context['total']), # Control Sum
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E.InitgPty( # Initiating Party
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E.Nm(context['name']), # Name
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E.Id( # Identification
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E.OrgId( # Organisation Id
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E.Othr(
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E.Id(context['at02_id'])
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)
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)
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)
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)
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)
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@classmethod
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def process_xml(cls, sepa, xsd, file_name, process):
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# http://www.iso20022.org/documents/messages/1_0_version/pain/schemas/pain.008.001.02.zip
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path = os.path.dirname(os.path.realpath(__file__))
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xsd_path = os.path.join(path, xsd)
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schema_doc = etree.parse(xsd_path)
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schema = etree.XMLSchema(schema_doc)
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sepa = etree.parse(StringIO(etree.tostring(sepa)))
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schema.assertValid(sepa)
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process.file = file_name
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process.save()
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sepa.write(process.file.path,
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pretty_print=True,
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xml_declaration=True,
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encoding='UTF-8')
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