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Invoicing: Allow to show exchange rates based on sources/rules (#3122)
This commit is contained in:
Raphael Michel
145
src/pretix/base/services/currencies.py
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145
src/pretix/base/services/currencies.py
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#
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# This file is part of pretix (Community Edition).
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#
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# Copyright (C) 2014-2020 Raphael Michel and contributors
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# Copyright (C) 2020-2021 rami.io GmbH and contributors
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#
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# This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
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# Public License as published by the Free Software Foundation in version 3 of the License.
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#
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# ADDITIONAL TERMS APPLY: Pursuant to Section 7 of the GNU Affero General Public License, additional terms are
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# applicable granting you additional permissions and placing additional restrictions on your usage of this software.
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# Please refer to the pretix LICENSE file to obtain the full terms applicable to this work. If you did not receive
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# this file, see <https://pretix.eu/about/en/license>.
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#
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# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Affero General Public License along with this program. If not, see
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# <https://www.gnu.org/licenses/>.
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#
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from datetime import date, datetime, timedelta
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from decimal import Decimal
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import requests
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from django.conf import settings
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from django.db.models import Max
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from django.dispatch import receiver
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from django.utils.translation import gettext_lazy as _
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from lxml import etree
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from pretix.base.models import ExchangeRate
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from pretix.base.signals import periodic_task
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from pretix.celery_app import app
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SOURCE_NAMES = {
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None: _('European Central Bank'), # backwards-compatibility
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'eu:ecb:eurofxref-daily': _('European Central Bank'),
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'cz:cnb:rate-fixing-daily': _('Czech National Bank'),
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}
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@receiver(signal=periodic_task)
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def fetch_rates(sender, **kwargs):
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if not settings.FETCH_ECB_RATES:
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return
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source_tasks = {
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'eu:ecb:eurofxref-daily': fetch_ecb_rates,
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'cz:cnb:rate-fixing-daily': fetch_cnb_cz_rates,
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}
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for source_name, task in source_tasks.items():
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last_source_date = ExchangeRate.objects.filter(source=source_name).aggregate(m=Max('source_date'))['m']
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if last_source_date and last_source_date >= date.today():
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# We assume that the rates we fetch are only updated daily
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continue
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last_fetch_date = ExchangeRate.objects.filter(source=source_name).aggregate(m=Max('updated'))['m']
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if last_fetch_date and last_fetch_date >= datetime.utcnow() - timedelta(hours=1):
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# Only try to fetch once per hour
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continue
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# Today's rate not yet published, let's try to fetch it
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task.apply_async()
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@app.task()
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def fetch_ecb_rates():
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"""
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Fetches currency rates from the European Central Bank.
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"""
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d = 'https://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml'
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r = requests.get(d)
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r.raise_for_status()
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# File looks like this:
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# <?xml version="1.0" encoding="UTF-8"?>
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# <gesmes:Envelope xmlns:gesmes="http://www.gesmes.org/xml/2002-08-01"
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# xmlns="http://www.ecb.int/vocabulary/2002-08-01/eurofxref">
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# <gesmes:subject>Reference rates</gesmes:subject>
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# <gesmes:Sender>
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# <gesmes:name>European Central Bank</gesmes:name>
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# </gesmes:Sender>
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# <Cube>
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# <Cube time="2023-02-14">
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# <Cube currency="USD" rate="1.0759"/>
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# ...
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# </Cube>
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# </Cube>
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# </gesmes:Envelope>
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root = etree.fromstring(r.content)
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namespaces = {
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'gesmes': 'http://www.gesmes.org/xml/2002-08-01',
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'eurofxref': 'http://www.ecb.int/vocabulary/2002-08-01/eurofxref'
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}
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outercube = root.xpath('./eurofxref:Cube/eurofxref:Cube[@time]', namespaces=namespaces)[0]
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source_date = date.fromisoformat(outercube.get("time"))
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for cube in outercube.xpath('./eurofxref:Cube[@currency][@rate]', namespaces=namespaces):
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currency = cube.get('currency')
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rate = Decimal(cube.get('rate'))
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ExchangeRate.objects.update_or_create(
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source='eu:ecb:eurofxref-daily',
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source_currency='EUR',
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other_currency=currency,
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defaults=dict(
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source_date=source_date,
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rate=rate,
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)
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)
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@app.task()
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def fetch_cnb_cz_rates():
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"""
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Fetches currency rates from the Czech National Bank.
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"""
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d = f'https://www.cnb.cz/en/financial-markets/foreign-exchange-market/central-bank-exchange-rate-fixing/' \
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f'central-bank-exchange-rate-fixing/daily.txt?date={date.today().strftime("%d.%m.%Y")}'
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r = requests.get(d)
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r.raise_for_status()
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lines = r.text.splitlines()
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# File looks like this:
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# 14 Feb 2023 #32
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# Country|Currency|Amount|Code|Rate
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# Australia|dollar|1|AUD|15.412
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source_date = datetime.strptime(lines[0].split("#")[0].strip(), "%d %b %Y").date()
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for line in lines[2:]:
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country, currency, amount, code, rate = line.split("|")
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rate = Decimal(rate).quantize(Decimal('0.000001')) / int(amount)
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ExchangeRate.objects.update_or_create(
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source='cz:cnb:rate-fixing-daily',
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source_currency=code,
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other_currency='CZK',
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defaults=dict(
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source_date=source_date,
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rate=rate,
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)
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)
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@@ -33,16 +33,12 @@
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# License for the specific language governing permissions and limitations under the License.
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import inspect
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import json
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import logging
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import urllib.error
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from datetime import date, timedelta
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from datetime import timedelta
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from decimal import ROUND_HALF_UP, Decimal
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import vat_moss.exchange_rates
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from django.conf import settings
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from django.core.files.base import ContentFile
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from django.core.serializers.json import DjangoJSONEncoder
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from django.db import connection, transaction
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from django.db.models import Count
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from django.dispatch import receiver
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@@ -56,11 +52,10 @@ from i18nfield.strings import LazyI18nString
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from pretix.base.i18n import language
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from pretix.base.models import (
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Invoice, InvoiceAddress, InvoiceLine, Order, OrderFee,
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ExchangeRate, Invoice, InvoiceAddress, InvoiceLine, Order, OrderFee,
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)
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from pretix.base.models.tax import EU_CURRENCIES
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from pretix.base.services.tasks import TransactionAwareTask
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from pretix.base.settings import GlobalSettingsObject
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from pretix.base.signals import invoice_line_text, periodic_task
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from pretix.celery_app import app
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from pretix.helpers.database import OF_SELF, rolledback_transaction
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@@ -144,27 +139,54 @@ def build_invoice(invoice: Invoice) -> Invoice:
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invoice.invoice_to += "\n" + pgettext("invoice", "VAT-ID: %s") % ia.vat_id
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invoice.invoice_to_vat_id = ia.vat_id
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cc = str(ia.country)
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if cc in EU_CURRENCIES and EU_CURRENCIES[cc] != invoice.event.currency and invoice.event.settings.invoice_eu_currencies:
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invoice.foreign_currency_display = EU_CURRENCIES[cc]
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if invoice.event.settings.invoice_eu_currencies == 'True':
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cc = str(ia.country)
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if cc in EU_CURRENCIES and EU_CURRENCIES[cc] != invoice.event.currency:
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invoice.foreign_currency_display = EU_CURRENCIES[cc]
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if settings.FETCH_ECB_RATES:
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rate = ExchangeRate.objects.filter(
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source='eu:ecb:eurofxref-daily',
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source_currency=invoice.event.currency,
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other_currency=invoice.foreign_currency_display,
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source_date__gt=now().date() - timedelta(days=7)
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).first()
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if rate:
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invoice.foreign_currency_rate = rate.rate.quantize(Decimal('0.0001'), ROUND_HALF_UP)
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invoice.foreign_currency_rate_date = rate.source_date
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invoice.foreign_currency_source = 'eu:ecb:eurofxref-daily'
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else:
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rate_eur_to_event = ExchangeRate.objects.filter(
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source='eu:ecb:eurofxref-daily',
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source_currency='EUR',
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other_currency=invoice.event.currency,
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source_date__gt=now().date() - timedelta(days=7)
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).first()
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rate_eur_to_wanted = ExchangeRate.objects.filter(
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source='eu:ecb:eurofxref-daily',
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source_currency='EUR',
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other_currency=invoice.foreign_currency_display,
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source_date__gt=now().date() - timedelta(days=7)
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).first()
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if rate_eur_to_wanted and rate_eur_to_event:
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invoice.foreign_currency_rate = (
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rate_eur_to_wanted.rate / rate_eur_to_event.rate
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).quantize(Decimal('0.0001'), ROUND_HALF_UP)
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invoice.foreign_currency_rate_date = min(rate_eur_to_wanted.source_date, rate_eur_to_event.source_date)
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invoice.foreign_currency_source = 'eu:ecb:eurofxref-daily'
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elif invoice.event.settings.invoice_eu_currencies == 'CZK' and invoice.event.currency != 'CZK':
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invoice.foreign_currency_display = 'CZK'
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if settings.FETCH_ECB_RATES:
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gs = GlobalSettingsObject()
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rates_date = gs.settings.get('ecb_rates_date', as_type=date)
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rates_dict = gs.settings.get('ecb_rates_dict', as_type=dict)
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convert = (
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rates_date and rates_dict and
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rates_date > (now() - timedelta(days=7)).date() and
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invoice.event.currency in rates_dict and
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invoice.foreign_currency_display in rates_dict
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)
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if convert:
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invoice.foreign_currency_rate = (
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Decimal(rates_dict[invoice.foreign_currency_display])
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/ Decimal(rates_dict[invoice.event.currency])
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).quantize(Decimal('0.0001'), ROUND_HALF_UP)
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invoice.foreign_currency_rate_date = rates_date
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rate = ExchangeRate.objects.filter(
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source='cz:cnb:rate-fixing-daily',
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source_currency=invoice.event.currency,
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other_currency=invoice.foreign_currency_display,
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source_date__gt=now().date() - timedelta(days=7)
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).first()
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if rate:
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invoice.foreign_currency_rate = rate.rate.quantize(Decimal('0.0001'), ROUND_HALF_UP)
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invoice.foreign_currency_rate_date = rate.source_date
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invoice.foreign_currency_source = 'cz:cnb:rate-fixing-daily'
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except InvoiceAddress.DoesNotExist:
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ia = None
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@@ -474,23 +496,6 @@ def build_preview_invoice_pdf(event):
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return event.invoice_renderer.generate(invoice)
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@receiver(signal=periodic_task)
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def fetch_ecb_rates(sender, **kwargs):
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if not settings.FETCH_ECB_RATES:
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return
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gs = GlobalSettingsObject()
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if gs.settings.ecb_rates_date == now().strftime("%Y-%m-%d"):
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return
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try:
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date, rates = vat_moss.exchange_rates.fetch()
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gs.settings.ecb_rates_date = date
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gs.settings.ecb_rates_dict = json.dumps(rates, cls=DjangoJSONEncoder)
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except urllib.error.URLError:
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logger.exception('Could not retrieve rates from ECB')
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@receiver(signal=periodic_task)
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@scopes_disabled()
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def send_invoices_to_organizer(sender, **kwargs):
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