452 lines
18 KiB
Python
452 lines
18 KiB
Python
# /home/Autopartes/pos/services/cfdi_builder.py
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"""CFDI 4.0 XML builder using lxml.
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Builds unsigned CFDI XML documents for:
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- Ingreso (sale invoice)
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- Egreso (credit note / refund)
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- Pago (payment complement for credit sales)
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The unsigned XML is sent to Horux360 for CSD signing and PAC timbrado.
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All XML follows the SAT CFDI 4.0 schema:
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http://www.sat.gob.mx/cfd/4
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CFDI 4.0 mandatory fields handled:
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- Version="4.0"
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- Exportacion="01" (no aplica)
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- ObjetoImp="02" (si, objeto de impuesto) on each Concepto
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- InformacionGlobal for publico general (RFC: XAXX010101000)
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- Emisor: Rfc, Nombre, RegimenFiscal
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- Receptor: Rfc, Nombre, RegimenFiscalReceptor, UsoCFDI, DomicilioFiscalReceptor
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"""
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from datetime import datetime
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from decimal import Decimal, ROUND_HALF_UP
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from lxml import etree
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# SAT XML namespaces
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CFDI_NS = 'http://www.sat.gob.mx/cfd/4'
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PAGO_NS = 'http://www.sat.gob.mx/Pagos20'
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XSI_NS = 'http://www.w3.org/2001/XMLSchema-instance'
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CFDI_SCHEMA_LOCATION = (
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'http://www.sat.gob.mx/cfd/4 '
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'http://www.sat.gob.mx/sitio_internet/cfd/4/cfdv40.xsd'
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)
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PAGO_SCHEMA_LOCATION = (
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'http://www.sat.gob.mx/Pagos20 '
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'http://www.sat.gob.mx/sitio_internet/cfd/Pagos/Pagos20.xsd'
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)
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# RFC for publico en general
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RFC_PUBLICO_GENERAL = 'XAXX010101000'
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# RFC for foreign customers
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RFC_EXTRANJERO = 'XEXX010101000'
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def _to_dec(val):
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if val is None:
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return Decimal('0')
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return Decimal(str(val))
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TWO = Decimal('0.01')
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SIX = Decimal('0.000001')
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def _format_amount(val):
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"""Format a Decimal to 2 decimal places as string."""
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return str(_to_dec(val).quantize(TWO, ROUND_HALF_UP))
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def _format_rate(val):
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"""Format a tax rate to 6 decimal places as string."""
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return str(_to_dec(val).quantize(SIX, ROUND_HALF_UP))
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def _make_element(parent, tag, attribs=None, ns=CFDI_NS):
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"""Create a subelement with the given namespace."""
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elem = etree.SubElement(parent, f'{{{ns}}}{tag}')
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if attribs:
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for k, v in attribs.items():
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if v is not None:
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elem.set(k, str(v))
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return elem
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def build_ingreso_xml(sale, tenant_config, customer=None):
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"""Build CFDI 4.0 XML for a sale (Comprobante tipo Ingreso).
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Args:
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sale: dict with keys:
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id, subtotal, discount_total, tax_total, total, created_at,
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metodo_pago_sat ('PUE'|'PPD'), forma_pago_sat ('01'|'03'|'04'|'99'),
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items: [{part_number, name, quantity, unit_price, discount_amount,
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tax_rate, tax_amount, subtotal,
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clave_prod_serv, clave_unidad}]
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tenant_config: dict with keys:
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rfc, razon_social, regimen_fiscal, cp (codigo postal),
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serie (optional), nombre_comercial (optional)
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customer: dict or None with keys:
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rfc, razon_social, regimen_fiscal, uso_cfdi, cp
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If None, generates factura a publico general.
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Returns:
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str: XML string (unsigned, ready for Horux)
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"""
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nsmap = {
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'cfdi': CFDI_NS,
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'xsi': XSI_NS,
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}
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# Root: Comprobante
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root = etree.Element(f'{{{CFDI_NS}}}Comprobante', nsmap=nsmap)
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root.set(f'{{{XSI_NS}}}schemaLocation', CFDI_SCHEMA_LOCATION)
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root.set('Version', '4.0')
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root.set('Serie', tenant_config.get('serie', 'A'))
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root.set('Folio', str(sale['id']))
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root.set('Fecha', datetime.now().strftime('%Y-%m-%dT%H:%M:%S'))
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root.set('FormaPago', sale.get('forma_pago_sat', '01'))
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root.set('SubTotal', _format_amount(sale['subtotal']))
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discount_total = _to_dec(sale.get('discount_total', 0))
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if discount_total > 0:
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root.set('Descuento', _format_amount(discount_total))
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root.set('Moneda', 'MXN')
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root.set('Total', _format_amount(sale['total']))
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root.set('TipoDeComprobante', 'I') # Ingreso
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root.set('Exportacion', '01') # No aplica
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root.set('MetodoPago', sale.get('metodo_pago_sat', 'PUE'))
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root.set('LugarExpedicion', tenant_config.get('cp', '00000'))
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# InformacionGlobal (required for publico general)
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is_publico_general = (customer is None or
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customer.get('rfc') in (None, '', RFC_PUBLICO_GENERAL))
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if is_publico_general:
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info_global = _make_element(root, 'InformacionGlobal')
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info_global.set('Periodicidad', '01') # Diario
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now = datetime.now()
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info_global.set('Meses', f'{now.month:02d}')
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info_global.set('Anio', str(now.year))
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# Emisor
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emisor = _make_element(root, 'Emisor')
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emisor.set('Rfc', tenant_config['rfc'])
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emisor.set('Nombre', tenant_config['razon_social'])
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emisor.set('RegimenFiscal', tenant_config.get('regimen_fiscal', '601'))
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# Receptor
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receptor = _make_element(root, 'Receptor')
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if is_publico_general:
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receptor.set('Rfc', RFC_PUBLICO_GENERAL)
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receptor.set('Nombre', 'PUBLICO EN GENERAL')
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receptor.set('DomicilioFiscalReceptor', tenant_config.get('cp', '00000'))
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receptor.set('RegimenFiscalReceptor', '616') # Sin obligaciones fiscales
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receptor.set('UsoCFDI', 'S01') # Sin efectos fiscales
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else:
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receptor.set('Rfc', customer['rfc'])
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receptor.set('Nombre', customer.get('razon_social', customer.get('name', '')))
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receptor.set('DomicilioFiscalReceptor', customer.get('cp', '00000'))
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receptor.set('RegimenFiscalReceptor', customer.get('regimen_fiscal', '616'))
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receptor.set('UsoCFDI', customer.get('uso_cfdi', 'G03'))
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# Conceptos
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conceptos = _make_element(root, 'Conceptos')
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for item in sale.get('items', []):
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qty = int(item.get('quantity', 1))
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unit_price = _to_dec(item.get('unit_price', 0))
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discount_amount = _to_dec(item.get('discount_amount', 0))
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tax_rate = _to_dec(item.get('tax_rate', '0.16'))
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tax_amount = _to_dec(item.get('tax_amount', 0))
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# Importe = qty * unit_price (before discount)
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importe = (unit_price * qty).quantize(TWO, ROUND_HALF_UP)
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# Base for tax = importe - discount
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base = (importe - discount_amount).quantize(TWO, ROUND_HALF_UP)
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concepto = _make_element(conceptos, 'Concepto')
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concepto.set('ClaveProdServ', item.get('clave_prod_serv', '25174800')) # Default: autopartes
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concepto.set('NoIdentificacion', item.get('part_number', ''))
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concepto.set('Cantidad', str(qty))
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concepto.set('ClaveUnidad', item.get('clave_unidad', 'H87')) # H87 = Pieza
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concepto.set('Unidad', 'PZA')
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concepto.set('Descripcion', item.get('name', 'Autoparte'))
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concepto.set('ValorUnitario', _format_amount(unit_price))
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concepto.set('Importe', _format_amount(importe))
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concepto.set('ObjetoImp', '02') # Si objeto de impuesto
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if discount_amount > 0:
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concepto.set('Descuento', _format_amount(discount_amount))
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# Impuestos del concepto
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impuestos_concepto = _make_element(concepto, 'Impuestos')
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traslados_concepto = _make_element(impuestos_concepto, 'Traslados')
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traslado = _make_element(traslados_concepto, 'Traslado')
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traslado.set('Base', _format_amount(base))
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traslado.set('Impuesto', '002') # IVA
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traslado.set('TipoFactor', 'Tasa')
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traslado.set('TasaOCuota', _format_rate(tax_rate))
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traslado.set('Importe', _format_amount(tax_amount))
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# Impuestos totales
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impuestos = _make_element(root, 'Impuestos')
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impuestos.set('TotalImpuestosTrasladados', _format_amount(sale['tax_total']))
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traslados = _make_element(impuestos, 'Traslados')
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traslado_total = _make_element(traslados, 'Traslado')
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traslado_total.set('Base', _format_amount(sale['subtotal']))
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traslado_total.set('Impuesto', '002')
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traslado_total.set('TipoFactor', 'Tasa')
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traslado_total.set('TasaOCuota', '0.160000')
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traslado_total.set('Importe', _format_amount(sale['tax_total']))
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return etree.tostring(root, xml_declaration=True, encoding='UTF-8',
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pretty_print=True).decode('utf-8')
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def build_egreso_xml(sale, tenant_config, customer, original_uuid):
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"""Build CFDI 4.0 XML for a credit note (Comprobante tipo Egreso).
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Used for cancellations or returns that require a nota de credito.
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Args:
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sale: same as build_ingreso_xml
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tenant_config: same as build_ingreso_xml
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customer: same as build_ingreso_xml
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original_uuid: str UUID of the original CFDI being credited
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Returns:
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str: XML string
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"""
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nsmap = {
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'cfdi': CFDI_NS,
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'xsi': XSI_NS,
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}
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root = etree.Element(f'{{{CFDI_NS}}}Comprobante', nsmap=nsmap)
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root.set(f'{{{XSI_NS}}}schemaLocation', CFDI_SCHEMA_LOCATION)
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root.set('Version', '4.0')
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root.set('Serie', 'NC')
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root.set('Folio', str(sale['id']))
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root.set('Fecha', datetime.now().strftime('%Y-%m-%dT%H:%M:%S'))
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root.set('FormaPago', sale.get('forma_pago_sat', '01'))
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root.set('SubTotal', _format_amount(sale['subtotal']))
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discount_total = _to_dec(sale.get('discount_total', 0))
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if discount_total > 0:
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root.set('Descuento', _format_amount(discount_total))
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root.set('Moneda', 'MXN')
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root.set('Total', _format_amount(sale['total']))
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root.set('TipoDeComprobante', 'E') # Egreso
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root.set('Exportacion', '01')
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root.set('MetodoPago', 'PUE')
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root.set('LugarExpedicion', tenant_config.get('cp', '00000'))
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# CfdiRelacionados - references the original CFDI
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cfdi_relacionados = _make_element(root, 'CfdiRelacionados')
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cfdi_relacionados.set('TipoRelacion', '01') # Nota de credito
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cfdi_relacionado = _make_element(cfdi_relacionados, 'CfdiRelacionado')
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cfdi_relacionado.set('UUID', original_uuid)
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# Emisor
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emisor = _make_element(root, 'Emisor')
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emisor.set('Rfc', tenant_config['rfc'])
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emisor.set('Nombre', tenant_config['razon_social'])
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emisor.set('RegimenFiscal', tenant_config.get('regimen_fiscal', '601'))
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# Receptor
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is_publico_general = (customer is None or
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customer.get('rfc') in (None, '', RFC_PUBLICO_GENERAL))
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receptor = _make_element(root, 'Receptor')
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if is_publico_general:
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receptor.set('Rfc', RFC_PUBLICO_GENERAL)
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receptor.set('Nombre', 'PUBLICO EN GENERAL')
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receptor.set('DomicilioFiscalReceptor', tenant_config.get('cp', '00000'))
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receptor.set('RegimenFiscalReceptor', '616')
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receptor.set('UsoCFDI', 'S01')
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else:
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receptor.set('Rfc', customer['rfc'])
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receptor.set('Nombre', customer.get('razon_social', customer.get('name', '')))
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receptor.set('DomicilioFiscalReceptor', customer.get('cp', '00000'))
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receptor.set('RegimenFiscalReceptor', customer.get('regimen_fiscal', '616'))
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receptor.set('UsoCFDI', customer.get('uso_cfdi', 'G03'))
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# Conceptos (same as ingreso but for the credited amounts)
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conceptos = _make_element(root, 'Conceptos')
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for item in sale.get('items', []):
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qty = int(item.get('quantity', 1))
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unit_price = _to_dec(item.get('unit_price', 0))
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discount_amount = _to_dec(item.get('discount_amount', 0))
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tax_rate = _to_dec(item.get('tax_rate', '0.16'))
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tax_amount = _to_dec(item.get('tax_amount', 0))
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importe = (unit_price * qty).quantize(TWO, ROUND_HALF_UP)
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base = (importe - discount_amount).quantize(TWO, ROUND_HALF_UP)
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concepto = _make_element(conceptos, 'Concepto')
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concepto.set('ClaveProdServ', item.get('clave_prod_serv', '25174800'))
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concepto.set('NoIdentificacion', item.get('part_number', ''))
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concepto.set('Cantidad', str(qty))
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concepto.set('ClaveUnidad', item.get('clave_unidad', 'H87'))
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concepto.set('Unidad', 'PZA')
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concepto.set('Descripcion', item.get('name', 'Autoparte'))
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concepto.set('ValorUnitario', _format_amount(unit_price))
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concepto.set('Importe', _format_amount(importe))
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concepto.set('ObjetoImp', '02')
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if discount_amount > 0:
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concepto.set('Descuento', _format_amount(discount_amount))
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impuestos_concepto = _make_element(concepto, 'Impuestos')
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traslados_concepto = _make_element(impuestos_concepto, 'Traslados')
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traslado = _make_element(traslados_concepto, 'Traslado')
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traslado.set('Base', _format_amount(base))
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traslado.set('Impuesto', '002')
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traslado.set('TipoFactor', 'Tasa')
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traslado.set('TasaOCuota', _format_rate(tax_rate))
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traslado.set('Importe', _format_amount(tax_amount))
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# Impuestos totales
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impuestos = _make_element(root, 'Impuestos')
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impuestos.set('TotalImpuestosTrasladados', _format_amount(sale['tax_total']))
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traslados = _make_element(impuestos, 'Traslados')
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traslado_total = _make_element(traslados, 'Traslado')
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traslado_total.set('Base', _format_amount(sale['subtotal']))
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traslado_total.set('Impuesto', '002')
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traslado_total.set('TipoFactor', 'Tasa')
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traslado_total.set('TasaOCuota', '0.160000')
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traslado_total.set('Importe', _format_amount(sale['tax_total']))
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return etree.tostring(root, xml_declaration=True, encoding='UTF-8',
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pretty_print=True).decode('utf-8')
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def build_pago_xml(payment, tenant_config, customer, original_uuid):
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"""Build CFDI 4.0 XML with Complemento de Pago 2.0.
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Used for credit sale payments (MetodoPago PPD). When a customer
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pays an outstanding credit sale, this generates the payment complement.
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Args:
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payment: dict with keys:
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id, amount, payment_method ('efectivo'|'transferencia'|'tarjeta'),
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date (ISO string), reference (optional)
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tenant_config: same as build_ingreso_xml
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customer: dict with RFC data
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original_uuid: str UUID of the original CFDI (Ingreso with PPD)
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Returns:
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str: XML string
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"""
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nsmap = {
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'cfdi': CFDI_NS,
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'pago20': PAGO_NS,
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'xsi': XSI_NS,
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}
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forma_pago_map = {
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'efectivo': '01', 'transferencia': '03', 'tarjeta': '04', 'mixto': '99'
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}
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root = etree.Element(f'{{{CFDI_NS}}}Comprobante', nsmap=nsmap)
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root.set(f'{{{XSI_NS}}}schemaLocation',
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f'{CFDI_SCHEMA_LOCATION} {PAGO_SCHEMA_LOCATION}')
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root.set('Version', '4.0')
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root.set('Serie', 'P')
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root.set('Folio', str(payment.get('id', '')))
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root.set('Fecha', datetime.now().strftime('%Y-%m-%dT%H:%M:%S'))
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root.set('SubTotal', '0')
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root.set('Moneda', 'XXX') # Required for Pago type
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root.set('Total', '0')
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root.set('TipoDeComprobante', 'P') # Pago
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root.set('Exportacion', '01')
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root.set('LugarExpedicion', tenant_config.get('cp', '00000'))
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# Emisor
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emisor = _make_element(root, 'Emisor')
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emisor.set('Rfc', tenant_config['rfc'])
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emisor.set('Nombre', tenant_config['razon_social'])
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emisor.set('RegimenFiscal', tenant_config.get('regimen_fiscal', '601'))
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# Receptor
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receptor = _make_element(root, 'Receptor')
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receptor.set('Rfc', customer['rfc'])
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receptor.set('Nombre', customer.get('razon_social', customer.get('name', '')))
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receptor.set('DomicilioFiscalReceptor', customer.get('cp', '00000'))
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receptor.set('RegimenFiscalReceptor', customer.get('regimen_fiscal', '616'))
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receptor.set('UsoCFDI', 'CP01') # Pagos
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# Conceptos (mandatory placeholder for Pago type)
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conceptos = _make_element(root, 'Conceptos')
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concepto = _make_element(conceptos, 'Concepto')
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concepto.set('ClaveProdServ', '84111506') # Servicios de facturacion
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concepto.set('Cantidad', '1')
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concepto.set('ClaveUnidad', 'ACT') # Actividad
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concepto.set('Descripcion', 'Pago')
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concepto.set('ValorUnitario', '0')
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concepto.set('Importe', '0')
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concepto.set('ObjetoImp', '01') # No objeto de impuesto
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# Complemento de Pago 2.0
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complemento = _make_element(root, 'Complemento')
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pagos_elem = etree.SubElement(complemento, f'{{{PAGO_NS}}}Pagos')
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pagos_elem.set('Version', '2.0')
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# Totales
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totales = etree.SubElement(pagos_elem, f'{{{PAGO_NS}}}Totales')
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amount = _to_dec(payment['amount'])
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# Calculate base and IVA from total (total includes 16% IVA)
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base_pago = (amount / Decimal('1.16')).quantize(TWO, ROUND_HALF_UP)
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iva_pago = (amount - base_pago).quantize(TWO, ROUND_HALF_UP)
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totales.set('TotalTrasladosBaseIVA16', _format_amount(base_pago))
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totales.set('TotalTrasladosImpuestoIVA16', _format_amount(iva_pago))
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totales.set('MontoTotalPagos', _format_amount(amount))
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# Pago
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pago = etree.SubElement(pagos_elem, f'{{{PAGO_NS}}}Pago')
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payment_date = payment.get('date', datetime.now().strftime('%Y-%m-%dT%H:%M:%S'))
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pago.set('FechaPago', payment_date if 'T' in str(payment_date)
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else f'{payment_date}T12:00:00')
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pago.set('FormaDePagoP', forma_pago_map.get(payment.get('payment_method', 'efectivo'), '01'))
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pago.set('MonedaP', 'MXN')
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pago.set('Monto', _format_amount(amount))
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|
|
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# DoctoRelacionado (the original invoice being paid)
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docto = etree.SubElement(pago, f'{{{PAGO_NS}}}DoctoRelacionado')
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docto.set('IdDocumento', original_uuid)
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docto.set('Serie', 'A')
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docto.set('Folio', str(payment.get('sale_id', '')))
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docto.set('MonedaDR', 'MXN')
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docto.set('NumParcialidad', str(payment.get('num_parcialidad', 1)))
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docto.set('ImpSaldoAnt', _format_amount(payment.get('saldo_anterior', amount)))
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docto.set('ImpPagado', _format_amount(amount))
|
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saldo_insoluto = _to_dec(payment.get('saldo_anterior', amount)) - amount
|
|
docto.set('ImpSaldoInsoluto', _format_amount(max(saldo_insoluto, Decimal('0'))))
|
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docto.set('ObjetoImpDR', '02')
|
|
docto.set('EquivalenciaDR', '1')
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|
|
|
# ImpuestosDR
|
|
impuestos_dr = etree.SubElement(docto, f'{{{PAGO_NS}}}ImpuestosDR')
|
|
traslados_dr = etree.SubElement(impuestos_dr, f'{{{PAGO_NS}}}TrasladosDR')
|
|
traslado_dr = etree.SubElement(traslados_dr, f'{{{PAGO_NS}}}TrasladoDR')
|
|
traslado_dr.set('BaseDR', _format_amount(base_pago))
|
|
traslado_dr.set('ImpuestoDR', '002')
|
|
traslado_dr.set('TipoFactorDR', 'Tasa')
|
|
traslado_dr.set('TasaOCuotaDR', '0.160000')
|
|
traslado_dr.set('ImporteDR', _format_amount(iva_pago))
|
|
|
|
# ImpuestosP (pago-level taxes)
|
|
impuestos_p = etree.SubElement(pago, f'{{{PAGO_NS}}}ImpuestosP')
|
|
traslados_p = etree.SubElement(impuestos_p, f'{{{PAGO_NS}}}TrasladosP')
|
|
traslado_p = etree.SubElement(traslados_p, f'{{{PAGO_NS}}}TrasladoP')
|
|
traslado_p.set('BaseP', _format_amount(base_pago))
|
|
traslado_p.set('ImpuestoP', '002')
|
|
traslado_p.set('TipoFactorP', 'Tasa')
|
|
traslado_p.set('TasaOCuotaP', '0.160000')
|
|
traslado_p.set('ImporteP', _format_amount(iva_pago))
|
|
|
|
return etree.tostring(root, xml_declaration=True, encoding='UTF-8',
|
|
pretty_print=True).decode('utf-8')
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