Electronic Document SRI Ecuador

einvoice.py

# -*- coding: utf-8 -*-
##############################################################################
#
#    E-Invoice Module - Ecuador
#    Copyright (C) 2014 VIRTUALSAMI CIA. LTDA. All Rights Reserved
#    alcides@virtualsami.com.ec
#    $Id$
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
##############################################################################

import time
import logging
import base64

from lxml import etree
from xml.dom.minidom import parse, parseString

from osv import osv, fields
from tools import config
from tools.translate import _
from tools import ustr
import decimal_precision as dp
import netsvc

from .xades.sri import Service as SRIService, InvoiceXML
from .xades.xades import Xades

try:
    from suds.client import Client
    from suds.transport import TransportError
except ImportError:
    raise ImportError('Instalar Libreria suds')

tipoIdentificacion = {
    'ruc' : '04',
    'cedula' : '05',
    'pasaporte' : '06',
    'venta_consumidor_final' : '07',
    'identificacion_exterior' : '08',
    'placa' : '09',
}

codigoImpuesto = {
    'vat': '2',
    'vat0': '2',
    'ice': '3',
    'other': '5'
}

tarifaImpuesto = {
    'vat0': '0',
    'vat': '2',
    'novat': '6',
    'other': '7',
}

class AccountInvoice(osv.osv):

    _inherit = 'account.invoice'
    __logger = logging.getLogger(_inherit)
    
    _columns = {
        'clave_acceso': fields.char('Clave de Acceso', size=49, readonly=True, store=True),
        'numero_autorizacion': fields.char('Número de Autorización', size=37, readonly=True, store=True),
        'fecha_autorizacion':  fields.datetime('Fecha y Hora de Autorización', readonly=True, store=True),
        'autorizado_sri': fields.boolean('¿Autorizado SRI?', readonly=True, store=True),
        'security_code': fields.char('Código de Seguridad', size=8),
	'emission_code': fields.char('Tipo de Emisión', size=1),
        }
        
    def get_code(self, cr, uid, invoice):
        """
        TODO: revisar la generacion
        del codigo de 8 digitos
        """
        return self.pool.get('ir.sequence').get_id(cr, uid, 51)

    def _get_tax_element(self, invoice, access_key, emission_code):
        """
        """
        company = invoice.company_id
        auth = invoice.journal_id.auth_id
        infoTributaria = etree.Element('infoTributaria')
        etree.SubElement(infoTributaria, 'ambiente').text = SRIService.get_env_test()
        etree.SubElement(infoTributaria, 'tipoEmision').text = emission_code
        etree.SubElement(infoTributaria, 'razonSocial').text = company.name
        etree.SubElement(infoTributaria, 'nombreComercial').text = company.name
        etree.SubElement(infoTributaria, 'ruc').text = company.partner_id.ced_ruc
        etree.SubElement(infoTributaria, 'claveAcceso').text = access_key
        etree.SubElement(infoTributaria, 'codDoc').text = auth.type_id.code
        etree.SubElement(infoTributaria, 'estab').text = auth.serie_entidad
        etree.SubElement(infoTributaria, 'ptoEmi').text = auth.serie_emision
        etree.SubElement(infoTributaria, 'secuencial').text = invoice.supplier_invoice_number.replace('-','')[6:15]
        etree.SubElement(infoTributaria, 'dirMatriz').text = company.street
        return infoTributaria

    def _get_invoice_element(self, invoice):
        """
        """
        company = invoice.company_id
        partner = invoice.partner_id
        infoFactura = etree.Element('infoFactura')
        etree.SubElement(infoFactura, 'fechaEmision').text = time.strftime('%d/%m/%Y',time.strptime(invoice.date_invoice, '%Y-%m-%d'))
        etree.SubElement(infoFactura, 'dirEstablecimiento').text = company.street2
        etree.SubElement(infoFactura, 'contribuyenteEspecial').text = company.company_registry
        etree.SubElement(infoFactura, 'obligadoContabilidad').text = 'SI'
        etree.SubElement(infoFactura, 'tipoIdentificacionComprador').text = tipoIdentificacion[partner.type_ced_ruc]
        etree.SubElement(infoFactura, 'razonSocialComprador').text = partner.name
        etree.SubElement(infoFactura, 'identificacionComprador').text = partner.ced_ruc
        etree.SubElement(infoFactura, 'totalSinImpuestos').text = '%.2f' % (invoice.amount_untaxed)
        etree.SubElement(infoFactura, 'totalDescuento').text = '%.2f' % (invoice.discount_total)
        
        #totalConImpuestos
        totalConImpuestos = etree.Element('totalConImpuestos')
        for tax in invoice.tax_line:

            if tax.tax_group in ['vat', 'vat0', 'ice', 'other']:
                totalImpuesto = etree.Element('totalImpuesto')
                etree.SubElement(totalImpuesto, 'codigo').text = codigoImpuesto[tax.tax_group]
                etree.SubElement(totalImpuesto, 'codigoPorcentaje').text = tarifaImpuesto[tax.tax_group]
                etree.SubElement(totalImpuesto, 'baseImponible').text = '{:.2f}'.format(tax.base_amount)
                etree.SubElement(totalImpuesto, 'valor').text = '{:.2f}'.format(tax.tax_amount)
                totalConImpuestos.append(totalImpuesto)
                
        infoFactura.append(totalConImpuestos)
        
        etree.SubElement(infoFactura, 'propina').text = '0.00'
        etree.SubElement(infoFactura, 'importeTotal').text = '{:.2f}'.format(invoice.amount_pay)
        etree.SubElement(infoFactura, 'moneda').text = 'DOLAR'
            
        return infoFactura

    def _get_refund_element(self, refund, invoice):
        """
        """
        company = refund.company_id
        partner = refund.partner_id
        infoNotaCredito = etree.Element('infoNotaCredito')
        etree.SubElement(infoNotaCredito, 'fechaEmision').text = time.strftime('%d/%m/%Y',time.strptime(refund.date_invoice, '%Y-%m-%d'))
        etree.SubElement(infoNotaCredito, 'dirEstablecimiento').text = company.street2
        etree.SubElement(infoNotaCredito, 'tipoIdentificacionComprador').text = tipoIdentificacion[partner.type_ced_ruc]
        etree.SubElement(infoNotaCredito, 'razonSocialComprador').text = partner.name
        etree.SubElement(infoNotaCredito, 'identificacionComprador').text = partner.ced_ruc
        etree.SubElement(infoNotaCredito, 'contribuyenteEspecial').text = company.company_registry
        etree.SubElement(infoNotaCredito, 'obligadoContabilidad').text = 'SI'
        etree.SubElement(infoNotaCredito, 'codDocModificado').text = '01'
        etree.SubElement(infoNotaCredito, 'numDocModificado').text = invoice[0].supplier_invoice_number
        etree.SubElement(infoNotaCredito, 'fechaEmisionDocSustento').text = time.strftime('%d/%m/%Y',time.strptime(invoice[0].date_invoice, '%Y-%m-%d'))
        etree.SubElement(infoNotaCredito, 'totalSinImpuestos').text = '%.2f' % (refund.amount_untaxed)
        etree.SubElement(infoNotaCredito, 'valorModificacion').text = '%.2f' % (refund.amount_untaxed)
        etree.SubElement(infoNotaCredito, 'moneda').text = 'DOLAR'
        
        #totalConImpuestos
        totalConImpuestos = etree.Element('totalConImpuestos')
        for tax in refund.tax_line:

            if tax.tax_group in ['vat', 'vat0', 'ice', 'other']:
                totalImpuesto = etree.Element('totalImpuesto')
                etree.SubElement(totalImpuesto, 'codigo').text = codigoImpuesto[tax.tax_group]
                etree.SubElement(totalImpuesto, 'codigoPorcentaje').text = tarifaImpuesto[tax.tax_group]
                etree.SubElement(totalImpuesto, 'baseImponible').text = '{:.2f}'.format(tax.base_amount)
                etree.SubElement(totalImpuesto, 'valor').text = '{:.2f}'.format(tax.tax_amount)
                totalConImpuestos.append(totalImpuesto)
                
        infoNotaCredito.append(totalConImpuestos)
        etree.SubElement(infoNotaCredito, 'motivo').text = refund.origin
        return infoNotaCredito
        
    def _get_detail_element(self, invoice):
        """
        """
        detalles = etree.Element('detalles')
        for line in invoice.invoice_line:
            detalle = etree.Element('detalle')
            etree.SubElement(detalle, 'codigoPrincipal').text = line.product_id.default_code
            if line.product_id.manufacturer_pref:
                etree.SubElement(detalle, 'codigoAuxiliar').text = line.product_id.manufacturer_pref
            etree.SubElement(detalle, 'descripcion').text = line.product_id.name
            etree.SubElement(detalle, 'cantidad').text = '%.6f' % (line.quantity)
            etree.SubElement(detalle, 'precioUnitario').text = '%.6f' % (line.price_unit)
            etree.SubElement(detalle, 'descuento').text = '%.2f' % (line.discount_value)
            etree.SubElement(detalle, 'precioTotalSinImpuesto').text = '%.2f' % (line.price_subtotal)
            impuestos = etree.Element('impuestos')
            for tax_line in line.invoice_line_tax_id:
                if tax_line.tax_group in ['vat', 'vat0', 'ice', 'other']:
                    impuesto = etree.Element('impuesto')
                    etree.SubElement(impuesto, 'codigo').text = codigoImpuesto[tax_line.tax_group]
                    etree.SubElement(impuesto, 'codigoPorcentaje').text = tarifaImpuesto[tax_line.tax_group]
                    etree.SubElement(impuesto, 'tarifa').text = '%.2f' % (tax_line.amount * 100)
                    etree.SubElement(impuesto, 'baseImponible').text = '%.2f' % (line.price_subtotal)
                    etree.SubElement(impuesto, 'valor').text = '%.2f' % (line.amount_tax)
                    impuestos.append(impuesto)
            detalle.append(impuestos)
            detalles.append(detalle)
        return detalles

    def _get_detail_element_refund(self, invoice):
        """
        """
        detalles = etree.Element('detalles')
        for line in invoice.invoice_line:
            detalle = etree.Element('detalle')
            etree.SubElement(detalle, 'codigoInterno').text = line.product_id.default_code
            if line.product_id.manufacturer_pref:
                etree.SubElement(detalle, 'codigoAdicional').text = line.product_id.manufacturer_pref
            etree.SubElement(detalle, 'descripcion').text = line.product_id.name
            etree.SubElement(detalle, 'cantidad').text = '%.6f' % (line.quantity)
            etree.SubElement(detalle, 'precioUnitario').text = '%.6f' % (line.price_unit)
            etree.SubElement(detalle, 'descuento').text = '%.2f' % (line.discount_value)
            etree.SubElement(detalle, 'precioTotalSinImpuesto').text = '%.2f' % (line.price_subtotal)
            impuestos = etree.Element('impuestos')
            for tax_line in line.invoice_line_tax_id:
                if tax_line.tax_group in ['vat', 'vat0', 'ice', 'other']:
                    impuesto = etree.Element('impuesto')
                    etree.SubElement(impuesto, 'codigo').text = codigoImpuesto[tax_line.tax_group]
                    etree.SubElement(impuesto, 'codigoPorcentaje').text = tarifaImpuesto[tax_line.tax_group]
                    etree.SubElement(impuesto, 'tarifa').text = '%.2f' % (tax_line.amount * 100)
                    etree.SubElement(impuesto, 'baseImponible').text = '%.2f' % (line.price_subtotal)
                    etree.SubElement(impuesto, 'valor').text = '%.2f' % (line.amount_tax)
                    impuestos.append(impuesto)
            detalle.append(impuestos)
            detalles.append(detalle)
        return detalles

    def _generate_xml_invoice(self, invoice, access_key, emission_code):
        """
        """
        factura = etree.Element('factura')
        factura.set("id", "comprobante")
        factura.set("version", "1.1.0")
        
        # generar infoTributaria
        infoTributaria = self._get_tax_element(invoice, access_key, emission_code)
        factura.append(infoTributaria)
        
        # generar infoFactura
        infoFactura = self._get_invoice_element(invoice)
        factura.append(infoFactura)
        
        #generar detalles
        detalles = self._get_detail_element(invoice)
        
        factura.append(detalles)
        return factura

    def _generate_xml_refund(self, refund, invoice, access_key, emission_code):
        """
        """
        notaCredito = etree.Element('notaCredito')
        notaCredito.set("id", "comprobante")
        notaCredito.set("version", "1.1.0")
        
        # generar infoTributaria
        infoTributaria = self._get_tax_element(refund, access_key, emission_code)
        notaCredito.append(infoTributaria)
        
        
        # generar infoNotaCredito
        infoNotaCredito = self._get_refund_element(refund, invoice)
        notaCredito.append(infoNotaCredito)
        
        #generar detalles
        detalles = self._get_detail_element_refund(refund)
        notaCredito.append(detalles)
        
        return notaCredito
    
    def get_access_key(self, cr, uid, invoice):
        auth = invoice.journal_id.auth_id
        ld = invoice.date_invoice.split('-')
        ld.reverse()
        fecha = ''.join(ld)
        #
        tcomp = auth.type_id.code
        ruc = invoice.company_id.partner_id.ced_ruc
        serie = '{0}{1}'.format(auth.serie_entidad, auth.serie_emision)
        numero = invoice.supplier_invoice_number.replace('-','')[6:15] # FIX w/ number
        codigo_numero = self.get_code(cr, uid, invoice)
        tipo_emision = invoice.company_id.emission_code
        access_key = (
            [fecha, tcomp, ruc],
            [serie, numero, codigo_numero, tipo_emision]
            )
        return access_key
        
    def action_generate_einvoice(self, cr, uid, ids, context=None):
        """
        """
        for obj in self.browse(cr, uid, ids):
            # Codigo de acceso
            if obj.type in [ 'out_invoice', 'out_refund']:
                ak_temp = self.get_access_key(cr, uid, obj)
                access_key = SRIService.create_access_key(ak_temp)
                emission_code = obj.company_id.emission_code
                self.write(cr, uid, [obj.id], {'clave_acceso': access_key, 'emission_code': emission_code})
        
                if obj.type == 'out_invoice':
                    # XML del comprobante electrónico: factura
                    factura = self._generate_xml_invoice(obj, access_key, emission_code)
                else:
                    invoice_ids = self.pool.get('account.invoice').search(cr, uid, [('number','=',obj.name)])
                    factura_origen = self.browse(cr, uid, invoice_ids, context = context)
                    # XML del comprobante electrónico: factura
                    factura = self._generate_xml_refund(obj, factura_origen, access_key, emission_code)
            
                #validación del xml
                inv_xml = InvoiceXML(factura)
                if obj.type == 'out_invoice':
                    inv_xml.validate_invoice_xml()
                else:
                    inv_xml.validate_refund_xml()
                inv_xml.save(access_key)

                # firma de XML, now what ??
                # TODO: zip, checksum, save, send_mail
                xades = Xades()
                file_pk12 = obj.company_id.electronic_signature
                password = obj.company_id.password_electronic_signature
                xades.apply_digital_signature(access_key, file_pk12, password)
            
                # recepción del comprobante electrónico
                self.send_receipt(cr, uid, access_key)
            
                # solicitud de autorización del comprobante electrónico
                autorizacion = self.request_authorization(cr, uid, obj, access_key)

                if autorizacion:
                    if obj.type == 'out_invoice':
                        # envío del correo electrónico de factura al cliente
                        self.send_mail_invoice(cr, uid, obj, access_key, context)
                    else:
                        # envío del correo electrónico de nota de crédito al cliente
                        self.send_mail_refund(cr, uid, obj, access_key, context)
                else:
                    raise osv.except_osv('Error', 'No se puede enviar el correo electrónico la factura no se encuentra autorizada por el SRI') 

    def send_receipt(self, cr, uid, access_key):
        name = '%s%s.xml' %('/opt/facturas/', access_key)
        cadena = open(name, mode='rb').read()
        document = parseString(cadena.strip())
        xml = document.toxml('UTF-8').encode('base64')
    
        client = Client(SRIService.get_ws_test()[0])
        result =  client.service.validarComprobante(xml)
        self.__logger.info("RecepcionComprobantes: %s" % result)
        mensaje_error = ""
        if (result[0] == 'DEVUELTA'):
            comprobante = result[1].comprobante
            mensaje_error += 'Clave de Acceso: ' + comprobante[0].claveAcceso
            mensajes = comprobante[0].mensajes
            i = 0
            mensaje_error += "\nErrores:\n"
            while i < len(mensajes):
                mensaje = mensajes[i]
                mensaje_error += 'Identificador: ' + mensaje[i].identificador + '\nMensaje: ' + mensaje[i].mensaje + '\nInformacion Adicional: ' + mensaje[i].informacionAdicional + '\nTipo: ' + mensaje[i].tipo + "\n"
                i += 1
            raise osv.except_osv('Error SRI', mensaje_error)
        return True

    def request_authorization(self, cr, uid, obj, access_key):
        if not obj.numero_autorizacion:
            try:
                client_auto = Client(SRIService.get_ws_test()[1])
                result_auto =  client_auto.service.autorizacionComprobante(access_key)
                self.__logger.info("AutorizacionComprobantes: %s" % result_auto)
                if result_auto[2] == '':
                    raise osv.except_osv('Error SRI', 'No existe comprobante')
                else:
                    autorizaciones = result_auto[2].autorizacion
                    i = 0
                    autorizado = False
                    while i < len(autorizaciones):
                        autorizacion = autorizaciones[i]
                        estado = autorizacion.estado
                        fecha_autorizacion = autorizacion.fechaAutorizacion
                        mensaje_error = ''
                        if (estado == 'NO AUTORIZADO'):
                            #comprobante no autorizado
                            mensajes = autorizacion.mensajes
                            j = 0
                            mensaje_error += "\nErrores:\n"
                            while j < len(mensajes):
                                mensaje = mensajes[j]
                                mensaje_error += 'Identificador: ' + mensaje[j].identificador + '\nMensaje: ' + mensaje[j].mensaje + '\nTipo: ' + mensaje[j].tipo + '\n'
                                j += 1
                        else:
                            autorizado = True
                            numero_autorizacion = autorizacion.numeroAutorizacion
                        i += 1    
                    if autorizado == True:
                        self.write(cr, uid, obj.id, {'autorizado_sri': True, 'numero_autorizacion': numero_autorizacion, 'fecha_autorizacion': fecha_autorizacion})
                        autorizacion_xml = etree.Element('autorizacion')
                        etree.SubElement(autorizacion_xml, 'estado').text = estado
                        etree.SubElement(autorizacion_xml, 'numeroAutorizacion').text = numero_autorizacion
                        etree.SubElement(autorizacion_xml, 'fechaAutorizacion').text = str(fecha_autorizacion.strftime("%d/%m/%Y %H:%M:%S"))
                        etree.SubElement(autorizacion_xml, 'comprobante').text = etree.CDATA(autorizacion.comprobante)
                    
                        tree = etree.ElementTree(autorizacion_xml)
                        name = '%s%s.xml' %('/opt/facturas/', access_key)
                        fichero = tree.write(name,pretty_print=True,xml_declaration=True,encoding='utf-8',method="xml")
                    else:
                        raise osv.except_osv('Error SRI', mensaje_error)
            except TransportError as e:
                #raise osv.except_osv('Error', str(e))
                raise osv.except_osv(('Warning!'), (str(e)))
        else:
            raise osv.except_osv('Error', 'Factura Autorizada por el SRI')
        return numero_autorizacion
        
    def send_mail_invoice(self, cr, uid, obj, access_key, context=None):
        name = '%s%s.xml' %('/opt/facturas/', access_key)
        cadena = open(name, mode='rb').read()
        attachment_id = self.pool.get('ir.attachment').create(cr, uid, 
            {
                'name': '%s.xml' % (access_key),
                'datas': base64.b64encode(cadena),
                'datas_fname':  '%s.xml' % (access_key),
                'res_model': self._name,
                'res_id': obj.id,
                'type': 'binary'
            }, context=context)
                            
        email_template_obj = self.pool.get('email.template')
        template_id = self.pool.get('ir.model.data').get_object_reference(cr, uid, 'account', 'email_template_edi_invoice')[1]
        email_template_obj.write(cr, uid, template_id, {'attachment_ids': [(6, 0, [attachment_id])]})  
        email_template_obj.send_mail(cr, uid, template_id, obj.id, True)
        
        return True

    def send_mail_refund(self, cr, uid, obj, access_key, context=None):
        name = '%s%s.xml' %('/opt/facturas/', access_key)
        cadena = open(name, mode='rb').read()
        attachment_id = self.pool.get('ir.attachment').create(cr, uid,
            {
                'name': '%s.xml' % (access_key),
                'datas': base64.b64encode(cadena),
                'datas_fname':  '%s.xml' % (access_key),
                'res_model': self._name,
                'res_id': obj.id,
                'type': 'binary'
            }, context=context)

        email_template_obj = self.pool.get('email.template')
        template_id = self.pool.get('ir.model.data').get_object_reference(cr, uid, 'account', 'email_template_edi_refund')[1]
        email_template_obj.write(cr, uid, template_id, {'attachment_ids': [(6, 0, [attachment_id])]})
        email_template_obj.send_mail(cr, uid, template_id, obj.id, True)

        return True

sri.py

# -*- coding: utf-8 -*-
##############################################################################
#
#    XADES 
#    Copyright (C) 2014 Cristian Salamea All Rights Reserved
#    cristian.salamea@gmail.com
#    $Id$
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
##############################################################################

import logging
import os

from lxml import etree
from lxml.etree import DocumentInvalid

try:
    from suds.client import Client
    from suds.transport import TransportError
except ImportError:
    raise ImportError('Instalar Libreria suds')

from .xades import CheckDigit



class InvoiceXML(object):

    INVOICE_XSD_PATH = 'schemas/factura_v1.1.0.xsd'
    REFUND_XSD_PATH = 'schemas/notaCredito_v1.1.0.xsd'
    INVOICE_SCHEMA_INVALID = """El sistema generó el XML pero la factura no pasa la validación XSD del SRI.
            \nLos errores mas comunes son:\n* RUC,Cédula o Pasaporte contiene caracteres no válidos.\n* Números de documentos están duplicados.\n\nEl siguiente error contiene el identificador o número de documento en conflicto:\n\n %s"""

    @classmethod
    def __init__(self, element):
        self.invoice_element = element

    @classmethod
    def save(self, access_key):
        OPT_PATH = '/opt/facturas/'
        name = '%s%s.xml' % (OPT_PATH, access_key)
        tree = etree.ElementTree(self.invoice_element)
        tree.write(name, pretty_print=True, xml_declaration=True, encoding='utf-8', method="xml")
        
    @classmethod
    def validate_invoice_xml(self):
        """
        """
        file_path = os.path.join(os.path.dirname(__file__), self.INVOICE_XSD_PATH)
        schema_file = open(file_path)
        xmlschema_doc = etree.parse(schema_file)
        xmlschema = etree.XMLSchema(xmlschema_doc)
        try:
            xmlschema.assertValid(self.invoice_element)
        except DocumentInvalid as e:
            raise osv.except_osv('Error de Datos',  self.INVOICE_SCHEMA_INVALID % str(e))

    
    @classmethod
    def validate_refund_xml(self):
        """
        """
        file_path = os.path.join(os.path.dirname(__file__), self.REFUND_XSD_PATH)
        schema_file = open(file_path)
        xmlschema_doc = etree.parse(schema_file)
        xmlschema = etree.XMLSchema(xmlschema_doc)
        try:
            xmlschema.assertValid(self.invoice_element)
        except DocumentInvalid as e:
            raise osv.except_osv('Error de Datos',  self.INVOICE_SCHEMA_INVALID % str(e))

class Service(object):

    __AMBIENTE_PRUEBA = '1'
    __AMBIENTE_PROD = '2'
    __WS_TEST_RECEIV = 'https://celcer.sri.gob.ec/comprobantes-electronicos-ws/RecepcionComprobantes?wsdl'
    __WS_TEST_AUTH = 'https://celcer.sri.gob.ec/comprobantes-electronicos-ws/AutorizacionComprobantes?wsdl'
    __WS_RECEIV = 'https://cel.sri.gob.ec/comprobantes-electronicos-ws/RecepcionComprobantes?wsdl'
    __WS_AUTH = 'https://cel.sri.gob.ec/comprobantes-electronicos-ws/AutorizacionComprobantes?wsdl'

    @classmethod
    def get_env_test(self):
        return self.__AMBIENTE_PRUEBA

    @classmethod
    def get_env_prod(self):
        return self.__AMBIENTE_PROD

    @classmethod
    def get_ws_test(self):
        return self.__WS_TEST_RECEIV, self.__WS_TEST_AUTH

    @classmethod
    def get_ws_prod(self):
        return self.__WS_RECEIV, self.__WS_AUTH

    @classmethod
    def create_access_key(self, values):
        """
        values: tuple ([], [])
        """
        env = self.get_env_test()
        dato = ''.join(values[0] + [env] + values[1])
        modulo = CheckDigit.compute_mod11(dato)
        access_key = ''.join([dato, str(modulo)])
        return access_key

xades.py

# -*- coding: utf-8 -*-
##############################################################################
#
#    XADES 
#    Copyright (C) 2014 Cristian Salamea All Rights Reserved
#    cristian.salamea@gmail.com
#    $Id$
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
##############################################################################

import os
import base64
import StringIO
import hashlib
import datetime
import subprocess
try:
    from OpenSSL import crypto
except ImportError:
    raise ImportError('Instalar la libreria para soporte OpenSSL: pip install PyOpenSSL')

from pytz import timezone


class CheckDigit(object):

    # Definicion modulo 11
    _MODULO_11 = {
        'BASE': 11,
        'FACTOR': 2,
        'RETORNO11': 0,
        'RETORNO10': 1,
        'PESO': 2,
        'MAX_WEIGHT': 7
    }

    @classmethod
    def _eval_mod11(self, modulo):
        if modulo == self._MODULO_11['BASE']:
            return self._MODULO_11['RETORNO11']
        elif modulo == self._MODULO_11['BASE'] - 1:
            return self._MODULO_11['RETORNO10']
        else:
            return modulo

    @classmethod
    def compute_mod11(self, dato):
        """
        Calculo mod 11
        return int
        """
        total = 0
        weight = self._MODULO_11['PESO']
        
        for item in reversed(dato):
            total += int(item) * weight
            weight += 1
            if weight > self._MODULO_11['MAX_WEIGHT']:
                weight = self._MODULO_11['PESO']
        mod = 11 - total % self._MODULO_11['BASE']

        mod = self._eval_mod11(mod)
        return mod


class Xades(object):

    def apply_digital_signature(self, access_key, file_pk12, password):
        """
        Metodo que aplica la firma digital al XML
        """
        OPT_PATH = '/opt/facturas/'
        JAR_PATH = 'firma/prctXadesBes.jar'
        JAVA_CMD = 'java'
        ds_document = False
        name = '%s%s.xml' % (OPT_PATH, access_key)
        # firma electrónica del xml
        firma_path = os.path.join(os.path.dirname(__file__), JAR_PATH)
        # invocación del jar de la firma electrónica
        subprocess.call([JAVA_CMD, '-jar', firma_path, name, name, file_pk12, password])
        return ds_document