DIAN 1.8.-2021: FAD03

FossilOrigin-Name: 0dd43cdbcd489f5433785b3b6281854e528719761b183d1eb498c43c8ae57924

README.rst

@@ -2,8 +2,6 @@
 facho
 =====
 
-!!INESTABLE NO RECOMENDAMOS USO PARA PRODUCION!!
-
 Libreria para facturacion electronica colombia.
 
 - facho/facho.py: abstracion para manipulacion del XML
@@ -24,7 +22,7 @@ usando pip::
 CLI
 ===
 
-tambien se provee linea de comandos **facho** para firmado y envio de documentos::
+tambien se provee linea de comandos **facho** para generacion, firmado y envio de documentos::
   facho --help
 
 CONTRIBUIR
@@ -32,17 +30,13 @@ CONTRIBUIR
 
 ver **CONTRIBUTING.rst**
 
+USO
+===
+
+ver **USAGE.rst**
+
+
 DIAN HABILITACION
 =================
 
 guia oficial actualizada al 2020-04-20: https://www.dian.gov.co/fizcalizacioncontrol/herramienconsulta/FacturaElectronica/Facturaci%C3%B3n_Gratuita_DIAN/Documents/Guia_usuario_08052019.pdf#search=numeracion
-
-
-ERROR X509SerialNumber
-======================
-
-
-lxml.etree.DocumentInvalid: Element '{http://www.w3.org/2000/09/xmldsig#}X509SerialNumber': '632837201711293159666920255411738137494572618415' is not a valid value of the atomic type 'xs:integer'
-
-Actualmente el xmlschema usado por xmlsig para el campo X509SerialNumber es tipo
-integer ahi que parchar manualmente a tipo string, en el archivo site-packages/xmlsig/data/xmldsig-core-schema.xsd.

USAGE.rst

@@ -0,0 +1,24 @@
+uso de la libreria
+==================
+
+**facho** es tanto una libreria para modelar y generar los documentos xml requeridos para la facturacion,
+asi como una herramienta de **consola** para facilitar algunas actividades como: generaciones de xml
+apartir de una especificacion en python, comprimir y enviar archivos según el SOAP vigente.
+
+**facho** es diseñado para ser usado en conjunto con el documento **docs/DIAN/Anexo_Tecnico_Factura_Electronica_Vr1_7_2020.pdf**, ya que en gran medida sigue la terminologia presente en este.
+
+
+Para ejemplos ver **examples/** .
+
+En terminos generales seria modelar la factura usando **facho/fe/form.py**, instanciar las extensiones requeridas ver **facho/fe/fe.py** y
+una vez generado el objeto invoice y las extensiones requeridas se procede a crear el XML, ejemplo:
+
+~~~python
+....
+xml = form_xml.DIANInvoiceXML(invoice)
+extensions = module.extensions(invoice)
+for extension in extensions:
+  xml.add_extension(extension)
+
+form_xml.DIANWriteSigned(xml, "factura.xml", "llave privada", "frase")
+~~~

examples/generate-invoice-from-cli.py

@@ -0,0 +1,117 @@
+# este archivo es un ejemplo para le generacion
+# una factura de venta nacional usando el comando **facho**.
+#
+# ejemplo: facho generate-invoice generate-invoice-from-cli.py
+#
+# importar libreria de modelos
+from facho.fe import form
+from facho.fe import form_xml
+
+# importar libreria extensiones xml para cumplir decreto
+from facho.fe import fe
+
+# importar otras necesarias
+from datetime import datetime, date
+
+# Datos del fomulario del SET de pruebas
+INVOICE_AUTHORIZATION = '181360000001' #Número suministrado por la Dian en el momento de la creación del SET de Pruebas  
+ID_SOFTWARE = '57bcb6d1-c591-5a90-b80a-cb030ec91440' #Id suministrado por la Dian en el momento de la creación del SET de Pruebas  
+PIN = '19642' #Número creado por la empresa para poder crear el SET de pruebas
+CLAVE_TECNICA = 'fc9eac422eba16e21ffd8c5f94b3f30a6e38162d' ##Id suministrado por la Dian en el momento de la creación del SET de Pruebas  
+
+
+# callback que retonar las extensiones XML necesarias
+# para que el documento final XML cumpla el decreto.
+#
+# muchos de los valores usados son obtenidos
+# del servicio web de la DIAN.
+def extensions(inv):
+    security_code = fe.DianXMLExtensionSoftwareSecurityCode(ID_SOFTWARE, PIN, inv.invoice_ident)
+    authorization_provider = fe.DianXMLExtensionAuthorizationProvider()
+    cufe = fe.DianXMLExtensionCUFE(inv, CLAVE_TECNICA, fe.AMBIENTE_PRUEBAS)
+    software_provider = fe.DianXMLExtensionSoftwareProvider('nit_empresa', 'dígito_verificación', ID_SOFTWARE)
+    inv_authorization = fe.DianXMLExtensionInvoiceAuthorization(INVOICE_AUTHORIZATION,
+                                                                datetime(2019, 1, 19),#Datos toamdos de 
+                                                                datetime(2030, 1, 19),#la configuración 
+                                                                'SETP', 990000000, 995000000)#del SET de pruebas
+    return [security_code, authorization_provider, cufe, software_provider, inv_authorization]
+
+def invoice():
+    # factura de venta nacional
+    inv = form.Invoice('01')
+    # asignar periodo de facturacion
+    inv.set_period(datetime.now(), datetime.now())
+    # asignar fecha de emision de la factura
+    inv.set_issue(datetime.now())
+    # asignar prefijo y numero del documento
+    inv.set_ident('SETP990000008')
+    # asignar tipo de operacion ver DIAN:6.1.5
+    inv.set_operation_type('10')
+    inv.set_supplier(form.Party(
+        legal_name = 'Nombre registrado de la empresa',
+        name = 'Nombre comercial o él mismo nombre registrado',
+        ident = form.PartyIdentification('nit_empresa', 'digito_verificación', '31'),
+        # obligaciones del contribuyente ver DIAN:FAK26
+        responsability_code = form.Responsability(['O-07', 'O-14', 'O-48']),
+        # ver DIAN:FAJ28
+        responsability_regime_code = '48',
+        # tipo de organizacion juridica ver DIAN:6.2.3
+        organization_code = '1',
+        email = "correoempresa@correoempresa.correo",
+        address = form.Address(
+            '', '', form.City('05001', 'Medellín'),
+            form.Country('CO', 'Colombia'),
+            form.CountrySubentity('05', 'Antioquia')),
+    ))
+    #Tercero a quien se le factura
+    inv.set_customer(form.Party(
+        legal_name = 'consumidor final',
+        name = 'consumidor final',
+        ident = form.PartyIdentification('222222222222', '', '13'),
+        responsability_code = form.Responsability(['R-99-PN']),
+        responsability_regime_code = '49',
+        organization_code = '2',
+        email = "consumidor_final0final.final",
+        address = form.Address(
+            '', '', form.City('05001', 'Medellín'),
+            form.Country('CO', 'Colombia'),
+            form.CountrySubentity('05', 'Antioquia')),
+		#tax_scheme = form.TaxScheme('01', 'IVA')
+    ))
+    # asignar metodo de pago    
+    inv.set_payment_mean(form.PaymentMean(
+        # metodo de pago ver DIAN:3.4.1
+        id = '1',
+        # codigo correspondiente al medio de pago ver DIAN:3.4.2
+        code = '20',
+        # fecha de vencimiento de la factura        
+        due_at = datetime.now(),
+        # identificador numerico
+        payment_id = '2'
+    ))
+    # adicionar una linea al documento
+    inv.add_invoice_line(form.InvoiceLine(
+        quantity = form.Quantity(int(20.5), '94'),
+        # item general de codigo 999
+        description = 'productO3',
+        item = form.StandardItem('test', 9999),
+        price = form.Price(
+            # precio base del item (sin iva)
+            amount = form.Amount(200.00),
+            # ver DIAN:6.3.5.1
+            type_code = '01',
+            type = 'x'
+        ),
+        tax = form.TaxTotal(
+            subtotals = [
+                form.TaxSubTotal(
+                    percent = 19.00,
+                    scheme=form.TaxScheme('01')
+                )
+            ]
+        )
+    ))
+    return inv
+
+def document_xml():
+    return form_xml.DIANInvoiceXML

examples/generate-invoice-invoice.py

@@ -1,74 +0,0 @@
-import facho.fe.form as form
-from facho.fe import fe
-from datetime import datetime
-
-def extensions(inv):
-    nit = form.PartyIdentification('nit', '5', '31')
-    security_code = fe.DianXMLExtensionSoftwareSecurityCode('id software', 'pin', inv.invoice_ident)
-    authorization_provider = fe.DianXMLExtensionAuthorizationProvider()
-    cufe = fe.DianXMLExtensionCUFE(inv, fe.DianXMLExtensionCUFE.AMBIENTE_PRUEBAS,
-                                   'clave tecnica')
-    software_provider = fe.DianXMLExtensionSoftwareProvider(nit, nit.dv, 'id software')
-    inv_authorization = fe.DianXMLExtensionInvoiceAuthorization('invoice autorization',
-                                                                datetime(2019, 1, 19),
-                                                                datetime(2030, 1, 19),
-                                                                'SETP', 990000001, 995000000)
-    return [security_code, authorization_provider, cufe, software_provider, inv_authorization]
-
-
-def invoice():
-    inv = form.Invoice()
-    inv.set_period(datetime.now(), datetime.now())
-    inv.set_issue(datetime.now())
-    inv.set_ident('SETP990003033')
-    inv.set_operation_type('10')
-    inv.set_supplier(form.Party(
-        legal_name = 'FACHO SOS',
-        name = 'FACHO SOS',
-        ident = form.PartyIdentification('900579212', '5', '31'),
-        responsability_code = form.Responsability(['O-07', 'O-09', 'O-14', 'O-48']),
-        responsability_regime_code = '48',
-        organization_code = '1',
-        email = "sdds@sd.com",
-        address = form.Address(
-            '', '', form.City('05001', 'Medellín'),
-            form.Country('CO', 'Colombia'),
-            form.CountrySubentity('05', 'Antioquia'))
-    ))
-    inv.set_customer(form.Party(
-        legal_name = 'facho-customer',
-        name = 'facho-customer',
-        ident = form.PartyIdentification('999999999', '', '13'),
-        responsability_code = form.Responsability(['R-99-PN']),
-        responsability_regime_code = '49',
-        organization_code = '2',
-        email = "sdds@sd.com",
-        address = form.Address(
-            '', '', form.City('05001', 'Medellín'),
-            form.Country('CO', 'Colombia'),
-            form.CountrySubentity('05', 'Antioquia'))
-    ))
-    inv.set_payment_mean(form.PaymentMean(
-        id = '1',
-        code = '10',
-        due_at = datetime.now(),
-        payment_id = '1'
-    ))
-    inv.add_invoice_line(form.InvoiceLine(
-        quantity = form.Quantity(1, '94'),
-        description = 'producto facho',
-        item = form.StandardItem('test', 9999),
-        price = form.Price(
-            amount = form.Amount(100.00),
-            type_code = '01',
-            type = 'x'
-        ),
-        tax = form.TaxTotal(
-            subtotals = [
-                form.TaxSubTotal(
-                    percent = 19.00,
-                )
-            ]
-        )
-    ))
-    return inv

examples/use-as-lib.py

@@ -0,0 +1,114 @@
+# importar libreria de modelos
+import facho.fe.form as form
+import facho.fe.form_xml
+
+PRIVATE_KEY_PATH='ruta a mi llave privada'
+PRIVATE_PASSPHRASE='clave de la llave privada'
+
+# consultar las extensiones necesarias
+def extensions(inv):
+    security_code = fe.DianXMLExtensionSoftwareSecurityCode('id software', 'pin', inv.invoice_ident)
+    authorization_provider = fe.DianXMLExtensionAuthorizationProvider()
+    cufe = fe.DianXMLExtensionCUFE(inv, fe.DianXMLExtensionCUFE.AMBIENTE_PRUEBAS,
+                                   'clave tecnica')
+    nit = form.PartyIdentification('nit', '5', '31')
+    software_provider = fe.DianXMLExtensionSoftwareProvider(nit, nit.dv, 'id software')
+    inv_authorization = fe.DianXMLExtensionInvoiceAuthorization('invoice autorization',
+                                                                datetime(2019, 1, 19),
+                                                                datetime(2030, 1, 19),
+                                                                'SETP', 990000001, 995000000)
+    return [security_code, authorization_provider, cufe, software_provider, inv_authorization]
+
+# generar documento desde modelo a ruta indicada
+def generate_document(invoice, filepath):
+    xml = form_xml.DIANInvoiceXML(invoice)
+    for extension in extensions(invoice):
+        xml.add_extension(extension)
+    form_xml.utils.DIANWriteSigned(xml, filepath, PRIVATE_KEY_PATH, PRIVATE_PASSPHRASE, True)
+
+# Modelars las facturas
+# ...
+
+# factura de venta nacional
+inv = form.NationalSalesInvoice()
+# asignar periodo de facturacion
+inv.set_period(datetime.now(), datetime.now())
+# asignar fecha de emision de la factura
+inv.set_issue(datetime.now())
+# asignar prefijo y numero del documento
+inv.set_ident('SETP990003033')
+# asignar tipo de operacion ver DIAN:6.1.5
+inv.set_operation_type('10')
+# asignar proveedor
+inv.set_supplier(form.Party(
+    legal_name = 'FACHO SOS',
+    name = 'FACHO SOS',
+    ident = form.PartyIdentification('900579212', '5', '31'),
+    # obligaciones del contribuyente ver DIAN:FAK26
+    responsability_code = form.Responsability(['O-07', 'O-09', 'O-14', 'O-48']),
+    # ver DIAN:FAJ28
+    responsability_regime_code = '48',
+    # tipo de organizacion juridica ver DIAN:6.2.3
+    organization_code = '1',
+    email = "sdds@sd.com",
+    address = form.Address(
+        name = '',
+        street = '',
+        city = form.City('05001', 'Medellín'),
+        country = form.Country('CO', 'Colombia'),
+        countrysubentity = form.CountrySubentity('05', 'Antioquia'))
+))
+inv.set_customer(form.Party(
+    legal_name = 'facho-customer',
+    name = 'facho-customer',
+    ident = form.PartyIdentification('999999999', '', '13'),
+    responsability_code = form.Responsability(['R-99-PN']),
+    responsability_regime_code = '49',
+    organization_code = '2',
+    email = "sdds@sd.com",
+    address = form.Address(
+        name = '',
+        street = '',
+        city = form.City('05001', 'Medellín'),
+        country = form.Country('CO', 'Colombia'),
+        countrysubentity = form.CountrySubentity('05', 'Antioquia'))
+))
+# asignar metodo de pago
+inv.set_payment_mean(form.PaymentMean(
+    # metodo de pago ver DIAN:3.4.1
+    id = '1',
+    # codigo correspondiente al medio de pago ver DIAN:3.4.2
+    code = '10',
+    # fecha de vencimiento de la factura
+    due_at = datetime.now(),
+    
+    # identificador numerico
+    payment_id = '1'
+))
+# adicionar una linea al documento
+inv.add_invoice_line(form.InvoiceLine(
+    quantity = form.Quantity(1, '94'),
+    description = 'producto facho',
+    # item general de codigo 999
+    item = form.StandardItem('test', 9999),
+    price = form.Price(
+        # precio base del tiem
+        amount = form.Amount(100.00),
+        # ver DIAN:6.3.5.1
+        type_code = '01',
+        type = 'x'
+    ),
+    tax = form.TaxTotal(
+        subtotals = [
+            form.TaxSubTotal(
+                percent = 19.00,
+            )
+        ]
+    )
+))
+
+# refrescar valores de la factura
+inv.calculate()
+
+# generar el documento xml en la ruta indicada
+generate_document(inv, 'ruta a donde guardar el .xml')

facho/facho.py

@@ -129,6 +129,11 @@ class FachoXML:
         self.xpath_for = {}
         self.extensions = []
 
+    @classmethod
+    def from_string(cls, document: str, namespaces: dict() = []) -> 'FachoXML':
+        xml = LXMLBuilder.from_string(document)
+        return FachoXML(xml, nsmap=namespaces)
+
     def append_element(self, elem, new_elem):
         #elem = self.find_or_create_element(xpath, append=append)
         #self.builder.append(elem, new_elem)

facho/fe/client/dian.py

@@ -138,10 +138,16 @@ class GetStatusResponse:
 
     @classmethod
     def fromdict(cls, data):
+        if data['ErrorMessage']:
+            error_message = data['ErrorMessage']['string']
+        else:
+            error_message = None
+            
         return cls(data['IsValid'],
                    data['StatusDescription'],
                    data['StatusCode'],
-                   data['ErrorMessage']['string'])
+                   error_message)
+                   
 
 @dataclass
 class GetStatus(SOAPService):

facho/fe/fe.py

@@ -14,6 +14,7 @@ from contextlib import contextmanager
 from .data.dian import codelist
 from . import form
 from collections import defaultdict
+from pathlib import Path
 
 AMBIENTE_PRUEBAS = codelist.TipoAmbiente.by_name('Pruebas')['code']
 AMBIENTE_PRODUCCION = codelist.TipoAmbiente.by_name('Producción')['code']
@@ -25,8 +26,9 @@ SCHEME_AGENCY_ATTRS = {
 }
 
 
+pwd = Path(__file__).parent
 # RESOLUCION 0001: pagina 516
-POLICY_ID = 'https://facturaelectronica.dian.gov.co/politicadefirma/v2/politicadefirmav2.pdf'
+POLICY_ID = 'file://'+str(pwd)+'/data/dian/politicadefirmav2.pdf'
 POLICY_NAME = u'Política de firma para facturas electrónicas de la República de Colombia.'
 
 
@@ -49,8 +51,7 @@ NAMESPACES = {
 }
 
 def fe_from_string(document: str) -> FachoXML:
-    xml = LXMLBuilder.from_string(document)
+    return FeXML.from_string(document)
-    return FachoXML(xml, nsmap=NAMESPACES)
 
 from contextlib import contextmanager
 @contextmanager
@@ -69,6 +70,7 @@ def mock_xades_policy():
         mock.return_value = UrllibPolicyMock()
         yield
 
+        
 class FeXML(FachoXML):
 
     def __init__(self, root, namespace):
@@ -79,6 +81,10 @@ class FeXML(FachoXML):
         self._cn = root.rstrip('/')
         #self.find_or_create_element(self._cn)
 
+    @classmethod
+    def from_string(cls, document: str) -> 'FeXML':
+        return super().from_string(document, namespaces=NAMESPACES)
+    
     def tostring(self, **kw):
         return super().tostring(**kw)\
             .replace("fe:", "")\
@@ -113,7 +119,8 @@ class DianXMLExtensionCUDFE(FachoXMLExtension):
         fachoxml.set_element('./cbc:UUID', cufe,
                              schemeID=self.tipo_ambiente,
                              schemeName=self.schemeName())
-        fachoxml.set_element('./cbc:ProfileID', 'DIAN 2.1')
+        #DIAN 1.8.-2021: FAD03
+        fachoxml.set_element('./cbc:ProfileID', 'DIAN 2.1: Factura Electrónica de Venta')
         fachoxml.set_element('./cbc:ProfileExecutionID', self._tipo_ambiente_int())
         #DIAN 1.7.-2020: FAB36
         fachoxml.set_element('./ext:UBLExtensions/ext:UBLExtension/ext:ExtensionContent/sts:DianExtensions/sts:QRCode',
@@ -185,14 +192,14 @@ class DianXMLExtensionCUFE(DianXMLExtensionCUDFE):
             '%s' % build_vars['NumFac'],
             '%s' % build_vars['FecFac'],
             '%s' % build_vars['HoraFac'],
-            form.Amount(build_vars['ValorBruto']).format('%.02f'),
+            form.Amount(build_vars['ValorBruto']).truncate_as_string(2),
             CodImpuesto1,
-            form.Amount(build_vars['ValorImpuestoPara'].get(CodImpuesto1, 0.0)).format('%.02f'),
+            build_vars['ValorImpuestoPara'].get(CodImpuesto1, form.Amount(0.0)).truncate_as_string(2),
             CodImpuesto2,
-            form.Amount(build_vars['ValorImpuestoPara'].get(CodImpuesto2, 0.0)).format('%.02f'),
+            build_vars['ValorImpuestoPara'].get(CodImpuesto2, form.Amount(0.0)).truncate_as_string(2),
             CodImpuesto3,
-            form.Amount(build_vars['ValorImpuestoPara'].get(CodImpuesto3, 0.0)).format('%.02f'),
+            build_vars['ValorImpuestoPara'].get(CodImpuesto3, form.Amount(0.0)).truncate_as_string(2),
-            form.Amount(build_vars['ValorTotalPagar']).format('%.02f'),
+            build_vars['ValorTotalPagar'].truncate_as_string(2),
             '%s' % build_vars['NitOFE'],
             '%s' % build_vars['NumAdq'],
             '%s' % build_vars['ClTec'],
@@ -222,14 +229,14 @@ class DianXMLExtensionCUDE(DianXMLExtensionCUDFE):
             '%s' % build_vars['NumFac'],
             '%s' % build_vars['FecFac'],
             '%s' % build_vars['HoraFac'],
-            form.Amount(build_vars['ValorBruto']).format('%.02f'),
+            form.Amount(build_vars['ValorBruto']).truncate_as_string(2),
             CodImpuesto1,
-            form.Amount(build_vars['ValorImpuestoPara'].get(CodImpuesto1, 0.0)).format('%.02f'),
+            form.Amount(build_vars['ValorImpuestoPara'].get(CodImpuesto1, 0.0)).truncate_as_string(2),
             CodImpuesto2,
-            form.Amount(build_vars['ValorImpuestoPara'].get(CodImpuesto2, 0.0)).format('%.02f'),
+            form.Amount(build_vars['ValorImpuestoPara'].get(CodImpuesto2, 0.0)).truncate_as_string(2),
             CodImpuesto3,
-            form.Amount(build_vars['ValorImpuestoPara'].get(CodImpuesto3, 0.0)).format('%.02f'),
+            form.Amount(build_vars['ValorImpuestoPara'].get(CodImpuesto3, 0.0)).truncate_as_string(2),
-            form.Amount(build_vars['ValorTotalPagar']).format('%.02f'),
+            form.Amount(build_vars['ValorTotalPagar']).truncate_as_string(2),
             '%s' % build_vars['NitOFE'],
             '%s' % build_vars['NumAdq'],
             '%s' % build_vars['Software-PIN'],
@@ -277,16 +284,24 @@ class DianXMLExtensionSoftwareSecurityCode(FachoXMLExtension):
 class DianXMLExtensionSigner:
 
     def __init__(self, pkcs12_path, passphrase=None, mockpolicy=False):
-        self._pkcs12_path = pkcs12_path
+        self._pkcs12_data = open(pkcs12_path, 'rb').read()
         self._passphrase = None
         self._mockpolicy = mockpolicy
         if passphrase:
             self._passphrase = passphrase.encode('utf-8')
 
     @classmethod
-    def from_pkcs12(self, filepath, password=None):
+    def from_bytes(cls, data, passphrase=None, mockpolicy=False):
-        p12 = OpenSSL.crypto.load_pkcs12(open(filepath, 'rb').read(), password)
+        self = cls.__new__(cls)
-
+        
+        self._pkcs12_data = data
+        self._passphrase = None
+        self._mockpolicy = mockpolicy
+        if passphrase:
+            self._passphrase = passphrase.encode('utf-8')
+            
+        return self
+    
     def sign_xml_string(self, document):
         xml = LXMLBuilder.from_string(document)
         signature = self.sign_xml_element(xml)
@@ -341,7 +356,7 @@ class DianXMLExtensionSigner:
             POLICY_NAME,
             xmlsig.constants.TransformSha256)
         ctx = xades.XAdESContext(policy)
-        ctx.load_pkcs12(OpenSSL.crypto.load_pkcs12(open(self._pkcs12_path, 'rb').read(),
+        ctx.load_pkcs12(OpenSSL.crypto.load_pkcs12(self._pkcs12_data,
                                                    self._passphrase))
 
         if self._mockpolicy:
@@ -360,6 +375,7 @@ class DianXMLExtensionSigner:
         extcontent = fachoxml.builder.xpath(fachoxml.root, './ext:UBLExtensions/ext:UBLExtension[2]/ext:ExtensionContent')
         fachoxml.append_element(extcontent, signature)
 
+        
 class DianXMLExtensionAuthorizationProvider(FachoXMLExtension):
     # RESOLUCION 0004: pagina 176
 
@@ -429,7 +445,7 @@ class DianZIP:
     MAX_FILES = 50
 
     def __init__(self, file_like):
-        self.zipfile = zipfile.ZipFile(file_like, mode='w')
+        self.zipfile = zipfile.ZipFile(file_like, mode='w', compression=zipfile.ZIP_DEFLATED)
         self.num_files = 0
 
     def add_invoice_xml(self, name, xml_data):
@@ -452,8 +468,8 @@ class DianZIP:
 
 class DianXMLExtensionSignerVerifier:
 
-    def __init__(self, pkcs12_path, passphrase=None, mockpolicy=False):
+    def __init__(self, pkcs12_path_or_bytes, passphrase=None, mockpolicy=False):
-        self._pkcs12_path = pkcs12_path
+        self._pkcs12_path_or_bytes = pkcs12_path_or_bytes
         self._passphrase = None
         self._mockpolicy = mockpolicy
         if passphrase:
@@ -470,7 +486,12 @@ class DianXMLExtensionSignerVerifier:
         fachoxml.root.append(signature)
 
         ctx = xades.XAdESContext()
-        ctx.load_pkcs12(OpenSSL.crypto.load_pkcs12(open(self._pkcs12_path, 'rb').read(),
+
+        pkcs12_data = self._pkcs12_path_or_bytes
+        if isinstance(self._pkcs12_path_or_bytes, str):
+            pkcs12_data = open(self._pkcs12_path_or_bytes, 'rb').read()
+
+        ctx.load_pkcs12(OpenSSL.crypto.load_pkcs12(pkcs12_data,
                                                    self._passphrase))
 
         try:

facho/fe/form/__init__.py

@@ -4,6 +4,7 @@
 import hashlib
 from functools import reduce
 import copy
+import dataclasses
 from dataclasses import dataclass
 from datetime import datetime, date
 from collections import defaultdict
@@ -53,7 +54,7 @@ class AmountCollection(Collection):
         return total
 
 class Amount:
-    def __init__(self, amount: int or float or Amount, currency: Currency = Currency('COP')):
+    def __init__(self, amount: int or float or str or Amount, currency: Currency = Currency('COP')):
 
         #DIAN 1.7.-2020: 1.2.3.1
         if isinstance(amount, Amount):
@@ -63,7 +64,7 @@ class Amount:
             self.amount = amount.amount
             self.currency = amount.currency
         else:
-            if amount < 0:
+            if float(amount) < 0:
                 raise ValueError('amount must be positive >= 0')
 
             self.amount = Decimal(amount, decimal.Context(prec=DECIMAL_PRECISION,
@@ -71,12 +72,17 @@ class Amount:
                                                           rounding=decimal.ROUND_HALF_EVEN ))
             self.currency = currency
 
+    def fromNumber(self, val):
+        return Amount(val, currency=self.currency)
+    
+    def round(self, prec):
+        return Amount(round(self.amount, prec), currency=self.currency)
 
     def __round__(self, prec):
         return round(self.amount, prec)
 
     def __str__(self):
-        return '%.06f' % self.amount
+        return str(self.float())
 
     def __lt__(self, other):
         if not self.is_same_currency(other):
@@ -88,17 +94,27 @@ class Amount:
             raise AmountCurrencyError()
         return round(self.amount, DECIMAL_PRECISION) == round(other.amount, DECIMAL_PRECISION)
 
-    def __add__(self, other):
+    def _cast(self, val):
+        if type(val) in [int, float]:
+            return self.fromNumber(val)
+        if isinstance(val, Amount):
+            return val
+        raise TypeError("cant cast to amount")
+    
+    def __add__(self, rother):
+        other = self._cast(rother)
         if not self.is_same_currency(other):
             raise AmountCurrencyError()
         return Amount(self.amount + other.amount, self.currency)
 
-    def __sub__(self, other):
+    def __sub__(self, rother):
+        other = self._cast(rother)
         if not self.is_same_currency(other):
             raise AmountCurrencyError()
         return Amount(self.amount - other.amount, self.currency)
 
-    def __mul__(self, other):
+    def __mul__(self, rother):
+        other = self._cast(rother)
         if not self.is_same_currency(other):
             raise AmountCurrencyError()
         return Amount(self.amount * other.amount, self.currency)
@@ -106,8 +122,9 @@ class Amount:
     def is_same_currency(self, other):
         return self.currency == other.currency
 
-    def format(self, formatter):
+    def truncate_as_string(self, prec):
-        return formatter % self.float()
+        parts = str(self.float()).split('.', 1)
+        return '%s.%s' % (parts[0], parts[1][0:prec].ljust(prec,'0'))
 
     def float(self):
         return float(round(self.amount, DECIMAL_PRECISION))
@@ -116,27 +133,25 @@ class Amount:
 class Quantity:
     
     def __init__(self, val, code):
-        if not isinstance(val, int):
+        if type(val) not in [float, int]:
-            raise ValueError('val expected int')
+            raise ValueError('val expected int or float')
         if code not in codelist.UnidadesMedida:
             raise ValueError("code [%s] not found" % (code))
 
-        self.value = val
+        self.value = Amount(val)
         self.code = code
 
     def __mul__(self, other):
-        if isinstance(other, Amount):
-            return Amount(self.value) * other
         return self.value * other
 
     def __lt__(self, other):
-        if isinstance(other, Amount):
-            return Amount(self.value) < other
         return self.value < other
 
     def __str__(self):
         return str(self.value)
 
+    def __repr__(self):
+        return str(self)
 
 @dataclass
 class Item:
@@ -323,11 +338,15 @@ class Price:
     amount: Amount
     type_code: str
     type: str
+    quantity: int = 1
 
     def __post_init__(self):
         if self.type_code not in codelist.CodigoPrecioReferencia:
             raise ValueError("type_code [%s] not found" % (self.type_code))
+        if not isinstance(self.quantity, int):
+            raise ValueError("quantity must be int")
 
+        self.amount *= self.quantity
 
 @dataclass
 class PaymentMean:
@@ -378,6 +397,52 @@ class InvoiceDocumentReference(BillingReference):
     date: fecha de emision de la nota credito relacionada
     """
 
+@dataclass
+class AllowanceChargeReason:
+    code: str
+    reason: str
+
+    def __post_init__(self):
+        if self.code not in codelist.CodigoDescuento:
+            raise ValueError("code [%s] not found" % (self.code))
+
+
+@dataclass
+class AllowanceCharge:
+    #DIAN 1.7.-2020: FAQ03
+    charge_indicator: bool = True
+    amount: Amount = Amount(0.0)
+    reason: AllowanceChargeReason = None
+
+    #Valor Base para calcular el descuento o el cargo
+    base_amount: typing.Optional[Amount] = Amount(0.0)
+    
+    # Porcentaje: Porcentaje que aplicar.
+    multiplier_factor_numeric: Amount = Amount(1.0)
+    
+    def isCharge(self):
+        return self.charge_indicator == True
+
+    def isDiscount(self):
+        return self.charge_indicator == False
+
+    def asCharge(self):
+        self.charge_indicator = True
+
+    def asDiscount(self):
+        self.charge_indicator = False
+
+    def hasReason(self):
+        return self.reason is not None
+
+    def set_base_amount(self, amount):
+        self.base_amount = amount
+
+class AllowanceChargeAsDiscount(AllowanceCharge):
+    def __init__(self, amount: Amount = Amount(0.0)):
+        self.charge_indicator = False
+        self.amount = amount
+
 @dataclass
 class InvoiceLine:
     # RESOLUCION 0004: pagina 155
@@ -391,9 +456,31 @@ class InvoiceLine:
     # de subtotal
     tax: typing.Optional[TaxTotal]
 
+    allowance_charge: typing.List[AllowanceCharge] = dataclasses.field(default_factory=list)
+
+    def add_allowance_charge(self, charge):
+        if not isinstance(charge, AllowanceCharge):
+            raise TypeError('charge invalid type expected AllowanceCharge')
+        charge.set_base_amount(self.total_amount_without_charge)
+        self.allowance_charge.add(charge)
+
+    @property
+    def total_amount_without_charge(self):
+        return (self.quantity * self.price.amount)
+    
     @property
     def total_amount(self):
-        return self.quantity * self.price.amount
+        charge = AmountCollection(self.allowance_charge)\
+            .filter(lambda charge: charge.isCharge())\
+            .map(lambda charge: charge.amount)\
+            .sum()
+
+        discount = AmountCollection(self.allowance_charge)\
+            .filter(lambda charge: charge.isDiscount())\
+            .map(lambda charge: charge.amount)\
+            .sum()
+
+        return self.total_amount_without_charge + charge - discount
 
     @property
     def total_tax_inclusive_amount(self):
@@ -441,37 +528,6 @@ class LegalMonetaryTotal:
             - self.prepaid_amount
 
 
-@dataclass
-class AllowanceChargeReason:
-    code: str
-    reason: str
-
-    def __post_init__(self):
-        if self.code not in codelist.CodigoDescuento:
-            raise ValueError("code [%s] not found" % (self.code))
-
-
-@dataclass
-class AllowanceCharge:
-    #DIAN 1.7.-2020: FAQ03
-    charge_indicator: bool = True
-    amount: Amount = Amount(0.0)
-    reason: AllowanceChargeReason = None
-
-    def isCharge(self):
-        return self.charge_indicator == True
-
-    def isDiscount(self):
-        return self.charge_indicator == False
-
-    def asCharge(self):
-        self.charge_indicator = True
-
-    def asDiscount(self):
-        self.charge_indicator = False
-
-    def hasReason(self):
-        return self.reason is not None
 
 class NationalSalesInvoiceDocumentType(str):
     def __str__(self):
@@ -570,7 +626,7 @@ class Invoice:
 
         self.invoice_operation_type = operation
 
-    def add_allownace_charge(self, charge: AllowanceCharge):
+    def add_allowance_charge(self, charge: AllowanceCharge):
         self.invoice_allowance_charge.append(charge)
 
     def add_invoice_line(self, line: InvoiceLine):
@@ -618,11 +674,22 @@ class Invoice:
         #DIAN 1.7.-2020: FAU14
         self.invoice_legal_monetary_total.calculate()
 
+    def _refresh_charges_base_amount(self):
+        if self.invoice_allowance_charge:
+            for invline in self.invoice_lines:
+                if invline.allowance_charge:
+                    # TODO actualmente solo uno de los cargos es permitido
+                    raise ValueError('allowance charge in invoice exclude invoice line')
+            
+        # cargos a nivel de factura
+        for charge in self.invoice_allowance_charge:
+            charge.set_base_amount(self.invoice_legal_monetary_total.line_extension_amount)
+        
     def calculate(self):
         for invline in self.invoice_lines:
             invline.calculate()
         self._calculate_legal_monetary_total()
-
+        self._refresh_charges_base_amount()
 
 class NationalSalesInvoice(Invoice):
     def __init__(self):

facho/fe/form_xml/invoice.py

@@ -540,10 +540,31 @@ class DIANInvoiceXML(fe.FeXML):
             line.set_element('./cac:Price/cbc:PriceAmount', invoice_line.price.amount, currencyID=invoice_line.price.amount.currency.code)
             #DIAN 1.7.-2020: FBB04
             line.set_element('./cac:Price/cbc:BaseQuantity',
-                             invoice_line.quantity,
+                             invoice_line.price.quantity,
                              unitCode=invoice_line.quantity.code)
 
+            for idx, charge in enumerate(invoice_line.allowance_charge):
+                next_append_charge = idx > 0
+                fexml.append_allowance_charge(line, index + 1, charge, append=next_append_charge)
+                
+    def set_allowance_charge(fexml, invoice):
+        for idx, charge in enumerate(invoice.invoice_allowance_charge):
+            next_append = idx > 0
+            fexml.append_allowance_charge(fexml, idx + 1, charge, append=next_append)
 
+    def append_allowance_charge(fexml, parent, idx, charge, append=False):
+            line = parent.fragment('./cac:AllowanceCharge', append=append)
+            #DIAN 1.7.-2020: FAQ02
+            line.set_element('./cbc:ID', idx)
+            #DIAN 1.7.-2020: FAQ03
+            line.set_element('./cbc:ChargeIndicator', str(charge.charge_indicator).lower())
+            if charge.reason:
+                line.set_element('./cbc:AllowanceChargeReasonCode', charge.reason.code)
+                line.set_element('./cbc:allowanceChargeReason', charge.reason.reason)
+            line.set_element('./cbc:MultiplierFactorNumeric', str(round(charge.multiplier_factor_numeric, 2)))
+            fexml.set_element_amount_for(line, './cbc:Amount', charge.amount)
+            fexml.set_element_amount_for(line, './cbc:BaseAmount', charge.base_amount)
+            
     def attach_invoice(fexml, invoice):
         """adiciona etiquetas a FEXML y retorna FEXML
         en caso de fallar validacion retorna None"""
@@ -579,6 +600,7 @@ class DIANInvoiceXML(fe.FeXML):
         fexml.set_invoice_totals(invoice)
         fexml.set_invoice_lines(invoice)
         fexml.set_payment_mean(invoice)
+        fexml.set_allowance_charge(invoice)
         fexml.set_billing_reference(invoice)
 
         return fexml

tests/test_amount.py

@@ -20,3 +20,34 @@ def test_amount_equals():
     assert price1 == price2
     assert price1 == form.Amount(100) + form.Amount(10)
     assert price1 == form.Amount(10) * form.Amount(10) + form.Amount(10)
+    assert form.Amount(110) == (form.Amount(1.10) * form.Amount(100))
+
+def test_round_half_even():
+    # https://www.w3.org/TR/xpath-functions-31/#func-round-half-to-even
+    assert form.Amount(0.5).round(0).float() == 0.0
+    assert form.Amount(1.5).round(0).float() == 2.0
+    assert form.Amount(2.5).round(0).float() == 2.0
+    assert form.Amount(3.567812e+3).round(2).float() == 3567.81e0
+    assert form.Amount(4.7564e-3).round(2).float() == 0.0e0
+
+def test_round():
+    # Entre 0 y 5 Mantener el dígito menos significativo
+    assert form.Amount(1.133).round(2) == form.Amount(1.13)
+    # Entre 6 y 9 Incrementar el dígito menos significativo
+    assert form.Amount(1.166).round(2) == form.Amount(1.17)
+    # 5, y el segundo dígito siguiente al dígito menos significativo es cero o par Mantener el dígito menos significativo
+    assert str(form.Amount(1.1542).round(2)) == str(form.Amount(1.15))
+    # 5, y el segundo dígito siguiente al dígito menos significativo es impar Incrementar el dígito menos significativo
+    assert str(form.Amount(1.1563).round(2)) == str(form.Amount(1.16))
+
+def test_amount_truncate():
+    assert form.Amount(1.1569).truncate_as_string(2) == '1.15'
+    assert form.Amount(587.0700).truncate_as_string(2) == '587.07'
+    assert form.Amount(14705.8800).truncate_as_string(2) == '14705.88'
+    assert form.Amount(9423.7000).truncate_as_string(2) == '9423.70'
+    assert form.Amount(10084.03).truncate_as_string(2) == '10084.03'
+    assert form.Amount(10000.02245).truncate_as_string(2) == '10000.02'
+    assert form.Amount(10000.02357).truncate_as_string(2) == '10000.02'
+
+def test_amount_format():
+    assert str(round(form.Amount(1.1569),2)) == '1.16'

tests/test_fe.py

@@ -110,3 +110,19 @@ def test_xml_sign_dian(monkeypatch):
         helpers.mock_urlopen(m)
         xmlsigned = signer.sign_xml_string(xmlstring)
     assert "Signature" in xmlsigned
+
+def test_xml_sign_dian_using_bytes(monkeypatch):
+    xml = fe.FeXML('Invoice',
+                'http://www.dian.gov.co/contratos/facturaelectronica/v1')
+    xml.find_or_create_element('/fe:Invoice/ext:UBLExtensions/ext:UBLExtension/ext:ExtensionContent')
+    ublextension = xml.fragment('/fe:Invoice/ext:UBLExtensions/ext:UBLExtension', append=True)
+    extcontent = ublextension.find_or_create_element('/ext:UBLExtension/ext:ExtensionContent')
+
+    xmlstring = xml.tostring()
+    p12_data = open('./tests/example.p12', 'rb').read()
+    signer = fe.DianXMLExtensionSigner.from_bytes(p12_data)
+
+    with monkeypatch.context() as m:
+        helpers.mock_urlopen(m)
+        xmlsigned = signer.sign_xml_string(xmlstring)
+    assert "Signature" in xmlsigned

tests/test_fe_form.py

@@ -55,6 +55,13 @@ def test_invoicesimple_zip(simple_invoice):
     with fe.DianZIP(zipdata) as dianzip:
         name_invoice = dianzip.add_invoice_xml(simple_invoice.invoice_ident, str(xml_invoice))
 
+    # el zip ademas de archivar debe comprimir los archivos
+    # de lo contrario la DIAN lo rechaza
+    with zipfile.ZipFile(zipdata) as dianzip:
+        dianzip.testzip()
+        for zipinfo in dianzip.infolist():
+            assert zipinfo.compress_type == zipfile.ZIP_DEFLATED, "se espera el zip comprimido"
+
     with zipfile.ZipFile(zipdata) as dianzip:
         xml_data = dianzip.open(name_invoice).read().decode('utf-8')
         assert xml_data == str(xml_invoice)
@@ -112,7 +119,7 @@ def test_invoice_cufe(simple_invoice_without_lines):
     simple_invoice.invoice_supplier.ident = form.PartyIdentification('700085371', '5', '31')
     simple_invoice.invoice_customer.ident = form.PartyIdentification('800199436', '5', '31')
     simple_invoice.add_invoice_line(form.InvoiceLine(
-        quantity = form.Quantity(1, '94'),
+        quantity = form.Quantity(1.00, '94'),
         description = 'producto',
         item = form.StandardItem(111),
         price = form.Price(form.Amount(1_500_000), '01', ''),
@@ -170,6 +177,7 @@ def test_invoice_cufe(simple_invoice_without_lines):
     assert cufe == '8bb918b19ba22a694f1da11c643b5e9de39adf60311cf179179e9b33381030bcd4c3c3f156c506ed5908f9276f5bd9b4'
 
 
+
 def test_credit_note_cude(simple_credit_note_without_lines):
     simple_invoice = simple_credit_note_without_lines
     simple_invoice.invoice_ident = '8110007871'

tests/test_form.py

@@ -38,7 +38,10 @@ def test_invoice_legalmonetary():
     assert inv.invoice_legal_monetary_total.tax_inclusive_amount == form.Amount(119.0)
     assert inv.invoice_legal_monetary_total.charge_total_amount == form.Amount(0.0)
 
-
+def test_allowancecharge_as_discount():
+    discount = form.AllowanceChargeAsDiscount(amount=form.Amount(1000.0))
+    assert discount.isDiscount() == True
+    
 def test_FAU10():
     inv = form.NationalSalesInvoice()
     inv.add_invoice_line(form.InvoiceLine(
@@ -58,7 +61,7 @@ def test_FAU10():
             ]
         )
     ))
-    inv.add_allownace_charge(form.AllowanceCharge(amount=form.Amount(19.0)))
+    inv.add_allowance_charge(form.AllowanceCharge(amount=form.Amount(19.0)))
 
     inv.calculate()
     assert inv.invoice_legal_monetary_total.line_extension_amount == form.Amount(100.0)
@@ -86,7 +89,7 @@ def test_FAU14():
             ]
         )
     ))
-    inv.add_allownace_charge(form.AllowanceCharge(amount=form.Amount(19.0)))
+    inv.add_allowance_charge(form.AllowanceCharge(amount=form.Amount(19.0)))
     inv.add_prepaid_payment(form.PrePaidPayment(paid_amount = form.Amount(50.0)))
     inv.calculate()
 

tests/test_form_xml.py

@@ -6,9 +6,14 @@
 """Tests for `facho` package."""
 
 import pytest
+from datetime import datetime
+import copy
 
+from facho.fe import form
 from facho.fe import form_xml
 
+from fixtures import *
+
 def test_import_DIANInvoiceXML():
     try:
         form_xml.DIANInvoiceXML
@@ -27,3 +32,65 @@ def test_import_DIANCreditNoteXML():
         form_xml.DIANCreditNoteXML
     except AttributeError:
         pytest.fail("unexpected not found")
+
+def test_allowance_charge_in_invoice(simple_invoice_without_lines):
+    inv = copy.copy(simple_invoice_without_lines)
+    inv.add_invoice_line(form.InvoiceLine(
+        quantity = form.Quantity(1, '94'),
+        description = 'producto facho',
+        item = form.StandardItem(9999),
+        price = form.Price(
+            amount = form.Amount(100.0),
+            type_code = '01',
+            type = 'x'
+        ),
+        tax = form.TaxTotal(
+            subtotals = [
+                form.TaxSubTotal(
+                    percent = 19.0,
+                )
+            ]
+        )
+    ))
+    inv.add_allowance_charge(form.AllowanceCharge(amount=form.Amount(19.0)))
+    inv.calculate()
+    
+    xml = form_xml.DIANInvoiceXML(inv)
+    assert xml.get_element_text('./cac:AllowanceCharge/cbc:ID') == '1'
+    assert xml.get_element_text('./cac:AllowanceCharge/cbc:ChargeIndicator') == 'true'
+    assert xml.get_element_text('./cac:AllowanceCharge/cbc:Amount') == '19.0'
+    assert xml.get_element_text('./cac:AllowanceCharge/cbc:BaseAmount') == '100.0'
+
+def test_allowance_charge_in_invoice_line(simple_invoice_without_lines):
+    inv = copy.copy(simple_invoice_without_lines)
+    inv.add_invoice_line(form.InvoiceLine(
+        quantity = form.Quantity(1, '94'),
+        description = 'producto facho',
+        item = form.StandardItem(9999),
+        price = form.Price(
+            amount = form.Amount(100.0),
+            type_code = '01',
+            type = 'x'
+        ),
+        tax = form.TaxTotal(
+            subtotals = [
+                form.TaxSubTotal(
+                    percent = 19.0,
+                )
+            ]
+        ),
+        allowance_charge = [
+            form.AllowanceChargeAsDiscount(amount=form.Amount(10.0))
+        ]
+    ))
+    inv.calculate()
+
+    # se aplico descuento
+    assert inv.invoice_legal_monetary_total.line_extension_amount == form.Amount(90.0)
+    
+    xml = form_xml.DIANInvoiceXML(inv)
+
+    with pytest.raises(AttributeError):
+        assert xml.get_element_text('/fe:Invoice/cac:AllowanceCharge/cbc:ID') == '1'
+    xml.get_element_text('/fe:Invoice/cac:InvoiceLine/cac:AllowanceCharge/cbc:ID') == '1'
+    xml.get_element_text('/fe:Invoice/cac:InvoiceLine/cac:AllowanceCharge/cbc:BaseAmount') == '100.0'