facho: clip.py se adiciona nuevo comando sign-verify-xml

FossilOrigin-Name: 66279b3511c7baabe491c86ecfce3b7680df8a8f049219baa4dcbdef42349f24

facho/fe/fe.py

@@ -18,7 +18,12 @@ SCHEME_AGENCY_ATTRS = {
     'schemeAgencyID': '195'
 }
 
-                      
+        
+# RESOLUCION 0001: pagina 516
+POLICY_ID = 'https://facturaelectronica.dian.gov.co/politicadefirma/v2/politicadefirmav2.pdf'
+POLICY_NAME = u'Política de firma para facturas electrónicas de la República de Colombia.'
+
+
 NAMESPACES = {
     'fe': 'http://www.dian.gov.co/contratos/facturaelectronica/v1',
     'cac': 'urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2',
@@ -36,6 +41,22 @@ NAMESPACES = {
     'sig': 'http://www.w3.org/2000/09/xmldsig#',
 }
 
+from contextlib import contextmanager
+@contextmanager
+def mock_xades_policy():
+    from mock import patch
+    import os.path
+    with patch('xades.policy.urllib.urlopen') as mock:
+        class UrllibPolicyMock:
+            def read(self):
+                cur_dir = os.path.dirname(os.path.abspath(__file__))
+                data_dir = os.path.join(cur_dir, 'data', 'dian')
+                policy_file = os.path.join(data_dir, 'politicadefirmav2.pdf')
+                with open(policy_file, 'rb') as f:
+                    return f.read()
+
+        mock.return_value = UrllibPolicyMock()
+        yield
 
 class FeXML(FachoXML):
 
@@ -177,10 +198,6 @@ class DianXMLExtensionSoftwareSecurityCode(FachoXMLExtension):
 
     
 class DianXMLExtensionSigner(FachoXMLExtension):
-    # RESOLUCION 0001: pagina 516
-    POLICY_ID = 'https://facturaelectronica.dian.gov.co/politicadefirma/v2/politicadefirmav2.pdf'
-    POLICY_NAME = u'Política de firma para facturas electrónicas de la República de Colombia.'
-    
     
     def __init__(self, pkcs12_path, passphrase=None, mockpolicy=False):
         self._pkcs12_path = pkcs12_path
@@ -243,26 +260,15 @@ class DianXMLExtensionSigner(FachoXMLExtension):
         xades.template.add_claimed_role(props, "supplier")
         
         policy = xades.policy.GenericPolicyId(
-            self.POLICY_ID,
-            self.POLICY_NAME,
+            POLICY_ID,
+            POLICY_NAME,
             xmlsig.constants.TransformSha256)
         ctx = xades.XAdESContext(policy)
         ctx.load_pkcs12(OpenSSL.crypto.load_pkcs12(open(self._pkcs12_path, 'rb').read(),
                                                    self._passphrase))
 
         if self._mockpolicy:
-            from mock import patch
-            import os.path
-            with patch('xades.policy.urllib.urlopen') as mock:
-                class UrllibPolicyMock:
-                    def read(self):
-                        cur_dir = os.path.dirname(os.path.abspath(__file__))
-                        data_dir = os.path.join(cur_dir, 'data', 'dian')
-                        policy_file = os.path.join(data_dir, 'politicadefirmav2.pdf')
-                        with open(policy_file, 'rb') as f:
-                            return f.read()
-
-                mock.return_value = UrllibPolicyMock()
+            with mock_xades_policy():
                 ctx.sign(signature)
                 ctx.verify(signature)
         else:
@@ -358,3 +364,38 @@ class DianZIP:
 
     def __exit__(self, type, value, traceback):
         return self.zipfile.close()
+
+
+class DianXMLExtensionSignerVerifier:
+    
+    def __init__(self, pkcs12_path, passphrase=None, mockpolicy=False):
+        self._pkcs12_path = pkcs12_path
+        self._passphrase = None
+        self._mockpolicy = mockpolicy
+        if passphrase:
+            self._passphrase = passphrase.encode('utf-8')
+
+    def verify_string(self, document):
+        xml = LXMLBuilder.from_string(document)
+        fachoxml = FachoXML(xml,nsmap=NAMESPACES)
+
+        signature = fachoxml.builder.xpath(fachoxml.root, '//ds:Signature')
+        assert signature is not None
+        
+        signature.getparent().remove(signature)
+        fachoxml.root.append(signature)
+
+        ctx = xades.XAdESContext()
+        ctx.load_pkcs12(OpenSSL.crypto.load_pkcs12(open(self._pkcs12_path, 'rb').read(),
+                                                   self._passphrase))
+
+        try:
+            if self._mockpolicy:
+                with mock_xades_policy():
+                    ctx.verify(signature)
+            else:
+                ctx.verify(signature)
+            return True
+        except:
+            return False
+