basic subscriptions system

1 files changed, 120 insertions, 0 deletions

diff --git a/python/defusedxml/common.py b/python/defusedxml/common.py
new file mode 100644
index 0000000..668b609
--- /dev/null
+++ b/python/defusedxml/common.py
@@ -0,0 +1,120 @@
+# defusedxml
+#
+# Copyright (c) 2013 by Christian Heimes <christian@python.org>
+# Licensed to PSF under a Contributor Agreement.
+# See http://www.python.org/psf/license for licensing details.
+"""Common constants, exceptions and helpe functions
+"""
+import sys
+
+PY3 = sys.version_info[0] == 3
+
+
+class DefusedXmlException(ValueError):
+    """Base exception
+    """
+
+    def __repr__(self):
+        return str(self)
+
+
+class DTDForbidden(DefusedXmlException):
+    """Document type definition is forbidden
+    """
+
+    def __init__(self, name, sysid, pubid):
+        super(DTDForbidden, self).__init__()
+        self.name = name
+        self.sysid = sysid
+        self.pubid = pubid
+
+    def __str__(self):
+        tpl = "DTDForbidden(name='{}', system_id={!r}, public_id={!r})"
+        return tpl.format(self.name, self.sysid, self.pubid)
+
+
+class EntitiesForbidden(DefusedXmlException):
+    """Entity definition is forbidden
+    """
+
+    def __init__(self, name, value, base, sysid, pubid, notation_name):
+        super(EntitiesForbidden, self).__init__()
+        self.name = name
+        self.value = value
+        self.base = base
+        self.sysid = sysid
+        self.pubid = pubid
+        self.notation_name = notation_name
+
+    def __str__(self):
+        tpl = "EntitiesForbidden(name='{}', system_id={!r}, public_id={!r})"
+        return tpl.format(self.name, self.sysid, self.pubid)
+
+
+class ExternalReferenceForbidden(DefusedXmlException):
+    """Resolving an external reference is forbidden
+    """
+
+    def __init__(self, context, base, sysid, pubid):
+        super(ExternalReferenceForbidden, self).__init__()
+        self.context = context
+        self.base = base
+        self.sysid = sysid
+        self.pubid = pubid
+
+    def __str__(self):
+        tpl = "ExternalReferenceForbidden(system_id='{}', public_id={})"
+        return tpl.format(self.sysid, self.pubid)
+
+
+class NotSupportedError(DefusedXmlException):
+    """The operation is not supported
+    """
+
+
+def _apply_defusing(defused_mod):
+    assert defused_mod is sys.modules[defused_mod.__name__]
+    stdlib_name = defused_mod.__origin__
+    __import__(stdlib_name, {}, {}, ["*"])
+    stdlib_mod = sys.modules[stdlib_name]
+    stdlib_names = set(dir(stdlib_mod))
+    for name, obj in vars(defused_mod).items():
+        if name.startswith("_") or name not in stdlib_names:
+            continue
+        setattr(stdlib_mod, name, obj)
+    return stdlib_mod
+
+
+def _generate_etree_functions(DefusedXMLParser, _TreeBuilder,
+                              _parse, _iterparse):
+    """Factory for functions needed by etree, dependent on whether
+    cElementTree or ElementTree is used."""
+
+    def parse(source, parser=None, forbid_dtd=False, forbid_entities=True,
+              forbid_external=True):
+        if parser is None:
+            parser = DefusedXMLParser(target=_TreeBuilder(),
+                                      forbid_dtd=forbid_dtd,
+                                      forbid_entities=forbid_entities,
+                                      forbid_external=forbid_external)
+        return _parse(source, parser)
+
+    def iterparse(source, events=None, parser=None, forbid_dtd=False,
+                  forbid_entities=True, forbid_external=True):
+        if parser is None:
+            parser = DefusedXMLParser(target=_TreeBuilder(),
+                                      forbid_dtd=forbid_dtd,
+                                      forbid_entities=forbid_entities,
+                                      forbid_external=forbid_external)
+        return _iterparse(source, events, parser)
+
+    def fromstring(text, forbid_dtd=False, forbid_entities=True,
+                   forbid_external=True):
+        parser = DefusedXMLParser(target=_TreeBuilder(),
+                                  forbid_dtd=forbid_dtd,
+                                  forbid_entities=forbid_entities,
+                                  forbid_external=forbid_external)
+        parser.feed(text)
+        return parser.close()
+
+    return parse, iterparse, fromstring