from __future__ import with_statement
+import binascii as _B
import errno as _E
import os as _OS
-from cStringIO import StringIO as _StringIO
+import sys as _SYS
+
+if _SYS.version_info >= (3,): from io import StringIO as _StringIO
+else: from cStringIO import StringIO as _StringIO
import catacomb as _C
###--------------------------------------------------------------------------
### Python version portability.
-def _iterkeys(dict): return dict.iterkeys()
-def _itervalues(dict): return dict.itervalues()
-def _iteritems(dict): return dict.iteritems()
-
-def _bin(text): return text
-def _text(bin): return bin
+if _SYS.version_info >= (3,):
+ def _iterkeys(dict): return dict.keys()
+ def _itervalues(dict): return dict.values()
+ def _iteritems(dict): return dict.items()
+ def _bin(text): return text.encode(errors = "surrogateescape")
+ def _text(bin): return bin.decode(errors = "surrogateescape")
+else:
+ def _iterkeys(dict): return dict.iterkeys()
+ def _itervalues(dict): return dict.itervalues()
+ def _iteritems(dict): return dict.iteritems()
+ def _bin(text): return text
+ def _text(bin): return bin
_NUL = _bin('\0')
_CIPHER = _bin('cipher:')
_MAC = _bin('mac:')
+def _with_metaclass(meta, *supers):
+ return meta("#<anonymous base %s>" % meta.__name__,
+ supers or (object,), dict())
+
def _excval(): return _SYS.exc_info()[1]
_M600 = int("600", 8)
def _b64(s):
"""Encode S as base64, without newlines, and trimming `=' padding."""
- return s.encode('base64').replace('\n', '').rstrip('=')
+ return _text(_B.b2a_base64(s)).replace('\n', '').rstrip('=')
def _unb64(s):
"""Decode S as base64 with trimmed `=' padding."""
- return (s + '='*((4 - len(s))%4)).decode('base64')
+ return _B.a2b_base64(s + '='*((4 - len(s))%4))
def _enc_metaval(val):
"""Encode VAL as a metadata item value, returning the result."""
Register a new concrete StorageBackend subclass.
"""
super(StorageBackendClass, me).__init__(name, supers, dict)
- if me.NAME is not None: StorageBackend.register_concrete_subclass(me)
+ try: name = me.NAME
+ except AttributeError: pass
+ else: StorageBackend.register_concrete_subclass(me)
-class StorageBackend (object):
+class StorageBackend (_with_metaclass(StorageBackendClass)):
"""
I provide basic protocol for password storage backends.
priority order when opening an existing database.
"""
- __metaclass__ = StorageBackendClass
- NAME = None
PRIO = 10
## The registry of subclasses.