[bug] remove the dependency on enum34

* Resolves: #7188

7 files changed, 78 insertions, 52 deletions

diff --git a/keymanager/changes/bug-7188_rm_enum34 b/keymanager/changes/bug-7188_rm_enum34
new file mode 100644
index 00000000..4788df13
--- /dev/null
+++ b/keymanager/changes/bug-7188_rm_enum34
@@ -0,0 +1 @@
+- remove the dependency on enum34 (Closes: #7188)
diff --git a/keymanager/pkg/requirements.pip b/keymanager/pkg/requirements.pip
index c81c1a1c..1aef332e 100644
--- a/keymanager/pkg/requirements.pip
+++ b/keymanager/pkg/requirements.pip
@@ -4,4 +4,3 @@ requests
 # if we bump the gnupg version, bump also the sanity check
 # in keymanager.__init__
 gnupg>=1.4.0
-enum34
diff --git a/keymanager/src/leap/keymanager/__init__.py b/keymanager/src/leap/keymanager/__init__.py
index 47f479b3..c2d74096 100644
--- a/keymanager/src/leap/keymanager/__init__.py
+++ b/keymanager/src/leap/keymanager/__init__.py
@@ -57,7 +57,7 @@ from leap.keymanager.errors import (
     UnsupportedKeyTypeError,
     InvalidSignature
 )
-from leap.keymanager.validation import ValidationLevel, can_upgrade
+from leap.keymanager.validation import ValidationLevels, can_upgrade
 
 from leap.keymanager.keys import (
     build_key_from_dict,
@@ -224,10 +224,10 @@ class KeyManager(object):
             if self.OPENPGP_KEY in server_keys:
                 # nicknym server is authoritative for its own domain,
                 # for other domains the key might come from key servers.
-                validation_level = ValidationLevel.Weak_Chain
+                validation_level = ValidationLevels.Weak_Chain
                 _, domain = _split_email(address)
                 if (domain == _get_domain(self._nickserver_uri)):
-                    validation_level = ValidationLevel.Provider_Trust
+                    validation_level = ValidationLevels.Provider_Trust
 
                 d = self.put_raw_key(
                     server_keys['openpgp'],
@@ -712,7 +712,7 @@ class KeyManager(object):
         return d
 
     def put_raw_key(self, key, ktype, address,
-                    validation=ValidationLevel.Weak_Chain):
+                    validation=ValidationLevels.Weak_Chain):
         """
         Put raw key bound to address in local storage.
 
@@ -724,7 +724,7 @@ class KeyManager(object):
         :type address: str
         :param validation: validation level for this key
                            (default: 'Weak_Chain')
-        :type validation: ValidationLevel
+        :type validation: ValidationLevels
 
         :return: A Deferred which fires when the key is in the storage, or
                  which fails with KeyAddressMismatch if address doesn't match
@@ -744,7 +744,7 @@ class KeyManager(object):
         return d
 
     def fetch_key(self, address, uri, ktype,
-                  validation=ValidationLevel.Weak_Chain):
+                  validation=ValidationLevels.Weak_Chain):
         """
         Fetch a public key bound to address from the network and put it in
         local storage.
@@ -757,7 +757,7 @@ class KeyManager(object):
         :type ktype: subclass of EncryptionKey
         :param validation: validation level for this key
                            (default: 'Weak_Chain')
-        :type validation: ValidationLevel
+        :type validation: ValidationLevels
 
         :return: A Deferred which fires when the key is in the storage, or
                  which fails with KeyNotFound: if not valid key on uri or fails
diff --git a/keymanager/src/leap/keymanager/keys.py b/keymanager/src/leap/keymanager/keys.py
index 562c0a9b..91559c2f 100644
--- a/keymanager/src/leap/keymanager/keys.py
+++ b/keymanager/src/leap/keymanager/keys.py
@@ -35,7 +35,7 @@ from datetime import datetime
 from leap.common.check import leap_assert
 from twisted.internet import defer
 
-from leap.keymanager.validation import ValidationLevel, toValidationLevel
+from leap.keymanager.validation import ValidationLevels
 
 logger = logging.getLogger(__name__)
 
@@ -120,11 +120,11 @@ def build_key_from_dict(kClass, kdict):
     :rtype: C{kClass}
     """
     try:
-        validation = toValidationLevel(kdict[KEY_VALIDATION_KEY])
+        validation = ValidationLevels.get(kdict[KEY_VALIDATION_KEY])
     except ValueError:
         logger.error("Not valid validation level (%s) for key %s",
                      (kdict[KEY_VALIDATION_KEY], kdict[KEY_ID_KEY]))
-        validation = ValidationLevel.Weak_Chain
+        validation = ValidationLevels.Weak_Chain
 
     expiry_date = _to_datetime(kdict[KEY_EXPIRY_DATE_KEY])
     last_audited_at = _to_datetime(kdict[KEY_LAST_AUDITED_AT_KEY])
@@ -176,7 +176,7 @@ class EncryptionKey(object):
 
     def __init__(self, address, key_id="", fingerprint="",
                  key_data="", private=False, length=0, expiry_date=None,
-                 validation=ValidationLevel.Weak_Chain, last_audited_at=None,
+                 validation=ValidationLevels.Weak_Chain, last_audited_at=None,
                  refreshed_at=None, encr_used=False, sign_used=False):
         self.address = address
         self.key_id = key_id
@@ -213,7 +213,7 @@ class EncryptionKey(object):
             KEY_EXPIRY_DATE_KEY: expiry_date,
             KEY_LAST_AUDITED_AT_KEY: last_audited_at,
             KEY_REFRESHED_AT_KEY: refreshed_at,
-            KEY_VALIDATION_KEY: self.validation.name,
+            KEY_VALIDATION_KEY: str(self.validation),
             KEY_ENCR_USED_KEY: self.encr_used,
             KEY_SIGN_USED_KEY: self.sign_used,
             KEY_TAGS_KEY: [KEYMANAGER_KEY_TAG],
diff --git a/keymanager/src/leap/keymanager/tests/test_keymanager.py b/keymanager/src/leap/keymanager/tests/test_keymanager.py
index 55f892e9..08d37500 100644
--- a/keymanager/src/leap/keymanager/tests/test_keymanager.py
+++ b/keymanager/src/leap/keymanager/tests/test_keymanager.py
@@ -36,10 +36,7 @@ from leap.keymanager.keys import (
     is_address,
     build_key_from_dict,
 )
-from leap.keymanager.validation import (
-    ValidationLevel,
-    toValidationLevel
-)
+from leap.keymanager.validation import ValidationLevels
 from leap.keymanager.tests import (
     KeyManagerWithSoledadTestCase,
     ADDRESS,
@@ -82,7 +79,7 @@ class KeyManagerUtilTestCase(unittest.TestCase):
             'expiry_date': 0,
             'last_audited_at': 0,
             'refreshed_at': 1311239602,
-            'validation': ValidationLevel.Weak_Chain.name,
+            'validation': str(ValidationLevels.Weak_Chain),
             'encr_used': False,
             'sign_used': True,
         }
@@ -115,7 +112,7 @@ class KeyManagerUtilTestCase(unittest.TestCase):
             datetime.fromtimestamp(kdict['refreshed_at']), key.refreshed_at,
             'Wrong data in key.')
         self.assertEqual(
-            toValidationLevel(kdict['validation']), key.validation,
+            ValidationLevels.get(kdict['validation']), key.validation,
             'Wrong data in key.')
         self.assertEqual(
             kdict['encr_used'], key.encr_used,
@@ -227,7 +224,7 @@ class KeyManagerKeyManagementTestCase(KeyManagerWithSoledadTestCase):
         key = yield self._fetch_key(km, ADDRESS, PUBLIC_KEY)
         self.assertIsInstance(key, OpenPGPKey)
         self.assertTrue(ADDRESS in key.address)
-        self.assertEqual(key.validation, ValidationLevel.Provider_Trust)
+        self.assertEqual(key.validation, ValidationLevels.Provider_Trust)
 
     @inlineCallbacks
     def test_get_key_fetches_other_domain(self):
@@ -239,7 +236,7 @@ class KeyManagerKeyManagementTestCase(KeyManagerWithSoledadTestCase):
         key = yield self._fetch_key(km, ADDRESS_OTHER, PUBLIC_KEY_OTHER)
         self.assertIsInstance(key, OpenPGPKey)
         self.assertTrue(ADDRESS_OTHER in key.address)
-        self.assertEqual(key.validation, ValidationLevel.Weak_Chain)
+        self.assertEqual(key.validation, ValidationLevels.Weak_Chain)
 
     def _fetch_key(self, km, address, key):
         """
diff --git a/keymanager/src/leap/keymanager/tests/test_validation.py b/keymanager/src/leap/keymanager/tests/test_validation.py
index 15e7d27d..0c1d155f 100644
--- a/keymanager/src/leap/keymanager/tests/test_validation.py
+++ b/keymanager/src/leap/keymanager/tests/test_validation.py
@@ -31,10 +31,10 @@ from leap.keymanager.tests import (
     PUBLIC_KEY,
     KEY_FINGERPRINT
 )
-from leap.keymanager.validation import ValidationLevel
+from leap.keymanager.validation import ValidationLevels
 
 
-class ValidationLevelTestCase(KeyManagerWithSoledadTestCase):
+class ValidationLevelsTestCase(KeyManagerWithSoledadTestCase):
 
     @inlineCallbacks
     def test_none_old_key(self):
@@ -47,7 +47,7 @@ class ValidationLevelTestCase(KeyManagerWithSoledadTestCase):
     def test_cant_upgrade(self):
         km = self._key_manager()
         yield km.put_raw_key(PUBLIC_KEY, OpenPGPKey, ADDRESS,
-                             validation=ValidationLevel.Provider_Trust)
+                             validation=ValidationLevels.Provider_Trust)
         d = km.put_raw_key(UNRELATED_KEY, OpenPGPKey, ADDRESS)
         yield self.assertFailure(d, KeyNotValidUpgrade)
 
@@ -56,7 +56,7 @@ class ValidationLevelTestCase(KeyManagerWithSoledadTestCase):
         km = self._key_manager()
         yield km.put_raw_key(PUBLIC_KEY, OpenPGPKey, ADDRESS)
         yield km.put_raw_key(UNRELATED_KEY, OpenPGPKey, ADDRESS,
-                             validation=ValidationLevel.Fingerprint)
+                             validation=ValidationLevels.Fingerprint)
         key = yield km.get_key(ADDRESS, OpenPGPKey, fetch_remote=False)
         self.assertEqual(key.fingerprint, UNRELATED_FINGERPRINT)
 
@@ -73,12 +73,12 @@ class ValidationLevelTestCase(KeyManagerWithSoledadTestCase):
         km = self._key_manager()
         yield km.put_raw_key(
             EXPIRED_KEY, OpenPGPKey, ADDRESS,
-            validation=ValidationLevel.Third_Party_Endorsement)
+            validation=ValidationLevels.Third_Party_Endorsement)
         d = km.put_raw_key(
             UNRELATED_KEY,
             OpenPGPKey,
             ADDRESS,
-            validation=ValidationLevel.Provider_Trust)
+            validation=ValidationLevels.Provider_Trust)
         yield self.assertFailure(d, KeyNotValidUpgrade)
 
     @inlineCallbacks
@@ -93,9 +93,9 @@ class ValidationLevelTestCase(KeyManagerWithSoledadTestCase):
     def test_not_used(self):
         km = self._key_manager()
         yield km.put_raw_key(UNEXPIRED_KEY, OpenPGPKey, ADDRESS,
-                             validation=ValidationLevel.Provider_Trust)
+                             validation=ValidationLevels.Provider_Trust)
         yield km.put_raw_key(UNRELATED_KEY, OpenPGPKey, ADDRESS,
-                             validation=ValidationLevel.Provider_Endorsement)
+                             validation=ValidationLevels.Provider_Endorsement)
         key = yield km.get_key(ADDRESS, OpenPGPKey, fetch_remote=False)
         self.assertEqual(key.fingerprint, UNRELATED_FINGERPRINT)
 
@@ -114,7 +114,7 @@ class ValidationLevelTestCase(KeyManagerWithSoledadTestCase):
         yield km.verify(TEXT, ADDRESS, OpenPGPKey, detached_sig=signature)
         d = km.put_raw_key(
             UNRELATED_KEY, OpenPGPKey, ADDRESS,
-            validation=ValidationLevel.Provider_Endorsement)
+            validation=ValidationLevels.Provider_Endorsement)
         yield self.assertFailure(d, KeyNotValidUpgrade)
 
     @inlineCallbacks
diff --git a/keymanager/src/leap/keymanager/validation.py b/keymanager/src/leap/keymanager/validation.py
index dfe64329..3bb40325 100644
--- a/keymanager/src/leap/keymanager/validation.py
+++ b/keymanager/src/leap/keymanager/validation.py
@@ -24,34 +24,63 @@ See:
 
 
 from datetime import datetime
-from enum import IntEnum
 
 
-ValidationLevel = IntEnum("ValidationLevel",
-    "Weak_Chain "
-    "Provider_Trust "
-    "Provider_Endorsement "
-    "Third_Party_Endorsement "
-    "Third_Party_Consensus "
-    "Historically_Auditing "
-    "Known_Key "
-    "Fingerprint")
+class ValidationLevel(object):
+    """
+    A validation level
+
+    Meant to be used to compare levels or get it's string representation.
+    """
+    def __init__(self, name, value):
+        self.name = name
+        self.value = value
+
+    def __cmp__(self, other):
+        return cmp(self.value, other.value)
+
+    def __str__(self):
+        return self.name
+
+    def __repr__(self):
+        return "<ValidationLevel: %s (%d)>" % (self.name, self.value)
 
 
-def toValidationLevel(value):
+class _ValidationLevels(object):
     """
-    Convert a string representation of a validation level into
-    C{ValidationLevel}
+    Handler class to manage validation levels. It should have only one global
+    instance 'ValidationLevels'.
 
-    :param value: validation level
-    :type value: str
-    :rtype: ValidationLevel
-    :raises ValueError: if C{value} is not a validation level
+    The levels are attributes of the instance and can be used like:
+       ValidationLevels.Weak_Chain
+       ValidationLevels.get("Weak_Chain")
     """
-    for level in ValidationLevel:
-        if value == level.name:
-            return level
-    raise ValueError("Not valid validation level: %s" % (value,))
+    _level_names = ("Weak_Chain",
+                    "Provider_Trust",
+                    "Provider_Endorsement",
+                    "Third_Party_Endorsement",
+                    "Third_Party_Consensus",
+                    "Historically_Auditing",
+                    "Known_Key",
+                    "Fingerprint")
+
+    def __init__(self):
+        for name in self._level_names:
+            setattr(self, name,
+                    ValidationLevel(name, self._level_names.index(name)))
+
+    def get(self, name):
+        """
+        Get the ValidationLevel of a name
+
+        :param name: name of the level
+        :type name: str
+        :rtype: ValidationLevel
+        """
+        return getattr(self, name)
+
+
+ValidationLevels = _ValidationLevels()
 
 
 def can_upgrade(new_key, old_key):
@@ -69,7 +98,7 @@ def can_upgrade(new_key, old_key):
         return True
 
     # Manually verified fingerprint
-    if new_key.validation == ValidationLevel.Fingerprint:
+    if new_key.validation == ValidationLevels.Fingerprint:
         return True
 
     # Expired key and higher validation level