[feat] Migrate soledad documents by adding versioning field

- Resolves: #7713

3 files changed, 190 insertions, 5 deletions

diff --git a/src/leap/keymanager/keys.py b/src/leap/keymanager/keys.py
index 0de6a823..a60c19d3 100644
--- a/src/leap/keymanager/keys.py
+++ b/src/leap/keymanager/keys.py
@@ -45,6 +45,7 @@ logger = logging.getLogger(__name__)
 # Dictionary keys used for storing cryptographic keys.
 #
 
+KEY_VERSION_KEY = 'version'
 KEY_ADDRESS_KEY = 'address'
 KEY_TYPE_KEY = 'type'
 KEY_ID_KEY = 'key_id'
@@ -69,6 +70,10 @@ KEYMANAGER_KEY_TAG = 'keymanager-key'
 KEYMANAGER_ACTIVE_TAG = 'keymanager-active'
 KEYMANAGER_ACTIVE_TYPE = '-active'
 
+# Version of the Soledad Document schema,
+# it should be bumped each time the document format changes
+KEYMANAGER_DOC_VERSION = 1
+
 
 #
 # key indexing constants.
@@ -223,6 +228,7 @@ class EncryptionKey(object):
             KEY_LENGTH_KEY: self.length,
             KEY_EXPIRY_DATE_KEY: expiry_date,
             KEY_REFRESHED_AT_KEY: refreshed_at,
+            KEY_VERSION_KEY: KEYMANAGER_DOC_VERSION,
             KEY_TAGS_KEY: [KEYMANAGER_KEY_TAG],
         })
 
@@ -244,6 +250,7 @@ class EncryptionKey(object):
             KEY_LAST_AUDITED_AT_KEY: last_audited_at,
             KEY_ENCR_USED_KEY: self.encr_used,
             KEY_SIGN_USED_KEY: self.sign_used,
+            KEY_VERSION_KEY: KEYMANAGER_DOC_VERSION,
             KEY_TAGS_KEY: [KEYMANAGER_ACTIVE_TAG],
         })
 
@@ -281,7 +288,8 @@ class EncryptionScheme(object):
         :type soledad: leap.soledad.Soledad
         """
         self._soledad = soledad
-        self._init_indexes()
+        self.deferred_init = self._init_indexes()
+        self.deferred_init.addCallback(self._migrate_documents_schema)
 
     def _init_indexes(self):
         """
@@ -309,8 +317,14 @@ class EncryptionScheme(object):
                     deferreds.append(d)
             return defer.gatherResults(deferreds, consumeErrors=True)
 
-        self.deferred_indexes = self._soledad.list_indexes()
-        self.deferred_indexes.addCallback(init_idexes)
+        d = self._soledad.list_indexes()
+        d.addCallback(init_idexes)
+        return d
+
+    def _migrate_documents_schema(self, _):
+        from leap.keymanager.migrator import KeyDocumentsMigrator
+        migrator = KeyDocumentsMigrator(self._soledad)
+        return migrator.migrate()
 
     def _wait_indexes(self, *methods):
         """
@@ -343,7 +357,7 @@ class EncryptionScheme(object):
             self.stored[method] = getattr(self, method)
             setattr(self, method, makeWrapper(method))
 
-        self.deferred_indexes.addCallback(restore)
+        self.deferred_init.addCallback(restore)
 
     @abstractmethod
     def get_key(self, address, private=False):
diff --git a/src/leap/keymanager/migrator.py b/src/leap/keymanager/migrator.py
new file mode 100644
index 00000000..b59647a2
--- /dev/null
+++ b/src/leap/keymanager/migrator.py
@@ -0,0 +1,171 @@
+# -*- coding: utf-8 -*-
+# migrator.py
+# Copyright (C) 2015 LEAP
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+"""
+Document migrator
+"""
+# XXX: versioning has being added 12/2015 when keymanager was not
+#      much in use in the wild. We can probably drop support for
+#      keys without version at some point.
+
+
+from collections import namedtuple
+from twisted.internet.defer import gatherResults, succeed
+
+from leap.keymanager.keys import (
+    TAGS_PRIVATE_INDEX,
+    KEYMANAGER_KEY_TAG,
+    KEYMANAGER_ACTIVE_TAG,
+
+    KEYMANAGER_DOC_VERSION,
+    KEY_VERSION_KEY,
+    KEY_ID_KEY,
+    KEY_VALIDATION_KEY,
+    KEY_LAST_AUDITED_AT_KEY,
+    KEY_ENCR_USED_KEY,
+    KEY_SIGN_USED_KEY,
+)
+from leap.keymanager.validation import ValidationLevels
+
+
+KeyDocs = namedtuple("KeyDocs", ['key', 'active'])
+
+
+class KeyDocumentsMigrator(object):
+    """
+    Migrate old KeyManager Soledad Documents to the newest schema
+    """
+
+    def __init__(self, soledad):
+        self._soledad = soledad
+
+    def migrate(self):
+        deferred_public = self._get_docs(private=False)
+        deferred_public.addCallback(self._migrate_docs)
+
+        deferred_private = self._get_docs(private=True)
+        deferred_private.addCallback(self._migrate_docs)
+
+        return gatherResults([deferred_public, deferred_private])
+
+    def _get_docs(self, private=False):
+        private_value = '1' if private else '0'
+
+        deferred_keys = self._soledad.get_from_index(
+            TAGS_PRIVATE_INDEX,
+            KEYMANAGER_KEY_TAG,
+            private_value)
+        deferred_active = self._soledad.get_from_index(
+            TAGS_PRIVATE_INDEX,
+            KEYMANAGER_ACTIVE_TAG,
+            private_value)
+        return gatherResults([deferred_keys, deferred_active])
+
+    def _migrate_docs(self, (key_docs, active_docs)):
+        def update_keys(keys):
+            deferreds = []
+            for key_id in keys:
+                key = keys[key_id].key
+                actives = keys[key_id].active
+
+                d = self._migrate_actives(key, actives)
+                deferreds.append(d)
+
+                d = self._migrate_key(key)
+                deferreds.append(d)
+            return gatherResults(deferreds)
+
+        d = self._buildKeyDict(key_docs, active_docs)
+        d.addCallback(lambda keydict: self._filter_outdated(keydict))
+        d.addCallback(update_keys)
+
+    def _buildKeyDict(self, keys, actives):
+        keydict = {
+            fp2id(key.content[KEY_FINGERPRINT_KEY]): KeyDocs(key, [])
+            for key in keys}
+
+        deferreds = []
+        for active in actives:
+            if KEY_ID_KEY in active.content:
+                key_id = active.content[KEY_ID_KEY]
+                if key_id not in keydict:
+                    d = self._soledad.delete_doc(active)
+                    deferreds.append(d)
+                    continue
+                keydict[key_id].active.append(active)
+
+        d = gatherResults(deferreds)
+        d.addCallback(lambda _: keydict)
+        return d
+
+    def _filter_outdated(self, keydict):
+        outdated = {}
+        for key_id, docs in keydict.items():
+            if ((docs.key and KEY_VERSION_KEY not in docs.key.content) or
+                    docs.active):
+                outdated[key_id] = docs
+        return outdated
+
+    def _migrate_actives(self, key, actives):
+        if not key:
+            deferreds = []
+            for active in actives:
+                d = self._soledad.delete_doc(active)
+                deferreds.append(d)
+            return gatherResults(deferreds)
+
+        validation = str(ValidationLevels.Weak_Chain)
+        last_audited = 0
+        encr_used = False
+        sign_used = False
+        if len(actives) == 1 and KEY_VERSION_KEY not in key.content:
+            # we can preserve the validation of the key if there is only one
+            # active address for the key
+            validation = key.content[KEY_VALIDATION_KEY]
+            last_audited = key.content[KEY_LAST_AUDITED_AT_KEY]
+            encr_used = key.content[KEY_ENCR_USED_KEY]
+            sign_used = key.content[KEY_SIGN_USED_KEY]
+
+        deferreds = []
+        for active in actives:
+            if KEY_VERSION_KEY in active.content:
+                continue
+
+            active.content[KEY_VERSION_KEY] = KEYMANAGER_DOC_VERSION
+            active.content[KEY_VALIDATION_KEY] = validation
+            active.content[KEY_LAST_AUDITED_AT_KEY] = last_audited
+            active.content[KEY_ENCR_USED_KEY] = encr_used
+            active.content[KEY_SIGN_USED_KEY] = sign_used
+            d = self._soledad.put_doc(active)
+            deferreds.append(d)
+        return gatherResults(deferreds)
+
+    def _migrate_key(self, key):
+        if not key or KEY_VERSION_KEY in key.content:
+            return succeed(None)
+
+        key.content[KEY_VERSION_KEY] = KEYMANAGER_DOC_VERSION
+        del key.content[KEY_VALIDATION_KEY]
+        del key.content[KEY_LAST_AUDITED_AT_KEY]
+        del key.content[KEY_ENCR_USED_KEY]
+        del key.content[KEY_SIGN_USED_KEY]
+        return self._soledad.put_doc(key)
+
+
+def fp2id(fingerprint):
+    KEY_ID_LENGTH = 16
+    return fingerprint[-KEY_ID_LENGTH:]
diff --git a/src/leap/keymanager/tests/__init__.py b/src/leap/keymanager/tests/__init__.py
index cd612c43..d02f187f 100644
--- a/src/leap/keymanager/tests/__init__.py
+++ b/src/leap/keymanager/tests/__init__.py
@@ -76,7 +76,7 @@ class KeyManagerWithSoledadTestCase(unittest.TestCase, BaseLeapTest):
             return d
 
         # wait for the indexes to be ready for the tear down
-        d = km._wrapper_map[OpenPGPKey].deferred_indexes
+        d = km._wrapper_map[OpenPGPKey].deferred_init
         d.addCallback(get_and_delete_keys)
         d.addCallback(lambda _: self.tearDownEnv())
         d.addCallback(lambda _: self._soledad.close())