Restructure Alliance Auth package (#867)

* Refactor allianceauth into its own package

* Add setup

* Add missing default_app_config declarations

* Fix timerboard namespacing

* Remove obsolete future imports

* Remove py2 mock support

* Remove six

* Add experimental 3.7 support and multiple Dj versions

* Remove python_2_unicode_compatible

* Add navhelper as local package

* Update requirements

allianceauth/authentication/tasks.py

@@ -0,0 +1,37 @@
+import logging
+
+from esi.errors import TokenExpiredError, TokenInvalidError
+from esi.models import Token
+
+from allianceauth.authentication.models import CharacterOwnership
+from allianceauth.celeryapp import app
+
+logger = logging.getLogger(__name__)
+
+
+@app.task
+def check_character_ownership(owner_hash):
+    tokens = Token.objects.filter(character_owner_hash=owner_hash)
+    if tokens:
+        for t in tokens:
+            old_hash = t.character_owner_hash
+            try:
+                t.update_token_data(commit=False)
+            except (TokenExpiredError, TokenInvalidError):
+                t.delete()
+                continue
+
+            if t.character_owner_hash == old_hash:
+                break
+            else:
+                logger.info('Character %s has changed ownership. Revoking %s tokens.' % (t.character_name, tokens.count()))
+                tokens.delete()
+    else:
+        logger.info('No tokens found with owner hash %s. Revoking ownership.' % owner_hash)
+        CharacterOwnership.objects.filter(owner_hash=owner_hash).delete()
+
+
+@app.task
+def check_all_character_ownership():
+    for c in CharacterOwnership.objects.all().only('owner_hash'):
+        check_character_ownership.delay(c.owner_hash)