Switch to passlib for password hashing and verification

at some point now, can remove the 'salt' column too

rattail/db/auth.py

@@ -26,13 +26,15 @@ Authentication & Authorization
 
 from __future__ import unicode_literals, absolute_import
 
-import bcrypt
-import six
+from passlib.context import CryptContext
 from sqlalchemy.orm.exc import NoResultFound
 
 from rattail.db import model
 
 
+password_context = CryptContext(schemes=['bcrypt'])
+
+
 def authenticate_user(session, userobj, password):
     """
     Attempt to authenticate a user.
@@ -53,28 +55,15 @@ def authenticate_user(session, userobj, password):
         except NoResultFound:
             user = None
     if user and user.active and user.password is not None:
-        # apparently bcrypt's hashpw() doesn't like Unicode
-        if isinstance(password, six.text_type):
-            password = password.encode('utf_8')
-        salt = user.salt.encode('utf_8')
-        try:
-            authenticated = (bcrypt.hashpw(password, salt) == user.password)
-        except UnicodeEncodeError:
-            authenticated = False
-        if authenticated:
+        if password_context.verify(password, user.password):
             return user
-    return None
 
 
 def set_user_password(user, password):
     """
     Set a user's password.
     """
-    # apparently bcrypt's hashpw() doesn't like Unicode
-    if isinstance(password, six.text_type):
-        password = password.encode('utf_8')
-    user.salt = bcrypt.gensalt()
-    user.password = bcrypt.hashpw(password, user.salt)
+    user.password = password_context.hash(password)
 
 
 def special_role(session, uuid, name):

setup.py

@@ -162,7 +162,8 @@ else:
     extras['auth'] = [
         #
         # package                       # low                   high
-            
+
+        'passlib',                      # 1.7.1
         'py-bcrypt',                    # 0.2
         ]