Expose helper method.

The logic of assignments checking shall be easy to use by other plugins in
order to avoid code duplication and minimise risk of non fixed security issues.

product/ERP5Security/ERP5UserManager.py

@@ -91,6 +91,22 @@ def getUserByLogin(portal, login, exact_match=True):
   return [x.getObject() for x in result if not exact_match
                                            or x['reference'] in login]
 
+@transactional_cached(lambda portal, *args: args)
+def getValidAssignmentList(user):
+  """Returns list of valid assignments."""
+  assignment_list = [x for x in user.contentValues(portal_type="Assignment") if x.getValidationState() == "open"]
+  valid_assignment_list = []
+  # check dates if exist
+  login_date = DateTime()
+  for assignment in assignment_list:
+    if assignment.getStartDate() is not None and \
+           assignment.getStartDate() > login_date:
+      continue
+    if assignment.getStopDate() is not None and \
+           assignment.getStopDate() < login_date:
+      continue
+    valid_assignment_list.append(assignment)
+  return valid_assignment_list
 
 class ERP5UserManager(BasePlugin):
     """ PAS plugin for managing users in ERP5
@@ -141,22 +157,8 @@ class ERP5UserManager(BasePlugin):
             user = user_list[0]
 
             try:
-              # get assignment
-              assignment_list = [x for x in user.contentValues(portal_type="Assignment") if x.getValidationState() == "open"]
-              valid_assignment_list = []
-              # check dates if exist
-              login_date = DateTime()
-              for assignment in assignment_list:
-                if assignment.getStartDate() is not None and \
-                       assignment.getStartDate() > login_date:
-                  continue
-                if assignment.getStopDate() is not None and \
-                       assignment.getStopDate() < login_date:
-                  continue
-                valid_assignment_list.append(assignment)
-
               if (ignore_password or pw_validate(user.getPassword(), password)) and \
-                     len(valid_assignment_list) and user \
+                     len(getValidAssignmentList(user)) and user \
                      .getValidationState() != 'deleted': #user.getCareerRole() == 'internal':
                 return login, login # use same for user_id and login
             finally: