1 files changed, 81 insertions, 0 deletions
diff --git a/src/leap/bitmask/util/credentials.py b/src/leap/bitmask/util/credentials.py
new file mode 100644
index 00000000..07ded17b
--- /dev/null
+++ b/src/leap/bitmask/util/credentials.py
@@ -0,0 +1,81 @@
+# -*- coding: utf-8 -*-
+# credentials.py
+# Copyright (C) 2013 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/>.
+
+"""
+Credentials utilities
+"""
+from PySide import QtCore, QtGui
+
+WEAK_PASSWORDS = ("123456", "qweasd", "qwerty", "password")
+USERNAME_REGEX = r"^[A-Za-z][A-Za-z\d_\-\.]+[A-Za-z\d]$"
+
+USERNAME_VALIDATOR = QtGui.QRegExpValidator(QtCore.QRegExp(USERNAME_REGEX))
+
+
+def username_checks(username):
+    # translation helper
+    _tr = QtCore.QObject().tr
+
+    message = None
+
+    if message is None and len(username) < 2:
+        message = _tr("Username must have at least 2 characters")
+
+    valid = USERNAME_VALIDATOR.validate(username, 0)
+    valid_username = valid[0] == QtGui.QValidator.State.Acceptable
+    if message is None and not valid_username:
+        message = _tr("Invalid username")
+
+    return message is None, message
+
+
+def password_checks(username, password, password2):
+    """
+    Performs basic password checks to avoid really easy passwords.
+
+    :param username: username provided at the registrarion form
+    :type username: str
+    :param password: password from the registration form
+    :type password: str
+    :param password2: second password from the registration form
+    :type password: str
+
+    :returns: True and empty message if all the checks pass,
+              False and an error message otherwise
+    :rtype: tuple(bool, str)
+    """
+    # translation helper
+    _tr = QtCore.QObject().tr
+
+    message = None
+
+    if message is None and password != password2:
+        message = _tr("Passwords don't match")
+
+    if message is None and not password:
+        message = _tr("You can't use an empty password")
+
+    if message is None and len(password) < 6:
+        message = _tr("Password too short")
+
+    if message is None and password in WEAK_PASSWORDS:
+        message = _tr("Password too easy")
+
+    if message is None and username == password:
+        message = _tr("Password equal to username")
+
+    return message is None, message