Switch unidecode over to the new anunidecode library and write some tests to validate results.

requirements-nover.txt

@@ -30,7 +30,7 @@ reportlab==2.7
 blinker
 raven
 python-ldap
-unidecode
 pycrypto
 logentries
 git+https://github.com/DevTable/aniso8601-fake.git
+git+https://github.com/DevTable/anunidecode.git

requirements.txt

@@ -13,10 +13,10 @@ PyGithub==1.25.0
 PyMySQL==0.6.2
 PyPDF2==1.22
 SQLAlchemy==0.9.7
-Unidecode==0.04.16
 Werkzeug==0.9.6
 alembic==0.6.5
 git+https://github.com/DevTable/aniso8601-fake.git
+git+https://github.com/DevTable/anunidecode.git
 argparse==1.2.1
 beautifulsoup4==4.3.2
 blinker==1.3

test/test_util.py

@@ -0,0 +1,50 @@
+import unittest
+
+from itertools import islice
+
+from util.validation import generate_valid_usernames
+
+class TestUsernameGenerator(unittest.TestCase):
+  def assert_generated_output(self, input_username, expected_output):
+    name_gen = generate_valid_usernames(input_username)
+    generated_output = list(islice(name_gen, 1))[0]
+    self.assertEquals(expected_output, generated_output)
+
+  def test_basic_ascii_names(self):
+    self.assert_generated_output('jake', 'jake')
+    self.assert_generated_output('frank', 'frank')
+
+  def test_names_with_caps(self):
+    self.assert_generated_output('Jake', 'jake')
+    self.assert_generated_output('FranK', 'frank')
+
+  def test_short_names(self):
+    self.assert_generated_output('a', 'a___')
+    self.assert_generated_output('ab', 'ab__')
+    self.assert_generated_output('abc', 'abc_')
+
+  def test_long_names(self):
+    self.assert_generated_output('abcdefghijklmnopqrstuvwxyz1234567890',
+                                 'abcdefghijklmnopqrstuvwxyz1234')
+
+  def test_unicode_transliteration(self):
+    self.assert_generated_output(u'\xc6neid', 'aeneid')
+    self.assert_generated_output(u'\xe9tude', 'etude')
+    self.assert_generated_output(u'\u5317\u4eb0', 'bei_jing')
+    self.assert_generated_output(u'\u1515\u14c7\u14c7', 'shanana')
+    self.assert_generated_output(u'\u13d4\u13b5\u13c6', 'taliqua')
+    self.assert_generated_output(u'\u0726\u071b\u073d\u0710\u073a', 'ptu_i')
+    self.assert_generated_output(u'\u0905\u092d\u093f\u091c\u0940\u0924', 'abhijiit')
+    self.assert_generated_output(u'\u0985\u09ad\u09bf\u099c\u09c0\u09a4', 'abhijiit')
+    self.assert_generated_output(u'\u0d05\u0d2d\u0d3f\u0d1c\u0d40\u0d24', 'abhijiit')
+    self.assert_generated_output(u'\u0d2e\u0d32\u0d2f\u0d3e\u0d32\u0d2e\u0d4d', 'mlyaalm')
+    self.assert_generated_output(u'\ue000', '____')
+    self.assert_generated_output(u'\u03ff', '____')
+
+  def test_multiple_suggestions(self):
+    name_gen = generate_valid_usernames('a')
+    generated_output = list(islice(name_gen, 4))
+    self.assertEquals('a___', generated_output[0])
+    self.assertEquals('a__0', generated_output[1])
+    self.assertEquals('a__1', generated_output[2])
+    self.assertEquals('a__2', generated_output[3])

util/validation.py

@@ -1,7 +1,6 @@
 import re
 import string
-
-from unidecode import unidecode
+import anunidecode
 
 
 INVALID_PASSWORD_MESSAGE = 'Invalid password, password must be at least ' + \
@@ -49,7 +48,7 @@ def _gen_filler_chars(num_filler_chars):
 
 
 def generate_valid_usernames(input_username):
-  normalized = unidecode(input_username).strip().lower()
+  normalized = input_username.encode('unidecode', 'ignore').strip().lower()
   prefix = re.sub(INVALID_USERNAME_CHARACTERS, '_', normalized)[:30]
 
   num_filler_chars = max(0, MIN_LENGTH - len(prefix))