fixed #3, added secret key generator

CHANGELOG.md

@@ -2,9 +2,13 @@
 All enhancements and patches to cookiecutter-django will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## [2015-09-09]
+### Added
+- post_gen_hook to generate a secret key for use in locals.py. You should define your own for production (@pydanny)
+
 ## [2015-09-04]
 ### Added
-- Add easy deploy Heroku button and app.json file (@bogdal)
+- Easy deploy Heroku button and app.json file (@bogdal)
 
 ## [2015-09-03]
 ### Added

hooks/post_gen_project.py

@@ -0,0 +1,67 @@
+"""
+This code has been adopted from Django's standard crypto functions and
+utilities, specifically:
+    https://github.com/django/django/blob/master/django/utils/crypto.py
+"""
+import hashlib
+import os
+import random
+import shutil
+
+# Use the system PRNG if possible
+try:
+    random = random.SystemRandom()
+    using_sysrandom = True
+except NotImplementedError:
+    # import warnings
+    # warnings.warn('A secure pseudo-random number generator is not available '
+    #               'on your system. Falling back to Mersenne Twister.')
+    using_sysrandom = False
+
+def get_random_string(
+        length=50,
+        allowed_chars='abcdefghijklmnopqrstuvwxyz0123456789!@#$%^&*(-_=+)'):
+    """
+    Returns a securely generated random string.
+    The default length of 12 with the a-z, A-Z, 0-9 character set returns
+    a 71-bit value. log_2((26+26+10)^12) =~ 71 bits
+    """
+    if not using_sysrandom:
+        # This is ugly, and a hack, but it makes things better than
+        # the alternative of predictability. This re-seeds the PRNG
+        # using a value that is hard for an attacker to predict, every
+        # time a random string is required. This may change the
+        # properties of the chosen random sequence slightly, but this
+        # is better than absolute predictability.
+        random.seed(
+            hashlib.sha256(
+                ("%s%s%s" % (
+                    random.getstate(),
+                    time.time(),
+                    settings.SECRET_KEY)).encode('utf-8')
+            ).digest())
+    return ''.join(random.choice(allowed_chars) for i in range(length))
+
+# Get the root project directory
+project_directory = os.path.realpath(os.path.curdir)
+
+# Determine the local_setting_file_location
+local_setting_file_location = os.path.join(
+    project_directory,
+    'config/settings/local.py'
+)
+
+# Open locals.py
+with open(local_setting_file_location) as f:
+    local_py = f.read()
+
+# Generate a SECRET_KEY that matches the Django standard
+SECRET_KEY = get_random_string()
+SECRET_KEY = 'CHANGEME!!!' + SECRET_KEY
+
+# Replace "CHANGEME!!!" with SECRET_KEY
+local_py = local_py.replace('CHANGEME!!!', SECRET_KEY)
+
+# Write the results to the locals.py module
+with open(local_setting_file_location, 'w') as f:
+    f.write(local_py)