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Added file accidentally ommitted from [11354].

git-svn-id: http://code.djangoproject.com/svn/django/branches/0.96-bugfixes@11430 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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commit 9cc89c97b9fd238254b11054583b5ec80f6a2fd9 1 parent 4059861
@freakboy3742 freakboy3742 authored
Showing with 28 additions and 0 deletions.
  1. +28 −0 django/utils/_os.py
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28 django/utils/_os.py
@@ -0,0 +1,28 @@
+"""
+A back-ported version of the same module from the 1.0.x branch, without the
+unicode support.
+"""
+
+from os.path import join, normcase, abspath, sep
+
+def safe_join(base, *paths):
+ """
+ Joins one or more path components to the base path component intelligently.
+ Returns a normalized, absolute version of the final path.
+
+ The final path must be located inside of the base path component (otherwise
+ a ValueError is raised).
+ """
+ # We need to use normcase to ensure we don't false-negative on case
+ # insensitive operating systems (like Windows).
+ final_path = normcase(abspath(join(base, *paths)))
+ base_path = normcase(abspath(base))
+ base_path_len = len(base_path)
+ # Ensure final_path starts with base_path and that the next character after
+ # the final path is os.sep (or nothing, in which case final_path must be
+ # equal to base_path).
+ if not final_path.startswith(base_path) \
+ or final_path[base_path_len:base_path_len+1] not in ('', sep):
+ raise ValueError('the joined path is located outside of the base path'
+ ' component')
+ return final_path
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