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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
Russell Keith-Magee authored August 11, 2009

Showing 1 changed file with 28 additions and 0 deletions. Show diff stats Hide diff stats

  1. 28  django/utils/_os.py
28  django/utils/_os.py
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@@ -0,0 +1,28 @@
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+"""
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+A back-ported version of the same module from the 1.0.x branch, without the
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+unicode support.
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+"""
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+
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+from os.path import join, normcase, abspath, sep
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+
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+def safe_join(base, *paths):
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+    """
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+    Joins one or more path components to the base path component intelligently.
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+    Returns a normalized, absolute version of the final path.
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+
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+    The final path must be located inside of the base path component (otherwise
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+    a ValueError is raised).
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+    """
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+    # We need to use normcase to ensure we don't false-negative on case
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+    # insensitive operating systems (like Windows).
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+    final_path = normcase(abspath(join(base, *paths)))
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+    base_path = normcase(abspath(base))
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+    base_path_len = len(base_path)
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+    # Ensure final_path starts with base_path and that the next character after
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+    # the final path is os.sep (or nothing, in which case final_path must be
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+    # equal to base_path).
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+    if not final_path.startswith(base_path) \
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+       or final_path[base_path_len:base_path_len+1] not in ('', sep):
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+        raise ValueError('the joined path is located outside of the base path'
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+                         ' component')
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+    return final_path

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