app/django/utils/_os.py
author Lennard de Rijk <ljvderijk@gmail.com>
Mon, 08 Jun 2009 22:28:17 +0200
changeset 2410 cb136ce6c8d1
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Temporary fix for Issue 636 by turning off the caching of the page's entities. This also means that pagination is turned back on because querying all 1000 projects every time will take too long.

from os.path import join, normcase, abspath, sep
from django.utils.encoding import force_unicode

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).
    base = force_unicode(base)
    paths = [force_unicode(p) for p in paths]
    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