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23 lines
1.0 KiB
23 lines
1.0 KiB
from os.path import join, normcase, abspath, sep |
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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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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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