Fix symlink bypass in file-serving path checks (CWE-59) - #1547
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Replace os.path.abspath() with os.path.realpath() in file-serving containment checks so symlinks are resolved before the startswith() comparison. Add trailing os.sep to prevent prefix collisions with sibling directories.
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Replace os.path.abspath() with os.path.realpath() in file-serving containment checks so symlinks are resolved before the startswith() comparison. Add trailing os.sep to prevent prefix collisions with sibling directories.
fix #1546