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fix(example): prevent path traversal in file-listing server - #315
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Bound every client-supplied path in the file-listing example to the server's working directory. list_files, get_file_info, file://read and watch_files now resolve paths against an explicit root and reject any destination that escapes it, including '..' traversal and symlinks resolved after fs.realpath. This hardening addresses GHSA-3439-r3q5-g34g.
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The file-listing example passed client-supplied paths straight to
join(process.cwd(), path), so itslist_files,get_file_info,file://read, andwatch_filesoperations accepted../traversal and could reach files outside the working directory with the privileges of the server process. Thefile://readresource also percent-decoded itspathquery parameter throughURLSearchParamsbefore touching the filesystem.This change resolves every destination against an explicit root and rejects anything that escapes it. Containment is checked against the symlink-resolved path so a symlink pointing outside the root is rejected too. This hardens the example without changing the library itself, addressing GHSA-3439-r3q5-g34g.