Downloads fail on Linux containers when filenames contain square
brackets or multiple consecutive spaces. On Linux, .NET's
Path.GetInvalidFileNameChars() only returns NUL and '/', so characters
like [ ] { } that cause issues with shell globbing, URI handling, and
various download clients pass through the existing filter unchanged.
Add FilenameSanitizer that:
- Strips square brackets, curly braces, and control characters
- Collapses multiple consecutive spaces into one
- Trims leading and trailing whitespace
- Preserves parentheses and all other characters
Apply sanitization at filesystem boundaries: DownloadHelper (where the
Real-Debrid filename is turned into a local path), UnpackClient,
Torrent delete / RunOnTorrentComplete, and the qBittorrent / SABnzbd
status paths that *arr reads back. Aria2c and DownloadStation also
sanitize their remote output paths so they match the sanitized local
filePath. Symlink's rclone-mount lookup still uses the original name
since that has to match the real file in the mount.
Add a SanitizeFilenames toggle in DbSettings (default on) so users
can disable the behaviour if they need the exact Real-Debrid name.
- Applied to TorBox, can be extended easily to other providers
- Reads response headers commonplace for pre-emptive rate limit throttling and retry-after
- When a rate limit is reached, displays a warning in the UI
- Fix socket leak from direct allocation of HttpClient, replaced with factory which handles pooling and re-use of sockets.
While HttpClient is Disposable, it doesn't gaurantee (and does not) directly release underlying sockets for queries at the time the client is disposed. These sockets will go into a TCP WAIT state often for a very long time. The expected pattern in C# is to always use the HttClientFactory which will correctly handle re-use of the OS sockets in suqsequent queries reducing resource and memory leaks.
*Most* debrid providers know the filename as soon as they know the restricted links. By allowing them to tell the program this at an earlier stage, we don't need the `GetFileName` call for most debrid providers
