Feat: .strm downloader

[Cucumberrbob]

closes #838

Adds a new downloader: the .strm downloader.

This PR is currently marked as draft as in its current state it won't work well with TorBox and I haven't tested with anything other than AD so there may be other issues.

I'd like to also fi​x #336 and use the AD "Save Link" feature for .strm downloads
TorBox really should use the redirect=true links since the unrestricted ones only last a few hours.
I don't know about quirks of DL or PM yet.

[qodo-code-review]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

🎫 Ticket compliance analysis 🔶 838 - PR Code Verified Compliant requirements: • Implement ability to download physical .strm files instead of full video files • Create a separate internal download client for .strm files • Handle .strm files exactly like video files (same download process) Requires further human verification: • Remove torrent from client and provider post download • Support Sonarr handling the import of .strm files • Enable removal of downloads from RD library after download • Eliminate overhead of managing mounting rclone share 336 - Not compliant Non-compliant requirements: • Add option in RDT settings to save links on Alldebrid • Support Alldebrid "Save Link" feature

⏱️ Estimated effort to review: 3 🔵🔵🔵⚪⚪

🧪 PR contains tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Return Value The Download method returns a random GUID string which doesn't represent any meaningful download identifier or status, potentially breaking expected behavior for callers expecting a proper download ID or path. return Guid.NewGuid().ToString(); } Missing Validation No validation is performed on the downloadLink parameter before writing to file, which could result in invalid .strm files if the link is malformed or empty. await fileSystem.File.WriteAllTextAsync(filePath + ".strm", downloadLink);

[qodo-code-review]

PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Impact
General	Validate URL before file creation The code doesn't validate if the downloadLink is a valid URL before writing it to the file. Adding URL validation would prevent creating invalid .strm files that media players cannot process. server/RdtClient.Service/Services/Downloaders/StrmDownloader.cs [14] +if (!Uri.TryCreate(downloadLink, UriKind.Absolute, out _)) +{ + throw new ArgumentException($"Invalid download link: {downloadLink}"); +} + await fileSystem.File.WriteAllTextAsync(filePath + ".strm", downloadLink); Apply / Chat Suggestion importance[1-10]: 7 __ Why: This is a good suggestion for improving the robustness of the StrmDownloader. Validating that the downloadLink is a valid URL before writing it to a .strm file prevents creating corrupt files and allows for earlier, more specific error reporting. The implementation using Uri.TryCreate is correct.	Medium
	Return meaningful file path value The method returns a random GUID regardless of success or failure, which doesn't provide meaningful information about the download operation. Consider returning the actual file path on success or null/empty string on failure to make the return value more informative. server/RdtClient.Service/Services/Downloaders/StrmDownloader.cs [10-28] public async Task<String> Download() { try { - await fileSystem.File.WriteAllTextAsync(filePath + ".strm", downloadLink); + var strmFilePath = filePath + ".strm"; + await fileSystem.File.WriteAllTextAsync(strmFilePath, downloadLink); DownloadComplete?.Invoke(this, new()); + return strmFilePath; } catch (Exception ex) { DownloadComplete?.Invoke(this, new() { Error = ex.Message }); + return String.Empty; } - - return Guid.NewGuid().ToString(); } Apply / Chat Suggestion importance[1-10]: 6 __ Why: The suggestion correctly identifies that returning a random GUID from the Download method is not very informative. Proposing to return the created file path on success and an empty string on failure makes the method's return value more useful for the caller, which is a good design improvement.	Low
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