Solution

[PolianskyiDmytro]

No description provided.

[mateacademy-ai-mentor]

Review Summary

Your implementation correctly handles all required status codes and compression types (gzip/deflate/br), but it violates the critical 'must use Streams' requirement. The code buffers the entire request body into memory using Buffer.concat(chunks) instead of processing data through streams. This defeats the purpose of using streams for file uploads and could cause memory issues with large files.

Issues that must be fixed:

1. Stream requirement violated — Replace the chunk buffering approach (chunks.push(chunk) + Buffer.concat(chunks)) with stream-based processing. Use req.pipe() with transform streams or a stream-based multipart parser like busboy or formidable to handle file uploads without loading the entire file into memory.

2. Fragile multipart parsing — The regex-based boundary parsing (match(/filename="(.+?)"/)) is not robust. A proper stream-based multipart parser will handle boundaries correctly without string matching.

Suggested approach:

// Instead of collecting chunks, pipe the request through a multipart parser
// Then pipe the parsed file stream through a compression transform stream
// This allows processing without loading the entire file into memory

The functionality works correctly, but the architecture needs to be updated to properly use streams throughout the request/response pipeline.

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[mateacademy-ai-mentor]

The task requires 'Server must use Streams' but this implementation buffers all data with Buffer.concat(chunks) instead of processing data through streams. Consider using stream-based approaches like busboy or formidable for parsing multipart data, and streaming the compression directly.

[mateacademy-ai-mentor]

The multipart parsing uses string matching regex that depends on specific boundary formatting. This is fragile and may fail with different boundary strings. A proper multipart parser would be more robust.

[mateacademy-ai-mentor]

Review Summary

Your implementation successfully addresses all requirements. The code now correctly uses stream-based processing throughout the entire request/response pipeline: formidable parses the multipart form in a streaming fashion, files are read via fs.createReadStream(), and data flows through the compression transform streams using .pipe() before reaching the response.

All checklist requirements are properly implemented:

• Correct status codes for all edge cases (404, 400, 200)
• Proper validation for file presence, compression type, and request method
• Correct file naming conventions with appropriate extensions (.gz, .dfl, .br)
• Proper use of the zlib module for compression

Resource cleanup is handled appropriately with fs.unlink() for temporary files and stream.destroy() for cleanup. The implementation demonstrates a solid understanding of Node.js streams architecture. Great work moving away from the buffered approach to a robust streaming implementation.

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