Add PGP metadata extraction and tests

[doomedraven]

Implemented a get_metadata() method in the PGP unpacker to identify PGP file types (public key, private key, encrypted message, signature) from both ASCII-armored and binary formats. Added unit tests to verify metadata extraction for various PGP data types. Improved resource cleanup in the unpack method.

[gemini-code-assist]

Summary of Changes

Hello @doomedraven, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the PGP unpacker by introducing robust metadata identification capabilities, allowing it to accurately classify PGP content as public keys, private keys, encrypted messages, or signatures. It also refines the unpacking process with more reliable resource management, ensuring a cleaner execution environment.

Highlights

• PGP Metadata Extraction: A new get_metadata() method has been implemented in the PGP unpacker to identify various PGP file types, including public keys, private keys, encrypted messages, and signatures.
• Support for ASCII and Binary Formats: The metadata extraction logic supports both ASCII-armored PGP data (by checking headers) and binary PGP data (by analyzing the initial tag byte).
• Improved Resource Cleanup: The unpack method now includes a finally block to ensure temporary files and directories are consistently cleaned up, regardless of whether the unpacking process succeeds or fails.
• Comprehensive Unit Tests: New unit tests have been added to verify the correct functionality of the get_metadata() method across different PGP data types and formats.

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[doomedraven]

@itamarga any though on making this proper recon? so we can discard directly if not msg right?

[gemini-code-assist]

Code Review

This pull request introduces a get_metadata method for PGP files to identify their type and adds corresponding unit tests. It also refactors the resource cleanup in the unpack method by using a finally block.

The resource cleanup improvement is a good change, but it has unfortunately introduced a critical bug in the unpack method, which no longer returns the unpacked files. I've left a comment with details on how to fix this.

I've also provided some feedback on the new get_metadata method to make it more complete and maintainable, along with suggestions to improve the test coverage for this new functionality.

[gemini-code-assist]

Code Review

This pull request introduces a get_metadata() method for the PGP unpacker to identify PGP file types, along with comprehensive unit tests. The resource cleanup in the unpack method has also been improved by using a finally block and cleaning up temporary directories on failure, which is a great enhancement for robustness.

My review focuses on improving the maintainability of the new code. I've suggested using constants for metadata strings to avoid hardcoding them, which makes the code cleaner and less prone to errors. Additionally, I've proposed refactoring the new test file to use a data-driven approach with subTest, which will reduce code duplication and make it easier to add new test cases in the future.

Overall, this is a solid contribution that adds valuable functionality and improves resource management.