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@ynsta ynsta commented Oct 29, 2025

Add linter and propose fixes by flash pro and improvement from a ai assisted review with opus 4.1.

ynsta added 4 commits October 30, 2025 11:35
Signed-off-by: Stany MARCEL <[email protected]>
This commit resolves a variety of issues reported by golangci-lint, leading to significant improvements in code quality, error handling, and maintainability.

Key changes include:

- **Error Handling:** Added checks for previously unhandled errors, particularly from `io.ReadAll` and `strconv.Atoi`, to make the application more robust.
- **Code Complexity:** Refactored several complex functions (`object.get`, `object.put`, `router.getHandler`) to reduce their cognitive and cyclomatic complexity, making them easier to understand and maintain.
- **Logging:** Standardized the logging mechanism to use `logrus` consistently across all packages by updating the S3 client initialization and middleware.
- **Security:** Addressed `gosec` warnings by adding comments to acknowledge the necessary use of MD5 for S3 compatibility.
- **Code Cleanup:** Removed unused variables, parameters, and empty code blocks to improve code clarity.
- **Static Analysis:** Fixed various static analysis warnings related to redundant selectors and variable declarations.

Signed-off-by: Stany MARCEL <[email protected]>
This commit enhances code quality by implementing improvements
identified during review, resolving all golangci-lint issues.

Key improvements:
- Add configuration validation module with startup checks
  * Validate S3 bucket names according to AWS naming rules
  * Validate object keys with path traversal protection
  * Implement content length validation (5GB limit)
  * Add host configuration format validation

- Improve error handling consistency across the codebase
  * Fix error propagation in S3 client (errors now properly returned)
  * Add proper error wrapping with context using fmt.Errorf
  * Ensure all errors result in appropriate HTTP responses
  * Improve error messages to avoid exposing internal details

- Enhance request validation and security
  * Validate bucket/key names before processing requests
  * Add content length validation for PUT requests

- Fix resource management issues
  * Add proper defer statements for response body closure
  * Fix missing KEK (Key Encryption Key) initialization
  * Improve handling of client disconnections
  * Add versionID support throughout request flow

Affected files:
- NEW: s3proxy/internal/config/validation.go
- s3proxy/cmd/main.go: Add startup validation
- s3proxy/internal/s3/s3.go: Fix error handling
- s3proxy/internal/router/router.go: Add input validation
- s3proxy/internal/router/object.go: Improve error handling and cleanup
- s3proxy/internal/router/handler.go: Fix KEK initialization and cleanup

Signed-off-by: Stany MARCEL <[email protected]>
This commit introduces comprehensive technical documentation to the S3Proxy project.

__README.md updates:__

- Added a detailed "Technical Details" section covering the architecture, encryption/decryption flows (PUT/GET), key components (`main`, `router`, `s3`, `crypto`), and default blocking of multipart uploads.
- Documented the main Go libraries used for configuration (`koanf`), logging (`logrus`), AWS S3 interaction (`aws-sdk-go-v2/service/s3`), and cryptography (`tink-go/v2`).
- Provided an in-depth explanation of the Helm chart deployment, including configurable parameters from `values.yaml` and its role in Kubernetes deployments.

__CONTRIBUTING.md updates:__

- Added a "Linting" subsection, detailing the use of `golangci-lint` for static code analysis.
- Listed the enabled linters from `.golangci.yml` and provided instructions on how to run the linter.
- Clarified the recommended development environment setup using Docker and VSCode's "Attach to Running Container" feature.

Signed-off-by: Stany MARCEL <[email protected]>
The is* validation functions already check HTTP methods internally,
making the switch statement unnecessary. Added comments for clarity.

Signed-off-by: Stany MARCEL <[email protected]>
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