fileservice: add ObjectStorageArguments.shouldLoadDefaultCredentials

[reusee]

What type of PR is this?

• API-change
• BUG
• Improvement
• Documentation
• Feature
• Test and CI
• Code Refactoring

Which issue(s) this PR fixes:

issue #15154

What this PR does / why we need it:

refine no credentials rules.

[matrix-meow]

@reusee Thanks for your contributions!

Pull Request Review:

Title:

The title of the pull request is clear and specific, indicating that a new function shouldLoadDefaultCredentials is being added to the ObjectStorageArguments struct in the fileservice package.

Body:

The body of the pull request provides information about the type of PR (Improvement), the related issue (#15154), and the purpose of the changes, which is to refine the no credentials rules.

Changes:

1. In aliyun_sdk.go, o.NoDefaultCredentials check is replaced with a call to o.shouldLoadDefaultCredentials().
2. In aws_sdk_v2.go, similar to aliyun_sdk.go, o.NoDefaultCredentials check is replaced with a call to o.shouldLoadDefaultCredentials().
3. In minio_sdk.go, the logic is inverted where !args.NoDefaultCredentials check is replaced with args.shouldLoadDefaultCredentials().
4. A new method shouldLoadDefaultCredentials() is added to object_storage_arguments.go to determine whether default credentials should be loaded based on certain conditions.

Feedback and Suggestions:

1. Security Concerns:

   • The addition of shouldLoadDefaultCredentials() method introduces a potential security issue. The current implementation allows default credentials to be loaded if RoleARN and ExternalID are provided, even if NoDefaultCredentials is set to true. This could lead to unintended access if default credentials are loaded when they should not be.
   • Suggestion: Revise the logic in shouldLoadDefaultCredentials() to ensure that default credentials are not loaded when NoDefaultCredentials is set to true, regardless of the values of RoleARN and ExternalID.

2. Code Optimization:

   • The logic in shouldLoadDefaultCredentials() can be simplified for better readability and maintainability.
   • Suggestion: Refactor the method to have a clearer and more concise implementation, possibly by breaking down the conditions into separate checks or using a more straightforward approach.

3. Consistency:

   • Ensure consistency in handling default credentials across different SDKs (aliyun_sdk.go, aws_sdk_v2.go, minio_sdk.go).
   • Suggestion: Review and align the logic for default credentials loading in all SDK implementations to maintain consistency and avoid confusion.

4. Error Handling:

   • When default credentials are not loaded, consider providing more specific error messages to aid in troubleshooting.
   • Suggestion: Improve the error messages to provide detailed information about why default credentials are not being loaded, helping users understand and resolve the issue effectively.

5. Testing:

   • Verify that the new logic introduced by shouldLoadDefaultCredentials() is thoroughly tested to ensure correct behavior under various scenarios.
   • Suggestion: Add unit tests to cover different cases (e.g., when NoDefaultCredentials is true, when RoleARN and ExternalID are provided, etc.) to validate the functionality and prevent regressions.

6. Documentation:

   • Update the documentation to reflect the changes made, especially regarding the new method shouldLoadDefaultCredentials().
   • Suggestion: Include details about the purpose, behavior, and usage of shouldLoadDefaultCredentials() in the code comments or documentation for better understanding by developers.

By addressing the security concerns, optimizing the code logic, ensuring consistency, improving error handling, conducting thorough testing, and updating documentation, the pull request can enhance the quality and reliability of the codebase.