feat(email_message): encapsulate EmailMessage and Attachment struct with private fields and add constructors

[JRocabruna]

Encapsulate EmailMessage and Attachment struct with private fields and add constructors

Fixed vulnerability GO-2024-2887 from package net/netip@go1.22.3

Description

This pull request encapsulates the EmailMessage and Attachment structs by making their variables private. It adds getters and setters for these variables and implements custom MarshalJSON and UnmarshalJSON methods. Additionally, constructors for creating Attachment from a filename and content, as well as from a file path, have been added. A testdata folder is created for adding test files.

This pull request also updates the Go version to 1.22.4 to address the GO-2024-2887 vulnerability found in the net/netip package.

• Related Issue: Closes [FEATURE] - Refactor EmailMessage Struct to Use Private Fields and Constructor for Enhanced Encapsulation and Data Integrity #5 [BUG] - GO-2024-2887 Vulnerability in net/netip Package #15
• Type of Change:
  • New feature (non-breaking change which adds functionality)
  • Security fix (non-breaking change which addresses a vulnerability)

Checklist

Please ensure the following guidelines are met:

• The code follows the style guidelines of this project.
• A self-review has been performed on the code.
• The code is well-documented, and comments have been added where necessary.
• Tests have been added to prove that the fix is effective or that the feature works. All existing tests pass.
• Commit messages follow the convention type(scope): description.
• The pull request has no conflicts with the base branch.
• Any dependent changes have been merged and published in downstream modules.

Additional Information

• Encapsulated the EmailMessage struct by making variables private.
• Added getters and setters for EmailMessage variables.
• Implemented custom MarshalJSON and UnmarshalJSON methods for EmailMessage.
• Encapsulated the Attachment struct by making variables private.
• Added getters and setters for variables.
• Implemented custom MarshalJSON and UnmarshalJSON methods for Attachment.
• Added a constructor for creating Attachment from filename and content.
• Added a constructor for creating Attachment from a file path.
• Created a testdata folder for adding test files.
• Updated Go version to 1.22.4 to address the GO-2024-2887 vulnerability in the net/netip package.

[DarkRockMountain-admin]

Comments

Great job encapsulating the structs and addressing the vulnerability. The constructors and updated JSON methods enhance the module's usability.

Review Checklist

• Code adheres to the project's coding guidelines.
• Changes are well-documented.
• Tests have been added/updated and pass successfully.
• Commit messages follow the correct format: type(scope): description.
• No conflicts with the base branch.

Approval

Approved: Changes look good and meet the project's contribution standards.