feat: add get forwarding functionality

[kleyow]

This pull request introduces enhancements to the ML API Adapter, focusing on improved handling of GET notification messages (including FX GET) and validation logic for transfer fulfilments. It also adds comprehensive unit tests for the new GET forwarding logic and increments the package version.

Notification GET request forwarding:

• Updated src/handlers/notification/index.js to detect and correctly forward GET and FX_GET notification messages with empty payloads as HTTP GET requests to the appropriate FSP endpoint, ensuring proper header construction, endpoint resolution, and error handling.

Transfer fulfilment validation:

• Modified src/api/transfers/handler.js to skip payload validation for transfer fulfilment requests originating from external participants (determined by absence of the fspiop-proxy header), allowing for more flexible integrations.

Testing improvements:

• Added unit tests in test/unit/handlers/notification/index.test.js to verify correct forwarding of GET and FX_GET notification messages, successful and failed forwarding scenarios, and appropriate audit tagging.

Versioning:

• Bumped the package version to 16.7.0-snapshot.3 in package.json.

[Copilot]

Pull request overview

This PR adds GET request forwarding functionality to support proxied participants in the ml-api-adapter service. The implementation enables the system to forward GET requests (queries) to proxied participants when there's no response payload, while maintaining backward compatibility for PUT responses when payload data is present.

Changes:

• Added GET request forwarding logic in the notification handler for proxy scenarios
• Modified fulfil transfer validation to skip when 'fspiop-proxy' header is present
• Added comprehensive test coverage for GET and FX-GET forwarding scenarios

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/handlers/notification/index.js	Added GET request forwarding logic with empty payload detection and proxy endpoint resolution
src/api/transfers/handler.js	Added conditional validation skip for proxy requests based on header presence
test/unit/handlers/notification/index.test.js	Added three new test cases covering GET forwarding success scenarios and error handling
package.json	Version bump to 16.7.0-snapshot.3
package-lock.json	Version updates and dependency changes including dev flag removals

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[Copilot]

Pull request overview

Copilot reviewed 5 out of 6 changed files in this pull request and generated 1 comment.

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[sonarqubecloud]

Quality Gate failed

Failed conditions
32.6% Duplication on New Code (required ≤ 3%)

See analysis details on SonarQube Cloud