Licensedb integration

[MahmoudSheemy127]

Initial PR for GSOC 26's project

LicenseDB Integration layer initial implementation.

Changes

• Implementation of LicenseDB Rest client for LicenseDB integration
• The following endpoints are implemented:
  • /api/v1/login
  • /api/v1/refresh
  • /api/v1/licenses
  • /api/v1/licenses/:id
• The following files are created under backend/licenses-core/../java/LicenseDB:
  • config/LicenseDBConfig.java: Configurations for RestTemplate and ConfigurationRepository
  • config/LicenseDBRestConfig.java: To fetch configuration parameters for the LicenseDB Rest client through the Configuration Repository.
  • dtos/License_db: Definition for the License object fetched from LicenseDB
  • rest/LicenseDBRestClient: Rest client class implementation for LicenseDB. Rest methods are implemented for the mentioned endpoints.
  • LICENSEDB_INTEGRATION.md: Complete implementation details for the LicenseDB Rest client interface

How to use

Example usage for the LicenseDB Rest client in LicenseDatabaseHandler.java:

public class LicenseDatabaseHandler{
    ...

    private final LicenseDBRestClient licenseDBRestClient;

    public LicenseDatabaseHandler(...) {
        ...
        licenseDBRestClient = new LicenseDBRestClient();


    }


    public List<License> getLicenseSummary() {

    final List<License> licenses;

    List<License_db> licenses_db = licenseDBRestClient.getLicenses();
    
    // Mapping Layer licenses_db ->  licenses (To be implemented)
    
    return licenses;

    }

}

Dependencies

Issue #3934

Suggested Reviewers

@GMishx

[ADITYA-CODE-SOURCE]

Great initial implementation, @MahmoudSheemy127!
I've been working on complementary components for this GSoC project and reviewed your code:
✓ REST client structure - Clean separation of concerns
✓ Configuration setup - Well organized Spring integration
✓ DTO definitions - Matches LicenseDB API schema

A few suggestions from my related PRs that could enhance this:

1. Exception handling (PR feat(licensedb): Add exception handling classes for error management #3894) - Custom exception classes for granular error handling
2. Data transformation layer (PR feat(licensedb): Add data transformation layer for LicenseDB integration #3898) - Your mapping layer marked "to be implemented", I have LicenseTransformer/ObligationTransformer ready
3. Conflict resolution (PR feat(licensedb): Add conflict resolution module for data synchronization #3911 - open) - For handling sync conflicts
   Additional components I've implemented:

• OAuth retry mechanism with exponential backoff for resilient authentication
• Persistence layer for storing sync metadata
  Happy to collaborate and coordinate our PRs to provide complete LicenseDB integration.
  Looking forward to mentors' feedback! @GMishx

[MahmoudSheemy127]

@ADITYA-CODE-SOURCE,

Glad to hear from you.

I have reviewed your PRs and they are in fact completing the remaining implementation details required for the LicenseDB integration through a rest client. Good Job

As you know this PR is just for an initial implementation of my proposed solution to the project for GSoC 2026. It will be great if we can elaborate together and work together on the project and merge our PRs prior to GSoC 2026.

Looking forward to mentor's @GMishx feedback suggesting if we can work together on the project as it would be a greate chance.