Implement BibEntryResource — Fixes #13588

[UserEstrella]

Closes _____

Summary

This pull request implements the BibEntryResource as described in issue #13588.

Since the issue was created some time ago, several structural changes occurred in the project. Therefore, some of the initial instructions were no longer applicable, and adjustments were made accordingly.

Changes Made

• Worked mainly within the jabsrv module.
• Created a new file:
  jabref/jabsrv/src/main/java/org/jabref/http/server/resources/BibEntryResource.java
• Moved all relevant methods from LibraryResource.java that contained the @PathParam("id") parameter — except the one annotated with @Path("entries/pdffiles") — into BibEntryResource.java.
• Copied additional helper methods from LibraryResource that were required for these methods to work properly.
• Updated the startServer() method in the Server class to include a reference to the new BibEntryResource.
• Created a corresponding test class:
  jabref/jabsrv/src/test/java/org/jabref/http/server/BibEntryResourceTest.java,
  based on the existing LibraryResourceTest.java.

Steps to test

To verify the implementation:

1. Start the GUI project (jabgui).
2. Launch the server with:

   ./gradlew :jabsrv-cli:run
   

Mandatory checks

• I own the copyright of the code submitted and I license it under the MIT license
• I manually tested my changes in running JabRef (always required)
• I added JUnit tests for changes (if applicable)
• [/] I added screenshots in the PR description (if change is visible to the user)
• I described the change in CHANGELOG.md in a way that is understandable for the average user (if change is visible to the user)
• [/] I checked the user documentation: Is the information available and up to date? If not, I created an issue at https://github.com/JabRef/user-documentation/issues or, even better, I submitted a pull request updating file(s) in https://github.com/JabRef/user-documentation/tree/main/en.

[github-actions]

Hey @UserEstrella!

Thank you for contributing to JabRef! Your help is truly appreciated ❤️.

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[UserEstrella]

Error BibEntryResource.java is not recognized in Server.java

[UserEstrella]

JBang build not passing, don't recognize BibEntryResource, need to fix structure and retry

[palukku]

JBang build not passing, don't recognize BibEntryResource, need to fix structure and retry

In order for jbang to work you need to add the class to the https://github.com/JabRef/jabref/blob/main/.jbang/JabSrvLauncher.java file as a source

[koppor]

Please also adapt jabsrv/src/test/rest-api.http and try out your new API.

[koppor]

I think, this is comment wrong, we are at the BibEntry resource

[UserEstrella]

Thank you for your feedback! Do you mean we should create a new specific end-point for the BibEntry resource? Something like this : <http://localhost:23119/librairies/demo/entries/{id}>?