authorize-check for xlscollectionCrosswalk

[floriangantner]

References

• Fixes https://github.com/4Science/DSpace/issues/422

Description

Implement interface method for fine granular check to export these crosswalks to specific groups

Instructions for Reviewers

List of changes in this PR:

• implement isAuthorized method, which was before by default true by the interface ItemExportCrosswalk
  • add group check copied from other Crosswalk Formats
• whitebox-Tests: depending on the configuration check if the crosswalk format is offered to Anonymous/Administrator users in the context-menu.
• Introduced new IntegrationTest to check the isAuthorized function
• configuration: allow access to Administrator and Anonymous (behavior as before)

    <bean class="org.dspace.content.integration.crosswalks.XlsCollectionCrosswalk" id="xlsCrosswalkCollection">
        <property name="allowedGroups">
            <list>
                <value>Administrator</value>
                <value>Anonymous</value>
            </list>
        </property>
    </bean>

Checklist

• [x] My PR is small in size (e.g. less than 1,000 lines of code, not including comments & integration tests). Exceptions may be made if previously agreed upon.
• [x] My PR passes Checkstyle validation based on the Code Style Guide.
• [ ] My PR includes Javadoc for all new (or modified) public methods and classes. It also includes Javadoc for large or complex private methods.
• [x] My PR passes all tests and includes new/updated Unit or Integration Tests based on the Code Testing Guide.
• [ ] If my PR includes new libraries/dependencies (in any pom.xml), I've made sure their licenses align with the DSpace BSD License based on the Licensing of Contributions documentation.
• [ ] If my PR modifies REST API endpoints, I've opened a separate REST Contract PR related to this change.
• [x] If my PR includes new configurations, I've provided basic technical documentation in the PR itself.
• [x] If my PR fixes an issue ticket, I've linked them together.