README

Backend module extracted from an internal extension

Orignal authors: Andreas Nedbal, Christine Zoglmeier, Oliver Eglseder

Changelog:

Enhancements / Bugfixes

Refactored indexAction() to fully support partial imports and display results reliably.
Added importAttempted flag to always show import results, including success/failure counts.
Added row-level validation:
- Email format (GeneralUtility::validEmail)
- Group title empty check
- Group title max length based on TCA['fe_groups']['columns']['title']['config']['max']
Row-level errors are tracked in $rowErrors for table display in backend.
Implemented caching for:
- Existing frontend users per PID ($existingUsersCache)
- Frontend groups per PID ($groupsCache)
Updated subscribeFrontendUser() to:
- Update groups for existing users (including disabled users) without changing other fields.
- Return 'insert' | 'update' | 'skip' for counting purposes.
- Update cache dynamically to avoid repeated DB queries.
Preloaded existing users with preloadExistingUsers() for performance improvement.
Ensured passwords are generated securely and never communicated externally.
Form-level argument validation separated from row-level errors.
Use Doctrine\DBAL\QueryBuilder with proper restriction handling (DeletedRestriction)
Optimized XLSX import loop for large files (1–2k rows).
Removed unnecessary 0 group values when updating usergroups.
Cleaned template integration to display:
- Counts (inserted, updated, skipped)
- Row-level error table
- Form always below results for repeated imports.