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Evan Mattson
b6f95e2c45
### Motivation and Context The Dapr Runtime uses string-based class names to load step classes dynamically. This PR adds validation to ensure that only valid KernelProcessStep subclasses can be loaded and instantiated, improving type safety and providing better error messages when misconfigured. The new allowed_module_prefixes parameter gives users control over which modules are permitted for step class loading, which can be useful in environments where stricter control is desired. <!-- Thank you for your contribution to the semantic-kernel repo! Please help reviewers and future users, providing the following information: 1. Why is this change required? 2. What problem does it solve? 3. What scenario does it contribute to? 4. If it fixes an open issue, please link to the issue here. --> ### Description - Add issubclass(cls, KernelProcessStep) validation when loading step classes from qualified names - Add optional allowed_module_prefixes parameter for restricting which modules can be loaded - Centralize class loading logic in get_step_class_from_qualified_name() utility function - Remove duplicate _get_class_from_string methods from DaprStepInfo and StepActor <!-- Describe your changes, the overall approach, the underlying design. These notes will help understanding how your code works. Thanks! --> ### Contribution Checklist <!-- Before submitting this PR, please make sure: --> - [X] The code builds clean without any errors or warnings - [X] The PR follows the [SK Contribution Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md) and the [pre-submission formatting script](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md#development-scripts) raises no violations - [X] All unit tests pass, and I have added new tests where possible - [ ] I didn't break anyone 😄