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# Utility Packages

The `pkg` directory contains shared utilities and functionality:

- [pkg/common/](mdc:pkg/common): Common middleware and shared functionality
- [pkg/constant/](mdc:pkg/constant): Constants used throughout the application
- [pkg/jwt/](mdc:pkg/jwt): JWT authentication utilities
- [pkg/oss/](mdc:pkg/oss): Object Storage Service client implementation
- [pkg/sms/](mdc:pkg/sms): SMS service integration
- [pkg/utils/](mdc:pkg/utils): General utility functions
- [pkg/httpclient/](mdc:pkg/httpclient): HTTP client utilities

These packages provide reusable components that can be used across different parts of the application without creating circular dependencies.