feat: Add Backblaze B2 Cloud Storage integration #8683
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Add complete support for Backblaze B2 Cloud Storage as a storage backend, providing S3-compatible import/export functionality for Label Studio. This implementation includes: Backend Changes: - B2 storage models with import/export support (models.py) - S3-compatible boto3 integration with B2-specific endpoints - Serializers with enhanced validation and error messages - Database migrations for B2 storage models - Comprehensive test coverage for B2 operations - Client connection caching for improved performance (~100ms per request) Frontend Changes: - B2 provider configuration UI with field validation - Backblaze cloud provider SVG icon (follows existing icon patterns) - Form fields for B2 Application Keys and endpoint configuration - Presigned URL settings and recursive scan options Implementation Details: - Uses boto3 with custom B2 S3-compatible endpoints - Supports both import and export storage operations - Implements presigned URLs for direct browser access - Follows established patterns from S3 and Azure integrations - Includes proper error handling and connection validation Testing: - Unit tests for B2 models and utilities - Connection validation tests - Import/export functionality verification Breaking Changes: None
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Reason for Change:
Label Studio previously supported S3 and Azure storage backends but lacked native support for Backblaze B2 Cloud Storage.
This PR introduces full B2 integration, enabling import and export via Backblaze’s S3-compatible API.
The change expands Label Studio’s storage interoperability and provides an additional cost-efficient, scalable backend option.
Screenshots:
Backend: N/A (no visible changes)
Frontend:
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Testing:
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