feat: File hashing and duplicate prevention during import #7765
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Feature
This feature introduces the ability to record the SHA256 hash of uploaded files and prevent task creation from files that have a duplicate hash within the same project.
This functionality is controlled by the
DATA_UPLOAD_IGNORE_DUPLICATESenvironment variable. If set toTrue, files will be hashed, and duplicates (based on content hash) will be ignored during the import process.If
Falseor not set, the system behaves as before.Duplicate File Handling:
label_studio/core/settings/base.py: AddedDATA_UPLOAD_IGNORE_DUPLICATESsetting to allow skipping duplicate file uploads based on file hashes.label_studio/data_import/uploader.py: Addedget_file_hashfunction to compute SHA256 hashes for files and updatedcreate_file_uploadto check for duplicates using the hash. If duplicates are ignored, the function returnsNone. [1] [2]Database Changes:
label_studio/data_import/migrations/0003_fileupload_file_hash.py: Added a migration to introduce thefile_hashfield in theFileUploadmodel and populate it for existing records using thefull_files_hashfunction.label_studio/data_import/models.py: Updated theFileUploadmodel to include thefile_hashfield with indexing for efficient duplicate checks.Utility Functions:
label_studio/data_import/uploader.py: Added thefull_files_hashfunction to calculate hashes for allFileUploadinstances missing a hash, ensuring backward compatibility with existing records.