Support aws_session_token for S3 backends - #2462
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Apr 27, 2026
Support aws_session_token for S3 backends
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This pull request adds support for AWS session tokens throughout the S3 data backend, ensuring compatibility with temporary AWS credentials (such as those used with IAM roles or STS). The changes update the configuration, backend initialization, and S3 connection logic to accept and use an
aws_session_tokenparameter.Key changes include:
AWS session token support in configuration:
aws_session_tokenas an optional field toImageBackendConfigand included it in serialization and deserialization logic insimpletuner/helpers/data_backend/config/image.py. [1] [2] [3]aws_session_tokenin the passthrough keys forTextEmbedConfiginsimpletuner/helpers/data_backend/config/text_embed.py.Backend and connection logic updates:
S3DataBackendand its builder to accept and propagate theaws_session_tokenparameter, ensuring it is passed to the underlying boto3 S3 client insimpletuner/helpers/data_backend/aws.pyandsimpletuner/helpers/data_backend/builders/aws.py. [1] [2] [3] [4] [5]aws_session_tokenfor authentication insimpletuner/helpers/data_backend/aws.py. [1] [2]