fix: download_file/download_files crash on binary content with UnicodeDecodeError#257
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…eDecodeError
download_file() and download_files() crashed with UnicodeDecodeError
when the API returned binary content (PNG, JPEG, PDF) as base64-encoded
blobs, because .decode("utf-8") was called unconditionally on decoded
blob bytes.
Fix uses try/except to decode UTF-8 where possible (preserving str
return for backwards compatibility) and falls back to raw bytes for
true binary content. Return type annotations updated to
Union[str, bytes].
Add tests covering both the binary-returns-bytes and
utf8-blob-returns-str paths for download_file and download_files.
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sundargthb
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Summary
download_file()anddownload_files()crashed withUnicodeDecodeErrorwhen the API returned binary content (PNG, JPEG, PDF) as base64-encoded blobs.decode("utf-8")was called unconditionally on decoded blob bytesstrreturn for backwards compatibility) and falls back to rawbytesfor true binary contentUnion[str, bytes]Test plan
uv run pytest tests/bedrock_agentcore/tools/test_code_interpreter_client.py -v)test_download_file_binary— PNG header bytes returned asbytestest_download_files_binary— mixed text/binary multi-file downloadtest_download_file_blob_utf8_returns_str— UTF-8-valid blob returned asstrtest_download_files_blob_utf8_returns_str— same for multi-file variantreproduce_bug.pyconfirms bug no longer reproducesvalidate_readfiles_binary.pypasses 10/10