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@chandra-siri chandra-siri commented Dec 9, 2025

feat: Support urllib3 >= 2.6.0

Context:

  • This library implements a custom decoders ( _GzipDecoder , _BrotliDecoder ) which inherit from urllib3.response.ContentDecoder
  • Interface of urllib3.response.ContentDecoder was changed in 2.6.0 to fix security vulnerability for highly compressed data reads. (Decompression bombs)

Hence we need to change our interfaces as well.

Changes

  • Add max_length param on decompress method, provide default value of -1 (same as urllib3's decompress)
  • Provide backwards compatibility ( ie urllib3 <= 2.5.0)

@product-auto-label product-auto-label bot added size: s Pull request size is small. api: storage Issues related to the googleapis/python-storage API. labels Dec 9, 2025
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Summary of Changes

Hello @chandra-siri, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the download functionality by integrating support for urllib3's custom decoder, specifically by introducing a max_length parameter to control decompression limits. It also includes a robust backward compatibility mechanism to ensure smooth operation across different urllib3 versions.

Highlights

  • urllib3 custom decoder support: The decompress methods in _BaseDecoder and _BrotliDecoder have been updated to support urllib3's custom decoder by accepting a new max_length parameter.
  • Backward compatibility: A try-except TypeError block has been introduced to ensure backward compatibility with urllib3 versions older than 2.6.0, which do not support the max_length parameter in their decompress method.
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Code Review

This pull request adds support for urllib3's max_length parameter in the custom _GzipDecoder and _BrotliDecoder to align with newer urllib3 APIs. The implementation correctly maintains backward compatibility with older urllib3 versions (pre-2.6.0) by using a try...except TypeError block. The changes are logical and well-implemented. My feedback is focused on improving the clarity of comments within these compatibility blocks to enhance long-term code maintainability.

@chandra-siri chandra-siri changed the title feat: Support urllib3's custom decoder, add max_length param feat: Support urllib3 >= 2.6.0 Dec 9, 2025
@chandra-siri chandra-siri marked this pull request as ready for review December 9, 2025 13:43
@chandra-siri chandra-siri requested review from a team as code owners December 9, 2025 13:43
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/gemini review

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Code Review

This pull request updates the custom Gzip and Brotli decoders to be compatible with urllib3 v2.x, which introduced a max_length parameter to the decompress method to mitigate decompression bomb vulnerabilities. The changes add this parameter to the custom decoders and use a try-except block for backward compatibility with older urllib3 versions.

My review focuses on improving the implementation of this backward compatibility. I've suggested replacing the try-except blocks with an explicit version check at import time, which is cleaner and more performant. I also identified a bug in the new has_unconsumed_tail property for the Brotli decoder that would cause an AttributeError with older urllib3 versions and provided a fix. Overall, the changes are in the right direction to support modern urllib3 versions.

@chandra-siri chandra-siri merged commit 57405e9 into googleapis:main Dec 9, 2025
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chandra-siri added a commit that referenced this pull request Dec 9, 2025
🤖 I have created a release *beep* *boop*
---


##
[3.7.0](v3.6.0...v3.7.0)
(2025-12-09)


### Features

* Auto enable mTLS when supported certificates are detected
([#1637](#1637))
([4e91c54](4e91c54))
* Send entire object checksum in the final api call of resumable upload
([#1654](#1654))
([ddce7e5](ddce7e5))
* Support urllib3 &gt;= 2.6.0
([#1658](#1658))
([57405e9](57405e9))


### Bug Fixes

* **bucket:** Move blob fails when the new blob name contains characters
that need to be url encoded
([#1605](#1605))
([ec470a2](ec470a2))

---
This PR was generated with [Release
Please](https://github.com/googleapis/release-please). See
[documentation](https://github.com/googleapis/release-please#release-please).

---------

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
Co-authored-by: Chandra Shekhar Sirimala <[email protected]>
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