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Add support for generating and using GCS signed policy documents for file uploads.

This change adds:

  1. SignedPolicyDocument class in src/clusterfuzz/_internal/google_cloud_utils/storage.py to represent the policy document.
  2. get_signed_policy_document function in storage.py to generate the document using generate_signed_post_policy_v4.
  3. upload_using_signed_policy_document function in src/clusterfuzz/_internal/system/fast_http.py to upload files using the generated policy document via aiohttp.

This functionality enables uploading testcases (or other files) directly to GCS using a signed policy, which is useful for clients that need to upload files securely without direct GCS credentials.


PR created automatically by Jules for task 8538793473027729302 started by @jonathanmetzman

This change introduces the ability to create signed policy documents for GCS uploads in `storage.py` and consume them in `fast_http.py` for uploading files.

- Added `SignedPolicyDocument` class and `get_signed_policy_document` in `storage.py`.
- Added `upload_using_signed_policy_document` async function in `fast_http.py`.
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@jonathanmetzman jonathanmetzman requested review from hunsche and javanlacerda and removed request for hunsche and javanlacerda December 16, 2025 01:06
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