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feat: enable AWS login credentials for Bedrock auth (#21623)

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## Summary

Codex's Amazon Bedrock provider signs Mantle requests with SigV4 using
credentials resolved by the AWS SDK. That worked for standard AWS
profiles and environment credentials, but AWS CLI console-login profiles
created by `aws login` require the SDK's `credentials-login` feature to
resolve `login_session` credentials.

This change enables that credential provider so Bedrock can use AWS
console-login credentials through the existing provider-owned AWS auth
path.

While testing the console-login path, we also hit a Mantle-specific
SigV4 regression from the new split between `session_id` and
`thread_id`. Mantle does not preserve legacy OpenAI compatibility
headers that use `snake_case` before SigV4 verification, so signing
those headers can make the server reconstruct a different canonical
request. The Bedrock auth path now removes that header class before
signing, keeping preserved hyphenated Codex/AWS headers such as
`x-codex-turn-metadata` signed normally.

## Changes

- Enable `aws-config`'s `credentials-login` feature in
`codex-rs/aws-auth`.
- Add a compile-time regression test for
`aws_config::login::LoginCredentialsProvider`.
- Strip `snake_case` compatibility headers from Bedrock Mantle SigV4
requests before signing.
- Expand the Bedrock auth regression test to cover `session_id`,
`thread_id`, and future headers of the same shape.
- Refresh Cargo and Bazel lockfiles for the added `aws-sdk-signin`
dependency.

## Tests
- tested with `aws login` locally and verified that it works as
intended.
This commit is contained in:
Celia Chen authored and GitHub committed 2026-05-08 04:07:59 +00:00
1 parent 314229fd72
commit 9cbd4c0371
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codex-rs/Cargo.lock
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