ci: do not merge — CI for the #235–#237 stack on current main

[alukach]

Do not merge. data.source.coop runs its full CI only on pull requests into main, and #243 (feat/platform-trust into main) got none: the stack conflicts with main in adrs/004-sts.md, where main's ADR-014 amendment note (#232) and #236's note on the FullAccess and ReadOnly Roles were written into the same spot, and GitHub runs no pull_request workflows for a conflicting PR. This throwaway branch is #237's tip (f10d12a, containing #235's checksum commits d6745e0 and 30ad22f and #236) with main merged in and both notes kept, so CI can run on the stack as it will land. It will be closed once CI reports; the stack's own branches are unchanged, and #236 will need the same resolution when it is rebased onto main after #235 merges.

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Claude finished @alukach's task in 37s —— View job

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✅ No blocking issues — safe to merge. (This is a throwaway CI branch, so this is a review of the stack it carries.)

I read the src/, Cargo.toml and wrangler.toml diff. I did not read the tests/ or ADR changes, and I did not run CI or the tests.

Checked and fine

• keys::parse_api_key checks length and the alphanumeric charset before it slices rest[30..], so it can't panic.
• credentials_for calls clamp(900, max), which panics if max < 900. config.rs already floors STS_MAX_SESSION_DURATION_SECS at 900, so that's safe.
• The platform path refuses non-service-account ids before it verifies the token or signs anything.
• exp is required on platform tokens, and the audience list is per issuer.
• authorization_header refuses PROXY_SELF_SUBJECT, so a caller can't claim the proxy's own identity.
• The API key is only read from the form body. It is sent to the API only as a hash.

Non-blocking notes

• src/lib.rs sts_error_xml puts message into XML unescaped. with_request_id appends request_id to that message. If request_id comes from a client-supplied x-request-id, that is XML injection into the error body. I didn't check where request_id is set. If it's client-controlled, escape it or restrict it to [A-Za-z0-9-].
• within_rate_limit fails open when the STS_EXCHANGE_LIMIT binding is missing or the call errors. It logs an error, which is a reasonable choice, but a misconfigured deploy would have no limit on the exchange routes.

Simplify (ponytail)

• src/lib.rs exchange_platform_token takes 9 arguments and needs #[allow(clippy::too_many_arguments)]. Pass config, sts and request_id in one small context struct, or move the header parsing inside so it takes fewer.
• src/source_api/cache.rs cached_fetch is another #[allow(clippy::too_many_arguments)], now with method and body. Replace the pair with a small enum Request { Get, PostJson(&str) }.
• src/keys.rs key_hash formats each byte with format!. hex is not a dependency today, so this is fine. If hex ever comes in, use hex::encode.
• src/keys.rs checksum hand-rolls CRC-32. crc32fast would replace it, but it's a new dependency for about 10 lines, so keeping the hand-rolled version is reasonable.

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💰 Estimated review cost: $0.28 · 0m36s · 8 turns

[github-actions]

🚀 Latest commit deployed to https://source-data-proxy-pr-244.source-coop.workers.dev

• Date: 2026-09-29T23:56:08Z
• Commit: c8526b2

[alukach]

CI passed on the #235–#237 stack with main merged in (unit, integration, clippy, format, build, deploy & test, security audit; automated review: no blocking issues). Closing: this branch existed only for that run.