Stacked commits for credential vending (draft, to be split) - #90
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hectorvent
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Adds the STS token-exchange endpoint used by Google Java DownscopedCredentials, a deliberately limited GCS CAB parser, global Floci credential token storage, and stored impersonated-token handling for later GCS enforcement. Implements the STS v1 form token-exchange contract needed by the Google Java auth-library downscoping flow. Verified with STS REST tests, CAB parser tests, token-store tests, disablement coverage, and compatibility-tests/sdk-test-java StsTokenExchangeTest against a running emulator. - [x] New feature (`feat:`) - [x] `./mvnw test` passes locally - [x] New or updated integration test added - [x] Commit messages follow Conventional Commits
Enforces Floci downscoped-token CAB rules across GCS object, upload, XML, compose, copy, rewrite, resumable, and batch paths while preserving existing bypass behavior for missing, static, and stored impersonated credentials. - [x] New feature (`feat:`) Implements the intentionally limited GCS Credential Access Boundary subset produced by the Google Java downscoped credentials flow. Verified with GcsAuthorizationTest, GcsScopedTokenRestIntegrationTest, existing GCS service coverage, and compatibility-tests/sdk-test-java GcsDownscopedTokenTest against a running emulator. - [x] `./mvnw test` passes locally - [x] New or updated integration test added - [x] Commit messages follow Conventional Commits
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