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Cargo features are additive, so `rust_crypto` and `aws_lc_rs` can both be linked: feature unification across a dependency graph produces that build, and so does every tool reaching for `--all-features` (docs.rs and, in the Release-plz job, cargo-semver-checks). The `compile_error!` guard rejected it outright, which failed rustdoc and took the release workflow with it. - Drop the mutual-exclusion guard; the built-in verifier installs `aws_lc_rs` as the process provider when both are linked, since it is constant-time and free of the advisory `rust_crypto` carries. - Add an `--all-features` CI leg so the combination is built and tested on every PR, and move the suite to nextest. - Keep the release workflow unblocked: the published baseline the semver check compiles still carries the old guard, so it stays off until a release with this fix replaces it. Closes #83
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📝 SummarySummary by CodeRabbit
WalkthroughThe change allows both JWT crypto features together, installs ChangesJWT backend compatibility
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~30 minutes Change: Bug fix · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant ConfigVerifier
participant CryptoProvider
participant jsonwebtoken
ConfigVerifier->>CryptoProvider: install_default_provider()
CryptoProvider->>jsonwebtoken: install aws_lc_rs when both features are enabled
ConfigVerifier->>jsonwebtoken: build verifier
jsonwebtoken-->>ConfigVerifier: verify token
Merge Risk: 🔵 Low · up to The combined-backend behavior works for the current test case, but a future change could silently select the wrong crypto provider. Add a direct tie-break assertion before merging. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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🧪 Generate unit tests (beta)
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Inline comments:
In `@src/auth/tests.rs`:
- Around line 474-496: Update verifies_with_both_crypto_backends_linked to test
the provider-selection seam before global installation, asserting that the
tie-break selects aws_lc::DEFAULT_PROVIDER when both rust_crypto and aws_lc_rs
features are enabled. Do not use request success or
CryptoProvider::install_default() as evidence of the selected provider; preserve
the existing verification test separately if needed.
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.github/workflows/ci.ymlCargo.tomlREADME.mdrelease-plz.tomlsrc/auth/crypto.rssrc/auth/mod.rssrc/auth/tests.rssrc/auth/verifier.rssrc/lib.rs
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Installing it while the built-in verifier was being built left the dependency-graph case the additive features exist for: another crate that also uses jsonwebtoken can reach it first and hit the ambiguous fallback. - `install_default_crypto_provider` is public, so a process whose other crates may sign or verify before a server exists settles the choice from `main`. `ProxyServer::from_config` calls it too, so a plain deployment still needs nothing. - Split the tie-break into its own seam and assert it there: verifying a token proves only that some provider is installed, since both backends do EdDSA.
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A crate elsewhere in the graph can enable the other `jsonwebtoken` backend feature directly. Cargo then unifies both features on `jsonwebtoken` while this crate still compiles with one, so the build looks unambiguous from here and the provider was left uninstalled: the first sign or verify hit the panicking fallback. Name the provider explicitly in every configuration instead of only when both of this crate's features are on, and assert the selection per configuration.
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Summary
The Release-plz job on
mainfailed witherror: featuresrust_cryptoandaws_lc_rsare mutually exclusive, abortingcargo-semver-checksbefore it could pick the next version.Two things met:
cargo-semver-checksbuilds with its heuristic feature set (everything not namedunstable/nightly/bench/no_std/_*), which enables both backends at once, and release-plz 0.3.163 started surfacingcargo-semver-checksfailures instead of swallowing them. The job moved 0.3.161 → 0.3.169 with the last release, so a build error that had been ignored became a red workflow.The defect is ours: Cargo features must be additive. Mutually exclusive ones break feature unification,
--all-features, docs.rs andcargo-semver-checksalike.What changed
compile_error!is gone. With both backends linked,jsonwebtokencannot infer a provider, so the built-in verifier installsaws_lc_rsfor the process before it touches any key: constant-time, and free of RUSTSEC-2023-0071 thatrust_cryptocarries throughrsa. Thebuiltin_jwt-without-a-backend guard stays (unreachable through--all-features).all_features, so the combination is clippy'd, built and tested on every PR instead of surfacing at release time. The suite moved tocargo nextest run, with doctests kept oncargo test --doc.semver_check = falseinrelease-plz.toml: the check compiles the baseline from crates.io, and every published version up to 3.0.2 still carries the old guard, so it cannot pass until a release with this fix becomes the baseline. chore: re-enable the release-plz semver check once the baseline builds #84 tracks turning it back on.Cargo.tomlfeature comments and README updated to describe the tie-break instead of the old "do not build with--all-features".Testing
cargo nextest run --all-features→ 229 passed (includes the newverifies_with_both_crypto_backends_linked, which panics on the pre-fix tree with jsonwebtoken's "Could not automatically determine the process-level CryptoProvider").cargo nextest run --features redis→ 228 passed;--no-default-features --features aws_lc_rs,redis→ 228 passed;--no-default-features --features redis→ 209 passed.cargo clippy --all-targetswith-Dwarningson all four feature legs: clean.cargo fmt --check: clean.cargo doc --no-deps --all-features: builds, which is what failed in the release job.cargo semver-checks --baseline-version 3.0.2: still fails on the published baseline, which is why the check is off for one release cycle.Closes #83