Andrew Altshuler 9973683261 policy: chassis core — omnigraph-policy crate + Omnigraph::enforce() (MR-722) (#102) ... PR #2 of the policy chassis series (PR #1 = MR-731, merged in #101). The structural fix that moves Cedar enforcement from HTTP-only to engine-wide. apply_schema is the proof-of-concept writer; PR #3 fans the enforce() call out to the remaining six (mutate_as, load, ingest_as, branch_create_from, branch_delete, branch_merge). ## What lands ### New crate: omnigraph-policy The 844-line policy.rs moves from `omnigraph-server` into a new `omnigraph-policy` workspace crate so both engine and server can depend on it. Cedar dependency moves with it. The server's policy.rs becomes a re-export shim (`pub use omnigraph_policy::*`) so existing `omnigraph_server::PolicyAction` etc. paths keep working — CLI and test consumers don't have to migrate in one go. ### New trait: PolicyChecker ```rust pub trait PolicyChecker: Send + Sync { fn check(&self, action: PolicyAction, scope: &ResourceScope, actor: &str) -> Result<(), PolicyError>; } ``` `PolicyEngine` (Cedar-backed) implements it. `Omnigraph::with_policy()` takes `Arc<dyn PolicyChecker>`. Engine tests mock the trait without spinning up Cedar. MR-725 will extend the trait with `predicate_for()` for query-layer pushdown — additive, no call-site changes. ### New enum: ResourceScope Four variants — Graph, Branch, TargetBranch, BranchTransition — mapping cleanly to today's `(branch, target_branch)` shape on PolicyRequest via `to_branch_pair()`. Each engine writer picks the variant that matches the existing HTTP-layer convention so engine and HTTP evaluate the same Cedar decision. **Invariant**: ResourceScope stays at branch granularity. Per-type and per-row scope are MR-725's territory, not engine-layer's. Adding Type/Row variants here creates two places per-type policy can be evaluated, which can drift. See chassis design refinements comment on MR-722 (2026-05-17). ### Omnigraph::with_policy() + enforce() * New `policy: Option<Arc<dyn PolicyChecker>>` field on Omnigraph, None by default (preserves embedded/dev no-enforcement mode). * `with_policy(self, checker)` setter — builder-style, consumes self. * `enforce(action, scope, actor)` — the gate. When policy is None, no-op. When policy is Some AND actor is None, hard error — silent bypass via "I forgot the actor" is exactly the footgun this gate is here to prevent. ### apply_schema_as: first writer wired * New public method `apply_schema_as(source, options, actor)` that calls `enforce(SchemaApply, TargetBranch("main"), actor)` before acquiring the schema-apply lock or doing any other work. * Existing `apply_schema(source)` and `apply_schema_with_options(...)` delegate to it with actor=None (no-actor variants). * HTTP handler `server_schema_apply` updated to call apply_schema_as with the resolved actor. AppState construction injects the PolicyEngine into Omnigraph via `with_policy`. HTTP-layer authorize_request still fires first; the engine gate is the redundant-but-correct backstop and the only path that protects SDK / embedded callers. PR #3 removes the HTTP redundancy. ### OmniError::Policy New error variant for engine-layer policy denial / evaluation failure. ApiError::from_omni maps it to 403. ### MR-724 Admin action — Option A reservation PolicyAction::Admin kept in the enum with a load-bearing doc comment naming its future consumers (hot reload, audit log query, approvals list per MR-726 / MR-732 / MR-734). No enforce(Admin, ...) call site exists yet — the variant is reserved so the action vocabulary is complete from chassis day one. MR-724 closes when the first consumer surface ships. ### New SDK-side integration test `crates/omnigraph/tests/policy_engine_chassis.rs` — four tests covering: * Policy denies for unauthorized actor → OmniError::Policy * Policy permits for authorized actor → apply succeeds * Policy installed + no actor → hard error (forget-the-actor footgun) * No policy → no-op (embedded/dev default still works) These exercise the engine path directly — no HTTP layer involved. ## Test results - cargo test --workspace --locked --no-fail-fast: 851 passed, 0 failed * 45 server tests (existing) pass * 14 schema_apply tests (existing) pass * 4 new chassis tests pass * 60 OpenAPI tests pass (no HTTP API surface changes) * No regressions across the workspace ## Architectural decisions baked in Per MR-722 chassis design refinements comment (2026-05-17): 1. PolicyChecker is a trait, not just a concrete. Engine and server consume the trait. MR-725 adds predicate_for() additively. 2. ResourceScope stays at branch granularity. No Type/Row variants. 3. Coarse-vs-fine framing pinned: engine-layer is action gate; query-layer (MR-725) is predicate gate. Both backed by same Cedar engine; non-overlapping responsibilities. 4. Admin action reserved for policy-management surfaces (MR-724 Option A). ## Pending follow-ups (PR #3+) - Fan-out enforce() to mutate_as, load, ingest_as, branch_create_from, branch_delete, branch_merge (PR #3). - Remove HTTP-layer authorize_request redundancy once engine gate covers all writers (PR #3). - CLI policy injection into Omnigraph for non-`policy validate|test|explain` subcommands (PR #3 or follow-up). - MR-723 default-deny 3-state matrix (PR #4). - MR-736 severity warn/deny (PR #5). - AGENTS.md scope-of-enforcement rewrite once chassis fully lands. - Coarse-vs-fine framing in docs/user/policy.md. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>		2026-05-18 00:36:36 +03:00
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src	policy: chassis core — omnigraph-policy crate + Omnigraph::enforce() (MR-722) (#102)	2026-05-18 00:36:36 +03:00
Cargo.toml	policy: chassis core — omnigraph-policy crate + Omnigraph::enforce() (MR-722) (#102)	2026-05-18 00:36:36 +03:00