feat(provider): implement generic REST permission provider - #13
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Included review availability: Your plan provides up to 10 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughThis PR adds and registers an HTTPS Generic REST Permission Provider. It defines configuration and error types, validates wire data, performs bounded DNS and HTTPS operations, and adds hermetic behavioral tests. ChangesGeneric REST Permission Provider
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant Caller
participant GenericRestPermissionProvider
participant DNS
participant RemoteProvider
Caller->>GenericRestPermissionProvider: resolve(request)
GenericRestPermissionProvider->>DNS: resolve one A and one AAAA query
DNS-->>GenericRestPermissionProvider: return selected address
GenericRestPermissionProvider->>RemoteProvider: establish TLS and send JSON POST
RemoteProvider-->>GenericRestPermissionProvider: return bounded desired-state response
GenericRestPermissionProvider-->>Caller: return envelope or mapped error
Suggested reviewers: Merge Risk: ⚪ Minimal · up to The updated tests contain no actionable merge-blocking risk. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@crates/permissionsync-provider-generic-rest/src/client.rs`:
- Around line 838-855: The UDP-backed tests
hostname_resolution_starts_both_queries_and_deterministically_prefers_ipv4 and
dropping_dns_resolution_cancels_both_operation_owned_queries should use
real-time #[tokio::test] execution instead of start_paused; leave
dns_timeout_has_no_retransmit_or_residual_worker_datagram with start_paused
unchanged.
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Cargo.tomlREADME.mdcrates/permissionsync-provider-generic-rest/Cargo.tomlcrates/permissionsync-provider-generic-rest/src/client.rscrates/permissionsync-provider-generic-rest/src/error.rscrates/permissionsync-provider-generic-rest/src/lib.rscrates/permissionsync-provider-generic-rest/src/wire.rscrates/permissionsync-provider-generic-rest/tests/generic_rest_provider.rs
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Inline comments:
In `@crates/permissionsync-provider-generic-rest/src/client.rs`:
- Line 443: Update DNS resolution aggregation in resolve_record and
resolve_one_address to preserve Hickory timeout errors instead of collapsing
them through .ok()?. Map only genuine timeout exhaustion to
ProviderFailure::DeadlineExceeded, while mapping other DNS failures to
ProviderFailure::Transport; do not infer the category solely from a post-await
Instant::now() check.
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crates/permissionsync-provider-generic-rest/src/client.rs
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Inline comments:
In `@crates/permissionsync-provider-generic-rest/tests/generic_rest_provider.rs`:
- Line 1185: Update oversized_chunked_response to tolerate client disconnects by
ignoring the expected error from stream.write_all(&response) instead of
panicking with expect. Preserve normal response writing while allowing
BrokenPipe or ConnectionReset when the client stops reading, so server.await
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crates/permissionsync-provider-generic-rest/src/client.rscrates/permissionsync-provider-generic-rest/src/lib.rscrates/permissionsync-provider-generic-rest/tests/generic_rest_provider.rs
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Code Review ✅ ApprovedImplements a generic REST permission provider backed by HTTPS transport with bearer credential forwarding, strict response validation, operation-owned DNS and HTTP connections, and a 1 MiB response-body ceiling. No issues found. Review coverageRules No rules evaluated OptionsAuto-apply is off → Gitar will not commit updates to this branch. Comment with these commands to change the behavior for this request:
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Goal
Implement the v1 Generic REST Permission Provider as a concrete
PermissionProviderbacked by the HTTPS transport contract defined in ADR 0008.Related ADRs
ADR 0002, ADR 0003, ADR 0004, ADR 0005, ADR 0006, ADR 0007, ADR 0008.
Scope
PermissionProviderimplementation.username/groupsrequest contract.Out of scope
Inbound HTTP, PermissionSync JWT authentication and validation, OAuth scope processing, synchronization orchestration, target routing changes, Target Adapter implementations, runtime configuration loading, application composition, observability integration, and OCI/runtime packaging.
Implementation
The new
permissionsync-provider-generic-restcrate implements the existing CorePermissionProviderport.Its public construction API consists of:
Each
additional_trust_anchors_pementry is a PEM certificate bundle and may contain one or more concatenated X.509 certificates. Configured certificates are added to, rather than replacing, the platform trust roots.The Provider sends one HTTP/1.1 POST to the configured complete HTTPS endpoint with:
and the exact request body:
{ "username": "jdoe", "groups": ["/staff", "/staff/engineering"] }The technical-caller credential is forwarded unchanged. The client does not parse or validate the JWT and does not derive target semantics from it; the remote Provider remains responsible for independent resource-server validation and target derivation.
LogicalTargetremains part of the internal Core Provider request but is not serialized onto the REST wire.Transport
Provider operations use low-level Hyper HTTP/1.1 connections rather than a pooled high-level client.
DNS resolution, TCP connection, TLS negotiation, HTTP handshake, request delivery, response processing, and the Hyper connection driver are all owned by the same bounded Provider future.
Hostname resolution uses the platform DNS configuration and operation-owned Hickory UDP requests. One A and one AAAA query form a single logical resolution, without retransmission or nameserver failover. At most one resulting socket address is selected for the TCP connection.
A usable address from either family succeeds. If neither family produces a usable address, a genuine DNS timeout is classified as deadline exhaustion; other DNS failures remain transport failures.
IP-literal endpoints bypass DNS entirely.
There is no:
Response contract
Only a final:
is accepted as successful Provider resolution.
Every other status, including other successful HTTP statuses such as
204, is a Provider failure.Successful responses must use
application/jsonwith UTF-8-compatible charset semantics and an unencoded representation.The response body is bounded by an absolute product-owned ceiling of:
Content-Lengthis checked before buffering when available, and streamed body bytes are independently counted so an absent or inaccurate declaration cannot bypass the limit.The ceiling is intentionally conservative: desired-state documents are expected to be materially smaller while the limit bounds per-request buffering, parser work, memory amplification, and the impact of defective or malicious Provider responses.
The successful JSON envelope is strictly:
{ "version": <u64>, "payload": <any valid JSON value> }Unknown or duplicate members, invalid versions, malformed JSON, trailing JSON, invalid UTF-8, invalid media types, content codings, and oversized bodies fail Provider resolution.
The payload remains opaque to the Provider client and is passed to Core without application-specific interpretation.
Dependencies
None.
Review guide
Focus on:
LogicalTargetfrom the wire contract;Architecture invariants
The synchronized end user and technical caller remain distinct identities.
The remote Permission Provider independently validates the forwarded JWT as its own resource server and derives its target from that credential.
PermissionSync retains its independently selected
LogicalTargetfor internal routing and orchestration.The Generic REST Provider does not introduce a universal permission model:
payloadremains adapter-specific opaque desired state.Core remains transport- and runtime-neutral.
Tests
The implementation includes deterministic, hermetic coverage for:
200-only success semantics including explicit remote204rejection;u64version boundaries;All transport tests use local ephemeral endpoints and deterministic in-memory test TLS material.
Security considerations
The Authorization header is marked sensitive before entering Hyper.
Bearer credentials, synchronized identities, Provider payloads, complete endpoint details, response bodies, PEM trust material, and downstream diagnostics are not retained in Provider error sources.
TLS certificate and hostname verification cannot be disabled through the public Provider API.
System trust roots remain enabled and deployments may add private CA roots through PEM certificate bundles without replacing them.
Provider response bodies are bounded before full buffering.
No Provider request is retried or replayed after a transport failure.
Follow-ups
Later work will connect the Provider to synchronization orchestration and resolved runtime configuration, followed by inbound authentication/HTTP handling and concrete Target Adapter integration.