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external-datasource-federated-read: external-write refusal (ExternalWriteForbiddenError) leaks to the client as a bare 500 INTERNAL_ERROR #7739
Description
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🔒 Claimed by the
domain:cliPM seat (seat post #6024), round 7.- Session:
session_0158ZQo7LiHSxGWpYKuPq1wu - Branch:
claude/issue-7739-external-write-forbidden-envelope
Dispatching to a developer agent now. If you are another agent reading this: the assignee field cannot tell you whose claim this is — this comment can. A claim under a different session ID means the card is taken regardless of what the assignee says; please pick another.
Scope as dispatched: map
ExternalWriteForbiddenError(EXTERNAL_ERROR_CODES.writeForbidden, defined inpackages/spec/src/shared/external-errors.ts, thrown inpackages/objectql/src/engine.ts) to a 4xx envelope carrying its stablecodeand the refusal detail the error already computes, instead of letting it fall through the generic handler inpackages/rest/src/rest-server.tsto a bare 500 INTERNAL_ERROR.Two notes for the developer agent:
- Map the family, not the instance. The filing shows there is no mapping for
EXTERNAL_ERROR_CODESat all inrest/runtime/cli. Wiring onlywriteForbiddenleaves every sibling external error in the same 500-leak state and guarantees the next QA run refiles this card under a different code. Map the code family through one place, then pinwriteForbiddenwith the regression test. rest-server.tsis a known hot file — [finding] ADR-0076 D11 的第二半从未落地:packages/rest/src/rest-server.ts已 8593 行(ADR 记录约 5.1k),且无 issue 承接 #5949 records it at 8593 lines and it is a frequent merge-conflict site. Keep the diff tight and rebase before pushing rather than carrying a stale branch.
The 4xx status choice (403 vs 409 vs 422) is the developer agent's call from the surrounding error-map conventions, but it must be stated in the PR body with the convention it followed — a refusal that is policy, not malformed input, should not be reported as a client-syntax error.
Generated by Claude Code
- Session:
{ "issue": 7739, "status": "done", "branch": "claude/issue-7739-external-write-forbidden-envelope", "pr": "https://github.com/objectstack-ai/objectstack/pull/7791", "pr_url": "https://github.com/objectstack-ai/objectstack/pull/7791", "premise_still_valid": true, "summary": "Premise confirmed on origin/main: no rest/runtime/cli mapping for EXTERNAL_ERROR_CODES existed, and a Gate-3 write refusal left /api/v1/data as 500 INTERNAL_ERROR with no code via mapDataError's terminal UNCLASSIFIED_FAULT. The missing half was never the code — EXTERNAL_WRITE_FORBIDDEN is already registered in the ADR-0112 error-code ledger — it was an HTTP status, which no exit can invent. Fixed at the PRODUCER: packages/spec/src/shared/external-errors.ts gains EXTERNAL_ERROR_HTTP_STATUS, one table covering the whole family, and each of the three error classes carries its value as `status`. Every HTTP exit in the repo already resolves status then statusCode (declaredHttpStatus, resolveErrorResponse, HttpDispatcher.errorFromThrown, dispatcher-plugin.errorResponseBase, endpoint-executor, domains/actions, plugin-hono-server), so one table fixes every door at once; rest-server.ts (the 8593-line conflict site named in #5949) is untouched by zero lines. `satisfies Record<ExternalErrorCode, number>` makes a future gate that adds a code without a status a compile error, which is the half that stops this card being refiled under a different code.", "files_changed": [ "packages/spec/src/shared/external-errors.ts (+69) — EXTERNAL_ERROR_HTTP_STATUS table + `status` on all three error classes", "packages/spec/src/shared/external-errors.test.ts (+58) — family pin: map covers exactly EXTERNAL_ERROR_CODES, every status in the 400-599 band, each instance carries it", "packages/rest/src/external-write-forbidden-envelope.test.ts (+358, new) — regression test on the real CRUD routes", "packages/spec/api-surface/shared.json (+1) — regenerated", "packages/spec/export-origins/shared.json (+1) — regenerated", ".changeset/external-error-http-status.md (+46, new) — @objectstack/spec patch" ], "tests_added": "9 cases in packages/rest/src/external-write-forbidden-envelope.test.ts + 5 cases in packages/spec/src/shared/external-errors.test.ts. The REST file drives the real POST/PATCH/DELETE /api/v1/data routes in process against a protocol whose data verbs are a REAL ObjectQL engine over an in-memory driver whose store the test can read — deliberately not a rejecting mock, because a mock makes 'nothing is applied' vacuously true and would stay green against a future fix that got the status right by letting the write through. §1 asserts 403 + code + the refusal detail (datasource, schemaMode, both flags) + object + no 'Unhandled error' log; §2 the same pair for PATCH and DELETE; §3 asserts the store is byte-identical AND the driver was never reached at all (so a create-then-rollback 'fix' fails even with an empty table), plus a CONTROL case that flips both opt-in flags and writes through the very same route to prove the fixture is not inert.", "status_choice": "403 for EXTERNAL_WRITE_FORBIDDEN. Convention followed: mapDataError's existing capability-gate family — FEEDS_DISABLED, FILES_DISABLED, CLONE_DISABLED, RECORD_NOT_ACCESSIBLE all answer 403 for 'a flag switched this capability off for the object', and the standard catalog spells the same condition FORBIDDEN. Rejected 400/422 because nothing about the payload is malformed: the identical body succeeds the moment datasource.external.allowWrites and object.external.writable are both on, so a client-syntax status would be a lie about a policy refusal. Rejected 409 because it promises a state the caller can reconcile and retry, and there is none. 403 also keeps the message on the wire (the 4xx arm truncates rather than replaces), which matters here because the prose names exactly which two flags to set.", "family_mapping": { "one_dispatch": "The dispatch is the status declaration itself, read by the status/statusCode resolution every HTTP exit already performs — not a new branch. EXTERNAL_ERROR_HTTP_STATUS is the single table; only the values differ per code.", "EXTERNAL_WRITE_FORBIDDEN": "403 — policy refusal (write gate, ADR-0015 Gate 3)", "EXTERNAL_SCHEMA_MODE_VIOLATION": "403 — same sentence for DDL: schemaMode !== 'managed' forbids it and no rewritten request changes that (DDL gate, thrown in driver-sql/src/sql-driver.ts:3308)", "EXTERNAL_SCHEMA_MISMATCH": "503 — deliberately NOT 4xx. Nothing about the request is wrong; the deployment's metadata and the remote table diverged, only an operator can reconcile them, and it may clear. Same reading ERR_DATASOURCE_UNAVAILABLE already gets; both are isExpectedDataStatus lifecycle outcomes. The 5xx band withholds the prose by design, which is right here — this gate aborts boot (runtime/src/external-validation-plugin.ts:125) so its structured diffs audience is already operator-side, and the client still gets a code instead of a bare 500." }, "checks": { "spec_full_suite": "pnpm --filter @objectstack/spec test → 'Test Files 378 passed (378) / Tests 9953 passed (9953)' — Duration 344.38s", "rest_full_suite": "pnpm --filter @objectstack/rest test → 'Test Files 92 passed (92) / Tests 1471 passed (1471)'", "rest_regression_file": "pnpm --filter @objectstack/rest test external-write-forbidden-envelope → 'Test Files 1 passed (1) / Tests 9 passed (9)' — Duration 9.62s", "objectql": "pnpm --filter @objectstack/objectql test external-write-gate → 'Test Files 1 passed (1) / Tests 11 passed (11)'", "runtime": "pnpm --filter @objectstack/runtime test external-validation → 'Test Files 1 passed (1) / Tests 13 passed (13)'", "rest_envelope_neighbours": "pnpm --filter @objectstack/rest test rest-hook-refusal-status-passthrough rest-5xx-message-sanitization rest-5xx-status-passthrough rest-unclassified-fault-status external-datasource-envelope → 'Test Files 5 passed (5) / Tests 100 passed (100)'", "typecheck_spec": "pnpm --filter @objectstack/spec typecheck → clean; 'check:test-typecheck: OK — @objectstack/spec's test layer compiles under packages/spec/tsconfig.test.json; 57 file(s) / 265 error(s) held in test-typecheck-debt.json (shrink-only)' — pre-existing debt, unchanged by this PR", "typecheck_rest": "pnpm --filter @objectstack/rest typecheck → 'tsc --noEmit' with no output, exit 0", "eslint": "npx eslint on the three changed/added files → no output, exit 0", "check_api_surface": "'@objectstack/spec public API surface + factory signatures unchanged ✓' (after gen:api-surface — one new export recorded)", "check_export_origins": "'✅ export-origins/ is current: 5013 exports across 16 entry points resolve exactly as recorded.'", "check_error_code_casing": "'✓ no lowercase error codes in 3646 scanned file(s) (ADR-0112).' (self-test 17 cases pass)", "check_nul_bytes": "'check-nul-bytes: OK (scanned 7131 text file(s) -- 7131 tracked, 0 untracked-not-ignored; skipped 5 binary; no raw ASCII control bytes).'", "reverse_verification": "Direction predicted BEFORE running: RED. Reverted external-errors.ts to origin/main, REBUILT @objectstack/spec (the test imports dist — reverting source alone would have proven nothing), re-ran: 'Tests 7 failed | 2 passed (9)' with 'AssertionError: expected 500 to be 403 // Object.is equality' and res.body.code undefined. The §1 'not logged as an unhandled fault' case also went red ('expected true to be false'), i.e. the 500 really did emit '[REST] Unhandled error'. The 2 survivors are direction-insensitive BY CONSTRUCTION and are recorded as measured rather than reshaped: §3's 'PATCH and DELETE reach the driver no more than POST does' (nothing was ever applied — the behaviour was never the bug) and §3's write-allowed CONTROL case (untouched by this change). Fix restored, spec rebuilt, 9/9 green again.", "ci": "in_progress — reported at draft-PR time per #6644 L2; PM owns the CI-convergence read." }, "tests": "See `checks` above. Headline: spec 378 files / 9953 tests passed; rest 92 files / 1471 tests passed; new regression file 9/9; reverse verification measured 7 failed | 2 passed (9) on the unfixed producer with 'expected 500 to be 403'.", "scope_deviations": "None. rest-server.ts not touched (zero lines) as the card asked. #7663 / #7543 / #5437 deliberately not touched — and, answering the card's question directly, this mapping does NOT make any of them easier to close: each has a different cause (a producer that writes no body; a native error name reaching a business-refusal branch; a 5xx passthrough range), and none of them is a missing status declaration. One process note, not a code deviation: mid-task I ran `git checkout <branch> -- <path>` to restore the fix after reverse verification while the work was still UNCOMMITTED, which silently restored origin/main's version instead and destroyed the edit. Re-applied from context, verified byte-identical (same 69-insertion diffstat), and committed immediately. No other file was affected and nothing of another agent's was touched.", "blockers": [], "open_questions": [], "out_of_scope_findings": [] }
Generated by Claude Code
- added a commit that references this issue
on Oct 7, 2026
Symptom
A write to a read-only federated external object is correctly refused server-side —
ExternalWriteForbiddenErrornames the datasource, itsschemaMode, and both flags that would be required — but it reaches the client as a bare 500 INTERNAL_ERROR, indistinguishable from a crash. Nothing is applied (the remote table is byte-identical after the attempt). Same envelope-leak class as the auth bodyless-500s in #7663 and the earlier raw-TypeErrorleak in #7543 (and the 5xx driver-throw passthrough family #5437).Root cause
ExternalWriteForbiddenError(defined inpackages/spec/src/shared/external-errors.ts, thrown inpackages/objectql/src/engine.ts) carries a stablecode(EXTERNAL_ERROR_CODES.writeForbidden), but no REST/runtime error map references it: agit grepforwriteForbidden/ExternalWriteForbidden/EXTERNAL_ERROR_CODESacrosspackages/rest,packages/runtime, andpackages/clifinds no mapping. So the error falls through the generic handler inpackages/rest/src/rest-server.tsto 500 INTERNAL_ERROR instead of a 4xx envelope that carries thecodeand the refusal detail the error already computed.Stale-premise check: present on
origin/main(no external-error mapping exists in the rest/runtime layer).Reproduction
schemaModethat forbids writes).POST /api/v1/data/<external_object>with any body.Expected: a 4xx envelope with a stable
codenaming the write-forbidden refusal. Actual: 500 INTERNAL_ERROR with nocode, indistinguishable from a crash, even though the server-sideExternalWriteForbiddenErrorwas correct and nothing was applied.Source
Extracted from the QA run #7690 (framework 92f26f7, console 09987b680).