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Let interaction-controls callers tell transient failures from rejections - #1245
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The interaction control helpers hid why a verification failed: fetch failures of a request's object or instrument looked like requests that lacked them, failed JSON-LD context loads looked like malformed documents, and errors from matchesApprovalCollection became denials. An inbox listener therefore could not tell whether to retry later or to reject the request for good, and Hollo, BotKit, and Hackers' Pub all had to work around the helpers. This commit includes the following changes: - verifyRequest() reports fetch failures of the object or instrument as notDereferenceable with the failed URL and the loader's error as cause, and failed context loads as notDereferenceable with the context URL. Loader errors are tracked per dereferencing operation so that recovered attempts and parse errors are not mistaken for fetch failures. - Unverifiable failures of verifyRequest() and verifyAuthorization() have a transient flag, computed by the new isTransientFetchError() in @fedify/vocab-runtime. - evaluatePolicy() keeps the collection callback's error as cause, and takes collectionErrors, fallbackRule, and precedence options. - verifyRequest() takes contextLoader and already resolved objects; quoteInteraction.verifyRequest() takes options for quote posts whose quote and quoteUrl disagree, that have several attributions, or that have no attribution. - verifyAuthorization() takes contextLoader, authorizationId, and allowOffOrigin options. - The id and to options of the Accept, Reject, and Delete constructors are optional, and createRevocation() can embed the authorization with only the IDs of its interacting object and target. All defaults keep the 2.4 behavior, except that fetch and context load failures are now reported as such. Preserving the sender's exact request representation when the helper dereferences it is out of scope; the manual suggests cloning the request before verification. Closes fedify-dev#1206 Assisted-by: Claude Code:claude-opus-5-5 Assisted-by: OpenCode:deepseek-flash Assisted-by: Codex:gpt-6-astra Assisted-by: Claude Code:claude-fable-5-1 Claude-Session: https://claude.ai/code/session_01MTz8EqRkcCsxbf9B7Wf95U
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Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe changes add transient fetch-error classification and expand interaction controls for request verification, policy evaluation, authorization checks, and activity creation. The manual, changelogs, and tests document and cover these changes. ChangesInteraction controls and fetch classification
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix · Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to This change adds transient-failure classification and opt-in options for interaction verification, policy evaluation, and activity creation. Default behavior matches the previous code, and no outstanding defects were identified, so it appears ready to merge. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to Strict validation remains the default, and fetch failures do not become approvals. The new opt-in behavior transfers provenance and authenticity checks to callers, so safe adoption depends on those checks and bounded retries. No introduced security bypass was established in the inspected paths. Retained concerns Security review detailsSecurity Blast Radius
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Review comments at @CHANGES.md:
- Around line 35-97: Remove the unreleased changelog entries from CHANGES.md;
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Review comments at @packages/interaction-controls/src/control.ts:
- Around line 874-881: Update the null-result handling in the loader wrapper so
constructing FetchError does not parse portable or unparseable URLs through new
URL(). Ensure a failure error is always created and recorded with the original
failed URL before it is thrown, allowing classifyFailure() to return
notDereferenceable.
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CHANGES.mdchanges.d/interaction-controls/verification-failures.mdchanges.d/vocab-runtime/transient-fetch-errors.mddocs/manual/interaction-controls.mdpackages/interaction-controls/src/control.test.tspackages/interaction-controls/src/control.tspackages/interaction-controls/src/like.test.tspackages/interaction-controls/src/quote.test.tspackages/interaction-controls/src/quote.tspackages/interaction-controls/src/types.tspackages/vocab-runtime/src/mod.tspackages/vocab-runtime/src/request.test.tspackages/vocab-runtime/src/request.ts
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When a document loader returned no document, the loader wrapper built a FetchError from the requested URL. FetchError's constructor parses the URL with new URL(), which throws for portable ap+ef61 URLs, so the error was never recorded and the failure was reported as invalidJsonLd instead of notDereferenceable. The wrapper now parses the URL with parseIri() and falls back to a plain Error, so the failure is always recorded. fedify-dev#1245 (comment) Changelog: none Assisted-by: Claude Code:claude-opus-5-5 Claude-Session: https://claude.ai/code/session_01MTz8EqRkcCsxbf9B7Wf95U
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Closes #1206.
The 2.4 helpers treated fetch timeouts as missing instruments, context load failures as malformed documents, and follower lookup failures as denials, so an inbox listener could not tell whether to retry or reject. Hollo, BotKit, and Hackers' Pub each wrapped the helpers to work around this (fedify-dev/hollo#644, fedify-dev/botkit#54, hackers-pub/hackerspub#429).
Telling fetch failures apart
The helpers now dereference with
suppressError: falseand wrap the document and context loaders for each dereferencing operation, recording what they throw. On failure, they walk the error's causes (cause,AggregateErrormembers, and jsonld.js'sdetails.cause) and reportnotDereferenceableonly if a cause is a recorded loader error. Cause matching keeps a gateway that failed before another one succeeded, or a parse error after a successful fetch, from passing as a fetch failure. Parsed objects keep the loaders they were given, so the wrappers stop recording once the operation ends.For an existing reference,
nullmeans the accessor rejected the document because of its origin or a failed portable object proof. That failure is reported as permanent.The
transientflag uses the newisTransientFetchError()from@fedify/vocab-runtime, so other packages can share the rules. It looks at the HTTP status,UrlError'sreason, and the cause chain. Unknown errors count as transient, since dropping a valid request is worse than retrying a bad one a bounded number of times.Compatibility options
All options are opt-in, and defaults keep the 2.4 behavior.
quoteInteraction, through a defaulted type parameter onInteractionControl, so they don't show up on the other helpers. Code typed withInteractionRequestVerificationOptions<QuoteRequest>still compiles.objectorinstrument.allowOffOrigintakes effect only together withverifyAuthenticity, andauthorizationIdchecks identity, not authenticity.embedAuthorizationcopies only IDs into the revocation, as FEP-044f requires, and is off by default because it changes the wire format.collectionErrors: "throw"rethrows the first callback error right away instead of trying later collections.Not addressed
verifyRequest()still caches dereferenced objects on the request, as other accessors do. Verifying a clone would leave the request untouched, butclone()drops the portable object verifier. The manual suggests cloning the request before verification when it has to be echoed back, so Hollo keeps a small preservation step.