[hahn-kev-bot]

---

AI summary

Exposes the MiniLcm routes on Lexbox under /api/lexicon, forwarded to FwHeadless, which serves them from its CRDT copy of the project (the headless harmony project). Lexbox owns auth and identity; FwHeadless stamps every write with the Lexbox user and the OAuth client, and keeps its copy in step with Lexbox through harmony syncs. Marked experimental in the public v1 OpenAPI document.

Lexbox

• New scopes lexiconread / lexiconwrite (LexboxAuthScope.LexiconRead/LexiconWrite). Read routes accept either, or the general lexboxapi scope; write routes accept lexiconwrite or lexboxapi. FW Lite's sendandreceive tokens are not accepted.
• GET /api/lexicon/projects: Harmony projects the caller is a member of that FwHeadless holds (id, code, name, role), filtered with one bulk readiness call to FwHeadless.
• /api/lexicon/project/{projectId}/...: the MiniLcm route table, forwarded with YARP (Proxies/LexiconProxy.cs). Read policy: can download the project (members, admins and org managers, like CRDT sync). Write policy: Editor Lite, Editor or Manager (same roles as media uploads). Unknown project ids pass auth so FwHeadless answers 404 rather than 403.
• The forward drops the caller's Authorization/Cookie, a jwt query parameter and any caller-supplied identity headers, then sets X-Lexbox-User-Id, X-Lexbox-User-Name (percent-encoded UTF-8) and X-Lexbox-Client-Id (the token's client_id claim, or lexbox for cookie/JWT sessions).
• The gridifyFilter parameter's OpenAPI description now documents the filter syntax and lists every filterable field, read from EntryFilter's mapper (MiniLcmWeb/GridifyFilterDocs.cs), on FwLiteWeb, FwHeadless and Lexbox.
• Every lexicon route has an OpenAPI summary and description of what it does (MiniLcmWeb/MiniLcmRouteDocs.cs, shared by all three hosts), followed by the experimental note; search is described too.
• role in the project listing is sent as the role name, and the public schema now describes ProjectRole as a string enum (this also corrects the existing FieldWorksLiteProject.role, which was documented as an integer but sent as a name).
• Every forwarded route declares its parameters and Produces<T>/Accepts<T>, so openapi/public.yaml carries the MiniLcm schemas. Internal MiniLcm properties (Order, some ids) are left out, and the web API also ignores them in request bodies (AddMiniLcmJsonOptions in MiniLcmWeb, shared by all three hosts). LexBoxApi now references MiniLcmWeb (for UpdateEntryRequest and the query options, now public).
• Seeds four native public OAuth clients copied from the FieldWorks Lite descriptor: lexicon-site-generator, lexicon-viewer, lexicon-mcp-server (read) and lexicon-lift-tool (read and write), loopback redirects http://localhost/oauth-callback and http://127.0.0.1/oauth-callback. The consent page describes the lexiconread and lexiconwrite scopes.

Scope matching (pre-existing)

• LexAuthUser.HasScope matched scope names as substrings, so a scope containing another's name passed its checks (e.g. a sendandreceiverefresh token passed sendandreceive checks, and an unrelated scope containing lexiconwrite would pass the write policy). It now matches whole space-delimited scopes. FieldWorks only uses its refresh token on getProjectToken, which requires the refresh scope itself.

FwHeadless

• Maps MiniLcmWeb under /api/lexicon/project/{projectId} with a resolver that opens the headless harmony project by id: 404 problem for an unknown project, 409 /problems/project-not-ready when there is no CRDT file or its first merge hasn't finished, 409 /problems/sync-in-progress for writes while a merge is queued or running. Writes go through the user-facing validation wrappers; validation errors return 400 and missing items 404. The ?projectId= middleware skips these routes.
• Write filter: 401 without the three identity headers; otherwise opens CommitMetadataInterceptor.Intercept setting AuthorId, AuthorName and ExtraMetadata["OAuthClientId"], then schedules a harmony sync.
• POST /api/lexicon/projects/ready (body: project ids) returns the ids that are ready, as above.
• HarmonySyncScheduler (new hosted service): 5 s trailing debounce per project, then CrdtSyncService.SyncHarmonyProject in a fresh scope (not SyncWorker or the sync-harmony route); exponential backoff capped at 5 min on failure; pending syncs dropped while a merge is queued or running, and a project that dropped one is synced again on the first scan (each minute) after the merge; every project synced once per 24 h at a random offset; no sync on startup or reconnect. Like the merge, it skips projects that are blocked from syncing or whose first merge hasn't finished, and requests that waited out a running sync trigger one more sync, not one each.
• LexboxProjectChangeListener: SignalR client on /api/hub/crdt/project-changes, authenticated by the existing service-account cookie handler, subscribed to every headless harmony project on disk (rescanned each minute, so projects the merge creates later are picked up), resubscribed after reconnect. It clears the cached Lexbox health verdict on connect and reconnect, so a brief outage doesn't block syncs and merges for 30 minutes. Notifications carrying the project's own client id are ignored. Uses SSE/long polling because only those transports go through the cookie-adding handler pipeline. A cross-reference comment links it to FW Lite's LexboxHubConnection.

Authorship

• LcmCrdtConfig.DefaultAuthorForCommits is replaced by RequireCommitAuthor (FwHeadless sets it): HarmonyChangeWriter refuses a commit with neither author name nor id. FW Lite is unaffected (off by default, as local projects have no author).
• SyncWorker.ExecuteSync stamps AuthorName = CommitHelpers.FieldWorksAuthorName ("FieldWorks") explicitly; SnapshotAtCommitService uses the same constant and the viewer mirrors it. No other merge code changed.

Known gaps

• FwHeadless trusts the X-Lexbox-* headers and has no auth on /api/lexicon (same trust as /api/media): it must stay reachable only from Lexbox.
• Commits pushed to Lexbox while the listener is disconnected (or FwHeadless is restarting) wait for the daily sweep, since there is no sync on reconnect yet.
• A merge doesn't wait for a harmony sync or a lexicon write already in flight. One landing between the merge's CRDT sync and its snapshot regeneration could be read as a FieldWorks deletion by the next merge. The merge spends its first seconds to minutes on send/receive before it reads the CRDT, so the overlap is unlikely; closing it needs a per-project gate that merges take exclusively, which touches merge code.
• PUT /entry/{id} isn't atomic: each change is its own commit, so a failure halfway keeps the earlier ones (Updating an entry through the web API isn't atomic #2867).

Test plan

• dotnet build FwHeadless, LexBoxApi, FwLiteWeb, Testing: 0 errors
• task check-generated (public OpenAPI and GraphQL schema regenerated)
• LcmCrdt.Tests: OpenProjectTests (new RequireCommitAuthorRefusesCommitsWithNoAuthor), HistoryServiceActivityTests, SnapshotAtCommitServiceTests: 40 passed
• Review pass on the FwHeadless/LcmCrdt changes (no path writes a commit without an author; fixed: re-sync after a merge drops one, no sync after a refused write)
• Testing: HarmonySyncSchedulerTests, ProjectFolderTests, GridifyFilterDocsTests, SyncWorkerTests, LexAuthUserTests and other auth/scope unit tests
• MiniLcm.Tests: SerializationTests (new ApiModifiersIgnoreInternalPropertiesInRequestBodies)
• Local stack, curl through Lexbox: list projects, read entries, create/update/delete an entry
• The write shows up in Lexbox's CRDT commits within seconds, with the user as author and OAuthClientId in its metadata
• A commit pushed to Lexbox by FW Lite reaches the headless harmony project without a merge
• A write while a merge is queued or running gets 409 sync-in-progress
• OAuth token from one of the seeded clients: confirm the client_id claim reaches the X-Lexbox-Client-Id header (else it falls back to lexbox)

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Walkthrough

This change adds Lexicon routes to FwHeadless and LexBox, with project readiness checks, access policies, and request forwarding. It adds a Harmony sync scheduler and a SignalR listener for Lexbox project changes. It also adds a setting that rejects commits without author metadata and stamps sync commits with the FieldWorks author. The OpenAPI document and OAuth scopes now include Lexicon operations.

Priority: Normal

Estimated code review effort: 4 (Complex) | ~60 minutes

Change: Feature

Possibly related issues

• sillsdev/languageforge-lexbox#2842 describes a follow-on idea that depends on the Lexicon API and refers to the write path added here. The issue summary states that the idea is not part of this effort.

Suggested reviewers: hahn-kev, myieye, rmunn

Merge Risk: Low · previous review 9fb25

Existing project-list responses no longer match their published schema, which may mislead API consumers. Correct the shared schema or separate the lexicon role schema before merging.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 26.92% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documenta…	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Title check		The title clearly and concisely describes the main change: serving the Lexicon API on Lexbox through FwHeadless.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Description check		The pull request description directly describes the Lexicon API, Lexbox forwarding, FwHeadless routes, authorization, synchronization, authorship, seeded clients, tests, and known gaps covered by the …

Full details: Description check

Explanation

The pull request description directly describes the Lexicon API, Lexbox forwarding, FwHeadless routes, authorization, synchronization, authorship, seeded clients, tests, and known gaps covered by the changeset.

Full details: Docstring Coverage

Explanation

Docstring coverage is 26.92% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 26 functions across 25 files. (5 skipped: 5 unsupported.)

Resolution

Write docstrings for the functions missing them to satisfy the coverage threshold.

Finishing Touches: 💡 1

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Actionable comments posted: 1

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @backend/LexBoxApi/openapi/public.yaml:
- Line 2022: Update the LexiconProject.Role serialization to emit ProjectRole
values as strings using the same property-level converter as
FieldWorksLiteProject.Role, and restore the shared ProjectRole schema in
public.yaml to its original string-enum definition so the existing endpoints
retain their documented wire format.

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Commits

Reviewing files that changed from the base of the PR and between 9f41479 and 9fb2515.

Files selected for processing: 30

• backend/FwHeadless/FwHeadless.csproj
• backend/FwHeadless/FwHeadlessConfig.cs
• backend/FwHeadless/FwHeadlessKernel.cs
• backend/FwHeadless/Program.cs
• backend/FwHeadless/Routes/LexiconRoutes.cs
• backend/FwHeadless/Services/HarmonySyncScheduler.cs
• backend/FwHeadless/Services/IProjectLookupService.cs
• backend/FwHeadless/Services/LexboxProjectChangeListener.cs
• backend/FwHeadless/Services/ProjectContextFromIdService.cs
• backend/FwHeadless/Services/ProjectLookupService.cs
• backend/FwHeadless/Services/SyncHostedService.cs
• backend/FwHeadless/appsettings.json
• backend/FwLite/FwLiteShared/Projects/LexboxHubConnection.cs
• backend/FwLite/LcmCrdt.Tests/OpenProjectTests.cs
• backend/FwLite/LcmCrdt/Harmony/HarmonyChangeWriter.cs
• backend/FwLite/LcmCrdt/LcmCrdtConfig.cs
• backend/FwLite/MiniLcmWeb/MiniLcmQueryOptions.cs
• backend/LexBoxApi/Auth/AuthKernel.cs
• backend/LexBoxApi/Auth/Requirements/LexiconProjectRequirementHandler.cs
• backend/LexBoxApi/LexBoxApi.csproj
• backend/LexBoxApi/LexBoxKernel.cs
• backend/LexBoxApi/Program.cs
• backend/LexBoxApi/Proxies/LexiconProxy.cs
• backend/LexBoxApi/Services/FwHeadlessClient.cs
• backend/LexBoxApi/openapi/public.yaml
• backend/LexCore/Auth/LexboxAuthScope.cs
• backend/LexData/SeedingData.cs
• backend/Testing/FwHeadless/HarmonySyncSchedulerTests.cs
• backend/Testing/FwHeadless/ProjectFolderTests.cs
• frontend/schema.graphql

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