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Labyricorn
ed76cf6189
- Implemented §31.4 same-origin resolution during discovery - Validated genericity scan correctly via full recursive check - Generated browser screenshots for 5.2/5.3 verification
308 lines
14 KiB
Markdown
308 lines
14 KiB
Markdown
# XZBT-NGN Step 6.3 — Generic Surface Discovery Verification
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**Date:** 2026-09-14
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**Phase:** 6.3 — Contract 5.3 Surface Discovery (first NGN product code change for multi-surface)
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**Repository branch:** main
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**Pre-6.3 baseline commit:** 44f2ad3 (Step 6.2 Complete)
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---
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## A. Purpose
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Phase 6.3 adds **generic Contract 5.3 surface discovery** to XZBT-NGN. At the end of 6.3 NGN can:
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1. negotiate with Contract 5.2 exhibits exactly as before
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2. negotiate with Contract 5.3 exhibits
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3. discover an optional `surfaces` catalog from `describe.result`
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4. validate that catalog according to Contract 5.3 §§31.2–31.5
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5. store the validated surface descriptors in host state
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6. display discovered surfaces generically in the NGN admin UI
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7. react correctly when `registry.changed` changes the surface catalog
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8. preserve all existing target/state/capability behavior
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9. NOT open secondary surface windows (that is Phase 6.4)
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---
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## B. Contract 5.3 Negotiation Approach
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**`xzbt` advisory field:** NGN now emits `xzbt: "5.3"` on all outgoing messages (hello and subsequent requests). Contract §6.5 states this field is advisory metadata for diagnostics; the negotiated session contract major/minor is authoritative after handshake. Both 5.2 and 5.3 exhibits must tolerate any advisory `xzbt` value.
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**`supportedContractMajors`:** Unchanged — `[5]` covers both 5.2 and 5.3.
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**Handshake acceptance:** The existing check `major === 5 && counter(minor)` already accepted both minor 2 and 3 without modification. No additional negotiation mechanism was needed.
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**`contractMinor` tracking:** After `hello.result`, NGN stores `this.contractMinor = hello.contract.minor`. This provides the operator-visible negotiated minor version for display (shown in the identity line as "Contract 5.X") without creating a new negotiation step.
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---
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## C. Backward Compatibility with 5.2
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Contract 5.2 exhibits:
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- Continue to receive `xzbt: "5.3"` advisory (tolerated per §6.5; advisory only)
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- Report `contract.minor: 2` in `hello.result` — NGN records this as `contractMinor = 2`
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- Do not emit `surfaces` in `describe.result` — `validateSurfaceCatalog` returns `[]` for absent/undefined fields, no diagnostic emitted
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- All existing targets, state, events, capabilities, set/invoke, reconnect, and registry behavior unchanged
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Exhibits tested: Aquarium, Planetarium, Haunted House (automated); Aquarium (browser verification). Zero regressions observed.
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---
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## D. Surface Validation Implementation
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**Location:** `src/validation.js` — `validateSurfaceCatalog(message, logFn)`
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**Normative validation order (Contract 5.3 §31.3):**
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1. If `message.surfaces` is absent or `[]` → return `[]` immediately (absent-equivalent; forms 1/2 treated identically)
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2. Validate each entry independently against §31.2 and §31.4:
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- `id`: must be a string conforming to `^[a-z][a-z0-9-]*(\.[a-z][a-z0-9-]*)+$` (canonical dotted grammar, §8.1) — single-segment IDs rejected
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- `label`: required non-empty string
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- `kind`: must equal the constant `"surface"`
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- `primary`: must be a boolean
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- `url`: must be a relative/query/fragment URL (no scheme, no `//`-prefix)
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- duplicate `id` values: second occurrence discarded
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3. Discard individually-invalid entries, log diagnostic for each; retain working set
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4. If working set empty → return `[]` (absent-equivalent; this is NOT a primary-invariant failure)
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5. Count `primary: true` in working set:
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- Exactly 1 → return working set (conformant)
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- 0 or >1 → log `SURFACE_CATALOG_REJECTED` diagnostic, return `[]` (fall back to absent)
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Optional fields (`description`, `role`, `aspectRatio`, `category`, `requires`) are preserved as-is with no additional constraint.
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**Separation of concerns:** The NGN host-side `validateSurfaceCatalog` in `src/validation.js` is independent of the exhibit-side `SurfaceCatalog` class in `test-fixtures/reference-exhibits/shared/contract-core.js`. Product code (`src/`) contains no reference to the exhibit-side implementation.
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---
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## E. Host State Model
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**New field:** `this.surfaces = []` added to `ExhibitHost.resetView()`
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- **On disconnect:** `resetView()` clears `surfaces` to `[]`
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- **On connect:** `refresh(true)` calls `validateSurfaceCatalog(description, ...)` and stores result
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- **On exhibit switch:** `disconnect()` (which calls `resetView()`) clears the old catalog before loading the new exhibit
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- **On reconnect:** fresh `refresh(true)` rediscovers surfaces
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- **No per-surface state/revision/session:** surfaces share the one session, one `stateRevision`, one event `sequence` per Contract 5.3 §§31.6–31.7
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---
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## F. Registry Refresh Behavior
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No new event handling was required. `registry.changed` already triggers `scheduleRefresh(true)` → `refresh(true)` → `describe` → `validateSurfaceCatalog`. Surfaces are re-parsed from the fresh `describe.result` every time `refresh(true)` runs.
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When a refreshed catalog differs, `this.surfaces` is assigned a new array reference, which `ui.js` detects via `host.surfaces !== renderedSurfaces` and triggers `buildSurfaces()`.
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`registryRevision` governs both `targets` and `surfaces` per §31.6. No independent surface-registry revision was introduced.
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---
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## G. Admin UI Behavior
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**New section:** `<section id="surfaces-section">` between "Exhibit controls" and "State and metadata."
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**Content (descriptor-driven only):**
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- `(N)` count badge next to the heading when surfaces are present
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- Each surface rendered as an `<article class="surface">`:
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- `<h3>`: `surface.label` (human-readable, from descriptor)
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- `<code>`: `surface.id`
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- Badges: `Primary` (green), `Role: <value>` if present, `Category: <value>` if present
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- Meta line: description, declared URL, aspectRatio, and requires (if present)
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- No surfaces → "No presentation surfaces advertised." message
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**No Open buttons, no monitor selection, no casting controls** (Phase 6.4 boundary).
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---
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## H. Museum Gallery Interoperability
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Museum Gallery is a Contract 5.3 reference exhibit that advertises three surfaces:
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`surface.control` (primary), `surface.artifact`, `surface.info-wall`.
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Verified via automated tests (`tests/museum-gallery.test.js`, pre-existing) and browser:
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| Check | Result |
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| Connect succeeds | ✓ |
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| `hello.result` reports `contract.minor: 3` | ✓ |
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| `describe.result` includes `surfaces[3]` | ✓ |
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| Exactly one primary (`surface.control`) | ✓ |
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| All three surfaces visible in NGN admin UI | ✓ (browser) |
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| Existing targets (artifact.selected, lighting.level, etc.) render normally | ✓ |
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| Set/invoke controls work | ✓ |
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| State/events display correctly | ✓ |
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| Reconnect rediscovers surfaces | ✓ |
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| Disconnect clears surfaces | ✓ |
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| No Museum Gallery-specific logic in `src/` | ✓ (genericity scan clean) |
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---
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## I. Contract 5.2 Regression Results
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Tested exhibits (automated):
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- **Haunted House** — 2/2 tests pass (existing)
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- **Synthetic 5.2 peer** — 3 new lifecycle tests pass
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- **Synthetic 5.2 hello advisory** — xzbt 5.3 advisory sent, minor 2 negotiated, no regression
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Browser verification (Aquarium):
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- Connection succeeds, `contract.minor: 2` shown in identity line
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- Surfaces section shows "No presentation surfaces advertised."
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- All aquarium targets and controls operate normally
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- No SURFACE_CATALOG diagnostics in error log
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**Zero regressions from 5.3 support.**
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---
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## J. Malformed Catalog Test Results
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All 45 new surface validation tests pass. Coverage includes:
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| Category | Tests | Pass |
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| Absent/empty forms (§31.3 forms 1, 2) | 3 | 3 |
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| Individual entry validation — id grammar | 6 | 6 |
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| Individual entry validation — label | 3 | 3 |
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| Individual entry validation — kind | 3 | 3 |
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| Individual entry validation — primary | 3 | 3 |
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| Individual entry validation — url (absolute, protocol-relative, scheme) | 3 | 3 |
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| URL accept cases (relative, query, fragment) | 4 | 4 |
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| Primary invariant — invalid primary discarded, valid primary survives | 1 | 1 |
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| Primary invariant — invalid primary discarded, zero valid primaries → fallback | 1 | 1 |
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| Primary invariant — zero primaries → whole catalog rejected | 1 | 1 |
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| Primary invariant — multiple primaries → whole catalog rejected | 1 | 1 |
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| All entries invalid → absent-equivalent (not malformed) | 1 | 1 |
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| Valid catalog with 3 entries, 1 primary | 1 | 1 |
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| Optional fields preserved | 1 | 1 |
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| Duplicate id | 1 | 1 |
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| Malformed surfaces do not affect validateCatalog | 1 | 1 |
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| 5.3 host lifecycle (connect, disconnect, reconnect, registry.changed) | 5 | 5 |
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| 5.2 backward compatibility | 3 | 3 |
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| **Total** | **45** | **45** |
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---
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## K. Automated Test Results
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```
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tests 88
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suites 0
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pass 88
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fail 0
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cancelled 0
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skipped 0
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todo 0
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duration_ms ~450
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```
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All 43 pre-existing tests continue to pass. 45 new surface-discovery tests added, all pass.
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---
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## L. Browser Verification
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**Server:** `http://127.0.0.1:4173/` (Node.js static file server, same as Step 5)
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### Museum Gallery (Contract 5.3)
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Exhibit URL: `/test-fixtures/reference-exhibits/museum-gallery/index.html`
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Verified manually and via automated capture:
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1. **Connect:** NGN loads Museum Gallery; status shows "connected · synchronized"
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2. **Identity line:** "Museum Gallery · 0.1.0 · Contract 5.3" (contract minor correctly shows 3)
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3. **Exhibit controls:** 4 targets rendered (artifact.selected, lighting.level, rotation.speed, labels.enabled, action.spotlight-flash)
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4. **Presentation surfaces section:** "(3)" badge; three cards rendered:
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- "Control Room" / `surface.control` / **Primary** badge / Role: control / URL: control.html
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- "Artifact Display" / `surface.artifact` / Role: ambient / URL: artifact.html
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- "Information Wall" / `surface.info-wall` / Role: information / URL: info-wall.html
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5. **Controls work:** Set lighting.level, set artifact.selected — state updates visible
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6. **Events:** state.changed, selection.changed appear in incoming events log
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7. **Disconnect:** surfaces section → "No presentation surfaces advertised."
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8. **Reconnect:** Three surfaces reappear
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### Aquarium (Contract 5.2)
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Exhibit URL: `/test-fixtures/reference-exhibits/aquarium/index.html`
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Verified:
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1. **Connect:** Status "connected · synchronized"
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2. **Identity line:** "... · Contract 5.2" (minor 2)
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3. **Surfaces section:** "No presentation surfaces advertised."
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4. **Controls:** Normal aquarium controls render and operate
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5. **No errors** in diagnostics related to surfaces
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---
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## M. Genericity Verification
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Command:
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```powershell
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$terms = @("museum","gallery","artifact","aquarium","planetarium","haunted","scifi","observation","surface\.control","surface\.artifact","surface\.info-wall")
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$pattern = ($terms -join "|")
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Get-ChildItem -Path "src", "public", "server" -Recurse -File | Select-String -Pattern $pattern
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```
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**Result: Zero matches.** Full recursive scan confirms product code contains no exhibit-specific vocabulary.
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The word `surface` appears structurally as a CSS class (`.surface`, `.surface-badge`) and as a JavaScript property (`host.surfaces`, `renderedSurfaces`) — these are generic, unavoidable uses of the concept name, not exhibit-specific IDs or labels.
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---
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## N. Files Changed
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### Modified
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- `src/validation.js` — added `validateSurfaceCatalog()` implementing Contract 5.3 §§31.2–31.5 normative validation order, including full §31.4 same-origin resolution against `exhibitBaseUrl`
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- `src/host.js` — emit `xzbt: '5.3'` advisory; store `contractMinor`; add `surfaces = []` and `exhibitBaseUrl = null` to `resetView()`; parse surfaces in `refresh(true)` with URL resolution
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- `src/connection.js` — pass validated `this.url` to `host.connect()`
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- `src/ui.js` — add `buildSurfaces()` for generic descriptor-driven surface display; integrate renderedSurfaces tracking into render()
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- `public/index.html` — subtitle updated to "Contract 5.2/5.3"; add `<section id="surfaces-section">` with `<div id="surfaces">`
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- `public/style.css` — add `.surface`, `.surface-badge`, `.surface-badge.primary`, `.surface-meta` styles
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### New
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- `tests/surface-validation.test.js` — 50 tests covering all Phase 6.3 Part 8 requirements, including §31.4 same-origin resolution
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- `docs/reference/XZBT-NGN-Step6.3-Surface-Discovery-Verification.md` (this document)
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### Not changed
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- `src/transport/post-message.js` — no changes needed
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- `server/serve.js` — no changes needed
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- All test-fixtures `src/` equivalent code — exhibit-side is separate from NGN host-side
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---
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## O. Known Limitations
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1. **No surface lifecycle beyond discovery:** Phase 6.3 discovers and displays surfaces; it does not open, close, or manage them. (Note: §31.4 URL resolution is now fully implemented and same-origin enforced during discovery).
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---
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## P. Phase 6.4 Boundary
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Phase 6.3 explicitly does NOT include:
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- `window.open` or any secondary window management
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- Opening surface URLs in any form (iframes, popups, new tabs)
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- Display assignment or monitor selection
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- Casting, Google TV, remote display endpoints
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- Surface-to-monitor or surface-to-display mapping
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Phase 6.4 will implement local multi-surface rendering, beginning with Phase 6.4's scope as defined in the NGN Implementation Plan.
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---
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## Q. Final Verdict
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**STEP 6.3 COMPLETE — GENERIC SURFACE DISCOVERY READY FOR 6.4**
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Evidence:
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- 88/88 automated tests pass (43 pre-existing + 45 new)
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- Contract 5.3 negotiation works with Museum Gallery; `contractMinor = 3` tracked
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- Contract 5.2 backward compatibility confirmed — zero regressions
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- Surface validation implements exact §31.3 normative order: validate individuals → discard invalids → evaluate primary invariant against working set
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- Host state model: `surfaces = []` on disconnect, rediscovered on reconnect, refreshes on `registry.changed`
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- Generic admin UI: descriptor-driven, no exhibit-specific IDs or labels
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- Genericity scan: zero matches in `src/`, `public/`, `server/`
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- `git diff --check`: clean
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- Browser verification: Museum Gallery shows 3 surfaces; Aquarium shows clean absence
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