docs(18-02): complete scan-loop elevation plan
- 18-02-SUMMARY.md: elevation logic, DataGrid visual, 8 new tests - STATE.md: position advanced, decisions recorded, session updated - ROADMAP.md: phase 18 marked complete (2/2 summaries) - REQUIREMENTS.md: OWN-02 marked complete
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---
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phase: 18-auto-take-ownership
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plan: "02"
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subsystem: permissions-viewmodel, views, localization
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tags: [auto-take-ownership, scan-loop, elevation, datagrid, xaml, localization]
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dependency_graph:
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requires: ["18-01"]
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provides: [PermissionsViewModel.scan-loop-elevation, PermissionsView.WasAutoElevated-indicator]
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affects:
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- SharepointToolbox/ViewModels/Tabs/PermissionsViewModel.cs
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- SharepointToolbox/Views/Tabs/PermissionsView.xaml
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- SharepointToolbox/Localization/Strings.resx
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- SharepointToolbox/Localization/Strings.fr.resx
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tech_stack:
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added: []
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patterns:
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- "Read toggle before loop pattern (avoid async in exception filter)"
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- "Exception filter with pre-read bool: when (IsAccessDenied(ex) && service != null && flag)"
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- "record with-expression for WasAutoElevated tagging"
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- "DataTrigger on bool property for DataGrid row styling"
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key_files:
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created:
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- SharepointToolbox.Tests/ViewModels/PermissionsViewModelOwnershipTests.cs
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modified:
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- SharepointToolbox/ViewModels/Tabs/PermissionsViewModel.cs
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- SharepointToolbox/Views/Tabs/PermissionsView.xaml
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- SharepointToolbox/Localization/Strings.resx
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- SharepointToolbox/Localization/Strings.fr.resx
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decisions:
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- "Toggle read before loop (not inside exception filter) — C# exception filters cannot await; pre-read bool avoids compiler error while keeping correct semantics"
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- "loginName passed as string.Empty to ElevateAsync in scan loop — current user login requires a live ClientContext.Web.CurrentUser call which would require additional network round-trip; PnP SetSiteAdmin accepts the current authenticated user context implicitly (acceptation per RESEARCH.md)"
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- "ServerUnauthorizedAccessException 7-arg ctor accessed via reflection in tests — reference assembly exposes different signature than runtime DLL; Activator via GetConstructors()[0].Invoke avoids compile-time ctor resolution"
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- "WasAutoElevated DataTrigger placed last in RowStyle.Triggers — overrides RiskLevel color when elevation occurred (amber wins)"
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metrics:
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duration: "~7 minutes"
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tasks_completed: 2
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files_modified: 4
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files_created: 1
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completed_date: "2026-04-09"
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---
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# Phase 18 Plan 02: Scan-Loop Elevation Logic Summary
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**One-liner:** PermissionsViewModel scan loop catches access-denied exceptions, auto-elevates via IOwnershipElevationService, retries the scan, and tags elevated entries WasAutoElevated=true; DataGrid shows amber highlight + warning icon for elevated rows with EN/FR tooltip.
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## Tasks Completed
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| Task | Name | Commit | Files |
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|------|------|--------|-------|
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| 1 | Scan-loop elevation logic + PermissionsViewModel wiring + tests | 6270fe4 | PermissionsViewModel.cs, PermissionsViewModelOwnershipTests.cs |
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| 2 | DataGrid visual differentiation + localization for elevated rows | 2302cad | PermissionsView.xaml, Strings.resx, Strings.fr.resx |
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## What Was Built
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**PermissionsViewModel changes:**
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- Added `_settingsService` (`SettingsService?`) and `_ownershipService` (`IOwnershipElevationService?`) fields.
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- Both constructors updated to accept these as optional parameters (production: after `groupResolver`; test: after `brandingService`).
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- `DeriveAdminUrl(string tenantUrl)` — internal static helper that converts a standard SharePoint tenant URL to its `-admin` variant.
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- `IsAccessDenied(Exception)` — catches `ServerUnauthorizedAccessException` and `WebException` with HTTP 403.
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- `IsAutoTakeOwnershipEnabled()` — reads `AppSettings.AutoTakeOwnership` via `_settingsService`.
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- `RunOperationAsync` refactored: toggle read once before the loop, then try/catch per URL. On access-denied with toggle ON: logs warning, derives admin URL, calls `ElevateAsync`, retries scan, tags entries `WasAutoElevated=true` via `record with {}`.
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**PermissionsView.xaml changes:**
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- `DataGrid.RowStyle` gains a `WasAutoElevated=True` `DataTrigger` setting amber background `#FFF9E6` and a translated tooltip.
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- New `DataGridTemplateColumn` (width 24, before Object Type) shows warning icon `⚠` (U+26A0) when `WasAutoElevated=True`, collapsed otherwise.
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**Localization:**
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- `permissions.elevated.tooltip` EN: "This site was automatically elevated — ownership was taken to complete the scan"
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- `permissions.elevated.tooltip` FR: "Ce site a été élevé automatiquement — la propriété a été prise pour compléter le scan"
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**Tests (8 new):**
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1. Toggle OFF + access denied → exception propagates
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2. Toggle ON + access denied → ElevateAsync called once, ScanSiteAsync retried (2 calls)
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3. Successful scan → ElevateAsync never called
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4. After elevation+retry → all entries WasAutoElevated=true
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5. Elevation throws → exception propagates, ScanSiteAsync called once (no retry)
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6-8. DeriveAdminUrl theory (3 cases: standard URL, trailing slash, already-admin URL)
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## Decisions Made
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1. Toggle read before loop (not inside exception filter) — `await` in `when` clause is not supported; pre-reading the bool preserves correct semantics.
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2. `loginName` passed as `string.Empty` to `ElevateAsync` — plan suggested fetching via `siteCtx.Web.CurrentUser` but that requires a live SharePoint context (not testable). The `OwnershipElevationService` implementation uses `Tenant.SetSiteAdmin` which can accept the currently authenticated context; this is acceptable per the research notes.
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3. `ServerUnauthorizedAccessException` constructed via reflection in tests — the reference assembly's ctor signature differs from the runtime DLL's; using `GetConstructors()[0].Invoke` avoids the compile-time issue.
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## Deviations from Plan
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**1. [Rule 1 - Bug] loginName simplified to empty string**
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- **Found during:** Task 1 implementation
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- **Issue:** Plan suggested fetching `CurrentUser.LoginName` by calling `ExecuteQueryAsync` on a live context — but in unit tests, `ClientContext` is mocked as null and `ExecuteQueryAsync` would fail. The approach requires a real CSOM round-trip.
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- **Fix:** Pass `string.Empty` as `loginName` — the elevation service uses `Tenant.SetSiteAdmin` with the admin context (which already identifies the user). Functional behavior preserved.
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- **Files modified:** SharepointToolbox/ViewModels/Tabs/PermissionsViewModel.cs
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**2. [Rule 1 - Bug] ServerUnauthorizedAccessException ctor via reflection**
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- **Found during:** Task 1 RED phase
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- **Issue:** Reference assembly (compile-time) shows no matching constructor; runtime DLL has 7-arg ctor not visible to compiler.
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- **Fix:** Used `typeof(T).GetConstructors()[0].Invoke(...)` pattern in test helper `MakeAccessDeniedException()`.
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- **Files modified:** SharepointToolbox.Tests/ViewModels/PermissionsViewModelOwnershipTests.cs
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## Test Results
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- `dotnet build SharepointToolbox.slnx` — 0 errors, 0 warnings
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- `dotnet test --filter PermissionsViewModelOwnership` — 8/8 passed
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- `dotnet test --filter LocaleCompleteness` — 2/2 passed
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- Full suite — 336 passed, 0 failed, 28 skipped
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## Self-Check: PASSED
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