---
phase: 02-permissions
plan: 03
subsystem: api
tags: [sharepoint, pnp-framework, tenant-admin, site-listing, csharp]

# Dependency graph
requires:
  - phase: 01-foundation
    provides: SessionManager.GetOrCreateContextAsync, TenantProfile, OperationProgress
provides:
  - ISiteListService interface for ViewModel mocking
  - SiteListService tenant admin API wrapper enumerating all sites
  - SiteInfo record model (Url, Title)
affects: [02-06-site-picker-dialog, 02-permissions-viewmodel]

# Tech tracking
tech-stack:
  added: []
  patterns:
    - "Admin URL derivation: Regex transform contoso.sharepoint.com → contoso-admin.sharepoint.com"
    - "ServerException wrapping: Access denied → InvalidOperationException with actionable message"
    - "InternalsVisibleTo pattern for testing internal static helpers without making them public"

key-files:
  created:
    - SharepointToolbox/Core/Models/SiteInfo.cs
    - SharepointToolbox/Services/ISiteListService.cs
    - SharepointToolbox/Services/SiteListService.cs
  modified:
    - SharepointToolbox/AssemblyInfo.cs
    - SharepointToolbox.Tests/Services/SiteListServiceTests.cs

key-decisions:
  - "DeriveAdminUrl is internal static (not private) so tests can call it directly without a live tenant"
  - "InternalsVisibleTo added to AssemblyInfo.cs — plan specified internal visibility but omitted the assembly attribute needed to test it"
  - "OneDrive personal sites filtered by -my.sharepoint.com URL pattern in addition to Active status check"

patterns-established:
  - "Admin URL derivation: use Regex.Replace with (https://[^.]+)(\\.sharepoint\\.com) pattern"
  - "Tenant admin access: pass synthetic TenantProfile with admin URL to SessionManager.GetOrCreateContextAsync"

requirements-completed: [PERM-02]

# Metrics
duration: 1min
completed: 2026-04-02
---

# Phase 2 Plan 3: SiteListService Summary

**ISiteListService + SiteListService wrapper for SharePoint tenant admin API using PnP.Framework Tenant.GetSitePropertiesFromSharePoint, with admin URL regex derivation and ServerException-to-InvalidOperationException wrapping**

## Performance

- **Duration:** 1 min
- **Started:** 2026-04-02T11:48:57Z
- **Completed:** 2026-04-02T11:50:40Z
- **Tasks:** 1 (TDD: RED + GREEN)
- **Files modified:** 5

## Accomplishments

- SiteInfo record model created in Core/Models
- ISiteListService interface defined — enables ViewModel mocking in Plan 06 (SitePickerDialog)
- SiteListService derives admin URL via Regex, connects via SessionManager to tenant admin endpoint
- Active-only filtering with OneDrive personal site exclusion (-my.sharepoint.com)
- DeriveAdminUrl tested with 2 unit tests (standard URL, trailing-slash URL)

## Task Commits

Each task was committed atomically:

1. **Task 1 RED: SiteListServiceTests (failing)** - `5c10840` (test)
2. **Task 1 GREEN: ISiteListService, SiteListService, SiteInfo** - `78b3d4f` (feat)

**Plan metadata:** _(pending)_

_Note: TDD task has two commits (test RED → feat GREEN); no REFACTOR step needed — code is clean as written_

## Files Created/Modified

- `SharepointToolbox/Core/Models/SiteInfo.cs` - Simple record with Url and Title properties
- `SharepointToolbox/Services/ISiteListService.cs` - Interface contract for GetSitesAsync
- `SharepointToolbox/Services/SiteListService.cs` - Implementation: admin URL derivation, tenant query, filtering, error wrapping
- `SharepointToolbox/AssemblyInfo.cs` - Added InternalsVisibleTo("SharepointToolbox.Tests")
- `SharepointToolbox.Tests/Services/SiteListServiceTests.cs` - Two unit tests for DeriveAdminUrl

## Decisions Made

- DeriveAdminUrl marked `internal static` rather than `private static` to allow direct unit testing without mocking a full SessionManager
- `InternalsVisibleTo("SharepointToolbox.Tests")` added to AssemblyInfo.cs — this is the standard .NET approach for testing internal members (Rule 3 deviation, see below)
- OneDrive sites excluded by URL pattern (`-my.sharepoint.com`) in addition to `Status == "Active"` to avoid returning personal storage sites in the picker

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 3 - Blocking] Added InternalsVisibleTo to expose internal DeriveAdminUrl to test project**
- **Found during:** Task 1 GREEN (test compilation failed with CS0117)
- **Issue:** Plan specified `internal static` for DeriveAdminUrl for testability, but did not include the `InternalsVisibleTo` assembly attribute required for the test project to access it
- **Fix:** Added `[assembly: InternalsVisibleTo("SharepointToolbox.Tests")]` to AssemblyInfo.cs
- **Files modified:** SharepointToolbox/AssemblyInfo.cs
- **Verification:** Tests compile and both DeriveAdminUrl tests pass (2/2)
- **Committed in:** 78b3d4f (GREEN commit)

---

**Total deviations:** 1 auto-fixed (1 blocking)
**Impact on plan:** Necessary for test infrastructure — plan's intent was clearly to test internal method; InternalsVisibleTo is the standard mechanism. No scope creep.

## Issues Encountered

None

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness

- ISiteListService ready for injection into SitePickerDialog (Plan 06)
- SiteListService compiles and DeriveAdminUrl verified; live tenant testing requires admin credentials (handled at runtime via SessionManager interactive login)
- Full test suite: 53 pass, 4 skip, 0 fail

## Self-Check: PASSED

- FOUND: SharepointToolbox/Core/Models/SiteInfo.cs
- FOUND: SharepointToolbox/Services/ISiteListService.cs
- FOUND: SharepointToolbox/Services/SiteListService.cs
- FOUND: .planning/phases/02-permissions/02-03-SUMMARY.md
- FOUND: commit 5c10840 (test RED)
- FOUND: commit 78b3d4f (feat GREEN)

---
*Phase: 02-permissions*
*Completed: 2026-04-02*