Sharepoint-Toolbox/.planning/phases/19-app-registration-removal/19-01-SUMMARY.md

phase, plan, subsystem, tags, dependency_graph, tech_stack, key_files, decisions, metrics

phase	plan	subsystem	tags	dependency_graph	tech_stack	key_files	decisions	metrics
19-app-registration-removal	01	Services / Models	graph-api app-registration msal unit-tests	requires provides affects GraphClientFactory MsalClientFactory ISessionManager IAppRegistrationService AppRegistrationService AppRegistrationResult TenantProfile	added patterns sequential-registration-with-rollback transitiveMemberOf-admin-check MSAL-session-eviction	created modified SharepointToolbox/Core/Models/AppRegistrationResult.cs SharepointToolbox/Services/IAppRegistrationService.cs SharepointToolbox/Services/AppRegistrationService.cs SharepointToolbox.Tests/Services/AppRegistrationServiceTests.cs SharepointToolbox/Core/Models/TenantProfile.cs	AppRegistrationService uses AppGraphClientFactory alias to disambiguate from Microsoft.Graph.GraphClientFactory (same pattern as GraphUserDirectoryService) PostAsync/DeleteAsync calls use named cancellationToken: ct parameter — Kiota-based Graph SDK v5 signatures have requestConfig as second positional arg BuildRequiredResourceAccess declared internal (not private) to enable direct unit testing without live Graph calls SharePoint AllSites.FullControl GUID (56680e0d-d2a3-4ae1-80d8-3c4a5c70c4a6) marked LOW confidence in code comment — must be verified against live tenant	duration completed tasks_completed files_created files_modified 4 minutes 2026-04-09 2 4 1

Phase 19 Plan 01: AppRegistrationService — Models, Interface, Implementation, and Tests Summary

One-liner: AppRegistrationService with atomic Graph API registration/rollback using transitiveMemberOf admin check, MSAL eviction, and AppRegistrationResult discriminated result type.

Tasks Completed

#	Name	Commit	Key Files
1	Models + Interface + Service implementation	93dbb8c	AppRegistrationResult.cs, TenantProfile.cs, IAppRegistrationService.cs, AppRegistrationService.cs
2	Unit tests for AppRegistrationService	8083cdf	AppRegistrationServiceTests.cs

What Was Built

AppRegistrationResult (Core/Models)

Discriminated result type with three static factory methods:

• Success(appId) — IsSuccess=true, carries appId
• Failure(message) — IsSuccess=false, carries error message
• FallbackRequired() — IsFallback=true, neither success nor error

TenantProfile (Core/Models)

Added nullable AppId property. Defaults to null; stored to JSON via System.Text.Json when ProfileService persists profiles.

IAppRegistrationService (Services)

Four-method interface:

• IsGlobalAdminAsync — transitiveMemberOf check, returns false on any exception
• RegisterAsync — sequential 4-step registration with rollback on failure
• RemoveAsync — deletes by appId, swallows exceptions (logs warning)
• ClearMsalSessionAsync — SessionManager + MSAL account eviction + cache unregister

AppRegistrationService (Services)

Full implementation using GraphClientFactory (identical alias pattern to GraphUserDirectoryService). Registration flow:

1. Create Application object with RequiredResourceAccess (Graph + SharePoint scopes)
2. Create ServicePrincipal with AppId
3. Look up Microsoft Graph resource SP by filter
4. Look up SharePoint Online resource SP by filter
5. Post OAuth2PermissionGrant for Graph delegated scopes
6. Post OAuth2PermissionGrant for SharePoint delegated scopes
7. Rollback (best-effort DELETE) if any step fails

Unit Tests (12 passing)

• AppRegistrationResult: 3 factory method tests
• TenantProfile.AppId: null default + JSON round-trip (null and non-null)
• Service constructor/interface check
• BuildRequiredResourceAccess: 2 resources, 4 Graph scopes, 1 SharePoint scope, all Type="Scope"

Deviations from Plan

Auto-fixed Issues

1. [Rule 3 - Blocking] GraphClientFactory namespace ambiguity

• Found during: Task 1 build
• Issue: GraphClientFactory is ambiguous between SharepointToolbox.Infrastructure.Auth.GraphClientFactory and Microsoft.Graph.GraphClientFactory
• Fix: Applied AppGraphClientFactory alias (same pattern used in GraphUserDirectoryService)
• Files modified: AppRegistrationService.cs
• Commit: 93dbb8c

2. [Rule 3 - Blocking] Graph SDK v5 PostAsync CancellationToken position

• Found during: Task 1 build
• Issue: PostAsync(body, ct) fails — Kiota-based SDK expects (body, requestConfig?, cancellationToken) so ct was matched to requestConfig parameter
• Fix: Used named parameter cancellationToken: ct on all PostAsync calls
• Files modified: AppRegistrationService.cs
• Commit: 93dbb8c

3. [Rule 3 - Blocking] Using alias placement in test file

• Found during: Task 2 compile
• Issue: Placed using aliases at bottom of file — C# requires all using declarations before namespace body
• Fix: Moved aliases to top of file with other using directives
• Files modified: AppRegistrationServiceTests.cs
• Commit: 8083cdf

Self-Check: PASSED

Files exist:

• SharepointToolbox/Core/Models/AppRegistrationResult.cs — FOUND
• SharepointToolbox/Core/Models/TenantProfile.cs — FOUND (modified)
• SharepointToolbox/Services/IAppRegistrationService.cs — FOUND
• SharepointToolbox/Services/AppRegistrationService.cs — FOUND
• SharepointToolbox.Tests/Services/AppRegistrationServiceTests.cs — FOUND

Commits verified:

• 93dbb8c — feat(19-01): add AppRegistrationService with rollback, model, and interface
• 8083cdf — test(19-01): add unit tests for AppRegistrationService and models

Tests: 12 passed, 0 failed Build: 0 errors, 0 warnings