DELIVERABLES — Hip Hip Groups & Sharing (P029)

Summary

Full-stack implementation of group-based list sharing for the Hip Hip todo app. Extends P028 backend (Go + PostgreSQL) and frontend (React + TypeScript) with group CRUD, invitation flow, membership management, list sharing, role-based access control, and dataloaders for N+1 prevention.

Lines of code: ~23,205 total (16,491 Go + 6,714 TypeScript) Files: 102 (41 Go + 61 TypeScript)

Test Results

Backend (from go test ./...)

ok  	github.com/jonathanleahy/hip-hip/e2e_test
ok  	github.com/jonathanleahy/hip-hip/internal/adapters/graph
ok  	github.com/jonathanleahy/hip-hip/internal/app
ok  	github.com/jonathanleahy/hip-hip/internal/domain

Total Go tests: 200 passing
  - Domain validation: 46 tests
  - App services (with mocks): 86 tests
  - GraphQL resolvers: 8 tests
  - E2E (with mock repos): 60 tests

Frontend (from npx vitest run)

 Test Files  20 passed (20)
      Tests  190 passed (190)

Combined Total

Lint Results

Go vet: PASS (no issues)
Go build: PASS
TypeScript: PASS (no type errors)

Full output in docs/lint-output.txt.

Post-Development Gate Verification

• [x] go vet ./... — clean, no warnings
• [x] go build ./... — compiles without errors
• [x] go.mod version (1.25) matches Dockerfile builder image (golang:1.25-alpine)
• [x] go test ./... — 200 tests passing
• [x] npx tsc --noEmit — no type errors
• [x] npx vitest run — 190 tests passing
• [x] .gitignore files created (root, backend, frontend)
• [x] Frontend component visual checklist: GroupCard renders color border, MemberAvatar renders colored circle with initials, role badges use solid colors (teal/amber/stone), InviteModal shows link state with copy button, MemberList compact mode renders avatar row with overflow indicator

Features Implemented

Backend (Go)

Frontend (React + TypeScript)

Nice-to-Have Features

All features are must-have per the spec. No nice-to-have features were defined.

Deferred

None. All 20 functional requirements fully implemented.

Review Iteration 3 Changes

The following fixes were applied in response to review consensus (iteration 2 → 3):

Backend Authorization (FIX-001, FIX-002, FIX-003)

• FIX-001 (Critical): Fixed viewer write bypass in todo_service.go — verifyListAccess now checks m.Role == "admin" || m.Role == "member" instead of list.Permission == "write". Added 3 tests.
• FIX-002 (Major): Added group-aware access control to UpdateList in list_service.go — non-creator, non-admin members/viewers now receive ErrAdminRequired. Added 2 tests.
• FIX-003 (Major): Updated DeleteList in list_service.go to allow group admins (not just creator) to delete shared lists. Added 2 tests.

Frontend Features (FIX-004 through FIX-015)

• FIX-004/005: Login/Register redirect support with open redirect prevention (relative-path-only validation).
• FIX-006: Invitation page URL-encodes redirect path via encodeURIComponent.
• FIX-007: Dashboard shows "My Groups" section with GroupCards and "View all" link.
• FIX-008: Permission-based UI in ListDetailPage — viewers see read-only items (no drag handles, disabled checkboxes, no click-to-detail, hidden AddTodo/edit/delete).
• FIX-009: InviteModal transitions to link state after successful invite — shows copyable URL, "Copy Link" button, "Invite Another" reset.
• FIX-010: MemberList compact mode — horizontal avatar row, max 5 visible, "+N" overflow indicator.
• FIX-011: GroupSettingsPage — added icon/color form fields, non-admin redirect via useEffect.
• FIX-013: InvitationPage — separate expired/accepted/declined states, HippoMascot moods, decline navigates to /.
• FIX-014: MemberList role badge colors (admin=teal-600, member=amber-600, viewer=stone-400), remove member confirmation dialog.
• FIX-015: GroupsPage empty state mood "waving", GroupViewPage settings gear admin-only, empty lists HippoMascot.

FR Criterion Coverage

Known Issues

None. All tests pass, all lint checks clean.

Database Migrations