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+---
+phase: 08-engagement-user-profile-new
+plan: "01"
+subsystem: mobile-engagement
+tags: [mobile, engagement, msgraph, photo-proxy, api]
+dependency_graph:
+  requires: []
+  provides:
+    - GET /api/mobile/engagement/user/[userId]/photo
+    - MsGraphClient.getUserPhotoBytes(userId)
+  affects:
+    - lib/services/msgraph-client.ts
+    - app/api/mobile/engagement/user/[userId]/photo/route.ts
+tech_stack:
+  added: []
+  patterns:
+    - Binary photo proxy via NextResponse with ArrayBuffer
+    - Graph photo fetch via reused getToken() OAuth2 cache
+key_files:
+  modified:
+    - lib/services/msgraph-client.ts
+  created:
+    - app/api/mobile/engagement/user/[userId]/photo/route.ts
+decisions:
+  - "userId validation is permissive (length + denylist) not GUID-strict — graph_users.id is VARCHAR(255) and accepts UPN-style identifiers per migration 041"
+  - "Cache-Control: private, max-age=3600 on 200 — private because response is per-authenticated-user even though photo is keyed on Graph userId"
+  - "502 (not 503) for Graph upstream errors — 503 is reserved for the unconfigured-MSGRAPH case (D-26)"
+  - "No retry in getUserPhotoBytes — photo fetches are best-effort per D-26; fetchJson's 429-retry is overkill for binary media"
+metrics:
+  duration_minutes: 2
+  completed_date: "2026-05-08"
+  tasks_completed: 2
+  files_modified: 1
+  files_created: 1
+requirements_addressed: [ENG-06]
+---
+
+# Phase 8 Plan 01: MS Graph Photo Proxy Summary
+
+**One-liner:** Server-side photo proxy at `/api/mobile/engagement/user/[userId]/photo` backed by a new `MsGraphClient.getUserPhotoBytes()` method — returns JPEG/PNG bytes or neutral 404/503, gated by `requireAuth()`.
+
+## Tasks Completed
+
+| Task | Name | Commit | Files |
+|------|------|--------|-------|
+| 1 | Add getUserPhotoBytes() to MsGraphClient | 3f6b135 | lib/services/msgraph-client.ts |
+| 2 | Add /api/mobile/engagement/user/[userId]/photo route | 4978780 | app/api/mobile/engagement/user/[userId]/photo/route.ts |
+
+## What Was Built
+
+**Task 1 — `MsGraphClient.getUserPhotoBytes(userId)`** (`lib/services/msgraph-client.ts`)
+
+New public async method inserted as a sibling of the user-scoped methods (before `getUserCalendarEvents`). It:
+- Calls `this.getToken()` to reuse the existing OAuth2 client_credentials token cache (no per-request token churn)
+- Issues a bare `fetch` to `https://graph.microsoft.com/v1.0/users/{encodeURIComponent(userId)}/photo/$value` with only the `Authorization: Bearer` header (no `Accept: application/json` — the endpoint returns binary)
+- Returns `null` on 404 (user has no photo — normal outcome)
+- Throws `Error(Graph photo error ${status}...)` on other non-2xx for the caller to map to 502
+- Returns `{ bytes: ArrayBuffer, contentType: string }` on 2xx (defaults content-type to `image/jpeg` if Graph omits the header)
+- No retry logic — best-effort per D-26
+
+**Task 2 — `/api/mobile/engagement/user/[userId]/photo` route** (`app/api/mobile/engagement/user/[userId]/photo/route.ts`)
+
+New GET handler that:
+1. Calls `requireAuth()` first (mandatory — middleware whitelists `/api/mobile/*` without pre-gating)
+2. Returns 503 if `isMsgraphConfigured()` is false (D-26)
+3. Validates `userId` with a permissive denylist (rejects `/`, `?`, `#`, `..`, whitespace, empty, >128 chars) — NOT a strict GUID regex (per migration 041 `graph_users.id VARCHAR(255)` which accepts UPN-form IDs)
+4. Calls `client.getUserPhotoBytes(userId)` and returns binary bytes with `Content-Type` + `Cache-Control: private, max-age=3600` on success (D-25)
+5. Returns neutral 404 when `getUserPhotoBytes` returns null
+6. Returns neutral 502 on any thrown error (no userId or token echoed in response body)
+
+## Deviations from Plan
+
+None — plan executed exactly as written.
+
+## Known Stubs
+
+None — this plan delivers a complete, wired endpoint with no placeholder data.
+
+## Threat Flags
+
+No new security surface beyond what is catalogued in the plan's `<threat_model>`. All high-severity threats mitigated:
+- T-08-06 (Spoofing/unauthenticated): `requireAuth()` is first call in handler — verified at line 10, before any Graph interaction.
+- T-08-03 (Path traversal): userId denylist + `encodeURIComponent` in `getUserPhotoBytes`.
+- T-08-02 (DoS/rate amplification): `Cache-Control: private, max-age=3600` + early 400 on invalid userId.
+- T-08-04 (Info disclosure oracle): 404 and 502 responses use neutral copy with no userId echo.
+- T-08-05 (Token leak via logs): `console.error` logs the Error object (status text only), not the bearer token.
+
+## Self-Check: PASSED
+
+Files exist:
+- FOUND: lib/services/msgraph-client.ts (modified)
+- FOUND: app/api/mobile/engagement/user/[userId]/photo/route.ts (created)
+
+Commits exist:
+- FOUND: 3f6b135 — feat(08-01): add getUserPhotoBytes() to MsGraphClient
+- FOUND: 4978780 — feat(08-01): add /api/mobile/engagement/user/[userId]/photo proxy route
+
+Type-check: PASSED (npx tsc --noEmit --pretty exits 0)
+Build: PASSED (npm run build exits 0)