Jul 14 - Using CDN - Fix web CSP

CLAUDE.md

@@ -1396,6 +1396,7 @@ timeout = 30
 - Backward-compatible: empty URL arrays (older server) → resolver builds the `/static/` URL as before.
 
 **Operator cutover runbook (after 4b ships + Phase 3 sync exits clean):**
+- [ ] **CSP:** the web `img-src` must allow the R2 host or the browser blocks presigned image loads. Handled in `app/__init__.py` `set_security_headers` — the R2 endpoint host is derived from `R2_ENDPOINT_URL` and appended to `img-src` automatically when configured (local backend unaffected). If you use a custom R2 domain for presigned URLs, add that host too.
 - [ ] Confirm `python scripts/migrate_photos_to_r2.py` prints "✅ SAFE" (0 mismatches) and verified count ≥ Phase 0 baseline present-count.
 - [ ] Maintenance window: run the sync once more (delta) → set `STORAGE_BACKEND=s3` in `.env` → `systemctl restart janitorial-qc`.
 - [ ] Smoke test: existing web issue/inspection photos load; existing iPad issue photos load; a **new** upload from web and from iPad lands in R2 and renders; generate an inspection PDF + issue PDF with photos.

app/__init__.py

@@ -234,6 +234,18 @@ def create_app(config_name='default'):
     # ── Security response headers ─────────────────────────────────────────
     # Applied to every response. Blocks clickjacking, MIME sniffing, and
     # obvious XSS vectors without breaking Bootstrap CDN / Google Fonts.
+    # Allow R2 presigned photo URLs in the CSP img-src when the s3 storage
+    # backend is configured. Derived from R2_ENDPOINT_URL (the presigned URL
+    # host is the same R2 account endpoint), so nothing is hardcoded and the
+    # local backend is unaffected.
+    _r2_img_src = ''
+    _r2_endpoint = app.config.get('R2_ENDPOINT_URL')
+    if _r2_endpoint:
+        from urllib.parse import urlparse
+        _r2_host = urlparse(_r2_endpoint).netloc
+        if _r2_host:
+            _r2_img_src = f' https://{_r2_host}'
+
     @app.after_request
     def set_security_headers(response):
         response.headers.setdefault('X-Content-Type-Options', 'nosniff')
@@ -245,7 +257,7 @@ def create_app(config_name='default'):
             "script-src 'self' 'unsafe-inline' https://cdn.jsdelivr.net; "
             "style-src 'self' 'unsafe-inline' https://cdn.jsdelivr.net https://fonts.googleapis.com; "
             "font-src 'self' data: https://fonts.gstatic.com https://cdn.jsdelivr.net; "
-            "img-src 'self' data: blob: https://maps.gstatic.com https://maps.googleapis.com; "
+            f"img-src 'self' data: blob: https://maps.gstatic.com https://maps.googleapis.com{_r2_img_src}; "
             "connect-src 'self' https://cdn.jsdelivr.net; "
             "frame-src https://maps.google.com https://www.google.com; "
             "frame-ancestors 'none';"