fix: A16 — ACL sur l'export et les pièces jointes (v7.3.4)

- `export.py` : `_load_page_or_404(request, page_id)` — 401 sans session,
  404 si `PermissionManager.can_view_page` refuse (les 4 formats d'export)
- `dashboard.py` : helper `_require_page_view` sur `GET /api/pages/{id}/download`
  et `GET /api/pages/{id}/file-content`
- +1 test de non-régression → suite **1026/1026**, `ruff check app tests` OK

app/main.py

@@ -153,7 +153,7 @@ async def lifespan(_app: FastAPI):
 
 app = FastAPI(
     title="FlowDeck",
-    version="7.3.3",
+    version="7.3.4",
     docs_url="/docs",
     redoc_url="/redoc",
     lifespan=lifespan,

app/routers/dashboard.py

@@ -1158,9 +1158,21 @@ def _file_page_disk_path(page: dict):
     return (full, filename, mime, size)
 
 
+def _require_page_view(request: Request, page_id: int) -> None:
+    """A16 : lecture d'une pièce jointe = session + `can_view_page` (404 sinon)."""
+    user = SessionManager.decode_session(request.cookies.get("flowdeck_session", ""))
+    if not user or not user.get("id"):
+        raise HTTPException(401, "Authentication required")
+    from app.services.permission_manager import PermissionManager
+
+    if not PermissionManager(user["id"], bool(user.get("is_admin"))).can_view_page(page_id):
+        raise HTTPException(404, "Page not found")
+
+
 @router.get("/api/pages/{page_id}/download")
-async def download_page_file(page_id: int):
+async def download_page_file(request: Request, page_id: int):
     """Download the original uploaded file of a ``file`` page (attachment)."""
+    _require_page_view(request, page_id)
     with get_conn() as conn:
         row = conn.execute(
             "SELECT id, title, content, content_format FROM pages "
@@ -1181,13 +1193,15 @@ async def download_page_file(page_id: int):
 
 
 @router.get("/api/pages/{page_id}/file-content")
-async def page_file_content(page_id: int):
+async def page_file_content(request: Request, page_id: int):
     """Return the textual content of a ``file`` page (for copy to clipboard).
 
     Binary files (PDF, images…) answer ``{ok: false}`` — the clipboard copy is
     only meaningful for plain-text / code / markdown files.
     """
     from app.services.export import _file_text
+
+    _require_page_view(request, page_id)
     with get_conn() as conn:
         row = conn.execute(
             "SELECT id, title, content, content_format FROM pages "

app/routers/export.py

@@ -23,7 +23,15 @@ logger = logging.getLogger(__name__)
 router = APIRouter(tags=["export"], prefix="/api/export")
 
 
-def _load_page_or_404(page_id: int) -> dict:
+def _load_page_or_404(request: Request, page_id: int) -> dict:
+    """A16 : session obligatoire + `PermissionManager.can_view_page` — l'export ne
+    doit pas délivrer le contenu d'une page énumérable par id."""
+    from app.auth.session import SessionManager
+    from app.services.permission_manager import PermissionManager
+
+    user = SessionManager.decode_session(request.cookies.get("flowdeck_session", ""))
+    if not user or not user.get("id"):
+        raise HTTPException(status_code=401, detail="Authentication required")
     with get_conn() as conn:
         row = conn.execute(
             "SELECT * FROM pages WHERE id=? AND deleted_at IS NULL",
@@ -31,6 +39,8 @@ def _load_page_or_404(page_id: int) -> dict:
         ).fetchone()
     if not row:
         raise HTTPException(status_code=404, detail="Page not found")
+    if not PermissionManager(user["id"], bool(user.get("is_admin"))).can_view_page(page_id):
+        raise HTTPException(status_code=404, detail="Page not found")
     return dict(row)
 
 
@@ -52,7 +62,7 @@ def _safe_filename(page: dict, ext: str) -> str:
 
 @router.get("/markdown/{page_id}")
 async def export_markdown(page_id: int, request: Request):
-    page = _load_page_or_404(page_id)
+    page = _load_page_or_404(request, page_id)
     md = page_to_markdown(page)
     filename = _safe_filename(page, "md")
     headers = _download_header(filename, "text/markdown")
@@ -61,7 +71,7 @@ async def export_markdown(page_id: int, request: Request):
 
 @router.get("/html/{page_id}")
 async def export_html(page_id: int, request: Request):
-    page = _load_page_or_404(page_id)
+    page = _load_page_or_404(request, page_id)
     html = page_to_standalone_html(page)
     filename = _safe_filename(page, "html")
     headers = _download_header(filename, "text/html")
@@ -70,7 +80,7 @@ async def export_html(page_id: int, request: Request):
 
 @router.get("/pdf/{page_id}")
 async def export_pdf(page_id: int, request: Request):
-    page = _load_page_or_404(page_id)
+    page = _load_page_or_404(request, page_id)
     try:
         pdf_bytes = page_to_pdf_bytes(page)
     except ImportError:
@@ -85,7 +95,7 @@ async def export_pdf(page_id: int, request: Request):
 
 @router.get("/site/{page_id}")
 async def export_site(page_id: int, request: Request):
-    page = _load_page_or_404(page_id)
+    page = _load_page_or_404(request, page_id)
     site_bytes = build_static_site_bytes(page)
     title = _safe_filename(page, "site").replace(".site", "") or "flowdeck-site"
     filename = f"{title}_site.zip"