fix: gallery download - use local URL for proxy, rename file with event name + photo date

backend/api/gallery.py

@@ -87,19 +87,35 @@ async def api_gallery_photos(
 
 @router.get("/api/gallery/download/{photo_id}")
 async def download_photo(request: Request, photo_id: str):
-    """Proxy la photo full-res avec un nom de fichier lie a l'evenement en cours."""
+    """Proxy la photo full-res avec Content-Disposition et nom basé sur l'événement + date photo."""
     pb = request.app.state.photobooth_service
     cfg = request.app.state.config
     event_svc = getattr(request.app.state, "event_service", None)
 
-    img_url = pb.media_url(photo_id)
+    # Toujours fetcher depuis localhost (base_url), pas l'URL publique
+    local_url = f"{pb._base.rstrip('/')}/media/full/{photo_id}"
+
+    # Nom de l'événement (lisible) + date de la photo depuis le disque
+    event_name = (cfg.event.name or cfg.event.slug or "Photomaton").replace(" ", "_")
     slug = cfg.event.slug or "photomaton"
-    date_str = datetime.now().strftime("%Y-%m-%d")
-    filename = f"{slug}_By_LSDW_{date_str}.jpg"
+
+    # Tenter de récupérer la vraie date depuis le fichier
+    photo_date = datetime.now().strftime("%Y-%m-%d_%H-%M")
+    try:
+        media_dir = Path(cfg.photobooth.media_dir)
+        candidates = list(media_dir.glob(f"{photo_id}*"))
+        if candidates:
+            mtime = candidates[0].stat().st_mtime
+            photo_date = datetime.fromtimestamp(mtime).strftime("%Y-%m-%d_%H-%M")
+    except Exception:
+        pass
+
+    safe_name = "".join(c if c.isalnum() or c in "-_." else "_" for c in event_name)
+    filename = f"{safe_name}_{photo_date}.jpg"
 
     try:
         async with httpx.AsyncClient(timeout=30.0) as client:
-            r = await client.get(img_url)
+            r = await client.get(local_url)
             r.raise_for_status()
 
         if event_svc:
@@ -116,8 +132,8 @@ async def download_photo(request: Request, photo_id: str):
             },
         )
     except Exception as e:
-        logger.warning("Download proxy echoue (%s), fallback redirect: %s", photo_id, e)
-        return RedirectResponse(url=img_url)
+        logger.warning("Download proxy échoue (%s): %s", photo_id, e)
+        return RedirectResponse(url=pb.media_url(photo_id))
 
 
 def _is_image(item: dict) -> bool: