first successful export

handlers/download.go

@@ -1,40 +1,38 @@
 package handlers
 
 import (
-	"context"
 	"net/http"
-	"strconv"
+	"os"
 	"strings"
 
 	"aroll/store"
 )
 
-// DownloadHandler fetches the exported video from Redis, streams it to the
-// browser, then immediately deletes the key. One download per export.
 func DownloadHandler(st *store.Store) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		key := strings.TrimPrefix(r.URL.Path, "/")
 
-		// Only serve keys we created in ExportHandler
 		if !strings.HasPrefix(key, "output-") {
 			http.NotFound(w, r)
 			return
 		}
 
-		ctx := context.Background()
-
-		data, err := st.Get(ctx, key)
-		if err != nil {
+		path, ok := st.Path(key)
+		if !ok {
 			http.Error(w, "file not found or already downloaded", http.StatusNotFound)
 			return
 		}
+		defer st.Delete(key)
 
-		// Delete from Redis now — one download only
-		defer st.Delete(ctx, key)
+		f, err := os.Open(path)
+		if err != nil {
+			http.Error(w, "file not found", http.StatusNotFound)
+			return
+		}
+		defer f.Close()
 
-		w.Header().Set("Content-Type", "video/mp4")
+		fi, _ := f.Stat()
 		w.Header().Set("Content-Disposition", `attachment; filename="aroll-cut.mp4"`)
-		w.Header().Set("Content-Length", strconv.Itoa(len(data)))
-		w.Write(data)
+		http.ServeContent(w, r, "aroll-cut.mp4", fi.ModTime(), f)
 	}
 }