first commit

handlers/download.go

@@ -0,0 +1,40 @@
+package handlers
+
+import (
+	"context"
+	"net/http"
+	"strconv"
+	"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 {
+			http.Error(w, "file not found or already downloaded", http.StatusNotFound)
+			return
+		}
+
+		// Delete from Redis now — one download only
+		defer st.Delete(ctx, key)
+
+		w.Header().Set("Content-Type", "video/mp4")
+		w.Header().Set("Content-Disposition", `attachment; filename="aroll-cut.mp4"`)
+		w.Header().Set("Content-Length", strconv.Itoa(len(data)))
+		w.Write(data)
+	}
+}