fix(export): include excalidraw source/version metadata

backend/src/index.ts

@@ -1376,8 +1376,7 @@ app.get("/export/json", requireAuth, asyncHandler(async (req, res, next) => {
   res.setHeader("Content-Type", "application/zip");
   res.setHeader(
     "Content-Disposition",
-      `attachment; filename="excalidraw-drawings-${new Date().toISOString().split("T")[0]
-      }.zip"`
+    `attachment; filename="excalidraw-drawings-${new Date().toISOString().split("T")[0]}.zip"`,
   );
 
   const archive = archiver("zip", { zlib: { level: 9 } });
@@ -1396,6 +1395,9 @@ app.get("/export/json", requireAuth, asyncHandler(async (req, res, next) => {
   type DrawingExportItem = {
     name: string;
     data: {
+      type: "excalidraw";
+      version: 2;
+      source: string;
       elements: unknown[];
       appState: Record<string, unknown>;
       files: Record<string, unknown>;
@@ -1403,6 +1405,7 @@ app.get("/export/json", requireAuth, asyncHandler(async (req, res, next) => {
   };
 
   const drawingsByCollection: Record<string, DrawingExportItem[]> = {};
+  const exportSource = `${req.protocol}://${req.get("host")}`;
 
   drawings.forEach((drawing: DrawingWithCollection) => {
     const collectionName = drawing.collection?.name || "Unorganized";
@@ -1411,6 +1414,9 @@ app.get("/export/json", requireAuth, asyncHandler(async (req, res, next) => {
     }
 
     const drawingData = {
+      type: "excalidraw" as const,
+      version: 2 as const,
+      source: exportSource,
       elements: JSON.parse(drawing.elements) as unknown[],
       appState: JSON.parse(drawing.appState) as Record<string, unknown>,
       files: JSON.parse(drawing.files || "{}") as Record<string, unknown>,
@@ -1425,18 +1431,15 @@ app.get("/export/json", requireAuth, asyncHandler(async (req, res, next) => {
   Object.entries(drawingsByCollection).forEach(
     ([collectionName, collectionDrawings]) => {
       const folderName = collectionName.replace(/[<>:"/\\|?*]/g, "_");
-        collectionDrawings.forEach((drawing, index) => {
-          const fileName = `${drawing.name.replace(
-            /[<>:"/\\|?*]/g,
-            "_"
-          )}.excalidraw`;
+      collectionDrawings.forEach((drawing) => {
+        const fileName = `${drawing.name.replace(/[<>:"/\\|?*]/g, "_")}.excalidraw`;
         const filePath = `${folderName}/${fileName}`;
 
         archive.append(JSON.stringify(drawing.data, null, 2), {
           name: filePath,
         });
       });
-      }
+    },
   );
 
   const readmeContent = `ExcaliDash Export