feat: support local storage

app/api/langchain-tools/dalle_image_generator_node.ts

@@ -0,0 +1,22 @@
+import { getServerSideConfig } from "@/app/config/server";
+import { DallEAPIWrapper } from "./dalle_image_generator";
+import S3FileStorage from "@/app/utils/s3_file_storage";
+import LocalFileStorage from "@/app/utils/local_file_storage";
+
+export class DallEAPINodeWrapper extends DallEAPIWrapper {
+  async saveImageFromUrl(url: string) {
+    const response = await fetch(url);
+    const content = await response.arrayBuffer();
+    const buffer = Buffer.from(content);
+
+    var filePath = "";
+    const serverConfig = getServerSideConfig();
+    var fileName = `${Date.now()}.png`;
+    if (serverConfig.isStoreFileToLocal) {
+      filePath = await LocalFileStorage.put(fileName, buffer);
+    } else {
+      filePath = await S3FileStorage.put(fileName, buffer);
+    }
+    return filePath;
+  }
+}