feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

frontend/packages/data/memory/database-v2-base/src/utils/get-base64.ts

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2025 coze-dev Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+ 
+import { REPORT_EVENTS as ReportEventNames } from '@coze-arch/report-events';
+import { CustomError } from '@coze-arch/bot-error';
+
+export const getBase64 = (file: Blob): Promise<string> =>
+  new Promise((resolve, reject) => {
+    const fileReader = new FileReader();
+    fileReader.onload = event => {
+      const result = event.target?.result;
+      if (!result || typeof result !== 'string') {
+        reject(
+          new CustomError(ReportEventNames.parmasValidation, 'file read fail'),
+        );
+        return;
+      }
+      resolve(result.replace(/^.*?,/, ''));
+    };
+    fileReader.readAsDataURL(file);
+  });

frontend/packages/data/memory/database-v2-base/src/utils/get-file-extension.ts

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2025 coze-dev Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+ 
+export const getFileExtension = (name: string) => {
+  const index = name.lastIndexOf('.');
+  return name.slice(index + 1);
+};