Feat: pptx and xlsx loader (#1118)

* perf: plan tip

* perf: upload size controller

* feat: add image ttl index

* feat: new upload file ux

* remove file

* feat: support read pptx

* feat: support xlsx

* fix: rerank docker flie

projects/app/src/pages/api/common/file/previewContent.ts

@@ -0,0 +1,41 @@
+/* 
+    Read db file content and response 3000 words
+*/
+import type { NextApiRequest, NextApiResponse } from 'next';
+import { jsonRes } from '@fastgpt/service/common/response';
+import { connectToDatabase } from '@/service/mongo';
+import { readFileContent } from '@fastgpt/service/common/file/gridfs/controller';
+import { authFile } from '@fastgpt/service/support/permission/auth/file';
+import { BucketNameEnum } from '@fastgpt/global/common/file/constants';
+
+export default async function handler(req: NextApiRequest, res: NextApiResponse<any>) {
+  try {
+    await connectToDatabase();
+    const { fileId, csvFormat } = req.body as { fileId: string; csvFormat?: boolean };
+
+    if (!fileId) {
+      throw new Error('fileId is empty');
+    }
+
+    const { teamId } = await authFile({ req, authToken: true, fileId });
+
+    const { rawText } = await readFileContent({
+      teamId,
+      bucketName: BucketNameEnum.dataset,
+      fileId,
+      csvFormat
+    });
+
+    jsonRes(res, {
+      data: {
+        previewContent: rawText.slice(0, 3000),
+        totalLength: rawText.length
+      }
+    });
+  } catch (error) {
+    jsonRes(res, {
+      code: 500,
+      error
+    });
+  }
+}