gristlabs_grist-core/app/server/lib/GoogleExport.ts
2023-09-05 14:27:35 -04:00

82 lines
2.9 KiB
TypeScript

import {drive} from '@googleapis/drive';
import {ActiveDoc} from 'app/server/lib/ActiveDoc';
import {RequestWithLogin} from 'app/server/lib/Authorizer';
import {streamXLSX} from 'app/server/lib/ExportXLSX';
import log from 'app/server/lib/log';
import {optStringParam} from 'app/server/lib/requestUtils';
import {Request, Response} from 'express';
import {PassThrough, Stream} from 'stream';
/**
* Endpoint logic for sending grist document to Google Drive. Grist document is first exported as an
* excel file and then pushed to Google Drive as a Google Spreadsheet.
*/
export async function exportToDrive(
activeDoc: ActiveDoc,
req: Request,
res: Response
) {
// Token should come from auth middleware
const access_token = optStringParam(req.query.access_token, 'access_token');
if (!access_token) {
throw new Error("No access token - Can't send file to Google Drive");
}
const mreq = req as RequestWithLogin;
const meta = {
docId: activeDoc.docName,
userId: mreq.userId,
altSessionId: mreq.altSessionId,
};
// Prepare file for exporting.
log.debug(`Export to drive - Preparing file for export`, meta);
const name = (optStringParam(req.query.title, 'title') || activeDoc.docName);
const stream = new PassThrough();
try {
// Send file to GDrive and get the url for a preview.
const [, url] = await Promise.all([
streamXLSX(activeDoc, req, stream, {tableId: ''}),
sendFileToDrive(name, stream, access_token),
]);
log.debug(`Export to drive - File exported, redirecting to Google Spreadsheet ${url}`, meta);
res.json({ url });
} catch (err) {
log.error("Export to drive - Error while sending file to GDrive", meta, err);
// Test if google returned a valid error message.
if (err.errors && err.errors.length) {
throw new Error(err.errors[0].message);
} else {
throw err;
}
}
}
// Creates spreadsheet file in a Google drive, by sending an excel and requesting for conversion.
async function sendFileToDrive(fileNameNoExt: string, stream: Stream, oauth_token: string): Promise<string> {
// Here we are asking google drive to convert excel file to a google spreadsheet
const requestBody = {
// name of the spreadsheet to create
name: fileNameNoExt,
// mime type of the google spreadsheet
mimeType: 'application/vnd.google-apps.spreadsheet'
};
// Define what gets send - excel file
const media = {
mimeType: 'application/vnd.ms-excel',
body: stream
};
const googleDrive = drive("v3");
const fileRes = await googleDrive.files.create({
requestBody, // what to do with file - convert to spreadsheet
oauth_token, // access token
media, // file
fields: "webViewLink" // return webViewLink after creating file
});
const url = fileRes.data.webViewLink;
if (!url) {
throw new Error("Google Api has not returned valid response");
}
return url;
}