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