gristlabs_grist-core/app/server/lib/ExportCSV.ts

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import {ApiError} from 'app/common/ApiError';
import {createFormatter} from 'app/common/ValueFormatter';
import {ActiveDoc} from 'app/server/lib/ActiveDoc';
import {ExportData, exportSection, exportTable, Filter, DownloadOptions} from 'app/server/lib/Export';
import log from 'app/server/lib/log';
import * as bluebird from 'bluebird';
import contentDisposition from 'content-disposition';
import csv from 'csv';
import * as express from 'express';
// promisify csv
bluebird.promisifyAll(csv);
/**
* Converts `activeDoc` to a CSV and sends the converted data through `res`.
*/
export async function downloadCSV(activeDoc: ActiveDoc, req: express.Request,
res: express.Response, options: DownloadOptions) {
log.info('Generating .csv file...');
const {filename, tableId, viewSectionId, filters, sortOrder} = options;
const data = viewSectionId ?
await makeCSVFromViewSection(activeDoc, viewSectionId, sortOrder, filters, req) :
await makeCSVFromTable(activeDoc, tableId, req);
res.set('Content-Type', 'text/csv');
res.setHeader('Content-Disposition', contentDisposition(filename + '.csv'));
res.send(data);
}
/**
* Returns a csv stream of a view section that can be transformed or parsed.
*
* See https://github.com/wdavidw/node-csv for API details.
*
* @param {Object} activeDoc - the activeDoc that the table being converted belongs to.
* @param {Integer} viewSectionId - id of the viewsection to export.
* @param {Integer[]} activeSortOrder (optional) - overriding sort order.
* @param {Filter[]} filters (optional) - filters defined from ui.
* @return {Promise<string>} Promise for the resulting CSV.
*/
export async function makeCSVFromViewSection(
activeDoc: ActiveDoc,
viewSectionId: number,
sortOrder: number[],
filters: Filter[],
req: express.Request) {
const data = await exportSection(activeDoc, viewSectionId, sortOrder, filters, req);
const file = convertToCsv(data);
return file;
}
/**
* Returns a csv stream of a table that can be transformed or parsed.
*
* @param {Object} activeDoc - the activeDoc that the table being converted belongs to.
* @param {Integer} tableId - id of the table to export.
* @return {Promise<string>} Promise for the resulting CSV.
*/
export async function makeCSVFromTable(
activeDoc: ActiveDoc,
tableId: string,
req: express.Request) {
if (!activeDoc.docData) {
throw new Error('No docData in active document');
}
// Look up the table to make a CSV from.
const tables = activeDoc.docData.getMetaTable('_grist_Tables');
const tableRef = tables.findRow('tableId', tableId);
if (tableRef === 0) {
throw new ApiError(`Table ${tableId} not found.`, 404);
}
const data = await exportTable(activeDoc, tableRef, req);
const file = convertToCsv(data);
return file;
}
function convertToCsv({
rowIds,
access,
columns: viewColumns,
docSettings
}: ExportData) {
// create formatters for columns
const formatters = viewColumns.map(col => createFormatter(col.type, col.widgetOptions, docSettings));
// Arrange the data into a row-indexed matrix, starting with column headers.
const csvMatrix = [viewColumns.map(col => col.label)];
// populate all the rows with values as strings
rowIds.forEach(row => {
csvMatrix.push(access.map((getter, c) => formatters[c].formatAny(getter(row))));
});
return csv.stringifyAsync(csvMatrix);
}