gristlabs_grist-core/app/server/serverMethods.ts

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import * as gutil from 'app/common/gutil';
import { SortFunc } from "app/common/SortFunc";
import { docSessionFromRequest } from "app/server/lib/DocSession";
import * as bluebird from "bluebird";
import * as contentDisposition from "content-disposition";
import * as csv from "csv";
import * as log from "./lib/log";
import { ServerColumnGetters } from "./lib/ServerColumnGetters";
import * as _ from "underscore";
import * as express from "express";
import * as Comm from 'app/server/lib/Comm';
import { ActiveDoc } from "app/server/lib/ActiveDoc";
import { createFormatter } from "app/common/ValueFormatter";
import { SchemaTypes } from "app/common/schema";
import { RequestWithLogin } from "app/server/lib/Authorizer";
import { RowRecord } from "app/common/DocActions";
import { buildColFilter } from "app/common/ColumnFilterFunc";
import { buildRowFilter } from "app/common/RowFilterFunc";
// promisify csv
bluebird.promisifyAll(csv);
export async function generateCSV(req: express.Request, res: express.Response, comm: Comm) {
log.info('Generating .csv file...');
// Get the current table id
const tableId = req.param('tableId');
const viewSectionId = parseInt(req.param('viewSection'), 10);
const activeSortOrder = gutil.safeJsonParse(req.param('activeSortSpec'), null);
const filters: Filter[] = gutil.safeJsonParse(req.param("filters"), []) || [];
// Get the active doc
const clientId = req.param('clientId');
const docFD = parseInt(req.param('docFD'), 10);
const client = comm.getClient(clientId);
const docSession = client.getDocSession(docFD);
const activeDoc = docSession.activeDoc;
// Generate a decent name for the exported file.
const docName = req.query.title || activeDoc.docName;
const name = docName +
(tableId === docName ? '' : '-' + tableId) + '.csv';
try {
const data = await makeCSV(activeDoc, viewSectionId, activeSortOrder, filters, req);
res.set('Content-Type', 'text/csv');
res.setHeader('Content-Disposition', contentDisposition(name));
res.send(data);
} catch (err) {
log.error("Exporting to CSV has failed. Request url: %s", req.url, err);
// send a generic information to client
const errHtml =
`<!doctype html>
<html>
<body>There was an unexpected error while generating a csv file.</body>
</html>
`;
res.status(400).send(errHtml);
}
}
/**
* Returns a csv stream 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.
* @return {Promise<string>} Promise for the resulting CSV.
*/
export async function makeCSV(
activeDoc: ActiveDoc,
viewSectionId: number,
sortOrder: number[],
filters: Filter[],
req: express.Request) {
const {
table,
viewSection,
tableColumns,
fields
} = explodeSafe(activeDoc, viewSectionId);
const tableColsById = _.indexBy(tableColumns, 'id');
// Produce a column description matching what user will see / expect to export
const viewify = (col: GristTablesColumn, field: GristViewsSectionField) => {
field = field || {};
const displayCol = tableColsById[field.displayCol || col.displayCol || col.id];
const colWidgetOptions = gutil.safeJsonParse(col.widgetOptions, {});
const fieldWidgetOptions = gutil.safeJsonParse(field.widgetOptions, {});
const filterFunc = buildColFilter(filters.find(x => x.colRef === field.colRef)?.filter, col.type);
return {
id: displayCol.id,
colId: displayCol.colId,
label: col.label,
colType: col.type,
filterFunc,
widgetOptions: Object.assign(colWidgetOptions, fieldWidgetOptions)
};
};
const viewColumns = _.sortBy(fields, 'parentPos').map(
(field) => viewify(tableColsById[field.colRef], field));
// The columns named in sort order need to now become display columns
sortOrder = sortOrder || gutil.safeJsonParse(viewSection.sortColRefs, []);
const fieldsByColRef = _.indexBy(fields, 'colRef');
sortOrder = sortOrder.map((directionalColRef) => {
const colRef = Math.abs(directionalColRef);
const col = tableColsById[colRef];
if (!col) {
return 0;
}
const effectiveColRef = viewify(col, fieldsByColRef[colRef]).id;
return directionalColRef > 0 ? effectiveColRef : -effectiveColRef;
});
const data = await activeDoc.fetchTable(docSessionFromRequest(req as RequestWithLogin), table.tableId, true);
const rowIds = data[2];
const dataByColId = data[3];
const getters = new ServerColumnGetters(rowIds, dataByColId, tableColumns);
const sorter = new SortFunc(getters);
sorter.updateSpec(sortOrder);
rowIds.sort((a, b) => sorter.compare(a, b));
const formatters = viewColumns.map(col =>
createFormatter(col.colType, col.widgetOptions));
// Arrange the data into a row-indexed matrix, starting with column headers.
const csvMatrix = [viewColumns.map(col => col.label)];
const access = viewColumns.map(col => getters.getColGetter(col.id));
// create row filter based on all columns filter
const rowFilter = viewColumns
.map((col, c) => buildRowFilter(access[c], col.filterFunc))
.reduce((prevFilter, curFilter) => (id) => prevFilter(id) && curFilter(id), () => true);
rowIds.forEach(row => {
if (!rowFilter(row)) {
return;
}
csvMatrix.push(access.map((getter, c) => formatters[c].formatAny(getter!(row))));
});
return csv.stringifyAsync(csvMatrix);
}
// helper method that retrieves various parts about view section
// from ActiveDoc
function explodeSafe(activeDoc: ActiveDoc, viewSectionId: number) {
const docData = activeDoc.docData;
if (!docData) {
// Should not happen unless there's a logic error
// This method is exported (for testing) so it is possible
// to call it without loading active doc first
throw new Error("Document hasn't been loaded yet");
}
const viewSection = docData
.getTable('_grist_Views_section')
?.getRecord(viewSectionId) as GristViewsSection | undefined;
if (!viewSection) {
throw new Error(`No table '_grist_Views_section' in document with id ${activeDoc.docName}`);
}
const table = docData
.getTable('_grist_Tables')
?.getRecord(viewSection.tableRef) as GristTables | undefined;
if (!table) {
throw new Error(`No table '_grist_Tables' in document with id ${activeDoc.docName}`);
}
const fields = docData
.getTable('_grist_Views_section_field')
?.filterRecords({ parentId: viewSection.id }) as GristViewsSectionField[] | undefined;
if (!fields) {
throw new Error(`No table '_grist_Views_section_field' in document with id ${activeDoc.docName}`);
}
const tableColumns = docData
.getTable('_grist_Tables_column')
?.filterRecords({ parentId: table.id }) as GristTablesColumn[] | undefined;
if (!tableColumns) {
throw new Error(`No table '_grist_Tables_column' in document with id ${activeDoc.docName}`);
}
return {
table,
fields,
tableColumns,
viewSection
};
}
// Type helpers for types used in this export
type RowModel<TName extends keyof SchemaTypes> = RowRecord & {
[ColId in keyof SchemaTypes[TName]]: SchemaTypes[TName][ColId];
};
type GristViewsSection = RowModel<'_grist_Views_section'>
type GristTables = RowModel<'_grist_Tables'>
type GristViewsSectionField = RowModel<'_grist_Views_section_field'>
type GristTablesColumn = RowModel<'_grist_Tables_column'>
// Type for filters passed from the client
interface Filter { colRef: number, filter: string }