55 lines
1.9 KiB
JavaScript
55 lines
1.9 KiB
JavaScript
/* sheetjs (C) 2013-present SheetJS -- http://sheetjs.com */
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'use strict';
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var XLSX = require('xlsx');
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var Busboy = require('busboy');
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exports.handler = function(event, context, callback) {
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if(event.requestContext.http.method == "GET") {
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/* make workbook */
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var wb = XLSX.read("S,h,e,e,t,J,S\n5,4,3,3,7,9,5", {type: "binary"});
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/* write to XLSX file in Base64 encoding */
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var body = XLSX.write(wb, {type:"base64", bookType: "xlsx"});
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/* mark as attached file */
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var headers = { "Content-Disposition": 'attachment; filename="SheetJSLambda.xlsx"'};
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/* Send back data */
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callback(null, {
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statusCode: 200,
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isBase64Encoded: true,
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body: body,
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headers: headers
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});
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return;
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}
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/* set up busboy */
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var ctype = event.headers['Content-Type']||event.headers['content-type'];
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var bb = Busboy({headers:{'content-type':ctype}});
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/* busboy is evented; accumulate the fields and files manually */
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var fields = {}, files = {};
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bb.on('error', function(err) { callback(null, { body: err.message }); });
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bb.on('field', function(fieldname, val) {fields[fieldname] = val });
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bb.on('file', function(fieldname, file, filename) {
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/* concatenate the individual data buffers */
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var buffers = [];
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file.on('data', function(data) { buffers.push(data); });
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file.on('end', function() { files[fieldname] = [Buffer.concat(buffers), filename]; });
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});
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/* on the finish event, all of the fields and files are ready */
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bb.on('finish', function() {
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/* grab the first file */
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var f = files["upload"];
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if(!f) callback(new Error("Must submit a file for processing!"));
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/* f[0] is a buffer */
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var wb = XLSX.read(f[0]);
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/* grab first worksheet and convert to CSV */
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var ws = wb.Sheets[wb.SheetNames[0]];
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callback(null, { statusCode: 200, body: XLSX.utils.sheet_to_csv(ws) });
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});
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bb.end(Buffer.from(event.body, "base64"));
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};
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