41 lines
1.5 KiB
JavaScript
41 lines
1.5 KiB
JavaScript
/* xlsx.js (C) 2013-present SheetJS -- http://sheetjs.com */
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/* eslint-env node */
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// base64 sheetjs.xlsb | curl -F "data=@-;filename=test.xlsb" http://localhost:3000/LambdaProxy
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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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/* set up busboy */
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var ctype = event.headers['Content-Type']||event.headers['content-type'];
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var bb = new 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) { console.log('err', err); callback(err); });
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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[Object.keys(files)[0]];
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if(!f) callback(new Error("Must submit a file for processing!"));
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/* f[0] is a buffer, convert to string and interpret as Base64 */
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var wb = XLSX.read(f[0].toString(), {type:"base64"});
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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, { body: XLSX.utils.sheet_to_csv(ws) });
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});
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bb.end(event.body);
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};
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