trello-node-api/lib/MultipartDataGenerator.js

Trello Node API wrapper

'use strict';

var Buffer = require('safe-buffer').Buffer;

// Method for formatting HTTP body for the multipart/form-data specification
// Mostly taken from Fermata.js
// https://github.com/natevw/fermata/blob/5d9732a33d776ce925013a265935facd1626cc88/fermata.js#L315-L343
function multipartDataGenerator(method, data, headers) {
    var segno = (Math.round(Math.random() * 1e16) + Math.round(Math.random() * 1e16)).toString();
    headers['Content-Type'] = ('multipart/form-data; boundary=' + segno);
    var buffer = new Buffer(0);

    function push(l) {
        var prevBuffer = buffer;
        var newBuffer = (l instanceof Buffer) ? l : new Buffer(l);
        buffer = new Buffer(prevBuffer.length + newBuffer.length + 2);
        prevBuffer.copy(buffer);
        newBuffer.copy(buffer, prevBuffer.length);
        buffer.write('\r\n', buffer.length - 2);
    }

    function q(s) {
        return '"' + s.replace(/"|"/g, '%22').replace(/\r\n|\r|\n/g, ' ') + '"';
    }

    for (var k in data) {
        var v = data[k];
        push('--' + segno);
        if (v.hasOwnProperty('data')) {
            push('Content-Disposition: form-data; name=' + q(k) + '; filename=' + q(v.name || 'blob'));
            push('Content-Type: ' + (v.type || 'application/octet-stream'));
            push('');
            push(v.data);
        } else {
            push('Content-Disposition: form-data; name=' + q(k));
            push('');
            push(v);
        }
    }
    push('--' + segno + '--');

    return buffer;
}

module.exports = multipartDataGenerator;