node-formidable、 browserify 、および polyfillを使用することをお勧めします。これはスタンドアロンのパーサーで、文字列と生の応答の両方で動作します。生のものには最新のブラウザを使用していることを確認してください。
/*
* MultiPart_parse decodes a multipart/form-data encoded response into a named-part-map.
* The response can be a string or raw bytes.
*
* Usage for string response:
* var map = MultiPart_parse(xhr.responseText, xhr.getResponseHeader('Content-Type'));
*
* Usage for raw bytes:
* xhr.open(..);
* xhr.responseType = "arraybuffer";
* ...
* var map = MultiPart_parse(xhr.response, xhr.getResponseHeader('Content-Type'));
*
* TODO: Can we use https://github.com/felixge/node-formidable
* See http://stackoverflow.com/questions/6965107/converting-between-strings-and-arraybuffers
* See http://www.w3.org/Protocols/rfc1341/7_2_Multipart.html
*
* Copyright@ 2013-2014 Wolfgang Kuehn, released under the MIT license.
*/
function MultiPart_parse(body, contentType) {
// Examples for content types:
// multipart/form-data; boundary="----7dd322351017c"; ...
// multipart/form-data; boundary=----7dd322351017c; ...
var m = contentType.match(/boundary=(?:"([^"]+)"|([^;]+))/i);
if ( !m ) {
throw new Error('Bad content-type header, no multipart boundary');
}
var boundary = m[1] || m[2];
function Header_parse(header) {
var headerFields = {};
var matchResult = header.match(/^.*name="([^"]*)"$/);
if ( matchResult ) headerFields.name = matchResult[1];
return headerFields;
}
function rawStringToBuffer( str ) {
var idx, len = str.length, arr = new Array( len );
for ( idx = 0 ; idx < len ; ++idx ) {
arr[ idx ] = str.charCodeAt(idx) & 0xFF;
}
return new Uint8Array( arr ).buffer;
}
// \r\n is part of the boundary.
var boundary = '\r\n--' + boundary;
var isRaw = typeof(body) !== 'string';
if ( isRaw ) {
var view = new Uint8Array( body );
s = String.fromCharCode.apply(null, view);
} else {
s = body;
}
// Prepend what has been stripped by the body parsing mechanism.
s = '\r\n' + s;
var parts = s.split(new RegExp(boundary)),
partsByName = {};
// First part is a preamble, last part is closing '--'
for (var i=1; i<parts.length-1; i++) {
var subparts = parts[i].split('\r\n\r\n');
var headers = subparts[0].split('\r\n');
for (var j=1; j<headers.length; j++) {
var headerFields = Header_parse(headers[j]);
if ( headerFields.name ) {
fieldName = headerFields.name;
}
}
partsByName[fieldName] = isRaw?rawStringToBuffer(subparts[1]):subparts[1];
}
return partsByName;
}