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var CombinedStream = require('combined-stream');
var util = require('util');
var path = require('path');
var http = require('http');
var https = require('https');
var parseUrl = require('url').parse;
var fs = require('fs');
var mime = require('mime-types');
var asynckit = require('asynckit');
var populate = require('./populate.js');
// Public API
module.exports = FormData;
// make it a Stream
util.inherits(FormData, CombinedStream);
/**
* Create readable "multipart/form-data" streams.
* Can be used to submit forms
* and file uploads to other web applications.
*
* @constructor
* @param {Object} options - Properties to be added/overriden for FormData and CombinedStream
*/
function FormData(options) {
if (!(this instanceof FormData)) {
return new FormData();
}
this._overheadLength = 0;
this._valueLength = 0;
this._valuesToMeasure = [];
CombinedStream.call(this);
options = options || {};
for (var option in options) {
this[option] = options[option];
}
}
FormData.LINE_BREAK = '\r\n';
FormData.DEFAULT_CONTENT_TYPE = 'application/octet-stream';
FormData.prototype.append = function(field, value, options) {
options = options || {};
// allow filename as single option
if (typeof options == 'string') {
options = {filename: options};
}
var append = CombinedStream.prototype.append.bind(this);
// all that streamy business can't handle numbers
if (typeof value == 'number') {
value = '' + value;
}
// https://github.com/felixge/node-form-data/issues/38
if (util.isArray(value)) {
// Please convert your array into string
// the way web server expects it
this._error(new Error('Arrays are not supported.'));
return;
}
var header = this._multiPartHeader(field, value, options);
var footer = this._multiPartFooter();
append(header);
append(value);
append(footer);
// pass along options.knownLength
this._trackLength(header, value, options);
};
FormData.prototype._trackLength = function(header, value, options) {
var valueLength = 0;
// used w/ getLengthSync(), when length is known.
// e.g. for streaming directly from a remote server,
// w/ a known file a size, and not wanting to wait for
// incoming file to finish to get its size.
if (options.knownLength != null) {
valueLength += +options.knownLength;
} else if (Buffer.isBuffer(value)) {
valueLength = value.length;
} else if (typeof value === 'string') {
valueLength = Buffer.byteLength(value);
}
this._valueLength += valueLength;
// @check why add CRLF? does this account for custom/multiple CRLFs?
this._overheadLength +=
Buffer.byteLength(header) +
FormData.LINE_BREAK.length;
// empty or either doesn't have path or not an http response
if (!value || ( !value.path && !(value.readable && value.hasOwnProperty('httpVersion')) )) {
return;
}
// no need to bother with the length
if (!options.knownLength) {
this._valuesToMeasure.push(value);
}
};
FormData.prototype._lengthRetriever = function(value, callback) {
if (value.hasOwnProperty('fd')) {
// take read range into a account
// `end` = Infinity –> read file till the end
//
// TODO: Looks like there is bug in Node fs.createReadStream
// it doesn't respect `end` options without `start` options
// Fix it when node fixes it.
// https://github.com/joyent/node/issues/7819
if (value.end != undefined && value.end != Infinity && value.start != undefined) {
// when end specified
// no need to calculate range
// inclusive, starts with 0
callback(null, value.end + 1 - (value.start ? value.start : 0));
// not that fast snoopy
} else {
// still need to fetch file size from fs
fs.stat(value.path, function(err, stat) {
var fileSize;
if (err) {
callback(err);
return;
}
// update final size based on the range options
fileSize = stat.size - (value.start ? value.start : 0);
callback(null, fileSize);
});
}
// or http response
} else if (value.hasOwnProperty('httpVersion')) {
callback(null, +value.headers['content-length']);
// or request stream http://github.com/mikeal/request
} else if (value.hasOwnProperty('httpModule')) {
// wait till response come back
value.on('response', function(response) {
value.pause();
callback(null, +response.headers['content-length']);
});
value.resume();
// something else
} else {
callback('Unknown stream');
}
};
FormData.prototype._multiPartHeader = function(field, value, options) {
// custom header specified (as string)?
// it becomes responsible for boundary
// (e.g. to handle extra CRLFs on .NET servers)
if (typeof options.header == 'string') {
return options.header;
}
var contentDisposition = this._getContentDisposition(value, options);
var contentType = this._getContentType(value, options);
var contents = '';
var headers = {
// add custom disposition as third element or keep it two elements if not
'Content-Disposition': ['form-data', 'name="' + field + '"'].concat(contentDisposition || []),
// if no content type. allow it to be empty array
'Content-Type': [].concat(contentType || [])
};
// allow custom headers.
if (typeof options.header == 'object') {
populate(headers, options.header);
}
var header;
for (var prop in headers) {
if (!headers.hasOwnProperty(prop)) continue;
header = headers[prop];
// skip nullish headers.
if (header == null) {
continue;
}
// convert all headers to arrays.
if (!Array.isArray(header)) {
header = [header];
}
// add non-empty headers.
if (header.length) {
contents += prop + ': ' + header.join('; ') + FormData.LINE_BREAK;
}
}
return '--' + this.getBoundary() + FormData.LINE_BREAK + contents + FormData.LINE_BREAK;
};
FormData.prototype._getContentDisposition = function(value, options) {
var filename
, contentDisposition
;
if (typeof options.filepath === 'string') {
// custom filepath for relative paths
filename = path.normalize(options.filepath).replace(/\\/g, '/');
} else if (options.filename || value.name || value.path) {
// custom filename take precedence
// formidable and the browser add a name property
// fs- and request- streams have path property
filename = path.basename(options.filename || value.name || value.path);
} else if (value.readable && value.hasOwnProperty('httpVersion')) {
// or try http response
filename = path.basename(value.client._httpMessage.path);
}
if (filename) {
contentDisposition = 'filename="' + filename + '"';
}
return contentDisposition;
};
FormData.prototype._getContentType = function(value, options) {
// use custom content-type above all
var contentType = options.contentType;
// or try `name` from formidable, browser
if (!contentType && value.name) {
contentType = mime.lookup(value.name);
}
// or try `path` from fs-, request- streams
if (!contentType && value.path) {
contentType = mime.lookup(value.path);
}
// or if it's http-reponse
if (!contentType && value.readable && value.hasOwnProperty('httpVersion')) {
contentType = value.headers['content-type'];
}
// or guess it from the filepath or filename
if (!contentType && (options.filepath || options.filename)) {
contentType = mime.lookup(options.filepath || options.filename);
}
// fallback to the default content type if `value` is not simple value
if (!contentType && typeof value == 'object') {
contentType = FormData.DEFAULT_CONTENT_TYPE;
}
return contentType;
};
FormData.prototype._multiPartFooter = function() {
return function(next) {
var footer = FormData.LINE_BREAK;
var lastPart = (this._streams.length === 0);
if (lastPart) {
footer += this._lastBoundary();
}
next(footer);
}.bind(this);
};
FormData.prototype._lastBoundary = function() {
return '--' + this.getBoundary() + '--' + FormData.LINE_BREAK;
};
FormData.prototype.getHeaders = function(userHeaders) {
var header;
var formHeaders = {
'content-type': 'multipart/form-data; boundary=' + this.getBoundary()
};
for (header in userHeaders) {
if (userHeaders.hasOwnProperty(header)) {
formHeaders[header.toLowerCase()] = userHeaders[header];
}
}
return formHeaders;
};
FormData.prototype.getBoundary = function() {
if (!this._boundary) {
this._generateBoundary();
}
return this._boundary;
};
FormData.prototype._generateBoundary = function() {
// This generates a 50 character boundary similar to those used by Firefox.
// They are optimized for boyer-moore parsing.
var boundary = '--------------------------';
for (var i = 0; i < 24; i++) {
boundary += Math.floor(Math.random() * 10).toString(16);
}
this._boundary = boundary;
};
// Note: getLengthSync DOESN'T calculate streams length
// As workaround one can calculate file size manually
// and add it as knownLength option
FormData.prototype.getLengthSync = function() {
var knownLength = this._overheadLength + this._valueLength;
// Don't get confused, there are 3 "internal" streams for each keyval pair
// so it basically checks if there is any value added to the form
if (this._streams.length) {
knownLength += this._lastBoundary().length;
}
// https://github.com/form-data/form-data/issues/40
if (!this.hasKnownLength()) {
// Some async length retrievers are present
// therefore synchronous length calculation is false.
// Please use getLength(callback) to get proper length
this._error(new Error('Cannot calculate proper length in synchronous way.'));
}
return knownLength;
};
// Public API to check if length of added values is known
// https://github.com/form-data/form-data/issues/196
// https://github.com/form-data/form-data/issues/262
FormData.prototype.hasKnownLength = function() {
var hasKnownLength = true;
if (this._valuesToMeasure.length) {
hasKnownLength = false;
}
return hasKnownLength;
};
FormData.prototype.getLength = function(cb) {
var knownLength = this._overheadLength + this._valueLength;
if (this._streams.length) {
knownLength += this._lastBoundary().length;
}
if (!this._valuesToMeasure.length) {
process.nextTick(cb.bind(this, null, knownLength));
return;
}
asynckit.parallel(this._valuesToMeasure, this._lengthRetriever, function(err, values) {
if (err) {
cb(err);
return;
}
values.forEach(function(length) {
knownLength += length;
});
cb(null, knownLength);
});
};
FormData.prototype.submit = function(params, cb) {
var request
, options
, defaults = {method: 'post'}
;
// parse provided url if it's string
// or treat it as options object
if (typeof params == 'string') {
params = parseUrl(params);
options = populate({
port: params.port,
path: params.pathname,
host: params.hostname,
protocol: params.protocol
}, defaults);
// use custom params
} else {
options = populate(params, defaults);
// if no port provided use default one
if (!options.port) {
options.port = options.protocol == 'https:' ? 443 : 80;
}
}
// put that good code in getHeaders to some use
options.headers = this.getHeaders(params.headers);
// https if specified, fallback to http in any other case
if (options.protocol == 'https:') {
request = https.request(options);
} else {
request = http.request(options);
}
// get content length and fire away
this.getLength(function(err, length) {
if (err) {
this._error(err);
return;
}
// add content length
request.setHeader('Content-Length', length);
this.pipe(request);
if (cb) {
request.on('error', cb);
request.on('response', cb.bind(this, null));
}
}.bind(this));
return request;
};
FormData.prototype._error = function(err) {
if (!this.error) {
this.error = err;
this.pause();
this.emit('error', err);
}
};
FormData.prototype.toString = function () {
return '[object FormData]';
};