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Edit File : form_data.js \| Size : 11.96 KB
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]'; }; Back

Edit File : form_data.js | Size : 11.96 KB

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]';
};

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