strata/lib/multipart/part.js

A modular, streaming HTTP server

var util = require('util');
var EventEmitter = require('events').EventEmitter;

module.exports = Part;

/**
 * A container class for data pertaining to one part of a multipart message.
 */
function Part() {
  this.headers = {};
}

util.inherits(Part, EventEmitter);

/**
 * Returns the name of this part.
 */
Part.prototype.__defineGetter__('name', function () {
  var disposition = this.headers['content-disposition'], match;

  if (disposition && (match = disposition.match(/name="([^"]+)"/i))) {
    return match[1];
  }

  return this.headers['content-id'] || null;
});

/**
 * Returns the filename of this part if it originated from a file upload.
 */
Part.prototype.__defineGetter__('filename', function () {
  var disposition = this.headers['content-disposition'];

  if (disposition) {
    var match = disposition.match(/filename="([^;]*)"/i), filename;

    if (match) {
      filename = decodeURIComponent(match[1].replace(/\\"/g, '"'));
    } else {
      // Match unquoted filename.
      match = disposition.match(/filename=([^;]+)/i);
      if (match) {
        filename = decodeURIComponent(match[1]);
      }
    }

    if (filename) {
      // Take the last part of the filename. This handles full Windows
      // paths given by IE (and possibly other dumb clients).
      return filename.substr(filename.lastIndexOf('\\') + 1);
    }
  }

  return null;
});

/**
 * Returns the Content-Type of this part.
 */
Part.prototype.__defineGetter__('type', function () {
  return this.headers['content-type'] || null;
});

Part.prototype.write = function (buffer) {
  this.emit('data', buffer);
};

Part.prototype.end = function () {
  this.emit('end');
};