EGroupware / egroupware

* MIT Licensed

* http://www.23developer.com/opensource

* http://github.com/23/resumable.js

* Steffen Tiedemann Christensen, [email protected]

*/

(function(){

"use strict";

  var Resumable = function(opts){

    if ( !(this instanceof Resumable) ) {

      return new Resumable(opts);

    }

    this.version = 1.0;

    // SUPPORTED BY BROWSER?

    // Check if these features are support by the browser:

    // - File object type

    // - Blob object type

    // - FileList object type

    // - slicing files

    this.support = (

                   (typeof(File)!=='undefined')

                   &&

                   (typeof(Blob)!=='undefined')

                   &&

                   (typeof(FileList)!=='undefined')

                   &&

                   (!!Blob.prototype.webkitSlice||!!Blob.prototype.mozSlice||!!Blob.prototype.slice||false)

                   );

    if(!this.support) return(false);

    // PROPERTIES

    var $ = this;

    $.files = [];

    $.defaults = {

      chunkSize:1*1024*1024,

      forceChunkSize:false,

      simultaneousUploads:3,

      fileParameterName:'file',

      chunkNumberParameterName: 'resumableChunkNumber',

      chunkSizeParameterName: 'resumableChunkSize',

      currentChunkSizeParameterName: 'resumableCurrentChunkSize',

      totalSizeParameterName: 'resumableTotalSize',

      typeParameterName: 'resumableType',

      identifierParameterName: 'resumableIdentifier',

      fileNameParameterName: 'resumableFilename',

      relativePathParameterName: 'resumableRelativePath',

      totalChunksParameterName: 'resumableTotalChunks',

      dragOverClass: 'dragover',

      throttleProgressCallbacks: 0.5,

      query:{},

      headers:{},

      preprocess:null,

      preprocessFile:null,

      method:'multipart',

      uploadMethod: 'POST',

      testMethod: 'GET',

      prioritizeFirstAndLastChunk:false,

      target:'/',

      testTarget: null,

      parameterNamespace:'',

      testChunks:true,

      generateUniqueIdentifier:null,

      getTarget:null,

      maxChunkRetries:100,

      chunkRetryInterval:undefined,

      permanentErrors:[400, 401, 403, 404, 409, 415, 500, 501],

      maxFiles:undefined,

      withCredentials:false,

      xhrTimeout:0,

      clearInput:true,

      chunkFormat:'blob',

      setChunkTypeFromFile:false,

      maxFilesErrorCallback:function (files, errorCount) {

        var maxFiles = $.getOpt('maxFiles');

      },

      minFileSize:1,

      minFileSizeErrorCallback:function(file, errorCount) {

      },

      maxFileSize:undefined,

      maxFileSizeErrorCallback:function(file, errorCount) {

      },

      fileType: [],

      fileTypeErrorCallback: function(file, errorCount) {

      }

    };

    $.opts = opts||{};

    $.getOpt = function(o) {

      var $opt = this;

      // Get multiple option if passed an array

      if(o instanceof Array) {

        var options = {};

        $h.each(o, function(option){

          options[option] = $opt.getOpt(option);

        });

        return options;

      }

      // Otherwise, just return a simple option

      if ($opt instanceof ResumableChunk) {

        if (typeof $opt.opts[o] !== 'undefined') { return $opt.opts[o]; }

      }

      if ($opt instanceof ResumableFile) {

        if (typeof $opt.opts[o] !== 'undefined') { return $opt.opts[o]; }

      }

      if ($opt instanceof Resumable) {

        if (typeof $opt.opts[o] !== 'undefined') { return $opt.opts[o]; }

      }

    };

    $.indexOf = function(array, obj) {

    	if (array.indexOf) { return array.indexOf(obj); }

    	for (var i = 0; i < array.length; i++) {

            if (array[i] === obj) { return i; }

        }

        return -1;

    }

    // EVENTS

    // catchAll(event, ...)

    // fileSuccess(file), fileProgress(file), fileAdded(file, event), filesAdded(files, filesSkipped), fileRetry(file),

    // fileError(file, message), complete(), progress(), error(message, file), pause()

    $.events = [];

    $.on = function(event,callback){

      $.events.push(event.toLowerCase(), callback);

    };

    $.fire = function(){

      // `arguments` is an object, not array, in FF, so:

      var args = [];

      for (var i=0; i<arguments.length; i++) args.push(arguments[i]);

      // Find event listeners, and support pseudo-event `catchAll`

      var event = args[0].toLowerCase();

      for (var i=0; i<=$.events.length; i+=2) {

        if($.events[i]==event) $.events[i+1].apply($,args.slice(1));

        if($.events[i]=='catchall') $.events[i+1].apply(null,args);

      }

      if(event=='fileerror') $.fire('error', args[2], args[1]);

      if(event=='fileprogress') $.fire('progress');

    };

    // INTERNAL HELPER METHODS (handy, but ultimately not part of uploading)

    var $h = {

      stopEvent: function(e){

        e.stopPropagation();

        e.preventDefault();

      },

      each: function(o,callback){

        if(typeof(o.length)!=='undefined') {

          for (var i=0; i<o.length; i++) {

            // Array or FileList

            if(callback(o[i])===false) return;

          }

        } else {

          for (i in o) {

            // Object

            if(callback(i,o[i])===false) return;

          }

        }

      },

      generateUniqueIdentifier:function(file, event){

        var custom = $.getOpt('generateUniqueIdentifier');

        if(typeof custom === 'function') {

          return custom(file, event);

        }

        var relativePath = file.webkitRelativePath||file.relativePath||file.fileName||file.name; // Some confusion in different versions of Firefox

        var size = file.size;

        return(size + '-' + relativePath.replace(/[^0-9a-zA-Z_-]/img, ''));

      },

      contains:function(array,test) {

        var result = false;

        $h.each(array, function(value) {

          if (value == test) {

            result = true;

            return false;

          }

          return true;

        });

        return result;

      },

      formatSize:function(size){

        if(size<1024) {

          return size + ' bytes';

        } else if(size<1024*1024) {

          return (size/1024.0).toFixed(0) + ' KB';

        } else if(size<1024*1024*1024) {

          return (size/1024.0/1024.0).toFixed(1) + ' MB';

        } else {

          return (size/1024.0/1024.0/1024.0).toFixed(1) + ' GB';

        }

      },

      getTarget:function(request, params){

        var target = $.getOpt('target');

        if (request === 'test' && $.getOpt('testTarget')) {

          target = $.getOpt('testTarget') === '/' ? $.getOpt('target') : $.getOpt('testTarget');

        }

        if (typeof target === 'function') {

          return target(params);

        }

        var separator = target.indexOf('?') < 0 ? '?' : '&';

        var joinedParams = params.join('&');

        if (joinedParams) target = target + separator + joinedParams;

        return target;

      }

    };

    var onDrop = function(e){

      e.currentTarget.classList.remove($.getOpt('dragOverClass'));

      $h.stopEvent(e);

      //handle dropped things as items if we can (this lets us deal with folders nicer in some cases)

      if (e.dataTransfer && e.dataTransfer.items) {

        loadFiles(e.dataTransfer.items, e);

      }

      //else handle them as files

      else if (e.dataTransfer && e.dataTransfer.files) {

        loadFiles(e.dataTransfer.files, e);

      }

    };

    var onDragLeave = function(e){

      e.currentTarget.classList.remove($.getOpt('dragOverClass'));

    };

    var onDragOverEnter = function(e) {

      e.preventDefault();

      var dt = e.dataTransfer;

      if ($.indexOf(dt.types, "Files") >= 0) { // only for file drop

        e.stopPropagation();

        dt.dropEffect = "copy";

        dt.effectAllowed = "copy";

        e.currentTarget.classList.add($.getOpt('dragOverClass'));

      } else { // not work on IE/Edge....

        dt.dropEffect = "none";

        dt.effectAllowed = "none";

      }

    };

    /**

     * processes a single upload item (file or directory)

     * @param {Object} item item to upload, may be file or directory entry

     * @param {string} path current file path

     * @param {File[]} items list of files to append new items to

     * @param {Function} cb callback invoked when item is processed

     */

    function processItem(item, path, items, cb) {

      var entry;

      if(item.isFile){

        // file provided

        return item.file(function(file){

          file.relativePath = path + file.name;

          items.push(file);

          cb();

        });

      }else if(item.isDirectory){

        // item is already a directory entry, just assign

        entry = item;

      }else if(item instanceof File) {

        items.push(item);

      }

      if('function' === typeof item.webkitGetAsEntry){

        // get entry from file object

        entry = item.webkitGetAsEntry();

      }

      if(entry && entry.isDirectory){

        // directory provided, process it

        return processDirectory(entry, path + entry.name + '/', items, cb);

      }

      if('function' === typeof item.getAsFile){

        // item represents a File object, convert it

        item = item.getAsFile();

        if(item instanceof File) {

          item.relativePath = path + item.name;

          items.push(item);

        }

      }

      cb(); // indicate processing is done

    }

    /**

     * cps-style list iteration.

     * invokes all functions in list and waits for their callback to be

     * triggered.

     * @param  {Function[]}   items list of functions expecting callback parameter

     * @param  {Function} cb    callback to trigger after the last callback has been invoked

     */

    function processCallbacks(items, cb){

      if(!items || items.length === 0){

        // empty or no list, invoke callback

        return cb();

      }

      // invoke current function, pass the next part as continuation

      items[0](function(){

        processCallbacks(items.slice(1), cb);

      });

    }

    /**

     * recursively traverse directory and collect files to upload

     * @param  {Object}   directory directory to process

     * @param  {string}   path      current path

     * @param  {File[]}   items     target list of items

     * @param  {Function} cb        callback invoked after traversing directory

     */

    function processDirectory (directory, path, items, cb) {

      var dirReader = directory.createReader();

      var allEntries = [];

      function readEntries () {

        dirReader.readEntries(function(entries){

          if (entries.length) {

            allEntries = allEntries.concat(entries);

            return readEntries();

          }

          // process all conversion callbacks, finally invoke own one

          processCallbacks(

            allEntries.map(function(entry){

              // bind all properties except for callback

            }),

            cb

          );

        });

      }

      readEntries();

    }

    /**

     * process items to extract files to be uploaded

     * @param  {File[]} items items to process

     * @param  {Event} event event that led to upload

     */

    function loadFiles(items, event) {

      if(!items.length){

        return; // nothing to do

      }

      $.fire('beforeAdd');

      var files = [];

      processCallbacks(

          Array.prototype.map.call(items, function(item){

            // bind all properties except for callback

            var entry = item;

            if('function' === typeof item.webkitGetAsEntry){

              entry = item.webkitGetAsEntry();

            }

          }),

          function(){

            if(files.length){

              // at least one file found

              appendFilesFromFileList(files, event);

            }

          }

      );

    };

    var appendFilesFromFileList = function(fileList, event){

      // check for uploading too many files

      var errorCount = 0;

      var o = $.getOpt(['maxFiles', 'minFileSize', 'maxFileSize', 'maxFilesErrorCallback', 'minFileSizeErrorCallback', 'maxFileSizeErrorCallback', 'fileType', 'fileTypeErrorCallback']);

      if (typeof(o.maxFiles)!=='undefined' && o.maxFiles<(fileList.length+$.files.length)) {

        // if single-file upload, file is already added, and trying to add 1 new file, simply replace the already-added file

        if (o.maxFiles===1 && $.files.length===1 && fileList.length===1) {

          $.removeFile($.files[0]);

        } else {

          o.maxFilesErrorCallback(fileList, errorCount++);

          return false;

        }

      }

      var files = [], filesSkipped = [], remaining = fileList.length;

      var decreaseReamining = function(){

        if(!--remaining){

          // all files processed, trigger event

          if(!files.length && !filesSkipped.length){

            // no succeeded files, just skip

            return;

          }

          window.setTimeout(function(){

            $.fire('filesAdded', files, filesSkipped);

          },0);

        }

      };

      $h.each(fileList, function(file){

        var fileName = file.name;

        var fileType = file.type; // e.g video/mp4

        if(o.fileType.length > 0){

          var fileTypeFound = false;

          for(var index in o.fileType){

            // For good behaviour we do some inital sanitizing. Remove spaces and lowercase all

            o.fileType[index] = o.fileType[index].replace(/\s/g, '').toLowerCase();

            // Allowing for both [extension, .extension, mime/type, mime/*]

            var extension = ((o.fileType[index].match(/^[^.][^/]+$/)) ? '.' : '') + o.fileType[index];

            if ((fileName.substr(-1 * extension.length).toLowerCase() === extension) ||

              //If MIME type, check for wildcard or if extension matches the files tiletype

              (extension.indexOf('/') !== -1 && (

                (extension.indexOf('*') !== -1 && fileType.substr(0, extension.indexOf('*')) === extension.substr(0, extension.indexOf('*'))) ||

                fileType === extension

              ))

            ){

              fileTypeFound = true;

              break;

            }

          }

          if (!fileTypeFound) {

            o.fileTypeErrorCallback(file, errorCount++);

            return true;

          }

        }

        if (typeof(o.minFileSize)!=='undefined' && file.size<o.minFileSize) {

          o.minFileSizeErrorCallback(file, errorCount++);

          return true;

        }

        if (typeof(o.maxFileSize)!=='undefined' && file.size>o.maxFileSize) {

          o.maxFileSizeErrorCallback(file, errorCount++);

          return true;

        }

        var uniqueIdentifier = $h.generateUniqueIdentifier(file, event);

        if(uniqueIdentifier && typeof uniqueIdentifier.then === 'function'){

          // Promise or Promise-like object provided as unique identifier

          uniqueIdentifier

          .then(

            function(uniqueIdentifier){

              // unique identifier generation succeeded

              addFile(uniqueIdentifier);

            },

           function(){

              // unique identifier generation failed

              // skip further processing, only decrease file count

              decreaseReamining();

            }

          );

        }else{

          // non-Promise provided as unique identifier, process synchronously

          addFile(uniqueIdentifier);

        }

      });

    };

    // INTERNAL OBJECT TYPES

    function ResumableFile(resumableObj, file, uniqueIdentifier){

      var $ = this;

      $.opts = {};

      $.getOpt = resumableObj.getOpt;

      $._prevProgress = 0;

      $.resumableObj = resumableObj;

      $.file = file;

      $.fileName = file.fileName||file.name; // Some confusion in different versions of Firefox

      $.size = file.size;

      $.relativePath = file.relativePath || file.webkitRelativePath || $.fileName;

      $.uniqueIdentifier = uniqueIdentifier;

      $._pause = false;

      $.container = '';

      $.preprocessState = 0; // 0 = unprocessed, 1 = processing, 2 = finished

      var _error = uniqueIdentifier !== undefined;

      // Callback when something happens within the chunk

      var chunkEvent = function(event, message){

        // event can be 'progress', 'success', 'error' or 'retry'

        switch(event){

        case 'progress':

          $.resumableObj.fire('fileProgress', $, message);

          break;

        case 'error':

          $.abort();

          _error = true;

          $.chunks = [];

          $.resumableObj.fire('fileError', $, message);

          break;

        case 'success':

          if(_error) return;

          $.resumableObj.fire('fileProgress', $, message); // it's at least progress

          if($.isComplete()) {

            $.resumableObj.fire('fileSuccess', $, message);

          }

          break;

        case 'retry':

          $.resumableObj.fire('fileRetry', $);

          break;

        }

      };

      // Main code to set up a file object with chunks,

      // packaged to be able to handle retries if needed.

      $.chunks = [];

      $.abort = function(){

        // Stop current uploads

        var abortCount = 0;

        $h.each($.chunks, function(c){

          if(c.status()=='uploading') {

            c.abort();

            abortCount++;

          }

        });

        if(abortCount>0) $.resumableObj.fire('fileProgress', $);

      };

      $.cancel = function(){

        // Reset this file to be void

        var _chunks = $.chunks;

        $.chunks = [];

        // Stop current uploads

        $h.each(_chunks, function(c){

          if(c.status()=='uploading')  {

            c.abort();

            $.resumableObj.uploadNextChunk();

          }

        });

        $.resumableObj.removeFile($);

        $.resumableObj.fire('fileProgress', $);

      };

      $.retry = function(){

        $.bootstrap();

        var firedRetry = false;

        $.resumableObj.on('chunkingComplete', function(){

          if(!firedRetry) $.resumableObj.upload();

          firedRetry = true;

        });

      };

      $.bootstrap = function(){

        $.abort();

        _error = false;

        // Rebuild stack of chunks from file

        $.chunks = [];

        $._prevProgress = 0;

        var round = $.getOpt('forceChunkSize') ? Math.ceil : Math.floor;

        var maxOffset = Math.max(round($.file.size/$.getOpt('chunkSize')),1);

        for (var offset=0; offset<maxOffset; offset++) {(function(offset){

            window.setTimeout(function(){

                $.chunks.push(new ResumableChunk($.resumableObj, $, offset, chunkEvent));

                $.resumableObj.fire('chunkingProgress',$,offset/maxOffset);

            },0);

        })(offset)}

        window.setTimeout(function(){

            $.resumableObj.fire('chunkingComplete',$);

        },0);

      };

      $.progress = function(){

        if(_error) return(1);

        // Sum up progress across everything

        var ret = 0;

        var error = false;

        $h.each($.chunks, function(c){

          if(c.status()=='error') error = true;

          ret += c.progress(true); // get chunk progress relative to entire file

        });

        ret = (error ? 1 : (ret>0.99999 ? 1 : ret));

        ret = Math.max($._prevProgress, ret); // We don't want to lose percentages when an upload is paused

        $._prevProgress = ret;

        return(ret);

      };

      $.isUploading = function(){

        var uploading = false;

        $h.each($.chunks, function(chunk){

          if(chunk.status()=='uploading') {

            uploading = true;

            return(false);

          }

        });

        return(uploading);

      };

      $.isComplete = function(){

        var outstanding = false;

        if ($.preprocessState === 1) {

          return(false);

        }

        $h.each($.chunks, function(chunk){

          var status = chunk.status();

          if(status=='pending' || status=='uploading' || chunk.preprocessState === 1) {

            outstanding = true;

            return(false);

          }

        });

        return(!outstanding);

      };

      $.pause = function(pause){

          if(typeof(pause)==='undefined'){

              $._pause = ($._pause ? false : true);

          }else{

              $._pause = pause;

          }

      };

      $.isPaused = function() {

        return $._pause;

      };

      $.preprocessFinished = function(){

        $.preprocessState = 2;

        $.upload();

      };

      $.upload = function () {

        var found = false;

        if ($.isPaused() === false) {

          var preprocess = $.getOpt('preprocessFile');

          if(typeof preprocess === 'function') {

            switch($.preprocessState) {

            case 0: $.preprocessState = 1; preprocess($); return(true);

            case 1: return(true);

            case 2: break;

            }

          }

          $h.each($.chunks, function (chunk) {

            if (chunk.status() == 'pending' && chunk.preprocessState !== 1) {

              chunk.send();

              found = true;

              return(false);

            }

          });

        }

        return(found);

      }

      $.markChunksCompleted = function (chunkNumber) {

        if (!$.chunks || $.chunks.length <= chunkNumber) {

            return;

        }

        for (var num = 0; num < chunkNumber; num++) {

            $.chunks[num].markComplete = true;

        }

      };

      // Bootstrap and return

      $.resumableObj.fire('chunkingStart', $);

      $.bootstrap();

      return(this);

    }

    function ResumableChunk(resumableObj, fileObj, offset, callback){

      var $ = this;

      $.opts = {};

      $.getOpt = resumableObj.getOpt;

      $.resumableObj = resumableObj;

      $.fileObj = fileObj;

      $.fileObjSize = fileObj.size;

      $.fileObjType = fileObj.file.type;

      $.offset = offset;

      $.callback = callback;

      $.lastProgressCallback = (new Date);

      $.tested = false;

      $.retries = 0;

      $.pendingRetry = false;

      $.preprocessState = 0; // 0 = unprocessed, 1 = processing, 2 = finished

      $.markComplete = false;

      // Computed properties

      var chunkSize = $.getOpt('chunkSize');

      $.loaded = 0;

      $.startByte = $.offset*chunkSize;

      $.endByte = Math.min($.fileObjSize, ($.offset+1)*chunkSize);

      if ($.fileObjSize-$.endByte < chunkSize && !$.getOpt('forceChunkSize')) {

        // The last chunk will be bigger than the chunk size, but less than 2*chunkSize

        $.endByte = $.fileObjSize;

      }

      $.xhr = null;

      // test() makes a GET request without any data to see if the chunk has already been uploaded in a previous session

      $.test = function(){

        // Set up request and listen for event

        $.xhr = new XMLHttpRequest();

        var testHandler = function(e){

          $.tested = true;

          var status = $.status();

          if(status=='success') {

            $.callback(status, $.message());

            $.resumableObj.uploadNextChunk();

          } else {

            $.send();

          }

        };

        $.xhr.addEventListener('load', testHandler, false);

        $.xhr.addEventListener('error', testHandler, false);

        $.xhr.addEventListener('timeout', testHandler, false);

        // Add data from the query options

        var params = [];

        var parameterNamespace = $.getOpt('parameterNamespace');

        var customQuery = $.getOpt('query');

        if(typeof customQuery == 'function') customQuery = customQuery($.fileObj, $);

        $h.each(customQuery, function(k,v){

          params.push([encodeURIComponent(parameterNamespace+k), encodeURIComponent(v)].join('='));

        });

        // Add extra data to identify chunk

        params = params.concat(

          [

            // define key/value pairs for additional parameters

            ['chunkNumberParameterName', $.offset + 1],

            ['chunkSizeParameterName', $.getOpt('chunkSize')],

            ['currentChunkSizeParameterName', $.endByte - $.startByte],

            ['totalSizeParameterName', $.fileObjSize],

            ['typeParameterName', $.fileObjType],

            ['identifierParameterName', $.fileObj.uniqueIdentifier],

            ['fileNameParameterName', $.fileObj.fileName],

            ['relativePathParameterName', $.fileObj.relativePath],

            ['totalChunksParameterName', $.fileObj.chunks.length]

          ].filter(function(pair){

            // include items that resolve to truthy values

            // i.e. exclude false, null, undefined and empty strings

            return $.getOpt(pair[0]);

          })

          .map(function(pair){

            // map each key/value pair to its final form

            return [

              parameterNamespace + $.getOpt(pair[0]),

              encodeURIComponent(pair[1])

            ].join('=');

          })

        );

        // Append the relevant chunk and send it

        $.xhr.open($.getOpt('testMethod'), $h.getTarget('test', params));

        $.xhr.timeout = $.getOpt('xhrTimeout');

        $.xhr.withCredentials = $.getOpt('withCredentials');

        // Add data from header options

        var customHeaders = $.getOpt('headers');

        if(typeof customHeaders === 'function') {

          customHeaders = customHeaders($.fileObj, $);

        }

        $h.each(customHeaders, function(k,v) {

          $.xhr.setRequestHeader(k, v);

        });

        $.xhr.send(null);

      };

      $.preprocessFinished = function(){

        $.preprocessState = 2;

        $.send();

      };

      // send() uploads the actual data in a POST call

      $.send = function(){

        var preprocess = $.getOpt('preprocess');

        if(typeof preprocess === 'function') {

          switch($.preprocessState) {

          case 0: $.preprocessState = 1; preprocess($); return;

          case 1: return;

          case 2: break;

          }

        }

        if($.getOpt('testChunks') && !$.tested) {

          $.test();

          return;

        }

        // Set up request and listen for event

        $.xhr = new XMLHttpRequest();

        // Progress

        $.xhr.upload.addEventListener('progress', function(e){

          if( (new Date) - $.lastProgressCallback > $.getOpt('throttleProgressCallbacks') * 1000 ) {

            $.callback('progress');

            $.lastProgressCallback = (new Date);

          }

          $.loaded=e.loaded||0;

        }, false);

        $.loaded = 0;

        $.pendingRetry = false;

        $.callback('progress');

        // Done (either done, failed or retry)

        var doneHandler = function(e){

          var status = $.status();

          if(status=='success'||status=='error') {

            $.callback(status, $.message());

            $.resumableObj.uploadNextChunk();

          } else {

            $.callback('retry', $.message());

            $.abort();

            $.retries++;

            var retryInterval = $.getOpt('chunkRetryInterval');

            if(retryInterval !== undefined) {

              $.pendingRetry = true;

              setTimeout($.send, retryInterval);

            } else {

              $.send();

            }

          }

        };

        $.xhr.addEventListener('load', doneHandler, false);

        $.xhr.addEventListener('error', doneHandler, false);

        $.xhr.addEventListener('timeout', doneHandler, false);

        // Set up the basic query data from Resumable

        var query = [

          ['chunkNumberParameterName', $.offset + 1],

          ['chunkSizeParameterName', $.getOpt('chunkSize')],

          ['currentChunkSizeParameterName', $.endByte - $.startByte],

          ['totalSizeParameterName', $.fileObjSize],

          ['typeParameterName', $.fileObjType],

          ['identifierParameterName', $.fileObj.uniqueIdentifier],

          ['fileNameParameterName', $.fileObj.fileName],

          ['relativePathParameterName', $.fileObj.relativePath],

          ['totalChunksParameterName', $.fileObj.chunks.length],

        ].filter(function(pair){

          // include items that resolve to truthy values

          // i.e. exclude false, null, undefined and empty strings

          return $.getOpt(pair[0]);

        })

        .reduce(function(query, pair){

          // assign query key/value

          query[$.getOpt(pair[0])] = pair[1];

          return query;

        }, {});

        // Mix in custom data

        var customQuery = $.getOpt('query');

        if(typeof customQuery == 'function') customQuery = customQuery($.fileObj, $);

        $h.each(customQuery, function(k,v){

          query[k] = v;

        });

        var func = ($.fileObj.file.slice ? 'slice' : ($.fileObj.file.mozSlice ? 'mozSlice' : ($.fileObj.file.webkitSlice ? 'webkitSlice' : 'slice')));

        var bytes = $.fileObj.file[func]($.startByte, $.endByte, $.getOpt('setChunkTypeFromFile') ? $.fileObj.file.type : "");

        var data = null;

        var params = [];

        var parameterNamespace = $.getOpt('parameterNamespace');

                if ($.getOpt('method') === 'octet') {

                    // Add data from the query options

                    data = bytes;

                    $h.each(query, function (k, v) {

                        params.push([encodeURIComponent(parameterNamespace + k), encodeURIComponent(v)].join('='));

                    });

                } else {

                    // Add data from the query options

                    data = new FormData();

                    $h.each(query, function (k, v) {

                        data.append(parameterNamespace + k, v);

                        params.push([encodeURIComponent(parameterNamespace + k), encodeURIComponent(v)].join('='));

                    });

                    if ($.getOpt('chunkFormat') == 'blob') {

                        data.append(parameterNamespace + $.getOpt('fileParameterName'), bytes, $.fileObj.fileName);

                    }

                    else if ($.getOpt('chunkFormat') == 'base64') {

                        var fr = new FileReader();

                        fr.onload = function (e) {

                            data.append(parameterNamespace + $.getOpt('fileParameterName'), fr.result);

                            $.xhr.send(data);

                        }

                        fr.readAsDataURL(bytes);

                    }

                }

        var target = $h.getTarget('upload', params);

        var method = $.getOpt('uploadMethod');

        $.xhr.open(method, target);

        if ($.getOpt('method') === 'octet') {

          $.xhr.setRequestHeader('Content-Type', 'application/octet-stream');

        }

        $.xhr.timeout = $.getOpt('xhrTimeout');

        $.xhr.withCredentials = $.getOpt('withCredentials');

        // Add data from header options

        var customHeaders = $.getOpt('headers');

        if(typeof customHeaders === 'function') {

          customHeaders = customHeaders($.fileObj, $);

        }

        $h.each(customHeaders, function(k,v) {

          $.xhr.setRequestHeader(k, v);

        });

        if ($.getOpt('chunkFormat') == 'blob') {

            $.xhr.send(data);

        }

      };

      $.abort = function(){

        // Abort and reset

        if($.xhr) $.xhr.abort();

        $.xhr = null;

      };

      $.status = function(){

        // Returns: 'pending', 'uploading', 'success', 'error'

        if($.pendingRetry) {

          // if pending retry then that's effectively the same as actively uploading,

          // there might just be a slight delay before the retry starts

          return('uploading');

        } else if($.markComplete) {

          return 'success';

        } else if(!$.xhr) {

          return('pending');

        } else if($.xhr.readyState<4) {

          // Status is really 'OPENED', 'HEADERS_RECEIVED' or 'LOADING' - meaning that stuff is happening

          return('uploading');

        } else {

          if($.xhr.status == 200 || $.xhr.status == 201) {

            // HTTP 200, 201 (created)

            return('success');

          } else if($h.contains($.getOpt('permanentErrors'), $.xhr.status) || $.retries >= $.getOpt('maxChunkRetries')) {

            // HTTP 400, 404, 409, 415, 500, 501 (permanent error)

            return('error');

          } else {

            // this should never happen, but we'll reset and queue a retry

            // a likely case for this would be 503 service unavailable

            $.abort();

            return('pending');

          }

        }

      };

      $.message = function(){

        return($.xhr ? $.xhr.responseText : '');

      };

      $.progress = function(relative){

        if(typeof(relative)==='undefined') relative = false;

        var factor = (relative ? ($.endByte-$.startByte)/$.fileObjSize : 1);

        if($.pendingRetry) return(0);

        if((!$.xhr || !$.xhr.status) && !$.markComplete) factor*=.95;

        var s = $.status();

        switch(s){

        case 'success':

        case 'error':

          return(1*factor);

        case 'pending':

          return(0*factor);

        default:

          return($.loaded/($.endByte-$.startByte)*factor);

        }

      };

      return(this);

    }

    // QUEUE

    $.uploadNextChunk = function(){

      var found = false;

      // In some cases (such as videos) it's really handy to upload the first

      // and last chunk of a file quickly; this let's the server check the file's

      // metadata and determine if there's even a point in continuing.

      if ($.getOpt('prioritizeFirstAndLastChunk')) {

        $h.each($.files, function(file){

          if(file.chunks.length && file.chunks[0].status()=='pending' && file.chunks[0].preprocessState === 0) {

            file.chunks[0].send();

            found = true;

            return(false);

          }

          if(file.chunks.length>1 && file.chunks[file.chunks.length-1].status()=='pending' && file.chunks[file.chunks.length-1].preprocessState === 0) {

            file.chunks[file.chunks.length-1].send();

            found = true;

            return(false);

          }

        });

        if(found) return(true);

      }

      // Now, simply look for the next, best thing to upload

      $h.each($.files, function(file){

        found = file.upload();

        if(found) return(false);

      });

      if(found) return(true);

      // The are no more outstanding chunks to upload, check is everything is done

      var outstanding = false;

      $h.each($.files, function(file){

        if(!file.isComplete()) {

          outstanding = true;

          return(false);

        }

      });

      if(!outstanding) {

        // All chunks have been uploaded, complete

        $.fire('complete');

      }

      return(false);

    };

    // PUBLIC METHODS FOR RESUMABLE.JS

    $.assignBrowse = function(domNodes, isDirectory){

      if(typeof(domNodes.length)=='undefined') domNodes = [domNodes];

      $h.each(domNodes, function(domNode) {

        var input;

        if(domNode.tagName==='INPUT' && domNode.type==='file'){

          input = domNode;

        } else {

          input = document.createElement('input');

          input.setAttribute('type', 'file');

          input.style.display = 'none';

          domNode.addEventListener('click', function(){

            input.style.opacity = 0;

            input.style.display='block';

            input.focus();

            input.click();

            input.style.display='none';

          }, false);

          domNode.appendChild(input);

        }

        var maxFiles = $.getOpt('maxFiles');

        if (typeof(maxFiles)==='undefined'||maxFiles!=1){

          input.setAttribute('multiple', 'multiple');

        } else {

          input.removeAttribute('multiple');

        }

        if(isDirectory){

          input.setAttribute('webkitdirectory', 'webkitdirectory');

        } else {

          input.removeAttribute('webkitdirectory');

        }

        var fileTypes = $.getOpt('fileType');

        if (typeof (fileTypes) !== 'undefined' && fileTypes.length >= 1) {

          input.setAttribute('accept', fileTypes.map(function (e) {

            e = e.replace(/\s/g, '').toLowerCase();

            if(e.match(/^[^.][^/]+$/)){

              e = '.' + e;

            }

            return e;

          }).join(','));

        }

        else {

          input.removeAttribute('accept');

        }

        // When new files are added, simply append them to the overall list

        input.addEventListener('change', function(e){

          appendFilesFromFileList(e.target.files,e);

          var clearInput = $.getOpt('clearInput');

          if (clearInput) {

            e.target.value = '';

          }

        }, false);

      });

    };

    $.assignDrop = function(domNodes){

      if(typeof(domNodes.length)=='undefined') domNodes = [domNodes];

      $h.each(domNodes, function(domNode) {

        domNode.addEventListener('dragover', onDragOverEnter, false);

        domNode.addEventListener('dragenter', onDragOverEnter, false);

        domNode.addEventListener('dragleave', onDragLeave, false);

        domNode.addEventListener('drop', onDrop, false);

      });

    };

    $.unAssignDrop = function(domNodes) {

      if (typeof(domNodes.length) == 'undefined') domNodes = [domNodes];