fix merge conflicts

2 files changed, 1031 insertions, 0 deletions

diff --git a/files/js/jquery.fileupload.js b/files/js/jquery.fileupload.js
new file mode 100644
index 00000000000..a89e9dc2c44
--- /dev/null
+++ b/files/js/jquery.fileupload.js
@@ -0,0 +1,866 @@
+/*
+ * jQuery File Upload Plugin 5.9
+ * https://github.com/blueimp/jQuery-File-Upload
+ *
+ * Copyright 2010, Sebastian Tschan
+ * https://blueimp.net
+ *
+ * Licensed under the MIT license:
+ * http://www.opensource.org/licenses/MIT
+ */
+
+/*jslint nomen: true, unparam: true, regexp: true */
+/*global define, window, document, Blob, FormData, location */
+
+(function (factory) {
+    'use strict';
+    if (typeof define === 'function' && define.amd) {
+        // Register as an anonymous AMD module:
+        define([
+            'jquery',
+            'jquery.ui.widget'
+        ], factory);
+    } else {
+        // Browser globals:
+        factory(window.jQuery);
+    }
+}(function ($) {
+    'use strict';
+
+    // The FileReader API is not actually used, but works as feature detection,
+    // as e.g. Safari supports XHR file uploads via the FormData API,
+    // but not non-multipart XHR file uploads:
+    $.support.xhrFileUpload = !!(window.XMLHttpRequestUpload && window.FileReader);
+    $.support.xhrFormDataFileUpload = !!window.FormData;
+
+    // The fileupload widget listens for change events on file input fields defined
+    // via fileInput setting and paste or drop events of the given dropZone.
+    // In addition to the default jQuery Widget methods, the fileupload widget
+    // exposes the "add" and "send" methods, to add or directly send files using
+    // the fileupload API.
+    // By default, files added via file input selection, paste, drag & drop or
+    // "add" method are uploaded immediately, but it is possible to override
+    // the "add" callback option to queue file uploads.
+    $.widget('blueimp.fileupload', {
+
+        options: {
+            // The namespace used for event handler binding on the dropZone and
+            // fileInput collections.
+            // If not set, the name of the widget ("fileupload") is used.
+            namespace: undefined,
+            // The drop target collection, by the default the complete document.
+            // Set to null or an empty collection to disable drag & drop support:
+            dropZone: $(document),
+            // The file input field collection, that is listened for change events.
+            // If undefined, it is set to the file input fields inside
+            // of the widget element on plugin initialization.
+            // Set to null or an empty collection to disable the change listener.
+            fileInput: undefined,
+            // By default, the file input field is replaced with a clone after
+            // each input field change event. This is required for iframe transport
+            // queues and allows change events to be fired for the same file
+            // selection, but can be disabled by setting the following option to false:
+            replaceFileInput: true,
+            // The parameter name for the file form data (the request argument name).
+            // If undefined or empty, the name property of the file input field is
+            // used, or "files[]" if the file input name property is also empty:
+            paramName: undefined,
+            // By default, each file of a selection is uploaded using an individual
+            // request for XHR type uploads. Set to false to upload file
+            // selections in one request each:
+            singleFileUploads: true,
+            // To limit the number of files uploaded with one XHR request,
+            // set the following option to an integer greater than 0:
+            limitMultiFileUploads: undefined,
+            // Set the following option to true to issue all file upload requests
+            // in a sequential order:
+            sequentialUploads: false,
+            // To limit the number of concurrent uploads,
+            // set the following option to an integer greater than 0:
+            limitConcurrentUploads: undefined,
+            // Set the following option to true to force iframe transport uploads:
+            forceIframeTransport: false,
+            // Set the following option to the location of a redirect url on the
+            // origin server, for cross-domain iframe transport uploads:
+            redirect: undefined,
+            // The parameter name for the redirect url, sent as part of the form
+            // data and set to 'redirect' if this option is empty:
+            redirectParamName: undefined,
+            // Set the following option to the location of a postMessage window,
+            // to enable postMessage transport uploads:
+            postMessage: undefined,
+            // By default, XHR file uploads are sent as multipart/form-data.
+            // The iframe transport is always using multipart/form-data.
+            // Set to false to enable non-multipart XHR uploads:
+            multipart: true,
+            // To upload large files in smaller chunks, set the following option
+            // to a preferred maximum chunk size. If set to 0, null or undefined,
+            // or the browser does not support the required Blob API, files will
+            // be uploaded as a whole.
+            maxChunkSize: undefined,
+            // When a non-multipart upload or a chunked multipart upload has been
+            // aborted, this option can be used to resume the upload by setting
+            // it to the size of the already uploaded bytes. This option is most
+            // useful when modifying the options object inside of the "add" or
+            // "send" callbacks, as the options are cloned for each file upload.
+            uploadedBytes: undefined,
+            // By default, failed (abort or error) file uploads are removed from the
+            // global progress calculation. Set the following option to false to
+            // prevent recalculating the global progress data:
+            recalculateProgress: true,
+
+            // Additional form data to be sent along with the file uploads can be set
+            // using this option, which accepts an array of objects with name and
+            // value properties, a function returning such an array, a FormData
+            // object (for XHR file uploads), or a simple object.
+            // The form of the first fileInput is given as parameter to the function:
+            formData: function (form) {
+                return form.serializeArray();
+            },
+
+            // The add callback is invoked as soon as files are added to the fileupload
+            // widget (via file input selection, drag & drop, paste or add API call).
+            // If the singleFileUploads option is enabled, this callback will be
+            // called once for each file in the selection for XHR file uplaods, else
+            // once for each file selection.
+            // The upload starts when the submit method is invoked on the data parameter.
+            // The data object contains a files property holding the added files
+            // and allows to override plugin options as well as define ajax settings.
+            // Listeners for this callback can also be bound the following way:
+            // .bind('fileuploadadd', func);
+            // data.submit() returns a Promise object and allows to attach additional
+            // handlers using jQuery's Deferred callbacks:
+            // data.submit().done(func).fail(func).always(func);
+            add: function (e, data) {
+                data.submit();
+            },
+
+            // Other callbacks:
+            // Callback for the submit event of each file upload:
+            // submit: function (e, data) {}, // .bind('fileuploadsubmit', func);
+            // Callback for the start of each file upload request:
+            // send: function (e, data) {}, // .bind('fileuploadsend', func);
+            // Callback for successful uploads:
+            // done: function (e, data) {}, // .bind('fileuploaddone', func);
+            // Callback for failed (abort or error) uploads:
+            // fail: function (e, data) {}, // .bind('fileuploadfail', func);
+            // Callback for completed (success, abort or error) requests:
+            // always: function (e, data) {}, // .bind('fileuploadalways', func);
+            // Callback for upload progress events:
+            // progress: function (e, data) {}, // .bind('fileuploadprogress', func);
+            // Callback for global upload progress events:
+            // progressall: function (e, data) {}, // .bind('fileuploadprogressall', func);
+            // Callback for uploads start, equivalent to the global ajaxStart event:
+            // start: function (e) {}, // .bind('fileuploadstart', func);
+            // Callback for uploads stop, equivalent to the global ajaxStop event:
+            // stop: function (e) {}, // .bind('fileuploadstop', func);
+            // Callback for change events of the fileInput collection:
+            // change: function (e, data) {}, // .bind('fileuploadchange', func);
+            // Callback for paste events to the dropZone collection:
+            // paste: function (e, data) {}, // .bind('fileuploadpaste', func);
+            // Callback for drop events of the dropZone collection:
+            // drop: function (e, data) {}, // .bind('fileuploaddrop', func);
+            // Callback for dragover events of the dropZone collection:
+            // dragover: function (e) {}, // .bind('fileuploaddragover', func);
+
+            // The plugin options are used as settings object for the ajax calls.
+            // The following are jQuery ajax settings required for the file uploads:
+            processData: false,
+            contentType: false,
+            cache: false
+        },
+
+        // A list of options that require a refresh after assigning a new value:
+        _refreshOptionsList: [
+            'namespace',
+            'dropZone',
+            'fileInput',
+            'multipart',
+            'forceIframeTransport'
+        ],
+
+        _isXHRUpload: function (options) {
+            return !options.forceIframeTransport &&
+                ((!options.multipart && $.support.xhrFileUpload) ||
+                $.support.xhrFormDataFileUpload);
+        },
+
+        _getFormData: function (options) {
+            var formData;
+            if (typeof options.formData === 'function') {
+                return options.formData(options.form);
+            } else if ($.isArray(options.formData)) {
+                return options.formData;
+            } else if (options.formData) {
+                formData = [];
+                $.each(options.formData, function (name, value) {
+                    formData.push({name: name, value: value});
+                });
+                return formData;
+            }
+            return [];
+        },
+
+        _getTotal: function (files) {
+            var total = 0;
+            $.each(files, function (index, file) {
+                total += file.size || 1;
+            });
+            return total;
+        },
+
+        _onProgress: function (e, data) {
+            if (e.lengthComputable) {
+                var total = data.total || this._getTotal(data.files),
+                    loaded = parseInt(
+                        e.loaded / e.total * (data.chunkSize || total),
+                        10
+                    ) + (data.uploadedBytes || 0);
+                this._loaded += loaded - (data.loaded || data.uploadedBytes || 0);
+                data.lengthComputable = true;
+                data.loaded = loaded;
+                data.total = total;
+                // Trigger a custom progress event with a total data property set
+                // to the file size(s) of the current upload and a loaded data
+                // property calculated accordingly:
+                this._trigger('progress', e, data);
+                // Trigger a global progress event for all current file uploads,
+                // including ajax calls queued for sequential file uploads:
+                this._trigger('progressall', e, {
+                    lengthComputable: true,
+                    loaded: this._loaded,
+                    total: this._total
+                });
+            }
+        },
+
+        _initProgressListener: function (options) {
+            var that = this,
+                xhr = options.xhr ? options.xhr() : $.ajaxSettings.xhr();
+            // Accesss to the native XHR object is required to add event listeners
+            // for the upload progress event:
+            if (xhr.upload) {
+                $(xhr.upload).bind('progress', function (e) {
+                    var oe = e.originalEvent;
+                    // Make sure the progress event properties get copied over:
+                    e.lengthComputable = oe.lengthComputable;
+                    e.loaded = oe.loaded;
+                    e.total = oe.total;
+                    that._onProgress(e, options);
+                });
+                options.xhr = function () {
+                    return xhr;
+                };
+            }
+        },
+
+        _initXHRData: function (options) {
+            var formData,
+                file = options.files[0],
+                // Ignore non-multipart setting if not supported:
+                multipart = options.multipart || !$.support.xhrFileUpload;
+            if (!multipart || options.blob) {
+                // For non-multipart uploads and chunked uploads,
+                // file meta data is not part of the request body,
+                // so we transmit this data as part of the HTTP headers.
+                // For cross domain requests, these headers must be allowed
+                // via Access-Control-Allow-Headers or removed using
+                // the beforeSend callback:
+                options.headers = $.extend(options.headers, {
+                    'X-File-Name': file.name,
+                    'X-File-Type': file.type,
+                    'X-File-Size': file.size
+                });
+                if (!options.blob) {
+                    // Non-chunked non-multipart upload:
+                    options.contentType = file.type;
+                    options.data = file;
+                } else if (!multipart) {
+                    // Chunked non-multipart upload:
+                    options.contentType = 'application/octet-stream';
+                    options.data = options.blob;
+                }
+            }
+            if (multipart && $.support.xhrFormDataFileUpload) {
+                if (options.postMessage) {
+                    // window.postMessage does not allow sending FormData
+                    // objects, so we just add the File/Blob objects to
+                    // the formData array and let the postMessage window
+                    // create the FormData object out of this array:
+                    formData = this._getFormData(options);
+                    if (options.blob) {
+                        formData.push({
+                            name: options.paramName,
+                            value: options.blob
+                        });
+                    } else {
+                        $.each(options.files, function (index, file) {
+                            formData.push({
+                                name: options.paramName,
+                                value: file
+                            });
+                        });
+                    }
+                } else {
+                    if (options.formData instanceof FormData) {
+                        formData = options.formData;
+                    } else {
+                        formData = new FormData();
+                        $.each(this._getFormData(options), function (index, field) {
+                            formData.append(field.name, field.value);
+                        });
+                    }
+                    if (options.blob) {
+                        formData.append(options.paramName, options.blob, file.name);
+                    } else {
+                        $.each(options.files, function (index, file) {
+                            // File objects are also Blob instances.
+                            // This check allows the tests to run with
+                            // dummy objects:
+                            if (file instanceof Blob) {
+                                formData.append(options.paramName, file, file.name);
+                            }
+                        });
+                    }
+                }
+                options.data = formData;
+            }
+            // Blob reference is not needed anymore, free memory:
+            options.blob = null;
+        },
+
+        _initIframeSettings: function (options) {
+            // Setting the dataType to iframe enables the iframe transport:
+            options.dataType = 'iframe ' + (options.dataType || '');
+            // The iframe transport accepts a serialized array as form data:
+            options.formData = this._getFormData(options);
+            // Add redirect url to form data on cross-domain uploads:
+            if (options.redirect && $('<a></a>').prop('href', options.url)
+                    .prop('host') !== location.host) {
+                options.formData.push({
+                    name: options.redirectParamName || 'redirect',
+                    value: options.redirect
+                });
+            }
+        },
+
+        _initDataSettings: function (options) {
+            if (this._isXHRUpload(options)) {
+                if (!this._chunkedUpload(options, true)) {
+                    if (!options.data) {
+                        this._initXHRData(options);
+                    }
+                    this._initProgressListener(options);
+                }
+                if (options.postMessage) {
+                    // Setting the dataType to postmessage enables the
+                    // postMessage transport:
+                    options.dataType = 'postmessage ' + (options.dataType || '');
+                }
+            } else {
+                this._initIframeSettings(options, 'iframe');
+            }
+        },
+
+        _initFormSettings: function (options) {
+            // Retrieve missing options from the input field and the
+            // associated form, if available:
+            if (!options.form || !options.form.length) {
+                options.form = $(options.fileInput.prop('form'));
+            }
+            if (!options.paramName) {
+                options.paramName = options.fileInput.prop('name') ||
+                    'files[]';
+            }
+            if (!options.url) {
+                options.url = options.form.prop('action') || location.href;
+            }
+            // The HTTP request method must be "POST" or "PUT":
+            options.type = (options.type || options.form.prop('method') || '')
+                .toUpperCase();
+            if (options.type !== 'POST' && options.type !== 'PUT') {
+                options.type = 'POST';
+            }
+        },
+
+        _getAJAXSettings: function (data) {
+            var options = $.extend({}, this.options, data);
+            this._initFormSettings(options);
+            this._initDataSettings(options);
+            return options;
+        },
+
+        // Maps jqXHR callbacks to the equivalent
+        // methods of the given Promise object:
+        _enhancePromise: function (promise) {
+            promise.success = promise.done;
+            promise.error = promise.fail;
+            promise.complete = promise.always;
+            return promise;
+        },
+
+        // Creates and returns a Promise object enhanced with
+        // the jqXHR methods abort, success, error and complete:
+        _getXHRPromise: function (resolveOrReject, context, args) {
+            var dfd = $.Deferred(),
+                promise = dfd.promise();
+            context = context || this.options.context || promise;
+            if (resolveOrReject === true) {
+                dfd.resolveWith(context, args);
+            } else if (resolveOrReject === false) {
+                dfd.rejectWith(context, args);
+            }
+            promise.abort = dfd.promise;
+            return this._enhancePromise(promise);
+        },
+
+        // Uploads a file in multiple, sequential requests
+        // by splitting the file up in multiple blob chunks.
+        // If the second parameter is true, only tests if the file
+        // should be uploaded in chunks, but does not invoke any
+        // upload requests:
+        _chunkedUpload: function (options, testOnly) {
+            var that = this,
+                file = options.files[0],
+                fs = file.size,
+                ub = options.uploadedBytes = options.uploadedBytes || 0,
+                mcs = options.maxChunkSize || fs,
+                // Use the Blob methods with the slice implementation
+                // according to the W3C Blob API specification:
+                slice = file.webkitSlice || file.mozSlice || file.slice,
+                upload,
+                n,
+                jqXHR,
+                pipe;
+            if (!(this._isXHRUpload(options) && slice && (ub || mcs < fs)) ||
+                    options.data) {
+                return false;
+            }
+            if (testOnly) {
+                return true;
+            }
+            if (ub >= fs) {
+                file.error = 'uploadedBytes';
+                return this._getXHRPromise(
+                    false,
+                    options.context,
+                    [null, 'error', file.error]
+                );
+            }
+            // n is the number of blobs to upload,
+            // calculated via filesize, uploaded bytes and max chunk size:
+            n = Math.ceil((fs - ub) / mcs);
+            // The chunk upload method accepting the chunk number as parameter:
+            upload = function (i) {
+                if (!i) {
+                    return that._getXHRPromise(true, options.context);
+                }
+                // Upload the blobs in sequential order:
+                return upload(i -= 1).pipe(function () {
+                    // Clone the options object for each chunk upload:
+                    var o = $.extend({}, options);
+                    o.blob = slice.call(
+                        file,
+                        ub + i * mcs,
+                        ub + (i + 1) * mcs
+                    );
+                    // Store the current chunk size, as the blob itself
+                    // will be dereferenced after data processing:
+                    o.chunkSize = o.blob.size;
+                    // Process the upload data (the blob and potential form data):
+                    that._initXHRData(o);
+                    // Add progress listeners for this chunk upload:
+                    that._initProgressListener(o);
+                    jqXHR = ($.ajax(o) || that._getXHRPromise(false, o.context))
+                        .done(function () {
+                            // Create a progress event if upload is done and
+                            // no progress event has been invoked for this chunk:
+                            if (!o.loaded) {
+                                that._onProgress($.Event('progress', {
+                                    lengthComputable: true,
+                                    loaded: o.chunkSize,
+                                    total: o.chunkSize
+                                }), o);
+                            }
+                            options.uploadedBytes = o.uploadedBytes +=
+                                o.chunkSize;
+                        });
+                    return jqXHR;
+                });
+            };
+            // Return the piped Promise object, enhanced with an abort method,
+            // which is delegated to the jqXHR object of the current upload,
+            // and jqXHR callbacks mapped to the equivalent Promise methods:
+            pipe = upload(n);
+            pipe.abort = function () {
+                return jqXHR.abort();
+            };
+            return this._enhancePromise(pipe);
+        },
+
+        _beforeSend: function (e, data) {
+            if (this._active === 0) {
+                // the start callback is triggered when an upload starts
+                // and no other uploads are currently running,
+                // equivalent to the global ajaxStart event:
+                this._trigger('start');
+            }
+            this._active += 1;
+            // Initialize the global progress values:
+            this._loaded += data.uploadedBytes || 0;
+            this._total += this._getTotal(data.files);
+        },
+
+        _onDone: function (result, textStatus, jqXHR, options) {
+            if (!this._isXHRUpload(options)) {
+                // Create a progress event for each iframe load:
+                this._onProgress($.Event('progress', {
+                    lengthComputable: true,
+                    loaded: 1,
+                    total: 1
+                }), options);
+            }
+            options.result = result;
+            options.textStatus = textStatus;
+            options.jqXHR = jqXHR;
+            this._trigger('done', null, options);
+        },
+
+        _onFail: function (jqXHR, textStatus, errorThrown, options) {
+            options.jqXHR = jqXHR;
+            options.textStatus = textStatus;
+            options.errorThrown = errorThrown;
+            this._trigger('fail', null, options);
+            if (options.recalculateProgress) {
+                // Remove the failed (error or abort) file upload from
+                // the global progress calculation:
+                this._loaded -= options.loaded || options.uploadedBytes || 0;
+                this._total -= options.total || this._getTotal(options.files);
+            }
+        },
+
+        _onAlways: function (jqXHRorResult, textStatus, jqXHRorError, options) {
+            this._active -= 1;
+            options.textStatus = textStatus;
+            if (jqXHRorError && jqXHRorError.always) {
+                options.jqXHR = jqXHRorError;
+                options.result = jqXHRorResult;
+            } else {
+                options.jqXHR = jqXHRorResult;
+                options.errorThrown = jqXHRorError;
+            }
+            this._trigger('always', null, options);
+            if (this._active === 0) {
+                // The stop callback is triggered when all uploads have
+                // been completed, equivalent to the global ajaxStop event:
+                this._trigger('stop');
+                // Reset the global progress values:
+                this._loaded = this._total = 0;
+            }
+        },
+
+        _onSend: function (e, data) {
+            var that = this,
+                jqXHR,
+                slot,
+                pipe,
+                options = that._getAJAXSettings(data),
+                send = function (resolve, args) {
+                    that._sending += 1;
+                    jqXHR = jqXHR || (
+                        (resolve !== false &&
+                        that._trigger('send', e, options) !== false &&
+                        (that._chunkedUpload(options) || $.ajax(options))) ||
+                        that._getXHRPromise(false, options.context, args)
+                    ).done(function (result, textStatus, jqXHR) {
+                        that._onDone(result, textStatus, jqXHR, options);
+                    }).fail(function (jqXHR, textStatus, errorThrown) {
+                        that._onFail(jqXHR, textStatus, errorThrown, options);
+                    }).always(function (jqXHRorResult, textStatus, jqXHRorError) {
+                        that._sending -= 1;
+                        that._onAlways(
+                            jqXHRorResult,
+                            textStatus,
+                            jqXHRorError,
+                            options
+                        );
+                        if (options.limitConcurrentUploads &&
+                                options.limitConcurrentUploads > that._sending) {
+                            // Start the next queued upload,
+                            // that has not been aborted:
+                            var nextSlot = that._slots.shift();
+                            while (nextSlot) {
+                                if (!nextSlot.isRejected()) {
+                                    nextSlot.resolve();
+                                    break;
+                                }
+                                nextSlot = that._slots.shift();
+                            }
+                        }
+                    });
+                    return jqXHR;
+                };
+            this._beforeSend(e, options);
+            if (this.options.sequentialUploads ||
+                    (this.options.limitConcurrentUploads &&
+                    this.options.limitConcurrentUploads <= this._sending)) {
+                if (this.options.limitConcurrentUploads > 1) {
+                    slot = $.Deferred();
+                    this._slots.push(slot);
+                    pipe = slot.pipe(send);
+                } else {
+                    pipe = (this._sequence = this._sequence.pipe(send, send));
+                }
+                // Return the piped Promise object, enhanced with an abort method,
+                // which is delegated to the jqXHR object of the current upload,
+                // and jqXHR callbacks mapped to the equivalent Promise methods:
+                pipe.abort = function () {
+                    var args = [undefined, 'abort', 'abort'];
+                    if (!jqXHR) {
+                        if (slot) {
+                            slot.rejectWith(args);
+                        }
+                        return send(false, args);
+                    }
+                    return jqXHR.abort();
+                };
+                return this._enhancePromise(pipe);
+            }
+            return send();
+        },
+
+        _onAdd: function (e, data) {
+            var that = this,
+                result = true,
+                options = $.extend({}, this.options, data),
+                limit = options.limitMultiFileUploads,
+                fileSet,
+                i;
+            if (!(options.singleFileUploads || limit) ||
+                    !this._isXHRUpload(options)) {
+                fileSet = [data.files];
+            } else if (!options.singleFileUploads && limit) {
+                fileSet = [];
+                for (i = 0; i < data.files.length; i += limit) {
+                    fileSet.push(data.files.slice(i, i + limit));
+                }
+            }
+            data.originalFiles = data.files;
+            $.each(fileSet || data.files, function (index, element) {
+                var files = fileSet ? element : [element],
+                    newData = $.extend({}, data, {files: files});
+                newData.submit = function () {
+                    newData.jqXHR = this.jqXHR =
+                        (that._trigger('submit', e, this) !== false) &&
+                        that._onSend(e, this);
+                    return this.jqXHR;
+                };
+                return (result = that._trigger('add', e, newData));
+            });
+            return result;
+        },
+
+        // File Normalization for Gecko 1.9.1 (Firefox 3.5) support:
+        _normalizeFile: function (index, file) {
+            if (file.name === undefined && file.size === undefined) {
+                file.name = file.fileName;
+                file.size = file.fileSize;
+            }
+        },
+
+        _replaceFileInput: function (input) {
+            var inputClone = input.clone(true);
+            $('<form></form>').append(inputClone)[0].reset();
+            // Detaching allows to insert the fileInput on another form
+            // without loosing the file input value:
+            input.after(inputClone).detach();
+            // Avoid memory leaks with the detached file input:
+            $.cleanData(input.unbind('remove'));
+            // Replace the original file input element in the fileInput
+            // collection with the clone, which has been copied including
+            // event handlers:
+            this.options.fileInput = this.options.fileInput.map(function (i, el) {
+                if (el === input[0]) {
+                    return inputClone[0];
+                }
+                return el;
+            });
+            // If the widget has been initialized on the file input itself,
+            // override this.element with the file input clone:
+            if (input[0] === this.element[0]) {
+                this.element = inputClone;
+            }
+        },
+
+        _onChange: function (e) {
+            var that = e.data.fileupload,
+                data = {
+                    files: $.each($.makeArray(e.target.files), that._normalizeFile),
+                    fileInput: $(e.target),
+                    form: $(e.target.form)
+                };
+            if (!data.files.length) {
+                // If the files property is not available, the browser does not
+                // support the File API and we add a pseudo File object with
+                // the input value as name with path information removed:
+                data.files = [{name: e.target.value.replace(/^.*\\/, '')}];
+            }
+            if (that.options.replaceFileInput) {
+                that._replaceFileInput(data.fileInput);
+            }
+            if (that._trigger('change', e, data) === false ||
+                    that._onAdd(e, data) === false) {
+                return false;
+            }
+        },
+
+        _onPaste: function (e) {
+            var that = e.data.fileupload,
+                cbd = e.originalEvent.clipboardData,
+                items = (cbd && cbd.items) || [],
+                data = {files: []};
+            $.each(items, function (index, item) {
+                var file = item.getAsFile && item.getAsFile();
+                if (file) {
+                    data.files.push(file);
+                }
+            });
+            if (that._trigger('paste', e, data) === false ||
+                    that._onAdd(e, data) === false) {
+                return false;
+            }
+        },
+
+        _onDrop: function (e) {
+            var that = e.data.fileupload,
+                dataTransfer = e.dataTransfer = e.originalEvent.dataTransfer,
+                data = {
+                    files: $.each(
+                        $.makeArray(dataTransfer && dataTransfer.files),
+                        that._normalizeFile
+                    )
+                };
+            if (that._trigger('drop', e, data) === false ||
+                    that._onAdd(e, data) === false) {
+                return false;
+            }
+            e.preventDefault();
+        },
+
+        _onDragOver: function (e) {
+            var that = e.data.fileupload,
+                dataTransfer = e.dataTransfer = e.originalEvent.dataTransfer;
+            if (that._trigger('dragover', e) === false) {
+                return false;
+            }
+            if (dataTransfer) {
+                dataTransfer.dropEffect = dataTransfer.effectAllowed = 'copy';
+            }
+            e.preventDefault();
+        },
+
+        _initEventHandlers: function () {
+            var ns = this.options.namespace;
+            if (this._isXHRUpload(this.options)) {
+                this.options.dropZone
+                    .bind('dragover.' + ns, {fileupload: this}, this._onDragOver)
+                    .bind('drop.' + ns, {fileupload: this}, this._onDrop)
+                    .bind('paste.' + ns, {fileupload: this}, this._onPaste);
+            }
+            this.options.fileInput
+                .bind('change.' + ns, {fileupload: this}, this._onChange);
+        },
+
+        _destroyEventHandlers: function () {
+            var ns = this.options.namespace;
+            this.options.dropZone
+                .unbind('dragover.' + ns, this._onDragOver)
+                .unbind('drop.' + ns, this._onDrop)
+                .unbind('paste.' + ns, this._onPaste);
+            this.options.fileInput
+                .unbind('change.' + ns, this._onChange);
+        },
+
+        _setOption: function (key, value) {
+            var refresh = $.inArray(key, this._refreshOptionsList) !== -1;
+            if (refresh) {
+                this._destroyEventHandlers();
+            }
+            $.Widget.prototype._setOption.call(this, key, value);
+            if (refresh) {
+                this._initSpecialOptions();
+                this._initEventHandlers();
+            }
+        },
+
+        _initSpecialOptions: function () {
+            var options = this.options;
+            if (options.fileInput === undefined) {
+                options.fileInput = this.element.is('input:file') ?
+                        this.element : this.element.find('input:file');
+            } else if (!(options.fileInput instanceof $)) {
+                options.fileInput = $(options.fileInput);
+            }
+            if (!(options.dropZone instanceof $)) {
+                options.dropZone = $(options.dropZone);
+            }
+        },
+
+        _create: function () {
+            var options = this.options,
+                dataOpts = $.extend({}, this.element.data());
+            dataOpts[this.widgetName] = undefined;
+            $.extend(options, dataOpts);
+            options.namespace = options.namespace || this.widgetName;
+            this._initSpecialOptions();
+            this._slots = [];
+            this._sequence = this._getXHRPromise(true);
+            this._sending = this._active = this._loaded = this._total = 0;
+            this._initEventHandlers();
+        },
+
+        destroy: function () {
+            this._destroyEventHandlers();
+            $.Widget.prototype.destroy.call(this);
+        },
+
+        enable: function () {
+            $.Widget.prototype.enable.call(this);
+            this._initEventHandlers();
+        },
+
+        disable: function () {
+            this._destroyEventHandlers();
+            $.Widget.prototype.disable.call(this);
+        },
+
+        // This method is exposed to the widget API and allows adding files
+        // using the fileupload API. The data parameter accepts an object which
+        // must have a files property and can contain additional options:
+        // .fileupload('add', {files: filesList});
+        add: function (data) {
+            if (!data || this.options.disabled) {
+                return;
+            }
+            data.files = $.each($.makeArray(data.files), this._normalizeFile);
+            this._onAdd(null, data);
+        },
+
+        // This method is exposed to the widget API and allows sending files
+        // using the fileupload API. The data parameter accepts an object which
+        // must have a files property and can contain additional options:
+        // .fileupload('send', {files: filesList});
+        // The method returns a Promise object for the file upload call.
+        send: function (data) {
+            if (data && !this.options.disabled) {
+                data.files = $.each($.makeArray(data.files), this._normalizeFile);
+                if (data.files.length) {
+                    return this._onSend(null, data);
+                }
+            }
+            return this._getXHRPromise(false, data && data.context);
+        }
+
+    });
+
+}));
diff --git a/files/js/jquery.iframe-transport.js b/files/js/jquery.iframe-transport.js
new file mode 100644
index 00000000000..d85c0c11297
--- /dev/null
+++ b/files/js/jquery.iframe-transport.js
@@ -0,0 +1,165 @@
+/*
+ * jQuery Iframe Transport Plugin 1.3
+ * https://github.com/blueimp/jQuery-File-Upload
+ *
+ * Copyright 2011, Sebastian Tschan
+ * https://blueimp.net
+ *
+ * Licensed under the MIT license:
+ * http://www.opensource.org/licenses/MIT
+ */
+
+/*jslint unparam: true, nomen: true */
+/*global define, window, document */
+
+(function (factory) {
+    'use strict';
+    if (typeof define === 'function' && define.amd) {
+        // Register as an anonymous AMD module:
+        define(['jquery'], factory);
+    } else {
+        // Browser globals:
+        factory(window.jQuery);
+    }
+}(function ($) {
+    'use strict';
+
+    // Helper variable to create unique names for the transport iframes:
+    var counter = 0;
+
+    // The iframe transport accepts three additional options:
+    // options.fileInput: a jQuery collection of file input fields
+    // options.paramName: the parameter name for the file form data,
+    //  overrides the name property of the file input field(s)
+    // options.formData: an array of objects with name and value properties,
+    //  equivalent to the return data of .serializeArray(), e.g.:
+    //  [{name: 'a', value: 1}, {name: 'b', value: 2}]
+    $.ajaxTransport('iframe', function (options) {
+        if (options.async && (options.type === 'POST' || options.type === 'GET')) {
+            var form,
+                iframe;
+            return {
+                send: function (_, completeCallback) {
+                    form = $('<form style="display:none;"></form>');
+                    // javascript:false as initial iframe src
+                    // prevents warning popups on HTTPS in IE6.
+                    // IE versions below IE8 cannot set the name property of
+                    // elements that have already been added to the DOM,
+                    // so we set the name along with the iframe HTML markup:
+                    iframe = $(
+                        '<iframe src="javascript:false;" name="iframe-transport-' +
+                            (counter += 1) + '"></iframe>'
+                    ).bind('load', function () {
+                        var fileInputClones;
+                        iframe
+                            .unbind('load')
+                            .bind('load', function () {
+                                var response;
+                                // Wrap in a try/catch block to catch exceptions thrown
+                                // when trying to access cross-domain iframe contents:
+                                try {
+                                    response = iframe.contents();
+                                    // Google Chrome and Firefox do not throw an
+                                    // exception when calling iframe.contents() on
+                                    // cross-domain requests, so we unify the response:
+                                    if (!response.length || !response[0].firstChild) {
+                                        throw new Error();
+                                    }
+                                } catch (e) {
+                                    response = undefined;
+                                }
+                                // The complete callback returns the
+                                // iframe content document as response object:
+                                completeCallback(
+                                    200,
+                                    'success',
+                                    {'iframe': response}
+                                );
+                                // Fix for IE endless progress bar activity bug
+                                // (happens on form submits to iframe targets):
+                                $('<iframe src="javascript:false;"></iframe>')
+                                    .appendTo(form);
+                                form.remove();
+                            });
+                        form
+                            .prop('target', iframe.prop('name'))
+                            .prop('action', options.url)
+                            .prop('method', options.type);
+                        if (options.formData) {
+                            $.each(options.formData, function (index, field) {
+                                $('<input type="hidden"/>')
+                                    .prop('name', field.name)
+                                    .val(field.value)
+                                    .appendTo(form);
+                            });
+                        }
+                        if (options.fileInput && options.fileInput.length &&
+                                options.type === 'POST') {
+                            fileInputClones = options.fileInput.clone();
+                            // Insert a clone for each file input field:
+                            options.fileInput.after(function (index) {
+                                return fileInputClones[index];
+                            });
+                            if (options.paramName) {
+                                options.fileInput.each(function () {
+                                    $(this).prop('name', options.paramName);
+                                });
+                            }
+                            // Appending the file input fields to the hidden form
+                            // removes them from their original location:
+                            form
+                                .append(options.fileInput)
+                                .prop('enctype', 'multipart/form-data')
+                                // enctype must be set as encoding for IE:
+                                .prop('encoding', 'multipart/form-data');
+                        }
+                        form.submit();
+                        // Insert the file input fields at their original location
+                        // by replacing the clones with the originals:
+                        if (fileInputClones && fileInputClones.length) {
+                            options.fileInput.each(function (index, input) {
+                                var clone = $(fileInputClones[index]);
+                                $(input).prop('name', clone.prop('name'));
+                                clone.replaceWith(input);
+                            });
+                        }
+                    });
+                    form.append(iframe).appendTo(document.body);
+                },
+                abort: function () {
+                    if (iframe) {
+                        // javascript:false as iframe src aborts the request
+                        // and prevents warning popups on HTTPS in IE6.
+                        // concat is used to avoid the "Script URL" JSLint error:
+                        iframe
+                            .unbind('load')
+                            .prop('src', 'javascript'.concat(':false;'));
+                    }
+                    if (form) {
+                        form.remove();
+                    }
+                }
+            };
+        }
+    });
+
+    // The iframe transport returns the iframe content document as response.
+    // The following adds converters from iframe to text, json, html, and script:
+    $.ajaxSetup({
+        converters: {
+            'iframe text': function (iframe) {
+                return $(iframe[0].body).text();
+            },
+            'iframe json': function (iframe) {
+                return $.parseJSON($(iframe[0].body).text());
+            },
+            'iframe html': function (iframe) {
+                return $(iframe[0].body).html();
+            },
+            'iframe script': function (iframe) {
+                return $.globalEval($(iframe[0].body).text());
+            }
+        }
+    });
+
+}));