Resumable upload

README.md

@@ -1,4 +1,4 @@
-# FileAPI — a set of tools for working with files.
+# FileAPI — a set of tools for working with files.
 
 
 <p align="center">
@@ -220,7 +220,7 @@ function onDrop(evt){
 
 var el = document.getElementById('el');
 FileAPI.event.dnd(el, function (over/**Boolean*/, evt/**Event*/){
-	el.style.background = ever ? 'red' : '';
+	el.style.background = over ? 'red' : '';
 }, function (files/**Array*/, evt/**Event*/){
 	// ...
 });

lib/FileAPI.Flash.js

@@ -1,4 +1,4 @@
-/**
+/**
  * FileAPI fallback to Flash
  *
  * @flash-developer  "Vladimer Demidov" <v.demidov@corp.mail.ru>

lib/FileAPI.Form.js

@@ -35,6 +35,10 @@
 				api.log('FileAPI.Form.toMultipartData');
 				this.toMultipartData(fn);
 			}
+			else if( options.resumable && api.support.resumable ){
+				api.log('FileAPI.Form.toMultipartData');
+				this.toPlainData(fn);
+			}
 			else {
 				api.log('FileAPI.Form.toFormData');
 				this.toFormData(fn);
@@ -74,6 +78,19 @@
 			});
 		},
 
+		toPlainData: function (fn){
+			this._to({}, fn, function (file, data, queue){
+				if( file.file ){
+					data.type = file.file;
+				}
+				data.name = file.blob.name;
+				data.file =  file.blob;
+				data.size =  file.blob.size;
+				data.start = 0;
+				data.end = 0;
+				data.retry = 0;
+			});
+		},
 
 		toFormData: function (fn){
 			this._to(new FormData, fn, function (file, data, queue){

lib/FileAPI.XHR.js

@@ -65,7 +65,7 @@
 				// Start uploading
 				options.upload(options, _this);
 				_this._send.call(_this, options, data);
-			});
+			}, options);
 		},
 
 		_send: function (options, data){
@@ -77,6 +77,7 @@
 			url += (~url.indexOf('?') ? '&' : '?') + api.uid();
 
 			if( data.nodeName ){
+				// legacy
 				options.upload(options, _this);
 
 				xhr = document.createElement('div');
@@ -125,6 +126,7 @@
 				form = null;
 			}
 			else {
+				// html5
 				xhr = _this.xhr = api.getXHR();
 
 				xhr.open('POST', url, true);
@@ -138,46 +140,114 @@
 					xhr.setRequestHeader(key, val);
 				});
 
-				if( xhr.upload ){
-					// https://github.com/blueimp/jQuery-File-Upload/wiki/Fixing-Safari-hanging-on-very-high-speed-connections-%281Gbps%29
-					xhr.upload.addEventListener('progress', api.throttle(function (/**Event*/evt){
-						options.progress(evt, _this, options);
-					}, 100), false);
-				}
-
-				xhr.onreadystatechange = function (){
-					_this.status     = xhr.status;
-					_this.statusText = xhr.statusText;
-					_this.readyState = xhr.readyState;
+
+				if (options.resumable && api.support.resumable) {
+					// resumable upload
+					if( xhr.upload ){
+						// https://github.com/blueimp/jQuery-File-Upload/wiki/Fixing-Safari-hanging-on-very-high-speed-connections-%281Gbps%29
+						xhr.upload.addEventListener('progress', api.throttle(function (/**Event*/evt){
+							var e = jQuery.extend({}, evt, {
+								loaded : data.start + evt.loaded,
+								totalSize : data.size,
+								total : data.size});
+							options.progress(e, _this, options);
+						}, 100), false);
+					}
 
-					if( xhr.readyState == 4 ){
-						for( var k in { '': 1, XML: 1, Text: 1, Body: 1 } ){
-							_this['response'+k]  = xhr['response'+k];
+					xhr.onreadystatechange = function (){
+						_this.status     = xhr.status;
+						_this.statusText = xhr.statusText;
+						_this.readyState = xhr.readyState;
+
+						if( xhr.readyState == 4 ){
+							for( var k in { '': 1, XML: 1, Text: 1, Body: 1 } ){
+								_this['response'+k]  = xhr['response'+k];
+							}
+							xhr.onreadystatechange = null;
+
+							if (xhr.status - 201 > 0) {
+								// some kind of error
+								if (++data.retry <= api.resumableRetryCount && (500 == xhr.status || 416 == xhr.status)) {
+									// let's try again the same chunk
+									// only applicable for recoverable error codes 500 && 416 
+									data.end = data.start
+									_this._send(options, data);
+								} else {
+									// no mo retries
+									_this.end(xhr.status);
+								}
+							} else {
+								// success
+								data.retry = 0;
+
+								if (data.end == data.size - 1) {
+									// finished
+									_this.end(xhr.status);
+								} else {
+									// next chunk
+									_this._send(options, data);
+								}
+							}
+							xhr = null;
 						}
-						xhr.onreadystatechange = null;
-						_this.end(xhr.status);
-						xhr = null;
+					};
+
+					data.start = data.end;
+					data.end = Math.min(data.end + api.resumableChunk, data.size ) - 1;
+
+					var slice;
+					(slice = 'slice') in data.file || (slice = 'mozSlice') in data.file || (slice = 'webkitSlice') in data.file;
+
+					xhr.setRequestHeader("Content-Range", "bytes " + data.start + "-" + data.end + "/" + data.size);
+					xhr.setRequestHeader("Content-Disposition", 'attachment; filename=' + data.name);
+
+					slice = data.file[slice](data.start, data.end + 1);
+
+					xhr.send(slice);
+					slice = null;
+				} else {
+					// single piece upload
+					if( xhr.upload ){
+						// https://github.com/blueimp/jQuery-File-Upload/wiki/Fixing-Safari-hanging-on-very-high-speed-connections-%281Gbps%29
+						xhr.upload.addEventListener('progress', api.throttle(function (/**Event*/evt){
+							options.progress(evt, _this, options);
+						}, 100), false);
 					}
-				};
+
+					xhr.onreadystatechange = function (){
+						_this.status     = xhr.status;
+						_this.statusText = xhr.statusText;
+						_this.readyState = xhr.readyState;
+
+						if( xhr.readyState == 4 ){
+							for( var k in { '': 1, XML: 1, Text: 1, Body: 1 } ){
+								_this['response'+k]  = xhr['response'+k];
+							}
+							xhr.onreadystatechange = null;
+							_this.end(xhr.status);
+							xhr = null;
+						}
+					};
 
-				if( api.isArray(data) ){
-					// multipart
-					xhr.setRequestHeader('Content-Type', 'multipart/form-data; boundary=_'+api.expando);
-					data = data.join('') +'--_'+ api.expando +'--';
+					if( api.isArray(data) ){
+						// multipart
+						xhr.setRequestHeader('Content-Type', 'multipart/form-data; boundary=_'+api.expando);
+						data = data.join('') +'--_'+ api.expando +'--';
 
-					/** @namespace  xhr.sendAsBinary  https://developer.mozilla.org/ru/XMLHttpRequest#Sending_binary_content */
-					if( xhr.sendAsBinary ){
-						xhr.sendAsBinary(data);
-					}
-					else {
-						var bytes = Array.prototype.map.call(data, function(c){ return c.charCodeAt(0) & 0xff; });
-						xhr.send(new Uint8Array(bytes).buffer);
+						/** @namespace  xhr.sendAsBinary  https://developer.mozilla.org/ru/XMLHttpRequest#Sending_binary_content */
+						if( xhr.sendAsBinary ){
+							xhr.sendAsBinary(data);
+						}
+						else {
+							var bytes = Array.prototype.map.call(data, function(c){ return c.charCodeAt(0) & 0xff; });
+							xhr.send(new Uint8Array(bytes).buffer);
 
+						}
+					} else {
+						// FormData 
+						xhr.send(data);
 					}
 				}
-				else {
-					xhr.send(data);
-				}
 			}
 		}
 	};

lib/FileAPI.core.js

@@ -20,6 +20,8 @@
 				&& !(/safari\//.test(userAgent) && /windows/i.test(userAgent)), // BugFix: https://github.com/mailru/FileAPI/issues/25
 
 		cors = html5 && ('withCredentials' in (new XMLHttpRequest)),
+
+		resumable = html5 && !!Blob && !!(Blob.prototype.webkitSlice||Blob.prototype.mozSlice||Blob.prototype.slice),
 
 		document = window.document,
 
@@ -58,6 +60,9 @@
 
 			flashUrl: 0, // @default: './FileAPI.flash.swf'
 			flashImageUrl: 0, // @default: './FileAPI.flash.image.swf'
+
+			resumableChunk : 500 * _KB,
+			resumableRetryCount : 3,
 
 			KB: _KB,
 			MB: _pow(_KB, 2),
@@ -103,6 +108,7 @@
 				dnd:     cors && ('ondrop' in document.createElement('div')),
 				cors:    cors,
 				html5:   html5,
+				resumable:   resumable,
 				dataURI: true
 			},
 
@@ -747,7 +753,6 @@
 
 				// emit "beforeupload"  event
 				options.beforeupload(proxyXHR, options);
-
 				// Upload by file
 				(function _nextFile(){
 					var