/elements/upload/resources/Main.as

/**
 * Swiff.Uploader
 *
 * Credits: A lot of good parts are inspired by the awesome www.swfupload.org
 *
 * @licence     MIT Licence
 *
 * @author      Harald Kirschner <http://digitarald.de>
 * @author      Anders Rasmussen <aras@dr.dk>
 * @author      Valerio Proietti, <http://mad4milk.net>
 * @author      Mike de Boer <mike AT ajax DOT org>
 * @copyright   Authors
 */

package
{
    import flash.display.Sprite;
    import flash.display.StageAlign;
    import flash.display.StageScaleMode;
    import flash.display.MovieClip;
    
    import flash.display.Loader;
    
    import flash.events.*;
    import flash.utils.*;
    
    import flash.system.Security;

    import flash.net.FileReference;
    import flash.net.FileReferenceList;
    import flash.net.FileFilter;
    
    import flash.net.URLRequest;

    import flash.external.ExternalInterface;
    
    import flash.text.AntiAliasType;
    import flash.text.GridFitType;
    import flash.text.StaticText;
    import flash.text.StyleSheet;
    import flash.text.TextDisplayMode;
    import flash.text.TextField;
    import flash.text.TextFieldType;
    import flash.text.TextFieldAutoSize;
    import flash.text.TextFormat;

    import Escaper;
    
    import File;
    
    public class Main extends Sprite
    {

        public var options:Object = {
            typeFilter: null,
            typeFilterDescription: null,
            multiple: null,
            queued: null,
            verbose: false,
            width: 128,
            height: 32,
            passStatus: null,
            
            url: null,
            method: null,
            data: null,
            mergeData: null,
            fieldName: null,
            progressGraphSize: 10,
            
            fileSizeMin: 1,
            fileSizeMax: null,// Official 100 MB limit for FileReference
            allowDuplicates: false,
            timeLimit: null,
            
            policyFile: null,
            buttonImage: null
        };
        
        public var fileList:Array = new Array();
        public var uploading:uint = 0;
        
        public var size:uint = 0;
        public var bytesLoaded:uint = 0;
        public var rate:uint = 0;
        
        public var playerID:String;
        
        private var dialog:*= null;
        
        private var buttonLoader:Loader;
        private var buttonCursorSprite:Sprite;
        
        private var buttonState:uint = 0;
        
        public const BUTTON_STATE_OVER:uint = 1;
        public const BUTTON_STATE_DOWN:uint = 2;
        public const BUTTON_STATE_DISABLED:uint = 4;
    
        public function Main():void
        {
            playerID = loaderInfo.parameters.playerID;
            if (stage)
                init();
            else
                addEventListener(Event.ADDED_TO_STAGE, init);
        }
        
        private function init(e:Event = null):void
        {
            removeEventListener(Event.ADDED_TO_STAGE, init);
            
            if (!flash.net.FileReference || !flash.external.ExternalInterface || !flash.external.ExternalInterface.available)
                return;
            
            // allow uploading to any domain
            Security.allowDomain("*");
            
            // ExternalInterface callback adding copied
            ExternalInterface.addCallback('initialize', xInitialize);
            ExternalInterface.addCallback('setOptions', xSetOptions);
            
            ExternalInterface.addCallback('startUpload', xStart);
            ExternalInterface.addCallback('stopUpload', xStop);
            ExternalInterface.addCallback('remove', xRemove);
            
            ExternalInterface.addCallback('setEnabled', xSetEnabled);
            
            ExternalInterface.addCallback('fileSetOptions', xFileSetOptions);
            ExternalInterface.addCallback('fileStart', xFileStart);
            ExternalInterface.addCallback('fileStop', xFileStop);
            ExternalInterface.addCallback('fileRemove', xFileRemove);
            ExternalInterface.addCallback('fileRequeue', xFileRequeue);
            
            fireEvent('load');
        }
        
        public function fireEvent(functionName:String, args:* = null):void
        {
            verboseLog('Main::fireEvent "' + functionName + '"', args);
            
            if (args !== null) {
                if (args is Array) args = Escaper.escapeArray(args);
                else args = [Escaper.escape(args)];
            }
            
            ExternalInterface.call('apf.flash.callMethod', this.playerID || 1, 'event', functionName, args || []);
        }
        
        private function empty(fake:* = null):void
        {}
        
        // External Interface - JS to Flash - calls
        
        private function xInitialize(options_override:Object = null):void
        {
            xSetOptions(options_override);
            
            // Make the stage clickable and transparent.
            stage.align = StageAlign.TOP_LEFT;
            stage.scaleMode = StageScaleMode.NO_SCALE;
            
            stage.addEventListener(MouseEvent.CLICK, stageClick);
            stage.addEventListener(MouseEvent.MOUSE_DOWN, stageMouse);
            stage.addEventListener(MouseEvent.MOUSE_UP, stageMouse);
            stage.addEventListener(MouseEvent.MOUSE_OVER, stageMouse);
            stage.addEventListener(MouseEvent.MOUSE_OUT, stageMouse);
            stage.addEventListener(Event.MOUSE_LEAVE, stageLeave);
            stage.addEventListener(Event.RESIZE, stageResize);
            
            
            buttonLoader = new Loader();
            buttonLoader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, empty);
            buttonLoader.contentLoaderInfo.addEventListener(HTTPStatusEvent.HTTP_STATUS, empty);
            
            stage.addChild(buttonLoader);
            
            buttonCursorSprite = new Sprite();
            buttonCursorSprite.graphics.beginFill(0xFFFFFF, 0.1);
            buttonCursorSprite.graphics.drawRect(0, 0, 1, 1);
            buttonCursorSprite.graphics.endFill();
            buttonCursorSprite.buttonMode = true;
            buttonCursorSprite.useHandCursor = true;
            buttonCursorSprite.x = 0;
            buttonCursorSprite.y = 0;
            buttonCursorSprite.addEventListener(MouseEvent.CLICK, empty);
            
            stage.addChild(buttonCursorSprite);
            
            initButton();
            
            verboseLog('initialized, ' + fileList.length);
        }
        
        private function xSetOptions(options_override:Object = null):void
        {
            if (options_override === null) return;
            for (var prop:String in options) {
                if (options_override.hasOwnProperty(prop)) {
                    switch (prop) {
                        case 'policyFile':
                            if (options_override[prop] is String)
                                Security.loadPolicyFile(options_override[prop]);
                            break;
                    }
                    options[prop] = options_override[prop];
                }
            }
        }
        
        private function xFileSetOptions(id:uint, options_init:Object = null):Boolean
        {
            var ref:File = getFileById(id);
            if (!ref) return false;
            
            ref.setOptions(options_init);
            return true;
        }
        
        private function xFileStart(id:uint):Boolean
        {
            var ref:File = getFileById(id);
            if (!ref) return false;
            
            return ref.start();
        }
        
        private function xFileStop(id:uint):Boolean
        {
            var ref:File = getFileById(id);
            if (!ref) return false;
            
            return ref.stop();
        }
        
        private function xFileRemove(id:uint):Boolean
        {
            var ref:File = getFileById(id);
            if (!ref) return false;
            
            return ref.remove();
        }
        
        public function queueUpdate():Object
        {
            return {
                uploading: uploading,
                size: size,
                bytesLoaded: bytesLoaded,
                percentLoaded: (size > 0) ? Math.ceil(bytesLoaded / size * 100) : 0,
                rate: rate
            };
        }
        
        private function xFileRequeue(id:uint):Boolean
        {
            var ref:File = getFileById(id);
            if (!ref) return false;
                                    
            return ref.requeue();
        }
        
        private function xStart():void
        {
            if (uploading) return;
            checkQueue();
            if (uploading)
                fireEvent('start');
        }
        
        private function xSetEnabled(status:* = null):void
        {
            if (status == null) status = !(buttonState & BUTTON_STATE_DISABLED);
            
            if (status)
                buttonState = buttonState &~ BUTTON_STATE_DISABLED;
            else
                buttonState = buttonState | BUTTON_STATE_DISABLED;
            
            buttonCursorSprite.useHandCursor = status;
            
            updateButton();
        }
        
        private function xStop():void
        {
            for (var i:uint = fileList.length - 1; i > 0; i--) {
                if (fileList[i].status != File.STATUS_RUNNING) continue;
                fileList[i].stop();
            }
        }
        
        private function xRemove():void
        {
            while (fileList.length) {
                fileList[0].remove();
            }
        }
        
        public function checkQueue(eventful:Boolean = false):void
        {
            var queued:uint = (options.queued) ? ((options.queued > 1) ? options.queued : 1) : 0;
            
            if (uploading && queued && uploading >= queued) return;
            
            var length:uint = fileList.length;
            
            for (var i:uint = 0; i < length; i++) {
                if (fileList[i].status != File.STATUS_QUEUED) continue;
                fileList[i].start();
                if (queued && uploading >= queued) break;
            }
            
            if (!uploading && eventful)
                fireEvent('complete', [queueUpdate()]);
        }
        
        private function stageClick(e:MouseEvent):void
        {
            if (buttonState & BUTTON_STATE_DISABLED) {
                fireEvent('disabledBrowse');
                return;
            }
            
            browse();
        }
        
        private function stageLeave(e:Event):void
        {
            buttonState = buttonState &~ BUTTON_STATE_DOWN;
            buttonState = buttonState &~ BUTTON_STATE_OVER;
            
            updateButton();
        }
        
        private function stageResize(e:Event):void
        {
            updateSize();
        }
        
        private function stageMouse(e:MouseEvent):void
        {
            switch (e.type) {
                case MouseEvent.MOUSE_DOWN:
                    if (e.buttonDown)
                        buttonState = buttonState | BUTTON_STATE_DOWN;
                    break;
                case MouseEvent.MOUSE_UP:
                    buttonState = buttonState &~ BUTTON_STATE_DOWN;
                    break;
                case MouseEvent.MOUSE_OVER:
                    buttonState = buttonState | BUTTON_STATE_OVER;
                    break;
                case MouseEvent.MOUSE_OUT:
                    buttonState = buttonState &~ BUTTON_STATE_OVER;
            }
            
            updateButton();
        }
        
        private function updateSize():void
        {
            buttonCursorSprite.width = stage.stageWidth;
            buttonCursorSprite.height = stage.stageHeight;
        }
        
        private function initButton():void
        {
            if (options.buttonImage) {
                buttonLoader.load(new URLRequest(options.buttonImage));
            }
            else {
                buttonLoader.unload();
            }
            
            updateSize();
            
            updateButton();
        }
        
        private function updateButton():void
        {
            var to_y:int = 0;
            var event:String = 'Leave';
            
            if (buttonState & BUTTON_STATE_DISABLED) {
                to_y = stage.stageHeight * -3;
                event = 'Disable';
            }
            else if (buttonState & BUTTON_STATE_DOWN) {
                to_y = stage.stageHeight * -2;
                event = 'Down';
            }
            else if (buttonState & BUTTON_STATE_OVER) {
                to_y = stage.stageHeight * -1;
                event = 'Enter';
            }
            
            if (to_y != buttonLoader.y) {
                buttonLoader.y = to_y;
                fireEvent('button' + event);
            }
        }
        
        private function browse():void
        {
            var filter:Array = new Array();
            
            if (options.typeFilter is String) {
                var description:String = options.typeFilterDescription || options.typeFilter;
                var type:FileFilter = new FileFilter(description, options.typeFilter 
                    + '; ' + options.typeFilter.toUpperCase() + '; ' 
                    + options.typeFilter.toLowerCase());
                filter.push(type);
            }
            else if (options.typeFilter is Object) {
                for (var key:String in options.typeFilter) {
                    filter.push(new FileFilter(key, options.typeFilter[key] + '; ' 
                        + options.typeFilter[key].toUpperCase() + '; ' 
                        + options.typeFilter[key].toLowerCase()));
                }
            }
            
            fireEvent('browse');
            
            dialog = (options.multiple) ? new FileReferenceList() : new FileReference();
            dialog.addEventListener(Event.SELECT, handleSelect);
            dialog.addEventListener(Event.CANCEL, handleCancel);
            
            try {
                dialog.browse((filter.length) ? filter : null);
            }
            catch (e:Error) {
                verboseLog('Main::browse Exception', e.toString());
            }
        }
        
        private function handleSelect(event:Event):void
        {
            verboseLog('Main::handleSelect Adding Files');
            
            var origin:FileReference,
                ref:File,
                added:Array = new Array();
            
            if (options.multiple) {
                var refList:FileReferenceList = dialog;
                for (var i:uint = 0; i < refList.fileList.length; i++) {
                    origin = refList.fileList[i];
                    ref = new File(this, origin);
                    added.push(ref);
                }
            }
            else {
                origin = dialog;
                ref = new File(this, origin);
                added.push(ref);
            }
            
            var failed:Array = new Array();
            added = added.filter(function(ref:File, i:uint, self:Array):Boolean {
                if (!ref.validate()) {
                    ref.id = 0; // invalidate file reference
                    failed.push(ref);
                    return false;
                }
                size += ref.reference.size;
                return true;
            });
            
            fileList = fileList.concat(added);
            
            if (added.length)
                fireEvent('selectSuccess', [File.exportMany(added)]);
            if (failed.length)
                fireEvent('selectFail', [File.exportMany(failed)]);
            fireEvent('queue', [queueUpdate()]);
            
            dialog = null;
        }
        
        private function handleCancel(event:Event):void
        {
            buttonState = buttonState & ~ BUTTON_STATE_OVER;
            updateButton();
            
            fireEvent('cancel');
            
            dialog = null;
        }
        
        private function getFileById(id:uint):File
        {
            if (id > 0) {
                for (var i:uint = 0; i < fileList.length; i++) {
                    if (fileList[i].id == id)
                        return fileList[i];
                }
            }
            
            verboseLog('Main::getFileById', 'File not found: ' + id);
            
            return null;
        }
        
        public function hasFile(check:File):Boolean
        {
            verboseLog('Main::hasFile', 'Checking ' + check.reference.name);
            
            return fileList.some(function(current:File, i:uint, self:Array):Boolean {
                if (current.reference == check.reference) return true;
                return (check.reference.name == current.reference.name 
                    && check.reference.size == current.reference.size 
                    && check.reference.creationDate.valueOf() == current.reference.creationDate.valueOf());
            }, this);
        }
        
        // Misc. helpers
        
        public function verboseLog(labelName:String, message:* = null):void
        {
            if (!options.verbose) return;
            labelName = '[FLASH-VERBOSE] ' + labelName;
            if (message)
                ExternalInterface.call('apf.console.info', labelName + ':', Escaper.escape(message));
            else
                ExternalInterface.call('apf.console.info', labelName);
        }
        
    }
}