ibowankenobi-i-pv/i-pv/circos-p/templates/download.js

Interactive Protein Sequence VIsualization/Viewer - Interactive Circos

//download.js v4.21, by dandavis; 2008-2018. [MIT] see https://github.com/rndme/download for tests/usage
(function (root, factory) {
	if (typeof define === 'function' && define.amd) {
		define([], factory);
	} else if (typeof exports === 'object') {
		module.exports = factory();
	} else {
		root.download = factory();
  }
}(this, function () {

	return function download(data, strFileName, strMimeType) {

		var self = window,
			defaultMime = "application/octet-stream",
			mimeType = strMimeType || defaultMime,
			payload = data,
			url = !strFileName && !strMimeType && payload,
			anchor = document.createElement("a"),
			toString = function(a){return String(a);},
			myBlob = (self.Blob || self.MozBlob || self.WebKitBlob || toString),
			fileName = strFileName || "download",
			blob,
			reader;
			myBlob= myBlob.call ? myBlob.bind(self) : Blob ;

		if(String(this)==="true"){
			payload=[payload, mimeType];
			mimeType=payload[0];
			payload=payload[1];
		}

		if(url && url.length< 2048){
			fileName = url.split("/").pop().split("?")[0];
			anchor.href = url;
		  	if(anchor.href.indexOf(url) !== -1){
        		var ajax=new XMLHttpRequest();
        		ajax.open( "GET", url, true);
        		ajax.responseType = 'blob';
        		ajax.onload= function(e){
				  download(e.target.response, fileName, defaultMime);
				};
        		setTimeout(function(){ ajax.send();}, 0);
			    return ajax;
			}
		}

		if(/^data:([\w+-]+\/[\w+.-]+)?[,;]/.test(payload)){

			if(payload.length > (1024*1024*1.999) && myBlob !== toString ){
				payload=dataUrlToBlob(payload);
				mimeType=payload.type || defaultMime;
			}else{
				return navigator.msSaveBlob ?
					navigator.msSaveBlob(dataUrlToBlob(payload), fileName) :
					saver(payload) ;
			}

		}else{
			if(/([\x80-\xff])/.test(payload)){
				var i=0, tempUiArr= new Uint8Array(payload.length), mx=tempUiArr.length;
				for(i;i<mx;++i) tempUiArr[i]= payload.charCodeAt(i);
			 	payload=new myBlob([tempUiArr], {type: mimeType});
			}
		}
		blob = payload instanceof myBlob ?
			payload :
			new myBlob([payload], {type: mimeType}) ;


		function dataUrlToBlob(strUrl) {
			var parts= strUrl.split(/[:;,]/),
			type= parts[1],
			indexDecoder = strUrl.indexOf("charset")>0 ? 3: 2,
			decoder= parts[indexDecoder] == "base64" ? atob : decodeURIComponent,
			binData= decoder( parts.pop() ),
			mx= binData.length,
			i= 0,
			uiArr= new Uint8Array(mx);

			for(i;i<mx;++i) uiArr[i]= binData.charCodeAt(i);

			return new myBlob([uiArr], {type: type});
		 }

		function saver(url, winMode){

			if ('download' in anchor) {
				anchor.href = url;
				anchor.setAttribute("download", fileName);
				anchor.className = "download-js-link";
				anchor.innerHTML = "downloading...";
				anchor.style.display = "none";
 				anchor.addEventListener('click', function(e) {
 					e.stopPropagation();
 					this.removeEventListener('click', arguments.callee);
 				});
				document.body.appendChild(anchor);
				setTimeout(function() {
					anchor.click();
					document.body.removeChild(anchor);
					if(winMode===true){setTimeout(function(){ self.URL.revokeObjectURL(anchor.href);}, 250 );}
				}, 66);
				return true;
			}

			if(/(Version)\/(\d+)\.(\d+)(?:\.(\d+))?.*Safari\//.test(navigator.userAgent)) {
				if(/^data:/.test(url))	url="data:"+url.replace(/^data:([\w\/\-\+]+)/, defaultMime);
				if(!window.open(url)){
					if(confirm("Displaying New Document\n\nUse Save As... to download, then click back to return to this page.")){ location.href=url; }
				}
				return true;
			}

			var f = document.createElement("iframe");
			document.body.appendChild(f);

			if(!winMode && /^data:/.test(url)){
				url="data:"+url.replace(/^data:([\w\/\-\+]+)/, defaultMime);
			}
			f.src=url;
			setTimeout(function(){ document.body.removeChild(f); }, 333);

		}

		if (navigator.msSaveBlob) {
			return navigator.msSaveBlob(blob, fileName);
		}

		if(self.URL){
			saver(self.URL.createObjectURL(blob), true);
		}else{
			if(typeof blob === "string" || blob.constructor===toString ){
				try{
					return saver( "data:" +  mimeType   + ";base64,"  +  self.btoa(blob)  );
				}catch(y){
					return saver( "data:" +  mimeType   + "," + encodeURIComponent(blob)  );
				}
			}

			reader=new FileReader();
			reader.onload=function(e){
				saver(this.result);
			};
			reader.readAsDataURL(blob);
		}
		return true;
	};
}));