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Diffstat (limited to 'resources/download.js')
| -rwxr-xr-x | resources/download.js | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/resources/download.js b/resources/download.js new file mode 100755 index 0000000..934edcc --- /dev/null +++ b/resources/download.js @@ -0,0 +1,162 @@ +//download.js v4.2, by dandavis; 2008-2016. [CCBY2] see http://danml.com/download.html for tests/usage +// v1 landed a FF+Chrome compat way of downloading strings to local un-named files, upgraded to use a hidden frame and optional mime +// v2 added named files via a[download], msSaveBlob, IE (10+) support, and window.URL support for larger+faster saves than dataURLs +// v3 added dataURL and Blob Input, bind-toggle arity, and legacy dataURL fallback was improved with force-download mime and base64 support. 3.1 improved safari handling. +// v4 adds AMD/UMD, commonJS, and plain browser support +// v4.1 adds url download capability via solo URL argument (same domain/CORS only) +// v4.2 adds semantic variable names, long (over 2MB) dataURL support, and hidden by default temp anchors +// https://github.com/rndme/download + +(function (root, factory) { + if (typeof define === 'function' && define.amd) { + // AMD. Register as an anonymous module. + define([], factory); + } else if (typeof exports === 'object') { + // Node. Does not work with strict CommonJS, but + // only CommonJS-like environments that support module.exports, + // like Node. + module.exports = factory(); + } else { + // Browser globals (root is window) + root.download = factory(); + } +}(this, function () { + + return function download(data, strFileName, strMimeType) { + + var self = window, // this script is only for browsers anyway... + defaultMime = "application/octet-stream", // this default mime also triggers iframe downloads + 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"){ //reverse arguments, allowing download.bind(true, "text/xml", "export.xml") to act as a callback + payload=[payload, mimeType]; + mimeType=payload[0]; + payload=payload[1]; + } + + + if(url && url.length< 2048){ // if no filename and no mime, assume a url was passed as the only argument + fileName = url.split("/").pop().split("?")[0]; + anchor.href = url; // assign href prop to temp anchor + if(anchor.href.indexOf(url) !== -1){ // if the browser determines that it's a potentially valid url path: + 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); // allows setting custom ajax headers using the return: + return ajax; + } // end if valid url? + } // end if url? + + + //go ahead and download dataURLs right away + 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 ? // IE10 can't do a[download], only Blobs: + navigator.msSaveBlob(dataUrlToBlob(payload), fileName) : + saver(payload) ; // everyone else can save dataURLs un-processed + } + + }//end if dataURL passed? + + blob = payload instanceof myBlob ? + payload : + new myBlob([payload], {type: mimeType}) ; + + + function dataUrlToBlob(strUrl) { + var parts= strUrl.split(/[:;,]/), + type= parts[1], + decoder= parts[2] == "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) { //html5 A[download] + anchor.href = url; + anchor.setAttribute("download", fileName); + anchor.className = "download-js-link"; + anchor.innerHTML = "downloading..."; + anchor.style.display = "none"; + 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; + } + + // handle non-a[download] safari as best we can: + if(/(Version)\/(\d+)\.(\d+)(?:\.(\d+))?.*Safari\//.test(navigator.userAgent)) { + url=url.replace(/^data:([\w\/\-\+]+)/, defaultMime); + if(!window.open(url)){ // popup blocked, offer direct download: + if(confirm("Displaying New Document\n\nUse Save As... to download, then click back to return to this page.")){ location.href=url; } + } + return true; + } + + //do iframe dataURL download (old ch+FF): + var f = document.createElement("iframe"); + document.body.appendChild(f); + + if(!winMode){ // force a mime that will download: + url="data:"+url.replace(/^data:([\w\/\-\+]+)/, defaultMime); + } + f.src=url; + setTimeout(function(){ document.body.removeChild(f); }, 333); + + }//end saver + + + + + if (navigator.msSaveBlob) { // IE10+ : (has Blob, but not a[download] or URL) + return navigator.msSaveBlob(blob, fileName); + } + + if(self.URL){ // simple fast and modern way using Blob and URL: + saver(self.URL.createObjectURL(blob), true); + }else{ + // handle non-Blob()+non-URL browsers: + if(typeof blob === "string" || blob.constructor===toString ){ + try{ + return saver( "data:" + mimeType + ";base64," + self.btoa(blob) ); + }catch(y){ + return saver( "data:" + mimeType + "," + encodeURIComponent(blob) ); + } + } + + // Blob but not URL support: + reader=new FileReader(); + reader.onload=function(e){ + saver(this.result); + }; + reader.readAsDataURL(blob); + } + return true; + }; /* end download() */ +}));
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