instapage_cms_plugin-8.x-3.34/core/assets/js/download.js

//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;
  };
}));