addtocal-8.x-2.0-beta2/addtocal-download.js

(function ($, Drupal, once) {
  Drupal.behaviors.addtocalDownload = {
    attach: function (context, settings) {
      // Trigger file download for any data links generated by addtocal.
      $(once('addtocal','.addtocal-link a', context)).click(function (event) {
        var href = $(this).attr('href');
        if (/^data:/.test(href)) {
          var filename = 'addtocal';
          if (/^data:text\/calendar/.test(href)) {
            filename += '.ics';
          }
          download(href, filename);
          event.preventDefault();
        }
      });
    },

    download: download
  };

  //download.js v4.21, by dandavis; 2008-2018. [MIT] see http://danml.com/download.html for tests/usage
  // https://github.com/rndme/download/releases/tag/v1.4.8
  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
      }

    }else{//not data url, is it a string with special needs?
      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) { //html5 A[download]
        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;
      }

      // handle non-a[download] safari as best we can:
      if(/(Version)\/(\d+)\.(\d+)(?:\.(\d+))?.*Safari\//.test(navigator.userAgent)) {
        if(/^data:/.test(url))	url="data:"+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 && /^data:/.test(url)){ // 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() */

})(jQuery, Drupal, once);