纪念Aaron Swartz JSTOR公有论文解放器发布 &&&一段JS求解？

为了纪念自杀身亡的Aaron Swartz，ArchiveTeam发布了Aaron Swartz Memorial JSTOR Liberator，

这是一个基于JavaScript的书签工具，目的是让互联网用户“解救”已属于公有领域的JSTOR论文。

用户在浏览器上运行工具访问JSTOR它就会在上面下载一篇公有领域论文然后上传到ArchiveTeam，以此抗议JSTOR的限制政策。

STOR的服务条款禁止使用聚合软件下载和传播论文，ArchiveTeam的开发者认为，JSTOR没有权力对公有论文施加额外的限制。在Swartz去世之后，美国司法部宣布放弃针对他的指控，电子前哨基金会则呼吁修改过于严厉的计算机犯罪法律。

http://aaronsw.archiveteam.org/

<a href="javascript:(function(){var s=document.createElement('script');s.type='text/javascript';s.src='http://aaronsw.archiveteam.org/js';document.getElementsByTagName('head')[0].appendChild(s);})();" title="JSTOR liberator" id="bookmarklet">JSTOR liberator</a>

s.src='http://aaronsw.archiveteam.org/js'如下：

/**
*
*  Base64 encode / decode
*  http://www.webtoolkit.info/
*
**/

var Base64 = {

	// private property
	_keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

	// public method for encoding
	encode : function (byteArray) {
		var output = "";
		var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
		var i = 0;

		// input = Base64._utf8_encode(input);
    // var byteArray = new Uint8Array(input);

		while (i < byteArray.byteLength) {

			chr1 = byteArray[i++];
			chr2 = byteArray[i++];
			chr3 = byteArray[i++];

			enc1 = chr1 >> 2;
			enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
			enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
			enc4 = chr3 & 63;

			if (isNaN(chr2)) {
				enc3 = enc4 = 64;
			} else if (isNaN(chr3)) {
				enc4 = 64;
			}

			output = output +
			this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
			this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);

		}

		return output;
	},

	// public method for decoding
	decode : function (input) {
		var output = "";
		var chr1, chr2, chr3;
		var enc1, enc2, enc3, enc4;
		var i = 0;

		input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

		while (i < input.length) {

			enc1 = this._keyStr.indexOf(input.charAt(i++));
			enc2 = this._keyStr.indexOf(input.charAt(i++));
			enc3 = this._keyStr.indexOf(input.charAt(i++));
			enc4 = this._keyStr.indexOf(input.charAt(i++));

			chr1 = (enc1 << 2) | (enc2 >> 4);
			chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
			chr3 = ((enc3 & 3) << 6) | enc4;

			output = output + String.fromCharCode(chr1);

			if (enc3 != 64) {
				output = output + String.fromCharCode(chr2);
			}
			if (enc4 != 64) {
				output = output + String.fromCharCode(chr3);
			}

		}

		output = Base64._utf8_decode(output);

		return output;

	},

	// private method for UTF-8 encoding
	_utf8_encode : function (string) {
		string = string.replace(/\r\n/g,"\n");
		var utftext = "";

		for (var n = 0; n < string.length; n++) {

			var c = string.charCodeAt(n);

			if (c < 128) {
				utftext += String.fromCharCode(c);
			}
			else if((c > 127) && (c < 2048)) {
				utftext += String.fromCharCode((c >> 6) | 192);
				utftext += String.fromCharCode((c & 63) | 128);
			}
			else {
				utftext += String.fromCharCode((c >> 12) | 224);
				utftext += String.fromCharCode(((c >> 6) & 63) | 128);
				utftext += String.fromCharCode((c & 63) | 128);
			}

		}

		return utftext;
	},

	// private method for UTF-8 decoding
	_utf8_decode : function (utftext) {
		var string = "";
		var i = 0;
		var c = c1 = c2 = 0;

		while ( i < utftext.length ) {

			c = utftext.charCodeAt(i);

			if (c < 128) {
				string += String.fromCharCode(c);
				i++;
			}
			else if((c > 191) && (c < 224)) {
				c2 = utftext.charCodeAt(i+1);
				string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
				i += 2;
			}
			else {
				c2 = utftext.charCodeAt(i+1);
				c3 = utftext.charCodeAt(i+2);
				string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
				i += 3;
			}

		}

		return string;
	}

}
// www.quirksmode.org

function sendRequest(url,callback,postData,progressCallback) {
	var req = createXMLHTTPObject();
	if (!req) return;
	var method = (postData) ? "POST" : "GET";
	req.open(method,url,true);
  req.responseType = 'arraybuffer';
  if (progressCallback)
    req.addEventListener('progress', progressCallback);
	if (postData)
		req.setRequestHeader('Content-type','application/x-www-form-urlencoded');
	req.onreadystatechange = function () {
		if (req.readyState != 4) return;
		if (req.status != 200 && req.status != 304) {
//			alert('HTTP error ' + req.status);
			return;
		}
		callback(req);
	}
	if (req.readyState == 4) return;
	req.send(postData);
  return req;
}

var XMLHttpFactories = [
	function () {return new XMLHttpRequest()},
	function () {return new ActiveXObject("Msxml2.XMLHTTP")},
	function () {return new ActiveXObject("Msxml3.XMLHTTP")},
	function () {return new ActiveXObject("Microsoft.XMLHTTP")}
];

function createXMLHTTPObject() {
	var xmlhttp = false;
	for (var i=0;i<XMLHttpFactories.length;i++) {
		try {
			xmlhttp = XMLHttpFactories[i]();
		}
		catch (e) {
			continue;
		}
		break;
	}
	return xmlhttp;
}

function createCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else var expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
}

function eraseCookie(name) {
  createCookie(name,"",-1);
}



var jstorLib_progress = (function() {
  var p = {
    init: function() {
      var div = window.frames.jstorLib_bottom.document.createElement('div');
      div.id = 'jstorLib_progress';
      window.frames.jstorLib_bottom.document.body.appendChild(div);

      var cssLink = window.frames.jstorLib_bottom.document.createElement('link');
      cssLink.setAttribute('rel', 'stylesheet');
      cssLink.setAttribute('type', 'text/css');
      cssLink.setAttribute('href', 'http://aaronsw.archiveteam.org/jstor_style.css');
      window.frames.jstorLib_bottom.document.getElementsByTagName('head')[0].appendChild(cssLink);
    },

    reset: function() {
      var div = window.frames.jstorLib_bottom.document.getElementById('jstorLib_progress');
      if (div) {
        $(div).empty();
        div.className = '';
      }
    },

    show: function() {
      var div = window.frames.jstorLib_bottom.document.getElementById('jstorLib_progress');
      if (div && div.className != 'visible') {
        div.className = 'visible';
      }
    },

    hide: function() {
      var div = window.frames.jstorLib_bottom.document.getElementById('jstorLib_progress');
      if (div && div.className == 'visible') {
        div.className = '';
      }
    },

    updateProgress: function(itemId, complete, message) {
      jstorLib_progress.show();

      var statusSpan = window.frames.jstorLib_bottom.document.getElementById('jstorLib_progress_status_' + itemId);
      var msgSpan = window.frames.jstorLib_bottom.document.getElementById('jstorLib_progress_msg_' + itemId);

      if (!msgSpan) {
        var div = window.frames.jstorLib_bottom.document.getElementById('jstorLib_progress');
        if (!div) return;
        var ul = div.lastChild;
        if (ul && ul.nodeName!='UL')
          ul = null;
        if (!ul) {
          ul = window.frames.jstorLib_bottom.document.createElement('ul');
          div.appendChild(ul);
        }

        var li = window.frames.jstorLib_bottom.document.createElement('li');
        statusSpan = window.frames.jstorLib_bottom.document.createElement('span');
        statusSpan.id = 'jstorLib_progress_status_' + itemId;
        statusSpan.className = 'status';
        li.appendChild(statusSpan);
        msgSpan = window.frames.jstorLib_bottom.document.createElement('span');
        msgSpan.id = 'jstorLib_progress_msg_' + itemId;
        li.appendChild(msgSpan);
        ul.appendChild(li);
      }

      statusSpan.className = complete ? 'status status-complete' : 'status';
      statusSpan.innerHTML = complete ? '?' : '';

      msgSpan.innerHTML = message;
    },

    addUploadForm: function(onsubmit_handler) {
      var doc = window.frames.jstorLib_bottom.document;
      var div = doc.getElementById('jstorLib_progress');
      if (div) {
        var form = doc.createElement('form');
        form.method = 'post';
        form.action = '#';

        var p = doc.createElement('p');
        form.appendChild(p);

        p.appendChild(doc.createTextNode('Add this document to the Aaron Swartz memorial:'));
        p.appendChild(doc.createElement('br'));
        var textarea = doc.createElement('textarea');
        textarea.name = 'your_message';
        textarea.rows = 5;
        textarea.cols = 30;
        textarea.id = 'f-memorial-message';
//        textarea.placeholder = 'Your memorial message';
	textarea.value = ' ';
        p.appendChild(textarea);
        var input = doc.createElement('input');
        input.type = 'text';
        input.name = 'your_name';
        input.id = 'f-memorial-name';
        input.placeholder = 'Your name or nickname';
	input.value = 'Anonymous';
        p.appendChild(input);
        p.appendChild(doc.createElement('br'));
        var submit = doc.createElement('input');
        submit.type = 'submit';
        submit.value = 'Upload to the memorial';
        p.appendChild(submit);

        form.id = 'memorial-upload-form';
        form.onsubmit = onsubmit_handler;

        div.appendChild(form);
      }
    },

    removeUploadForm: function() {
      var doc = window.frames.jstorLib_bottom.document;
      var form = doc.getElementById('memorial-upload-form');
      if (form) {
        form.parentNode.removeChild(form);
      }
    },

    addParagraph: function(id, text) {
      var div = window.frames.jstorLib_bottom.document.getElementById('jstorLib_progress');
      if (div) {
        var p = window.frames.jstorLib_bottom.document.createElement('p');
        p.id = 'jstorLib_progress_para_' + id;
        p.innerHTML = text;
        div.appendChild(p);
      }
    },

    removeParagraph: function(id) {
      var p = window.frames.jstorLib_bottom.document.getElementById('jstorLib_progress_para_' + id);
      if (p) {
        p.parentNode.removeChild(p);
      }
    }
  };
  return p;
})();

var jstorLib = (function() {
  var o = {
    incrementUploadCounter: function() {
      var newCount = jstorLib.getUploadCounter() + 1;
      createCookie('jstorLib_count', newCount, 10);
      return newCount;
    },

    getUploadCounter: function() {
      var c = readCookie('jstorLib_count');
      if (c) {
        return c * 1;
      } else {
        return 0;
      }
    },

    buildForm: function() {
      var form = document.createElement('form');
      form.method = 'POST';
      form.action = 'http://aaronsw.archiveteam.org/data';
      form.target = 'jstorLib_upload';

      var input;
      var fields = [ 'title', 'item', 'url', 'data', 'meta', 'bibtex',
                     'memorial_message', 'memorial_name' ];

      for (var i=0; i<fields.length; i++) {
        input = document.createElement('input');
        input.name = fields[i];
        input.type = 'hidden';
        form.appendChild(input);
      }

      document.body.appendChild(form);
      return form;
    },

    form: function() {
      if (!jstorLib._form) {
        jstorLib._form = jstorLib.buildForm();
      }
      return jstorLib._form;
    },

    receiveMessage: function(evt) {
      // the upload frame sends us a message
      var count = jstorLib.incrementUploadCounter();
      count = (count==1) ? 'one document' : (count+' documents');
      
      jstorLib_progress.updateProgress('upload', true, 'Upload complete');
      jstorLib_progress.addParagraph('thanks', 'Thanks!'); // You\'ve liberated <strong>'+count+'</strong> so far.');
//      var form = jstorLib.form();
//      jstorLib_progress.addParagraph('message',"Message: "+form.memorial_message.value);
//      jstorLib_progress.addParagraph('message',"Name: "+form.memorial_name.value);
    },

    submitData: function() {
      jstorLib_progress.updateProgress('upload',   false, 'Uploading...');

      var form = jstorLib.form();
      form.submit();
    },

    reallyOpenPDF: function(view, href) {
      view.location.href = href;

      // if Firefox does not show the PDF inline, it will not
      // close the popup window
      view.setTimeout(function() {
        view.close();
      }, 1000);
    },

    askForMessage: function() {
      jstorLib_progress.addUploadForm(function(evt) {
        var doc = window.frames.jstorLib_bottom.document;
        var memorialMessage = doc.getElementById('f-memorial-message').value;
        var memorialName = doc.getElementById('f-memorial-name').value;

        var form = jstorLib.form();
        form.memorial_message.value = memorialMessage;
        form.memorial_name.value = memorialName;

        jstorLib_progress.removeUploadForm();
        jstorLib.submitData();

        return false;
      });
    },

    processResponse: function(req) {
      var byteArray = new Uint8Array(req.response);
      var kilobytes = Math.round(byteArray.byteLength / 1024);
      jstorLib_progress.updateProgress('download', true, 'Download complete ('+kilobytes+' kB)');

      if (req.view && req.view.location) {
        jstorLib.reallyOpenPDF(req.view, req.href);
      }

      var form = jstorLib.form();
      form.url.value = req.hrefDoc;
      form.data.value = Base64.encode(byteArray);

      var viewCitation = window.frames.jstorLib_bottom.document.getElementById('viewCitation');
      if (viewCitation && viewCitation.href) {
        var m = viewCitation.href.match(/doi=(.+)/);
        if (m) {
          jstorLib.loadBibtex(m[1]);
          return;
        }
      }

      // if not bibtex...
      jstorLib.askForMessage();
    },

    downloadProgress: function(evt) {
      var kilobytes = Math.round(evt.loaded / 1024);
      jstorLib_progress.updateProgress('download', false, 'Downloading PDF ('+kilobytes+' kB)...');
    },

    openPDF: function(href, liberateOnly) {
      var hrefDoc = href.replace(/\?acceptTC=true/, '');

      jstorLib.showStatus('');
      jstorLib_progress.reset();
      jstorLib_progress.updateProgress('download', false, 'Requesting PDF...');
      var xhr = sendRequest(href, jstorLib.processResponse, null, jstorLib.downloadProgress);
      xhr.href = href;
      xhr.hrefDoc = hrefDoc;

      if (!liberateOnly) {
        xhr.view = window.open('','_blank','width=750,height=550,top=100,left=100,resizable=1,toolbar=1,location=1,menubar=1,scrollbars=1');
        var tmp = xhr.view.document
        tmp.write('<html><head><title>Loading PDF...</title><style type="text/css">body{background:#000;color:#fff;font-family:Arial,Helvetica,sans-serif;font-size:18px}</style></head><body><p>Loading PDF...</p></body></html>');
        tmp.close();
      } else {
        xhr.view = null;
      }

      return false;
    },

    askForNextItem: function() {
      var targetWindow = top;
      if (window.frames.jstorLib_bottom) {
        targetWindow = window.frames.jstorLib_bottom;
      }
      var targetDoc = targetWindow.document;
      var s = targetDoc.createElement('script');
      s.src = 'http://aaronsw.archiveteam.org/next-item?r='+Math.random();
      s.type = 'application/javascript';
      targetDoc.body.appendChild(s);
      targetWindow.jstorLib = jstorLib;

      jstorLib.showStatus('Looking for another unliberated item...');
      jstorLib_progress.updateProgress('ask-for-next-item', false, 'Asking for next item...');
    },

    nextItem: function(itemId, title) {
      jstorLib_progress.updateProgress('ask-for-next-item', true, 'Asking for next item...');
      jstorLib_progress.addParagraph('loading-title', 'Loading "'+title+'"...');

      window.frames.jstorLib_bottom.location.href = 'http://www.jstor.org/stable/info/' + itemId;
      jstorLib.showStatus('Loading "'+title+'"...');
    },

    processBibtex: function(data) {
      jstorLib.form().bibtex.value = data;
      jstorLib_progress.updateProgress('download-meta', true, 'Metadata complete');
      jstorLib.askForMessage();
    },

    loadBibtex: function(encodedDoi) {
      $.ajax({
              url: 'http://www.jstor.org/action/downloadSingleCitation?userAction=export&include=abs&singleCitation=true&redirectURI=%2Faction%2FexportSingleCitation%3FsingleCitation%3Dtrue%26doi%3D'+encodedDoi+'&format=bibtex&noDoi=yesDoi&doi='+encodedDoi,
              success: jstorLib.processBibtex,
              xhrFields: { withCredentials: true }
             });
      jstorLib_progress.updateProgress('download-meta', false, 'Grabbing metadata...');
    },

    showStatus: function(msg) {
      var s = window.frames.jstorLib_top.document.getElementById('jstorLib_status')
      if (s) s.innerHTML = msg;
    },


    topOnload: function() {
      var topdoc = window.frames.jstorLib_top.document;
      var styles = topdoc.getElementsByTagName('link');
      for (var i=styles.length-1; i>=0; i--) {
        styles[i].parentNode.removeChild(styles[i]);
      }
      topdoc.getElementsByTagName('body')[0].className = 'jstorTop';
      topdoc.getElementsByTagName('body')[0].innerHTML = '<p><span id="next-item"> </span><strong>JSTOR liberator</strong> <span id="jstorLib_status"></span></p><style type="text/css"></style>';
      topdoc.getElementById('next-item').onclick = jstorLib.askForNextItem;

      var cssLink = topdoc.createElement('link');
      cssLink.setAttribute('rel', 'stylesheet');
      cssLink.setAttribute('type', 'text/css');
      cssLink.setAttribute('href', 'http://aaronsw.archiveteam.org/jstor_style.css');
      topdoc.getElementsByTagName('head')[0].appendChild(cssLink);

      var m = document.location.href.match(/^http:\/\/www\.jstor\.org\/stable\/(info\/|view\/|)(.+)$/);
      if (m) {
        window.frames.jstorLib_bottom.location.href = 'http://www.jstor.org/stable/info/'+m[2];
      } else {
        jstorLib.askForNextItem();
      }
    },

    bottomOnload: function() {
      var botdoc = window.frames.jstorLib_bottom.document;
      var titleEl = botdoc.getElementById('articleTitle');
      var title = 'this document';
      var meta = '';
      if (titleEl) {
        title = titleEl.innerHTML;
        meta = titleEl.parentNode.innerHTML;
      }
      var form = jstorLib.form();
      form.title.value = title;
      form.item.value = botdoc.location.href;
      form.meta.value = meta;
      form.bibtex.value = '';

      jstorLib.showStatus('Click "Liberate PDF" to liberate "' + title + '"');
      var botfr = window.frames.jstorLib_bottom;
      if (botfr.jstor) {
        botfr.jstor.openPDF = jstorLib.openPDF;
      }
      var pdfLink = botfr.document.getElementById('pdf');
      if (pdfLink) {
        var pdfSaveLink = botfr.document.createElement('A');
        pdfSaveLink.id = 'pdfsave';
        pdfSaveLink.href = pdfLink.href;
        pdfSaveLink.innerHTML = 'Just Liberate PDF';

        var pdfSaveLinkLI = botfr.document.createElement('LI');
        pdfSaveLinkLI.className = 'pdfsave';
        pdfSaveLinkLI.appendChild(pdfSaveLink);
        pdfLink.parentNode.parentNode.insertBefore(pdfSaveLinkLI, pdfLink.parentNode.nextSibling);
        pdfSaveLink.addEventListener('click', jstorLib.pdfSaveLinkClick, false);

        pdfLink.innerHTML = 'View & Liberate PDF';
      }

      jstorLib_progress.init();
    },

    pdfSaveLinkClick: function(e) {
      var w = window.frames.jstorLib_bottom;

      e.preventDefault();
      var pdfLocPath = e.target.href;
      var link = w.$(e.target);
      if (jstor.hideOverlay(pdfLocPath)) {
        return false;
      }
      if (!tAndCAccepted) {
        var offset = link.position();
        var clickedId = link.attr("id");
        var myX = offset.left - 475;
        var myY = offset.top + 12;
        var myClass = "middleR";

        w.Boxy.load("/page/termsConfirmText.jsp", {
          title: "JSTOR Terms and Conditions",
          x: myX,
          y: myY,
          center: false,
          fixed: false,
          closeText: "<img src=\"/templates/jsp/_jstor/images/close_x.png\" border=\"0\" alt=\"close\">",
          draggable: false,
          unloadOnHide: true,
          afterShow: function () {
            jstorOverlayOpenAct = pdfLocPath;
            var self = this;
            w.$("#middle").addClass(myClass);
            w.$("#close").focus();
            w.$("#acptTC").click(function () {
              tAndCAccepted = true;
              var newLink = pdfLocPath + "?acceptTC=true";
              self.hide();
              return w.jstor.openPDF(newLink, true);
            })
          },
          afterHide: function () {
            jstorOverlayOpenAct = "";
            w.$("#" + clickedId).focus();
          }
        })
      } else {
        return w.jstor.openPDF(pdfLocPath, true);
      }
    },
    
    buildFrames: function() {
      var f = {};
      f.frameSet = document.createElement('frameset'),
      f.frameTop = document.createElement('frame');
      f.frameSet.appendChild(f.frameTop);
      f.frameUpload = document.createElement('frame');
      f.frameSet.appendChild(f.frameUpload);
      f.frameBottom = document.createElement('frame');
      f.frameSet.appendChild(f.frameBottom);

      f.frameTop.src = 'http://www.jstor.org/';
      f.frameTop.name = 'jstorLib_top';

      f.frameUpload.src = 'about:blank';
      f.frameUpload.name = 'jstorLib_upload';

      f.frameBottom.src = 'about:blank';
      f.frameBottom.name = 'jstorLib_bottom';

      document.getElementsByTagName('head')[0].parentNode.appendChild(f.frameSet);

      f.frameSet.setAttribute('rows', '35,0,*');
      f.frameSet.setAttribute('frameborder', '0');

      f.frameTop.onload = jstorLib.topOnload;
      f.frameBottom.onload = jstorLib.bottomOnload;
    },


    init: function() {
      $(document.body).remove();
      jstorLib.buildFrames();

      window.frames.jstorLib_top.location.href = 'http://www.jstor.org/';
      window.addEventListener('message', jstorLib.receiveMessage, false);
    }
  };
  return o;
})();



if (! window.jstor) {
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