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GoogleBookDown - Download Google Books as PNGs or PDF

Saves all available Preview pages from a Google Book as PNGs or PDF, Base on GBookDown

  1. // ==UserScript==
  2. // @name         GoogleBookDown - Download Google Books as PNGs or PDF
  3. // @description  Saves all available Preview pages from a Google Book as PNGs or PDF, Base on GBookDown
  4. // @author       kawais
  5. // @namespace    kawais
  6. // @include      https://books.google.*/books*
  7. // @version      1.0
  8. // @require      https://cdnjs.cloudflare.com/ajax/libs/jquery/1.12.0/jquery.min.js
  9. // @require      https://cdnjs.cloudflare.com/ajax/libs/jszip/2.5.0/jszip.min.js
  10. // @require      https://cdnjs.cloudflare.com/ajax/libs/FileSaver.js/1.3.8/FileSaver.min.js
  11. // @require			 https://cdnjs.cloudflare.com/ajax/libs/jspdf/1.5.3/jspdf.min.js
  12. // @grant        GM.xmlhttpRequest
  13. // ==/UserScript==
  14.  
  15. this.$ = this.jQuery = jQuery.noConflict(true);
  16. console.log(GM_info);
  17.  
  18. (function () {
  19.   var css = [
  20.     '#savePNG {',
  21.     '    position: fixed;',
  22.     '    padding: 7px;',
  23.     '    background-color: #F8EEB1;',
  24.     '    border: 2px solid #333;',
  25.     '    border-radius: 6px;',
  26.     '    z-index: 9999;',
  27.     '    font-size: 18px;',
  28.     '    right: 30px;',
  29.     '    bottom: 20px;',
  30.     '    color: #000;',
  31.     '    width: 650px;',
  32.     '    text-align: center;',
  33.     '    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.5), 0 0 15px rgba(0, 0, 0, 0.3);',
  34.     '}',
  35.     '#savePNG button {',
  36.     '    font-size: 18px;',
  37.     '    width: 100px;',
  38.     '    cursor: pointer;',
  39.     '}',
  40.     '#savePNG input {',
  41.     '    width: 60px;',
  42.     '    font-size: 18px;',
  43.     '    text-align: center;',
  44.     '}'
  45.   ].join('\n');
  46.   if (typeof GM_addStyle != 'undefined') {
  47.     GM_addStyle(css);
  48.   } else if (typeof PRO_addStyle != 'undefined') {
  49.     PRO_addStyle(css);
  50.   } else if (typeof addStyle != 'undefined') {
  51.     addStyle(css);
  52.   } else {
  53.     var node = document.createElement('style');
  54.     node.type = 'text/css';
  55.     node.appendChild(document.createTextNode(css));
  56.     var heads = document.getElementsByTagName('head');
  57.     if (heads.length > 0) {
  58.       heads[0].appendChild(node);
  59.     } else {
  60.       // no head yet, stick it whereever
  61.       document.documentElement.appendChild(node);
  62.     }
  63.   }
  64. }) ();
  65.  
  66. var html = '<div id="savePNG">' +
  67.     '<span>There are max </span> ' +
  68.     '<input type="text" id="total" value="---" readonly> ' +
  69.     '<span>pages available. Input the page range to download </span> ' +
  70.     '<br>from<input type="text" id="count" value="0"> ' +
  71.     'to<input type="text" id="max" value="0"> ' +
  72.     '<span>.</span> ' +
  73.     '<button>Start</button>' +
  74.     '<input type="radio" name="saveAs" value="pdf" checked>pdf <input type="radio" name="saveAs" value="zip">zip'+
  75.     '</div>';
  76.  
  77. $('body').prepend(html);
  78.  
  79. $('#count').select();
  80.  
  81. var title, id, zipfile, zipname;
  82. var zipflag = false;
  83. var next = true;
  84. var zip = new JSZip();
  85. var pids = [];
  86.  
  87. var doc = new jsPDF();
  88. doc.deletePage(1);
  89.  
  90. var saveAsType='pdf';
  91.  
  92. $('#savePNG button').click(function(){
  93.   doTheMagic();
  94. })
  95.  
  96. $("#count").keyup(function(event){
  97.     if(event.keyCode == 13){
  98.         $("#savePNG button").click();
  99.     }
  100. });
  101.  
  102. function addPdfPage(imgStr) {
  103.   let u8a=doc.binaryStringToUint8Array(imgStr);
  104.   let prop=doc.getImageProperties (u8a);
  105.   doc.addPage([prop.width,prop.height]);
  106.   doc.addImage(u8a,prop.fileType,0,0);
  107. }
  108.  
  109. function savePdf(count, number){
  110.   
  111.   let name = title + '_' + id + '_' +
  112.     pad(count, number.toString().length) +
  113.     '_' + number + '.pdf';
  114.   
  115.   $('#savePNG button').prop('disabled', false).text('Start');
  116.   saveAs(doc.output('blob'), name);
  117. }
  118.  
  119. function addIMG(url, name, count) {
  120.   var filename = name + '.png';
  121.   $.ajax({
  122.     type: "GET",
  123.     //dataType: 'binary',
  124.     mimeType: "image/png; charset=x-user-defined",
  125.     async: true,
  126.     url: url,
  127.   }).done(function (data) {
  128.     try{
  129.       console.log(url);
  130.       $('#savePNG button').prop('disabled', true).text('Working…');
  131.       $('#count').val(count);
  132.       $('#count').css('font-weight', 'normal').css('text-decoration', 'none');
  133.       if(saveAsType==='zip'){
  134.         zip.file(filename, data, {binary: true});
  135.       }else{
  136.         addPdfPage(data);
  137.       }      
  138.       
  139.     }catch(e){
  140.     	console.error(e);
  141.     }
  142.   }).error(function(xhr,status,e){
  143.   	console.error(e);
  144.   });
  145.   return;
  146.   /*
  147.   GM.xmlhttpRequest({
  148.     method: 'GET',
  149.     synchronous: true,
  150.     url: url,
  151.     overrideMimeType: 'image/png; charset=x-user-defined',
  152.     onload: function (response) {
  153.       $('#savePNG button').prop('disabled', true).text('Working…');
  154.       $('#count').val(count);
  155.       $('#count').css('font-weight', 'normal').css('text-decoration', 'none');
  156.       zip.file(filename, response.responseText, {
  157.         binary: true
  158.       });
  159.     }
  160.   });
  161.   */
  162. }
  163.  
  164. function saveZip(count, number) {
  165.   zipname = title + '_' + id + '_' +
  166.     pad(count, number.toString().length) +
  167.     '_' + number + '.zip';
  168.   zipfile = zip.generate({
  169.     type: 'blob'
  170.   });
  171.   saveAs(zipfile, zipname);
  172. }
  173.  
  174. function save(count,number)
  175. {
  176.   if(saveAsType==='zip')
  177.   {
  178.     saveZip(count,number);
  179.   }else{
  180.     savePdf(count,number);
  181.   }
  182. }
  183.  
  184. function pad(num, size) {
  185.     var s = "000000000" + num;
  186.     return s.substr(s.length-size);
  187. }
  188.  
  189. function doTheMagic() {
  190.   
  191.   saveAsType=$('input[name="saveAs"]:checked').val();
  192.   
  193.   $('#savePNG button').prop('disabled', true);
  194.   var href = window.location.href;
  195.   var domain = href.split('/') [2];
  196.  
  197.   id = href.match(/id=([^&]+)/) [1];
  198.   title = $('title').text().split(' - ')[0].replace(/\s+/g,'_');
  199.  
  200.   var pid = 'PP1';
  201.   var count = parseInt($('#count').val());
  202.   var max = parseInt($('#max').val());
  203.   var url = 'https://' + domain + '/books?id=' + id + '&lpg=' + pid + '&pg=' + pid + '&jscmd=click3';
  204.  
  205.   
  206.   $.ajax({
  207.     dataType: 'json',
  208.     async: false,
  209.     url: url,
  210.   }).done(function (data) {
  211.     
  212.     pids = $.map(data.page, function (val, i) {
  213.       if (i > 3) {
  214.         return val.pid;
  215.       }
  216.     });
  217.   });
  218.  
  219.   var number = pids.length;
  220.   
  221.   $('#total').val(number);
  222. 	if(max===0) {
  223.     max=number;
  224.     $('#max').val(max);
  225.   }
  226.  
  227.   if (count >= number) {
  228.     alert('Wrong number of pages. There are only ' + number + ' available.');
  229.     $('#savePNG button').prop('disabled', false);
  230.   } else {
  231.     var i = count;
  232.     var timer = setInterval(function () {
  233.       if (i == max ||  i == number) {
  234.         clearInterval(timer);
  235.         alert('Downloaded every available page out of '+ number + ' total. Saving…');      
  236.         save(i, number);
  237.         return false;
  238.       }
  239.  
  240.       var url = 'https://' + domain + '/books?id=' + id + '&lpg=' + pids[i] + '&pg=' + pids[i] + '&jscmd=click3';
  241.       $.ajax({
  242.         dataType: 'json',
  243.         async: false,
  244.         url: url,
  245.       }).done(function (data) {
  246.         
  247.         if (data.page[0].hasOwnProperty('src') || data.page[0].flags == 8) {
  248.           var url = data.page[0].src + '&w=1600';
  249.           var name = pad((i+1), number.toString().length) + '_' + pids[i];
  250.  
  251.           if (data.page[0].flags == 8) {
  252.             $('#count').val(i + 1);
  253.             $('#count').css('font-weight', 'bold').css('text-decoration', 'line-through');
  254.           } else {
  255.             try{
  256.               addIMG(url, name, (i + 1));
  257.             }catch(e){
  258.             	console.log(e);
  259.             }
  260.             
  261.           }
  262.           i=i+1;
  263.  
  264.         } else {
  265.           clearInterval(timer);
  266.           alert('Can\'t download more.\n' +
  267.                 'Saving ' + i + ' out of ' + number + ' pages…\n' +
  268.                 'Change your IP and continue!');
  269.         	save(i, number);
  270.         }
  271.       });
  272.     }, 400);
  273.   }
  274. }