PDF.js禁止打印和下载，含后台权限控制

xnian_

已于 2023-04-11 18:38:31 修改

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分类专栏： java PDF 文章标签： javascript ajax jquery js 前端

于 2021-05-07 15:00:24 首次发布

本文链接：https://blog.youkuaiyun.com/xnian_/article/details/116493357

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该博客介绍了如何在PDF中通过JavaScript实现禁止打印和下载的功能。具体方法包括覆盖默认的window.print()函数，阻止打印操作，并通过AJAX请求进行权限验证。同时，也修改了下载函数，添加同样的权限验证，确保只有在允许的情况下才能执行下载。此方法适用于PDF.js库，增加了PDF的安全性和可控性。

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PDF添加水印链接https://blog.youkuaiyun.com/xnian_/article/details/116492819?utm_source%20=%20uc_fansmsg

viewer.js中添加

1. 禁止打印搜索window.print = function print(){}在这个下面写调用方法

var print = window.print;
  window.print = function print() {
      $.ajax({
          url: "/pdfDizDisableFunction/disablePdfDownAndPrint",
          data: {
              isQueryCon: isQueryCon
          },
          success: function(data){
            if(data.flag==false){
                window.top.alert(data.msg, 1);
              return;
            }else{
                if (canvases) {
                    console.warn('Ignored window.print() because of a pending print job.');
                    return;
                }
                try {
                    dispatchEvent('beforeprint');
                } finally {
                    canvases = document.querySelectorAll('canvas');
                    index = -1;
                    next();
                }
            }
          }
      });
  };

2.禁止下载(function (root, factory) {
{
factory((root.pdfjsWebDownloadManager = {}), root.pdfjsWebPDFJS);
}
}(this, function (exports, pdfjsLib) {
function download(blobUrl, filename) {}在这个下面写调用方法

(function (root, factory) {
  {
    factory((root.pdfjsWebDownloadManager = {}), root.pdfjsWebPDFJS);
  }
}(this, function (exports, pdfjsLib) {
    function download(blobUrl, filename) {
        $.ajax({
              url: "/pdfDizDisableFunction/disablePdfDownAndPrint",
              data: {
                  isQueryCon: isQueryCon
              },
              success: function(data){
                if (data.flag==false) {
                    window.top.alert(data.msg, 1);
                  return;
                }else {
                    var a = document.createElement('a');
                    if (a.click) {
                        // Use a.click() if available. Otherwise, Chrome might show
                        // "Unsafe JavaScript attempt to initiate a navigation change
                        //  for frame with URL" and not open the PDF at all.
                        // Supported by (not mentioned = untested):
                        // - Firefox 6 - 19 (4- does not support a.click, 5 ignores a.click)
                        // - Chrome 19 - 26 (18- does not support a.click)
                        // - Opera 9 - 12.15
                        // - Internet Explorer 6 - 10
                        // - Safari 6 (5.1- does not support a.click)
                        a.href = blobUrl;
                        a.target = '_parent';
                        // Use a.download if available. This increases the likelihood that
                        // the file is downloaded instead of opened by another PDF plugin.
                        if ('download' in a) {
                            a.download = filename;
                        }
                        // <a> must be in the document for IE and recent Firefox versions.
                        // (otherwise .click() is ignored)
                        (document.body || document.documentElement).appendChild(a);
                        a.click();
                        a.parentNode.removeChild(a);
                    } else {
                        if (window.top === window &&
                            blobUrl.split('#')[0] === window.location.href.split('#')[0]) {
                            // If _parent == self, then opening an identical URL with different
                            // location hash will only cause a navigation, not a download.
                            var padCharacter = blobUrl.indexOf('?') === -1 ? '?' : '&';
                            blobUrl = blobUrl.replace(/#|$/, padCharacter + '$&');
                        }
                        window.open(blobUrl, '_parent');
                    }
                }
              }
          });

  }