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PDF Viewer Embedder

Embeds PDFs directly in the page instead of downloading if it is stored on the same domain

当前为 2025-04-29 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name         PDF Viewer Embedder
  3. // @namespace    *
  4. // @version      1.0
  5. // @author       zinchaiku
  6. // @description  Embeds PDFs directly in the page instead of downloading if it is stored on the same domain
  7. // @match        *://*/*
  8. // @grant        none
  9. // @license      MIT
  10. // ==/UserScript==
  11.  
  12. (function () {
  13.     'use strict';
  14.  
  15.     // Helper to create and insert the PDF viewer
  16.     function showPDF(blobUrl) {
  17.         // Remove any existing viewer
  18.         let existing = document.getElementById('tampermonkey-pdf-viewer');
  19.         if (existing) existing.remove();
  20.  
  21.         // Create overlay
  22.         const overlay = document.createElement('div');
  23.         overlay.id = 'tampermonkey-pdf-viewer';
  24.         overlay.style.position = 'fixed';
  25.         overlay.style.top = 0;
  26.         overlay.style.left = 0;
  27.         overlay.style.width = '100vw';
  28.         overlay.style.height = '100vh';
  29.         overlay.style.background = 'rgba(0,0,0,0.8)';
  30.         overlay.style.zIndex = 99999;
  31.         overlay.style.display = 'flex';
  32.         overlay.style.alignItems = 'center';
  33.         overlay.style.justifyContent = 'center';
  34.  
  35.         // Create iframe
  36.         const iframe = document.createElement('iframe');
  37.         iframe.src = blobUrl;
  38.         iframe.title = "Embedded PDF Viewer";
  39.         iframe.style.width = '80vw';
  40.         iframe.style.height = '90vh';
  41.         iframe.style.border = 'none';
  42.         iframe.style.background = '#fff';
  43.         overlay.appendChild(iframe);
  44.  
  45.         // Close button
  46.         const closeBtn = document.createElement('button');
  47.         closeBtn.textContent = 'Close PDF';
  48.         closeBtn.style.position = 'absolute';
  49.         closeBtn.style.top = '20px';
  50.         closeBtn.style.right = '40px';
  51.         closeBtn.style.zIndex = 100000;
  52.         closeBtn.style.padding = '2px 6px';
  53.         closeBtn.style.fontSize = '1.2em';
  54.         closeBtn.onclick = () => {
  55.             overlay.remove();
  56.             URL.revokeObjectURL(blobUrl);
  57.         };
  58.         overlay.appendChild(closeBtn);
  59.  
  60.         document.body.appendChild(overlay);
  61.     }
  62.  
  63.     // Attach to all download links (adjust selector as needed)
  64.     function attachPDFInterceptors() {
  65.         document.querySelectorAll('a[href$=".pdf"], a[href*="_download.html"]').forEach(link => {
  66.             // Avoid double-binding
  67.             if (link.dataset.tmPdfBound) return;
  68.             link.dataset.tmPdfBound = "1";
  69.  
  70.             link.addEventListener('click', function(e) {
  71.     e.preventDefault();
  72.  
  73.     const linkHost = new URL(link.href).host;
  74.     const sameOrigin = linkHost === window.location.host;
  75.  
  76.     // Use fetch only for same-origin links (like ILIAS downloads)
  77.     if (sameOrigin) {
  78.         fetch(link.href, { credentials: 'include' })
  79.             .then(res => {
  80.                 const contentType = res.headers.get('Content-Type') || '';
  81.                 if (contentType.includes('pdf')) {
  82.                     return res.blob().then(blob => {
  83.                         const blobUrl = URL.createObjectURL(blob);
  84.                         showPDF(blobUrl);
  85.                     });
  86.                 } else {
  87.                     window.location.href = link.href;
  88.                 }
  89.             })
  90.             .catch(err => {
  91.                 alert("Could not open PDF: " + err);
  92.                 window.location.href = link.href;
  93.             });
  94.     } else {
  95.         // External .pdf link — open in a new tab
  96.         window.open(link.href, '_blank');
  97.     }
  98. });
  99.         });
  100.     }
  101.     window.addEventListener('keydown', (e) => {
  102.     if (e.key === 'Escape') {
  103.         const viewer = document.getElementById('tampermonkey-pdf-viewer');
  104.         if (viewer) {
  105.             const iframe = viewer.querySelector('iframe');
  106.             if (iframe?.src?.startsWith('blob:')) {
  107.                 URL.revokeObjectURL(iframe.src);
  108.             }
  109.             viewer.remove();
  110.         }
  111.     }
  112. });
  113.  
  114.     // Run on page load and after AJAX navigation (if any)
  115.     attachPDFInterceptors();
  116.     // Optional: observe DOM changes for dynamically loaded links
  117.     const observer = new MutationObserver(attachPDFInterceptors);
  118.     observer.observe(document.body, { childList: true, subtree: true });
  119. })();