Finished (for now) projects module, with secure PDF viewer.

This commit is contained in:
naielv
2026-02-01 14:18:37 +01:00
parent de6cddf722
commit 6620980f02
5 changed files with 1112 additions and 64 deletions

View File

@@ -0,0 +1,286 @@
<?php
require_once "_incl/auth_redir.php";
$file = $_GET["file"] ?? "";
$file = trim($file);
$is_valid = false;
if ($file !== "") {
$parsed = parse_url($file);
if (!isset($parsed["scheme"]) && !isset($parsed["host"])) {
if (strpos($file, "/entreaulas/_filefetch.php") === 0) {
$is_valid = true;
}
}
}
if (!$is_valid) {
header("HTTP/1.1 400 Bad Request");
echo "URL de archivo no válida.";
exit;
}
?>
<!DOCTYPE html>
<html lang="es">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>PDF Seguro</title>
<style>
html, body {
margin: 0;
padding: 0;
background: #f5f5f5;
font-family: Arial, sans-serif;
color: #222;
height: 100%;
}
body {
display: flex;
flex-direction: column;
overflow: hidden;
}
.viewer-header {
padding: 10px 16px;
background: #fff3cd;
border-bottom: 1px solid #e0e0e0;
color: #000;
font-size: 14px;
}
.viewer-toolbar {
display: flex;
align-items: center;
gap: 8px;
padding: 8px 16px;
background: #ffffff;
border-bottom: 1px solid #e0e0e0;
position: sticky;
top: 0;
z-index: 5;
}
.viewer-toolbar button {
border: 1px solid #ccc;
background: #f8f9fa;
padding: 6px 10px;
border-radius: 4px;
cursor: pointer;
}
.viewer-toolbar button:disabled {
opacity: 0.6;
cursor: not-allowed;
}
.zoom-label {
font-weight: bold;
min-width: 64px;
}
.pdf-container {
padding: 12px;
display: flex;
flex-direction: column;
gap: 16px;
overflow-x: auto;
align-items: flex-start;
overflow-y: auto;
flex: 1 1 auto;
min-height: 0;
}
.page {
background: white;
box-shadow: 0 1px 3px rgba(0,0,0,0.2);
border-radius: 4px;
padding: 8px;
display: inline-block;
margin: 0 auto;
box-sizing: border-box;
}
canvas {
display: block;
height: auto;
}
.error {
padding: 16px;
color: #b00020;
}
</style>
</head>
<body>
<div class="viewer-header">
Este PDF se muestra en modo seguro. No se permite la descarga, impresión o copia del contenido.
</div>
<div class="viewer-toolbar">
<button type="button" id="zoom_out"></button>
<button type="button" id="zoom_reset">100%</button>
<button type="button" id="zoom_in">+</button>
<span class="zoom-label" id="zoom_label">100%</span>
</div>
<div class="pdf-container" id="pdf_container">
Cargando PDF...
</div>
<script>
(function () {
var pdfUrl = <?= json_encode($file, JSON_UNESCAPED_UNICODE) ?>;
var container = document.getElementById('pdf_container');
var CDN_BASES = [
'https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174',
'https://unpkg.com/pdfjs-dist@3.11.174/build'
];
function loadScript(src, onload, onerror) {
var s = document.createElement('script');
s.src = src;
s.onload = onload;
s.onerror = onerror;
document.head.appendChild(s);
}
var pdfDoc = null;
var currentScale = 1;
var minScale = 0.5;
var maxScale = 3;
var renderToken = 0;
function updateZoomLabel() {
var label = document.getElementById('zoom_label');
if (label) {
label.textContent = Math.round(currentScale * 100) + '%';
}
var resetBtn = document.getElementById('zoom_reset');
if (resetBtn) {
resetBtn.textContent = Math.round(currentScale * 100) + '%';
}
}
function clearContainer() {
container.innerHTML = '';
}
function renderAllPages(scale) {
if (!pdfDoc) return;
renderToken += 1;
var token = renderToken;
clearContainer();
var total = pdfDoc.numPages;
for (var i = 1; i <= total; i++) {
(function (pageNumber) {
pdfDoc.getPage(pageNumber).then(function (page) {
if (token !== renderToken) return;
var viewport = page.getViewport({ scale: scale });
var outputScale = window.devicePixelRatio || 1;
var canvas = document.createElement('canvas');
var context = canvas.getContext('2d');
canvas.width = Math.floor(viewport.width * outputScale);
canvas.height = Math.floor(viewport.height * outputScale);
canvas.style.width = Math.floor(viewport.width) + 'px';
canvas.style.height = 'auto';
var wrapper = document.createElement('div');
wrapper.className = 'page';
wrapper.appendChild(canvas);
container.appendChild(wrapper);
var renderContext = {
canvasContext: context,
viewport: page.getViewport({ scale: scale * outputScale })
};
page.render(renderContext);
});
})(i);
}
}
function getFitScale() {
if (!pdfDoc) return currentScale;
var availableWidth = Math.max(320, container.clientWidth || 0);
return pdfDoc.getPage(1).then(function (page) {
var viewport = page.getViewport({ scale: 1 });
var baseWidth = viewport.width || 1;
var fitScale = availableWidth / baseWidth;
fitScale = Math.min(maxScale, Math.max(minScale, fitScale));
return fitScale;
}).catch(function () {
return currentScale;
});
}
function initPdf() {
if (!window.pdfjsLib) {
container.innerHTML = '<div class="error">No se pudo cargar el visor PDF.</div>';
return;
}
pdfjsLib.getDocument(pdfUrl).promise.then(function (pdf) {
pdfDoc = pdf;
return getFitScale();
}).then(function (fitScale) {
currentScale = fitScale || 1;
updateZoomLabel();
renderAllPages(currentScale);
}).catch(function () {
container.innerHTML = '<div class="error">No se pudo cargar el PDF.</div>';
});
}
function tryLoad(index) {
if (index >= CDN_BASES.length) {
container.innerHTML = '<div class="error">No se pudo cargar el visor PDF.</div>';
return;
}
var base = CDN_BASES[index];
var scriptUrl = base + '/pdf.min.js';
var workerUrl = base + '/pdf.worker.min.js';
loadScript(scriptUrl, function () {
if (window.pdfjsLib) {
pdfjsLib.GlobalWorkerOptions.workerSrc = workerUrl;
}
initPdf();
}, function () {
tryLoad(index + 1);
});
}
tryLoad(0);
var zoomInBtn = document.getElementById('zoom_in');
var zoomOutBtn = document.getElementById('zoom_out');
var zoomResetBtn = document.getElementById('zoom_reset');
if (zoomInBtn) {
zoomInBtn.addEventListener('click', function () {
currentScale = Math.min(maxScale, currentScale + 0.1);
updateZoomLabel();
renderAllPages(currentScale);
});
}
if (zoomOutBtn) {
zoomOutBtn.addEventListener('click', function () {
currentScale = Math.max(minScale, currentScale - 0.1);
updateZoomLabel();
renderAllPages(currentScale);
});
}
if (zoomResetBtn) {
zoomResetBtn.addEventListener('click', function () {
getFitScale().then(function (fitScale) {
currentScale = fitScale || 1;
updateZoomLabel();
renderAllPages(currentScale);
});
});
}
var resizeTimer = null;
window.addEventListener('resize', function () {
if (resizeTimer) clearTimeout(resizeTimer);
resizeTimer = setTimeout(function () {
getFitScale().then(function (fitScale) {
currentScale = fitScale || currentScale;
updateZoomLabel();
renderAllPages(currentScale);
});
}, 200);
});
})();
</script>
</body>
</html>