Ocx File Download Review

// Initialize downloader when page loads document.addEventListener('DOMContentLoaded', () => new OCXDownloader(); ); </script> </body> </html> // app.js const express = require('express'); const cors = require('cors'); const path = require('path'); const ocxRoutes = require('./routes/ocxDownload'); const app = express(); const PORT = process.env.PORT || 3000;

// Stream the file const fileStream = fs.createReadStream(filePath); fileStream.pipe(res); ocx file download

// Middleware app.use(cors()); app.use(express.json()); app.use(express.static('public'));

// Check if file exists if (!fs.existsSync(filePath)) return res.status(404).json( error: 'OCX file not found' ); // Initialize downloader when page loads document

Backend (Node.js/Express) // routes/ocxDownload.js const express = require('express'); const path = require('path'); const fs = require('fs'); const router = express.Router(); // Endpoint to download OCX file router.get('/download-ocx/:filename', (req, res) => const filename = req.params.filename;

async init() await this.loadFileList(); async loadFileList() const fileListDiv = document.getElementById('fileList'); try const response = await fetch(`$this.apiBase/ocx-files`); if (!response.ok) throw new Error('Failed to load file list'); const files = await response.json(); if (files.length === 0) fileListDiv.innerHTML = '<div class="status info">No OCX files available</div>'; return; fileListDiv.innerHTML = files.map(file => this.createFileItem(file)).join(''); // Attach download handlers files.forEach(file => const btn = document.getElementById(`download-$this.sanitizeId(file.name)`); if (btn) btn.addEventListener('click', () => this.downloadFile(file.name)); ); catch (error) console.error('Error loading files:', error); fileListDiv.innerHTML = '<div class="status error">Error loading file list</div>'; createFileItem(file) Modified: $date</div> </div> <button id="download-$this.sanitizeId(file.name)">Download</button> </div> `; async downloadFile(filename) const statusDiv = document.getElementById('status'); const downloadBtn = document.querySelector(`#download-$this.sanitizeId(filename)`); // Disable button during download if (downloadBtn) downloadBtn.disabled = true; downloadBtn.textContent = 'Downloading...'; this.showStatus('Downloading...', 'info'); try const response = await fetch(`$this.apiBase/download-ocx/$encodeURIComponent(filename)`); if (!response.ok) 'Download failed'); // Get file size from headers const contentLength = response.headers.get('content-length'); let downloaded = 0; // Create readable stream for progress tracking const reader = response.body.getReader(); const chunks = []; while (true) const done, value = await reader.read(); if (done) break; chunks.push(value); downloaded += value.length; if (contentLength) const progress = (downloaded / parseInt(contentLength)) * 100; this.updateProgress(progress); // Combine chunks into blob const blob = new Blob(chunks); // Trigger download const url = window.URL.createObjectURL(blob); const a = document.createElement('a'); a.href = url; a.download = filename; document.body.appendChild(a); a.click(); document.body.removeChild(a); window.URL.revokeObjectURL(url); this.showStatus(`✅ $filename downloaded successfully!`, 'success'); this.updateProgress(0); catch (error) console.error('Download error:', error); this.showStatus(`❌ Error: $error.message`, 'error'); finally if (downloadBtn) downloadBtn.disabled = false; downloadBtn.textContent = 'Download'; setTimeout(() => this.hideProgress(), 2000); updateProgress(percent) hideProgress() const progressBar = document.querySelector('.progress-bar'); if (progressBar) progressBar.remove(); showStatus(message, type) const statusDiv = document.getElementById('status'); statusDiv.textContent = message; statusDiv.className = `status $type`; statusDiv.style.display = 'block'; if (type === 'success') setTimeout(() => statusDiv.style.display = 'none'; , 5000); sanitizeId(str) return str.replace(/[^a-zA-Z0-9]/g, '-'); escapeHtml(str) const div = document.createElement('div'); div.textContent = str; return div.innerHTML; // app.js const express = require('express')

<h3>Available OCX Files</h3> <div id="fileList" class="file-list"> <div class="status info" style="display: block;">Loading available files...</div> </div>

// OCX download routes app.use('/api', ocxRoutes);

fileStream.on('error', (err) => console.error('Download error:', err); res.status(500).json( error: 'Download failed' ); ); );