Download file in chunks

frontend/index.html

@@ -44,6 +44,12 @@
       <div class="upload-container">
         <div class="status" id="downloadStatus">Загрузка...</div>
         <div id="downloadContent"></div>
+        <div id="downloadProgress" class="download-progress" style="display: none;">
+          <div class="progress-bar-container">
+            <div class="progress-bar" id="progressBar"></div>
+          </div>
+          <p class="progress-text" id="progressText">0%</p>
+        </div>
       </div>
     </div>
   </div>

frontend/script.js

@@ -72,16 +72,61 @@ async function handleDownloadPage(fileUuid) {
     }
     
     const fileData = data.result.data;
+    const fileSize = parseInt(fileData.file_size);
     
-    // Create download button handler
+    // Create download button handler with progress tracking
     const handleDownload = async () => {
+      const downloadButton = document.getElementById('downloadButton');
+      const downloadProgress = document.getElementById('downloadProgress');
+      const progressBar = document.getElementById('progressBar');
+      const progressText = document.getElementById('progressText');
+      
+      // For small files (< 10MB), use direct download (browser's native download)
+      // For larger files, show progress bar
+      if (fileSize < 10 * 1024 * 1024) {
+        // Small file - use direct download with browser's native progress
+        const link = document.createElement('a');
+        link.href = fileData.url;
+        link.download = fileData.file_name;
+        document.body.appendChild(link);
+        link.click();
+        document.body.removeChild(link);
+        return;
+      }
+      
+      // Large file - download with progress tracking
       try {
-        // For presigned URLs, we fetch the file and create a blob URL
+        downloadButton.disabled = true;
+        downloadProgress.style.display = 'block';
+        progressBar.style.width = '0%';
+        progressText.textContent = '0%';
+        
         const response = await fetch(fileData.url);
         if (!response.ok) {
           throw new Error('Ошибка при загрузке файла');
         }
-        const blob = await response.blob();
+        
+        const contentLength = response.headers.get('content-length');
+        const total = contentLength ? parseInt(contentLength, 10) : fileSize;
+        let loaded = 0;
+        
+        const reader = response.body.getReader();
+        const chunks = [];
+        
+        while (true) {
+          const { done, value } = await reader.read();
+          if (done) break;
+          
+          chunks.push(value);
+          loaded += value.length;
+          
+          const percent = Math.round((loaded / total) * 100);
+          progressBar.style.width = percent + '%';
+          progressText.textContent = `${percent}% (${formatBytes(loaded)} / ${formatBytes(total)})`;
+        }
+        
+        // Combine chunks into blob
+        const blob = new Blob(chunks);
         const blobUrl = window.URL.createObjectURL(blob);
         
         const link = document.createElement('a');
@@ -91,9 +136,18 @@ async function handleDownloadPage(fileUuid) {
         link.click();
         document.body.removeChild(link);
         
-        // Clean up the blob URL
+        // Clean up
         window.URL.revokeObjectURL(blobUrl);
+        downloadProgress.style.display = 'none';
+        downloadButton.disabled = false;
+        progressText.textContent = 'Загрузка завершена!';
+        
+        setTimeout(() => {
+          progressText.textContent = '';
+        }, 2000);
       } catch (error) {
+        downloadProgress.style.display = 'none';
+        downloadButton.disabled = false;
         // Fallback: try direct navigation
         window.location.href = fileData.url;
       }

frontend/style.css

@@ -333,3 +333,33 @@ button:disabled {
   transform: translateY(-1px);
   box-shadow: 0 8px 16px -4px rgba(99, 102, 241, 0.4);
 }
+
+/* Download progress */
+.download-progress {
+  margin-top: 24px;
+  text-align: center;
+}
+
+.progress-bar-container {
+  width: 100%;
+  height: 8px;
+  background: #e5e7eb;
+  border-radius: 4px;
+  overflow: hidden;
+  margin-bottom: 12px;
+}
+
+.progress-bar {
+  height: 100%;
+  background: linear-gradient(90deg, #6366f1, #8b5cf6);
+  border-radius: 4px;
+  transition: width 0.3s ease;
+  width: 0%;
+}
+
+.progress-text {
+  font-size: 14px;
+  color: #6b7280;
+  margin: 0;
+  font-weight: 500;
+}