Folder sharing added

downloadSharedFile.php

@@ -0,0 +1,89 @@
+<?php
+// downloadSharedFile.php
+
+require_once 'config.php';
+
+// Retrieve and sanitize token and file name from GET.
+$token = filter_input(INPUT_GET, 'token', FILTER_SANITIZE_STRING);
+$file = filter_input(INPUT_GET, 'file', FILTER_SANITIZE_STRING);
+
+if (empty($token) || empty($file)) {
+    http_response_code(400);
+    echo "Missing token or file parameter.";
+    exit;
+}
+
+// Load the share folder records.
+$shareFile = META_DIR . "share_folder_links.json";
+if (!file_exists($shareFile)) {
+    http_response_code(404);
+    echo "Share link not found.";
+    exit;
+}
+
+$shareLinks = json_decode(file_get_contents($shareFile), true);
+if (!is_array($shareLinks) || !isset($shareLinks[$token])) {
+    http_response_code(404);
+    echo "Share link not found.";
+    exit;
+}
+
+$record = $shareLinks[$token];
+
+// Check if the link has expired.
+if (time() > $record['expires']) {
+    http_response_code(403);
+    echo "This share link has expired.";
+    exit;
+}
+
+// Get the shared folder from the record.
+$folder = trim($record['folder'], "/\\ ");
+$folderPath = rtrim(UPLOAD_DIR, '/\\') . DIRECTORY_SEPARATOR . $folder;
+$realFolderPath = realpath($folderPath);
+$uploadDirReal = realpath(UPLOAD_DIR);
+
+if ($realFolderPath === false || strpos($realFolderPath, $uploadDirReal) !== 0 || !is_dir($realFolderPath)) {
+    http_response_code(404);
+    echo "Shared folder not found.";
+    exit;
+}
+
+// Sanitize the filename to prevent directory traversal.
+if (strpos($file, "/") !== false || strpos($file, "\\") !== false) {
+    http_response_code(400);
+    echo "Invalid file name.";
+    exit;
+}
+$file = basename($file);
+
+// Build the full file path and verify it is inside the shared folder.
+$filePath = $realFolderPath . DIRECTORY_SEPARATOR . $file;
+$realFilePath = realpath($filePath);
+if ($realFilePath === false || strpos($realFilePath, $realFolderPath) !== 0 || !is_file($realFilePath)) {
+    http_response_code(404);
+    echo "File not found.";
+    exit;
+}
+
+// Determine MIME type.
+$mimeType = mime_content_type($realFilePath);
+header("Content-Type: " . $mimeType);
+
+// Set Content-Disposition header.
+// Inline if the file is an image; attachment for others.
+$ext = strtolower(pathinfo($realFilePath, PATHINFO_EXTENSION));
+if (in_array($ext, ['jpg','jpeg','png','gif','bmp','webp','svg','ico'])) {
+    header('Content-Disposition: inline; filename="' . basename($realFilePath) . '"');
+} else {
+    header('Content-Disposition: attachment; filename="' . basename($realFilePath) . '"');
+}
+
+// Disable caching.
+header("Cache-Control: no-store, no-cache, must-revalidate");
+header("Pragma: no-cache");
+
+// Read and output the file.
+readfile($realFilePath);
+exit;
+?>