ftp-server/server.js at main · devkumar2121/ftp-server · GitHub

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const express = require("express");
const multer = require("multer");
const fs = require("fs");
const path = require("path");
const os = require("os");

const app = express();
const PORT = 3000;
const UPLOAD_DIR = path.join(__dirname, "uploads");

// Create upload directory
if (!fs.existsSync(UPLOAD_DIR)) {
  fs.mkdirSync(UPLOAD_DIR, { recursive: true });
}

// Configure multer for file uploads
const storage = multer.diskStorage({
  destination: (req, file, cb) => {
    cb(null, UPLOAD_DIR);
  },
  filename: (req, file, cb) => {
    cb(null, file.originalname);
  },
});

const upload = multer({ storage });

// Get local IP address
function getLocalIP() {
  const interfaces = os.networkInterfaces();
  for (let iface of Object.values(interfaces)) {
    for (let alias of iface) {
      if (alias.family === "IPv4" && !alias.internal) {
        return alias.address;
      }
    }
  }
  return "localhost";
}

// Serve HTML interface
app.get("/", (req, res) => {
  res.send(`
    <!DOCTYPE html>
    <html>
    <head>
      <title>File Server</title>
      <style>
        body {
          font-family: Arial, sans-serif;
          max-width: 800px;
          margin: 50px auto;
          padding: 20px;
          background: #f5f5f5;
        }
        .container {
          background: white;
          padding: 30px;
          border-radius: 10px;
          box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        h1 { color: #333; }
        h2 { color: #666; margin-top: 30px; }
        .upload-form {
          border: 2px dashed #ccc;
          padding: 20px;
          border-radius: 5px;
          text-align: center;
        }
        input[type="file"] {
          margin: 10px 0;
        }
        button {
          background: #4CAF50;
          color: white;
          padding: 10px 20px;
          border: none;
          border-radius: 5px;
          cursor: pointer;
          font-size: 16px;
        }
        button:hover {
          background: #45a049;
        }
        .file-list {
          margin-top: 20px;
        }
        .file-item {
          background: #f9f9f9;
          padding: 15px;
          margin: 10px 0;
          border-radius: 5px;
          display: flex;
          justify-content: space-between;
          align-items: center;
        }
        .file-info {
          flex: 1;
        }
        .file-name {
          font-weight: bold;
          color: #333;
        }
        .file-size {
          color: #666;
          font-size: 14px;
        }
        .download-btn {
          background: #2196F3;
          padding: 8px 15px;
          text-decoration: none;
          color: white;
          border-radius: 5px;
        }
        .download-btn:hover {
          background: #0b7dda;
        }
        .status {
          padding: 10px;
          margin: 10px 0;
          border-radius: 5px;
        }
        .success {
          background: #d4edda;
          color: #155724;
        }
        .error {
          background: #f8d7da;
          color: #721c24;
        }
      </style>
    </head>
    <body>
      <div class="container">
        <h1>📁 Network File Server</h1>

        <h2>Upload Files</h2>
        <div class="upload-form">
          <form id="uploadForm" enctype="multipart/form-data">
            <input type="file" name="file" id="fileInput" required>
            <br>
            <button type="submit">Upload File</button>
          </form>
          <div id="status"></div>
        </div>

        <h2>Available Files</h2>
        <div class="file-list" id="fileList">
          Loading files...
        </div>
      </div>

      <script>
        // Upload file
        document.getElementById('uploadForm').addEventListener('submit', async (e) => {
          e.preventDefault();
          const formData = new FormData();
          const fileInput = document.getElementById('fileInput');
          formData.append('file', fileInput.files[0]);

          const status = document.getElementById('status');
          status.innerHTML = 'Uploading...';

          try {
            const response = await fetch('/upload', {
              method: 'POST',
              body: formData
            });
            const result = await response.json();

            if (response.ok) {
              status.className = 'status success';
              status.innerHTML = '✓ ' + result.message;
              fileInput.value = '';
              loadFiles();
            } else {
              status.className = 'status error';
              status.innerHTML = '✗ ' + result.message;
            }
          } catch (error) {
            status.className = 'status error';
            status.innerHTML = '✗ Upload failed';
          }
        });

        // Load file list
        async function loadFiles() {
          try {
            const response = await fetch('/list');
            const files = await response.json();

            const fileList = document.getElementById('fileList');

            if (files.length === 0) {
              fileList.innerHTML = '<p style="color: #999;">No files uploaded yet</p>';
              return;
            }

            fileList.innerHTML = files.map(file => \`
              <div class="file-item">
                <div class="file-info">
                  <div class="file-name">\${file.name}</div>
                  <div class="file-size">\${formatSize(file.size)} • \${new Date(file.modified).toLocaleString()}</div>
                </div>
                <a href="/download/\${encodeURIComponent(file.name)}" class="download-btn" download>Download</a>
              </div>
            \`).join('');
          } catch (error) {
            document.getElementById('fileList').innerHTML = '<p style="color: red;">Error loading files</p>';
          }
        }

        function formatSize(bytes) {
          if (bytes < 1024) return bytes + ' B';
          if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(2) + ' KB';
          return (bytes / (1024 * 1024)).toFixed(2) + ' MB';
        }

        // Load files on page load
        loadFiles();
      </script>
    </body>
    </html>
  `);
});

// Upload route
app.post("/upload", upload.single("file"), (req, res) => {
  if (!req.file) {
    return res.status(400).json({ message: "No file uploaded" });
  }
  console.log(
    `✓ File uploaded: ${req.file.originalname} (${req.file.size} bytes)`
  );
  res.json({
    message: "File uploaded successfully",
    filename: req.file.originalname,
  });
});

// List all files
app.get("/list", (req, res) => {
  fs.readdir(UPLOAD_DIR, (err, files) => {
    if (err) {
      return res.status(500).json({ message: "Error reading directory" });
    }

    const fileDetails = files.map((file) => {
      const filePath = path.join(UPLOAD_DIR, file);
      const stats = fs.statSync(filePath);
      return {
        name: file,
        size: stats.size,
        modified: stats.mtime,
      };
    });

    res.json(fileDetails);
  });
});

// Download route
app.get("/download/:filename", (req, res) => {
  const filename = req.params.filename;
  const filePath = path.join(UPLOAD_DIR, filename);

  // Security check
  if (!filePath.startsWith(UPLOAD_DIR)) {
    return res.status(403).send("Access denied");
  }

  if (!fs.existsSync(filePath)) {
    return res.status(404).send("File not found");
  }

  console.log(`✓ File downloaded: ${filename}`);
  res.download(filePath);
});

// Start server
const localIP = getLocalIP();
app.listen(PORT, "0.0.0.0", () => {
  console.log("=====================================");
  console.log("Network File Server Started!");
  console.log("=====================================");
  console.log(`Local access:   http://localhost:${PORT}`);
  console.log(`Network access: http://${localIP}:${PORT}`);
  console.log(`Upload folder: ${UPLOAD_DIR}`);
  console.log("=====================================");
  console.log("\nShare this address with others on your network:");
  console.log(`👉 http://${localIP}:${PORT}`);
  console.log("=====================================\n");
});