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🔍 Sandcastle Builder Pro - Source Code

const express = require('express');
// VM2 3.9.16
const { VM } = require('vm2');
const app = express();
const port = 3000;

app.use(express.json());
app.use(express.urlencoded({ extended: true }));
app.use(express.static('public'));

// Serve the main page
app.get('/', (req, res) => {
    res.sendFile(__dirname + '/public/index.html');
});

// Source code endpoint - show developers how secure we are!
app.get('/source', (req, res) => {
    const fs = require('fs');
    const sourceCode = fs.readFileSync(__filename, 'utf8');

    res.send(`
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Source Code - Sandcastle Builder Pro</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
            background: linear-gradient(to bottom, #87CEEB 0%, #F4A460 60%, #C2B280 100%);
            min-height: 100vh;
            padding: 20px;
            color: #333;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background: rgba(255, 248, 220, 0.95);
            border-radius: 15px;
            padding: 30px;
            box-shadow: 0 10px 40px rgba(139, 69, 19, 0.3);
            border: 3px solid #D2B48C;
        }
        h1 {
            color: #A0522D;
            margin-bottom: 20px;
            text-align: center;
        }
        .info {
            background: #FFE4B5;
            padding: 15px;
            border-radius: 8px;
            margin-bottom: 20px;
            border: 2px solid #DEB887;
            color: #8B4513;
        }
        pre {
            background: #2d3436;
            color: #00ff00;
            padding: 20px;
            border-radius: 10px;
            overflow-x: auto;
            font-size: 14px;
            line-height: 1.5;
            border: 3px solid #654321;
        }
        .back-btn {
            display: inline-block;
            margin-bottom: 20px;
            padding: 10px 20px;
            background: linear-gradient(135deg, #FF8C00 0%, #FF6347 100%);
            color: white;
            text-decoration: none;
            border-radius: 8px;
            font-weight: bold;
        }
        .back-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(255, 140, 0, 0.6);
        }
    </style>
</head>
<body>
    <div class="container">
        <a href="/" class="back-btn">🏖️ Back to Sand Calculator</a>
        <h1>🔍 Sandcastle Builder Pro - Source Code</h1>
        <pre><code>${sourceCode.replace(/</g, '<').replace(/>/g, '>')}</code></pre>
    </div>
</body>
</html>
    `);
});

// API endpoint to execute code in sandbox
app.post('/api/execute', (req, res) => {
    const { code } = req.body;

    if (!code) {
        return res.status(400).json({
            error: 'No code provided',
            output: null
        });
    }

    try {
        const vm = new VM({
            timeout: 1000,
            sandbox: {
                Math: Math,
                Date: Date,
                console: {
                    log: (...args) => args.join(' ')
                }
            }
        });

        const result = vm.run(code);

        res.json({
            success: true,
            output: String(result),
            message: 'Sandcastle built successfully!'
        });

    } catch (error) {
        res.status(400).json({
            error: error.message,
            output: null
        });
    }
});

app.listen(port, '0.0.0.0', () => {
    console.log(`🏖️ Sandcastle Builder Pro running on port ${port} 🏰`);
});