contract-downloader-simple/index.html at main · mamolas/contract-downloader-simple · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Smart Contract Downloader - Etherscan API V2</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }

        .container {
            background: white;
            border-radius: 20px;
            padding: 40px;
            max-width: 600px;
            width: 100%;
            box-shadow: 0 20px 60px rgba(0,0,0,0.3);
        }

        h1 {
            color: #333;
            margin-bottom: 10px;
            font-size: 28px;
        }

        .subtitle {
            color: #666;
            margin-bottom: 30px;
            font-size: 14px;
        }

        .form-group {
            margin-bottom: 20px;
        }

        label {
            display: block;
            margin-bottom: 8px;
            color: #333;
            font-weight: 600;
            font-size: 14px;
        }

        input, select {
            width: 100%;
            padding: 12px 16px;
            border: 2px solid #e0e0e0;
            border-radius: 8px;
            font-size: 14px;
            transition: border-color 0.3s;
        }

        input:focus, select:focus {
            outline: none;
            border-color: #667eea;
        }

        .custom-chain {
            display: none;
            margin-top: 10px;
        }

        .custom-chain.show {
            display: block;
        }

        button {
            width: 100%;
            padding: 14px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.2s, box-shadow 0.2s;
        }

        button:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(102, 126, 234, 0.4);
        }

        button:active {
            transform: translateY(0);
        }

        button:disabled {
            background: #ccc;
            cursor: not-allowed;
            transform: none;
        }

        .status {
            margin-top: 20px;
            padding: 12px;
            border-radius: 8px;
            font-size: 14px;
            display: none;
        }

        .status.show {
            display: block;
        }

        .status.loading {
            background: #fff3cd;
            color: #856404;
            border: 1px solid #ffeaa7;
        }

        .status.success {
            background: #d4edda;
            color: #155724;
            border: 1px solid #c3e6cb;
        }

        .status.error {
            background: #f8d7da;
            color: #721c24;
            border: 1px solid #f5c6cb;
        }

        .info {
            background: #e7f3ff;
            padding: 15px;
            border-radius: 8px;
            margin-bottom: 20px;
            font-size: 13px;
            color: #004085;
        }

        .info a {
            color: #667eea;
            text-decoration: none;
            font-weight: 600;
        }

        .info a:hover {
            text-decoration: underline;
        }

        .footer {
            text-align: center;
            margin-top: 30px;
            color: #666;
            font-size: 12px;
        }

        .footer a {
            color: #667eea;
            text-decoration: none;
        }
    </style>
</head>
<body>
    <div class="container">
        <h1>📦 Smart Contract Downloader</h1>
        <p class="subtitle">Download verified contracts from 50+ EVM chains using Etherscan API V2</p>

        <div class="info">
            ℹ️ Get your free API key at <a href="https://etherscan.io/myapikey" target="_blank">Etherscan.io</a>. One key works for all chains!
        </div>

        <form id="downloadForm">
            <div class="form-group">
                <label for="apiKey">Etherscan API Key</label>
                <input type="text" id="apiKey" placeholder="Your Etherscan API key" required>
            </div>

            <div class="form-group">
                <label for="network">Network</label>
                <select id="network" required>
                    <option value="1">Ethereum Mainnet</option>
                    <option value="56">BNB Smart Chain</option>
                    <option value="137">Polygon</option>
                    <option value="8453">Base</option>
                    <option value="42161">Arbitrum One</option>
                    <option value="10">Optimism</option>
                    <option value="43114">Avalanche C-Chain</option>
                    <option value="59144">Linea</option>
                    <option value="81457">Blast</option>
                    <option value="custom">🔧 Custom Chain ID...</option>
                </select>

                <div id="customChainInput" class="custom-chain">
                    <input type="number" id="customChainId" placeholder="Enter custom chain ID (e.g., 534352 for Scroll)" min="1">
                </div>
            </div>

            <div class="form-group">
                <label for="contractAddress">Contract Address</label>
                <input type="text" id="contractAddress" placeholder="0x..." pattern="^0x[a-fA-F0-9]{40}$" required>
            </div>

            <button type="submit" id="downloadBtn">Download Contract</button>
        </form>

        <div id="status" class="status"></div>

        <div class="footer">
            Made with 💜 for the community | <a href="https://github.com/mamolas/contract-downloader-simple" target="_blank">View on GitHub</a>
        </div>
    </div>

    <script src="https://cdnjs.cloudflare.com/ajax/libs/jszip/3.10.1/jszip.min.js"></script>
    <script>
        const form = document.getElementById('downloadForm');
        const networkSelect = document.getElementById('network');
        const customChainInput = document.getElementById('customChainInput');
        const customChainId = document.getElementById('customChainId');
        const statusDiv = document.getElementById('status');
        const downloadBtn = document.getElementById('downloadBtn');

        // Show/hide custom chain input
        networkSelect.addEventListener('change', function() {
            if (this.value === 'custom') {
                customChainInput.classList.add('show');
                customChainId.required = true;
            } else {
                customChainInput.classList.remove('show');
                customChainId.required = false;
            }
        });

        // Show status message
        function showStatus(message, type) {
            statusDiv.textContent = message;
            statusDiv.className = `status show ${type}`;
        }

        // Hide status message
        function hideStatus() {
            statusDiv.className = 'status';
        }

        // Download contract
        async function downloadContract(chainId, contractAddress, apiKey) {
            showStatus('🔍 Fetching contract from blockchain...', 'loading');
            downloadBtn.disabled = true;

            try {
                const url = `https://api.etherscan.io/v2/api?chainid=${chainId}&module=contract&action=getsourcecode&address=${contractAddress}&apikey=${apiKey}`;

                const response = await fetch(url);
                const data = await response.json();

                if (data.status !== '1' || !data.result || !data.result[0]) {
                    throw new Error(data.message || 'Failed to fetch contract');
                }

                const contract = data.result[0];

                if (!contract.SourceCode || contract.SourceCode === '') {
                    throw new Error('Contract is not verified on this network');
                }

                showStatus('📦 Creating ZIP file...', 'loading');

                // Create ZIP file
                const zip = new JSZip();

                // Parse source code
                let sourceCode = contract.SourceCode;

                // Check if it's a multi-file contract (starts with {{ or {)
                if (sourceCode.startsWith('{{')) {
                    sourceCode = sourceCode.slice(1, -1);
                }

                try {
                    // Try to parse as JSON (multi-file contract)
                    const sources = JSON.parse(sourceCode);

                    if (sources.sources) {
                        // Solidity Standard JSON format
                        Object.keys(sources.sources).forEach(filePath => {
                            zip.file(filePath, sources.sources[filePath].content);
                        });
                    } else {
                        // Alternative format
                        Object.keys(sources).forEach(filePath => {
                            zip.file(filePath, sources[filePath].content || sources[filePath]);
                        });
                    }
                } catch (e) {
                    // Single file contract
                    const fileName = `${contract.ContractName}.sol`;
                    zip.file(fileName, sourceCode);
                }

                // Add metadata
                const metadata = {
                    contractName: contract.ContractName,
                    contractAddress: contractAddress,
                    chainId: chainId,
                    compiler: contract.CompilerVersion,
                    optimization: contract.OptimizationUsed === '1',
                    runs: contract.Runs,
                    constructorArguments: contract.ConstructorArguments,
                    evmVersion: contract.EVMVersion,
                    library: contract.Library,
                    licenseType: contract.LicenseType,
                    proxy: contract.Proxy,
                    implementation: contract.Implementation,
                    swarmSource: contract.SwarmSource,
                    downloadedAt: new Date().toISOString(),
                };

                zip.file('metadata.json', JSON.stringify(metadata, null, 2));

                // Generate ZIP
                const blob = await zip.generateAsync({ type: 'blob' });

                // Download
                const downloadUrl = URL.createObjectURL(blob);
                const a = document.createElement('a');
                a.href = downloadUrl;
                a.download = `${contract.ContractName}_${contractAddress.slice(0, 10)}_chain${chainId}.zip`;
                document.body.appendChild(a);
                a.click();
                document.body.removeChild(a);
                URL.revokeObjectURL(downloadUrl);

                showStatus(`✅ Successfully downloaded ${contract.ContractName}!`, 'success');

            } catch (error) {
                showStatus(`❌ Error: ${error.message}`, 'error');
            } finally {
                downloadBtn.disabled = false;
            }
        }

        // Form submission
        form.addEventListener('submit', function(e) {
            e.preventDefault();

            const apiKey = document.getElementById('apiKey').value.trim();
            const contractAddress = document.getElementById('contractAddress').value.trim();
            let chainId = networkSelect.value;

            if (chainId === 'custom') {
                chainId = customChainId.value.trim();
                if (!chainId) {
                    showStatus('❌ Please enter a custom chain ID', 'error');
                    return;
                }
            }

            if (!contractAddress.match(/^0x[a-fA-F0-9]{40}$/)) {
                showStatus('❌ Invalid contract address format', 'error');
                return;
            }

            hideStatus();
            downloadContract(chainId, contractAddress, apiKey);
        });
    </script>
</body>
</html>