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Add wallet_addEthereumChain fallback for unknown chains #4

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Add wallet_addEthereumChain fallback for unknown chains #4

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72 changes: 66 additions & 6 deletions static/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -265,18 +265,39 @@ <h2>Check Payment Status</h2>
`Please switch to ${network} (Chain ID: ${expectedChainId}). Current: ${currentNetwork.chainId}`
);

const chainIdHex = '0x' + expectedChainId.toString(16);

try {
await window.ethereum.request({
method: 'wallet_switchEthereumChain',
params: [{ chainId: '0x' + expectedChainId.toString(16) }],
params: [{ chainId: chainIdHex }],
});
// Reconnect after switch
provider = new ethers.BrowserProvider(window.ethereum);
signer = await provider.getSigner();
} catch (switchError) {
showResult('pay-result', 'error', `Failed to switch network: ${switchError.message}`);
return;
// Error code 4902 means chain not added to MetaMask
if (switchError.code === 4902) {
try {
const chainConfig = getChainConfig(expectedChainId);
if (!chainConfig) {
showResult('pay-result', 'error', `Unknown chain ID: ${expectedChainId}`);
return;
}
await window.ethereum.request({
method: 'wallet_addEthereumChain',
params: [chainConfig],
});
} catch (addError) {
showResult('pay-result', 'error', `Failed to add network: ${addError.message}`);
return;
}
} else {
showResult('pay-result', 'error', `Failed to switch network: ${switchError.message}`);
return;
}
}

// Reconnect after switch
provider = new ethers.BrowserProvider(window.ethereum);
signer = await provider.getSigner();
}

showResult('pay-result', 'info', 'Preparing payment signature...');
Expand Down Expand Up @@ -446,6 +467,45 @@ <h2>Check Payment Status</h2>
element.classList.remove('hidden');
}

// Chain configurations for wallet_addEthereumChain
function getChainConfig(chainId) {
const chains = {
// Base Mainnet
8453: {
chainId: '0x2105',
chainName: 'Base',
nativeCurrency: { name: 'Ether', symbol: 'ETH', decimals: 18 },
rpcUrls: ['https://mainnet.base.org'],
blockExplorerUrls: ['https://basescan.org']
},
// Base Sepolia
84532: {
chainId: '0x14a34',
chainName: 'Base Sepolia',
nativeCurrency: { name: 'Ether', symbol: 'ETH', decimals: 18 },
rpcUrls: ['https://sepolia.base.org'],
blockExplorerUrls: ['https://sepolia.basescan.org']
},
// Ethereum Mainnet
1: {
chainId: '0x1',
chainName: 'Ethereum',
nativeCurrency: { name: 'Ether', symbol: 'ETH', decimals: 18 },
rpcUrls: ['https://eth.llamarpc.com'],
blockExplorerUrls: ['https://etherscan.io']
},
// Ethereum Sepolia
11155111: {
chainId: '0xaa36a7',
chainName: 'Sepolia',
nativeCurrency: { name: 'Ether', symbol: 'ETH', decimals: 18 },
rpcUrls: ['https://rpc.sepolia.org'],
blockExplorerUrls: ['https://sepolia.etherscan.io']
}
};
return chains[chainId] || null;
}

// Helper function to normalize payment input to full URL
function getPaymentUrl(input, type = 'pay') {
if (!input) return null;
Expand Down