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| 1 | +const provider = window.ethereum; |
| 2 | +const supportedNetworks = { |
| 3 | + westendAssetHub: { |
| 4 | + name: 'Asset-Hub Westend Testnet', |
| 5 | + chainId: '0x190F1B45', //Hex value of "420420421" |
| 6 | + chainName: 'Asset-Hub Westend Testnet', |
| 7 | + rpcUrls: ['https://westend-asset-hub-eth-rpc.polkadot.io'], |
| 8 | + blockExplorerUrls: ['https://westend-asset-hub-eth-explorer.parity.io'], |
| 9 | + nativeCurrency: { |
| 10 | + name: 'Westend Token', |
| 11 | + symbol: 'WND', |
| 12 | + decimals: 18, |
| 13 | + }, |
| 14 | + }, |
| 15 | +}; |
| 16 | + |
| 17 | +/* |
| 18 | + Add or switch to the specified network, then request accounts |
| 19 | + NOTE: This calls "eth_requestAccounts" at the end, which prompts for wallet connection |
| 20 | + */ |
| 21 | +const connectNetwork = async (network) => { |
| 22 | + try { |
| 23 | + const targetNetwork = { ...supportedNetworks[network] }; |
| 24 | + delete targetNetwork.name; // remove 'name' property if needed |
| 25 | + |
| 26 | + await provider.request({ |
| 27 | + method: 'wallet_addEthereumChain', |
| 28 | + params: [targetNetwork], |
| 29 | + }); |
| 30 | + // This line requests user accounts, which triggers a "connect" prompt if not already connected: |
| 31 | + await provider.request({ method: 'eth_requestAccounts' }); |
| 32 | + } catch (e) { |
| 33 | + // 4001: user rejected, -32002: request already pending |
| 34 | + if (e.code !== 4001 && e.code !== -32002) { |
| 35 | + handleError(e.message); |
| 36 | + } |
| 37 | + } |
| 38 | +}; |
| 39 | + |
| 40 | +// Get the network that the user is currently connected to |
| 41 | +const getConnectedNetwork = async () => { |
| 42 | + const chainId = await provider.request({ method: 'eth_chainId' }); |
| 43 | + const connectedHubNetwork = Object.values(supportedNetworks).find( |
| 44 | + (network) => network.chainId === chainId |
| 45 | + ); |
| 46 | + if (connectedNetwork) { |
| 47 | + const connectedNetworkButton = document.querySelector( |
| 48 | + `.connect-network[data-value="${connectedNetwork.name}"]` |
| 49 | + ); |
| 50 | + return { connectedNetwork, connectedNetworkButton }; |
| 51 | + } else { |
| 52 | + return { |
| 53 | + connectedNetwork: null, |
| 54 | + connectedNetworkButton: null, |
| 55 | + }; |
| 56 | + } |
| 57 | +}; |
| 58 | + |
| 59 | +/* Updates the button to show the connected network. */ |
| 60 | +const displayConnectedAccount = async (connectedNetwork, networkButton) => { |
| 61 | + const accounts = await provider.request({ method: 'eth_requestAccounts' }); |
| 62 | + if (!accounts || accounts.length === 0) return; |
| 63 | + |
| 64 | + const shortenedAccount = `${accounts[0].slice(0, 6)}...${accounts[0].slice( |
| 65 | + -4 |
| 66 | + )}`; |
| 67 | + networkButton.innerHTML = `Connected to ${connectedNetwork.chainName}: ${shortenedAccount}`; |
| 68 | + networkButton.className += ' disabled-button'; |
| 69 | +}; |
| 70 | + |
| 71 | +// Displays an error message to the user |
| 72 | +const handleError = (message) => { |
| 73 | + const errorModalContainer = document.querySelector('.error-modal-container'); |
| 74 | + const errorMessage = document.querySelector('.error-message'); |
| 75 | + errorModalContainer.style.display = 'block'; |
| 76 | + errorMessage.innerHTML = message; |
| 77 | +}; |
| 78 | + |
| 79 | +/* |
| 80 | + Handles the logic for the buttons inside of content pages. |
| 81 | + Directly connect to the network specified in 'value' |
| 82 | + */ |
| 83 | +const connectMetaMaskBodyButtons = |
| 84 | + document.querySelectorAll('.connectMetaMask'); |
| 85 | +connectMetaMaskBodyButtons.forEach((btn) => { |
| 86 | + btn.addEventListener('click', async (e) => { |
| 87 | + e.preventDefault(); |
| 88 | + |
| 89 | + if (!provider) { |
| 90 | + handleError( |
| 91 | + `No EVM-compatible wallet found. Please install MetaMask.` |
| 92 | + ); |
| 93 | + return; |
| 94 | + } |
| 95 | + |
| 96 | + const network = btn.getAttribute('value'); |
| 97 | + if (!network || !supportedNetworks[network]) { |
| 98 | + handleError(`The network "${network}" is not supported or not defined.`); |
| 99 | + return; |
| 100 | + } |
| 101 | + |
| 102 | + await connectNetwork(network); |
| 103 | + //Update the button to reflect the "connected" state |
| 104 | + btn.textContent = 'Connected to ' + supportedNetworks[network]['name']; |
| 105 | + btn.classList.add('disabled-button'); |
| 106 | + }); |
| 107 | +}); |
| 108 | + |
| 109 | +if (provider) { |
| 110 | + provider.on('chainChanged', () => { |
| 111 | + window.location.reload(); |
| 112 | + }); |
| 113 | + provider.on('accountsChanged', async (accounts) => { |
| 114 | + if (accounts.length > 0) { |
| 115 | + const { connectedNetwork, connectedNetworkButton } = |
| 116 | + await getConnectedNetwork(); |
| 117 | + if (connectedNetwork) { |
| 118 | + await displayConnectedAccount( |
| 119 | + connectedNetwork, |
| 120 | + connectedNetworkButton |
| 121 | + ); |
| 122 | + } |
| 123 | + } else { |
| 124 | + window.location.reload(); |
| 125 | + } |
| 126 | + }); |
| 127 | +} |
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