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Get the currently selected account in Metamask
Metamask is a popular cryptocurrency wallet that allows users to store, send, and receive cryptocurrency. When you connect an account to your site using MetaMask’s eth_requestAccounts() method, only the currently selected Ethereum account will be returned. However, if you switch accounts while the first one is still connected to your site, the eth_requestAccounts() method may return an incorrect result.
The Problem
When a user switches accounts in Metamask, the wallet creates a new blockchain session for each connection. As a result, all MetaMask connections are stored on the local computer’s Ethereum node. This means that even if you switch accounts while the first one is still connected, your wallet will only store information for the newly selected account.
Solution
To solve this problem, you can use the eth_requestAccounts() method in a callback function with an additional argument specifying the current blockchain session ID (SSID). The SSID is generated when a new connection is established to the Ethereum network. You can then compare these SSIDs to determine which account is currently selected.
Sample Code
Here is an example of how to get the currently selected account using eth_requestAccounts() with an additional argument for the current SSID:
async function getCurrentlySelectedAccount() {
const [selectedAccount, account] = await MetaMask.eth.request({
method: 'eth_requestAccounts',
params: [],
});
if (account length > 0) {
const sessionId = account[0].ssid;
// Use the SSID to determine which account is currently selected
// Example:
const selectedAccountAddress = accounts.find((account) => account.address === selectedAccount).address;
console.log(Currently selected account: ${selectedAccountAddress});
} else {
console.log('There are no accounts connected.');
}
}
Using the callback function
To use this approach, you can modify the eth_requestAccounts() call to pass an additional argument specifying the current SSID:
async function getCurrentlySelectedAccount() {
const [selectedAccount, account] = await MetaMask.eth.request({
method: 'eth_requestAccounts',
parameters: [
{
ssid: 'your-ssid-here', // replace with your actual SSID
},
],
});
if (account length > 0) {
const sessionId = account[0].ssid;
const selectedAccountAddress = accounts.find((account) => account.address === selectedAccount).address;
console.log(Currently selected account: ${selectedAccountAddress});
} else {
console.log('There are no connected accounts.');
}
}
Conclusion
Using the eth_requestAccounts() method in a callback function with an additional argument for the current SSID, you can determine which account is currently selected when switching connections. This approach ensures accurate information about your Ethereum accounts across all MetaMask connections.
Note: Be sure to replace "your-ssid-here" with your actual SSID value.
