Management of Metamask Popup Trigger: a guide to identify the types of transaction
As applications for the construction of developers who interact with decentralized finance protocols (Defi), you are probably not foreign to the concept of Metamask, the popular extension of the Ethereum browser that allows users to safely manage their digital wallets. However, when they interact with Defi services such as loan or Stablecoin exchange platforms, it is possible to meet popup windows activated by the Metamask extension. In this article, we will deepen how to manage these Trigger Popup and identify the type of transaction that is attempted.
Understanding of the types of transaction
Before immersing yourself in the solution, it is essential to understand the different types of transactions that can trigger metamask popups:
- Transfer : A transfer is a basic transaction in which activities move from one portfolio to another.
2
- Call : A call is a transaction that invokes a function on the blockchain Ethereum, which can be used to perform various actions such as the recording of transactions, updating information on the balance or activation of other contracts.
- Send : An sending is similar to a transfer, but it is an outgoing transaction in which the activities are sent from one portfolio to another.
FRGGGERS POPUP METAMASK
When the extension of Metamask triggers a popup window, you will have to identify the type of transaction that you try to prevent any security vulnerabilities or data violations. Here are some steps you can do to manage these Trigger Popup:
- Check the details of the transaction: before activating an action, inspect the details of the transaction provided by Metamask. This will help you determine which type of transaction is attempted.
- Use the Field
ContrattattAddress'
: the field calls in the transaction payload it contains information on the contract or the intelligent contract that is invoked. If it corresponds to a well -known contractual address, you can proceed with your action.
- Check the fieldTXHASH ‘: the field’ TXHASH ‘also provides valuable information on the transaction, including its hash and its tariff. You can use it to check if the transaction is a valid attempt or not.
- Use a transactions control : consider implementing transactions control using bookstores such as web3.js or ehers.js. These bookstores provide pre-built functions to verify some types of transaction (e.g. transfer, approval, call) and notify you when they are detected.
Example code
To demonstrate the concept of managing Metamask’s Trigger Popup, we use an example code in JavaScript:
`Javascript
Const Web3 = Requirements (‘Web3’);
Const Web3 = New Web3 (New Window.ethernetProsider (‘
Async HandlePopup function (transaction) {
Const contracttress = transaction.ContractAddress;
IF (ContrattattAddress && (Transaction.type === ‘Transfer’ || Transaction.type === ‘approval’)) {
Console.log (`transaction is $ {transaction.type} for $ address {contractedudress});
} Else If (Transaction.type === ‘Call’) {
Console.log (`transaction is a call for contract $ {ContrattattAddress});
} other {
console.error (“type of unknown transaction”);
}
}
Const MyConttract = New Web3.eth.Contract (‘0x … Your_Contract_Address …’, ‘Your_Contract_name’);
// simulates a trigger popup
Const Transaction = {
from: ‘0x … my accounts,
A: “0x … Other Accounts”,
ContractAddress: “0x … Contract address”,
Type: “transfer”,
};
handlebar (transaction);
`
In this example, we are creating an application for the contract and simulating a trigger popup for a` transfer ‘transaction.