Hedera Wallet Snap connects to your currently connected Metamask account by default. To learn how apps can connect to Hedera Wallet Snap using a non-metamask(external) account, refer to this documentation.
Then, depending on whether you're trying to connect to a metamask account or a non-metamask account, you can call the snap API in the following way:
const snapId = `npm:@hashgraph/hedera-wallet-snap`
type SmartContractFunctionParameter = {
type: 'string' | 'bytes' | 'boolean' | 'int' | 'uint';
value: string | number | boolean | Uint8Array;
}
const createTokenAPI = async () => {
const externalAccountParams = {
externalAccount: {
accountIdOrEvmAddress: '0.0.12345',
curve: 'ED25519'
}
}
await window.ethereum.request({
method: 'wallet_invokeSnap',
params: {
snapId,
request: {
method: 'hscs/createSmartContract',
params: {
network: 'testnet',
gas: 100000,
bytecode: "6080604052...0008190033",
initialBalance?, // Optional param - type: number
adminKey?, // Optional param - type: string
constructorParameters?: // Optional param - type: SmartContractFunctionParameter[]
contractMemo?, // Optional param - type: string
stakedNodeId?, // Optional param - type: number
stakedAccountId?, // Optional param - type: string
declineStakingReward?, // Optional param - type: boolean
autoRenewPeriod?, // Optional param - type: number
maxAutomaticTokenAssociations?, // Optional param - type: number
/*
Uncomment the below line if you want to connect
to a non-metamask account
*/
// ...externalAccountParams
}
}
}
})
}Retrieves the currently connected account the user has selected on Metamask. If it's the first time, a new snap account is created and the account info is saved in snap state.
Parses the arguments that were passed such as the gas, bytecode, adminKey, etc.
Calls the Hedera SDK Create Smart Contract API to create a new smart contract instance. This API uses ContractCreateFlow() API to create the file storing the bytecode and contract in a single step so you do not need to do anything other than compile your Solidity code and pass the bytecode to the API. The constructor will be executed using the given amount of gas, and any unspent gas will be refunded to the paying account.
Returns the transaction receipt as response
An example response:
{
"currentAccount": {
"metamaskEvmAddress": "0x0b3628d1b838993b5fceec8b2a26502e7a8e5241",
"externalEvmAddress": "",
"hederaAccountId": "0.0.3581604",
"hederaEvmAddress": "0xca53f9c93d30e0b7212d67901e5a24fb090d542b",
"publicKey": "0x0206022cea4c6dd6d2e7263b8802253971de922f5380661d97cba82dee66f57ad6",
"balance": {
"hbars": 104.67332072,
"timestamp": "Thu, 25 Apr 2024 17:54:55 GMT",
"tokens": {}
},
"network": "testnet",
"mirrorNodeUrl": "https://testnet.mirrornode.hedera.com"
},
"receipt": {
"status": "SUCCESS",
"accountId": "",
"fileId": "",
"contractId": "0.0.4409710",
"topicId": "",
"tokenId": "",
"scheduleId": "",
"exchangeRate": {
"hbars": 30000,
"cents": 358240,
"expirationTime": "Thu, 25 Apr 2024 19:00:00 GMT",
"exchangeRateInCents": 11.941333333333333
},
"topicSequenceNumber": "0",
"topicRunningHash": "",
"totalSupply": "0",
"scheduledTransactionId": "",
"serials": [],
"duplicates": [],
"children": []
}
}