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HIP-583 - TransferUsingEvmAddressExample
Signed-off-by: Nikola Genov <[email protected]>
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Nikola Genov
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examples/src/main/java/TransferUsingEvmAddressExample.java
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| import com.hedera.hashgraph.sdk.*; | ||
| import io.github.cdimascio.dotenv.Dotenv; | ||
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| import java.io.IOException; | ||
| import java.util.Objects; | ||
| import java.util.concurrent.TimeoutException; | ||
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| public class TransferUsingEvmAddressExample { | ||
| // see `.env.sample` in the repository root for how to specify these values | ||
| // or set environment variables with the same names | ||
| private static final AccountId OPERATOR_ID = AccountId.fromString(Objects.requireNonNull(Dotenv.load().get("OPERATOR_ID"))); | ||
| private static final PrivateKey OPERATOR_KEY = PrivateKey.fromString(Objects.requireNonNull(Dotenv.load().get("OPERATOR_KEY"))); | ||
| // HEDERA_NETWORK defaults to testnet if not specified in dotenv | ||
| private static final String HEDERA_NETWORK = Dotenv.load().get("HEDERA_NETWORK", "testnet"); | ||
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| private TransferUsingEvmAddressExample() { | ||
| } | ||
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| /* | ||
| Transfer HBAR or tokens to a Hedera account using their public-address. | ||
| Reference: [HIP-583 Expand alias support in CryptoCreate & CryptoTransfer Transactions](https://hips.hedera.com/hip/hip-583) | ||
| ## Example 1 | ||
| - Create an ECSDA private key | ||
| - Extract the ECDSA public key | ||
| - Extract the Ethereum public address | ||
| - Add function to calculate the Ethereum Address to example in SDK | ||
| - Ethereum account address / public-address - This is the rightmost 20 bytes of the 32 byte Keccak-256 hash of the ECDSA public key of the account. This calculation is in the manner described by the Ethereum Yellow Paper. | ||
| - Transfer tokens using the `TransferTransaction` to the Etherum Account Address | ||
| - The From field should be a complete account that has a public address | ||
| - The To field should be to a public address (to create a new account) | ||
| - Get the child receipt or child record to return the Hedera Account ID for the new account that was created | ||
| - Get the `AccountInfo` on the new account and show it is a hollow account by not having a public key | ||
| - This is a hollow account in this state | ||
| - Use the hollow account as a transaction fee payer in a HAPI transaction | ||
| - Sign the transaction with ECDSA private key | ||
| - Get the `AccountInfo` of the account and show the account is now a complete account by returning the public key on the account | ||
| */ | ||
| public static void main(String[] args) throws PrecheckStatusException, TimeoutException, ReceiptStatusException, InterruptedException, IOException { | ||
| Client client = Client.forName(HEDERA_NETWORK); | ||
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| // Defaults the operator account ID and key such that all generated transactions will be paid for by this account and be signed by this key | ||
| client.setOperator(OPERATOR_ID, OPERATOR_KEY); | ||
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| /* | ||
| * Step 1 | ||
| * Create an ECSDA private key | ||
| */ | ||
| PrivateKey privateKey = PrivateKey.generateECDSA(); | ||
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| /* | ||
| * Step 2 | ||
| * Extract the ECDSA public key | ||
| */ | ||
| PublicKey publicKey = privateKey.getPublicKey(); | ||
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| /* | ||
| * Step 3 | ||
| * Extract the Ethereum public address | ||
| */ | ||
| EvmAddress evmAddress = publicKey.toEvmAddress(); | ||
| System.out.println("Corresponding evm address: " + evmAddress); | ||
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| /* | ||
| * Step 4 | ||
| * Transfer tokens using the `TransferTransaction` to the Etherum Account Address | ||
| * - The From field should be a complete account that has a public address | ||
| * - The To field should be to a public address (to create a new account) | ||
| */ | ||
| TransferTransaction transferTx = new TransferTransaction() | ||
| .addHbarTransfer(OPERATOR_ID, Hbar.from(10).negated()) | ||
| .addHbarTransfer(evmAddress, Hbar.from(10)) | ||
| .freezeWith(client); | ||
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| TransferTransaction transferTxSign = transferTx.sign(OPERATOR_KEY); | ||
| TransactionResponse transferTxSubmit = transferTxSign.execute(client); | ||
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| /* | ||
| * Step 5 | ||
| * Get the child receipt or child record to return the Hedera Account ID for the new account that was created | ||
| */ | ||
| TransactionReceipt receipt = new TransactionReceiptQuery() | ||
| .setTransactionId(transferTxSubmit.transactionId) | ||
| .setIncludeChildren(true) | ||
| .execute(client); | ||
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| AccountId newAccountId = receipt.children.get(0).accountId; | ||
| System.out.println(newAccountId); | ||
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| /* | ||
| * Step 6 | ||
| * Get the `AccountInfo` on the new account and show it is a hollow account by not having a public key | ||
| */ | ||
| AccountInfo accountInfo = new AccountInfoQuery() | ||
| .setAccountId(newAccountId) | ||
| .execute(client); | ||
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| System.out.println("accountInfo: " + accountInfo); | ||
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| /* | ||
| * Step 7 | ||
| * Use the hollow account as a transaction fee payer in a HAPI transaction | ||
| */ | ||
| client.setOperator(newAccountId, privateKey); | ||
| PublicKey newPublicKey = PrivateKey.generateED25519().getPublicKey(); | ||
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| AccountCreateTransaction transaction = new AccountCreateTransaction() | ||
| .setKey(newPublicKey) | ||
| .freezeWith(client); | ||
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| /* | ||
| * Step 8 | ||
| * Sign the transaction with ECDSA private key | ||
| */ | ||
| AccountCreateTransaction transactionSign = transaction.sign(privateKey); | ||
| TransactionResponse transactionSubmit = transactionSign.execute(client); | ||
| TransactionReceipt status = transactionSubmit.getReceipt(client); | ||
| System.out.println(status); | ||
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| /* | ||
| * Step 9 | ||
| * Get the `AccountInfo` of the account and show the account is now a complete account by returning the public key on the account | ||
| */ | ||
| AccountInfo accountInfo2 = new AccountInfoQuery() | ||
| .setAccountId(newAccountId) | ||
| .execute(client); | ||
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| System.out.println("The public key of the newly created and now complete account: " + accountInfo2.key); | ||
| } | ||
| } |