sdk/packages/harmony-account

1. About This Package
2. Usage of Account
   1. Dependencies
   2. Examples
      1. Create a random account
      2. Import an existing privateKey to create Account
      3. Encrypt/Export keyStore file, Decrypt/Import keyStore file
      4. Address format getter
      5. Sign a transaction
3. Usage of Wallet
   1. Dependencies

About This Package

@harmony-js/account is dealing with account related features.

Developers can use this packages to:

• create Account instance
• create Wallet instance
• sign Transaction
• convert address format
• manage privateKey or mnemonic phrases and do the encrypt and decrypt job

There are 2 main classes in this package, Account and Wallet.

The Account class is basic instance that contains most features mentioned above. The Wallet class is class that stores all Account instance, you can do CRUD on it.

Usage of Account

Dependencies

• "@harmony-js/network",
• "@harmony-js/staking",
• "@harmony-js/transaction",
• "@harmony-js/utils"

Examples

Create a random account

    // import the Account class
    import {Account} from '@harmony-js/account'

    // Messenger is optional, by default, we have a defaultMessenger 
    // If you like to change, you will import related package here.
    import { HttpProvider, Messenger } from '@harmony-js/network';
    import { ChainType, ChainID } from '@harmony-js/utils';

    // create a custom messenger
    const customMessenger = new Messenger(
        new HttpProvider('http://localhost:9500'),
        ChainType.Harmony, // if you are connected to Harmony's blockchain
        ChainID.HmyLocal, // check if the chainId is correct
    )

    // to create an Account with random privateKey
    // and you can setMessenger later
    const randomAccount = new Account()
    randomAccount.setMessenger(customMessenger)

    // or you can set messenger on `new`
    const randomAccountWithCustomMessenger = new Account(undefined, customMessenger)

    // you can display the account
    console.log({randomAccount,randomAccountWithCustomMessenger})

    // or you can use static method to create an Account
    const staticCreatedAccount = Account.new()
    // but you have to set messenger manually after
    staticCreatedAccount.setMessenger(customMessenger)

    console.log({staticCreatedAccount})

Import an existing privateKey to create Account

    // import the Account class
    import {Account} from '@harmony-js/account'

    // NOTED: Key with or without `0x` are accepted, makes no different
    // NOTED: DO NOT import `mnemonic phrase` using `Account` class, use `Wallet` instead
    const myPrivateKey = '0xe19d05c5452598e24caad4a0d85a49146f7be089515c905ae6a19e8a578a6930'

    const myAccountWithMyPrivateKey = new Account(myPrivateKey)

    // you can also import privateKey use static method
    const myAccountWithMyPrivateKeyUsingStatic = Account.add(myPrivateKey)

    console.log({ myAccountWithMyPrivateKey, myAccountWithMyPrivateKeyUsingStatic })

Encrypt/Export keyStore file, Decrypt/Import keyStore file

    // import the Account class
    import {Account} from '@harmony-js/account'
    
    // suppose we have an account
    const myPrivateKey = '0xe19d05c5452598e24caad4a0d85a49146f7be089515c905ae6a19e8a578a6930'
    const myAccountWithMyPrivateKey = new Account(myPrivateKey)

    // suppose we have a password, and we want to encrypt the account above
    const myStrongPassword = '123'

    async function encryptAndDecrypt(password) {
        // we get the privateKey before encrypted as comparison
        const unencryptedPrivateKey = myAccountWithMyPrivateKey.privateKey

        // export the account to keyStore string, which will make the privateKey encrpyted
        const keyStoreFile = await myAccountWithMyPrivateKey.toFile(password)
        // exported keyStoreFile
        console.log({ keyStoreFile })
        // see if the account is encrypted
        console.log(`Is this account encrypted? \n ${myAccountWithMyPrivateKey.encrypted}`)
        // keystore file should be equal to encrypted privateKey
        console.log(
            `Is privateKey equal to keyStore string? \n ${keyStoreFile ===
            myAccountWithMyPrivateKey.privateKey}`,
        )
    }

    encryptAndDecrypt(myStrongPassword)


    // suppose we have keyStorefile, in this example, we just use same password and keystore string encrypted above
    const someKeyStoreFile =
    '{"version":3,"id":"62326332-3139-4839-b534-656134623066","address":"1fe3da351d9fc0c4f02de5412ad7def8aee956c5","Crypto":{"ciphertext":"b86ab81682c9f5a35738ad9bd38cd9b46c1b852ef33f16dd83068f79e20d5531","cipherparams":{"iv":"44efb5a514f34968e92cafad80566487"},"cipher":"aes-128-ctr","kdf":"scrypt","kdfparams":{"salt":"d70ae1f311601562113f98c8ebe382f52a332dca1588886e5ea91e2f8a647134","n":8192,"r":8,"p":1,"dklen":32},"mac":"7b63e4e31a75a22b7091291bb58302655b738539ef3e30b30a7a7f170f6163ef"}}'

    async function importKeyStoreFileAndDecrypt(keyStoreFile, password) {
        // import keyStore string and provide the password, remember to make a new Account first
        const importedAccount = await Account.new().fromFile(keyStoreFile, password)
        // the account should decypted which `Account.encrypted` is false
        console.log(`Is this account encrypted? \n ${importedAccount.encrypted}`)
        // see if the privatekey is equal to unencrypted one?
        console.log(
            `Is the account recovered from keystore? \n ${importedAccount.privateKey === myPrivateKey}`,
        )
    }

    importKeyStoreFileAndDecrypt(someKeyStoreFile, myStrongPassword)
    

Address format getter

    // import the Account class
    import {Account} from '@harmony-js/account'
    
    // suppose we have an account
    const myPrivateKey = '0xe19d05c5452598e24caad4a0d85a49146f7be089515c905ae6a19e8a578a6930'
    const myAccountWithMyPrivateKey = new Account(myPrivateKey)

    // Account.address is bytes20/base16 address
    console.log(myAccountWithMyPrivateKey.address)
    // Account.bech32Address is bech32 format address, in Harmony, it's `one1` prefixed
    console.log(myAccountWithMyPrivateKey.bech32Address)
    // Account.bech32TestNetAddress is bech32 format address, in Harmony, it's `tone1` prefixed, used in testnet
    console.log(myAccountWithMyPrivateKey.bech32TestNetAddress)
    // Account.checksumAddress is checksumed address from base16
    console.log(myAccountWithMyPrivateKey.checksumAddress)

Sign a transaction

    // import the Account class
    import {Account} from '@harmony-js/account'

    // import Transaction class from '@harmony-js/transaction'
    import {Transaction} from '@harmony-js/transaction'
    
     // Messenger is optional, by default, we have a defaultMessenger 
    // If you like to change, you will import related package here.
    import { HttpProvider, Messenger } from '@harmony-js/network';
    import { ChainType, ChainID, Unit } from '@harmony-js/utils';

    // create a custom messenger
    const customMessenger = new Messenger(
        new HttpProvider('http://localhost:9500'),
        ChainType.Harmony, // if you are connected to Harmony's blockchain
        ChainID.HmyLocal, // check if the chainId is correct
    )
    // suppose we have an account
    const myPrivateKey = '0xe19d05c5452598e24caad4a0d85a49146f7be089515c905ae6a19e8a578a6930'
    const myAccountWithMyPrivateKey = new Account(myPrivateKey)

    
    const txnObject = {
        //  token send to
        to: 'one166axnkjmghkf3df7xfvd0hn4dft8kemrza4cd2',
        // amount to send
        value: '1000000000000000000000',
        // gas limit, you can use string or use BN value
        gasLimit: '210000',
        // send token from shardID
        shardID: 0,
        // send token to toShardID
        toShardID: 0,
        // gas Price, you can use Unit class, and use Gwei, then remember to use toWei(), which will be transformed to BN
        gasPrice: new Unit('100').asGwei().toWei(),
        // if you set nonce manually here, and remember, the `updateNonce` of `Account.signTransaction` should be set to false
        nonce: 0,
    };

    const txn = new Transaction(txnObject, customMessenger);

    async function signTheTxn() {
        // Account.signTransaction(transaction: Transaction, updateNonce?: boolean, encodeMode?: string, blockNumber?: string): Promise<Transaction>
        // If the 2nd parameter `updateNonce` is set to true, it will query and update account's nonce before it signs
        const signedTxn = await myAccountWithMyPrivateKey.signTransaction(txn, false, 'rlp', 'latest');

        // see if the transaction is signed
        console.log(`\n see if transaction is signed: \n ${signedTxn.isSigned()} \n`);

        // get the tranaction bytes
        console.log(`\n the signed bytes is: \n ${signedTxn.getRawTransaction()} \n`);

        return signTheTxn;
    }

    signTheTxn();

Usage of Wallet

Dependencies

• "@harmony-js/crypto",
• "@harmony-js/network",
• "@harmony-js/staking",
• "@harmony-js/transaction",
• "@harmony-js/utils"

    import {Wallet} from '@harmony-js/account'

    const wallet=new Wallet()