4m-wallet-adapter/services/solana/solana-token-service.js

Solana / Near wallet adapter

const { PublicKey } = require('@solana/web3.js');
const {
  Token,
  TOKEN_PROGRAM_ID,
  getOrCreateAssociatedTokenAccount,
  getAssociatedTokenAddress,
} = require('@solana/spl-token');
const SPL_ASSOCIATED_TOKEN_ACCOUNT_PROGRAM_ID = new PublicKey(
  'ATokenGPvbdGVxr1b2hvZbsiqW5xWH25efTNsLJA8knL'
);

const getTokenAccount = async (connection, destination, tokenAddress) => {
  const assocTokenAddress = await getAssociatedTokenAddress(
    new PublicKey(tokenAddress),
    destination
  );
  return await connection.getAccountInfo(assocTokenAddress);
};

const getOrCreateTokenAccount = async (connection, fromKeyPair, token, toPublicKey) => {
  return await getOrCreateAssociatedTokenAccount(
    connection,
    fromKeyPair,
    new PublicKey(token),
    toPublicKey
  );
};

const applyDecimals = (amount, decimals) => {
  return Math.round(parseFloat(amount) * 10 ** decimals);
};

const applyOutDecimals = (amount, decimals) => {
  return parseFloat(amount) / 10 ** decimals;
};

module.exports = {
  getTokenAccount,
  getOrCreateTokenAccount,
  getAssociatedTokenAddress,
  applyDecimals,
  applyOutDecimals,
};