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import ethUtil from 'ethereumjs-util'
import MethodRegistry from 'eth-method-registry'
import abi from 'human-standard-token-abi'
import abiDecoder from 'abi-decoder'
import {
TOKEN_METHOD_TRANSFER,
TOKEN_METHOD_APPROVE,
TOKEN_METHOD_TRANSFER_FROM,
SEND_ETHER_ACTION_KEY,
DEPLOY_CONTRACT_ACTION_KEY,
APPROVE_ACTION_KEY,
SEND_TOKEN_ACTION_KEY,
TRANSFER_FROM_ACTION_KEY,
SIGNATURE_REQUEST_KEY,
UNKNOWN_FUNCTION_KEY,
} from '../constants/transactions'
abiDecoder.addABI(abi)
export function getTokenData (data = {}) {
return abiDecoder.decodeMethod(data)
}
const registry = new MethodRegistry({ provider: global.ethereumProvider })
export async function getMethodData (data = {}) {
const prefixedData = ethUtil.addHexPrefix(data)
const fourBytePrefix = prefixedData.slice(0, 10)
const sig = await registry.lookup(fourBytePrefix)
const parsedResult = registry.parse(sig)
return {
name: parsedResult.name,
params: parsedResult.args,
}
}
export function isConfirmDeployContract (txData = {}) {
const { txParams = {} } = txData
return !txParams.to
}
export async function getTransactionActionKey (transaction, methodData) {
const { txParams: { data, to } = {}, msgParams } = transaction
if (msgParams) {
return SIGNATURE_REQUEST_KEY
}
if (isConfirmDeployContract(transaction)) {
return DEPLOY_CONTRACT_ACTION_KEY
}
if (data) {
const toSmartContract = await isSmartContractAddress(to)
if (!toSmartContract) {
return SEND_ETHER_ACTION_KEY
}
const { name } = methodData
const methodName = name && name.toLowerCase()
if (!methodName) {
return UNKNOWN_FUNCTION_KEY
}
switch (methodName) {
case TOKEN_METHOD_TRANSFER:
return SEND_TOKEN_ACTION_KEY
case TOKEN_METHOD_APPROVE:
return APPROVE_ACTION_KEY
case TOKEN_METHOD_TRANSFER_FROM:
return TRANSFER_FROM_ACTION_KEY
default:
return name
}
} else {
return SEND_ETHER_ACTION_KEY
}
}
export function getLatestSubmittedTxWithNonce (transactions = [], nonce = '0x0') {
if (!transactions.length) {
return {}
}
return transactions.reduce((acc, current) => {
const { submittedTime, txParams: { nonce: currentNonce } = {} } = current
if (currentNonce === nonce) {
return acc.submittedTime
? submittedTime > acc.submittedTime ? current : acc
: current
} else {
return acc
}
}, {})
}
export async function isSmartContractAddress (address) {
const code = await global.eth.getCode(address)
return code && code !== '0x'
}
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