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import ethUtil from 'ethereumjs-util'
import MethodRegistry from 'eth-method-registry'
const registry = new MethodRegistry({ provider: global.ethereumProvider })
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,
} from '../constants/transactions'
export function isConfirmDeployContract (txData = {}) {
const { txParams = {} } = txData
return !txParams.to
}
export function getTransactionActionKey (transaction, methodData) {
const { txParams: { data } = {} } = transaction
if (isConfirmDeployContract(transaction)) {
return DEPLOY_CONTRACT_ACTION_KEY
}
if (data) {
const { name } = methodData
const methodName = name && name.toLowerCase()
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 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,
}
}
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