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const {
addHexPrefix,
isValidAddress,
} = require('ethereumjs-util')
module.exports = {
normalizeTxParams,
validateTxParams,
validateFrom,
validateRecipient,
}
function normalizeTxParams (txParams) {
// functions that handle normalizing of that key in txParams
const whiteList = {
from: from => addHexPrefix(from).toLowerCase(),
to: to => addHexPrefix(txParams.to).toLowerCase(),
nonce: nonce => addHexPrefix(nonce),
value: value => addHexPrefix(value),
data: data => addHexPrefix(data),
gas: gas => addHexPrefix(gas),
gasPrice: gasPrice => addHexPrefix(gasPrice),
}
// apply only keys in the whiteList
const normalizedTxParams = {}
Object.keys(whiteList).forEach((key) => {
if (txParams[key]) normalizedTxParams[key] = whiteList[key](txParams[key])
})
return normalizedTxParams
}
function validateTxParams (txParams) {
validateFrom(txParams)
validateRecipient(txParams)
if ('value' in txParams) {
const value = txParams.value.toString()
if (value.includes('-')) {
throw new Error(`Invalid transaction value of ${txParams.value} not a positive number.`)
}
if (value.includes('.')) {
throw new Error(`Invalid transaction value of ${txParams.value} number must be in wei`)
}
}
}
function validateFrom (txParams) {
if (!(typeof txParams.from === 'string')) throw new Error(`Invalid from address ${txParams.from} not a string`)
if (!isValidAddress(txParams.from)) throw new Error('Invalid from address')
}
function validateRecipient (txParams) {
if (txParams.to === '0x' || txParams.to === null) {
if (txParams.data) {
delete txParams.to
} else {
throw new Error('Invalid recipient address')
}
} else if (txParams.to !== undefined && !isValidAddress(txParams.to)) {
throw new Error('Invalid recipient address')
}
return txParams
}
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