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105 lines
2.6 KiB
105 lines
2.6 KiB
const {
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addHexPrefix,
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isValidAddress,
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} = require('ethereumjs-util')
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/**
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@module
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*/
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module.exports = {
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normalizeTxParams,
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validateTxParams,
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validateFrom,
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validateRecipient,
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getFinalStates,
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}
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// functions that handle normalizing of that key in txParams
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const normalizers = {
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from: (from, LowerCase = true) => LowerCase ? addHexPrefix(from).toLowerCase() : addHexPrefix(from),
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to: (to, LowerCase = true) => LowerCase ? addHexPrefix(to).toLowerCase() : addHexPrefix(to),
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nonce: nonce => addHexPrefix(nonce),
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value: value => addHexPrefix(value),
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data: data => addHexPrefix(data),
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gas: gas => addHexPrefix(gas),
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gasPrice: gasPrice => addHexPrefix(gasPrice),
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}
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/**
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normalizes txParams
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@param txParams {object}
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@returns {object} normalized txParams
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*/
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function normalizeTxParams (txParams, LowerCase) {
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// apply only keys in the normalizers
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const normalizedTxParams = {}
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for (const key in normalizers) {
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if (txParams[key]) {
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normalizedTxParams[key] = normalizers[key](txParams[key], LowerCase)
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}
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}
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return normalizedTxParams
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}
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/**
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validates txParams
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@param txParams {object}
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*/
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function validateTxParams (txParams) {
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validateFrom(txParams)
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validateRecipient(txParams)
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if ('value' in txParams) {
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const value = txParams.value.toString()
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if (value.includes('-')) {
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throw new Error(`Invalid transaction value of ${txParams.value} not a positive number.`)
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}
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if (value.includes('.')) {
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throw new Error(`Invalid transaction value of ${txParams.value} number must be in wei`)
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}
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}
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}
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/**
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validates the from field in txParams
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@param txParams {object}
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*/
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function validateFrom (txParams) {
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if (!(typeof txParams.from === 'string')) {
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throw new Error(`Invalid from address ${txParams.from} not a string`)
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}
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if (!isValidAddress(txParams.from)) {
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throw new Error('Invalid from address')
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}
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}
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/**
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validates the to field in txParams
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@param txParams {object}
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*/
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function validateRecipient (txParams) {
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if (txParams.to === '0x' || txParams.to === null) {
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if (txParams.data) {
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delete txParams.to
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} else {
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throw new Error('Invalid recipient address')
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}
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} else if (txParams.to !== undefined && !isValidAddress(txParams.to)) {
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throw new Error('Invalid recipient address')
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}
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return txParams
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}
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/**
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@returns an {array} of states that can be considered final
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*/
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function getFinalStates () {
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return [
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'rejected', // the user has responded no!
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'confirmed', // the tx has been included in a block.
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'failed', // the tx failed for some reason, included on tx data.
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'dropped', // the tx nonce was already used
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]
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}
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