metamask-extension/app/scripts/migrations/024.js

/*

This migration ensures that the from address in txParams is to lower case for
all unapproved transactions

*/

import { cloneDeep } from 'lodash'

const version = 24

export default {
  version,

  async migrate(originalVersionedData) {
    const versionedData = cloneDeep(originalVersionedData)
    versionedData.meta.version = version
    const state = versionedData.data
    const newState = transformState(state)
    versionedData.data = newState
    return versionedData
  },
}

function transformState(state) {
  const newState = state
  if (!newState.TransactionController) {
    return newState
  }
  const { transactions } = newState.TransactionController
  newState.TransactionController.transactions = transactions.map(
    (txMeta, _) => {
      if (
        txMeta.status === 'unapproved' &&
        txMeta.txParams &&
        txMeta.txParams.from
      ) {
        txMeta.txParams.from = txMeta.txParams.from.toLowerCase()
      }
      return txMeta
    },
  )
  return newState
}