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metamask-extension/app/scripts/migrations/026.js

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const version = 26
/*
This migration moves the identities stored in the KeyringController
into the PreferencesController
*/
const clone = require('clone')
module.exports = {
version,
migrate (originalVersionedData) {
const versionedData = clone(originalVersionedData)
versionedData.meta.version = version
try {
const state = versionedData.data
versionedData.data = transformState(state)
} catch (err) {
console.warn(`MetaMask Migration #${version}` + err.stack)
return Promise.reject(err)
}
return Promise.resolve(versionedData)
},
}
function transformState (state) {
if (!state.KeyringController || !state.PreferencesController) {
return state
}
if (!state.KeyringController.walletNicknames) {
return state
}
state.PreferencesController.identities = Object.keys(state.KeyringController.walletNicknames)
.reduce((identities, address) => {
identities[address] = {
name: state.KeyringController.walletNicknames[address],
address,
}
return identities
}, {})
delete state.KeyringController.walletNicknames
return state
}