WA-232 Created localStorage tokens utility class

src/utils/localStorage/index.js

@@ -5,6 +5,7 @@ import { type Owner } from '~/routes/safe/store/model/owner'
 export const SAFES_KEY = 'SAFES'
 export const TX_KEY = 'TX'
 export const OWNERS_KEY = 'OWNERS'
+export const TOKENS_KEY = 'TOKENS'
 
 export const load = (key: string) => {
   try {

src/utils/localStorage/tokens.js

@@ -0,0 +1,28 @@
+// @flow
+import { List } from 'immutable'
+import { load, TOKENS_KEY } from '~/utils/localStorage'
+
+const getTokensKey = (safeAddress: string) => `${TOKENS_KEY}-${safeAddress}`
+
+export const setTokens = (safeAddress: string, tokens: List<string>) => {
+  try {
+    const serializedState = JSON.stringify(tokens)
+    const key = getTokensKey(safeAddress)
+    localStorage.setItem(key, serializedState)
+  } catch (err) {
+    // eslint-disable-next-line
+    console.log('Error storing tokens in localstorage')
+  }
+}
+
+export const getTokens = (safeAddress: string): List<string> => {
+  const key = getTokensKey(safeAddress)
+  const data = load(key)
+
+  return data ? List(data) : List()
+}
+
+export const storedTokensBefore = (safeAddress: string) => {
+  const key = getTokensKey(safeAddress)
+  return localStorage.getItem(key) === null
+}