Add specific error message for failed address checksum.

1 files changed, 7 insertions, 0 deletions

diff --git a/ui/app/util.js b/ui/app/util.js
index 1368ebf11..860a17224 100644
--- a/ui/app/util.js
+++ b/ui/app/util.js
@@ -37,6 +37,7 @@ module.exports = {
   bnTable: bnTable,
   isHex: isHex,
   exportAsFile: exportAsFile,
+  isInvalidChecksumAddress,
 }
 
 function valuesFor (obj) {
@@ -66,6 +67,12 @@ function isValidAddress (address) {
   return (isAllOneCase(prefixed) && ethUtil.isValidAddress(prefixed)) || ethUtil.isValidChecksumAddress(prefixed)
 }
 
+function isInvalidChecksumAddress (address) {
+  var prefixed = ethUtil.addHexPrefix(address)
+  if (address === '0x0000000000000000000000000000000000000000') return false
+  return ethUtil.isValidAddress(prefixed) && !ethUtil.isValidChecksumAddress(prefixed)
+}
+
 function isAllOneCase (address) {
   if (!address) return true
   var lower = address.toLowerCase()