Disable Seedphrase import button if any of the characters is in uppercase (#15186)

app/_locales/en/messages.json

@@ -1638,6 +1638,9 @@
   "invalidSeedPhrase": {
     "message": "Invalid Secret Recovery Phrase"
   },
+  "invalidSeedPhraseCaseSensitive": {
+    "message": "Invalid input! Secret Recovery Phrase is case sensitive."
+  },
   "ipfsGateway": {
     "message": "IPFS Gateway"
   },

ui/components/app/srp-input/srp-input.js

@@ -19,6 +19,10 @@ const { isValidMnemonic } = ethers.utils;
 
 const defaultNumberOfWords = 12;
 
+const hasUpperCase = (draftSrp) => {
+  return draftSrp !== draftSrp.toLowerCase();
+};
+
 export default function SrpInput({ onChange, srpText }) {
   const [srpError, setSrpError] = useState('');
   const [pasteFailed, setPasteFailed] = useState(false);
@@ -40,6 +44,8 @@ export default function SrpInput({ onChange, srpText }) {
       if (newDraftSrp.some((word) => word !== '')) {
         if (newDraftSrp.some((word) => word === '')) {
           newSrpError = t('seedPhraseReq');
+        } else if (hasUpperCase(joinedDraftSrp)) {
+          newSrpError = t('invalidSeedPhraseCaseSensitive');
         } else if (!isValidMnemonic(joinedDraftSrp)) {
           newSrpError = t('invalidSeedPhrase');
         }