Disallow upper case letters in passphrase

i18n/locales/en/common.json

@@ -192,6 +192,7 @@
   "What's New...": "What's New...",
   "When you have the signature, you only need the publicKey of the signer in order to verify that the message came from the right private/publicKey pair. Be aware, everybody knowing the signature and the publicKey can verify the message. If ever there is a dispute, everybody can take the publicKey and signature to a judge and prove that the message is coming from the specific private/publicKey pair.": "When you have the signature, you only need the publicKey of the signer in order to verify that the message came from the right private/publicKey pair. Be aware, everybody knowing the signature and the publicKey can verify the message. If ever there is a dispute, everybody can take the publicKey and signature to a judge and prove that the message is coming from the specific private/publicKey pair.",
   "Window": "Window",
+  "Word \"{{invalidWord}}\" contains upper case letters. All words must be lower case": "Word \"{{invalidWord}}\" contains upper case letters. All words must be lower case",
   "Word \"{{invalidWord}}\" is not on the passphrase Word List.": "Word \"{{invalidWord}}\" is not on the passphrase Word List.",
   "Word \"{{invalidWord}}\" is not on the passphrase Word List. Most similar word on the list is \"{{similarWord}}\"": "Word \"{{invalidWord}}\" is not on the passphrase Word List. Most similar word on the list is \"{{similarWord}}\"",
   "Yes! It's safe": "Yes! It's safe",

src/components/passphraseInput/index.js

@@ -38,11 +38,13 @@ class PassphraseInput extends React.Component {
       return this.props.t('Passphrase should have 12 words, entered passphrase has {{length}}', { length: mnemonic.length });
     }
 
-    const invalidWord = mnemonic.find(word => !inDictionary(word.toLowerCase()));
+    const invalidWord = mnemonic.find(word => !inDictionary(word));
     if (invalidWord) {
       if (invalidWord.length >= 2 && invalidWord.length <= 8) {
         const validWord = findSimilarWord(invalidWord);
-        if (validWord) {
+        if (invalidWord.toLowerCase() !== invalidWord) {
+          return this.props.t('Word "{{invalidWord}}" contains upper case letters. All words must be lower case', { invalidWord });
+        } else if (validWord) {
           return this.props.t('Word "{{invalidWord}}" is not on the passphrase Word List. Most similar word on the list is "{{similarWord}}"', { invalidWord, similarWord: findSimilarWord(invalidWord) });
         }
       }

src/components/passphraseInput/index.test.js

@@ -59,6 +59,13 @@ describe('PassphraseInput', () => {
     expect(wrapper.props().onChange).to.have.been.calledWith(passphrase, SIMILAR_WORD_ERROR);
   });
 
+  const UPPER_CASE_ERROR = 'Word "WAGON" contains upper case letters. All words must be lower case';
+  it(`should call props.onChange with error='${UPPER_CASE_ERROR}' if an passphrase with a typo is entered`, () => {
+    const passphrase = 'WAGON stock borrow episode laundry kitten salute link globe zero feed marble';
+    wrapper.find('input').simulate('change', { target: { value: passphrase } });
+    expect(wrapper.props().onChange).to.have.been.calledWith(passphrase, UPPER_CASE_ERROR);
+  });
+
   const NOT_VALID_ERROR = 'Passphrase is not valid';
   it(`should call props.onChange with error="${NOT_VALID_ERROR}" if an otherwise invalid passphrase is entered`, () => {
     const passphrase = 'stock wagon borrow episode laundry kitten salute link globe zero feed marble';

src/utils/passphrase.js

@@ -88,7 +88,7 @@ export const generatePassphrase = ({ seed }) => (new mnemonic(new Buffer(seed.jo
    * @returns {bool} isValidPassphrase
    */
 export const isValidPassphrase = (passphrase) => {
-  const normalizedValue = passphrase.replace(/ +/g, ' ').trim().toLowerCase();
+  const normalizedValue = passphrase.replace(/ +/g, ' ').trim();
   let isValid;
   try {
     isValid = normalizedValue.split(' ').length >= 12 && mnemonic.isValid(normalizedValue);