Adds validation function for passphrase

index.js

@@ -532,6 +532,27 @@ Client.prototype.recoverKeypair = function (passPhrase) {
   return this.getKeypair()
 }
 
+Client.prototype.isValidPassPhrase = function (passPhrase) {
+  if (!passPhrase || typeof passPhrase !== 'string') {
+    return false
+  }
+
+  passPhrase = passPhrase.split(' ')
+
+  if (passPhrase.length !== PASSPHRASE_LENGTH) {
+    this.memo('isValidPassPhrase', `invalid passphrase: must be ${PASSPHRASE_LENGTH} words`)
+    return false
+  }
+  try {
+    niceware.passphraseToBytes(passPhrase)
+  } catch (ex) {
+    this.memo('isValidPassPhrase', ex.toString())
+    return false
+  }
+
+  return true
+}
+
 Client.prototype.recoverWallet = function (recoveryId, passPhrase, callback) {
   const self = this
   let path, keypair

test/indexTest.js

@@ -78,3 +78,17 @@ test('initWithFixupState', (t) => {
   t.equal(crypto.uint8ToHex(signingKey.secretKey), crypto.uint8ToHex(signingKey2.secretKey))
   t.equal(crypto.uint8ToHex(signingKey.publicKey), crypto.uint8ToHex(signingKey2.publicKey))
 })
+
+test('isValidPassPhrase', (t) => {
+  t.plan(4)
+
+  const client = new Ledger(null, options)
+
+  client.generateKeypair()
+  const passPhrase = client.getWalletPassphrase().join(' ')
+  t.equal(client.isValidPassPhrase(passPhrase), true, 'Should return true for valid passphrase')
+  t.equal(client.isValidPassPhrase(123), false, 'Should return false for number')
+  t.equal(client.isValidPassPhrase(null), false, 'Should return false for null')
+  t.equal(client.isValidPassPhrase(), false, 'Should return false for empty param')
+  t.equal(client.isValidPassPhrase('asdfasfsadf'), false, 'Should return false for random string')
+})