Allow createwallet to take empty passwords to make unencrypted wallets

Allow createwallet to take the empty string as a password and interpret that
as leaving the wallet unencrypted. Also warn when that happens.

1 files changed, 12 insertions, 3 deletions

diff --git a/test/functional/wallet_createwallet.py b/test/functional/wallet_createwallet.py
index 294f90a0fa..e302e499f4 100755
--- a/test/functional/wallet_createwallet.py
+++ b/test/functional/wallet_createwallet.py
@@ -116,11 +116,20 @@ class CreateWalletTest(BitcoinTestFramework):
         walletinfo = w6.getwalletinfo()
         assert_equal(walletinfo['keypoolsize'], 1)
         assert_equal(walletinfo['keypoolsize_hd_internal'], 1)
-        # Empty passphrase, error
-        assert_raises_rpc_error(-16, 'Cannot encrypt a wallet with a blank password', self.nodes[0].createwallet, 'w7', False, False, '')
+        # Allow empty passphrase, but there should be a warning
+        resp = self.nodes[0].createwallet(wallet_name='w7', disable_private_keys=False, blank=False, passphrase='')
+        assert_equal(resp['warning'], 'Empty string given as passphrase, wallet will not be encrypted.')
+        w7 = node.get_wallet_rpc('w7')
+        assert_raises_rpc_error(-15, 'Error: running with an unencrypted wallet, but walletpassphrase was called.', w7.walletpassphrase, '', 10)
+
+        self.log.info('Test making a wallet with avoid reuse flag')
+        self.nodes[0].createwallet('w8', False, False, '', True) # Use positional arguments to check for bug where avoid_reuse could not be set for wallets without needing them to be encrypted
+        w8 = node.get_wallet_rpc('w8')
+        assert_raises_rpc_error(-15, 'Error: running with an unencrypted wallet, but walletpassphrase was called.', w7.walletpassphrase, '', 10)
+        assert_equal(w8.getwalletinfo()["avoid_reuse"], True)
 
         self.log.info('Using a passphrase with private keys disabled returns error')
-        assert_raises_rpc_error(-4, 'Passphrase provided but private keys are disabled. A passphrase is only used to encrypt private keys, so cannot be used for wallets with private keys disabled.', self.nodes[0].createwallet, wallet_name='w8', disable_private_keys=True, passphrase='thisisapassphrase')
+        assert_raises_rpc_error(-4, 'Passphrase provided but private keys are disabled. A passphrase is only used to encrypt private keys, so cannot be used for wallets with private keys disabled.', self.nodes[0].createwallet, wallet_name='w9', disable_private_keys=True, passphrase='thisisapassphrase')
 
 if __name__ == '__main__':
     CreateWalletTest().main()