stellar: better way to handle default path

(maybe do this for other currencies too?)

trezorctl

@@ -942,25 +942,24 @@ def cosi_sign(connect, address, data, global_commitment, global_pubkey):
 # Stellar functions
 #
 @cli.command(help='Get Stellar public address')
-@click.option('-n', '--address', required=False, help="BIP32 path. Default primary account is m/44'/148'/0'. Always use hardened paths and the m/44'/148'/ prefix")
+@click.option('-n', '--address', required=False, help="BIP32 path. Always use hardened paths and the m/44'/148'/ prefix", default=stellar.DEFAULT_BIP32_PATH)
 @click.pass_obj
 def stellar_get_address(connect, address):
     client = connect()
-    address_n = stellar.expand_path_or_default(client, address)
+    address_n = tools.parse_path(address)
     # StellarPublicKey response
     response = client.stellar_get_public_key(address_n)
     return stellar.address_from_public_key(response.public_key)
 
 
 @cli.command(help='Sign a base64-encoded transaction envelope')
-@click.option('-n', '--address', required=False, help="BIP32 path. Default primary account is m/44'/148'/0'. Always use hardened paths and the m/44'/148'/ prefix")
+@click.option('-n', '--address', required=False, help="BIP32 path. Always use hardened paths and the m/44'/148'/ prefix", default=stellar.DEFAULT_BIP32_PATH)
 @click.option('-n', '--network-passphrase', default='Public Global Stellar Network ; September 2015', required=False, help="Network passphrase (blank for public network). Testnet is: 'Test SDF Network ; September 2015'")
 @click.argument('b64envelope')
 @click.pass_obj
 def stellar_sign_transaction(connect, b64envelope, address, network_passphrase):
     client = connect()
-
-    address_n = stellar.expand_path_or_default(client, address)
+    address_n = tools.parse_path(address)
     tx, operations = stellar.parse_transaction_bytes(base64.b64decode(b64envelope))
     resp = client.stellar_sign_transaction(tx, operations, address_n, network_passphrase)
 

trezorlib/stellar.py

@@ -30,14 +30,7 @@ OP_MANAGE_DATA = 10
 OP_BUMP_SEQUENCE = 11
 
 
-def expand_path_or_default(client, address):
-    """Uses client to parse address and returns an array of integers
-    If no address is specified, the default of m/44'/148'/0' is used
-    """
-    if address:
-        return client.expand_path(address)
-    else:
-        return client.expand_path("m/44'/148'/0'")
+DEFAULT_BIP32_PATH = "m/44h/148h/0h"
 
 
 def address_from_public_key(pk_bytes):

trezorlib/tests/device_tests/test_msg_stellar_get_public_key.py

@@ -12,11 +12,12 @@
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with this library.  If not, see <http://www.gnu.org/licenses/>.
+import pytest
 
 from .common import TrezorTest
 from .conftest import TREZOR_VERSION
 from trezorlib import stellar
-import pytest
+from trezorlib.tools import parse_path
 
 
 @pytest.mark.stellar
@@ -27,5 +28,5 @@ class TestMsgStellarGetPublicKey(TrezorTest):
         self.setup_mnemonic_nopin_nopassphrase()
 
         # GAK5MSF74TJW6GLM7NLTL76YZJKM2S4CGP3UH4REJHPHZ4YBZW2GSBPW
-        response = self.client.stellar_get_public_key(self.client.expand_path("m/44'/148'/0'"))
+        response = self.client.stellar_get_public_key(parse_path(stellar.DEFAULT_BIP32_PATH))
         assert stellar.address_from_public_key(response.public_key) == b'GAK5MSF74TJW6GLM7NLTL76YZJKM2S4CGP3UH4REJHPHZ4YBZW2GSBPW'

trezorlib/tests/device_tests/test_msg_stellar_sign_transaction.py

@@ -20,8 +20,10 @@
 from base64 import b64encode
 from .common import TrezorTest
 from .conftest import TREZOR_VERSION
-from binascii import hexlify, unhexlify
+from binascii import unhexlify
 from trezorlib import messages as proto
+from trezorlib import stellar
+from trezorlib.tools import parse_path
 import pytest
 
 
@@ -29,14 +31,12 @@ import pytest
 @pytest.mark.xfail(TREZOR_VERSION == 2, reason="T2 support is not yet finished")
 class TestMsgStellarSignTransaction(TrezorTest):
 
+    ADDRESS_N = parse_path(stellar.DEFAULT_BIP32_PATH)
+
     def get_network_passphrase(self):
         """Use the same passphrase as the network that generated the test XDR/signatures"""
         return "Integration Test Network ; zulucrypto"
 
-    def get_address_n(self):
-        """BIP32 path of the default account"""
-        return self.client.expand_path("m/44'/148'/0'")
-
     def test_sign_tx_bump_sequence_op(self):
         self.setup_mnemonic_nopin_nopassphrase()
 
@@ -44,7 +44,7 @@ class TestMsgStellarSignTransaction(TrezorTest):
         op.bump_to = 0x7fffffffffffffff
         tx = self._create_msg()
 
-        response = self.client.stellar_sign_transaction(tx, [op], self.get_address_n(), self.get_network_passphrase())
+        response = self.client.stellar_sign_transaction(tx, [op], self.ADDRESS_N, self.get_network_passphrase())
         assert b64encode(response.signature) == b'UAOL4ZPYIOzEgM66kBrhyNjLR66dNXtuNrmvd3m0/pc8qCSoLmYY4TybS0lHiMtb+LFZESTaxrpErMHz1sZ6DQ=='
 
     def test_sign_tx_account_merge_op(self):
@@ -55,7 +55,7 @@ class TestMsgStellarSignTransaction(TrezorTest):
 
         tx = self._create_msg()
 
-        response = self.client.stellar_sign_transaction(tx, [op], self.get_address_n(), self.get_network_passphrase())
+        response = self.client.stellar_sign_transaction(tx, [op], self.ADDRESS_N, self.get_network_passphrase())
         assert b64encode(response.signature) == b'gjoPRj4sW5o7NAXzYOqPK0uxfPbeKb4Qw48LJiCH/XUZ6YVCiZogePC0Z5ISUlozMh6YO6HoYtuLPbm7jq+eCA=='
 
     def _create_msg(self) -> proto.StellarSignTx: