Allow utxo address validation with script

Prior to this commit, the sendtomany.py script
would sometimes fail based on the output of the
RPC call gettxout returning only a script, and not
an address. After this commit, the validation will
still work correctly in these cases using the
chosen cryptoengine to convert from script to address.
Also notably, the return value of utxo set does
not include an 'address' key any more.
Tests are updated to reflect this.

jmclient/jmclient/blockchaininterface.py

@@ -387,13 +387,8 @@ class BitcoinCoreInterface(BlockchainInterface):
             if ret is None:
                 result.append(None)
             else:
-                if ret['scriptPubKey'].get('addresses'):
-                    address = ret['scriptPubKey']['addresses'][0]
-                else:
-                    address = None
                 result_dict = {'value': int(Decimal(str(ret['value'])) *
                                             Decimal('1e8')),
-                               'address': address,
                                'script': hextobin(ret['scriptPubKey']['hex'])}
                 if includeconf:
                     result_dict['confirms'] = int(ret['confirmations'])

jmclient/jmclient/commitment_utils.py

@@ -33,16 +33,19 @@ def get_utxo_info(upriv, utxo_binary=False):
         raise
     utxo_to_return = utxo_bin if utxo_binary else u
     return utxo_to_return, priv
-    
+
+def print_failed_addr_match(utxostr, addr1, addr2):
+    jmprint("privkey corresponds to the wrong address for utxo: " + utxostr, "error")
+    jmprint("blockchain returned address: {}".format(addr2), "error")
+    jmprint("your privkey gave this address: " + addr1, "error")
+    return False
+
 def validate_utxo_data(utxo_datas, retrieve=False, utxo_address_type="p2wpkh"):
     """For each (utxo, privkey), first
     convert the privkey and convert to address,
     then use the blockchain instance to look up
     the utxo and check that its address field matches.
     If retrieve is True, return the set of utxos and their values.
-    If segwit is true, assumes a p2sh wrapped p2wpkh, i.e.
-    native segwit is NOT currently supported here. If segwit
-    is false, p2pkh is assumed.
     """
     results = []
     for u, priv in utxo_datas:
@@ -52,10 +55,8 @@ def validate_utxo_data(utxo_datas, retrieve=False, utxo_address_type="p2wpkh"):
             sys.exit(EXIT_FAILURE)
         jmprint('validating this utxo: ' + utxostr, "info")
         # as noted in `ImportWalletMixin` code comments, there is not
-        # yet a functional auto-detection of key type from WIF, so the
-        # second argument is ignored; we assume p2sh-p2wpkh if segwit=True,
-        # p2pkh if segwit=False, and p2wpkh if segwit="native" (slightly
-        # ugly, just done for backwards compat.).
+        # yet a functional auto-detection of key type from WIF, hence
+        # the need for this additional switch:
         if utxo_address_type == "p2wpkh":
             engine = BTC_P2WPKH
         elif utxo_address_type == "p2sh-p2wpkh":
@@ -71,11 +72,9 @@ def validate_utxo_data(utxo_datas, retrieve=False, utxo_address_type="p2wpkh"):
         if len(res) != 1 or None in res:
             jmprint("utxo not found on blockchain: " + utxostr, "error")
             return False
-        if res[0]['address'] != addr:
-            jmprint("privkey corresponds to the wrong address for utxo: " + utxostr, "error")
-            jmprint("blockchain returned address: {}".format(res[0]['address']), "error")
-            jmprint("your privkey gave this address: " + addr, "error")
-            return False
+        returned_addr = engine.script_to_address(res[0]['script'])
+        if returned_addr != addr:
+            return print_failed_addr_match(utxostr, addr, returned_addr)
         if retrieve:
             results.append((u, res[0]['value']))
     jmprint('all utxos validated OK', "success")

jmclient/test/test_commitment_utils.py

@@ -1,8 +1,8 @@
 from commontest import DummyBlockchainInterface
 import pytest
 
-from jmbase import utxostr_to_utxo
-from jmclient import (load_test_config, jm_single)
+from jmbase import utxostr_to_utxo, hextobin
+from jmclient import (load_test_config, jm_single, BTC_P2WPKH)
 from jmclient.commitment_utils import get_utxo_info, validate_utxo_data
 from jmbitcoin import select_chain_params
 
@@ -20,7 +20,7 @@ def test_get_utxo_info():
     success, fakeutxo_bin = utxostr_to_utxo(fakeutxo)
     assert success
     fake_query_results = [{'value': 200000000,
-                                'address': iaddr,
+                                'script': BTC_P2WPKH.address_to_script(iaddr),
                                 'utxo': fakeutxo_bin,
                                 'confirms': 20}]    
     dbci.insert_fake_query_results(fake_query_results)
@@ -29,15 +29,15 @@ def test_get_utxo_info():
     assert u == fakeutxo
     assert priv == privkey
     #invalid format
-    with pytest.raises(Exception) as e_info:
+    with pytest.raises(Exception):
         u, priv = get_utxo_info(fakeutxo + privkey)
     #invalid index
     fu2 = "ab"*32 + ":-1"
-    with pytest.raises(Exception) as e_info:
+    with pytest.raises(Exception):
         u, priv = get_utxo_info(fu2 + "," + privkey)
     #invalid privkey
     p2 = privkey[:-1] + 'j'
-    with pytest.raises(Exception) as e_info:
+    with pytest.raises(Exception):
         u, priv = get_utxo_info(fakeutxo + "," + p2)
 
     utxodatas = [(fakeutxo_bin, privkey)]
@@ -46,7 +46,7 @@ def test_get_utxo_info():
     #try to retrieve
     retval = validate_utxo_data(utxodatas, True)
     assert retval[0] == (fakeutxo_bin, 200000000)
-    fake_query_results[0]['address'] = "fakeaddress"
+    fake_query_results[0]['script'] = hextobin("76a91479b000887626b294a914501a4cd226b58b23598388ac")
     dbci.insert_fake_query_results(fake_query_results)
     #validate should fail for wrong address
     retval = validate_utxo_data(utxodatas, False)
@@ -58,4 +58,4 @@ def test_get_utxo_info():
     assert not retval
     dbci.setQUSFail(False)
     select_chain_params("bitcoin/regtest")
-    jm_single().config.set("BLOCKCHAIN", "network", "mainnet")
+    jm_single().config.set("BLOCKCHAIN", "network", "regtest")

jmclient/test/test_wallets.py

@@ -50,7 +50,7 @@ def test_query_utxo_set(setup_wallets):
         includeconf=True, includeunconf=True)
     assert len(res1) == 1
     assert len(res2) == 2
-    assert all([x in res1[0] for x in ['script', 'address', 'value']])
+    assert all([x in res1[0] for x in ['script', 'value']])
     assert not 'confirms' in res1[0]
     assert 'confirms' in res2[0]
     assert 'confirms' in res2[1]