Namecoin: name script support in transaction.get_address_from_output_…

…script

electrum_nmc/names.py

@@ -0,0 +1,53 @@
+#!/usr/bin/env python
+#
+# Electrum-NMC - lightweight Namecoin client
+# Copyright (C) 2018 Namecoin Developers
+#
+# Permission is hereby granted, free of charge, to any person
+# obtaining a copy of this software and associated documentation files
+# (the "Software"), to deal in the Software without restriction,
+# including without limitation the rights to use, copy, modify, merge,
+# publish, distribute, sublicense, and/or sell copies of the Software,
+# and to permit persons to whom the Software is furnished to do so,
+# subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+def split_name_script(decoded):
+    # name_new TxOuts look like:
+    # NAME_NEW (hash) 2DROP (Bitcoin TxOut)
+    match = [ OP_NAME_NEW, opcodes.OP_PUSHDATA4, opcodes.OP_2DROP ]
+    if match_decoded(decoded[:len(match)], match):
+        return {"name_op": OP_NAME_NEW, "address_scriptPubKey": decoded[len(match):]}
+
+    # name_firstupdate TxOuts look like:
+    # NAME_FIRSTUPDATE (name) (rand) (value) 2DROP 2DROP (Bitcoin TxOut)
+    match = [ OP_NAME_FIRSTUPDATE, opcodes.OP_PUSHDATA4, opcodes.OP_PUSHDATA4, opcodes.OP_PUSHDATA4, opcodes.OP_2DROP, opcodes.OP_2DROP ]
+    if match_decoded(decoded[:len(match)], match):
+        return {"name_op": OP_NAME_FIRSTUPDATE, "address_scriptPubKey": decoded[len(match):]}
+
+    # name_update TxOuts look like:
+    # NAME_UPDATE (name) (value) 2DROP DROP (Bitcoin TxOut)
+    match = [ OP_NAME_UPDATE, opcodes.OP_PUSHDATA4, opcodes.OP_PUSHDATA4, opcodes.OP_2DROP, opcodes.OP_DROP ]
+    if match_decoded(decoded[:len(match)], match):
+        return {"name_op": OP_NAME_UPDATE, "address_scriptPubKey": decoded[len(match):]}
+
+    return {"name_op": None, "address_scriptPubKey": decoded}
+
+
+from .transaction import match_decoded, opcodes
+
+OP_NAME_NEW = opcodes.OP_1
+OP_NAME_FIRSTUPDATE = opcodes.OP_2
+OP_NAME_UPDATE = opcodes.OP_3
+

electrum_nmc/transaction.py

@@ -439,6 +439,9 @@ def get_address_from_output_script(_bytes, *, net=None):
     except MalformedBitcoinScript:
         decoded = None
 
+    # Strip the name prefix if one is present.
+    decoded = split_name_script(decoded)["address_scriptPubKey"]
+
     # The Genesis Block, self-payments, and pay-by-IP-address payments look like:
     # 65 BYTES:... CHECKSIG
     match = [ opcodes.OP_PUSHDATA4, opcodes.OP_CHECKSIG ]
@@ -1285,3 +1288,7 @@ def tx_from_str(txt):
     tx_dict = json.loads(str(txt))
     assert "hex" in tx_dict.keys()
     return tx_dict["hex"]
+
+
+from .names import split_name_script
+