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added mk_opreturn #94

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added mk_opreturn #94

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28 changes: 28 additions & 0 deletions bitcoin/transaction.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
#!/usr/bin/python
import binascii, re, json, copy, sys
from bitcoin.main import *
from btc.pyspecials import safe_hexlify, from_string_to_bytes, from_int_to_byte, from_string_to_bytes
from _functools import reduce

### Hex to bin converter and vice versa for objects
Expand Down Expand Up @@ -480,3 +481,30 @@ def mksend(*args):
outputs2 += [{"address": change, "value": isum-osum-fee}]

return mktx(ins, outputs2)

def mk_opreturn(msg, rawtx=None, json=0):
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the json parameter actually needs to be renamed jsonfmt, since return orhex if not json else orjson will never return orhex (since json is the name of the module)

def op_push(data):
import struct
if len(data) < 0x4c:
return from_int_to_byte(len(data)) + data
elif len(data) < 0xff:
return from_int_to_byte(76) + struct.pack('<B', len(data)) + from_string_to_bytes(data)
elif len(data) < 0xffff:
return from_int_to_byte(77) + struct.pack('<H', len(data)) + from_string_to_bytes(data)
elif len(data) < 0xffffffff:
return from_int_to_byte(78) + struct.pack('<I', len(data)) + from_string_to_bytes(data)
else: raise Exception("Input data error. Rawtx must be hex chars" \
+ "0xffffffff > len(data) > 0 ??")

orhex = safe_hexlify(b'\x6a' + op_push(msg))
orjson = {'script' : orhex, 'value' : 0}
if rawtx is not None:
try:
txo = deserialize(rawtx)
if not 'outs' in txo.keys(): raise Exception("OP_Return cannot be the sole output!")
txo['outs'].append(orjson)
newrawtx = serialize(txo)
return newrawtx
except:
raise Exception("Raw Tx Error!")
return orhex if not json else orjson