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80 lines
2.3 KiB
Python
80 lines
2.3 KiB
Python
#!/usr/bin/env python3
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# Copyright (c) 2022 The Bitcoin Core developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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import base64
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from .messages import (
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CTransaction,
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deser_string,
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from_binary,
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ser_compact_size,
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)
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class PSBTMap:
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"""Class for serializing and deserializing PSBT maps"""
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def __init__(self, map=None):
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self.map = map if map is not None else {}
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def deserialize(self, f):
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m = {}
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while True:
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k = deser_string(f)
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if len(k) == 0:
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break
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v = deser_string(f)
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if len(k) == 1:
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k = k[0]
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assert k not in m
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m[k] = v
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self.map = m
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def serialize(self):
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m = b""
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for k,v in self.map.items():
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if isinstance(k, int) and 0 <= k and k <= 255:
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k = bytes([k])
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m += ser_compact_size(len(k)) + k
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m += ser_compact_size(len(v)) + v
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m += b"\x00"
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return m
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class PSBT:
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"""Class for serializing and deserializing PSBTs"""
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def __init__(self):
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self.g = PSBTMap()
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self.i = []
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self.o = []
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self.tx = None
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def deserialize(self, f):
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assert f.read(5) == b"psbt\xff"
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self.g = from_binary(PSBTMap, f)
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assert 0 in self.g.map
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self.tx = from_binary(CTransaction, self.g.map[0])
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self.i = [from_binary(PSBTMap, f) for _ in self.tx.vin]
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self.o = [from_binary(PSBTMap, f) for _ in self.tx.vout]
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return self
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def serialize(self):
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assert isinstance(self.g, PSBTMap)
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assert isinstance(self.i, list) and all(isinstance(x, PSBTMap) for x in self.i)
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assert isinstance(self.o, list) and all(isinstance(x, PSBTMap) for x in self.o)
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assert 0 in self.g.map
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tx = from_binary(CTransaction, self.g.map[0])
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assert len(tx.vin) == len(self.i)
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assert len(tx.vout) == len(self.o)
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psbt = [x.serialize() for x in [self.g] + self.i + self.o]
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return b"psbt\xff" + b"".join(psbt)
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def to_base64(self):
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return base64.b64encode(self.serialize()).decode("utf8")
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@classmethod
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def from_base64(cls, b64psbt):
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return from_binary(cls, base64.b64decode(b64psbt))
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