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feat: code quality (#59)

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* feat: code quality
* fixup!
This commit is contained in:
dni ⚡ 2024-08-05 11:49:50 +02:00 • committed by GitHub
commit badc420069
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GPG key ID: B5690EEEBB952194
29 changed files with 3048 additions and 212 deletions
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40
nostr/bech32.py
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@ -23,21 +23,25 @@
from enum import Enum
class Encoding(Enum):
"""Enumeration type to list the various supported encodings."""
BECH32 = 1
BECH32M = 2
CHARSET = "qpzry9x8gf2tvdw0s3jn54khce6mua7l"
BECH32M_CONST = 0x2bc830a3
BECH32M_CONST = 0x2BC830A3
def bech32_polymod(values):
"""Internal function that computes the Bech32 checksum."""
generator = [0x3b6a57b2, 0x26508e6d, 0x1ea119fa, 0x3d4233dd, 0x2a1462b3]
generator = [0x3B6A57B2, 0x26508E6D, 0x1EA119FA, 0x3D4233DD, 0x2A1462B3]
chk = 1
for value in values:
top = chk >> 25
chk = (chk & 0x1ffffff) << 5 ^ value
chk = (chk & 0x1FFFFFF) << 5 ^ value
for i in range(5):
chk ^= generator[i] if ((top >> i) & 1) else 0
return chk
@ -57,37 +61,41 @@ def bech32_verify_checksum(hrp, data):
return Encoding.BECH32M
return None
def bech32_create_checksum(hrp, data, spec):
"""Compute the checksum values given HRP and data."""
values = bech32_hrp_expand(hrp) + data
const = BECH32M_CONST if spec == Encoding.BECH32M else 1
polymod = bech32_polymod(values + [0, 0, 0, 0, 0, 0]) ^ const
polymod = bech32_polymod([*values, 0, 0, 0, 0, 0, 0]) ^ const
return [(polymod >> 5 * (5 - i)) & 31 for i in range(6)]
def bech32_encode(hrp, data, spec):
"""Compute a Bech32 string given HRP and data values."""
combined = data + bech32_create_checksum(hrp, data, spec)
return hrp + '1' + ''.join([CHARSET[d] for d in combined])
return hrp + "1" + "".join([CHARSET[d] for d in combined])
def bech32_decode(bech):
"""Validate a Bech32/Bech32m string, and determine HRP and data."""
if ((any(ord(x) < 33 or ord(x) > 126 for x in bech)) or
(bech.lower() != bech and bech.upper() != bech)):
if (any(ord(x) < 33 or ord(x) > 126 for x in bech)) or (
bech.lower() != bech and bech.upper() != bech
):
return (None, None, None)
bech = bech.lower()
pos = bech.rfind('1')
pos = bech.rfind("1")
if pos < 1 or pos + 7 > len(bech) or len(bech) > 90:
return (None, None, None)
if not all(x in CHARSET for x in bech[pos+1:]):
if not all(x in CHARSET for x in bech[pos + 1 :]):
return (None, None, None)
hrp = bech[:pos]
data = [CHARSET.find(x) for x in bech[pos+1:]]
data = [CHARSET.find(x) for x in bech[pos + 1 :]]
spec = bech32_verify_checksum(hrp, data)
if spec is None:
return (None, None, None)
return (hrp, data[:-6], spec)
def convertbits(data, frombits, tobits, pad=True):
"""General power-of-2 base conversion."""
acc = 0
@ -114,6 +122,7 @@ def convertbits(data, frombits, tobits, pad=True):
def decode(hrp, addr):
"""Decode a segwit address."""
hrpgot, data, spec = bech32_decode(addr)
assert data, "Invalid bech32 string"
if hrpgot != hrp:
return (None, None)
decoded = convertbits(data[1:], 5, 8, False)
@ -123,7 +132,12 @@ def decode(hrp, addr):
return (None, None)
if data[0] == 0 and len(decoded) != 20 and len(decoded) != 32:
return (None, None)
if data[0] == 0 and spec != Encoding.BECH32 or data[0] != 0 and spec != Encoding.BECH32M:
if (
data[0] == 0
and spec != Encoding.BECH32
or data[0] != 0
and spec != Encoding.BECH32M
):
return (None, None)
return (data[0], decoded)
@ -131,7 +145,9 @@ def decode(hrp, addr):
def encode(hrp, witver, witprog):
"""Encode a segwit address."""
spec = Encoding.BECH32 if witver == 0 else Encoding.BECH32M
ret = bech32_encode(hrp, [witver] + convertbits(witprog, 8, 5), spec)
bits = convertbits(witprog, 8, 5)
assert bits, "Invalid witness program"
ret = bech32_encode(hrp, [witver, *bits], spec)
if decode(hrp, ret) == (None, None):
return None
return ret