"""Wallet utility functions."""
import base58
import base64
[docs]def pad(val: str) -> str:
"""Pad base64 values if need be: JWT calls to omit trailing padding."""
padlen = 4 - len(val) % 4
return val if padlen > 2 else (val + "=" * padlen)
[docs]def unpad(val: str) -> str:
"""Remove padding from base64 values if need be."""
return val.rstrip("=")
[docs]def b64_to_bytes(val: str, urlsafe=False) -> bytes:
"""Convert a base 64 string to bytes."""
if urlsafe:
return base64.urlsafe_b64decode(pad(val))
return base64.b64decode(pad(val))
[docs]def b64_to_str(val: str, urlsafe=False, encoding=None) -> str:
"""Convert a base 64 string to string on input encoding (default utf-8)."""
return b64_to_bytes(val, urlsafe).decode(encoding or "utf-8")
[docs]def bytes_to_b64(val: bytes, urlsafe=False, pad=True) -> str:
"""Convert a byte string to base 64."""
b64 = (
base64.urlsafe_b64encode(val).decode("ascii")
if urlsafe
else base64.b64encode(val).decode("ascii")
)
return b64 if pad else unpad(b64)
[docs]def str_to_b64(val: str, urlsafe=False, encoding=None, pad=True) -> str:
"""Convert a string to base64 string on input encoding (default utf-8)."""
return bytes_to_b64(val.encode(encoding or "utf-8"), urlsafe, pad)
[docs]def set_urlsafe_b64(val: str, urlsafe: bool = True) -> str:
"""Set URL safety in base64 encoding."""
if urlsafe:
return val.replace("+", "-").replace("/", "_")
return val.replace("-", "+").replace("_", "/")
[docs]def b58_to_bytes(val: str) -> bytes:
"""Convert a base 58 string to bytes."""
return base58.b58decode(val)
[docs]def bytes_to_b58(val: bytes) -> str:
"""Convert a byte string to base 58."""
return base58.b58encode(val).decode("ascii")