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import base64
import json
import struct
def to_bytes(x, charset="utf-8", errors="strict"):
if x is None:
return None
if isinstance(x, bytes):
return x
if isinstance(x, str):
return x.encode(charset, errors)
if isinstance(x, (int, float)):
return str(x).encode(charset, errors)
return bytes(x)
def to_unicode(x, charset="utf-8", errors="strict"):
if x is None or isinstance(x, str):
return x
if isinstance(x, bytes):
return x.decode(charset, errors)
return str(x)
def to_native(x, encoding="ascii"):
if isinstance(x, str):
return x
return x.decode(encoding)
def json_loads(s):
return json.loads(s)
def json_dumps(data, ensure_ascii=False):
return json.dumps(data, ensure_ascii=ensure_ascii, separators=(",", ":"))
def urlsafe_b64decode(s):
s += b"=" * (-len(s) % 4)
return base64.urlsafe_b64decode(s)
def urlsafe_b64encode(s):
return base64.urlsafe_b64encode(s).rstrip(b"=")
def base64_to_int(s):
data = urlsafe_b64decode(to_bytes(s, charset="ascii"))
buf = struct.unpack(f"{len(data)}B", data)
return int("".join([f"{byte:02x}" for byte in buf]), 16)
def int_to_base64(num):
if num < 0:
raise ValueError("Must be a positive integer")
s = num.to_bytes((num.bit_length() + 7) // 8, "big", signed=False)
return to_unicode(urlsafe_b64encode(s))
def json_b64encode(text):
if isinstance(text, dict):
text = json_dumps(text)
return urlsafe_b64encode(to_bytes(text))
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