61 lines
1.2 KiB
Python
61 lines
1.2 KiB
Python
# scopes.util
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import base64
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from collections.abc import Iterable
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import hashlib
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from secrets import choice
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import string
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# symbols and keywords
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class Symbol(str):
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def __repr__(self):
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return f'<{self}>'
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class Symbols:
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def __getattr__(self, k):
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sym = Symbol(k)
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setattr(self, k, sym)
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return sym
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def __call__(self, k):
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return getattr(self, k)
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keywords = Symbols()
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# list / iterable utilities
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def flatten(*it, ignore_none=False):
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accu = []
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def doit(it):
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if ignore_none and it is None:
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return
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if isinstance(it, Iterable):
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for t in it:
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doit(t)
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else:
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accu.append(it)
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doit(it)
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return accu
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# random strings, hashes, encodings
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# for authentication, encryption, and other purposes
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BASE = string.ascii_letters + string.digits
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BASE2 = BASE + '-._~'
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def rndstr(size=16):
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return ''.join([choice(BASE) for _ in range(size)])
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def rndstr2(size=64):
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return ''.join([choice(BASE2) for _ in range(size)])
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def b64e(b):
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return base64.urlsafe_b64encode(b).rstrip(b'=')
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def hashS256(s):
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h = hashlib.sha256(s.encode('ascii')).digest()
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return b64e(h).decode('ascii')
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