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fix code_verifier_length #215

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fix code_verifier_length #215

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13 changes: 7 additions & 6 deletions static/pkce.py
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Original file line number Diff line number Diff line change
@@ -1,13 +1,14 @@
import hashlib
import base64
import re
import os
import random
import secrets
import string

# https://datatracker.ietf.org/doc/html/rfc7636#section-4.1
def get_pkce(code_challenge_method: str = "S256", code_challenge_length: int = 64):
hashers = {"S256": hashlib.sha256}
code_verifier_length = random.randint(43, 128)
code_verifier = base64.urlsafe_b64encode(os.urandom(code_verifier_length)).decode("utf-8")
code_verifier = re.sub("[^a-zA-Z0-9]+", "", code_verifier)
alpha = string.ascii_letters + string.digits + "-._~"
code_verifier_length = secrets.choice(range(43, 128 + 1))
code_verifier = "".join([secrets.choice(alpha) for _ in range(code_verifier_length)])

code_challenge = hashers.get(code_challenge_method)(
code_verifier.encode("utf-8")
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