Refresh Token轮换逻辑

def solve():
    from pyodide.http import open_url
    from io import StringIO
    tokens_csv = open_url(____).read()
    import pandas as pd, base64, hmac, hashlib, json
    from io import StringIO
    tokens = pd.read_csv(StringIO(____))
    SECRET = '____'
    NOW = ____
    revoked_jtis = set(tokens[tokens['____']==____]['____'].tolist())
    def b64url(____):
        if isinstance(____): s = s.encode()
        return base64.urlsafe_b64encode(____).rstrip(____).decode()
    def make_access_token(____):
        h = b64url(json.dumps(____))
        p = b64url(json.dumps({'____':str(____),'____':'____','____':NOW,'____':NOW+____}))
        sig = b64url(hmac.new(SECRET.encode(), f'____'.encode(), hashlib.sha256).digest())
        return f'____'
    def refresh_token(____):
        if row['____'] == ____: return None, '____'
        if row['____'] < now: return None, '____'
        if row['____'] != '____': return None, '____'
        new_access = make_access_token(____)
        return new_access, '____'
    refresh_rows = tokens[tokens['____']=='____']
    for _, row in refresh_rows.iterrows():
        new_tok, msg = refresh_token(____)
        print(____)