HMAC请求签名实现

def solve():
    from pyodide.http import open_url
    from io import StringIO
    api_keys_csv = open_url(____).read()
    import hmac, hashlib, json
    SECRET = '____'
    def sign_request(____):
        body_str = json.dumps(____) if isinstance(____) else body
        msg = f'____'
        return hmac.new(secret.encode(), msg.encode(), hashlib.sha256).hexdigest()
    def verify_request(____):
        if abs(____) > max_skew:
            return False, '____'
        expected = sign_request(____)
        ok = hmac.compare_digest(____)
        return ok, '____' if ok else '____'
    ts = ____
    body = {'____':'____','____':____}
    sig = sign_request(____)
    print(____)
    cases = [(____),(____),(____)]
    for t, s, label in cases:
        ok, msg = verify_request(____)
        print(____)