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import crypto from 'crypto';

function verify(rawBody, header, secret, toleranceSeconds = 300) {
  const t = Number(/(^|,)t=(\d+)/.exec(header)?.[2]);
  if (!t || Math.abs(Date.now() / 1000 - t) > toleranceSeconds) return false;
  const expected = crypto.createHmac('sha256', secret)
    .update(`${t}.${rawBody}`).digest('hex');
  return header.split(',').some((p) => {
    if (!p.startsWith('v1=')) return false;
    const got = Buffer.from(p.slice(3));
    const exp = Buffer.from(expected);
    return got.length === exp.length && crypto.timingSafeEqual(got, exp);
  });
}

import hmac, hashlib, re, time

def verify(raw_body: bytes, header: str, secret: str, tolerance=300) -> bool:
    m = re.search(r'(^|,)t=(\d+)', header)
    if not m:
        return False
    t = int(m.group(2))
    if abs(time.time() - t) > tolerance:
        return False
    expected = hmac.new(secret.encode(), f"{t}.".encode() + raw_body, hashlib.sha256).hexdigest()
    for part in header.split(','):
        if part.startswith('v1=') and hmac.compare_digest(part[3:], expected):
            return True
    return False