Amazon CloudFront.

// AWS Lambda@Edge (Viewer Request) - AI bot tracking (ESM)
// Also supports CloudFront log record events.
// Set Lambda environment variables: XSEEK_API_KEY, XSEEK_WEBSITE_ID

const AI_BOTS = [
  { name: 'anthropic-ai', pattern: /anthropic-ai/i },
  { name: 'claudebot', pattern: /ClaudeBot/i },
  { name: 'claude-web', pattern: /claude-web/i },
  { name: 'claude-user', pattern: /Claude-User/i },
  { name: 'claude-searchbot', pattern: /Claude-SearchBot/i },
  { name: 'claude-code', pattern: /claude-code\//i },
  { name: 'perplexitybot', pattern: /PerplexityBot/i },
  { name: 'perplexity-user', pattern: /Perplexity-User/i },
  { name: 'grokbot', pattern: /GrokBot(?!.*DeepSearch)/i },
  { name: 'grok-search', pattern: /xAI-Grok/i },
  { name: 'grok-deepsearch', pattern: /Grok-DeepSearch/i },
  { name: 'GPTBot', pattern: /GPTBot/i },
  { name: 'chatgpt-user', pattern: /ChatGPT-User/i },
  { name: 'oai-searchbot', pattern: /OAI-SearchBot/i },
  { name: 'google-extended', pattern: /Google-Extended/i },
  { name: 'Google-Agent', pattern: /Google-Agent/i },
  { name: 'applebot', pattern: /Applebot(?!-Extended)/i },
  { name: 'applebot-extended', pattern: /Applebot-Extended/i },
  { name: 'meta-external', pattern: /meta-externalagent/i },
  { name: 'meta-externalfetcher', pattern: /meta-externalfetcher/i },
  { name: 'bingbot', pattern: /Bingbot(?!.*AI)/i },
  { name: 'bingpreview', pattern: /bingbot.*Chrome/i },
  { name: 'microsoftpreview', pattern: /MicrosoftPreview/i },
  { name: 'cohere-ai', pattern: /cohere-ai/i },
  { name: 'cohere-training-data-crawler', pattern: /cohere-training-data-crawler/i },
  { name: 'youbot', pattern: /YouBot/i },
  { name: 'duckassistbot', pattern: /DuckAssistBot/i },
  { name: 'semanticscholarbot', pattern: /SemanticScholarBot/i },
  { name: 'ccbot', pattern: /CCBot/i },
  { name: 'ai2bot', pattern: /AI2Bot/i },
  { name: 'ai2bot-dolma', pattern: /AI2Bot-Dolma/i },
  { name: 'aihitbot', pattern: /aiHitBot/i },
  { name: 'amazonbot', pattern: /Amazonbot/i },
  { name: 'novaact', pattern: /NovaAct/i },
  { name: 'brightbot', pattern: /Brightbot/i },
  { name: 'bytespider', pattern: /Bytespider/i },
  { name: 'tiktokspider', pattern: /TikTokSpider/i },
  { name: 'cotoyogi', pattern: /Cotoyogi/i },
  { name: 'crawlspace', pattern: /Crawlspace/i },
  { name: 'pangubot', pattern: /PanguBot/i },
  { name: 'petalbot', pattern: /PetalBot/i },
  { name: 'sidetrade-indexer', pattern: /Sidetrade indexer bot/i },
  { name: 'timpibot', pattern: /Timpibot/i },
  { name: 'omgili', pattern: /omgili/i },
  { name: 'omgilibot', pattern: /omgilibot/i },
  { name: 'webzio-extended', pattern: /Webzio-Extended/i },
  { name: 'baiduspider', pattern: /Baiduspider/i },
  { name: 'mistralai-user', pattern: /MistralAI-User/i }
];

import https from 'node:https';

function safeDecode(value) {
  if (!value || value === '-') {
    return '';
  }
  try {
    return decodeURIComponent(value);
  } catch {
    return value;
  }
}

function postToXseek(payload) {
  return new Promise((resolve) => {
    const body = JSON.stringify(payload);
    const req = https.request(
      {
        hostname: 'www.xseek.io',
        path: '/api/track-ai-bot',
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Content-Length': Buffer.byteLength(body),
          'x-api-key': 'PUT YOUR API KEY HERE',
        },
      },
      (res) => {
        res.on('data', () => {});
        res.on('end', resolve);
      }
    );
    req.on('error', resolve);
    req.write(body);
    req.end();
  });
}

function parseViewerRequest(request) {
  const headers = request.headers || {};
  const userAgent = headers['user-agent']?.[0]?.value || '';
  const host = headers.host?.[0]?.value || headers['x-host-header']?.[0]?.value || '';
  const query = request.querystring ? `?${request.querystring}` : '';
  const url = host ? `https://${host}${request.uri}${query}` : `${request.uri}${query}`;
  const ip =
    headers['x-forwarded-for']?.[0]?.value?.split(',')[0]?.trim() ||
    request.clientIp ||
    '';
  const referer = headers.referer?.[0]?.value || undefined;

  return { userAgent, url, ip, referer };
}

function parseLogRecord(record) {
  const rawUserAgent = record['cs(User-Agent)'] || '';
  const userAgent = safeDecode(rawUserAgent);
  const host = record['cs(Host)'] || record['x-host-header'] || '';
  const uri = record['cs-uri-stem'] || '/';
  const query = record['cs-uri-query'];
  const queryString = query && query !== '-' ? `?${query}` : '';
  const url = host ? `https://${host}${uri}${queryString}` : `${uri}${queryString}`;
  const ip =
    record['c-ip'] ||
    (record['x-forwarded-for'] || '').split(',')[0]?.trim() ||
    '';
  const refererRaw = record['cs(Referer)'];
  const referer = refererRaw && refererRaw !== '-' ? safeDecode(refererRaw) : undefined;

  return { userAgent, url, ip, referer };
}

function extractRequestInfo(event) {
  const viewerRequest = event?.Records?.[0]?.cf?.request;
  if (viewerRequest) {
    return parseViewerRequest(viewerRequest);
  }

  const record = Array.isArray(event) ? event[0] : event?.Records?.[0] ?? event;
  if (record && typeof record === 'object' && (record['cs(User-Agent)'] || record['cs-uri-stem'])) {
    return parseLogRecord(record);
  }

  return null;
}

export const handler = async (event) => {
  const request = event?.Records?.[0]?.cf?.request;
  const info = extractRequestInfo(event);
  const userAgent = info?.userAgent || '';

  let detectedBot = null;
  for (const bot of AI_BOTS) {
    if (bot.pattern.test(userAgent)) {
      detectedBot = bot.name;
      break;
    }
  }

  if (detectedBot && info) {
    await postToXseek({
      botName: detectedBot,
      userAgent,
      url: info.url,
      ip: info.ip || undefined,
      referer: info.referer,
      websiteId: 'PUT YOUR WEBSITE ID HERE',
    });
  }

  // Always continue to the origin (Viewer Request). For log events, return the event.
  return request || event;
};