See which AI bots read your site, and who they send back.

// Simplitas AI Traffic collector
const ENDPOINT = 'https://www.simplitas.com/api/v1/logs'
const AI_BOT = /ChatGPT-User|OAI-SearchBot|GPTBot|Claude-User|Claude-SearchBot|ClaudeBot|anthropic-ai|Perplexity-User|PerplexityBot|Gemini-Deep-Research|Google-CloudVertexBot|GoogleOther|meta-externalfetcher|meta-externalagent|MistralAI-User|DuckAssistBot|Applebot|Amazonbot|YouBot|Bytespider|CCBot|cohere-ai|cohere-training-data-crawler|Diffbot/i
const AI_SOURCE = /chatgpt\.com|chat\.openai\.com|perplexity\.ai|gemini\.google\.com|copilot\.microsoft\.com|claude\.ai|chat\.deepseek\.com|meta\.ai|grok\.com|chat\.mistral\.ai|you\.com/i

export default {
  async fetch(request, env, ctx) {
    // The response is passed through untouched and its body is never read.
    const response = await fetch(request)

    const url = new URL(request.url)
    const userAgent = request.headers.get('user-agent') || ''
    const referer = request.headers.get('referer') || ''
    const utmSource = url.searchParams.get('utm_source') || ''

    if (AI_BOT.test(userAgent) || AI_SOURCE.test(referer) || AI_SOURCE.test(utmSource)) {
      const log = {
        timestamp: Date.now(),
        host: url.hostname,
        method: request.method,
        path: url.pathname,
        status_code: response.status,
        user_agent: userAgent,
        referer,
        query_params: utmSource ? { utm_source: utmSource } : {},
        bytes_sent: Number(response.headers.get('content-length')) || 0,
      }
      // waitUntil + catch: reporting can be slow or fail without the visitor ever noticing.
      ctx.waitUntil(
        fetch(ENDPOINT, {
          method: 'POST',
          headers: { 'Content-Type': 'application/json', 'X-API-Key': env.SIMPLITAS_LOG_TOKEN },
          body: JSON.stringify([log]),
          signal: AbortSignal.timeout(5000),
        }).catch(() => {}),
      )
    }

    return response
  },
}