Vercel

import { NextResponse } from 'next/server'
import type { NextRequest } from 'next/server'

const RANKLY_INGEST = 'https://ingest.tryrankly.com/ingest/vercel'
const RANKLY_TENANT_TOKEN = 'tnt_your_token'

const BOT_UA_RE = /\b(GPTBot|ChatGPT-User|OAI-SearchBot|ClaudeBot|Claude-User|PerplexityBot|Perplexity-User|Google-Extended|Bytespider|Amazonbot|Applebot-Extended|DuckAssistBot|GrokBot|CCBot|Meta-ExternalAgent|MistralAI-User|cohere-ai|Amazon-Rufus|Shop-Agent)\b/i

export const config = { matcher: '/:path*' }

export default async function middleware(req: NextRequest) {
  const ua = req.headers.get('user-agent') || ''
  const sigAgent = req.headers.get('signature-agent')
  const u = new URL(req.url)
  const isFavicon = /^\/favicon[.-]|^\/apple-touch-icon/i.test(u.pathname)
  const LLM_REF_RE = /(^|\.)(chatgpt\.com|openai\.com|perplexity\.ai|claude\.ai|gemini\.google\.com|copilot\.microsoft\.com|you\.com|grok\.com|mistral\.ai)$/i
  let llmReferred = false
  try { const rh = req.headers.get('referer'); if (rh) llmReferred = LLM_REF_RE.test(new URL(rh).hostname) } catch (_) {}

  if (BOT_UA_RE.test(ua) || sigAgent || isFavicon || llmReferred) {
    const payload = {
      timestamp: Date.now(),
      requestMethod: req.method,
      host: u.host,
      requestPath: u.pathname,
      requestUserAgent: ua,
      clientIp: (req.headers.get('x-forwarded-for') || '').split(',')[0].trim() || null,
      referer: req.headers.get('referer') || null,
      requestId: req.headers.get('x-vercel-id') || null,
      signatureAgent: sigAgent,
      signatureInput: req.headers.get('signature-input'),
      signature: req.headers.get('signature'),
    }
    fetch(RANKLY_INGEST + '?tenant=' + RANKLY_TENANT_TOKEN, {
      method: 'POST',
      headers: { 'content-type': 'application/json' },
      body: JSON.stringify(payload),
      keepalive: true,
    }).catch(() => {})
  }
  return NextResponse.next()
}