Crawler Detector is a Golang package for detecting bots/crawlers/spiders via the user agent.
Run go get github.com/langaner/crawlerdetector.
detector := crawlerdetector.New()
isCrawler := detector.IsCrawler(r.Header.Get("User-Agent"))
if isCrawler {
// Do something
}
If you find a bot/spider/crawler user agent that Crawler Detector not detect, please submit a pull request with the regex pattern.