Function ExtractDomainFromURL

pkg/stringutil/urls.go:41–57

ExtractDomainFromURL extracts the domain name from a URL string. Handles various URL formats including full URLs with protocols, URLs with ports, and plain domain names. This function uses net/url.Parse for proper URL parsing when a protocol is present, and falls back to string manipulation for oth

(urlStr string)

//	ExtractDomainFromURL("http://sub.domain.com:8080/path")       // returns "sub.domain.com"
//	ExtractDomainFromURL("localhost:8080")                        // returns "localhost"
func ExtractDomainFromURL(urlStr string) string {
	urlsLog.Printf("Extracting domain from URL: %s", urlStr)
	// Handle full URLs with protocols (http://, https://)
	if strings.HasPrefix(urlStr, "http://") || strings.HasPrefix(urlStr, "https://") {
		// Parse full URL
		parsedURL, err := url.Parse(urlStr)
		if err != nil {
			// Fall back to string manipulation if parsing fails
			urlsLog.Printf("URL parse failed, using fallback: %v", err)
			return extractDomainFallback(urlStr)
		}
		return parsedURL.Hostname()
	}

	// For URLs without protocol, use string manipulation
	return extractDomainFallback(urlStr)
}

// extractDomainFallback extracts domain using string manipulation.
// This handles URLs without protocols, CONNECT requests (domain:port format),