restructure project, add claudemd

go/httputil/useragent.go

@@ -0,0 +1,138 @@
+package httputil
+
+import (
+	"regexp"
+	"strings"
+)
+
+func ParseUserAgent(ua string) string {
+	if ua == "" {
+		return "Unknown"
+	}
+
+	browser := parseBrowser(ua)
+	os := parseOS(ua)
+
+	if browser == "" && os == "" {
+		return "Unknown"
+	}
+	if browser == "" {
+		return os
+	}
+	if os == "" {
+		return browser
+	}
+
+	return browser + " on " + os
+}
+
+func parseBrowser(ua string) string {
+	if match := regexp.MustCompile(`Edg(?:e|A|iOS)?/(\d+)`).FindStringSubmatch(ua); match != nil {
+		return "Edge " + match[1]
+	}
+
+	if match := regexp.MustCompile(`(?:OPR|Opera)[/ ](\d+)`).FindStringSubmatch(ua); match != nil {
+		return "Opera " + match[1]
+	}
+
+	if match := regexp.MustCompile(`SamsungBrowser/(\d+)`).FindStringSubmatch(ua); match != nil {
+		return "Samsung Browser " + match[1]
+	}
+
+	if strings.Contains(ua, "Chrome") && !strings.Contains(ua, "Chromium") {
+		if match := regexp.MustCompile(`Chrome/(\d+)`).FindStringSubmatch(ua); match != nil {
+			return "Chrome " + match[1]
+		}
+	}
+
+	if match := regexp.MustCompile(`Chromium/(\d+)`).FindStringSubmatch(ua); match != nil {
+		return "Chromium " + match[1]
+	}
+
+	if match := regexp.MustCompile(`Firefox/(\d+)`).FindStringSubmatch(ua); match != nil {
+		return "Firefox " + match[1]
+	}
+
+	if strings.Contains(ua, "Safari") && !strings.Contains(ua, "Chrome") {
+		if match := regexp.MustCompile(`Version/(\d+)`).FindStringSubmatch(ua); match != nil {
+			return "Safari " + match[1]
+		}
+		return "Safari"
+	}
+
+	if match := regexp.MustCompile(`MSIE (\d+)`).FindStringSubmatch(ua); match != nil {
+		return "Internet Explorer " + match[1]
+	}
+	if strings.Contains(ua, "Trident/") {
+		if match := regexp.MustCompile(`rv:(\d+)`).FindStringSubmatch(ua); match != nil {
+			return "Internet Explorer " + match[1]
+		}
+		return "Internet Explorer"
+	}
+
+	return ""
+}
+
+func parseOS(ua string) string {
+	if strings.Contains(ua, "iPhone") {
+		if match := regexp.MustCompile(`iPhone OS (\d+)[_\d]*`).FindStringSubmatch(ua); match != nil {
+			return "iOS " + match[1]
+		}
+		return "iOS"
+	}
+	if strings.Contains(ua, "iPad") {
+		if match := regexp.MustCompile(`CPU OS (\d+)[_\d]*`).FindStringSubmatch(ua); match != nil {
+			return "iPadOS " + match[1]
+		}
+		return "iPadOS"
+	}
+
+	if match := regexp.MustCompile(`Android (\d+)`).FindStringSubmatch(ua); match != nil {
+		return "Android " + match[1]
+	}
+
+	if strings.Contains(ua, "Windows") {
+		if strings.Contains(ua, "Windows NT 10.0") {
+			return "Windows 10/11"
+		}
+		if strings.Contains(ua, "Windows NT 6.3") {
+			return "Windows 8.1"
+		}
+		if strings.Contains(ua, "Windows NT 6.2") {
+			return "Windows 8"
+		}
+		if strings.Contains(ua, "Windows NT 6.1") {
+			return "Windows 7"
+		}
+		if strings.Contains(ua, "Windows NT 6.0") {
+			return "Windows Vista"
+		}
+		if strings.Contains(ua, "Windows NT 5.1") {
+			return "Windows XP"
+		}
+		return "Windows"
+	}
+
+	if strings.Contains(ua, "Mac OS X") || strings.Contains(ua, "Macintosh") {
+		if match := regexp.MustCompile(`Mac OS X (\d+)[_.](\d+)`).FindStringSubmatch(ua); match != nil {
+			return "macOS " + match[1] + "." + match[2]
+		}
+		return "macOS"
+	}
+
+	if strings.Contains(ua, "Ubuntu") {
+		return "Ubuntu"
+	}
+	if strings.Contains(ua, "Fedora") {
+		return "Fedora"
+	}
+	if strings.Contains(ua, "Linux") {
+		return "Linux"
+	}
+
+	if strings.Contains(ua, "CrOS") {
+		return "Chrome OS"
+	}
+
+	return ""
+}