Properly handle error and improve error messages

utils/utils.go

@@ -145,12 +145,63 @@ func GenerateCSRFToken() (string, error) {
 	return csrfToken, nil
 }
 
-func SanitizeFilename(filename string) string {
-	invalidChars := []string{"\\", "/", ":", "*", "?", "\"", "<", ">", "|"}
-
-	for _, char := range invalidChars {
-		filename = strings.ReplaceAll(filename, char, "_")
+func ParseUserAgent(userAgent string) (map[string]string, map[string]string) {
+	browserInfo := make(map[string]string)
+	osInfo := make(map[string]string)
+	if strings.Contains(userAgent, "Firefox") {
+		browserInfo["browser"] = "Firefox"
+		parts := strings.Split(userAgent, "Firefox/")
+		if len(parts) > 1 {
+			version := strings.Split(parts[1], " ")[0]
+			browserInfo["version"] = version
+		}
+	} else if strings.Contains(userAgent, "Chrome") {
+		browserInfo["browser"] = "Chrome"
+		parts := strings.Split(userAgent, "Chrome/")
+		if len(parts) > 1 {
+			version := strings.Split(parts[1], " ")[0]
+			browserInfo["version"] = version
+		}
+	} else {
+		browserInfo["browser"] = "Unknown"
+		browserInfo["version"] = "Unknown"
 	}
 
-	return filename
+	if strings.Contains(userAgent, "Windows") {
+		osInfo["os"] = "Windows"
+		parts := strings.Split(userAgent, "Windows ")
+		if len(parts) > 1 {
+			version := strings.Split(parts[1], ";")[0]
+			osInfo["version"] = version
+		}
+	} else if strings.Contains(userAgent, "Macintosh") {
+		osInfo["os"] = "Mac OS"
+		parts := strings.Split(userAgent, "Mac OS X ")
+		if len(parts) > 1 {
+			version := strings.Split(parts[1], ";")[0]
+			osInfo["version"] = version
+		}
+	} else if strings.Contains(userAgent, "Linux") {
+		osInfo["os"] = "Linux"
+		osInfo["version"] = "Unknown"
+	} else if strings.Contains(userAgent, "Android") {
+		osInfo["os"] = "Android"
+		parts := strings.Split(userAgent, "Android ")
+		if len(parts) > 1 {
+			version := strings.Split(parts[1], ";")[0]
+			osInfo["version"] = version
+		}
+	} else if strings.Contains(userAgent, "iPhone") || strings.Contains(userAgent, "iPad") || strings.Contains(userAgent, "iPod") {
+		osInfo["os"] = "iOS"
+		parts := strings.Split(userAgent, "OS ")
+		if len(parts) > 1 {
+			version := strings.Split(parts[1], " ")[0]
+			osInfo["version"] = version
+		}
+	} else {
+		osInfo["os"] = "Unknown"
+		osInfo["version"] = "Unknown"
+	}
+
+	return browserInfo, osInfo
 }