backend moved to separate directory

backend: deleted the old structure

go-backend/internal/validation/general_validation.go

@@ -0,0 +1,34 @@
+package validation
+
+import (
+	"regexp"
+	"strings"
+
+	"github.com/go-playground/validator/v10"
+)
+
+var xssPatterns = []*regexp.Regexp{
+	regexp.MustCompile(`(?i)<script`),
+	regexp.MustCompile(`(?i)javascript:`),
+	regexp.MustCompile(`(?i)on\w+\s*=`),
+	regexp.MustCompile(`(?i)(vbscript|data):`),
+	regexp.MustCompile(`(?i)<(iframe|object|embed|applet)`),
+	regexp.MustCompile(`(?i)expression\s*\(`),
+	regexp.MustCompile(`(?i)url\s*\(`),
+	regexp.MustCompile(`(?i)<\?`),
+	regexp.MustCompile(`(?i)<%`),
+	regexp.MustCompile(`(?i)<!\[CDATA\[`),
+	regexp.MustCompile(`(?i)<(svg|animate)`),
+	regexp.MustCompile(`(?i)<(audio|video|source)`),
+	regexp.MustCompile(`(?i)base64`),
+}
+
+func ValidateSafeContent(fl validator.FieldLevel) bool {
+	input := strings.ToLower(fl.Field().String())
+	for _, pattern := range xssPatterns {
+		if pattern.MatchString(input) {
+			return false
+		}
+	}
+	return true
+}