feat: validate user input for entity names

internal/util/string.go

@@ -0,0 +1,64 @@
+package util
+
+import (
+	"strings"
+	"unicode"
+)
+
+// Allowed special characters
+var allowedSpecialChars = map[rune]bool{
+	'@': true,
+	'^': true,
+	'~': true,
+	'-': true,
+	'_': true,
+}
+
+func ValidateTypeName(input string) (string, bool) {
+	// Trim leading and trailing spaces
+	trimmed := strings.TrimSpace(input)
+
+	// If the string is empty after trimming, return false
+	if len(trimmed) == 0 {
+		return "", false
+	}
+
+	runes := []rune(trimmed)
+
+	if len(runes) > 30 {
+		return "", false
+	}
+
+	// Dash cannot be at the beginning or end
+	if runes[0] == '-' || runes[len(runes)-1] == '-' {
+		return "", false
+	}
+
+	for _, r := range runes {
+		// Check if the character is a whitespace, which is not allowed
+		if unicode.IsSpace(r) {
+			return "", false
+		}
+
+		// Letters (including any alphabet) and digits are allowed
+		if unicode.IsLetter(r) || unicode.IsDigit(r) {
+			continue
+		}
+
+		// Combining marks (accents) are allowed
+		if unicode.IsMark(r) {
+			continue
+		}
+
+		// Check for allowed special characters
+		if allowedSpecialChars[r] {
+			continue
+		}
+
+		// If any other character is encountered, return false
+		return "", false
+	}
+
+	// Return the trimmed string and true if all conditions are met
+	return trimmed, true
+}