initial commit

internal/validation/custom_validation.go

@@ -0,0 +1,83 @@
+package validation
+
+import (
+	"reflect"
+	"regexp"
+	"strings"
+
+	"github.com/go-playground/validator/v10"
+)
+
+var (
+	reUpper = regexp.MustCompile(`[A-Z]`)
+	reLower = regexp.MustCompile(`[a-z]`)
+	reDigit = regexp.MustCompile(`[0-9]`)
+	reSym   = regexp.MustCompile(`[^A-Za-z0-9]`)
+)
+
+func Password(fl validator.FieldLevel) bool {
+	pw := fl.Field().String()
+	pw = strings.TrimSpace(pw)
+
+	if len(pw) < 8 {
+		return false
+	}
+	if !reUpper.MatchString(pw) {
+		return false
+	}
+	if !reLower.MatchString(pw) {
+		return false
+	}
+	if !reDigit.MatchString(pw) {
+		return false
+	}
+	if !reSym.MatchString(pw) {
+		return false
+	}
+	if strings.Contains(pw, " ") {
+		return false
+	}
+
+	parent := fl.Parent()
+	if parent.IsValid() && parent.Kind() == reflect.Struct {
+		emailField := parent.FieldByName("Email")
+		if emailField.IsValid() && emailField.Kind() == reflect.String {
+			if email := emailField.String(); email != "" {
+				if i := strings.IndexByte(email, '@'); i > 0 {
+					local := strings.ToLower(email[:i])
+					if local != "" && strings.Contains(strings.ToLower(pw), local) {
+						return false
+					}
+				}
+			}
+		}
+	}
+	return true
+}
+
+func RequiredStrict(fl validator.FieldLevel) bool {
+	field := fl.Field()
+
+	switch field.Kind() {
+	case reflect.String:
+		return field.String() != ""
+	case reflect.Ptr:
+		return !field.IsNil()
+	}
+
+	return field.IsValid() && !field.IsZero()
+}
+
+func OmitemptyStrict(fl validator.FieldLevel) bool {
+	field := fl.Field()
+
+	if !field.IsValid() || field.IsZero() {
+		return true
+	}
+
+	if field.Kind() == reflect.String {
+		return field.String() != ""
+	}
+
+	return true
+}