ch8.5

internal/validator/validator.go

@@ -0,0 +1,46 @@
+package validator
+
+import (
+	"strings"
+	"unicode/utf8"
+)
+
+type Validator struct {
+	FieldErrors map[string]string
+}
+
+func (v *Validator) Valid() bool {
+	return len(v.FieldErrors) == 0
+}
+
+func (v *Validator) AddFieldError(key, message string) {
+	if v.FieldErrors == nil {
+		v.FieldErrors = make(map[string]string)
+	}
+	if _, exist := v.FieldErrors[key]; !exist {
+		v.FieldErrors[key] = message
+	}
+}
+
+func (v *Validator) CheckField(ok bool, key, message string) {
+	if !ok {
+		v.AddFieldError(key, message)
+	}
+}
+
+func NotBlank(value string) bool {
+	return strings.TrimSpace(value) != ""
+}
+
+func MaxChars(value string, n int) bool {
+	return utf8.RuneCountInString(value) <= n
+}
+
+func PermittedInt(value int, permittedValues ...int) bool {
+	for i := range permittedValues {
+		if value == permittedValues[i] {
+			return true
+		}
+	}
+	return false
+}