Initial commit

internal/platform/validate/validator.go

@@ -0,0 +1,67 @@
+package validate
+
+import (
+	"regexp"
+)
+
+var (
+	// EmailRX matches the email-address format accepted by Gardomatic.
+	EmailRX = regexp.MustCompile("^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$")
+	// ColorRX matches the hexadecimal RGB colors accepted for user colors.
+	ColorRX = regexp.MustCompile(`^#[0-9a-fA-F]{6}$`)
+)
+
+// Validator collects validation failures keyed by input field.
+type Validator struct {
+	Errors         map[string]string
+	NonFieldErrors []string
+	FieldErrors    map[string]string
+}
+
+// New returns an empty Validator.
+func New() *Validator {
+	return &Validator{Errors: make(map[string]string)}
+}
+
+// Valid reports whether no validation errors have been recorded.
+func (v *Validator) Valid() bool {
+	return len(v.Errors) == 0 && len(v.FieldErrors) == 0 && len(v.NonFieldErrors) == 0
+}
+
+// AddError records message for key unless key already has an error.
+func (v *Validator) AddError(key, message string) {
+	if _, exists := v.Errors[key]; !exists {
+		v.Errors[key] = message
+	}
+}
+
+// Check records message for key when ok is false.
+func (v *Validator) Check(ok bool, key, message string) {
+	if !ok {
+		v.AddError(key, message)
+	}
+}
+
+// AddNonFieldError records an error that is not associated with one field.
+func (v *Validator) AddNonFieldError(message string) {
+	v.NonFieldErrors = append(v.NonFieldErrors, message)
+}
+
+// AddFieldError records a form-specific field error.
+func (v *Validator) AddFieldError(key, message string) {
+
+	if v.FieldErrors == nil {
+		v.FieldErrors = make(map[string]string)
+	}
+
+	if _, exists := v.FieldErrors[key]; !exists {
+		v.FieldErrors[key] = message
+	}
+}
+
+// CheckField records a form-specific field error when ok is false.
+func (v *Validator) CheckField(ok bool, key, message string) {
+	if !ok {
+		v.AddFieldError(key, message)
+	}
+}