Implement some parts for loading data from a directory

aliasuser.go

@@ -0,0 +1,48 @@
+package mailfull
+
+import "errors"
+
+// Errors for parameter.
+var (
+	ErrNotEnoughAliasUserTargets = errors.New("AliasUser: targets not enough")
+)
+
+// AliasUser represents a AliasUser.
+type AliasUser struct {
+	name    string
+	targets []string
+}
+
+// NewAliasUser creates a new AliasUser instance.
+func NewAliasUser(name string, targets []string) (*AliasUser, error) {
+	if !validAliasUserName(name) {
+		return nil, ErrInvalidAliasUserName
+	}
+
+	if len(targets) < 1 {
+		return nil, ErrNotEnoughAliasUserTargets
+	}
+
+	for _, target := range targets {
+		if !validAliasUserTarget(target) {
+			return nil, ErrInvalidAliasUserTarget
+		}
+	}
+
+	au := &AliasUser{
+		name:    name,
+		targets: targets,
+	}
+
+	return au, nil
+}
+
+// Name returns name.
+func (au *AliasUser) Name() string {
+	return au.name
+}
+
+// Targets returns targets.
+func (au *AliasUser) Targets() []string {
+	return au.targets
+}