Introduce entity aliases (unfinished).

services/alias.go

@@ -0,0 +1,50 @@
+package services
+
+import (
+	"errors"
+
+	"github.com/jinzhu/gorm"
+	"github.com/n1try/wakapi/models"
+)
+
+type AliasService struct {
+	Config *models.Config
+	Db     *gorm.DB
+}
+
+var userAliases map[string][]*models.Alias
+
+func (srv *AliasService) InitUser(userId string) error {
+	if userAliases == nil {
+		userAliases = make(map[string][]*models.Alias)
+	}
+
+	var aliases []*models.Alias
+	if err := srv.Db.
+		Where(&models.Alias{UserID: userId}).
+		Find(&aliases).Error; err != nil {
+		return err
+	}
+
+	userAliases[userId] = aliases
+	return nil
+}
+
+func (srv *AliasService) GetAliasOrDefault(userId string, summaryType uint8, value string) (string, error) {
+	if userAliases, ok := userAliases[userId]; ok {
+		for _, a := range userAliases {
+			if a.Type == summaryType && a.Value == value {
+				return a.Key, nil
+			}
+		}
+		return value, nil
+	}
+	return "", errors.New("User aliases not initialized")
+}
+
+func (src *AliasService) IsInitialized(userId string) bool {
+	if _, ok := userAliases[userId]; ok {
+		return true
+	}
+	return false
+}