support multi-module (#4)

* add multimodule
* re-package modules

server/internal/router/handler/order.go

@@ -0,0 +1,38 @@
+package handler
+
+import (
+	"errors"
+	"net/http"
+
+	"galaxy/model/order"
+	"galaxy/model/rest"
+
+	"github.com/gin-gonic/gin"
+	"github.com/iliadenisov/galaxy/server/internal/repo"
+)
+
+func OrderHandler(c *gin.Context, executor CommandExecutor) {
+	var cmd rest.Command
+	if errorResponse(c, c.ShouldBindJSON(&cmd)) {
+		return
+	}
+
+	commands := make([]order.DecodableCommand, len(cmd.Commands))
+	for i := range cmd.Commands {
+		command, err := repo.ParseOrder(cmd.Commands[i], validateCommand)
+		if errorResponse(c, err) {
+			return
+		}
+		commands[i] = command
+	}
+	if len(commands) == 0 {
+		errorResponse(c, errors.New("no commands given"))
+		return
+	}
+
+	if errorResponse(c, executor.ValidateOrder(cmd.Actor, commands...)) {
+		return
+	}
+
+	c.Status(http.StatusNoContent)
+}