PLT-4938 Add app package and move logic over from api package (#4931)

* Add app package and move logic over from api package

* Change app package functions to return errors

* Move non-api tests into app package

* Fix merge

app/user.go

@@ -0,0 +1,60 @@
+// Copyright (c) 2016 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package app
+
+import (
+	l4g "github.com/alecthomas/log4go"
+	"github.com/mattermost/platform/model"
+	"github.com/mattermost/platform/utils"
+)
+
+func CreateUser(user *model.User) (*model.User, *model.AppError) {
+
+	user.Roles = model.ROLE_SYSTEM_USER.Id
+
+	// Below is a special case where the first user in the entire
+	// system is granted the system_admin role
+	if result := <-Srv.Store.User().GetTotalUsersCount(); result.Err != nil {
+		return nil, result.Err
+	} else {
+		count := result.Data.(int64)
+		if count <= 0 {
+			user.Roles = model.ROLE_SYSTEM_ADMIN.Id + " " + model.ROLE_SYSTEM_USER.Id
+		}
+	}
+
+	user.MakeNonNil()
+	user.Locale = *utils.Cfg.LocalizationSettings.DefaultClientLocale
+
+	if err := utils.IsPasswordValid(user.Password); user.AuthService == "" && err != nil {
+		return nil, err
+	}
+
+	if result := <-Srv.Store.User().Save(user); result.Err != nil {
+		l4g.Error(utils.T("api.user.create_user.save.error"), result.Err)
+		return nil, result.Err
+	} else {
+		ruser := result.Data.(*model.User)
+
+		if user.EmailVerified {
+			if cresult := <-Srv.Store.User().VerifyEmail(ruser.Id); cresult.Err != nil {
+				l4g.Error(utils.T("api.user.create_user.verified.error"), cresult.Err)
+			}
+		}
+
+		pref := model.Preference{UserId: ruser.Id, Category: model.PREFERENCE_CATEGORY_TUTORIAL_STEPS, Name: ruser.Id, Value: "0"}
+		if presult := <-Srv.Store.Preference().Save(&model.Preferences{pref}); presult.Err != nil {
+			l4g.Error(utils.T("api.user.create_user.tutorial.error"), presult.Err.Message)
+		}
+
+		ruser.Sanitize(map[string]bool{})
+
+		// This message goes to everyone, so the teamId, channelId and userId are irrelevant
+		message := model.NewWebSocketEvent(model.WEBSOCKET_EVENT_NEW_USER, "", "", "", nil)
+		message.Add("user_id", ruser.Id)
+		go Publish(message)
+
+		return ruser, nil
+	}
+}