Move some repository related code into sub package (#19711)

* Move some repository related code into sub package

* Move more repository functions out of models

* Fix lint

* Some performance optimization for webhooks and others

* some refactors

* Fix lint

* Fix

* Update modules/repository/delete.go

Co-authored-by: delvh <dev.lh@web.de>

* Fix test

* Merge

* Fix test

* Fix test

* Fix test

* Fix test

Co-authored-by: delvh <dev.lh@web.de>

modules/repository/delete.go

@@ -0,0 +1,33 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package repository
+
+import (
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/organization"
+	repo_model "code.gitea.io/gitea/models/repo"
+	user_model "code.gitea.io/gitea/models/user"
+)
+
+// CanUserDelete returns true if user could delete the repository
+func CanUserDelete(repo *repo_model.Repository, user *user_model.User) (bool, error) {
+	if user.IsAdmin || user.ID == repo.OwnerID {
+		return true, nil
+	}
+
+	if err := repo.GetOwner(db.DefaultContext); err != nil {
+		return false, err
+	}
+
+	if repo.Owner.IsOrganization() {
+		isOwner, err := organization.OrgFromUser(repo.Owner).IsOwnedBy(user.ID)
+		if err != nil {
+			return false, err
+		}
+		return isOwner, nil
+	}
+
+	return false, nil
+}