Move some files into models' sub packages (#20262)

* Move some files into models' sub packages

* Move functions

* merge main branch

* Fix check

* fix check

* Fix some tests

* Fix lint

* Fix lint

* Revert lint changes

* Fix error comments

* Fix lint

Co-authored-by: 6543 <6543@obermui.de>

modules/repository/collaborator.go

@@ -0,0 +1,43 @@
+// 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 (
+	"context"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/perm"
+	access_model "code.gitea.io/gitea/models/perm/access"
+	repo_model "code.gitea.io/gitea/models/repo"
+	user_model "code.gitea.io/gitea/models/user"
+)
+
+func addCollaborator(ctx context.Context, repo *repo_model.Repository, u *user_model.User) error {
+	collaboration := &repo_model.Collaboration{
+		RepoID: repo.ID,
+		UserID: u.ID,
+	}
+
+	has, err := db.GetByBean(ctx, collaboration)
+	if err != nil {
+		return err
+	} else if has {
+		return nil
+	}
+	collaboration.Mode = perm.AccessModeWrite
+
+	if err = db.Insert(ctx, collaboration); err != nil {
+		return err
+	}
+
+	return access_model.RecalculateUserAccess(ctx, repo, u.ID)
+}
+
+// AddCollaborator adds new collaboration to a repository with default access mode.
+func AddCollaborator(repo *repo_model.Repository, u *user_model.User) error {
+	return db.WithTx(func(ctx context.Context) error {
+		return addCollaborator(ctx, repo, u)
+	})
+}