Move some functions to service layer (#26969)

services/repository/collaboration.go

@@ -0,0 +1,47 @@
+// Copyright 2016 The Gogs Authors. All rights reserved.
+// Copyright 2020 The Gitea Authors.
+// SPDX-License-Identifier: MIT
+
+package repository
+
+import (
+	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/models/db"
+	access_model "code.gitea.io/gitea/models/perm/access"
+	repo_model "code.gitea.io/gitea/models/repo"
+)
+
+// DeleteCollaboration removes collaboration relation between the user and repository.
+func DeleteCollaboration(repo *repo_model.Repository, uid int64) (err error) {
+	collaboration := &repo_model.Collaboration{
+		RepoID: repo.ID,
+		UserID: uid,
+	}
+
+	ctx, committer, err := db.TxContext(db.DefaultContext)
+	if err != nil {
+		return err
+	}
+	defer committer.Close()
+
+	if has, err := db.GetEngine(ctx).Delete(collaboration); err != nil || has == 0 {
+		return err
+	} else if err = access_model.RecalculateAccesses(ctx, repo); err != nil {
+		return err
+	}
+
+	if err = repo_model.WatchRepo(ctx, uid, repo.ID, false); err != nil {
+		return err
+	}
+
+	if err = models.ReconsiderWatches(ctx, repo, uid); err != nil {
+		return err
+	}
+
+	// Unassign a user from any issue (s)he has been assigned to in the repository
+	if err := models.ReconsiderRepoIssuesAssignee(ctx, repo, uid); err != nil {
+		return err
+	}
+
+	return committer.Commit()
+}