Some repository refactors (#17950)

* some repository refactors

* remove unnecessary code

* Fix test

* Remove unnecessary banner

models/repo/archiver.go

@@ -107,3 +107,10 @@ func FindRepoArchives(opts FindRepoArchiversOption) ([]*RepoArchiver, error) {
 		Find(&archivers)
 	return archivers, err
 }
+
+// SetArchiveRepoState sets if a repo is archived
+func SetArchiveRepoState(repo *Repository, isArchived bool) (err error) {
+	repo.IsArchived = isArchived
+	_, err = db.GetEngine(db.DefaultContext).Where("id = ?", repo.ID).Cols("is_archived").NoAutoTime().Update(repo)
+	return
+}

models/repo/fork.go

@@ -0,0 +1,69 @@
+// Copyright 2021 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 repo
+
+import (
+	"context"
+
+	"code.gitea.io/gitea/models/db"
+)
+
+func getRepositoriesByForkID(e db.Engine, forkID int64) ([]*Repository, error) {
+	repos := make([]*Repository, 0, 10)
+	return repos, e.
+		Where("fork_id=?", forkID).
+		Find(&repos)
+}
+
+// GetRepositoriesByForkID returns all repositories with given fork ID.
+func GetRepositoriesByForkID(ctx context.Context, forkID int64) ([]*Repository, error) {
+	return getRepositoriesByForkID(db.GetEngine(ctx), forkID)
+}
+
+// GetForkedRepo checks if given user has already forked a repository with given ID.
+func GetForkedRepo(ownerID, repoID int64) *Repository {
+	repo := new(Repository)
+	has, _ := db.GetEngine(db.DefaultContext).
+		Where("owner_id=? AND fork_id=?", ownerID, repoID).
+		Get(repo)
+	if has {
+		return repo
+	}
+	return nil
+}
+
+// HasForkedRepo checks if given user has already forked a repository with given ID.
+func HasForkedRepo(ownerID, repoID int64) bool {
+	has, _ := db.GetEngine(db.DefaultContext).
+		Table("repository").
+		Where("owner_id=? AND fork_id=?", ownerID, repoID).
+		Exist()
+	return has
+}
+
+// GetUserFork return user forked repository from this repository, if not forked return nil
+func GetUserFork(repoID, userID int64) (*Repository, error) {
+	var forkedRepo Repository
+	has, err := db.GetEngine(db.DefaultContext).Where("fork_id = ?", repoID).And("owner_id = ?", userID).Get(&forkedRepo)
+	if err != nil {
+		return nil, err
+	}
+	if !has {
+		return nil, nil
+	}
+	return &forkedRepo, nil
+}
+
+// GetForks returns all the forks of the repository
+func GetForks(repo *Repository, listOptions db.ListOptions) ([]*Repository, error) {
+	if listOptions.Page == 0 {
+		forks := make([]*Repository, 0, repo.NumForks)
+		return forks, db.GetEngine(db.DefaultContext).Find(&forks, &Repository{ForkID: repo.ID})
+	}
+
+	sess := db.GetPaginatedSession(&listOptions)
+	forks := make([]*Repository, 0, listOptions.PageSize)
+	return forks, sess.Find(&forks, &Repository{ForkID: repo.ID})
+}

models/repo/fork_test.go

@@ -0,0 +1,32 @@
+// Copyright 2021 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 repo
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models/unittest"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGetUserFork(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	// User13 has repo 11 forked from repo10
+	repo, err := GetRepositoryByID(10)
+	assert.NoError(t, err)
+	assert.NotNil(t, repo)
+	repo, err = GetUserFork(repo.ID, 13)
+	assert.NoError(t, err)
+	assert.NotNil(t, repo)
+
+	repo, err = GetRepositoryByID(9)
+	assert.NoError(t, err)
+	assert.NotNil(t, repo)
+	repo, err = GetUserFork(repo.ID, 13)
+	assert.NoError(t, err)
+	assert.Nil(t, repo)
+}

models/repo/main_test.go

@@ -18,5 +18,11 @@ func TestMain(m *testing.M) {
 		"repository.yml",
 		"repo_unit.yml",
 		"repo_indexer_status.yml",
+		"repo_redirect.yml",
+		"watch.yml",
+		"star.yml",
+		"topic.yml",
+		"repo_topic.yml",
+		"user.yml",
 	)
 }

models/repo/redirect.go

@@ -0,0 +1,82 @@
+// Copyright 2017 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 repo
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"code.gitea.io/gitea/models/db"
+)
+
+// ErrRedirectNotExist represents a "RedirectNotExist" kind of error.
+type ErrRedirectNotExist struct {
+	OwnerID  int64
+	RepoName string
+}
+
+// IsErrRedirectNotExist check if an error is an ErrRepoRedirectNotExist.
+func IsErrRedirectNotExist(err error) bool {
+	_, ok := err.(ErrRedirectNotExist)
+	return ok
+}
+
+func (err ErrRedirectNotExist) Error() string {
+	return fmt.Sprintf("repository redirect does not exist [uid: %d, name: %s]", err.OwnerID, err.RepoName)
+}
+
+// Redirect represents that a repo name should be redirected to another
+type Redirect struct {
+	ID             int64  `xorm:"pk autoincr"`
+	OwnerID        int64  `xorm:"UNIQUE(s)"`
+	LowerName      string `xorm:"UNIQUE(s) INDEX NOT NULL"`
+	RedirectRepoID int64  // repoID to redirect to
+}
+
+// TableName represents real table name in database
+func (Redirect) TableName() string {
+	return "repo_redirect"
+}
+
+func init() {
+	db.RegisterModel(new(Redirect))
+}
+
+// LookupRedirect look up if a repository has a redirect name
+func LookupRedirect(ownerID int64, repoName string) (int64, error) {
+	repoName = strings.ToLower(repoName)
+	redirect := &Redirect{OwnerID: ownerID, LowerName: repoName}
+	if has, err := db.GetEngine(db.DefaultContext).Get(redirect); err != nil {
+		return 0, err
+	} else if !has {
+		return 0, ErrRedirectNotExist{OwnerID: ownerID, RepoName: repoName}
+	}
+	return redirect.RedirectRepoID, nil
+}
+
+// NewRedirect create a new repo redirect
+func NewRedirect(ctx context.Context, ownerID, repoID int64, oldRepoName, newRepoName string) error {
+	oldRepoName = strings.ToLower(oldRepoName)
+	newRepoName = strings.ToLower(newRepoName)
+
+	if err := DeleteRedirect(ctx, ownerID, newRepoName); err != nil {
+		return err
+	}
+
+	return db.Insert(ctx, &Redirect{
+		OwnerID:        ownerID,
+		LowerName:      oldRepoName,
+		RedirectRepoID: repoID,
+	})
+}
+
+// DeleteRedirect delete any redirect from the specified repo name to
+// anything else
+func DeleteRedirect(ctx context.Context, ownerID int64, repoName string) error {
+	repoName = strings.ToLower(repoName)
+	_, err := db.GetEngine(ctx).Delete(&Redirect{OwnerID: ownerID, LowerName: repoName})
+	return err
+}

models/repo/redirect_test.go

@@ -0,0 +1,77 @@
+// Copyright 2017 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 repo
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/unittest"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestLookupRedirect(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	repoID, err := LookupRedirect(2, "oldrepo1")
+	assert.NoError(t, err)
+	assert.EqualValues(t, 1, repoID)
+
+	_, err = LookupRedirect(unittest.NonexistentID, "doesnotexist")
+	assert.True(t, IsErrRedirectNotExist(err))
+}
+
+func TestNewRedirect(t *testing.T) {
+	// redirect to a completely new name
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	repo := unittest.AssertExistsAndLoadBean(t, &Repository{ID: 1}).(*Repository)
+	assert.NoError(t, NewRedirect(db.DefaultContext, repo.OwnerID, repo.ID, repo.Name, "newreponame"))
+
+	unittest.AssertExistsAndLoadBean(t, &Redirect{
+		OwnerID:        repo.OwnerID,
+		LowerName:      repo.LowerName,
+		RedirectRepoID: repo.ID,
+	})
+	unittest.AssertExistsAndLoadBean(t, &Redirect{
+		OwnerID:        repo.OwnerID,
+		LowerName:      "oldrepo1",
+		RedirectRepoID: repo.ID,
+	})
+}
+
+func TestNewRedirect2(t *testing.T) {
+	// redirect to previously used name
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	repo := unittest.AssertExistsAndLoadBean(t, &Repository{ID: 1}).(*Repository)
+	assert.NoError(t, NewRedirect(db.DefaultContext, repo.OwnerID, repo.ID, repo.Name, "oldrepo1"))
+
+	unittest.AssertExistsAndLoadBean(t, &Redirect{
+		OwnerID:        repo.OwnerID,
+		LowerName:      repo.LowerName,
+		RedirectRepoID: repo.ID,
+	})
+	unittest.AssertNotExistsBean(t, &Redirect{
+		OwnerID:        repo.OwnerID,
+		LowerName:      "oldrepo1",
+		RedirectRepoID: repo.ID,
+	})
+}
+
+func TestNewRedirect3(t *testing.T) {
+	// redirect for a previously-unredirected repo
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	repo := unittest.AssertExistsAndLoadBean(t, &Repository{ID: 2}).(*Repository)
+	assert.NoError(t, NewRedirect(db.DefaultContext, repo.OwnerID, repo.ID, repo.Name, "newreponame"))
+
+	unittest.AssertExistsAndLoadBean(t, &Redirect{
+		OwnerID:        repo.OwnerID,
+		LowerName:      repo.LowerName,
+		RedirectRepoID: repo.ID,
+	})
+}

models/repo/repo.go

@@ -25,6 +25,20 @@ import (
 	"code.gitea.io/gitea/modules/util"
 )
 
+var (
+	reservedRepoNames    = []string{".", ".."}
+	reservedRepoPatterns = []string{"*.git", "*.wiki", "*.rss", "*.atom"}
+)
+
+// IsUsableRepoName returns true when repository is usable
+func IsUsableRepoName(name string) error {
+	if db.AlphaDashDotPattern.MatchString(name) {
+		// Note: usually this error is normally caught up earlier in the UI
+		return db.ErrNameCharsNotAllowed{Name: name}
+	}
+	return db.IsUsableName(reservedRepoNames, reservedRepoPatterns, name)
+}
+
 // TrustModelType defines the types of trust model for this repository
 type TrustModelType int
 
@@ -734,3 +748,25 @@ func GetPublicRepositoryCount(u *user_model.User) (int64, error) {
 func GetPrivateRepositoryCount(u *user_model.User) (int64, error) {
 	return getPrivateRepositoryCount(db.GetEngine(db.DefaultContext), u)
 }
+
+// IterateRepository iterate repositories
+func IterateRepository(f func(repo *Repository) error) error {
+	var start int
+	batchSize := setting.Database.IterateBufferSize
+	for {
+		repos := make([]*Repository, 0, batchSize)
+		if err := db.GetEngine(db.DefaultContext).Limit(batchSize, start).Find(&repos); err != nil {
+			return err
+		}
+		if len(repos) == 0 {
+			return nil
+		}
+		start += len(repos)
+
+		for _, repo := range repos {
+			if err := f(repo); err != nil {
+				return err
+			}
+		}
+	}
+}

models/repo/repo_test.go

@@ -42,3 +42,10 @@ func TestGetPrivateRepositoryCount(t *testing.T) {
 	assert.NoError(t, err)
 	assert.Equal(t, int64(2), count)
 }
+
+func TestRepoAPIURL(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	repo := unittest.AssertExistsAndLoadBean(t, &Repository{ID: 10}).(*Repository)
+
+	assert.Equal(t, "https://try.gitea.io/api/v1/repos/user12/repo10", repo.APIURL())
+}

models/repo/repo_unit.go

@@ -242,3 +242,29 @@ func UpdateRepoUnit(unit *RepoUnit) error {
 	_, err := db.GetEngine(db.DefaultContext).ID(unit.ID).Update(unit)
 	return err
 }
+
+// UpdateRepositoryUnits updates a repository's units
+func UpdateRepositoryUnits(repo *Repository, units []RepoUnit, deleteUnitTypes []unit.Type) (err error) {
+	ctx, committer, err := db.TxContext()
+	if err != nil {
+		return err
+	}
+	defer committer.Close()
+
+	// Delete existing settings of units before adding again
+	for _, u := range units {
+		deleteUnitTypes = append(deleteUnitTypes, u.Type)
+	}
+
+	if _, err = db.GetEngine(ctx).Where("repo_id = ?", repo.ID).In("type", deleteUnitTypes).Delete(new(RepoUnit)); err != nil {
+		return err
+	}
+
+	if len(units) > 0 {
+		if err = db.Insert(ctx, units); err != nil {
+			return err
+		}
+	}
+
+	return committer.Commit()
+}

models/repo/star.go

@@ -0,0 +1,90 @@
+// Copyright 2016 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 repo
+
+import (
+	"code.gitea.io/gitea/models/db"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/timeutil"
+)
+
+// Star represents a starred repo by an user.
+type Star struct {
+	ID          int64              `xorm:"pk autoincr"`
+	UID         int64              `xorm:"UNIQUE(s)"`
+	RepoID      int64              `xorm:"UNIQUE(s)"`
+	CreatedUnix timeutil.TimeStamp `xorm:"INDEX created"`
+}
+
+func init() {
+	db.RegisterModel(new(Star))
+}
+
+// StarRepo or unstar repository.
+func StarRepo(userID, repoID int64, star bool) error {
+	ctx, committer, err := db.TxContext()
+	if err != nil {
+		return err
+	}
+	defer committer.Close()
+	staring := isStaring(db.GetEngine(ctx), userID, repoID)
+
+	if star {
+		if staring {
+			return nil
+		}
+
+		if err := db.Insert(ctx, &Star{UID: userID, RepoID: repoID}); err != nil {
+			return err
+		}
+		if _, err := db.Exec(ctx, "UPDATE `repository` SET num_stars = num_stars + 1 WHERE id = ?", repoID); err != nil {
+			return err
+		}
+		if _, err := db.Exec(ctx, "UPDATE `user` SET num_stars = num_stars + 1 WHERE id = ?", userID); err != nil {
+			return err
+		}
+	} else {
+		if !staring {
+			return nil
+		}
+
+		if _, err := db.DeleteByBean(ctx, &Star{UID: userID, RepoID: repoID}); err != nil {
+			return err
+		}
+		if _, err := db.Exec(ctx, "UPDATE `repository` SET num_stars = num_stars - 1 WHERE id = ?", repoID); err != nil {
+			return err
+		}
+		if _, err := db.Exec(ctx, "UPDATE `user` SET num_stars = num_stars - 1 WHERE id = ?", userID); err != nil {
+			return err
+		}
+	}
+
+	return committer.Commit()
+}
+
+// IsStaring checks if user has starred given repository.
+func IsStaring(userID, repoID int64) bool {
+	return isStaring(db.GetEngine(db.DefaultContext), userID, repoID)
+}
+
+func isStaring(e db.Engine, userID, repoID int64) bool {
+	has, _ := e.Get(&Star{UID: userID, RepoID: repoID})
+	return has
+}
+
+// GetStargazers returns the users that starred the repo.
+func GetStargazers(repo *Repository, opts db.ListOptions) ([]*user_model.User, error) {
+	sess := db.GetEngine(db.DefaultContext).Where("star.repo_id = ?", repo.ID).
+		Join("LEFT", "star", "`user`.id = star.uid")
+	if opts.Page > 0 {
+		sess = db.SetSessionPagination(sess, &opts)
+
+		users := make([]*user_model.User, 0, opts.PageSize)
+		return users, sess.Find(&users)
+	}
+
+	users := make([]*user_model.User, 0, 8)
+	return users, sess.Find(&users)
+}

models/repo/star_test.go

@@ -0,0 +1,53 @@
+// Copyright 2017 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 repo
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/unittest"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestStarRepo(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	const userID = 2
+	const repoID = 1
+	unittest.AssertNotExistsBean(t, &Star{UID: userID, RepoID: repoID})
+	assert.NoError(t, StarRepo(userID, repoID, true))
+	unittest.AssertExistsAndLoadBean(t, &Star{UID: userID, RepoID: repoID})
+	assert.NoError(t, StarRepo(userID, repoID, true))
+	unittest.AssertExistsAndLoadBean(t, &Star{UID: userID, RepoID: repoID})
+	assert.NoError(t, StarRepo(userID, repoID, false))
+	unittest.AssertNotExistsBean(t, &Star{UID: userID, RepoID: repoID})
+}
+
+func TestIsStaring(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	assert.True(t, IsStaring(2, 4))
+	assert.False(t, IsStaring(3, 4))
+}
+
+func TestRepository_GetStargazers(t *testing.T) {
+	// repo with stargazers
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	repo := unittest.AssertExistsAndLoadBean(t, &Repository{ID: 4}).(*Repository)
+	gazers, err := GetStargazers(repo, db.ListOptions{Page: 0})
+	assert.NoError(t, err)
+	if assert.Len(t, gazers, 1) {
+		assert.Equal(t, int64(2), gazers[0].ID)
+	}
+}
+
+func TestRepository_GetStargazers2(t *testing.T) {
+	// repo with stargazers
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	repo := unittest.AssertExistsAndLoadBean(t, &Repository{ID: 3}).(*Repository)
+	gazers, err := GetStargazers(repo, db.ListOptions{Page: 0})
+	assert.NoError(t, err)
+	assert.Len(t, gazers, 0)
+}

models/repo/topic.go

@@ -0,0 +1,369 @@
+// Copyright 2018 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 repo
+
+import (
+	"context"
+	"fmt"
+	"regexp"
+	"strings"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/modules/timeutil"
+
+	"xorm.io/builder"
+)
+
+func init() {
+	db.RegisterModel(new(Topic))
+	db.RegisterModel(new(RepoTopic))
+}
+
+var topicPattern = regexp.MustCompile(`^[a-z0-9][a-z0-9-]*$`)
+
+// Topic represents a topic of repositories
+type Topic struct {
+	ID          int64  `xorm:"pk autoincr"`
+	Name        string `xorm:"UNIQUE VARCHAR(50)"`
+	RepoCount   int
+	CreatedUnix timeutil.TimeStamp `xorm:"INDEX created"`
+	UpdatedUnix timeutil.TimeStamp `xorm:"INDEX updated"`
+}
+
+// RepoTopic represents associated repositories and topics
+type RepoTopic struct { //revive:disable-line:exported
+	RepoID  int64 `xorm:"pk"`
+	TopicID int64 `xorm:"pk"`
+}
+
+// ErrTopicNotExist represents an error that a topic is not exist
+type ErrTopicNotExist struct {
+	Name string
+}
+
+// IsErrTopicNotExist checks if an error is an ErrTopicNotExist.
+func IsErrTopicNotExist(err error) bool {
+	_, ok := err.(ErrTopicNotExist)
+	return ok
+}
+
+// Error implements error interface
+func (err ErrTopicNotExist) Error() string {
+	return fmt.Sprintf("topic is not exist [name: %s]", err.Name)
+}
+
+// ValidateTopic checks a topic by length and match pattern rules
+func ValidateTopic(topic string) bool {
+	return len(topic) <= 35 && topicPattern.MatchString(topic)
+}
+
+// SanitizeAndValidateTopics sanitizes and checks an array or topics
+func SanitizeAndValidateTopics(topics []string) (validTopics, invalidTopics []string) {
+	validTopics = make([]string, 0)
+	mValidTopics := make(map[string]struct{})
+	invalidTopics = make([]string, 0)
+
+	for _, topic := range topics {
+		topic = strings.TrimSpace(strings.ToLower(topic))
+		// ignore empty string
+		if len(topic) == 0 {
+			continue
+		}
+		// ignore same topic twice
+		if _, ok := mValidTopics[topic]; ok {
+			continue
+		}
+		if ValidateTopic(topic) {
+			validTopics = append(validTopics, topic)
+			mValidTopics[topic] = struct{}{}
+		} else {
+			invalidTopics = append(invalidTopics, topic)
+		}
+	}
+
+	return validTopics, invalidTopics
+}
+
+// GetTopicByName retrieves topic by name
+func GetTopicByName(name string) (*Topic, error) {
+	var topic Topic
+	if has, err := db.GetEngine(db.DefaultContext).Where("name = ?", name).Get(&topic); err != nil {
+		return nil, err
+	} else if !has {
+		return nil, ErrTopicNotExist{name}
+	}
+	return &topic, nil
+}
+
+// addTopicByNameToRepo adds a topic name to a repo and increments the topic count.
+// Returns topic after the addition
+func addTopicByNameToRepo(e db.Engine, repoID int64, topicName string) (*Topic, error) {
+	var topic Topic
+	has, err := e.Where("name = ?", topicName).Get(&topic)
+	if err != nil {
+		return nil, err
+	}
+	if !has {
+		topic.Name = topicName
+		topic.RepoCount = 1
+		if _, err := e.Insert(&topic); err != nil {
+			return nil, err
+		}
+	} else {
+		topic.RepoCount++
+		if _, err := e.ID(topic.ID).Cols("repo_count").Update(&topic); err != nil {
+			return nil, err
+		}
+	}
+
+	if _, err := e.Insert(&RepoTopic{
+		RepoID:  repoID,
+		TopicID: topic.ID,
+	}); err != nil {
+		return nil, err
+	}
+
+	return &topic, nil
+}
+
+// removeTopicFromRepo remove a topic from a repo and decrements the topic repo count
+func removeTopicFromRepo(e db.Engine, repoID int64, topic *Topic) error {
+	topic.RepoCount--
+	if _, err := e.ID(topic.ID).Cols("repo_count").Update(topic); err != nil {
+		return err
+	}
+
+	if _, err := e.Delete(&RepoTopic{
+		RepoID:  repoID,
+		TopicID: topic.ID,
+	}); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// RemoveTopicsFromRepo remove all topics from the repo and decrements respective topics repo count
+func RemoveTopicsFromRepo(ctx context.Context, repoID int64) error {
+	e := db.GetEngine(ctx)
+	_, err := e.Where(
+		builder.In("id",
+			builder.Select("topic_id").From("repo_topic").Where(builder.Eq{"repo_id": repoID}),
+		),
+	).Cols("repo_count").SetExpr("repo_count", "repo_count-1").Update(&Topic{})
+	if err != nil {
+		return err
+	}
+
+	if _, err = e.Delete(&RepoTopic{RepoID: repoID}); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// FindTopicOptions represents the options when fdin topics
+type FindTopicOptions struct {
+	db.ListOptions
+	RepoID  int64
+	Keyword string
+}
+
+func (opts *FindTopicOptions) toConds() builder.Cond {
+	cond := builder.NewCond()
+	if opts.RepoID > 0 {
+		cond = cond.And(builder.Eq{"repo_topic.repo_id": opts.RepoID})
+	}
+
+	if opts.Keyword != "" {
+		cond = cond.And(builder.Like{"topic.name", opts.Keyword})
+	}
+
+	return cond
+}
+
+// FindTopics retrieves the topics via FindTopicOptions
+func FindTopics(opts *FindTopicOptions) ([]*Topic, int64, error) {
+	sess := db.GetEngine(db.DefaultContext).Select("topic.*").Where(opts.toConds())
+	if opts.RepoID > 0 {
+		sess.Join("INNER", "repo_topic", "repo_topic.topic_id = topic.id")
+	}
+	if opts.PageSize != 0 && opts.Page != 0 {
+		sess = db.SetSessionPagination(sess, opts)
+	}
+	topics := make([]*Topic, 0, 10)
+	total, err := sess.Desc("topic.repo_count").FindAndCount(&topics)
+	return topics, total, err
+}
+
+// CountTopics counts the number of topics matching the FindTopicOptions
+func CountTopics(opts *FindTopicOptions) (int64, error) {
+	sess := db.GetEngine(db.DefaultContext).Where(opts.toConds())
+	if opts.RepoID > 0 {
+		sess.Join("INNER", "repo_topic", "repo_topic.topic_id = topic.id")
+	}
+	return sess.Count(new(Topic))
+}
+
+// GetRepoTopicByName retrieves topic from name for a repo if it exist
+func GetRepoTopicByName(repoID int64, topicName string) (*Topic, error) {
+	return getRepoTopicByName(db.GetEngine(db.DefaultContext), repoID, topicName)
+}
+
+func getRepoTopicByName(e db.Engine, repoID int64, topicName string) (*Topic, error) {
+	cond := builder.NewCond()
+	var topic Topic
+	cond = cond.And(builder.Eq{"repo_topic.repo_id": repoID}).And(builder.Eq{"topic.name": topicName})
+	sess := e.Table("topic").Where(cond)
+	sess.Join("INNER", "repo_topic", "repo_topic.topic_id = topic.id")
+	has, err := sess.Get(&topic)
+	if has {
+		return &topic, err
+	}
+	return nil, err
+}
+
+// AddTopic adds a topic name to a repository (if it does not already have it)
+func AddTopic(repoID int64, topicName string) (*Topic, error) {
+	ctx, committer, err := db.TxContext()
+	if err != nil {
+		return nil, err
+	}
+	defer committer.Close()
+	sess := db.GetEngine(ctx)
+
+	topic, err := getRepoTopicByName(sess, repoID, topicName)
+	if err != nil {
+		return nil, err
+	}
+	if topic != nil {
+		// Repo already have topic
+		return topic, nil
+	}
+
+	topic, err = addTopicByNameToRepo(sess, repoID, topicName)
+	if err != nil {
+		return nil, err
+	}
+
+	topicNames := make([]string, 0, 25)
+	if err := sess.Select("name").Table("topic").
+		Join("INNER", "repo_topic", "repo_topic.topic_id = topic.id").
+		Where("repo_topic.repo_id = ?", repoID).Desc("topic.repo_count").Find(&topicNames); err != nil {
+		return nil, err
+	}
+
+	if _, err := sess.ID(repoID).Cols("topics").Update(&Repository{
+		Topics: topicNames,
+	}); err != nil {
+		return nil, err
+	}
+
+	return topic, committer.Commit()
+}
+
+// DeleteTopic removes a topic name from a repository (if it has it)
+func DeleteTopic(repoID int64, topicName string) (*Topic, error) {
+	topic, err := GetRepoTopicByName(repoID, topicName)
+	if err != nil {
+		return nil, err
+	}
+	if topic == nil {
+		// Repo doesn't have topic, can't be removed
+		return nil, nil
+	}
+
+	err = removeTopicFromRepo(db.GetEngine(db.DefaultContext), repoID, topic)
+
+	return topic, err
+}
+
+// SaveTopics save topics to a repository
+func SaveTopics(repoID int64, topicNames ...string) error {
+	topics, _, err := FindTopics(&FindTopicOptions{
+		RepoID: repoID,
+	})
+	if err != nil {
+		return err
+	}
+
+	ctx, committer, err := db.TxContext()
+	if err != nil {
+		return err
+	}
+	defer committer.Close()
+	sess := db.GetEngine(ctx)
+
+	var addedTopicNames []string
+	for _, topicName := range topicNames {
+		if strings.TrimSpace(topicName) == "" {
+			continue
+		}
+
+		var found bool
+		for _, t := range topics {
+			if strings.EqualFold(topicName, t.Name) {
+				found = true
+				break
+			}
+		}
+		if !found {
+			addedTopicNames = append(addedTopicNames, topicName)
+		}
+	}
+
+	var removeTopics []*Topic
+	for _, t := range topics {
+		var found bool
+		for _, topicName := range topicNames {
+			if strings.EqualFold(topicName, t.Name) {
+				found = true
+				break
+			}
+		}
+		if !found {
+			removeTopics = append(removeTopics, t)
+		}
+	}
+
+	for _, topicName := range addedTopicNames {
+		_, err := addTopicByNameToRepo(sess, repoID, topicName)
+		if err != nil {
+			return err
+		}
+	}
+
+	for _, topic := range removeTopics {
+		err := removeTopicFromRepo(sess, repoID, topic)
+		if err != nil {
+			return err
+		}
+	}
+
+	topicNames = make([]string, 0, 25)
+	if err := sess.Table("topic").Cols("name").
+		Join("INNER", "repo_topic", "repo_topic.topic_id = topic.id").
+		Where("repo_topic.repo_id = ?", repoID).Desc("topic.repo_count").Find(&topicNames); err != nil {
+		return err
+	}
+
+	if _, err := sess.ID(repoID).Cols("topics").Update(&Repository{
+		Topics: topicNames,
+	}); err != nil {
+		return err
+	}
+
+	return committer.Commit()
+}
+
+// GenerateTopics generates topics from a template repository
+func GenerateTopics(ctx context.Context, templateRepo, generateRepo *Repository) error {
+	for _, topic := range templateRepo.Topics {
+		if _, err := addTopicByNameToRepo(db.GetEngine(ctx), generateRepo.ID, topic); err != nil {
+			return err
+		}
+	}
+	return nil
+}

models/repo/topic_test.go

@@ -0,0 +1,80 @@
+// Copyright 2018 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 repo
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/unittest"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestAddTopic(t *testing.T) {
+	totalNrOfTopics := 6
+	repo1NrOfTopics := 3
+
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	topics, _, err := FindTopics(&FindTopicOptions{})
+	assert.NoError(t, err)
+	assert.Len(t, topics, totalNrOfTopics)
+
+	topics, total, err := FindTopics(&FindTopicOptions{
+		ListOptions: db.ListOptions{Page: 1, PageSize: 2},
+	})
+	assert.NoError(t, err)
+	assert.Len(t, topics, 2)
+	assert.EqualValues(t, 6, total)
+
+	topics, _, err = FindTopics(&FindTopicOptions{
+		RepoID: 1,
+	})
+	assert.NoError(t, err)
+	assert.Len(t, topics, repo1NrOfTopics)
+
+	assert.NoError(t, SaveTopics(2, "golang"))
+	repo2NrOfTopics := 1
+	topics, _, err = FindTopics(&FindTopicOptions{})
+	assert.NoError(t, err)
+	assert.Len(t, topics, totalNrOfTopics)
+
+	topics, _, err = FindTopics(&FindTopicOptions{
+		RepoID: 2,
+	})
+	assert.NoError(t, err)
+	assert.Len(t, topics, repo2NrOfTopics)
+
+	assert.NoError(t, SaveTopics(2, "golang", "gitea"))
+	repo2NrOfTopics = 2
+	totalNrOfTopics++
+	topic, err := GetTopicByName("gitea")
+	assert.NoError(t, err)
+	assert.EqualValues(t, 1, topic.RepoCount)
+
+	topics, _, err = FindTopics(&FindTopicOptions{})
+	assert.NoError(t, err)
+	assert.Len(t, topics, totalNrOfTopics)
+
+	topics, _, err = FindTopics(&FindTopicOptions{
+		RepoID: 2,
+	})
+	assert.NoError(t, err)
+	assert.Len(t, topics, repo2NrOfTopics)
+}
+
+func TestTopicValidator(t *testing.T) {
+	assert.True(t, ValidateTopic("12345"))
+	assert.True(t, ValidateTopic("2-test"))
+	assert.True(t, ValidateTopic("test-3"))
+	assert.True(t, ValidateTopic("first"))
+	assert.True(t, ValidateTopic("second-test-topic"))
+	assert.True(t, ValidateTopic("third-project-topic-with-max-length"))
+
+	assert.False(t, ValidateTopic("$fourth-test,topic"))
+	assert.False(t, ValidateTopic("-fifth-test-topic"))
+	assert.False(t, ValidateTopic("sixth-go-project-topic-with-excess-length"))
+}

models/repo/update.go

@@ -0,0 +1,179 @@
+// Copyright 2021 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 repo
+
+import (
+	"context"
+	"fmt"
+	"strings"
+	"time"
+
+	"code.gitea.io/gitea/models/db"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/util"
+)
+
+// UpdateRepositoryOwnerNames updates repository owner_names (this should only be used when the ownerName has changed case)
+func UpdateRepositoryOwnerNames(ownerID int64, ownerName string) error {
+	if ownerID == 0 {
+		return nil
+	}
+	ctx, committer, err := db.TxContext()
+	if err != nil {
+		return err
+	}
+	defer committer.Close()
+
+	if _, err := db.GetEngine(ctx).Where("owner_id = ?", ownerID).Cols("owner_name").Update(&Repository{
+		OwnerName: ownerName,
+	}); err != nil {
+		return err
+	}
+
+	return committer.Commit()
+}
+
+// UpdateRepositoryUpdatedTime updates a repository's updated time
+func UpdateRepositoryUpdatedTime(repoID int64, updateTime time.Time) error {
+	_, err := db.GetEngine(db.DefaultContext).Exec("UPDATE repository SET updated_unix = ? WHERE id = ?", updateTime.Unix(), repoID)
+	return err
+}
+
+// UpdateRepositoryColsCtx updates repository's columns
+func UpdateRepositoryColsCtx(ctx context.Context, repo *Repository, cols ...string) error {
+	_, err := db.GetEngine(ctx).ID(repo.ID).Cols(cols...).Update(repo)
+	return err
+}
+
+// UpdateRepositoryCols updates repository's columns
+func UpdateRepositoryCols(repo *Repository, cols ...string) error {
+	return UpdateRepositoryColsCtx(db.DefaultContext, repo, cols...)
+}
+
+// ErrReachLimitOfRepo represents a "ReachLimitOfRepo" kind of error.
+type ErrReachLimitOfRepo struct {
+	Limit int
+}
+
+// IsErrReachLimitOfRepo checks if an error is a ErrReachLimitOfRepo.
+func IsErrReachLimitOfRepo(err error) bool {
+	_, ok := err.(ErrReachLimitOfRepo)
+	return ok
+}
+
+func (err ErrReachLimitOfRepo) Error() string {
+	return fmt.Sprintf("user has reached maximum limit of repositories [limit: %d]", err.Limit)
+}
+
+// ErrRepoAlreadyExist represents a "RepoAlreadyExist" kind of error.
+type ErrRepoAlreadyExist struct {
+	Uname string
+	Name  string
+}
+
+// IsErrRepoAlreadyExist checks if an error is a ErrRepoAlreadyExist.
+func IsErrRepoAlreadyExist(err error) bool {
+	_, ok := err.(ErrRepoAlreadyExist)
+	return ok
+}
+
+func (err ErrRepoAlreadyExist) Error() string {
+	return fmt.Sprintf("repository already exists [uname: %s, name: %s]", err.Uname, err.Name)
+}
+
+// ErrRepoFilesAlreadyExist represents a "RepoFilesAlreadyExist" kind of error.
+type ErrRepoFilesAlreadyExist struct {
+	Uname string
+	Name  string
+}
+
+// IsErrRepoFilesAlreadyExist checks if an error is a ErrRepoAlreadyExist.
+func IsErrRepoFilesAlreadyExist(err error) bool {
+	_, ok := err.(ErrRepoFilesAlreadyExist)
+	return ok
+}
+
+func (err ErrRepoFilesAlreadyExist) Error() string {
+	return fmt.Sprintf("repository files already exist [uname: %s, name: %s]", err.Uname, err.Name)
+}
+
+// CheckCreateRepository check if could created a repository
+func CheckCreateRepository(doer, u *user_model.User, name string, overwriteOrAdopt bool) error {
+	if !doer.CanCreateRepo() {
+		return ErrReachLimitOfRepo{u.MaxRepoCreation}
+	}
+
+	if err := IsUsableRepoName(name); err != nil {
+		return err
+	}
+
+	has, err := IsRepositoryExist(u, name)
+	if err != nil {
+		return fmt.Errorf("IsRepositoryExist: %v", err)
+	} else if has {
+		return ErrRepoAlreadyExist{u.Name, name}
+	}
+
+	repoPath := RepoPath(u.Name, name)
+	isExist, err := util.IsExist(repoPath)
+	if err != nil {
+		log.Error("Unable to check if %s exists. Error: %v", repoPath, err)
+		return err
+	}
+	if !overwriteOrAdopt && isExist {
+		return ErrRepoFilesAlreadyExist{u.Name, name}
+	}
+	return nil
+}
+
+// ChangeRepositoryName changes all corresponding setting from old repository name to new one.
+func ChangeRepositoryName(doer *user_model.User, repo *Repository, newRepoName string) (err error) {
+	oldRepoName := repo.Name
+	newRepoName = strings.ToLower(newRepoName)
+	if err = IsUsableRepoName(newRepoName); err != nil {
+		return err
+	}
+
+	if err := repo.GetOwner(db.DefaultContext); err != nil {
+		return err
+	}
+
+	has, err := IsRepositoryExist(repo.Owner, newRepoName)
+	if err != nil {
+		return fmt.Errorf("IsRepositoryExist: %v", err)
+	} else if has {
+		return ErrRepoAlreadyExist{repo.Owner.Name, newRepoName}
+	}
+
+	newRepoPath := RepoPath(repo.Owner.Name, newRepoName)
+	if err = util.Rename(repo.RepoPath(), newRepoPath); err != nil {
+		return fmt.Errorf("rename repository directory: %v", err)
+	}
+
+	wikiPath := repo.WikiPath()
+	isExist, err := util.IsExist(wikiPath)
+	if err != nil {
+		log.Error("Unable to check if %s exists. Error: %v", wikiPath, err)
+		return err
+	}
+	if isExist {
+		if err = util.Rename(wikiPath, WikiPath(repo.Owner.Name, newRepoName)); err != nil {
+			return fmt.Errorf("rename repository wiki: %v", err)
+		}
+	}
+
+	ctx, committer, err := db.TxContext()
+	if err != nil {
+		return err
+	}
+	defer committer.Close()
+
+	if err := NewRedirect(ctx, repo.Owner.ID, repo.ID, oldRepoName, newRepoName); err != nil {
+		return err
+	}
+
+	return committer.Commit()
+}

models/repo/watch.go

@@ -0,0 +1,196 @@
+// Copyright 2017 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 repo
+
+import (
+	"context"
+
+	"code.gitea.io/gitea/models/db"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/timeutil"
+)
+
+// WatchMode specifies what kind of watch the user has on a repository
+type WatchMode int8
+
+const (
+	// WatchModeNone don't watch
+	WatchModeNone WatchMode = iota // 0
+	// WatchModeNormal watch repository (from other sources)
+	WatchModeNormal // 1
+	// WatchModeDont explicit don't auto-watch
+	WatchModeDont // 2
+	// WatchModeAuto watch repository (from AutoWatchOnChanges)
+	WatchModeAuto // 3
+)
+
+// Watch is connection request for receiving repository notification.
+type Watch struct {
+	ID          int64              `xorm:"pk autoincr"`
+	UserID      int64              `xorm:"UNIQUE(watch)"`
+	RepoID      int64              `xorm:"UNIQUE(watch)"`
+	Mode        WatchMode          `xorm:"SMALLINT NOT NULL DEFAULT 1"`
+	CreatedUnix timeutil.TimeStamp `xorm:"INDEX created"`
+	UpdatedUnix timeutil.TimeStamp `xorm:"INDEX updated"`
+}
+
+func init() {
+	db.RegisterModel(new(Watch))
+}
+
+// GetWatch gets what kind of subscription a user has on a given repository; returns dummy record if none found
+func GetWatch(ctx context.Context, userID, repoID int64) (Watch, error) {
+	watch := Watch{UserID: userID, RepoID: repoID}
+	has, err := db.GetEngine(ctx).Get(&watch)
+	if err != nil {
+		return watch, err
+	}
+	if !has {
+		watch.Mode = WatchModeNone
+	}
+	return watch, nil
+}
+
+// IsWatchMode Decodes watchability of WatchMode
+func IsWatchMode(mode WatchMode) bool {
+	return mode != WatchModeNone && mode != WatchModeDont
+}
+
+// IsWatching checks if user has watched given repository.
+func IsWatching(userID, repoID int64) bool {
+	watch, err := GetWatch(db.DefaultContext, userID, repoID)
+	return err == nil && IsWatchMode(watch.Mode)
+}
+
+func watchRepoMode(ctx context.Context, watch Watch, mode WatchMode) (err error) {
+	if watch.Mode == mode {
+		return nil
+	}
+	if mode == WatchModeAuto && (watch.Mode == WatchModeDont || IsWatchMode(watch.Mode)) {
+		// Don't auto watch if already watching or deliberately not watching
+		return nil
+	}
+
+	hadrec := watch.Mode != WatchModeNone
+	needsrec := mode != WatchModeNone
+	repodiff := 0
+
+	if IsWatchMode(mode) && !IsWatchMode(watch.Mode) {
+		repodiff = 1
+	} else if !IsWatchMode(mode) && IsWatchMode(watch.Mode) {
+		repodiff = -1
+	}
+
+	watch.Mode = mode
+
+	e := db.GetEngine(ctx)
+
+	if !hadrec && needsrec {
+		watch.Mode = mode
+		if _, err = e.Insert(watch); err != nil {
+			return err
+		}
+	} else if needsrec {
+		watch.Mode = mode
+		if _, err := e.ID(watch.ID).AllCols().Update(watch); err != nil {
+			return err
+		}
+	} else if _, err = e.Delete(Watch{ID: watch.ID}); err != nil {
+		return err
+	}
+	if repodiff != 0 {
+		_, err = e.Exec("UPDATE `repository` SET num_watches = num_watches + ? WHERE id = ?", repodiff, watch.RepoID)
+	}
+	return err
+}
+
+// WatchRepoMode watch repository in specific mode.
+func WatchRepoMode(userID, repoID int64, mode WatchMode) (err error) {
+	var watch Watch
+	if watch, err = GetWatch(db.DefaultContext, userID, repoID); err != nil {
+		return err
+	}
+	return watchRepoMode(db.DefaultContext, watch, mode)
+}
+
+// WatchRepoCtx watch or unwatch repository.
+func WatchRepoCtx(ctx context.Context, userID, repoID int64, doWatch bool) (err error) {
+	var watch Watch
+	if watch, err = GetWatch(ctx, userID, repoID); err != nil {
+		return err
+	}
+	if !doWatch && watch.Mode == WatchModeAuto {
+		err = watchRepoMode(ctx, watch, WatchModeDont)
+	} else if !doWatch {
+		err = watchRepoMode(ctx, watch, WatchModeNone)
+	} else {
+		err = watchRepoMode(ctx, watch, WatchModeNormal)
+	}
+	return err
+}
+
+// WatchRepo watch or unwatch repository.
+func WatchRepo(userID, repoID int64, watch bool) (err error) {
+	return WatchRepoCtx(db.DefaultContext, userID, repoID, watch)
+}
+
+// GetWatchers returns all watchers of given repository.
+func GetWatchers(ctx context.Context, repoID int64) ([]*Watch, error) {
+	watches := make([]*Watch, 0, 10)
+	return watches, db.GetEngine(ctx).Where("`watch`.repo_id=?", repoID).
+		And("`watch`.mode<>?", WatchModeDont).
+		And("`user`.is_active=?", true).
+		And("`user`.prohibit_login=?", false).
+		Join("INNER", "`user`", "`user`.id = `watch`.user_id").
+		Find(&watches)
+}
+
+// GetRepoWatchersIDs returns IDs of watchers for a given repo ID
+// but avoids joining with `user` for performance reasons
+// User permissions must be verified elsewhere if required
+func GetRepoWatchersIDs(ctx context.Context, repoID int64) ([]int64, error) {
+	ids := make([]int64, 0, 64)
+	return ids, db.GetEngine(ctx).Table("watch").
+		Where("watch.repo_id=?", repoID).
+		And("watch.mode<>?", WatchModeDont).
+		Select("user_id").
+		Find(&ids)
+}
+
+// GetRepoWatchers returns range of users watching given repository.
+func GetRepoWatchers(repoID int64, opts db.ListOptions) ([]*user_model.User, error) {
+	sess := db.GetEngine(db.DefaultContext).Where("watch.repo_id=?", repoID).
+		Join("LEFT", "watch", "`user`.id=`watch`.user_id").
+		And("`watch`.mode<>?", WatchModeDont)
+	if opts.Page > 0 {
+		sess = db.SetSessionPagination(sess, &opts)
+		users := make([]*user_model.User, 0, opts.PageSize)
+
+		return users, sess.Find(&users)
+	}
+
+	users := make([]*user_model.User, 0, 8)
+	return users, sess.Find(&users)
+}
+
+func watchIfAuto(ctx context.Context, userID, repoID int64, isWrite bool) error {
+	if !isWrite || !setting.Service.AutoWatchOnChanges {
+		return nil
+	}
+	watch, err := GetWatch(ctx, userID, repoID)
+	if err != nil {
+		return err
+	}
+	if watch.Mode != WatchModeNone {
+		return nil
+	}
+	return watchRepoMode(ctx, watch, WatchModeAuto)
+}
+
+// WatchIfAuto subscribes to repo if AutoWatchOnChanges is set
+func WatchIfAuto(userID, repoID int64, isWrite bool) error {
+	return watchIfAuto(db.DefaultContext, userID, repoID, isWrite)
+}

models/repo/watch_test.go

@@ -0,0 +1,139 @@
+// Copyright 2017 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 repo
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/unittest"
+	"code.gitea.io/gitea/modules/setting"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIsWatching(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	assert.True(t, IsWatching(1, 1))
+	assert.True(t, IsWatching(4, 1))
+	assert.True(t, IsWatching(11, 1))
+
+	assert.False(t, IsWatching(1, 5))
+	assert.False(t, IsWatching(8, 1))
+	assert.False(t, IsWatching(unittest.NonexistentID, unittest.NonexistentID))
+}
+
+func TestGetWatchers(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	repo := unittest.AssertExistsAndLoadBean(t, &Repository{ID: 1}).(*Repository)
+	watches, err := GetWatchers(db.DefaultContext, repo.ID)
+	assert.NoError(t, err)
+	// One watchers are inactive, thus minus 1
+	assert.Len(t, watches, repo.NumWatches-1)
+	for _, watch := range watches {
+		assert.EqualValues(t, repo.ID, watch.RepoID)
+	}
+
+	watches, err = GetWatchers(db.DefaultContext, unittest.NonexistentID)
+	assert.NoError(t, err)
+	assert.Len(t, watches, 0)
+}
+
+func TestRepository_GetWatchers(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	repo := unittest.AssertExistsAndLoadBean(t, &Repository{ID: 1}).(*Repository)
+	watchers, err := GetRepoWatchers(repo.ID, db.ListOptions{Page: 1})
+	assert.NoError(t, err)
+	assert.Len(t, watchers, repo.NumWatches)
+	for _, watcher := range watchers {
+		unittest.AssertExistsAndLoadBean(t, &Watch{UserID: watcher.ID, RepoID: repo.ID})
+	}
+
+	repo = unittest.AssertExistsAndLoadBean(t, &Repository{ID: 9}).(*Repository)
+	watchers, err = GetRepoWatchers(repo.ID, db.ListOptions{Page: 1})
+	assert.NoError(t, err)
+	assert.Len(t, watchers, 0)
+}
+
+func TestWatchIfAuto(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	repo := unittest.AssertExistsAndLoadBean(t, &Repository{ID: 1}).(*Repository)
+	watchers, err := GetRepoWatchers(repo.ID, db.ListOptions{Page: 1})
+	assert.NoError(t, err)
+	assert.Len(t, watchers, repo.NumWatches)
+
+	setting.Service.AutoWatchOnChanges = false
+
+	prevCount := repo.NumWatches
+
+	// Must not add watch
+	assert.NoError(t, WatchIfAuto(8, 1, true))
+	watchers, err = GetRepoWatchers(repo.ID, db.ListOptions{Page: 1})
+	assert.NoError(t, err)
+	assert.Len(t, watchers, prevCount)
+
+	// Should not add watch
+	assert.NoError(t, WatchIfAuto(10, 1, true))
+	watchers, err = GetRepoWatchers(repo.ID, db.ListOptions{Page: 1})
+	assert.NoError(t, err)
+	assert.Len(t, watchers, prevCount)
+
+	setting.Service.AutoWatchOnChanges = true
+
+	// Must not add watch
+	assert.NoError(t, WatchIfAuto(8, 1, true))
+	watchers, err = GetRepoWatchers(repo.ID, db.ListOptions{Page: 1})
+	assert.NoError(t, err)
+	assert.Len(t, watchers, prevCount)
+
+	// Should not add watch
+	assert.NoError(t, WatchIfAuto(12, 1, false))
+	watchers, err = GetRepoWatchers(repo.ID, db.ListOptions{Page: 1})
+	assert.NoError(t, err)
+	assert.Len(t, watchers, prevCount)
+
+	// Should add watch
+	assert.NoError(t, WatchIfAuto(12, 1, true))
+	watchers, err = GetRepoWatchers(repo.ID, db.ListOptions{Page: 1})
+	assert.NoError(t, err)
+	assert.Len(t, watchers, prevCount+1)
+
+	// Should remove watch, inhibit from adding auto
+	assert.NoError(t, WatchRepo(12, 1, false))
+	watchers, err = GetRepoWatchers(repo.ID, db.ListOptions{Page: 1})
+	assert.NoError(t, err)
+	assert.Len(t, watchers, prevCount)
+
+	// Must not add watch
+	assert.NoError(t, WatchIfAuto(12, 1, true))
+	watchers, err = GetRepoWatchers(repo.ID, db.ListOptions{Page: 1})
+	assert.NoError(t, err)
+	assert.Len(t, watchers, prevCount)
+}
+
+func TestWatchRepoMode(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	unittest.AssertCount(t, &Watch{UserID: 12, RepoID: 1}, 0)
+
+	assert.NoError(t, WatchRepoMode(12, 1, WatchModeAuto))
+	unittest.AssertCount(t, &Watch{UserID: 12, RepoID: 1}, 1)
+	unittest.AssertCount(t, &Watch{UserID: 12, RepoID: 1, Mode: WatchModeAuto}, 1)
+
+	assert.NoError(t, WatchRepoMode(12, 1, WatchModeNormal))
+	unittest.AssertCount(t, &Watch{UserID: 12, RepoID: 1}, 1)
+	unittest.AssertCount(t, &Watch{UserID: 12, RepoID: 1, Mode: WatchModeNormal}, 1)
+
+	assert.NoError(t, WatchRepoMode(12, 1, WatchModeDont))
+	unittest.AssertCount(t, &Watch{UserID: 12, RepoID: 1}, 1)
+	unittest.AssertCount(t, &Watch{UserID: 12, RepoID: 1, Mode: WatchModeDont}, 1)
+
+	assert.NoError(t, WatchRepoMode(12, 1, WatchModeNone))
+	unittest.AssertCount(t, &Watch{UserID: 12, RepoID: 1}, 0)
+}