Adding upstream version 9.0.0.

Signed-off-by: Daniel Baumann <daniel@debian.org>

17 files changed, 2948 insertions, 0 deletions

diff --git a/models/organization/TestInconsistentOwnerTeam/team.yml b/models/organization/TestInconsistentOwnerTeam/team.yml
new file mode 100644
index 0000000..90e3ad4
--- /dev/null
+++ b/models/organization/TestInconsistentOwnerTeam/team.yml
@@ -0,0 +1,10 @@
+-
+  id: 1000
+  org_id: 1000
+  lower_name: owners
+  name: Owners
+  authorize: 4 # owner
+  num_repos: 0
+  num_members: 0
+  includes_all_repositories: true
+  can_create_org_repo: true
diff --git a/models/organization/TestInconsistentOwnerTeam/team_unit.yml b/models/organization/TestInconsistentOwnerTeam/team_unit.yml
new file mode 100644
index 0000000..91e03d6
--- /dev/null
+++ b/models/organization/TestInconsistentOwnerTeam/team_unit.yml
@@ -0,0 +1,59 @@
+-
+  id: 1000
+  team_id: 1000
+  type: 1
+  access_mode: 0 # None
+
+-
+  id: 1001
+  team_id: 1000
+  type: 2
+  access_mode: 0
+
+-
+  id: 1002
+  team_id: 1000
+  type: 3
+  access_mode: 0
+
+-
+  id: 1003
+  team_id: 1000
+  type: 4
+  access_mode: 0
+
+-
+  id: 1004
+  team_id: 1000
+  type: 5
+  access_mode: 0
+
+-
+  id: 1005
+  team_id: 1000
+  type: 6
+  access_mode: 0
+
+-
+  id: 1006
+  team_id: 1000
+  type: 7
+  access_mode: 0
+
+-
+  id: 1007
+  team_id: 1000
+  type: 8
+  access_mode: 0
+
+-
+  id: 1008
+  team_id: 1000
+  type: 9
+  access_mode: 0
+
+-
+  id: 1009
+  team_id: 1000
+  type: 10
+  access_mode: 0
diff --git a/models/organization/main_test.go b/models/organization/main_test.go
new file mode 100644
index 0000000..c35898a
--- /dev/null
+++ b/models/organization/main_test.go
@@ -0,0 +1,21 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package organization_test
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models/unittest"
+
+	_ "code.gitea.io/gitea/models"
+	_ "code.gitea.io/gitea/models/actions"
+	_ "code.gitea.io/gitea/models/activities"
+	_ "code.gitea.io/gitea/models/organization"
+	_ "code.gitea.io/gitea/models/repo"
+	_ "code.gitea.io/gitea/models/user"
+)
+
+func TestMain(m *testing.M) {
+	unittest.MainTest(m)
+}
diff --git a/models/organization/mini_org.go b/models/organization/mini_org.go
new file mode 100644
index 0000000..b1b2462
--- /dev/null
+++ b/models/organization/mini_org.go
@@ -0,0 +1,78 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package organization
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"code.gitea.io/gitea/models/db"
+	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/models/unit"
+	user_model "code.gitea.io/gitea/models/user"
+
+	"xorm.io/builder"
+)
+
+// MinimalOrg represents a simple organization with only the needed columns
+type MinimalOrg = Organization
+
+// GetUserOrgsList returns all organizations the given user has access to
+func GetUserOrgsList(ctx context.Context, user *user_model.User) ([]*MinimalOrg, error) {
+	schema, err := db.TableInfo(new(user_model.User))
+	if err != nil {
+		return nil, err
+	}
+
+	outputCols := []string{
+		"id",
+		"name",
+		"full_name",
+		"visibility",
+		"avatar",
+		"avatar_email",
+		"use_custom_avatar",
+	}
+
+	groupByCols := &strings.Builder{}
+	for _, col := range outputCols {
+		fmt.Fprintf(groupByCols, "`%s`.%s,", schema.Name, col)
+	}
+	groupByStr := groupByCols.String()
+	groupByStr = groupByStr[0 : len(groupByStr)-1]
+
+	sess := db.GetEngine(ctx)
+	sess = sess.Select(groupByStr+", count(distinct repo_id) as org_count").
+		Table("user").
+		Join("INNER", "team", "`team`.org_id = `user`.id").
+		Join("INNER", "team_user", "`team`.id = `team_user`.team_id").
+		Join("LEFT", builder.
+			Select("id as repo_id, owner_id as repo_owner_id").
+			From("repository").
+			Where(repo_model.AccessibleRepositoryCondition(user, unit.TypeInvalid)), "`repository`.repo_owner_id = `team`.org_id").
+		Where("`team_user`.uid = ?", user.ID).
+		GroupBy(groupByStr)
+
+	type OrgCount struct {
+		Organization `xorm:"extends"`
+		OrgCount     int
+	}
+
+	orgCounts := make([]*OrgCount, 0, 10)
+
+	if err := sess.
+		Asc("`user`.name").
+		Find(&orgCounts); err != nil {
+		return nil, err
+	}
+
+	orgs := make([]*MinimalOrg, len(orgCounts))
+	for i, orgCount := range orgCounts {
+		orgCount.Organization.NumRepos = orgCount.OrgCount
+		orgs[i] = &orgCount.Organization
+	}
+
+	return orgs, nil
+}
diff --git a/models/organization/org.go b/models/organization/org.go
new file mode 100644
index 0000000..45f19c7
--- /dev/null
+++ b/models/organization/org.go
@@ -0,0 +1,833 @@
+// Copyright 2014 The Gogs Authors. All rights reserved.
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package organization
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	actions_model "code.gitea.io/gitea/models/actions"
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/perm"
+	repo_model "code.gitea.io/gitea/models/repo"
+	secret_model "code.gitea.io/gitea/models/secret"
+	"code.gitea.io/gitea/models/unit"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/structs"
+	"code.gitea.io/gitea/modules/util"
+
+	"xorm.io/builder"
+)
+
+// ________                            .__                __  .__
+// \_____  \_______  _________    ____ |__|____________ _/  |_|__| ____   ____
+//  /   |   \_  __ \/ ___\__  \  /    \|  \___   /\__  \\   __\  |/  _ \ /    \
+// /    |    \  | \/ /_/  > __ \|   |  \  |/    /  / __ \|  | |  (  <_> )   |  \
+// \_______  /__|  \___  (____  /___|  /__/_____ \(____  /__| |__|\____/|___|  /
+//         \/     /_____/     \/     \/         \/     \/                    \/
+
+// ErrOrgNotExist represents a "OrgNotExist" kind of error.
+type ErrOrgNotExist struct {
+	ID   int64
+	Name string
+}
+
+// IsErrOrgNotExist checks if an error is a ErrOrgNotExist.
+func IsErrOrgNotExist(err error) bool {
+	_, ok := err.(ErrOrgNotExist)
+	return ok
+}
+
+func (err ErrOrgNotExist) Error() string {
+	return fmt.Sprintf("org does not exist [id: %d, name: %s]", err.ID, err.Name)
+}
+
+func (err ErrOrgNotExist) Unwrap() error {
+	return util.ErrNotExist
+}
+
+// ErrLastOrgOwner represents a "LastOrgOwner" kind of error.
+type ErrLastOrgOwner struct {
+	UID int64
+}
+
+// IsErrLastOrgOwner checks if an error is a ErrLastOrgOwner.
+func IsErrLastOrgOwner(err error) bool {
+	_, ok := err.(ErrLastOrgOwner)
+	return ok
+}
+
+func (err ErrLastOrgOwner) Error() string {
+	return fmt.Sprintf("user is the last member of owner team [uid: %d]", err.UID)
+}
+
+// ErrUserNotAllowedCreateOrg represents a "UserNotAllowedCreateOrg" kind of error.
+type ErrUserNotAllowedCreateOrg struct{}
+
+// IsErrUserNotAllowedCreateOrg checks if an error is an ErrUserNotAllowedCreateOrg.
+func IsErrUserNotAllowedCreateOrg(err error) bool {
+	_, ok := err.(ErrUserNotAllowedCreateOrg)
+	return ok
+}
+
+func (err ErrUserNotAllowedCreateOrg) Error() string {
+	return "user is not allowed to create organizations"
+}
+
+func (err ErrUserNotAllowedCreateOrg) Unwrap() error {
+	return util.ErrPermissionDenied
+}
+
+// Organization represents an organization
+type Organization user_model.User
+
+// OrgFromUser converts user to organization
+func OrgFromUser(user *user_model.User) *Organization {
+	return (*Organization)(user)
+}
+
+// TableName represents the real table name of Organization
+func (Organization) TableName() string {
+	return "user"
+}
+
+// IsOwnedBy returns true if given user is in the owner team.
+func (org *Organization) IsOwnedBy(ctx context.Context, uid int64) (bool, error) {
+	return IsOrganizationOwner(ctx, org.ID, uid)
+}
+
+// IsOrgAdmin returns true if given user is in the owner team or an admin team.
+func (org *Organization) IsOrgAdmin(ctx context.Context, uid int64) (bool, error) {
+	return IsOrganizationAdmin(ctx, org.ID, uid)
+}
+
+// IsOrgMember returns true if given user is member of organization.
+func (org *Organization) IsOrgMember(ctx context.Context, uid int64) (bool, error) {
+	return IsOrganizationMember(ctx, org.ID, uid)
+}
+
+// CanCreateOrgRepo returns true if given user can create repo in organization
+func (org *Organization) CanCreateOrgRepo(ctx context.Context, uid int64) (bool, error) {
+	return CanCreateOrgRepo(ctx, org.ID, uid)
+}
+
+// GetTeam returns named team of organization.
+func (org *Organization) GetTeam(ctx context.Context, name string) (*Team, error) {
+	return GetTeam(ctx, org.ID, name)
+}
+
+// GetOwnerTeam returns owner team of organization.
+func (org *Organization) GetOwnerTeam(ctx context.Context) (*Team, error) {
+	return org.GetTeam(ctx, OwnerTeamName)
+}
+
+// FindOrgTeams returns all teams of a given organization
+func FindOrgTeams(ctx context.Context, orgID int64) ([]*Team, error) {
+	var teams []*Team
+	return teams, db.GetEngine(ctx).
+		Where("org_id=?", orgID).
+		OrderBy("CASE WHEN name LIKE '" + OwnerTeamName + "' THEN '' ELSE name END").
+		Find(&teams)
+}
+
+// LoadTeams load teams if not loaded.
+func (org *Organization) LoadTeams(ctx context.Context) ([]*Team, error) {
+	return FindOrgTeams(ctx, org.ID)
+}
+
+// GetMembers returns all members of organization.
+func (org *Organization) GetMembers(ctx context.Context) (user_model.UserList, map[int64]bool, error) {
+	return FindOrgMembers(ctx, &FindOrgMembersOpts{
+		OrgID: org.ID,
+	})
+}
+
+// HasMemberWithUserID returns true if user with userID is part of the u organisation.
+func (org *Organization) HasMemberWithUserID(ctx context.Context, userID int64) bool {
+	return org.hasMemberWithUserID(ctx, userID)
+}
+
+func (org *Organization) hasMemberWithUserID(ctx context.Context, userID int64) bool {
+	isMember, err := IsOrganizationMember(ctx, org.ID, userID)
+	if err != nil {
+		log.Error("IsOrganizationMember: %v", err)
+		return false
+	}
+	return isMember
+}
+
+// AvatarLink returns the full avatar link with http host
+func (org *Organization) AvatarLink(ctx context.Context) string {
+	return org.AsUser().AvatarLink(ctx)
+}
+
+// HTMLURL returns the organization's full link.
+func (org *Organization) HTMLURL() string {
+	return org.AsUser().HTMLURL()
+}
+
+// OrganisationLink returns the organization sub page link.
+func (org *Organization) OrganisationLink() string {
+	return org.AsUser().OrganisationLink()
+}
+
+// ShortName ellipses username to length
+func (org *Organization) ShortName(length int) string {
+	return org.AsUser().ShortName(length)
+}
+
+// HomeLink returns the user or organization home page link.
+func (org *Organization) HomeLink() string {
+	return org.AsUser().HomeLink()
+}
+
+// CanCreateRepo returns if user login can create a repository
+// NOTE: functions calling this assume a failure due to repository count limit; if new checks are added, those functions should be revised
+func (org *Organization) CanCreateRepo() bool {
+	return org.AsUser().CanCreateRepo()
+}
+
+// FindOrgMembersOpts represensts find org members conditions
+type FindOrgMembersOpts struct {
+	db.ListOptions
+	OrgID      int64
+	PublicOnly bool
+}
+
+// CountOrgMembers counts the organization's members
+func CountOrgMembers(ctx context.Context, opts *FindOrgMembersOpts) (int64, error) {
+	sess := db.GetEngine(ctx).Where("org_id=?", opts.OrgID)
+	if opts.PublicOnly {
+		sess.And("is_public = ?", true)
+	}
+	return sess.Count(new(OrgUser))
+}
+
+// FindOrgMembers loads organization members according conditions
+func FindOrgMembers(ctx context.Context, opts *FindOrgMembersOpts) (user_model.UserList, map[int64]bool, error) {
+	ous, err := GetOrgUsersByOrgID(ctx, opts)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	ids := make([]int64, len(ous))
+	idsIsPublic := make(map[int64]bool, len(ous))
+	for i, ou := range ous {
+		ids[i] = ou.UID
+		idsIsPublic[ou.UID] = ou.IsPublic
+	}
+
+	users, err := user_model.GetUsersByIDs(ctx, ids)
+	if err != nil {
+		return nil, nil, err
+	}
+	return users, idsIsPublic, nil
+}
+
+// AsUser returns the org as user object
+func (org *Organization) AsUser() *user_model.User {
+	return (*user_model.User)(org)
+}
+
+// DisplayName returns full name if it's not empty,
+// returns username otherwise.
+func (org *Organization) DisplayName() string {
+	return org.AsUser().DisplayName()
+}
+
+// CustomAvatarRelativePath returns user custom avatar relative path.
+func (org *Organization) CustomAvatarRelativePath() string {
+	return org.Avatar
+}
+
+// UnitPermission returns unit permission
+func (org *Organization) UnitPermission(ctx context.Context, doer *user_model.User, unitType unit.Type) perm.AccessMode {
+	if doer != nil {
+		teams, err := GetUserOrgTeams(ctx, org.ID, doer.ID)
+		if err != nil {
+			log.Error("GetUserOrgTeams: %v", err)
+			return perm.AccessModeNone
+		}
+
+		if err := teams.LoadUnits(ctx); err != nil {
+			log.Error("LoadUnits: %v", err)
+			return perm.AccessModeNone
+		}
+
+		if len(teams) > 0 {
+			return teams.UnitMaxAccess(unitType)
+		}
+	}
+
+	if org.Visibility.IsPublic() {
+		return perm.AccessModeRead
+	}
+
+	return perm.AccessModeNone
+}
+
+// CreateOrganization creates record of a new organization.
+func CreateOrganization(ctx context.Context, org *Organization, owner *user_model.User) (err error) {
+	if !owner.CanCreateOrganization() {
+		return ErrUserNotAllowedCreateOrg{}
+	}
+
+	if err = user_model.IsUsableUsername(org.Name); err != nil {
+		return err
+	}
+
+	isExist, err := user_model.IsUserExist(ctx, 0, org.Name)
+	if err != nil {
+		return err
+	} else if isExist {
+		return user_model.ErrUserAlreadyExist{Name: org.Name}
+	}
+
+	org.LowerName = strings.ToLower(org.Name)
+	if org.Rands, err = user_model.GetUserSalt(); err != nil {
+		return err
+	}
+	if org.Salt, err = user_model.GetUserSalt(); err != nil {
+		return err
+	}
+	org.UseCustomAvatar = true
+	org.MaxRepoCreation = -1
+	org.NumTeams = 1
+	org.NumMembers = 1
+	org.Type = user_model.UserTypeOrganization
+
+	ctx, committer, err := db.TxContext(ctx)
+	if err != nil {
+		return err
+	}
+	defer committer.Close()
+
+	if err = user_model.DeleteUserRedirect(ctx, org.Name); err != nil {
+		return err
+	}
+
+	if err = db.Insert(ctx, org); err != nil {
+		return fmt.Errorf("insert organization: %w", err)
+	}
+	if err = user_model.GenerateRandomAvatar(ctx, org.AsUser()); err != nil {
+		return fmt.Errorf("generate random avatar: %w", err)
+	}
+
+	// Add initial creator to organization and owner team.
+	if err = db.Insert(ctx, &OrgUser{
+		UID:      owner.ID,
+		OrgID:    org.ID,
+		IsPublic: setting.Service.DefaultOrgMemberVisible,
+	}); err != nil {
+		return fmt.Errorf("insert org-user relation: %w", err)
+	}
+
+	// Create default owner team.
+	t := &Team{
+		OrgID:                   org.ID,
+		LowerName:               strings.ToLower(OwnerTeamName),
+		Name:                    OwnerTeamName,
+		AccessMode:              perm.AccessModeOwner,
+		NumMembers:              1,
+		IncludesAllRepositories: true,
+		CanCreateOrgRepo:        true,
+	}
+	if err = db.Insert(ctx, t); err != nil {
+		return fmt.Errorf("insert owner team: %w", err)
+	}
+
+	// insert units for team
+	units := make([]TeamUnit, 0, len(unit.AllRepoUnitTypes))
+	for _, tp := range unit.AllRepoUnitTypes {
+		up := perm.AccessModeOwner
+		if tp == unit.TypeExternalTracker || tp == unit.TypeExternalWiki {
+			up = perm.AccessModeRead
+		}
+		units = append(units, TeamUnit{
+			OrgID:      org.ID,
+			TeamID:     t.ID,
+			Type:       tp,
+			AccessMode: up,
+		})
+	}
+
+	if err = db.Insert(ctx, &units); err != nil {
+		return err
+	}
+
+	if err = db.Insert(ctx, &TeamUser{
+		UID:    owner.ID,
+		OrgID:  org.ID,
+		TeamID: t.ID,
+	}); err != nil {
+		return fmt.Errorf("insert team-user relation: %w", err)
+	}
+
+	return committer.Commit()
+}
+
+// GetOrgByName returns organization by given name.
+func GetOrgByName(ctx context.Context, name string) (*Organization, error) {
+	if len(name) == 0 {
+		return nil, ErrOrgNotExist{0, name}
+	}
+	u := &Organization{
+		LowerName: strings.ToLower(name),
+		Type:      user_model.UserTypeOrganization,
+	}
+	has, err := db.GetEngine(ctx).Get(u)
+	if err != nil {
+		return nil, err
+	} else if !has {
+		return nil, ErrOrgNotExist{0, name}
+	}
+	return u, nil
+}
+
+// DeleteOrganization deletes models associated to an organization.
+func DeleteOrganization(ctx context.Context, org *Organization) error {
+	if org.Type != user_model.UserTypeOrganization {
+		return fmt.Errorf("%s is a user not an organization", org.Name)
+	}
+
+	if err := db.DeleteBeans(ctx,
+		&Team{OrgID: org.ID},
+		&OrgUser{OrgID: org.ID},
+		&TeamUser{OrgID: org.ID},
+		&TeamUnit{OrgID: org.ID},
+		&TeamInvite{OrgID: org.ID},
+		&secret_model.Secret{OwnerID: org.ID},
+		&actions_model.ActionRunner{OwnerID: org.ID},
+		&actions_model.ActionRunnerToken{OwnerID: org.ID},
+	); err != nil {
+		return fmt.Errorf("DeleteBeans: %w", err)
+	}
+
+	if _, err := db.GetEngine(ctx).ID(org.ID).Delete(new(user_model.User)); err != nil {
+		return fmt.Errorf("Delete: %w", err)
+	}
+
+	return nil
+}
+
+// GetOrgUserMaxAuthorizeLevel returns highest authorize level of user in an organization
+func (org *Organization) GetOrgUserMaxAuthorizeLevel(ctx context.Context, uid int64) (perm.AccessMode, error) {
+	var authorize perm.AccessMode
+	_, err := db.GetEngine(ctx).
+		Select("max(team.authorize)").
+		Table("team").
+		Join("INNER", "team_user", "team_user.team_id = team.id").
+		Where("team_user.uid = ?", uid).
+		And("team_user.org_id = ?", org.ID).
+		Get(&authorize)
+	return authorize, err
+}
+
+// GetUsersWhoCanCreateOrgRepo returns users which are able to create repo in organization
+func GetUsersWhoCanCreateOrgRepo(ctx context.Context, orgID int64) (map[int64]*user_model.User, error) {
+	// Use a map, in order to de-duplicate users.
+	users := make(map[int64]*user_model.User)
+	return users, db.GetEngine(ctx).
+		Join("INNER", "`team_user`", "`team_user`.uid=`user`.id").
+		Join("INNER", "`team`", "`team`.id=`team_user`.team_id").
+		Where(builder.Eq{"team.can_create_org_repo": true}.Or(builder.Eq{"team.authorize": perm.AccessModeOwner})).
+		And("team_user.org_id = ?", orgID).Find(&users)
+}
+
+// SearchOrganizationsOptions options to filter organizations
+type SearchOrganizationsOptions struct {
+	db.ListOptions
+	All bool
+}
+
+// FindOrgOptions finds orgs options
+type FindOrgOptions struct {
+	db.ListOptions
+	UserID         int64
+	IncludePrivate bool
+}
+
+func queryUserOrgIDs(userID int64, includePrivate bool) *builder.Builder {
+	cond := builder.Eq{"uid": userID}
+	if !includePrivate {
+		cond["is_public"] = true
+	}
+	return builder.Select("org_id").From("org_user").Where(cond)
+}
+
+func (opts FindOrgOptions) ToConds() builder.Cond {
+	var cond builder.Cond = builder.Eq{"`user`.`type`": user_model.UserTypeOrganization}
+	if opts.UserID > 0 {
+		cond = cond.And(builder.In("`user`.`id`", queryUserOrgIDs(opts.UserID, opts.IncludePrivate)))
+	}
+	if !opts.IncludePrivate {
+		cond = cond.And(builder.Eq{"`user`.visibility": structs.VisibleTypePublic})
+	}
+	return cond
+}
+
+func (opts FindOrgOptions) ToOrders() string {
+	return "`user`.name ASC"
+}
+
+// HasOrgOrUserVisible tells if the given user can see the given org or user
+func HasOrgOrUserVisible(ctx context.Context, orgOrUser, user *user_model.User) bool {
+	// If user is nil, it's an anonymous user/request.
+	// The Ghost user is handled like an anonymous user.
+	if user == nil || user.IsGhost() {
+		return orgOrUser.Visibility == structs.VisibleTypePublic
+	}
+
+	if user.IsAdmin || orgOrUser.ID == user.ID {
+		return true
+	}
+
+	if (orgOrUser.Visibility == structs.VisibleTypePrivate || user.IsRestricted) && !OrgFromUser(orgOrUser).hasMemberWithUserID(ctx, user.ID) {
+		return false
+	}
+	return true
+}
+
+// HasOrgsVisible tells if the given user can see at least one of the orgs provided
+func HasOrgsVisible(ctx context.Context, orgs []*Organization, user *user_model.User) bool {
+	if len(orgs) == 0 {
+		return false
+	}
+
+	for _, org := range orgs {
+		if HasOrgOrUserVisible(ctx, org.AsUser(), user) {
+			return true
+		}
+	}
+	return false
+}
+
+// GetOrgsCanCreateRepoByUserID returns a list of organizations where given user ID
+// are allowed to create repos.
+func GetOrgsCanCreateRepoByUserID(ctx context.Context, userID int64) ([]*Organization, error) {
+	orgs := make([]*Organization, 0, 10)
+
+	return orgs, db.GetEngine(ctx).Where(builder.In("id", builder.Select("`user`.id").From("`user`").
+		Join("INNER", "`team_user`", "`team_user`.org_id = `user`.id").
+		Join("INNER", "`team`", "`team`.id = `team_user`.team_id").
+		Where(builder.Eq{"`team_user`.uid": userID}).
+		And(builder.Eq{"`team`.authorize": perm.AccessModeOwner}.Or(builder.Eq{"`team`.can_create_org_repo": true})))).
+		Asc("`user`.name").
+		Find(&orgs)
+}
+
+// GetOrgUsersByOrgID returns all organization-user relations by organization ID.
+func GetOrgUsersByOrgID(ctx context.Context, opts *FindOrgMembersOpts) ([]*OrgUser, error) {
+	sess := db.GetEngine(ctx).Where("org_id=?", opts.OrgID)
+	if opts.PublicOnly {
+		sess.And("is_public = ?", true)
+	}
+	if opts.ListOptions.PageSize > 0 {
+		sess = db.SetSessionPagination(sess, opts)
+
+		ous := make([]*OrgUser, 0, opts.PageSize)
+		return ous, sess.Find(&ous)
+	}
+
+	var ous []*OrgUser
+	return ous, sess.Find(&ous)
+}
+
+// ChangeOrgUserStatus changes public or private membership status.
+func ChangeOrgUserStatus(ctx context.Context, orgID, uid int64, public bool) error {
+	ou := new(OrgUser)
+	has, err := db.GetEngine(ctx).
+		Where("uid=?", uid).
+		And("org_id=?", orgID).
+		Get(ou)
+	if err != nil {
+		return err
+	} else if !has {
+		return nil
+	}
+
+	ou.IsPublic = public
+	_, err = db.GetEngine(ctx).ID(ou.ID).Cols("is_public").Update(ou)
+	return err
+}
+
+// AddOrgUser adds new user to given organization.
+func AddOrgUser(ctx context.Context, orgID, uid int64) error {
+	isAlreadyMember, err := IsOrganizationMember(ctx, orgID, uid)
+	if err != nil || isAlreadyMember {
+		return err
+	}
+
+	ctx, committer, err := db.TxContext(ctx)
+	if err != nil {
+		return err
+	}
+	defer committer.Close()
+
+	// check in transaction
+	isAlreadyMember, err = IsOrganizationMember(ctx, orgID, uid)
+	if err != nil || isAlreadyMember {
+		return err
+	}
+
+	ou := &OrgUser{
+		UID:      uid,
+		OrgID:    orgID,
+		IsPublic: setting.Service.DefaultOrgMemberVisible,
+	}
+
+	if err := db.Insert(ctx, ou); err != nil {
+		return err
+	} else if _, err = db.Exec(ctx, "UPDATE `user` SET num_members = num_members + 1 WHERE id = ?", orgID); err != nil {
+		return err
+	}
+
+	return committer.Commit()
+}
+
+// GetOrgByID returns the user object by given ID if exists.
+func GetOrgByID(ctx context.Context, id int64) (*Organization, error) {
+	u := new(Organization)
+	has, err := db.GetEngine(ctx).ID(id).Get(u)
+	if err != nil {
+		return nil, err
+	} else if !has {
+		return nil, user_model.ErrUserNotExist{
+			UID: id,
+		}
+	}
+	return u, nil
+}
+
+// RemoveOrgRepo removes all team-repository relations of organization.
+func RemoveOrgRepo(ctx context.Context, orgID, repoID int64) error {
+	teamRepos := make([]*TeamRepo, 0, 10)
+	e := db.GetEngine(ctx)
+	if err := e.Find(&teamRepos, &TeamRepo{OrgID: orgID, RepoID: repoID}); err != nil {
+		return err
+	}
+
+	if len(teamRepos) == 0 {
+		return nil
+	}
+
+	if _, err := e.Delete(&TeamRepo{
+		OrgID:  orgID,
+		RepoID: repoID,
+	}); err != nil {
+		return err
+	}
+
+	teamIDs := make([]int64, len(teamRepos))
+	for i, teamRepo := range teamRepos {
+		teamIDs[i] = teamRepo.TeamID
+	}
+
+	_, err := e.Decr("num_repos").In("id", teamIDs).Update(new(Team))
+	return err
+}
+
+func (org *Organization) getUserTeams(ctx context.Context, userID int64, cols ...string) ([]*Team, error) {
+	teams := make([]*Team, 0, org.NumTeams)
+	return teams, db.GetEngine(ctx).
+		Where("`team_user`.org_id = ?", org.ID).
+		Join("INNER", "team_user", "`team_user`.team_id = team.id").
+		Join("INNER", "`user`", "`user`.id=team_user.uid").
+		And("`team_user`.uid = ?", userID).
+		Asc("`user`.name").
+		Cols(cols...).
+		Find(&teams)
+}
+
+func (org *Organization) getUserTeamIDs(ctx context.Context, userID int64) ([]int64, error) {
+	teamIDs := make([]int64, 0, org.NumTeams)
+	return teamIDs, db.GetEngine(ctx).
+		Table("team").
+		Cols("team.id").
+		Where("`team_user`.org_id = ?", org.ID).
+		Join("INNER", "team_user", "`team_user`.team_id = team.id").
+		And("`team_user`.uid = ?", userID).
+		Find(&teamIDs)
+}
+
+// TeamsWithAccessToRepo returns all teams that have given access level to the repository.
+func (org *Organization) TeamsWithAccessToRepo(ctx context.Context, repoID int64, mode perm.AccessMode) ([]*Team, error) {
+	return GetTeamsWithAccessToRepo(ctx, org.ID, repoID, mode)
+}
+
+// GetUserTeamIDs returns of all team IDs of the organization that user is member of.
+func (org *Organization) GetUserTeamIDs(ctx context.Context, userID int64) ([]int64, error) {
+	return org.getUserTeamIDs(ctx, userID)
+}
+
+// GetUserTeams returns all teams that belong to user,
+// and that the user has joined.
+func (org *Organization) GetUserTeams(ctx context.Context, userID int64) ([]*Team, error) {
+	return org.getUserTeams(ctx, userID)
+}
+
+// AccessibleReposEnvironment operations involving the repositories that are
+// accessible to a particular user
+type AccessibleReposEnvironment interface {
+	CountRepos() (int64, error)
+	RepoIDs(page, pageSize int) ([]int64, error)
+	Repos(page, pageSize int) (repo_model.RepositoryList, error)
+	MirrorRepos() (repo_model.RepositoryList, error)
+	AddKeyword(keyword string)
+	SetSort(db.SearchOrderBy)
+}
+
+type accessibleReposEnv struct {
+	org     *Organization
+	user    *user_model.User
+	team    *Team
+	teamIDs []int64
+	ctx     context.Context
+	keyword string
+	orderBy db.SearchOrderBy
+}
+
+// AccessibleReposEnv builds an AccessibleReposEnvironment for the repositories in `org`
+// that are accessible to the specified user.
+func AccessibleReposEnv(ctx context.Context, org *Organization, userID int64) (AccessibleReposEnvironment, error) {
+	var user *user_model.User
+
+	if userID > 0 {
+		u, err := user_model.GetUserByID(ctx, userID)
+		if err != nil {
+			return nil, err
+		}
+		user = u
+	}
+
+	teamIDs, err := org.getUserTeamIDs(ctx, userID)
+	if err != nil {
+		return nil, err
+	}
+	return &accessibleReposEnv{
+		org:     org,
+		user:    user,
+		teamIDs: teamIDs,
+		ctx:     ctx,
+		orderBy: db.SearchOrderByRecentUpdated,
+	}, nil
+}
+
+// AccessibleTeamReposEnv an AccessibleReposEnvironment for the repositories in `org`
+// that are accessible to the specified team.
+func (org *Organization) AccessibleTeamReposEnv(ctx context.Context, team *Team) AccessibleReposEnvironment {
+	return &accessibleReposEnv{
+		org:     org,
+		team:    team,
+		ctx:     ctx,
+		orderBy: db.SearchOrderByRecentUpdated,
+	}
+}
+
+func (env *accessibleReposEnv) cond() builder.Cond {
+	cond := builder.NewCond()
+	if env.team != nil {
+		cond = cond.And(builder.Eq{"team_repo.team_id": env.team.ID})
+	} else {
+		if env.user == nil || !env.user.IsRestricted {
+			cond = cond.Or(builder.Eq{
+				"`repository`.owner_id":   env.org.ID,
+				"`repository`.is_private": false,
+			})
+		}
+		if len(env.teamIDs) > 0 {
+			cond = cond.Or(builder.In("team_repo.team_id", env.teamIDs))
+		}
+	}
+	if env.keyword != "" {
+		cond = cond.And(builder.Like{"`repository`.lower_name", strings.ToLower(env.keyword)})
+	}
+	return cond
+}
+
+func (env *accessibleReposEnv) CountRepos() (int64, error) {
+	repoCount, err := db.GetEngine(env.ctx).
+		Join("INNER", "team_repo", "`team_repo`.repo_id=`repository`.id").
+		Where(env.cond()).
+		Distinct("`repository`.id").
+		Count(&repo_model.Repository{})
+	if err != nil {
+		return 0, fmt.Errorf("count user repositories in organization: %w", err)
+	}
+	return repoCount, nil
+}
+
+func (env *accessibleReposEnv) RepoIDs(page, pageSize int) ([]int64, error) {
+	if page <= 0 {
+		page = 1
+	}
+
+	repoIDs := make([]int64, 0, pageSize)
+	return repoIDs, db.GetEngine(env.ctx).
+		Table("repository").
+		Join("INNER", "team_repo", "`team_repo`.repo_id=`repository`.id").
+		Where(env.cond()).
+		GroupBy("`repository`.id,`repository`."+strings.Fields(string(env.orderBy))[0]).
+		OrderBy(string(env.orderBy)).
+		Limit(pageSize, (page-1)*pageSize).
+		Cols("`repository`.id").
+		Find(&repoIDs)
+}
+
+func (env *accessibleReposEnv) Repos(page, pageSize int) (repo_model.RepositoryList, error) {
+	repoIDs, err := env.RepoIDs(page, pageSize)
+	if err != nil {
+		return nil, fmt.Errorf("GetUserRepositoryIDs: %w", err)
+	}
+
+	repos := make([]*repo_model.Repository, 0, len(repoIDs))
+	if len(repoIDs) == 0 {
+		return repos, nil
+	}
+
+	return repos, db.GetEngine(env.ctx).
+		In("`repository`.id", repoIDs).
+		OrderBy(string(env.orderBy)).
+		Find(&repos)
+}
+
+func (env *accessibleReposEnv) MirrorRepoIDs() ([]int64, error) {
+	repoIDs := make([]int64, 0, 10)
+	return repoIDs, db.GetEngine(env.ctx).
+		Table("repository").
+		Join("INNER", "team_repo", "`team_repo`.repo_id=`repository`.id AND `repository`.is_mirror=?", true).
+		Where(env.cond()).
+		GroupBy("`repository`.id, `repository`.updated_unix").
+		OrderBy(string(env.orderBy)).
+		Cols("`repository`.id").
+		Find(&repoIDs)
+}
+
+func (env *accessibleReposEnv) MirrorRepos() (repo_model.RepositoryList, error) {
+	repoIDs, err := env.MirrorRepoIDs()
+	if err != nil {
+		return nil, fmt.Errorf("MirrorRepoIDs: %w", err)
+	}
+
+	repos := make([]*repo_model.Repository, 0, len(repoIDs))
+	if len(repoIDs) == 0 {
+		return repos, nil
+	}
+
+	return repos, db.GetEngine(env.ctx).
+		In("`repository`.id", repoIDs).
+		Find(&repos)
+}
+
+func (env *accessibleReposEnv) AddKeyword(keyword string) {
+	env.keyword = keyword
+}
+
+func (env *accessibleReposEnv) SetSort(orderBy db.SearchOrderBy) {
+	env.orderBy = orderBy
+}
diff --git a/models/organization/org_repo.go b/models/organization/org_repo.go
new file mode 100644
index 0000000..f7e5992
--- /dev/null
+++ b/models/organization/org_repo.go
@@ -0,0 +1,17 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package organization
+
+import (
+	"context"
+
+	"code.gitea.io/gitea/models/db"
+	repo_model "code.gitea.io/gitea/models/repo"
+)
+
+// GetOrgRepositories get repos belonging to the given organization
+func GetOrgRepositories(ctx context.Context, orgID int64) (repo_model.RepositoryList, error) {
+	var orgRepos []*repo_model.Repository
+	return orgRepos, db.GetEngine(ctx).Where("owner_id = ?", orgID).Find(&orgRepos)
+}
diff --git a/models/organization/org_test.go b/models/organization/org_test.go
new file mode 100644
index 0000000..fa4c512
--- /dev/null
+++ b/models/organization/org_test.go
@@ -0,0 +1,514 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package organization_test
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/organization"
+	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/models/unittest"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/structs"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestUser_IsOwnedBy(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	for _, testCase := range []struct {
+		OrgID         int64
+		UserID        int64
+		ExpectedOwner bool
+	}{
+		{3, 2, true},
+		{3, 1, false},
+		{3, 3, false},
+		{3, 4, false},
+		{2, 2, false}, // user2 is not an organization
+		{2, 3, false},
+	} {
+		org := unittest.AssertExistsAndLoadBean(t, &organization.Organization{ID: testCase.OrgID})
+		isOwner, err := org.IsOwnedBy(db.DefaultContext, testCase.UserID)
+		require.NoError(t, err)
+		assert.Equal(t, testCase.ExpectedOwner, isOwner)
+	}
+}
+
+func TestUser_IsOrgMember(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	for _, testCase := range []struct {
+		OrgID          int64
+		UserID         int64
+		ExpectedMember bool
+	}{
+		{3, 2, true},
+		{3, 4, true},
+		{3, 1, false},
+		{3, 3, false},
+		{2, 2, false}, // user2 is not an organization
+		{2, 3, false},
+	} {
+		org := unittest.AssertExistsAndLoadBean(t, &organization.Organization{ID: testCase.OrgID})
+		isMember, err := org.IsOrgMember(db.DefaultContext, testCase.UserID)
+		require.NoError(t, err)
+		assert.Equal(t, testCase.ExpectedMember, isMember)
+	}
+}
+
+func TestUser_GetTeam(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	org := unittest.AssertExistsAndLoadBean(t, &organization.Organization{ID: 3})
+	team, err := org.GetTeam(db.DefaultContext, "team1")
+	require.NoError(t, err)
+	assert.Equal(t, org.ID, team.OrgID)
+	assert.Equal(t, "team1", team.LowerName)
+
+	_, err = org.GetTeam(db.DefaultContext, "does not exist")
+	assert.True(t, organization.IsErrTeamNotExist(err))
+
+	nonOrg := unittest.AssertExistsAndLoadBean(t, &organization.Organization{ID: 2})
+	_, err = nonOrg.GetTeam(db.DefaultContext, "team")
+	assert.True(t, organization.IsErrTeamNotExist(err))
+}
+
+func TestUser_GetOwnerTeam(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	org := unittest.AssertExistsAndLoadBean(t, &organization.Organization{ID: 3})
+	team, err := org.GetOwnerTeam(db.DefaultContext)
+	require.NoError(t, err)
+	assert.Equal(t, org.ID, team.OrgID)
+
+	nonOrg := unittest.AssertExistsAndLoadBean(t, &organization.Organization{ID: 2})
+	_, err = nonOrg.GetOwnerTeam(db.DefaultContext)
+	assert.True(t, organization.IsErrTeamNotExist(err))
+}
+
+func TestUser_GetTeams(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	org := unittest.AssertExistsAndLoadBean(t, &organization.Organization{ID: 3})
+	teams, err := org.LoadTeams(db.DefaultContext)
+	require.NoError(t, err)
+	if assert.Len(t, teams, 5) {
+		assert.Equal(t, int64(1), teams[0].ID)
+		assert.Equal(t, int64(2), teams[1].ID)
+		assert.Equal(t, int64(12), teams[2].ID)
+		assert.Equal(t, int64(14), teams[3].ID)
+		assert.Equal(t, int64(7), teams[4].ID)
+	}
+}
+
+func TestUser_GetMembers(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	org := unittest.AssertExistsAndLoadBean(t, &organization.Organization{ID: 3})
+	members, _, err := org.GetMembers(db.DefaultContext)
+	require.NoError(t, err)
+	if assert.Len(t, members, 3) {
+		assert.Equal(t, int64(2), members[0].ID)
+		assert.Equal(t, int64(28), members[1].ID)
+		assert.Equal(t, int64(4), members[2].ID)
+	}
+}
+
+func TestGetOrgByName(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	org, err := organization.GetOrgByName(db.DefaultContext, "org3")
+	require.NoError(t, err)
+	assert.EqualValues(t, 3, org.ID)
+	assert.Equal(t, "org3", org.Name)
+
+	_, err = organization.GetOrgByName(db.DefaultContext, "user2") // user2 is an individual
+	assert.True(t, organization.IsErrOrgNotExist(err))
+
+	_, err = organization.GetOrgByName(db.DefaultContext, "") // corner case
+	assert.True(t, organization.IsErrOrgNotExist(err))
+}
+
+func TestCountOrganizations(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	expected, err := db.GetEngine(db.DefaultContext).Where("type=?", user_model.UserTypeOrganization).Count(&organization.Organization{})
+	require.NoError(t, err)
+	cnt, err := db.Count[organization.Organization](db.DefaultContext, organization.FindOrgOptions{IncludePrivate: true})
+	require.NoError(t, err)
+	assert.Equal(t, expected, cnt)
+}
+
+func TestIsOrganizationOwner(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	test := func(orgID, userID int64, expected bool) {
+		isOwner, err := organization.IsOrganizationOwner(db.DefaultContext, orgID, userID)
+		require.NoError(t, err)
+		assert.EqualValues(t, expected, isOwner)
+	}
+	test(3, 2, true)
+	test(3, 3, false)
+	test(6, 5, true)
+	test(6, 4, false)
+	test(unittest.NonexistentID, unittest.NonexistentID, false)
+}
+
+func TestIsOrganizationMember(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	test := func(orgID, userID int64, expected bool) {
+		isMember, err := organization.IsOrganizationMember(db.DefaultContext, orgID, userID)
+		require.NoError(t, err)
+		assert.EqualValues(t, expected, isMember)
+	}
+	test(3, 2, true)
+	test(3, 3, false)
+	test(3, 4, true)
+	test(6, 5, true)
+	test(6, 4, false)
+	test(unittest.NonexistentID, unittest.NonexistentID, false)
+}
+
+func TestIsPublicMembership(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	test := func(orgID, userID int64, expected bool) {
+		isMember, err := organization.IsPublicMembership(db.DefaultContext, orgID, userID)
+		require.NoError(t, err)
+		assert.EqualValues(t, expected, isMember)
+	}
+	test(3, 2, true)
+	test(3, 3, false)
+	test(3, 4, false)
+	test(6, 5, true)
+	test(6, 4, false)
+	test(unittest.NonexistentID, unittest.NonexistentID, false)
+}
+
+func TestFindOrgs(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	orgs, err := db.Find[organization.Organization](db.DefaultContext, organization.FindOrgOptions{
+		UserID:         4,
+		IncludePrivate: true,
+	})
+	require.NoError(t, err)
+	if assert.Len(t, orgs, 1) {
+		assert.EqualValues(t, 3, orgs[0].ID)
+	}
+
+	orgs, err = db.Find[organization.Organization](db.DefaultContext, organization.FindOrgOptions{
+		UserID:         4,
+		IncludePrivate: false,
+	})
+	require.NoError(t, err)
+	assert.Empty(t, orgs)
+
+	total, err := db.Count[organization.Organization](db.DefaultContext, organization.FindOrgOptions{
+		UserID:         4,
+		IncludePrivate: true,
+	})
+	require.NoError(t, err)
+	assert.EqualValues(t, 1, total)
+}
+
+func TestGetOrgUsersByOrgID(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	orgUsers, err := organization.GetOrgUsersByOrgID(db.DefaultContext, &organization.FindOrgMembersOpts{
+		ListOptions: db.ListOptions{},
+		OrgID:       3,
+		PublicOnly:  false,
+	})
+	require.NoError(t, err)
+	if assert.Len(t, orgUsers, 3) {
+		assert.Equal(t, organization.OrgUser{
+			ID:       orgUsers[0].ID,
+			OrgID:    3,
+			UID:      2,
+			IsPublic: true,
+		}, *orgUsers[0])
+		assert.Equal(t, organization.OrgUser{
+			ID:       orgUsers[1].ID,
+			OrgID:    3,
+			UID:      4,
+			IsPublic: false,
+		}, *orgUsers[1])
+		assert.Equal(t, organization.OrgUser{
+			ID:       orgUsers[2].ID,
+			OrgID:    3,
+			UID:      28,
+			IsPublic: true,
+		}, *orgUsers[2])
+	}
+
+	orgUsers, err = organization.GetOrgUsersByOrgID(db.DefaultContext, &organization.FindOrgMembersOpts{
+		ListOptions: db.ListOptions{},
+		OrgID:       unittest.NonexistentID,
+		PublicOnly:  false,
+	})
+	require.NoError(t, err)
+	assert.Empty(t, orgUsers)
+}
+
+func TestChangeOrgUserStatus(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	testSuccess := func(orgID, userID int64, public bool) {
+		require.NoError(t, organization.ChangeOrgUserStatus(db.DefaultContext, orgID, userID, public))
+		orgUser := unittest.AssertExistsAndLoadBean(t, &organization.OrgUser{OrgID: orgID, UID: userID})
+		assert.Equal(t, public, orgUser.IsPublic)
+	}
+
+	testSuccess(3, 2, false)
+	testSuccess(3, 2, false)
+	testSuccess(3, 4, true)
+	require.NoError(t, organization.ChangeOrgUserStatus(db.DefaultContext, unittest.NonexistentID, unittest.NonexistentID, true))
+}
+
+func TestUser_GetUserTeamIDs(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	org := unittest.AssertExistsAndLoadBean(t, &organization.Organization{ID: 3})
+	testSuccess := func(userID int64, expected []int64) {
+		teamIDs, err := org.GetUserTeamIDs(db.DefaultContext, userID)
+		require.NoError(t, err)
+		assert.Equal(t, expected, teamIDs)
+	}
+	testSuccess(2, []int64{1, 2, 14})
+	testSuccess(4, []int64{2})
+	testSuccess(unittest.NonexistentID, []int64{})
+}
+
+func TestAccessibleReposEnv_CountRepos(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	org := unittest.AssertExistsAndLoadBean(t, &organization.Organization{ID: 3})
+	testSuccess := func(userID, expectedCount int64) {
+		env, err := organization.AccessibleReposEnv(db.DefaultContext, org, userID)
+		require.NoError(t, err)
+		count, err := env.CountRepos()
+		require.NoError(t, err)
+		assert.EqualValues(t, expectedCount, count)
+	}
+	testSuccess(2, 3)
+	testSuccess(4, 2)
+}
+
+func TestAccessibleReposEnv_RepoIDs(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	org := unittest.AssertExistsAndLoadBean(t, &organization.Organization{ID: 3})
+	testSuccess := func(userID int64, expectedRepoIDs []int64) {
+		env, err := organization.AccessibleReposEnv(db.DefaultContext, org, userID)
+		require.NoError(t, err)
+		repoIDs, err := env.RepoIDs(1, 100)
+		require.NoError(t, err)
+		assert.Equal(t, expectedRepoIDs, repoIDs)
+	}
+	testSuccess(2, []int64{3, 5, 32})
+	testSuccess(4, []int64{3, 32})
+}
+
+func TestAccessibleReposEnv_Repos(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	org := unittest.AssertExistsAndLoadBean(t, &organization.Organization{ID: 3})
+	testSuccess := func(userID int64, expectedRepoIDs []int64) {
+		env, err := organization.AccessibleReposEnv(db.DefaultContext, org, userID)
+		require.NoError(t, err)
+		repos, err := env.Repos(1, 100)
+		require.NoError(t, err)
+		expectedRepos := make(repo_model.RepositoryList, len(expectedRepoIDs))
+		for i, repoID := range expectedRepoIDs {
+			expectedRepos[i] = unittest.AssertExistsAndLoadBean(t,
+				&repo_model.Repository{ID: repoID})
+		}
+		assert.Equal(t, expectedRepos, repos)
+	}
+	testSuccess(2, []int64{3, 5, 32})
+	testSuccess(4, []int64{3, 32})
+}
+
+func TestAccessibleReposEnv_MirrorRepos(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	org := unittest.AssertExistsAndLoadBean(t, &organization.Organization{ID: 3})
+	testSuccess := func(userID int64, expectedRepoIDs []int64) {
+		env, err := organization.AccessibleReposEnv(db.DefaultContext, org, userID)
+		require.NoError(t, err)
+		repos, err := env.MirrorRepos()
+		require.NoError(t, err)
+		expectedRepos := make(repo_model.RepositoryList, len(expectedRepoIDs))
+		for i, repoID := range expectedRepoIDs {
+			expectedRepos[i] = unittest.AssertExistsAndLoadBean(t,
+				&repo_model.Repository{ID: repoID})
+		}
+		assert.Equal(t, expectedRepos, repos)
+	}
+	testSuccess(2, []int64{5})
+	testSuccess(4, []int64{})
+}
+
+func TestHasOrgVisibleTypePublic(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	owner := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+	org3 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 3})
+
+	const newOrgName = "test-org-public"
+	org := &organization.Organization{
+		Name:       newOrgName,
+		Visibility: structs.VisibleTypePublic,
+	}
+
+	unittest.AssertNotExistsBean(t, &user_model.User{Name: org.Name, Type: user_model.UserTypeOrganization})
+	require.NoError(t, organization.CreateOrganization(db.DefaultContext, org, owner))
+	org = unittest.AssertExistsAndLoadBean(t,
+		&organization.Organization{Name: org.Name, Type: user_model.UserTypeOrganization})
+	test1 := organization.HasOrgOrUserVisible(db.DefaultContext, org.AsUser(), owner)
+	test2 := organization.HasOrgOrUserVisible(db.DefaultContext, org.AsUser(), org3)
+	test3 := organization.HasOrgOrUserVisible(db.DefaultContext, org.AsUser(), nil)
+	assert.True(t, test1) // owner of org
+	assert.True(t, test2) // user not a part of org
+	assert.True(t, test3) // logged out user
+}
+
+func TestHasOrgVisibleTypeLimited(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	owner := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+	org3 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 3})
+
+	const newOrgName = "test-org-limited"
+	org := &organization.Organization{
+		Name:       newOrgName,
+		Visibility: structs.VisibleTypeLimited,
+	}
+
+	unittest.AssertNotExistsBean(t, &user_model.User{Name: org.Name, Type: user_model.UserTypeOrganization})
+	require.NoError(t, organization.CreateOrganization(db.DefaultContext, org, owner))
+	org = unittest.AssertExistsAndLoadBean(t,
+		&organization.Organization{Name: org.Name, Type: user_model.UserTypeOrganization})
+	test1 := organization.HasOrgOrUserVisible(db.DefaultContext, org.AsUser(), owner)
+	test2 := organization.HasOrgOrUserVisible(db.DefaultContext, org.AsUser(), org3)
+	test3 := organization.HasOrgOrUserVisible(db.DefaultContext, org.AsUser(), nil)
+	assert.True(t, test1)  // owner of org
+	assert.True(t, test2)  // user not a part of org
+	assert.False(t, test3) // logged out user
+}
+
+func TestHasOrgVisibleTypePrivate(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	owner := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+	org3 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 3})
+
+	const newOrgName = "test-org-private"
+	org := &organization.Organization{
+		Name:       newOrgName,
+		Visibility: structs.VisibleTypePrivate,
+	}
+
+	unittest.AssertNotExistsBean(t, &user_model.User{Name: org.Name, Type: user_model.UserTypeOrganization})
+	require.NoError(t, organization.CreateOrganization(db.DefaultContext, org, owner))
+	org = unittest.AssertExistsAndLoadBean(t,
+		&organization.Organization{Name: org.Name, Type: user_model.UserTypeOrganization})
+	test1 := organization.HasOrgOrUserVisible(db.DefaultContext, org.AsUser(), owner)
+	test2 := organization.HasOrgOrUserVisible(db.DefaultContext, org.AsUser(), org3)
+	test3 := organization.HasOrgOrUserVisible(db.DefaultContext, org.AsUser(), nil)
+	assert.True(t, test1)  // owner of org
+	assert.False(t, test2) // user not a part of org
+	assert.False(t, test3) // logged out user
+}
+
+func TestGetUsersWhoCanCreateOrgRepo(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	users, err := organization.GetUsersWhoCanCreateOrgRepo(db.DefaultContext, 3)
+	require.NoError(t, err)
+	assert.Len(t, users, 2)
+	var ids []int64
+	for i := range users {
+		ids = append(ids, users[i].ID)
+	}
+	assert.ElementsMatch(t, ids, []int64{2, 28})
+
+	users, err = organization.GetUsersWhoCanCreateOrgRepo(db.DefaultContext, 7)
+	require.NoError(t, err)
+	assert.Len(t, users, 1)
+	assert.NotNil(t, users[5])
+}
+
+func TestUser_RemoveOrgRepo(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	org := unittest.AssertExistsAndLoadBean(t, &organization.Organization{ID: 3})
+	repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{OwnerID: org.ID})
+
+	// remove a repo that does belong to org
+	unittest.AssertExistsAndLoadBean(t, &organization.TeamRepo{RepoID: repo.ID, OrgID: org.ID})
+	require.NoError(t, organization.RemoveOrgRepo(db.DefaultContext, org.ID, repo.ID))
+	unittest.AssertNotExistsBean(t, &organization.TeamRepo{RepoID: repo.ID, OrgID: org.ID})
+	unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: repo.ID}) // repo should still exist
+
+	// remove a repo that does not belong to org
+	require.NoError(t, organization.RemoveOrgRepo(db.DefaultContext, org.ID, repo.ID))
+	unittest.AssertNotExistsBean(t, &organization.TeamRepo{RepoID: repo.ID, OrgID: org.ID})
+
+	require.NoError(t, organization.RemoveOrgRepo(db.DefaultContext, org.ID, unittest.NonexistentID))
+
+	unittest.CheckConsistencyFor(t,
+		&user_model.User{ID: org.ID},
+		&organization.Team{OrgID: org.ID},
+		&repo_model.Repository{ID: repo.ID})
+}
+
+func TestCreateOrganization(t *testing.T) {
+	// successful creation of org
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	owner := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+	const newOrgName = "neworg"
+	org := &organization.Organization{
+		Name: newOrgName,
+	}
+
+	unittest.AssertNotExistsBean(t, &user_model.User{Name: newOrgName, Type: user_model.UserTypeOrganization})
+	require.NoError(t, organization.CreateOrganization(db.DefaultContext, org, owner))
+	org = unittest.AssertExistsAndLoadBean(t,
+		&organization.Organization{Name: newOrgName, Type: user_model.UserTypeOrganization})
+	ownerTeam := unittest.AssertExistsAndLoadBean(t,
+		&organization.Team{Name: organization.OwnerTeamName, OrgID: org.ID})
+	unittest.AssertExistsAndLoadBean(t, &organization.TeamUser{UID: owner.ID, TeamID: ownerTeam.ID})
+	unittest.CheckConsistencyFor(t, &user_model.User{}, &organization.Team{})
+}
+
+func TestCreateOrganization2(t *testing.T) {
+	// unauthorized creation of org
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	owner := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 5})
+	const newOrgName = "neworg"
+	org := &organization.Organization{
+		Name: newOrgName,
+	}
+
+	unittest.AssertNotExistsBean(t, &organization.Organization{Name: newOrgName, Type: user_model.UserTypeOrganization})
+	err := organization.CreateOrganization(db.DefaultContext, org, owner)
+	require.Error(t, err)
+	assert.True(t, organization.IsErrUserNotAllowedCreateOrg(err))
+	unittest.AssertNotExistsBean(t, &organization.Organization{Name: newOrgName, Type: user_model.UserTypeOrganization})
+	unittest.CheckConsistencyFor(t, &organization.Organization{}, &organization.Team{})
+}
+
+func TestCreateOrganization3(t *testing.T) {
+	// create org with same name as existent org
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	owner := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+	org := &organization.Organization{Name: "org3"}                       // should already exist
+	unittest.AssertExistsAndLoadBean(t, &user_model.User{Name: org.Name}) // sanity check
+	err := organization.CreateOrganization(db.DefaultContext, org, owner)
+	require.Error(t, err)
+	assert.True(t, user_model.IsErrUserAlreadyExist(err))
+	unittest.CheckConsistencyFor(t, &user_model.User{}, &organization.Team{})
+}
+
+func TestCreateOrganization4(t *testing.T) {
+	// create org with unusable name
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	owner := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+	err := organization.CreateOrganization(db.DefaultContext, &organization.Organization{Name: "assets"}, owner)
+	require.Error(t, err)
+	assert.True(t, db.IsErrNameReserved(err))
+	unittest.CheckConsistencyFor(t, &organization.Organization{}, &organization.Team{})
+}
diff --git a/models/organization/org_user.go b/models/organization/org_user.go
new file mode 100644
index 0000000..5fe3a17
--- /dev/null
+++ b/models/organization/org_user.go
@@ -0,0 +1,138 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package organization
+
+import (
+	"context"
+	"fmt"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/perm"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/log"
+
+	"xorm.io/builder"
+)
+
+// ________                ____ ___
+// \_____  \_______  ____ |    |   \______ ___________
+//  /   |   \_  __ \/ ___\|    |   /  ___// __ \_  __ \
+// /    |    \  | \/ /_/  >    |  /\___ \\  ___/|  | \/
+// \_______  /__|  \___  /|______//____  >\___  >__|
+//         \/     /_____/              \/     \/
+
+// OrgUser represents an organization-user relation.
+type OrgUser struct {
+	ID       int64 `xorm:"pk autoincr"`
+	UID      int64 `xorm:"INDEX UNIQUE(s)"`
+	OrgID    int64 `xorm:"INDEX UNIQUE(s)"`
+	IsPublic bool  `xorm:"INDEX"`
+}
+
+func init() {
+	db.RegisterModel(new(OrgUser))
+}
+
+// GetOrganizationCount returns count of membership of organization of the user.
+func GetOrganizationCount(ctx context.Context, u *user_model.User) (int64, error) {
+	return db.GetEngine(ctx).
+		Where("uid=?", u.ID).
+		Count(new(OrgUser))
+}
+
+// IsOrganizationOwner returns true if given user is in the owner team.
+func IsOrganizationOwner(ctx context.Context, orgID, uid int64) (bool, error) {
+	ownerTeam, err := GetOwnerTeam(ctx, orgID)
+	if err != nil {
+		if IsErrTeamNotExist(err) {
+			log.Error("Organization does not have owner team: %d", orgID)
+			return false, nil
+		}
+		return false, err
+	}
+	return IsTeamMember(ctx, orgID, ownerTeam.ID, uid)
+}
+
+// IsOrganizationAdmin returns true if given user is in the owner team or an admin team.
+func IsOrganizationAdmin(ctx context.Context, orgID, uid int64) (bool, error) {
+	teams, err := GetUserOrgTeams(ctx, orgID, uid)
+	if err != nil {
+		return false, err
+	}
+	for _, t := range teams {
+		if t.AccessMode >= perm.AccessModeAdmin {
+			return true, nil
+		}
+	}
+	return false, nil
+}
+
+// IsOrganizationMember returns true if given user is member of organization.
+func IsOrganizationMember(ctx context.Context, orgID, uid int64) (bool, error) {
+	return db.GetEngine(ctx).
+		Where("uid=?", uid).
+		And("org_id=?", orgID).
+		Table("org_user").
+		Exist()
+}
+
+// IsPublicMembership returns true if the given user's membership of given org is public.
+func IsPublicMembership(ctx context.Context, orgID, uid int64) (bool, error) {
+	return db.GetEngine(ctx).
+		Where("uid=?", uid).
+		And("org_id=?", orgID).
+		And("is_public=?", true).
+		Table("org_user").
+		Exist()
+}
+
+// CanCreateOrgRepo returns true if user can create repo in organization
+func CanCreateOrgRepo(ctx context.Context, orgID, uid int64) (bool, error) {
+	return db.GetEngine(ctx).
+		Where(builder.Eq{"team.can_create_org_repo": true}).
+		Join("INNER", "team_user", "team_user.team_id = team.id").
+		And("team_user.uid = ?", uid).
+		And("team_user.org_id = ?", orgID).
+		Exist(new(Team))
+}
+
+// IsUserOrgOwner returns true if user is in the owner team of given organization.
+func IsUserOrgOwner(ctx context.Context, users user_model.UserList, orgID int64) map[int64]bool {
+	results := make(map[int64]bool, len(users))
+	for _, user := range users {
+		results[user.ID] = false // Set default to false
+	}
+	ownerMaps, err := loadOrganizationOwners(ctx, users, orgID)
+	if err == nil {
+		for _, owner := range ownerMaps {
+			results[owner.UID] = true
+		}
+	}
+	return results
+}
+
+func loadOrganizationOwners(ctx context.Context, users user_model.UserList, orgID int64) (map[int64]*TeamUser, error) {
+	if len(users) == 0 {
+		return nil, nil
+	}
+	ownerTeam, err := GetOwnerTeam(ctx, orgID)
+	if err != nil {
+		if IsErrTeamNotExist(err) {
+			log.Error("Organization does not have owner team: %d", orgID)
+			return nil, nil
+		}
+		return nil, err
+	}
+
+	userIDs := users.GetUserIDs()
+	ownerMaps := make(map[int64]*TeamUser)
+	err = db.GetEngine(ctx).In("uid", userIDs).
+		And("org_id=?", orgID).
+		And("team_id=?", ownerTeam.ID).
+		Find(&ownerMaps)
+	if err != nil {
+		return nil, fmt.Errorf("find team users: %w", err)
+	}
+	return ownerMaps, nil
+}
diff --git a/models/organization/org_user_test.go b/models/organization/org_user_test.go
new file mode 100644
index 0000000..07d07ce
--- /dev/null
+++ b/models/organization/org_user_test.go
@@ -0,0 +1,155 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package organization_test
+
+import (
+	"fmt"
+	"testing"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/organization"
+	"code.gitea.io/gitea/models/unittest"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/setting"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestUserIsPublicMember(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	tt := []struct {
+		uid      int64
+		orgid    int64
+		expected bool
+	}{
+		{2, 3, true},
+		{4, 3, false},
+		{5, 6, true},
+		{5, 7, false},
+	}
+	for _, v := range tt {
+		t.Run(fmt.Sprintf("UserId%dIsPublicMemberOf%d", v.uid, v.orgid), func(t *testing.T) {
+			testUserIsPublicMember(t, v.uid, v.orgid, v.expected)
+		})
+	}
+}
+
+func testUserIsPublicMember(t *testing.T, uid, orgID int64, expected bool) {
+	user, err := user_model.GetUserByID(db.DefaultContext, uid)
+	require.NoError(t, err)
+	is, err := organization.IsPublicMembership(db.DefaultContext, orgID, user.ID)
+	require.NoError(t, err)
+	assert.Equal(t, expected, is)
+}
+
+func TestIsUserOrgOwner(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	tt := []struct {
+		uid      int64
+		orgid    int64
+		expected bool
+	}{
+		{2, 3, true},
+		{4, 3, false},
+		{5, 6, true},
+		{5, 7, true},
+	}
+	for _, v := range tt {
+		t.Run(fmt.Sprintf("UserId%dIsOrgOwnerOf%d", v.uid, v.orgid), func(t *testing.T) {
+			testIsUserOrgOwner(t, v.uid, v.orgid, v.expected)
+		})
+	}
+}
+
+func testIsUserOrgOwner(t *testing.T, uid, orgID int64, expected bool) {
+	user, err := user_model.GetUserByID(db.DefaultContext, uid)
+	require.NoError(t, err)
+	is, err := organization.IsOrganizationOwner(db.DefaultContext, orgID, user.ID)
+	require.NoError(t, err)
+	assert.Equal(t, expected, is)
+}
+
+func TestUserListIsPublicMember(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	tt := []struct {
+		orgid    int64
+		expected map[int64]bool
+	}{
+		{3, map[int64]bool{2: true, 4: false, 28: true}},
+		{6, map[int64]bool{5: true, 28: true}},
+		{7, map[int64]bool{5: false}},
+		{25, map[int64]bool{24: true}},
+		{22, map[int64]bool{}},
+	}
+	for _, v := range tt {
+		t.Run(fmt.Sprintf("IsPublicMemberOfOrgId%d", v.orgid), func(t *testing.T) {
+			testUserListIsPublicMember(t, v.orgid, v.expected)
+		})
+	}
+}
+
+func testUserListIsPublicMember(t *testing.T, orgID int64, expected map[int64]bool) {
+	org, err := organization.GetOrgByID(db.DefaultContext, orgID)
+	require.NoError(t, err)
+	_, membersIsPublic, err := org.GetMembers(db.DefaultContext)
+	require.NoError(t, err)
+	assert.Equal(t, expected, membersIsPublic)
+}
+
+func TestUserListIsUserOrgOwner(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	tt := []struct {
+		orgid    int64
+		expected map[int64]bool
+	}{
+		{3, map[int64]bool{2: true, 4: false, 28: false}},
+		{6, map[int64]bool{5: true, 28: false}},
+		{7, map[int64]bool{5: true}},
+		{25, map[int64]bool{24: false}}, // ErrTeamNotExist
+		{22, map[int64]bool{}},          // No member
+	}
+	for _, v := range tt {
+		t.Run(fmt.Sprintf("IsUserOrgOwnerOfOrgId%d", v.orgid), func(t *testing.T) {
+			testUserListIsUserOrgOwner(t, v.orgid, v.expected)
+		})
+	}
+}
+
+func testUserListIsUserOrgOwner(t *testing.T, orgID int64, expected map[int64]bool) {
+	org, err := organization.GetOrgByID(db.DefaultContext, orgID)
+	require.NoError(t, err)
+	members, _, err := org.GetMembers(db.DefaultContext)
+	require.NoError(t, err)
+	assert.Equal(t, expected, organization.IsUserOrgOwner(db.DefaultContext, members, orgID))
+}
+
+func TestAddOrgUser(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	testSuccess := func(orgID, userID int64, isPublic bool) {
+		org := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: orgID})
+		expectedNumMembers := org.NumMembers
+		if !unittest.BeanExists(t, &organization.OrgUser{OrgID: orgID, UID: userID}) {
+			expectedNumMembers++
+		}
+		require.NoError(t, organization.AddOrgUser(db.DefaultContext, orgID, userID))
+		ou := &organization.OrgUser{OrgID: orgID, UID: userID}
+		unittest.AssertExistsAndLoadBean(t, ou)
+		assert.Equal(t, isPublic, ou.IsPublic)
+		org = unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: orgID})
+		assert.EqualValues(t, expectedNumMembers, org.NumMembers)
+	}
+
+	setting.Service.DefaultOrgMemberVisible = false
+	testSuccess(3, 5, false)
+	testSuccess(3, 5, false)
+	testSuccess(6, 2, false)
+
+	setting.Service.DefaultOrgMemberVisible = true
+	testSuccess(6, 3, true)
+
+	unittest.CheckConsistencyFor(t, &user_model.User{}, &organization.Team{})
+}
diff --git a/models/organization/team.go b/models/organization/team.go
new file mode 100644
index 0000000..ddff32c
--- /dev/null
+++ b/models/organization/team.go
@@ -0,0 +1,310 @@
+// Copyright 2018 The Gitea Authors. All rights reserved.
+// Copyright 2016 The Gogs Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package organization
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/perm"
+	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/models/unit"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/util"
+
+	"xorm.io/builder"
+)
+
+// ___________
+// \__    ___/___ _____    _____
+//   |    |_/ __ \\__  \  /     \
+//   |    |\  ___/ / __ \|  Y Y  \
+//   |____| \___  >____  /__|_|  /
+//              \/     \/      \/
+
+// ErrTeamAlreadyExist represents a "TeamAlreadyExist" kind of error.
+type ErrTeamAlreadyExist struct {
+	OrgID int64
+	Name  string
+}
+
+// IsErrTeamAlreadyExist checks if an error is a ErrTeamAlreadyExist.
+func IsErrTeamAlreadyExist(err error) bool {
+	_, ok := err.(ErrTeamAlreadyExist)
+	return ok
+}
+
+func (err ErrTeamAlreadyExist) Error() string {
+	return fmt.Sprintf("team already exists [org_id: %d, name: %s]", err.OrgID, err.Name)
+}
+
+func (err ErrTeamAlreadyExist) Unwrap() error {
+	return util.ErrAlreadyExist
+}
+
+// ErrTeamNotExist represents a "TeamNotExist" error
+type ErrTeamNotExist struct {
+	OrgID  int64
+	TeamID int64
+	Name   string
+}
+
+// IsErrTeamNotExist checks if an error is a ErrTeamNotExist.
+func IsErrTeamNotExist(err error) bool {
+	_, ok := err.(ErrTeamNotExist)
+	return ok
+}
+
+func (err ErrTeamNotExist) Error() string {
+	return fmt.Sprintf("team does not exist [org_id %d, team_id %d, name: %s]", err.OrgID, err.TeamID, err.Name)
+}
+
+func (err ErrTeamNotExist) Unwrap() error {
+	return util.ErrNotExist
+}
+
+// OwnerTeamName return the owner team name
+const OwnerTeamName = "Owners"
+
+// Team represents a organization team.
+type Team struct {
+	ID                      int64 `xorm:"pk autoincr"`
+	OrgID                   int64 `xorm:"INDEX"`
+	LowerName               string
+	Name                    string
+	Description             string
+	AccessMode              perm.AccessMode          `xorm:"'authorize'"`
+	Repos                   []*repo_model.Repository `xorm:"-"`
+	Members                 []*user_model.User       `xorm:"-"`
+	NumRepos                int
+	NumMembers              int
+	Units                   []*TeamUnit `xorm:"-"`
+	IncludesAllRepositories bool        `xorm:"NOT NULL DEFAULT false"`
+	CanCreateOrgRepo        bool        `xorm:"NOT NULL DEFAULT false"`
+}
+
+func init() {
+	db.RegisterModel(new(Team))
+	db.RegisterModel(new(TeamUser))
+	db.RegisterModel(new(TeamRepo))
+	db.RegisterModel(new(TeamUnit))
+	db.RegisterModel(new(TeamInvite))
+}
+
+func (t *Team) LogString() string {
+	if t == nil {
+		return "<Team nil>"
+	}
+	return fmt.Sprintf("<Team %d:%s OrgID=%d AccessMode=%s>", t.ID, t.Name, t.OrgID, t.AccessMode.LogString())
+}
+
+// LoadUnits load a list of available units for a team
+func (t *Team) LoadUnits(ctx context.Context) (err error) {
+	if t.Units != nil {
+		return nil
+	}
+
+	t.Units, err = getUnitsByTeamID(ctx, t.ID)
+	return err
+}
+
+// GetUnitNames returns the team units names
+func (t *Team) GetUnitNames() (res []string) {
+	if t.AccessMode >= perm.AccessModeAdmin {
+		return unit.AllUnitKeyNames()
+	}
+
+	for _, u := range t.Units {
+		res = append(res, unit.Units[u.Type].NameKey)
+	}
+	return res
+}
+
+// GetUnitsMap returns the team units permissions
+func (t *Team) GetUnitsMap() map[string]string {
+	m := make(map[string]string)
+	if t.AccessMode >= perm.AccessModeAdmin {
+		for _, u := range unit.Units {
+			m[u.NameKey] = t.AccessMode.String()
+		}
+	} else {
+		for _, u := range t.Units {
+			m[u.Unit().NameKey] = u.AccessMode.String()
+		}
+	}
+	return m
+}
+
+// IsOwnerTeam returns true if team is owner team.
+func (t *Team) IsOwnerTeam() bool {
+	return t.Name == OwnerTeamName
+}
+
+// IsMember returns true if given user is a member of team.
+func (t *Team) IsMember(ctx context.Context, userID int64) bool {
+	isMember, err := IsTeamMember(ctx, t.OrgID, t.ID, userID)
+	if err != nil {
+		log.Error("IsMember: %v", err)
+		return false
+	}
+	return isMember
+}
+
+// LoadRepositories returns paginated repositories in team of organization.
+func (t *Team) LoadRepositories(ctx context.Context) (err error) {
+	if t.Repos != nil {
+		return nil
+	}
+	t.Repos, err = GetTeamRepositories(ctx, &SearchTeamRepoOptions{
+		TeamID: t.ID,
+	})
+	return err
+}
+
+// LoadMembers returns paginated members in team of organization.
+func (t *Team) LoadMembers(ctx context.Context) (err error) {
+	t.Members, err = GetTeamMembers(ctx, &SearchMembersOptions{
+		TeamID: t.ID,
+	})
+	return err
+}
+
+// UnitEnabled returns if the team has the given unit type enabled
+func (t *Team) UnitEnabled(ctx context.Context, tp unit.Type) bool {
+	return t.UnitAccessMode(ctx, tp) > perm.AccessModeNone
+}
+
+// UnitAccessMode returns if the team has the given unit type enabled
+func (t *Team) UnitAccessMode(ctx context.Context, tp unit.Type) perm.AccessMode {
+	if err := t.LoadUnits(ctx); err != nil {
+		log.Warn("Error loading team (ID: %d) units: %s", t.ID, err.Error())
+	}
+
+	for _, unit := range t.Units {
+		if unit.Type == tp {
+			return unit.AccessMode
+		}
+	}
+	return perm.AccessModeNone
+}
+
+// IsUsableTeamName tests if a name could be as team name
+func IsUsableTeamName(name string) error {
+	switch name {
+	case "new":
+		return db.ErrNameReserved{Name: name}
+	default:
+		return nil
+	}
+}
+
+// GetTeam returns team by given team name and organization.
+func GetTeam(ctx context.Context, orgID int64, name string) (*Team, error) {
+	t, exist, err := db.Get[Team](ctx, builder.Eq{"org_id": orgID, "lower_name": strings.ToLower(name)})
+	if err != nil {
+		return nil, err
+	} else if !exist {
+		return nil, ErrTeamNotExist{orgID, 0, name}
+	}
+	return t, nil
+}
+
+// GetTeamIDsByNames returns a slice of team ids corresponds to names.
+func GetTeamIDsByNames(ctx context.Context, orgID int64, names []string, ignoreNonExistent bool) ([]int64, error) {
+	ids := make([]int64, 0, len(names))
+	for _, name := range names {
+		u, err := GetTeam(ctx, orgID, name)
+		if err != nil {
+			if ignoreNonExistent {
+				continue
+			}
+			return nil, err
+		}
+		ids = append(ids, u.ID)
+	}
+	return ids, nil
+}
+
+// GetOwnerTeam returns team by given team name and organization.
+func GetOwnerTeam(ctx context.Context, orgID int64) (*Team, error) {
+	return GetTeam(ctx, orgID, OwnerTeamName)
+}
+
+// GetTeamByID returns team by given ID.
+func GetTeamByID(ctx context.Context, teamID int64) (*Team, error) {
+	t := new(Team)
+	has, err := db.GetEngine(ctx).ID(teamID).Get(t)
+	if err != nil {
+		return nil, err
+	} else if !has {
+		return nil, ErrTeamNotExist{0, teamID, ""}
+	}
+	return t, nil
+}
+
+// GetTeamNamesByID returns team's lower name from a list of team ids.
+func GetTeamNamesByID(ctx context.Context, teamIDs []int64) ([]string, error) {
+	if len(teamIDs) == 0 {
+		return []string{}, nil
+	}
+
+	var teamNames []string
+	err := db.GetEngine(ctx).Table("team").
+		Select("lower_name").
+		In("id", teamIDs).
+		Asc("name").
+		Find(&teamNames)
+
+	return teamNames, err
+}
+
+// IncrTeamRepoNum increases the number of repos for the given team by 1
+func IncrTeamRepoNum(ctx context.Context, teamID int64) error {
+	_, err := db.GetEngine(ctx).Incr("num_repos").ID(teamID).Update(new(Team))
+	return err
+}
+
+// CountInconsistentOwnerTeams returns the amount of owner teams that have all of
+// their access modes set to "None".
+func CountInconsistentOwnerTeams(ctx context.Context) (int64, error) {
+	return db.GetEngine(ctx).Table("team").
+		Join("INNER", "team_unit", "`team`.id = `team_unit`.team_id").
+		Where("`team`.lower_name = ?", strings.ToLower(OwnerTeamName)).
+		GroupBy("`team_unit`.team_id").
+		Having("SUM(`team_unit`.access_mode) = 0").
+		Count()
+}
+
+// FixInconsistentOwnerTeams fixes inconsistent owner teams that have all of
+// their access modes set to "None", it sets it back to "Owner".
+func FixInconsistentOwnerTeams(ctx context.Context) (int64, error) {
+	teamIDs := []int64{}
+	if err := db.GetEngine(ctx).Table("team").
+		Select("`team`.id").
+		Join("INNER", "team_unit", "`team`.id = `team_unit`.team_id").
+		Where("`team`.lower_name = ?", strings.ToLower(OwnerTeamName)).
+		GroupBy("`team_unit`.team_id").
+		Having("SUM(`team_unit`.access_mode) = 0").
+		Find(&teamIDs); err != nil {
+		return 0, err
+	}
+
+	if err := db.Iterate(ctx, builder.In("team_id", teamIDs), func(ctx context.Context, bean *TeamUnit) error {
+		if bean.Type == unit.TypeExternalTracker || bean.Type == unit.TypeExternalWiki {
+			bean.AccessMode = perm.AccessModeRead
+		} else {
+			bean.AccessMode = perm.AccessModeOwner
+		}
+		_, err := db.GetEngine(ctx).ID(bean.ID).Table("team_unit").Cols("access_mode").Update(bean)
+		return err
+	}); err != nil {
+		return 0, err
+	}
+
+	return int64(len(teamIDs)), nil
+}
diff --git a/models/organization/team_invite.go b/models/organization/team_invite.go
new file mode 100644
index 0000000..17f6c59
--- /dev/null
+++ b/models/organization/team_invite.go
@@ -0,0 +1,161 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package organization
+
+import (
+	"context"
+	"fmt"
+
+	"code.gitea.io/gitea/models/db"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/timeutil"
+	"code.gitea.io/gitea/modules/util"
+
+	"xorm.io/builder"
+)
+
+type ErrTeamInviteAlreadyExist struct {
+	TeamID int64
+	Email  string
+}
+
+func IsErrTeamInviteAlreadyExist(err error) bool {
+	_, ok := err.(ErrTeamInviteAlreadyExist)
+	return ok
+}
+
+func (err ErrTeamInviteAlreadyExist) Error() string {
+	return fmt.Sprintf("team invite already exists [team_id: %d, email: %s]", err.TeamID, err.Email)
+}
+
+func (err ErrTeamInviteAlreadyExist) Unwrap() error {
+	return util.ErrAlreadyExist
+}
+
+type ErrTeamInviteNotFound struct {
+	Token string
+}
+
+func IsErrTeamInviteNotFound(err error) bool {
+	_, ok := err.(ErrTeamInviteNotFound)
+	return ok
+}
+
+func (err ErrTeamInviteNotFound) Error() string {
+	return fmt.Sprintf("team invite was not found [token: %s]", err.Token)
+}
+
+func (err ErrTeamInviteNotFound) Unwrap() error {
+	return util.ErrNotExist
+}
+
+// ErrUserEmailAlreadyAdded represents a "user by email already added to team" error.
+type ErrUserEmailAlreadyAdded struct {
+	Email string
+}
+
+// IsErrUserEmailAlreadyAdded checks if an error is a ErrUserEmailAlreadyAdded.
+func IsErrUserEmailAlreadyAdded(err error) bool {
+	_, ok := err.(ErrUserEmailAlreadyAdded)
+	return ok
+}
+
+func (err ErrUserEmailAlreadyAdded) Error() string {
+	return fmt.Sprintf("user with email already added [email: %s]", err.Email)
+}
+
+func (err ErrUserEmailAlreadyAdded) Unwrap() error {
+	return util.ErrAlreadyExist
+}
+
+// TeamInvite represents an invite to a team
+type TeamInvite struct {
+	ID          int64              `xorm:"pk autoincr"`
+	Token       string             `xorm:"UNIQUE(token) INDEX NOT NULL DEFAULT ''"`
+	InviterID   int64              `xorm:"NOT NULL DEFAULT 0"`
+	OrgID       int64              `xorm:"INDEX NOT NULL DEFAULT 0"`
+	TeamID      int64              `xorm:"UNIQUE(team_mail) INDEX NOT NULL DEFAULT 0"`
+	Email       string             `xorm:"UNIQUE(team_mail) NOT NULL DEFAULT ''"`
+	CreatedUnix timeutil.TimeStamp `xorm:"INDEX created"`
+	UpdatedUnix timeutil.TimeStamp `xorm:"INDEX updated"`
+}
+
+func CreateTeamInvite(ctx context.Context, doer *user_model.User, team *Team, email string) (*TeamInvite, error) {
+	has, err := db.GetEngine(ctx).Exist(&TeamInvite{
+		TeamID: team.ID,
+		Email:  email,
+	})
+	if err != nil {
+		return nil, err
+	}
+	if has {
+		return nil, ErrTeamInviteAlreadyExist{
+			TeamID: team.ID,
+			Email:  email,
+		}
+	}
+
+	// check if the user is already a team member by email
+	exist, err := db.GetEngine(ctx).
+		Where(builder.Eq{
+			"team_user.org_id":  team.OrgID,
+			"team_user.team_id": team.ID,
+			"`user`.email":      email,
+		}).
+		Join("INNER", "`user`", "`user`.id = team_user.uid").
+		Table("team_user").
+		Exist()
+	if err != nil {
+		return nil, err
+	}
+
+	if exist {
+		return nil, ErrUserEmailAlreadyAdded{
+			Email: email,
+		}
+	}
+
+	token, err := util.CryptoRandomString(25)
+	if err != nil {
+		return nil, err
+	}
+
+	invite := &TeamInvite{
+		Token:     token,
+		InviterID: doer.ID,
+		OrgID:     team.OrgID,
+		TeamID:    team.ID,
+		Email:     email,
+	}
+
+	return invite, db.Insert(ctx, invite)
+}
+
+func RemoveInviteByID(ctx context.Context, inviteID, teamID int64) error {
+	_, err := db.DeleteByBean(ctx, &TeamInvite{
+		ID:     inviteID,
+		TeamID: teamID,
+	})
+	return err
+}
+
+func GetInvitesByTeamID(ctx context.Context, teamID int64) ([]*TeamInvite, error) {
+	invites := make([]*TeamInvite, 0, 10)
+	return invites, db.GetEngine(ctx).
+		Where("team_id=?", teamID).
+		Find(&invites)
+}
+
+func GetInviteByToken(ctx context.Context, token string) (*TeamInvite, error) {
+	invite := &TeamInvite{}
+
+	has, err := db.GetEngine(ctx).Where("token=?", token).Get(invite)
+	if err != nil {
+		return nil, err
+	}
+	if !has {
+		return nil, ErrTeamInviteNotFound{Token: token}
+	}
+	return invite, nil
+}
diff --git a/models/organization/team_invite_test.go b/models/organization/team_invite_test.go
new file mode 100644
index 0000000..cbabf79
--- /dev/null
+++ b/models/organization/team_invite_test.go
@@ -0,0 +1,49 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package organization_test
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/organization"
+	"code.gitea.io/gitea/models/unittest"
+	user_model "code.gitea.io/gitea/models/user"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestTeamInvite(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	team := unittest.AssertExistsAndLoadBean(t, &organization.Team{ID: 2})
+
+	t.Run("MailExistsInTeam", func(t *testing.T) {
+		user2 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+
+		// user 2 already added to team 2, should result in error
+		_, err := organization.CreateTeamInvite(db.DefaultContext, user2, team, user2.Email)
+		require.Error(t, err)
+	})
+
+	t.Run("CreateAndRemove", func(t *testing.T) {
+		user1 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1})
+
+		invite, err := organization.CreateTeamInvite(db.DefaultContext, user1, team, "org3@example.com")
+		assert.NotNil(t, invite)
+		require.NoError(t, err)
+
+		// Shouldn't allow duplicate invite
+		_, err = organization.CreateTeamInvite(db.DefaultContext, user1, team, "org3@example.com")
+		require.Error(t, err)
+
+		// should remove invite
+		require.NoError(t, organization.RemoveInviteByID(db.DefaultContext, invite.ID, invite.TeamID))
+
+		// invite should not exist
+		_, err = organization.GetInviteByToken(db.DefaultContext, invite.Token)
+		require.Error(t, err)
+	})
+}
diff --git a/models/organization/team_list.go b/models/organization/team_list.go
new file mode 100644
index 0000000..5b45429
--- /dev/null
+++ b/models/organization/team_list.go
@@ -0,0 +1,128 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package organization
+
+import (
+	"context"
+	"strings"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/perm"
+	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/models/unit"
+
+	"xorm.io/builder"
+)
+
+type TeamList []*Team
+
+func (t TeamList) LoadUnits(ctx context.Context) error {
+	for _, team := range t {
+		if err := team.LoadUnits(ctx); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (t TeamList) UnitMaxAccess(tp unit.Type) perm.AccessMode {
+	maxAccess := perm.AccessModeNone
+	for _, team := range t {
+		if team.IsOwnerTeam() {
+			return perm.AccessModeOwner
+		}
+		for _, teamUnit := range team.Units {
+			if teamUnit.Type != tp {
+				continue
+			}
+			if teamUnit.AccessMode > maxAccess {
+				maxAccess = teamUnit.AccessMode
+			}
+		}
+	}
+	return maxAccess
+}
+
+// SearchTeamOptions holds the search options
+type SearchTeamOptions struct {
+	db.ListOptions
+	UserID      int64
+	Keyword     string
+	OrgID       int64
+	IncludeDesc bool
+}
+
+func (opts *SearchTeamOptions) toCond() builder.Cond {
+	cond := builder.NewCond()
+
+	if len(opts.Keyword) > 0 {
+		lowerKeyword := strings.ToLower(opts.Keyword)
+		var keywordCond builder.Cond = builder.Like{"lower_name", lowerKeyword}
+		if opts.IncludeDesc {
+			keywordCond = keywordCond.Or(builder.Like{"LOWER(description)", lowerKeyword})
+		}
+		cond = cond.And(keywordCond)
+	}
+
+	if opts.OrgID > 0 {
+		cond = cond.And(builder.Eq{"`team`.org_id": opts.OrgID})
+	}
+
+	if opts.UserID > 0 {
+		cond = cond.And(builder.Eq{"team_user.uid": opts.UserID})
+	}
+
+	return cond
+}
+
+// SearchTeam search for teams. Caller is responsible to check permissions.
+func SearchTeam(ctx context.Context, opts *SearchTeamOptions) (TeamList, int64, error) {
+	sess := db.GetEngine(ctx)
+
+	opts.SetDefaultValues()
+	cond := opts.toCond()
+
+	if opts.UserID > 0 {
+		sess = sess.Join("INNER", "team_user", "team_user.team_id = team.id")
+	}
+	sess = db.SetSessionPagination(sess, opts)
+
+	teams := make([]*Team, 0, opts.PageSize)
+	count, err := sess.Where(cond).OrderBy("lower_name").FindAndCount(&teams)
+	if err != nil {
+		return nil, 0, err
+	}
+
+	return teams, count, nil
+}
+
+// GetRepoTeams gets the list of teams that has access to the repository
+func GetRepoTeams(ctx context.Context, repo *repo_model.Repository) (teams TeamList, err error) {
+	return teams, db.GetEngine(ctx).
+		Join("INNER", "team_repo", "team_repo.team_id = team.id").
+		Where("team.org_id = ?", repo.OwnerID).
+		And("team_repo.repo_id=?", repo.ID).
+		OrderBy("CASE WHEN name LIKE '" + OwnerTeamName + "' THEN '' ELSE name END").
+		Find(&teams)
+}
+
+// GetUserOrgTeams returns all teams that user belongs to in given organization.
+func GetUserOrgTeams(ctx context.Context, orgID, userID int64) (teams TeamList, err error) {
+	return teams, db.GetEngine(ctx).
+		Join("INNER", "team_user", "team_user.team_id = team.id").
+		Where("team.org_id = ?", orgID).
+		And("team_user.uid=?", userID).
+		Find(&teams)
+}
+
+// GetUserRepoTeams returns user repo's teams
+func GetUserRepoTeams(ctx context.Context, orgID, userID, repoID int64) (teams TeamList, err error) {
+	return teams, db.GetEngine(ctx).
+		Join("INNER", "team_user", "team_user.team_id = team.id").
+		Join("INNER", "team_repo", "team_repo.team_id = team.id").
+		Where("team.org_id = ?", orgID).
+		And("team_user.uid=?", userID).
+		And("team_repo.repo_id=?", repoID).
+		Find(&teams)
+}
diff --git a/models/organization/team_repo.go b/models/organization/team_repo.go
new file mode 100644
index 0000000..1184e39
--- /dev/null
+++ b/models/organization/team_repo.go
@@ -0,0 +1,85 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package organization
+
+import (
+	"context"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/perm"
+	repo_model "code.gitea.io/gitea/models/repo"
+
+	"xorm.io/builder"
+)
+
+// TeamRepo represents an team-repository relation.
+type TeamRepo struct {
+	ID     int64 `xorm:"pk autoincr"`
+	OrgID  int64 `xorm:"INDEX"`
+	TeamID int64 `xorm:"UNIQUE(s)"`
+	RepoID int64 `xorm:"UNIQUE(s)"`
+}
+
+// HasTeamRepo returns true if given repository belongs to team.
+func HasTeamRepo(ctx context.Context, orgID, teamID, repoID int64) bool {
+	has, _ := db.GetEngine(ctx).
+		Where("org_id=?", orgID).
+		And("team_id=?", teamID).
+		And("repo_id=?", repoID).
+		Get(new(TeamRepo))
+	return has
+}
+
+type SearchTeamRepoOptions struct {
+	db.ListOptions
+	TeamID int64
+}
+
+// GetRepositories returns paginated repositories in team of organization.
+func GetTeamRepositories(ctx context.Context, opts *SearchTeamRepoOptions) (repo_model.RepositoryList, error) {
+	sess := db.GetEngine(ctx)
+	if opts.TeamID > 0 {
+		sess = sess.In("id",
+			builder.Select("repo_id").
+				From("team_repo").
+				Where(builder.Eq{"team_id": opts.TeamID}),
+		)
+	}
+	if opts.PageSize > 0 {
+		sess.Limit(opts.PageSize, (opts.Page-1)*opts.PageSize)
+	}
+	var repos []*repo_model.Repository
+	return repos, sess.OrderBy("repository.name").
+		Find(&repos)
+}
+
+// AddTeamRepo adds a repo for an organization's team
+func AddTeamRepo(ctx context.Context, orgID, teamID, repoID int64) error {
+	_, err := db.GetEngine(ctx).Insert(&TeamRepo{
+		OrgID:  orgID,
+		TeamID: teamID,
+		RepoID: repoID,
+	})
+	return err
+}
+
+// RemoveTeamRepo remove repository from team
+func RemoveTeamRepo(ctx context.Context, teamID, repoID int64) error {
+	_, err := db.DeleteByBean(ctx, &TeamRepo{
+		TeamID: teamID,
+		RepoID: repoID,
+	})
+	return err
+}
+
+// GetTeamsWithAccessToRepo returns all teams in an organization that have given access level to the repository.
+func GetTeamsWithAccessToRepo(ctx context.Context, orgID, repoID int64, mode perm.AccessMode) ([]*Team, error) {
+	teams := make([]*Team, 0, 5)
+	return teams, db.GetEngine(ctx).Where("team.authorize >= ?", mode).
+		Join("INNER", "team_repo", "team_repo.team_id = team.id").
+		And("team_repo.org_id = ?", orgID).
+		And("team_repo.repo_id = ?", repoID).
+		OrderBy("name").
+		Find(&teams)
+}
diff --git a/models/organization/team_test.go b/models/organization/team_test.go
new file mode 100644
index 0000000..601d136
--- /dev/null
+++ b/models/organization/team_test.go
@@ -0,0 +1,250 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package organization_test
+
+import (
+	"path/filepath"
+	"testing"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/organization"
+	"code.gitea.io/gitea/models/perm"
+	"code.gitea.io/gitea/models/unittest"
+	"code.gitea.io/gitea/modules/setting"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestTeam_IsOwnerTeam(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	team := unittest.AssertExistsAndLoadBean(t, &organization.Team{ID: 1})
+	assert.True(t, team.IsOwnerTeam())
+
+	team = unittest.AssertExistsAndLoadBean(t, &organization.Team{ID: 2})
+	assert.False(t, team.IsOwnerTeam())
+}
+
+func TestTeam_IsMember(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	team := unittest.AssertExistsAndLoadBean(t, &organization.Team{ID: 1})
+	assert.True(t, team.IsMember(db.DefaultContext, 2))
+	assert.False(t, team.IsMember(db.DefaultContext, 4))
+	assert.False(t, team.IsMember(db.DefaultContext, unittest.NonexistentID))
+
+	team = unittest.AssertExistsAndLoadBean(t, &organization.Team{ID: 2})
+	assert.True(t, team.IsMember(db.DefaultContext, 2))
+	assert.True(t, team.IsMember(db.DefaultContext, 4))
+	assert.False(t, team.IsMember(db.DefaultContext, unittest.NonexistentID))
+}
+
+func TestTeam_GetRepositories(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	test := func(teamID int64) {
+		team := unittest.AssertExistsAndLoadBean(t, &organization.Team{ID: teamID})
+		require.NoError(t, team.LoadRepositories(db.DefaultContext))
+		assert.Len(t, team.Repos, team.NumRepos)
+		for _, repo := range team.Repos {
+			unittest.AssertExistsAndLoadBean(t, &organization.TeamRepo{TeamID: teamID, RepoID: repo.ID})
+		}
+	}
+	test(1)
+	test(3)
+}
+
+func TestTeam_GetMembers(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	test := func(teamID int64) {
+		team := unittest.AssertExistsAndLoadBean(t, &organization.Team{ID: teamID})
+		require.NoError(t, team.LoadMembers(db.DefaultContext))
+		assert.Len(t, team.Members, team.NumMembers)
+		for _, member := range team.Members {
+			unittest.AssertExistsAndLoadBean(t, &organization.TeamUser{UID: member.ID, TeamID: teamID})
+		}
+	}
+	test(1)
+	test(3)
+}
+
+func TestGetTeam(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	testSuccess := func(orgID int64, name string) {
+		team, err := organization.GetTeam(db.DefaultContext, orgID, name)
+		require.NoError(t, err)
+		assert.EqualValues(t, orgID, team.OrgID)
+		assert.Equal(t, name, team.Name)
+	}
+	testSuccess(3, "Owners")
+	testSuccess(3, "team1")
+
+	_, err := organization.GetTeam(db.DefaultContext, 3, "nonexistent")
+	require.Error(t, err)
+	_, err = organization.GetTeam(db.DefaultContext, unittest.NonexistentID, "Owners")
+	require.Error(t, err)
+}
+
+func TestGetTeamByID(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	testSuccess := func(teamID int64) {
+		team, err := organization.GetTeamByID(db.DefaultContext, teamID)
+		require.NoError(t, err)
+		assert.EqualValues(t, teamID, team.ID)
+	}
+	testSuccess(1)
+	testSuccess(2)
+	testSuccess(3)
+	testSuccess(4)
+
+	_, err := organization.GetTeamByID(db.DefaultContext, unittest.NonexistentID)
+	require.Error(t, err)
+}
+
+func TestIsTeamMember(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	test := func(orgID, teamID, userID int64, expected bool) {
+		isMember, err := organization.IsTeamMember(db.DefaultContext, orgID, teamID, userID)
+		require.NoError(t, err)
+		assert.Equal(t, expected, isMember)
+	}
+
+	test(3, 1, 2, true)
+	test(3, 1, 4, false)
+	test(3, 1, unittest.NonexistentID, false)
+
+	test(3, 2, 2, true)
+	test(3, 2, 4, true)
+
+	test(3, unittest.NonexistentID, unittest.NonexistentID, false)
+	test(unittest.NonexistentID, unittest.NonexistentID, unittest.NonexistentID, false)
+}
+
+func TestGetTeamMembers(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	test := func(teamID int64) {
+		team := unittest.AssertExistsAndLoadBean(t, &organization.Team{ID: teamID})
+		members, err := organization.GetTeamMembers(db.DefaultContext, &organization.SearchMembersOptions{
+			TeamID: teamID,
+		})
+		require.NoError(t, err)
+		assert.Len(t, members, team.NumMembers)
+		for _, member := range members {
+			unittest.AssertExistsAndLoadBean(t, &organization.TeamUser{UID: member.ID, TeamID: teamID})
+		}
+	}
+	test(1)
+	test(3)
+}
+
+func TestGetUserTeams(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	test := func(userID int64) {
+		teams, _, err := organization.SearchTeam(db.DefaultContext, &organization.SearchTeamOptions{UserID: userID})
+		require.NoError(t, err)
+		for _, team := range teams {
+			unittest.AssertExistsAndLoadBean(t, &organization.TeamUser{TeamID: team.ID, UID: userID})
+		}
+	}
+	test(2)
+	test(5)
+	test(unittest.NonexistentID)
+}
+
+func TestGetUserOrgTeams(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	test := func(orgID, userID int64) {
+		teams, err := organization.GetUserOrgTeams(db.DefaultContext, orgID, userID)
+		require.NoError(t, err)
+		for _, team := range teams {
+			assert.EqualValues(t, orgID, team.OrgID)
+			unittest.AssertExistsAndLoadBean(t, &organization.TeamUser{TeamID: team.ID, UID: userID})
+		}
+	}
+	test(3, 2)
+	test(3, 4)
+	test(3, unittest.NonexistentID)
+}
+
+func TestHasTeamRepo(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	test := func(teamID, repoID int64, expected bool) {
+		team := unittest.AssertExistsAndLoadBean(t, &organization.Team{ID: teamID})
+		assert.Equal(t, expected, organization.HasTeamRepo(db.DefaultContext, team.OrgID, teamID, repoID))
+	}
+	test(1, 1, false)
+	test(1, 3, true)
+	test(1, 5, true)
+	test(1, unittest.NonexistentID, false)
+
+	test(2, 3, true)
+	test(2, 5, false)
+}
+
+func TestUsersInTeamsCount(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	test := func(teamIDs, userIDs []int64, expected int64) {
+		count, err := organization.UsersInTeamsCount(db.DefaultContext, teamIDs, userIDs)
+		require.NoError(t, err)
+		assert.Equal(t, expected, count)
+	}
+
+	test([]int64{2}, []int64{1, 2, 3, 4}, 1)          // only userid 2
+	test([]int64{1, 2, 3, 4, 5}, []int64{2, 5}, 2)    // userid 2,4
+	test([]int64{1, 2, 3, 4, 5}, []int64{2, 3, 5}, 3) // userid 2,4,5
+}
+
+func TestInconsistentOwnerTeam(t *testing.T) {
+	defer unittest.OverrideFixtures(
+		unittest.FixturesOptions{
+			Dir:  filepath.Join(setting.AppWorkPath, "models/fixtures/"),
+			Base: setting.AppWorkPath,
+			Dirs: []string{"models/organization/TestInconsistentOwnerTeam/"},
+		},
+	)()
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	unittest.AssertExistsAndLoadBean(t, &organization.TeamUnit{ID: 1000, TeamID: 1000, AccessMode: perm.AccessModeNone})
+	unittest.AssertExistsAndLoadBean(t, &organization.TeamUnit{ID: 1001, TeamID: 1000, AccessMode: perm.AccessModeNone})
+	unittest.AssertExistsAndLoadBean(t, &organization.TeamUnit{ID: 1002, TeamID: 1000, AccessMode: perm.AccessModeNone})
+	unittest.AssertExistsAndLoadBean(t, &organization.TeamUnit{ID: 1003, TeamID: 1000, AccessMode: perm.AccessModeNone})
+	unittest.AssertExistsAndLoadBean(t, &organization.TeamUnit{ID: 1004, TeamID: 1000, AccessMode: perm.AccessModeNone})
+	unittest.AssertExistsAndLoadBean(t, &organization.TeamUnit{ID: 1005, TeamID: 1000, AccessMode: perm.AccessModeNone})
+	unittest.AssertExistsAndLoadBean(t, &organization.TeamUnit{ID: 1006, TeamID: 1000, AccessMode: perm.AccessModeNone})
+	unittest.AssertExistsAndLoadBean(t, &organization.TeamUnit{ID: 1007, TeamID: 1000, AccessMode: perm.AccessModeNone})
+	unittest.AssertExistsAndLoadBean(t, &organization.TeamUnit{ID: 1008, TeamID: 1000, AccessMode: perm.AccessModeNone})
+	unittest.AssertExistsAndLoadBean(t, &organization.TeamUnit{ID: 1009, TeamID: 1000, AccessMode: perm.AccessModeNone})
+
+	count, err := organization.CountInconsistentOwnerTeams(db.DefaultContext)
+	require.NoError(t, err)
+	require.EqualValues(t, 1, count)
+
+	count, err = organization.FixInconsistentOwnerTeams(db.DefaultContext)
+	require.NoError(t, err)
+	require.EqualValues(t, 1, count)
+
+	count, err = organization.CountInconsistentOwnerTeams(db.DefaultContext)
+	require.NoError(t, err)
+	require.EqualValues(t, 0, count)
+
+	unittest.AssertExistsAndLoadBean(t, &organization.TeamUnit{ID: 1000, AccessMode: perm.AccessModeOwner})
+	unittest.AssertExistsAndLoadBean(t, &organization.TeamUnit{ID: 1001, AccessMode: perm.AccessModeOwner})
+	unittest.AssertExistsAndLoadBean(t, &organization.TeamUnit{ID: 1002, AccessMode: perm.AccessModeOwner})
+	unittest.AssertExistsAndLoadBean(t, &organization.TeamUnit{ID: 1003, AccessMode: perm.AccessModeOwner})
+	unittest.AssertExistsAndLoadBean(t, &organization.TeamUnit{ID: 1004, AccessMode: perm.AccessModeOwner})
+	unittest.AssertExistsAndLoadBean(t, &organization.TeamUnit{ID: 1007, AccessMode: perm.AccessModeOwner})
+	unittest.AssertExistsAndLoadBean(t, &organization.TeamUnit{ID: 1008, AccessMode: perm.AccessModeOwner})
+	unittest.AssertExistsAndLoadBean(t, &organization.TeamUnit{ID: 1009, AccessMode: perm.AccessModeOwner})
+
+	// External wiki and issue
+	unittest.AssertExistsAndLoadBean(t, &organization.TeamUnit{ID: 1005, AccessMode: perm.AccessModeRead})
+	unittest.AssertExistsAndLoadBean(t, &organization.TeamUnit{ID: 1006, AccessMode: perm.AccessModeRead})
+}
diff --git a/models/organization/team_unit.go b/models/organization/team_unit.go
new file mode 100644
index 0000000..3087b70
--- /dev/null
+++ b/models/organization/team_unit.go
@@ -0,0 +1,51 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package organization
+
+import (
+	"context"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/perm"
+	"code.gitea.io/gitea/models/unit"
+)
+
+// TeamUnit describes all units of a repository
+type TeamUnit struct {
+	ID         int64     `xorm:"pk autoincr"`
+	OrgID      int64     `xorm:"INDEX"`
+	TeamID     int64     `xorm:"UNIQUE(s)"`
+	Type       unit.Type `xorm:"UNIQUE(s)"`
+	AccessMode perm.AccessMode
+}
+
+// Unit returns Unit
+func (t *TeamUnit) Unit() unit.Unit {
+	return unit.Units[t.Type]
+}
+
+func getUnitsByTeamID(ctx context.Context, teamID int64) (units []*TeamUnit, err error) {
+	return units, db.GetEngine(ctx).Where("team_id = ?", teamID).Find(&units)
+}
+
+// UpdateTeamUnits updates a teams's units
+func UpdateTeamUnits(ctx context.Context, team *Team, units []TeamUnit) (err error) {
+	ctx, committer, err := db.TxContext(ctx)
+	if err != nil {
+		return err
+	}
+	defer committer.Close()
+
+	if _, err = db.GetEngine(ctx).Where("team_id = ?", team.ID).Delete(new(TeamUnit)); err != nil {
+		return err
+	}
+
+	if len(units) > 0 {
+		if err = db.Insert(ctx, units); err != nil {
+			return err
+		}
+	}
+
+	return committer.Commit()
+}
diff --git a/models/organization/team_user.go b/models/organization/team_user.go
new file mode 100644
index 0000000..ab767db
--- /dev/null
+++ b/models/organization/team_user.go
@@ -0,0 +1,89 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package organization
+
+import (
+	"context"
+
+	"code.gitea.io/gitea/models/db"
+	user_model "code.gitea.io/gitea/models/user"
+
+	"xorm.io/builder"
+)
+
+// TeamUser represents an team-user relation.
+type TeamUser struct {
+	ID     int64 `xorm:"pk autoincr"`
+	OrgID  int64 `xorm:"INDEX"`
+	TeamID int64 `xorm:"UNIQUE(s)"`
+	UID    int64 `xorm:"UNIQUE(s)"`
+}
+
+// IsTeamMember returns true if given user is a member of team.
+func IsTeamMember(ctx context.Context, orgID, teamID, userID int64) (bool, error) {
+	return db.GetEngine(ctx).
+		Where("org_id=?", orgID).
+		And("team_id=?", teamID).
+		And("uid=?", userID).
+		Table("team_user").
+		Exist()
+}
+
+// GetTeamUsersByTeamID returns team users for a team
+func GetTeamUsersByTeamID(ctx context.Context, teamID int64) ([]*TeamUser, error) {
+	teamUsers := make([]*TeamUser, 0, 10)
+	return teamUsers, db.GetEngine(ctx).
+		Where("team_id=?", teamID).
+		Find(&teamUsers)
+}
+
+// SearchMembersOptions holds the search options
+type SearchMembersOptions struct {
+	db.ListOptions
+	TeamID int64
+}
+
+func (opts SearchMembersOptions) ToConds() builder.Cond {
+	cond := builder.NewCond()
+	if opts.TeamID > 0 {
+		cond = cond.And(builder.Eq{"": opts.TeamID})
+	}
+	return cond
+}
+
+// GetTeamMembers returns all members in given team of organization.
+func GetTeamMembers(ctx context.Context, opts *SearchMembersOptions) ([]*user_model.User, error) {
+	var members []*user_model.User
+	sess := db.GetEngine(ctx)
+	if opts.TeamID > 0 {
+		sess = sess.In("id",
+			builder.Select("uid").
+				From("team_user").
+				Where(builder.Eq{"team_id": opts.TeamID}),
+		)
+	}
+	if opts.PageSize > 0 && opts.Page > 0 {
+		sess = sess.Limit(opts.PageSize, (opts.Page-1)*opts.PageSize)
+	}
+	if err := sess.OrderBy("full_name, name").Find(&members); err != nil {
+		return nil, err
+	}
+	return members, nil
+}
+
+// IsUserInTeams returns if a user in some teams
+func IsUserInTeams(ctx context.Context, userID int64, teamIDs []int64) (bool, error) {
+	return db.GetEngine(ctx).Where("uid=?", userID).In("team_id", teamIDs).Exist(new(TeamUser))
+}
+
+// UsersInTeamsCount counts the number of users which are in userIDs and teamIDs
+func UsersInTeamsCount(ctx context.Context, userIDs, teamIDs []int64) (int64, error) {
+	var ids []int64
+	if err := db.GetEngine(ctx).In("uid", userIDs).In("team_id", teamIDs).
+		Table("team_user").
+		Cols("uid").GroupBy("uid").Find(&ids); err != nil {
+		return 0, err
+	}
+	return int64(len(ids)), nil
+}