Adding upstream version 9.0.0.

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

5 files changed, 904 insertions, 0 deletions

diff --git a/models/perm/access/access.go b/models/perm/access/access.go
new file mode 100644
index 0000000..3e2568b
--- /dev/null
+++ b/models/perm/access/access.go
@@ -0,0 +1,250 @@
+// Copyright 2014 The Gogs Authors. All rights reserved.
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package access
+
+import (
+	"context"
+	"fmt"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/organization"
+	"code.gitea.io/gitea/models/perm"
+	repo_model "code.gitea.io/gitea/models/repo"
+	user_model "code.gitea.io/gitea/models/user"
+
+	"xorm.io/builder"
+)
+
+// Access represents the highest access level of a user to the repository. The only access type
+// that is not in this table is the real owner of a repository. In case of an organization
+// repository, the members of the owners team are in this table.
+type Access struct {
+	ID     int64 `xorm:"pk autoincr"`
+	UserID int64 `xorm:"UNIQUE(s)"`
+	RepoID int64 `xorm:"UNIQUE(s)"`
+	Mode   perm.AccessMode
+}
+
+func init() {
+	db.RegisterModel(new(Access))
+}
+
+func accessLevel(ctx context.Context, user *user_model.User, repo *repo_model.Repository) (perm.AccessMode, error) {
+	mode := perm.AccessModeNone
+	var userID int64
+	restricted := false
+
+	if user != nil {
+		userID = user.ID
+		restricted = user.IsRestricted
+	}
+
+	if !restricted && !repo.IsPrivate {
+		mode = perm.AccessModeRead
+	}
+
+	if userID == 0 {
+		return mode, nil
+	}
+
+	if userID == repo.OwnerID {
+		return perm.AccessModeOwner, nil
+	}
+
+	a, exist, err := db.Get[Access](ctx, builder.Eq{"user_id": userID, "repo_id": repo.ID})
+	if err != nil {
+		return mode, err
+	} else if !exist {
+		return mode, nil
+	}
+	return a.Mode, nil
+}
+
+func maxAccessMode(modes ...perm.AccessMode) perm.AccessMode {
+	max := perm.AccessModeNone
+	for _, mode := range modes {
+		if mode > max {
+			max = mode
+		}
+	}
+	return max
+}
+
+type userAccess struct {
+	User *user_model.User
+	Mode perm.AccessMode
+}
+
+// updateUserAccess updates an access map so that user has at least mode
+func updateUserAccess(accessMap map[int64]*userAccess, user *user_model.User, mode perm.AccessMode) {
+	if ua, ok := accessMap[user.ID]; ok {
+		ua.Mode = maxAccessMode(ua.Mode, mode)
+	} else {
+		accessMap[user.ID] = &userAccess{User: user, Mode: mode}
+	}
+}
+
+// FIXME: do cross-comparison so reduce deletions and additions to the minimum?
+func refreshAccesses(ctx context.Context, repo *repo_model.Repository, accessMap map[int64]*userAccess) (err error) {
+	minMode := perm.AccessModeRead
+	if err := repo.LoadOwner(ctx); err != nil {
+		return fmt.Errorf("LoadOwner: %w", err)
+	}
+
+	// If the repo isn't private and isn't owned by a organization,
+	// increase the minMode to Write.
+	if !repo.IsPrivate && !repo.Owner.IsOrganization() {
+		minMode = perm.AccessModeWrite
+	}
+
+	newAccesses := make([]Access, 0, len(accessMap))
+	for userID, ua := range accessMap {
+		if ua.Mode < minMode && !ua.User.IsRestricted {
+			continue
+		}
+
+		newAccesses = append(newAccesses, Access{
+			UserID: userID,
+			RepoID: repo.ID,
+			Mode:   ua.Mode,
+		})
+	}
+
+	// Delete old accesses and insert new ones for repository.
+	if _, err = db.DeleteByBean(ctx, &Access{RepoID: repo.ID}); err != nil {
+		return fmt.Errorf("delete old accesses: %w", err)
+	}
+	if len(newAccesses) == 0 {
+		return nil
+	}
+
+	if err = db.Insert(ctx, newAccesses); err != nil {
+		return fmt.Errorf("insert new accesses: %w", err)
+	}
+	return nil
+}
+
+// refreshCollaboratorAccesses retrieves repository collaborations with their access modes.
+func refreshCollaboratorAccesses(ctx context.Context, repoID int64, accessMap map[int64]*userAccess) error {
+	collaborators, err := repo_model.GetCollaborators(ctx, repoID, db.ListOptions{})
+	if err != nil {
+		return fmt.Errorf("getCollaborations: %w", err)
+	}
+	for _, c := range collaborators {
+		if c.User.IsGhost() {
+			continue
+		}
+		updateUserAccess(accessMap, c.User, c.Collaboration.Mode)
+	}
+	return nil
+}
+
+// RecalculateTeamAccesses recalculates new accesses for teams of an organization
+// except the team whose ID is given. It is used to assign a team ID when
+// remove repository from that team.
+func RecalculateTeamAccesses(ctx context.Context, repo *repo_model.Repository, ignTeamID int64) (err error) {
+	accessMap := make(map[int64]*userAccess, 20)
+
+	if err = repo.LoadOwner(ctx); err != nil {
+		return err
+	} else if !repo.Owner.IsOrganization() {
+		return fmt.Errorf("owner is not an organization: %d", repo.OwnerID)
+	}
+
+	if err = refreshCollaboratorAccesses(ctx, repo.ID, accessMap); err != nil {
+		return fmt.Errorf("refreshCollaboratorAccesses: %w", err)
+	}
+
+	teams, err := organization.FindOrgTeams(ctx, repo.Owner.ID)
+	if err != nil {
+		return err
+	}
+
+	for _, t := range teams {
+		if t.ID == ignTeamID {
+			continue
+		}
+
+		// Owner team gets owner access, and skip for teams that do not
+		// have relations with repository.
+		if t.IsOwnerTeam() {
+			t.AccessMode = perm.AccessModeOwner
+		} else if !organization.HasTeamRepo(ctx, t.OrgID, t.ID, repo.ID) {
+			continue
+		}
+
+		if err = t.LoadMembers(ctx); err != nil {
+			return fmt.Errorf("getMembers '%d': %w", t.ID, err)
+		}
+		for _, m := range t.Members {
+			updateUserAccess(accessMap, m, t.AccessMode)
+		}
+	}
+
+	return refreshAccesses(ctx, repo, accessMap)
+}
+
+// RecalculateUserAccess recalculates new access for a single user
+// Usable if we know access only affected one user
+func RecalculateUserAccess(ctx context.Context, repo *repo_model.Repository, uid int64) (err error) {
+	minMode := perm.AccessModeRead
+	if !repo.IsPrivate {
+		minMode = perm.AccessModeWrite
+	}
+
+	accessMode := perm.AccessModeNone
+	e := db.GetEngine(ctx)
+	collaborator, err := repo_model.GetCollaboration(ctx, repo.ID, uid)
+	if err != nil {
+		return err
+	} else if collaborator != nil {
+		accessMode = collaborator.Mode
+	}
+
+	if err = repo.LoadOwner(ctx); err != nil {
+		return err
+	} else if repo.Owner.IsOrganization() {
+		var teams []organization.Team
+		if err := e.Join("INNER", "team_repo", "team_repo.team_id = team.id").
+			Join("INNER", "team_user", "team_user.team_id = team.id").
+			Where("team.org_id = ?", repo.OwnerID).
+			And("team_repo.repo_id=?", repo.ID).
+			And("team_user.uid=?", uid).
+			Find(&teams); err != nil {
+			return err
+		}
+
+		for _, t := range teams {
+			if t.IsOwnerTeam() {
+				t.AccessMode = perm.AccessModeOwner
+			}
+
+			accessMode = maxAccessMode(accessMode, t.AccessMode)
+		}
+	}
+
+	// Delete old user accesses and insert new one for repository.
+	if _, err = e.Delete(&Access{RepoID: repo.ID, UserID: uid}); err != nil {
+		return fmt.Errorf("delete old user accesses: %w", err)
+	} else if accessMode >= minMode {
+		if err = db.Insert(ctx, &Access{RepoID: repo.ID, UserID: uid, Mode: accessMode}); err != nil {
+			return fmt.Errorf("insert new user accesses: %w", err)
+		}
+	}
+	return nil
+}
+
+// RecalculateAccesses recalculates all accesses for repository.
+func RecalculateAccesses(ctx context.Context, repo *repo_model.Repository) error {
+	if repo.Owner.IsOrganization() {
+		return RecalculateTeamAccesses(ctx, repo, 0)
+	}
+
+	accessMap := make(map[int64]*userAccess, 20)
+	if err := refreshCollaboratorAccesses(ctx, repo.ID, accessMap); err != nil {
+		return fmt.Errorf("refreshCollaboratorAccesses: %w", err)
+	}
+	return refreshAccesses(ctx, repo, accessMap)
+}
diff --git a/models/perm/access/access_test.go b/models/perm/access/access_test.go
new file mode 100644
index 0000000..556f513
--- /dev/null
+++ b/models/perm/access/access_test.go
@@ -0,0 +1,127 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package access_test
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models/db"
+	perm_model "code.gitea.io/gitea/models/perm"
+	access_model "code.gitea.io/gitea/models/perm/access"
+	repo_model "code.gitea.io/gitea/models/repo"
+	"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 TestAccessLevel(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	user2 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+	user5 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 5})
+	user29 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 29})
+	// A public repository owned by User 2
+	repo1 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1})
+	assert.False(t, repo1.IsPrivate)
+	// A private repository owned by Org 3
+	repo3 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 3})
+	assert.True(t, repo3.IsPrivate)
+
+	// Another public repository
+	repo4 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 4})
+	assert.False(t, repo4.IsPrivate)
+	// org. owned private repo
+	repo24 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 24})
+
+	level, err := access_model.AccessLevel(db.DefaultContext, user2, repo1)
+	require.NoError(t, err)
+	assert.Equal(t, perm_model.AccessModeOwner, level)
+
+	level, err = access_model.AccessLevel(db.DefaultContext, user2, repo3)
+	require.NoError(t, err)
+	assert.Equal(t, perm_model.AccessModeOwner, level)
+
+	level, err = access_model.AccessLevel(db.DefaultContext, user5, repo1)
+	require.NoError(t, err)
+	assert.Equal(t, perm_model.AccessModeRead, level)
+
+	level, err = access_model.AccessLevel(db.DefaultContext, user5, repo3)
+	require.NoError(t, err)
+	assert.Equal(t, perm_model.AccessModeNone, level)
+
+	// restricted user has no access to a public repo
+	level, err = access_model.AccessLevel(db.DefaultContext, user29, repo1)
+	require.NoError(t, err)
+	assert.Equal(t, perm_model.AccessModeNone, level)
+
+	// ... unless he's a collaborator
+	level, err = access_model.AccessLevel(db.DefaultContext, user29, repo4)
+	require.NoError(t, err)
+	assert.Equal(t, perm_model.AccessModeWrite, level)
+
+	// ... or a team member
+	level, err = access_model.AccessLevel(db.DefaultContext, user29, repo24)
+	require.NoError(t, err)
+	assert.Equal(t, perm_model.AccessModeRead, level)
+}
+
+func TestHasAccess(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	user1 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+	user2 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 5})
+	// A public repository owned by User 2
+	repo1 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1})
+	assert.False(t, repo1.IsPrivate)
+	// A private repository owned by Org 3
+	repo2 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 3})
+	assert.True(t, repo2.IsPrivate)
+
+	has, err := access_model.HasAccess(db.DefaultContext, user1.ID, repo1)
+	require.NoError(t, err)
+	assert.True(t, has)
+
+	_, err = access_model.HasAccess(db.DefaultContext, user1.ID, repo2)
+	require.NoError(t, err)
+
+	_, err = access_model.HasAccess(db.DefaultContext, user2.ID, repo1)
+	require.NoError(t, err)
+
+	_, err = access_model.HasAccess(db.DefaultContext, user2.ID, repo2)
+	require.NoError(t, err)
+}
+
+func TestRepository_RecalculateAccesses(t *testing.T) {
+	// test with organization repo
+	require.NoError(t, unittest.PrepareTestDatabase())
+	repo1 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 3})
+	require.NoError(t, repo1.LoadOwner(db.DefaultContext))
+
+	_, err := db.GetEngine(db.DefaultContext).Delete(&repo_model.Collaboration{UserID: 2, RepoID: 3})
+	require.NoError(t, err)
+	require.NoError(t, access_model.RecalculateAccesses(db.DefaultContext, repo1))
+
+	access := &access_model.Access{UserID: 2, RepoID: 3}
+	has, err := db.GetEngine(db.DefaultContext).Get(access)
+	require.NoError(t, err)
+	assert.True(t, has)
+	assert.Equal(t, perm_model.AccessModeOwner, access.Mode)
+}
+
+func TestRepository_RecalculateAccesses2(t *testing.T) {
+	// test with non-organization repo
+	require.NoError(t, unittest.PrepareTestDatabase())
+	repo1 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 4})
+	require.NoError(t, repo1.LoadOwner(db.DefaultContext))
+
+	_, err := db.GetEngine(db.DefaultContext).Delete(&repo_model.Collaboration{UserID: 4, RepoID: 4})
+	require.NoError(t, err)
+	require.NoError(t, access_model.RecalculateAccesses(db.DefaultContext, repo1))
+
+	has, err := db.GetEngine(db.DefaultContext).Get(&access_model.Access{UserID: 4, RepoID: 4})
+	require.NoError(t, err)
+	assert.False(t, has)
+}
diff --git a/models/perm/access/main_test.go b/models/perm/access/main_test.go
new file mode 100644
index 0000000..0a350dc
--- /dev/null
+++ b/models/perm/access/main_test.go
@@ -0,0 +1,20 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package access_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/repo"
+	_ "code.gitea.io/gitea/models/user"
+)
+
+func TestMain(m *testing.M) {
+	unittest.MainTest(m)
+}
diff --git a/models/perm/access/repo_permission.go b/models/perm/access/repo_permission.go
new file mode 100644
index 0000000..7e39627
--- /dev/null
+++ b/models/perm/access/repo_permission.go
@@ -0,0 +1,450 @@
+// Copyright 2018 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package access
+
+import (
+	"context"
+	"fmt"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/organization"
+	perm_model "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"
+)
+
+// Permission contains all the permissions related variables to a repository for a user
+type Permission struct {
+	AccessMode perm_model.AccessMode
+	Units      []*repo_model.RepoUnit
+	UnitsMode  map[unit.Type]perm_model.AccessMode
+}
+
+// IsOwner returns true if current user is the owner of repository.
+func (p *Permission) IsOwner() bool {
+	return p.AccessMode >= perm_model.AccessModeOwner
+}
+
+// IsAdmin returns true if current user has admin or higher access of repository.
+func (p *Permission) IsAdmin() bool {
+	return p.AccessMode >= perm_model.AccessModeAdmin
+}
+
+// IsGloballyWriteable returns true if the unit is writeable by all users of the instance.
+func (p *Permission) IsGloballyWriteable(unitType unit.Type) bool {
+	for _, u := range p.Units {
+		if u.Type == unitType {
+			return u.DefaultPermissions == repo_model.UnitAccessModeWrite
+		}
+	}
+	return false
+}
+
+// HasAccess returns true if the current user has at least read access to any unit of this repository
+func (p *Permission) HasAccess() bool {
+	if p.UnitsMode == nil {
+		return p.AccessMode >= perm_model.AccessModeRead
+	}
+	return len(p.UnitsMode) > 0
+}
+
+// UnitAccessMode returns current user accessmode to the specify unit of the repository
+func (p *Permission) UnitAccessMode(unitType unit.Type) perm_model.AccessMode {
+	if p.UnitsMode == nil {
+		for _, u := range p.Units {
+			if u.Type == unitType {
+				return p.AccessMode
+			}
+		}
+		return perm_model.AccessModeNone
+	}
+	return p.UnitsMode[unitType]
+}
+
+// CanAccess returns true if user has mode access to the unit of the repository
+func (p *Permission) CanAccess(mode perm_model.AccessMode, unitType unit.Type) bool {
+	return p.UnitAccessMode(unitType) >= mode
+}
+
+// CanAccessAny returns true if user has mode access to any of the units of the repository
+func (p *Permission) CanAccessAny(mode perm_model.AccessMode, unitTypes ...unit.Type) bool {
+	for _, u := range unitTypes {
+		if p.CanAccess(mode, u) {
+			return true
+		}
+	}
+	return false
+}
+
+// CanRead returns true if user could read to this unit
+func (p *Permission) CanRead(unitType unit.Type) bool {
+	return p.CanAccess(perm_model.AccessModeRead, unitType)
+}
+
+// CanReadAny returns true if user has read access to any of the units of the repository
+func (p *Permission) CanReadAny(unitTypes ...unit.Type) bool {
+	return p.CanAccessAny(perm_model.AccessModeRead, unitTypes...)
+}
+
+// CanReadIssuesOrPulls returns true if isPull is true and user could read pull requests and
+// returns true if isPull is false and user could read to issues
+func (p *Permission) CanReadIssuesOrPulls(isPull bool) bool {
+	if isPull {
+		return p.CanRead(unit.TypePullRequests)
+	}
+	return p.CanRead(unit.TypeIssues)
+}
+
+// CanWrite returns true if user could write to this unit
+func (p *Permission) CanWrite(unitType unit.Type) bool {
+	return p.CanAccess(perm_model.AccessModeWrite, unitType)
+}
+
+// CanWriteIssuesOrPulls returns true if isPull is true and user could write to pull requests and
+// returns true if isPull is false and user could write to issues
+func (p *Permission) CanWriteIssuesOrPulls(isPull bool) bool {
+	if isPull {
+		return p.CanWrite(unit.TypePullRequests)
+	}
+	return p.CanWrite(unit.TypeIssues)
+}
+
+func (p *Permission) LogString() string {
+	format := "<Permission AccessMode=%s, %d Units, %d UnitsMode(s): [ "
+	args := []any{p.AccessMode.String(), len(p.Units), len(p.UnitsMode)}
+
+	for i, unit := range p.Units {
+		config := ""
+		if unit.Config != nil {
+			configBytes, err := unit.Config.ToDB()
+			config = string(configBytes)
+			if err != nil {
+				config = err.Error()
+			}
+		}
+		format += "\nUnits[%d]: ID: %d RepoID: %d Type: %s Config: %s"
+		args = append(args, i, unit.ID, unit.RepoID, unit.Type.LogString(), config)
+	}
+	for key, value := range p.UnitsMode {
+		format += "\nUnitMode[%-v]: %-v"
+		args = append(args, key.LogString(), value.LogString())
+	}
+	format += " ]>"
+	return fmt.Sprintf(format, args...)
+}
+
+// GetUserRepoPermission returns the user permissions to the repository
+func GetUserRepoPermission(ctx context.Context, repo *repo_model.Repository, user *user_model.User) (Permission, error) {
+	var perm Permission
+	if log.IsTrace() {
+		defer func() {
+			if user == nil {
+				log.Trace("Permission Loaded for anonymous user in %-v:\nPermissions: %-+v",
+					repo,
+					perm)
+				return
+			}
+			log.Trace("Permission Loaded for %-v in %-v:\nPermissions: %-+v",
+				user,
+				repo,
+				perm)
+		}()
+	}
+
+	// anonymous user visit private repo.
+	// TODO: anonymous user visit public unit of private repo???
+	if user == nil && repo.IsPrivate {
+		perm.AccessMode = perm_model.AccessModeNone
+		return perm, nil
+	}
+
+	var isCollaborator bool
+	var err error
+	if user != nil {
+		isCollaborator, err = repo_model.IsCollaborator(ctx, repo.ID, user.ID)
+		if err != nil {
+			return perm, err
+		}
+	}
+
+	if err := repo.LoadOwner(ctx); err != nil {
+		return perm, err
+	}
+
+	// Prevent strangers from checking out public repo of private organization/users
+	// Allow user if they are collaborator of a repo within a private user or a private organization but not a member of the organization itself
+	if !organization.HasOrgOrUserVisible(ctx, repo.Owner, user) && !isCollaborator {
+		perm.AccessMode = perm_model.AccessModeNone
+		return perm, nil
+	}
+
+	if err := repo.LoadUnits(ctx); err != nil {
+		return perm, err
+	}
+
+	perm.Units = repo.Units
+
+	// anonymous visit public repo
+	if user == nil {
+		perm.AccessMode = perm_model.AccessModeRead
+		return perm, nil
+	}
+
+	// Admin or the owner has super access to the repository
+	if user.IsAdmin || user.ID == repo.OwnerID {
+		perm.AccessMode = perm_model.AccessModeOwner
+		return perm, nil
+	}
+
+	// plain user
+	perm.AccessMode, err = accessLevel(ctx, user, repo)
+	if err != nil {
+		return perm, err
+	}
+
+	if err := repo.LoadOwner(ctx); err != nil {
+		return perm, err
+	}
+
+	if !repo.Owner.IsOrganization() {
+		// for a public repo, different repo units may have different default
+		// permissions for non-restricted users.
+		if !repo.IsPrivate && !user.IsRestricted && len(repo.Units) > 0 {
+			perm.UnitsMode = make(map[unit.Type]perm_model.AccessMode)
+			for _, u := range repo.Units {
+				if _, ok := perm.UnitsMode[u.Type]; !ok {
+					perm.UnitsMode[u.Type] = u.DefaultPermissions.ToAccessMode(perm.AccessMode)
+				}
+			}
+		}
+
+		return perm, nil
+	}
+
+	perm.UnitsMode = make(map[unit.Type]perm_model.AccessMode)
+
+	// Collaborators on organization
+	if isCollaborator {
+		for _, u := range repo.Units {
+			perm.UnitsMode[u.Type] = perm.AccessMode
+		}
+	}
+
+	// get units mode from teams
+	teams, err := organization.GetUserRepoTeams(ctx, repo.OwnerID, user.ID, repo.ID)
+	if err != nil {
+		return perm, err
+	}
+
+	// if user in an owner team
+	for _, team := range teams {
+		if team.AccessMode >= perm_model.AccessModeAdmin {
+			perm.AccessMode = perm_model.AccessModeOwner
+			perm.UnitsMode = nil
+			return perm, nil
+		}
+	}
+
+	for _, u := range repo.Units {
+		var found bool
+		for _, team := range teams {
+			teamMode := team.UnitAccessMode(ctx, u.Type)
+			if teamMode > perm_model.AccessModeNone {
+				m := perm.UnitsMode[u.Type]
+				if m < teamMode {
+					perm.UnitsMode[u.Type] = teamMode
+				}
+				found = true
+			}
+		}
+
+		// for a public repo on an organization, a non-restricted user should
+		// have the same permission on non-team defined units as the default
+		// permissions for the repo unit.
+		if !found && !repo.IsPrivate && !user.IsRestricted {
+			if _, ok := perm.UnitsMode[u.Type]; !ok {
+				perm.UnitsMode[u.Type] = u.DefaultPermissions.ToAccessMode(perm_model.AccessModeRead)
+			}
+		}
+	}
+
+	// remove no permission units
+	perm.Units = make([]*repo_model.RepoUnit, 0, len(repo.Units))
+	for t := range perm.UnitsMode {
+		for _, u := range repo.Units {
+			if u.Type == t {
+				perm.Units = append(perm.Units, u)
+			}
+		}
+	}
+
+	return perm, err
+}
+
+// IsUserRealRepoAdmin check if this user is real repo admin
+func IsUserRealRepoAdmin(ctx context.Context, repo *repo_model.Repository, user *user_model.User) (bool, error) {
+	if repo.OwnerID == user.ID {
+		return true, nil
+	}
+
+	if err := repo.LoadOwner(ctx); err != nil {
+		return false, err
+	}
+
+	accessMode, err := accessLevel(ctx, user, repo)
+	if err != nil {
+		return false, err
+	}
+
+	return accessMode >= perm_model.AccessModeAdmin, nil
+}
+
+// IsUserRepoAdmin return true if user has admin right of a repo
+func IsUserRepoAdmin(ctx context.Context, repo *repo_model.Repository, user *user_model.User) (bool, error) {
+	if user == nil || repo == nil {
+		return false, nil
+	}
+	if user.IsAdmin {
+		return true, nil
+	}
+
+	mode, err := accessLevel(ctx, user, repo)
+	if err != nil {
+		return false, err
+	}
+	if mode >= perm_model.AccessModeAdmin {
+		return true, nil
+	}
+
+	teams, err := organization.GetUserRepoTeams(ctx, repo.OwnerID, user.ID, repo.ID)
+	if err != nil {
+		return false, err
+	}
+
+	for _, team := range teams {
+		if team.AccessMode >= perm_model.AccessModeAdmin {
+			return true, nil
+		}
+	}
+	return false, nil
+}
+
+// AccessLevel returns the Access a user has to a repository. Will return NoneAccess if the
+// user does not have access.
+func AccessLevel(ctx context.Context, user *user_model.User, repo *repo_model.Repository) (perm_model.AccessMode, error) { //nolint
+	return AccessLevelUnit(ctx, user, repo, unit.TypeCode)
+}
+
+// AccessLevelUnit returns the Access a user has to a repository's. Will return NoneAccess if the
+// user does not have access.
+func AccessLevelUnit(ctx context.Context, user *user_model.User, repo *repo_model.Repository, unitType unit.Type) (perm_model.AccessMode, error) { //nolint
+	perm, err := GetUserRepoPermission(ctx, repo, user)
+	if err != nil {
+		return perm_model.AccessModeNone, err
+	}
+	return perm.UnitAccessMode(unitType), nil
+}
+
+// HasAccessUnit returns true if user has testMode to the unit of the repository
+func HasAccessUnit(ctx context.Context, user *user_model.User, repo *repo_model.Repository, unitType unit.Type, testMode perm_model.AccessMode) (bool, error) {
+	mode, err := AccessLevelUnit(ctx, user, repo, unitType)
+	return testMode <= mode, err
+}
+
+// CanBeAssigned return true if user can be assigned to issue or pull requests in repo
+// Currently any write access (code, issues or pr's) is assignable, to match assignee list in user interface.
+func CanBeAssigned(ctx context.Context, user *user_model.User, repo *repo_model.Repository, _ bool) (bool, error) {
+	if user.IsOrganization() {
+		return false, fmt.Errorf("Organization can't be added as assignee [user_id: %d, repo_id: %d]", user.ID, repo.ID)
+	}
+	perm, err := GetUserRepoPermission(ctx, repo, user)
+	if err != nil {
+		return false, err
+	}
+	return perm.CanAccessAny(perm_model.AccessModeWrite, unit.AllRepoUnitTypes...) ||
+		perm.CanAccessAny(perm_model.AccessModeRead, unit.TypePullRequests), nil
+}
+
+// HasAccess returns true if user has access to repo
+func HasAccess(ctx context.Context, userID int64, repo *repo_model.Repository) (bool, error) {
+	var user *user_model.User
+	var err error
+	if userID > 0 {
+		user, err = user_model.GetUserByID(ctx, userID)
+		if err != nil {
+			return false, err
+		}
+	}
+	perm, err := GetUserRepoPermission(ctx, repo, user)
+	if err != nil {
+		return false, err
+	}
+	return perm.HasAccess(), nil
+}
+
+// getUsersWithAccessMode returns users that have at least given access mode to the repository.
+func getUsersWithAccessMode(ctx context.Context, repo *repo_model.Repository, mode perm_model.AccessMode) (_ []*user_model.User, err error) {
+	if err = repo.LoadOwner(ctx); err != nil {
+		return nil, err
+	}
+
+	e := db.GetEngine(ctx)
+	accesses := make([]*Access, 0, 10)
+	if err = e.Where("repo_id = ? AND mode >= ?", repo.ID, mode).Find(&accesses); err != nil {
+		return nil, err
+	}
+
+	// Leave a seat for owner itself to append later, but if owner is an organization
+	// and just waste 1 unit is cheaper than re-allocate memory once.
+	users := make([]*user_model.User, 0, len(accesses)+1)
+	if len(accesses) > 0 {
+		userIDs := make([]int64, len(accesses))
+		for i := 0; i < len(accesses); i++ {
+			userIDs[i] = accesses[i].UserID
+		}
+
+		if err = e.In("id", userIDs).Find(&users); err != nil {
+			return nil, err
+		}
+	}
+	if !repo.Owner.IsOrganization() {
+		users = append(users, repo.Owner)
+	}
+
+	return users, nil
+}
+
+// GetRepoReaders returns all users that have explicit read access or higher to the repository.
+func GetRepoReaders(ctx context.Context, repo *repo_model.Repository) (_ []*user_model.User, err error) {
+	return getUsersWithAccessMode(ctx, repo, perm_model.AccessModeRead)
+}
+
+// GetRepoWriters returns all users that have write access to the repository.
+func GetRepoWriters(ctx context.Context, repo *repo_model.Repository) (_ []*user_model.User, err error) {
+	return getUsersWithAccessMode(ctx, repo, perm_model.AccessModeWrite)
+}
+
+// IsRepoReader returns true if user has explicit read access or higher to the repository.
+func IsRepoReader(ctx context.Context, repo *repo_model.Repository, userID int64) (bool, error) {
+	if repo.OwnerID == userID {
+		return true, nil
+	}
+	return db.GetEngine(ctx).Where("repo_id = ? AND user_id = ? AND mode >= ?", repo.ID, userID, perm_model.AccessModeRead).Get(&Access{})
+}
+
+// CheckRepoUnitUser check whether user could visit the unit of this repository
+func CheckRepoUnitUser(ctx context.Context, repo *repo_model.Repository, user *user_model.User, unitType unit.Type) bool {
+	if user != nil && user.IsAdmin {
+		return true
+	}
+	perm, err := GetUserRepoPermission(ctx, repo, user)
+	if err != nil {
+		log.Error("GetUserRepoPermission: %w", err)
+		return false
+	}
+
+	return perm.CanRead(unitType)
+}
diff --git a/models/perm/access_mode.go b/models/perm/access_mode.go
new file mode 100644
index 0000000..a37bc1f
--- /dev/null
+++ b/models/perm/access_mode.go
@@ -0,0 +1,57 @@
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package perm
+
+import (
+	"fmt"
+)
+
+// AccessMode specifies the users access mode
+type AccessMode int
+
+const (
+	// AccessModeNone no access
+	AccessModeNone AccessMode = iota // 0
+	// AccessModeRead read access
+	AccessModeRead // 1
+	// AccessModeWrite write access
+	AccessModeWrite // 2
+	// AccessModeAdmin admin access
+	AccessModeAdmin // 3
+	// AccessModeOwner owner access
+	AccessModeOwner // 4
+)
+
+func (mode AccessMode) String() string {
+	switch mode {
+	case AccessModeRead:
+		return "read"
+	case AccessModeWrite:
+		return "write"
+	case AccessModeAdmin:
+		return "admin"
+	case AccessModeOwner:
+		return "owner"
+	default:
+		return "none"
+	}
+}
+
+func (mode AccessMode) LogString() string {
+	return fmt.Sprintf("<AccessMode:%d:%s>", mode, mode.String())
+}
+
+// ParseAccessMode returns corresponding access mode to given permission string.
+func ParseAccessMode(permission string) AccessMode {
+	switch permission {
+	case "read":
+		return AccessModeRead
+	case "write":
+		return AccessModeWrite
+	case "admin":
+		return AccessModeAdmin
+	default:
+		return AccessModeNone
+	}
+}