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useraccess.go
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useraccess.go
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// Copyright 2016 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package state
import (
"fmt"
"strings"
"time"
"github.com/juju/errors"
"github.com/juju/names/v4"
"gopkg.in/mgo.v2/txn"
"github.com/juju/juju/core/permission"
)
type userAccessDoc struct {
ID string `bson:"_id"`
ObjectUUID string `bson:"object-uuid"`
UserName string `bson:"user"`
DisplayName string `bson:"displayname"`
CreatedBy string `bson:"createdby"`
DateCreated time.Time `bson:"datecreated"`
}
// UserAccessSpec defines the attributes that can be set when adding a new
// user access.
type UserAccessSpec struct {
User names.UserTag
CreatedBy names.UserTag
DisplayName string
Access permission.Access
}
// userAccessTarget defines the target of a user access granting.
type userAccessTarget struct {
uuid string
globalKey string
}
// AddUser adds a new user for the model to the database.
func (m *Model) AddUser(spec UserAccessSpec) (permission.UserAccess, error) {
if err := permission.ValidateModelAccess(spec.Access); err != nil {
return permission.UserAccess{}, errors.Annotate(err, "adding model user")
}
target := userAccessTarget{
uuid: m.UUID(),
globalKey: modelGlobalKey,
}
return m.st.addUserAccess(spec, target)
}
// AddControllerUser adds a new user for the current controller to the database.
func (st *State) AddControllerUser(spec UserAccessSpec) (permission.UserAccess, error) {
if err := permission.ValidateControllerAccess(spec.Access); err != nil {
return permission.UserAccess{}, errors.Annotate(err, "adding controller user")
}
return st.addUserAccess(spec, userAccessTarget{globalKey: controllerGlobalKey})
}
func (st *State) addUserAccess(spec UserAccessSpec, target userAccessTarget) (permission.UserAccess, error) {
// Ensure local user exists in state before adding them as an model user.
if spec.User.IsLocal() {
localUser, err := st.User(spec.User)
if err != nil {
return permission.UserAccess{}, errors.Annotate(err, fmt.Sprintf("user %q does not exist locally", spec.User.Name()))
}
if spec.DisplayName == "" {
spec.DisplayName = localUser.DisplayName()
}
}
// Ensure local createdBy user exists.
if spec.CreatedBy.IsLocal() {
if _, err := st.User(spec.CreatedBy); err != nil {
return permission.UserAccess{}, errors.Annotatef(err, "createdBy user %q does not exist locally", spec.CreatedBy.Name())
}
}
var (
ops []txn.Op
err error
targetTag names.Tag
)
switch target.globalKey {
case modelGlobalKey:
ops = createModelUserOps(
target.uuid,
spec.User,
spec.CreatedBy,
spec.DisplayName,
st.nowToTheSecond(),
spec.Access)
targetTag = names.NewModelTag(target.uuid)
case controllerGlobalKey:
ops = createControllerUserOps(
st.ControllerUUID(),
spec.User,
spec.CreatedBy,
spec.DisplayName,
st.nowToTheSecond(),
spec.Access)
targetTag = st.controllerTag
default:
return permission.UserAccess{}, errors.NotSupportedf("user access global key %q", target.globalKey)
}
err = st.db().RunTransactionFor(target.uuid, ops)
if err == txn.ErrAborted {
err = errors.AlreadyExistsf("user access %q", spec.User.Id())
}
if err != nil {
return permission.UserAccess{}, errors.Trace(err)
}
return st.UserAccess(spec.User, targetTag)
}
// userAccessID returns the document id of the user access.
func userAccessID(user names.UserTag) string {
username := user.Id()
return strings.ToLower(username)
}
// NewModelUserAccess returns a new permission.UserAccess for the given userDoc and
// current Model.
func NewModelUserAccess(st *State, userDoc userAccessDoc) (permission.UserAccess, error) {
perm, err := st.userPermission(modelKey(userDoc.ObjectUUID), userGlobalKey(strings.ToLower(userDoc.UserName)))
if err != nil {
return permission.UserAccess{}, errors.Annotate(err, "obtaining model permission")
}
return newUserAccess(perm, userDoc, names.NewModelTag(userDoc.ObjectUUID)), nil
}
// NewControllerUserAccess returns a new permission.UserAccess for the given userDoc and
// current Controller.
func NewControllerUserAccess(st *State, userDoc userAccessDoc) (permission.UserAccess, error) {
perm, err := st.userPermission(controllerKey(st.ControllerUUID()), userGlobalKey(strings.ToLower(userDoc.UserName)))
if err != nil {
return permission.UserAccess{}, errors.Annotate(err, "obtaining controller permission")
}
return newUserAccess(perm, userDoc, names.NewControllerTag(userDoc.ObjectUUID)), nil
}
// UserPermission returns the access permission for the passed subject and target.
func (st *State) UserPermission(subject names.UserTag, target names.Tag) (permission.Access, error) {
if err := st.userMayHaveAccess(subject); err != nil {
return "", errors.Trace(err)
}
switch target.Kind() {
case names.ModelTagKind, names.ControllerTagKind:
access, err := st.UserAccess(subject, target)
if err != nil {
return "", errors.Trace(err)
}
return access.Access, nil
case names.ApplicationOfferTagKind:
offerUUID, err := applicationOfferUUID(st, target.Id())
if err != nil {
return "", errors.Trace(err)
}
return st.GetOfferAccess(offerUUID, subject)
case names.CloudTagKind:
return st.GetCloudAccess(target.Id(), subject)
default:
return "", errors.NotValidf("%q as a target", target.Kind())
}
}
func newUserAccess(perm *userPermission, userDoc userAccessDoc, object names.Tag) permission.UserAccess {
return permission.UserAccess{
UserID: userDoc.ID,
UserTag: names.NewUserTag(userDoc.UserName),
Object: object,
Access: perm.access(),
CreatedBy: names.NewUserTag(userDoc.CreatedBy),
DateCreated: userDoc.DateCreated.UTC(),
DisplayName: userDoc.DisplayName,
UserName: userDoc.UserName,
}
}
func (st *State) userMayHaveAccess(tag names.UserTag) error {
if !tag.IsLocal() {
// external users may have access
return nil
}
localUser, err := st.User(tag)
if err != nil {
return errors.Trace(err)
}
// Since deleted users will throw an error above, we need to check whether the user has been disabled here.
if localUser.IsDisabled() {
return errors.Errorf("user %q is disabled", tag.Id())
}
return nil
}
// UserAccess returns a new permission.UserAccess for the passed subject and target.
func (st *State) UserAccess(subject names.UserTag, target names.Tag) (permission.UserAccess, error) {
if err := st.userMayHaveAccess(subject); err != nil {
return permission.UserAccess{}, errors.Trace(err)
}
var (
userDoc userAccessDoc
err error
)
switch target.Kind() {
case names.ModelTagKind:
userDoc, err = st.modelUser(target.Id(), subject)
if err == nil {
return NewModelUserAccess(st, userDoc)
}
case names.ControllerTagKind:
userDoc, err = st.controllerUser(subject)
if err == nil {
return NewControllerUserAccess(st, userDoc)
}
default:
return permission.UserAccess{}, errors.NotValidf("%q as a target", target.Kind())
}
return permission.UserAccess{}, errors.Trace(err)
}
// SetUserAccess sets <access> level on <target> to <subject>.
func (st *State) SetUserAccess(subject names.UserTag, target names.Tag, access permission.Access) (permission.UserAccess, error) {
err := access.Validate()
if err != nil {
return permission.UserAccess{}, errors.Trace(err)
}
switch target.Kind() {
case names.ModelTagKind:
err = st.setModelAccess(access, userGlobalKey(userAccessID(subject)), target.Id())
case names.ControllerTagKind:
err = st.setControllerAccess(access, userGlobalKey(userAccessID(subject)))
default:
return permission.UserAccess{}, errors.NotValidf("%q as a target", target.Kind())
}
if err != nil {
return permission.UserAccess{}, errors.Trace(err)
}
return st.UserAccess(subject, target)
}
// RemoveUserAccess removes access for subject to the passed tag.
func (st *State) RemoveUserAccess(subject names.UserTag, target names.Tag) error {
switch target.Kind() {
case names.ModelTagKind:
return errors.Trace(st.removeModelUser(subject))
case names.ControllerTagKind:
return errors.Trace(st.removeControllerUser(subject))
}
return errors.NotValidf("%q as a target", target.Kind())
}