func (self *Permissions) AuthorizeDeleteClusterAdmin(user common.User) (ok bool, err common.AuthorizationError) {
	if !user.IsClusterAdmin() {
		return false, common.NewAuthorizationError("Insufficient permissions to delete cluster admin")
	}

	return true, ""
}

func (self *CoordinatorImpl) ChangeDbUserPermissions(requester common.User, db, username, readPermissions, writePermissions string) error {
	if !requester.IsClusterAdmin() && !requester.IsDbAdmin(db) {
		return common.NewAuthorizationError("Insufficient permissions")
	}

	return self.raftServer.ChangeDbUserPermissions(db, username, readPermissions, writePermissions)
}

func (self *Permissions) AuthorizeDeleteQuery(user common.User, db string) (ok bool, err common.AuthorizationError) {
	if !user.IsDbAdmin(db) {
		return false, common.NewAuthorizationError("Insufficient permission to write to %s", db)
	}

	return true, ""
}

func (self *CoordinatorImpl) ListClusterAdmins(requester common.User) ([]string, error) {
	if !requester.IsClusterAdmin() {
		return nil, common.NewAuthorizationError("Insufficient permissions")
	}

	return self.clusterConfiguration.GetClusterAdmins(), nil
}

func (self *CoordinatorImpl) WriteSeriesData(user common.User, db string, series []*protocol.Series) error {
	// make sure that the db exist
	if !self.clusterConfiguration.DatabasesExists(db) {
		return fmt.Errorf("Database %s doesn't exist", db)
	}

	for _, s := range series {
		seriesName := s.GetName()
		if user.HasWriteAccess(seriesName) {
			continue
		}
		return common.NewAuthorizationError("User %s doesn't have write permissions for %s", user.GetName(), seriesName)
	}

	err := self.CommitSeriesData(db, series, false)
	if err != nil {
		return err
	}

	for _, s := range series {
		self.ProcessContinuousQueries(db, s)
	}

	return err
}

func (self *CoordinatorImpl) DropDatabase(user common.User, db string) error {
	if !user.IsClusterAdmin() {
		return common.NewAuthorizationError("Insufficient permission to drop database")
	}

	if self.clusterConfiguration.IsSingleServer() {
		if err := self.datastore.DropDatabase(db); err != nil {
			return err
		}
	} else {
		servers, _ := self.clusterConfiguration.GetServersToMakeQueryTo(&db)
		for _, server := range servers {
			if err := self.handleDropDatabase(server.server, db); err != nil {
				return err
			}
		}
	}

	// don't delete the metadata, we need the replication factor to be
	// able to replicate the request properly
	if err := self.raftServer.DropDatabase(db); err != nil {
		return err
	}

	return nil
}

func (self *CoordinatorImpl) ForceCompaction(user common.User) error {
	if !user.IsClusterAdmin() {
		return fmt.Errorf("Insufficient permissions to force a log compaction")
	}

	return self.raftServer.ForceLogCompaction()
}

func (self *LevelDbDatastore) ExecuteQuery(user common.User, database string,
	query *parser.SelectQuery, yield func(*protocol.Series) error,
	ringFilter func(database, series *string, time *int64) bool) error {

	seriesAndColumns := query.GetReferencedColumns()
	hasAccess := true
	for series, columns := range seriesAndColumns {
		if regex, ok := series.GetCompiledRegex(); ok {
			seriesNames := self.getSeriesForDbAndRegex(database, regex)
			for _, name := range seriesNames {
				if !user.HasReadAccess(name) {
					hasAccess = false
					continue
				}
				err := self.executeQueryForSeries(database, name, columns, query, yield, ringFilter)
				if err != nil {
					return err
				}
			}
		} else {
			if !user.HasReadAccess(series.Name) {
				hasAccess = false
				continue
			}
			err := self.executeQueryForSeries(database, series.Name, columns, query, yield, ringFilter)
			if err != nil {
				return err
			}
		}
	}
	if !hasAccess {
		return fmt.Errorf("You don't have permission to access one or more time series")
	}
	return nil
}

func (self *Permissions) AuthorizeDropDatabase(user common.User) (ok bool, err common.AuthorizationError) {
	if !user.IsClusterAdmin() {
		return false, common.NewAuthorizationError("Insufficient permissions to drop database")
	}

	return true, ""
}

func (self *CoordinatorImpl) ListDbUsers(requester common.User, db string) ([]common.User, error) {
	if !requester.IsClusterAdmin() && !requester.IsDbAdmin(db) {
		return nil, common.NewAuthorizationError("Insufficient permissions")
	}

	return self.clusterConfiguration.GetDbUsers(db), nil
}

func (self *Permissions) AuthorizeDropSeries(user common.User, db string, seriesName string) (ok bool, err common.AuthorizationError) {
	if !user.IsDbAdmin(db) && !user.HasWriteAccess(seriesName) {
		return false, common.NewAuthorizationError("Insufficient permissions to drop series")
	}

	return true, ""
}

func (self *Permissions) AuthorizeListContinuousQueries(user common.User, db string) (ok bool, err common.AuthorizationError) {
	if !user.IsDbAdmin(db) {
		return false, common.NewAuthorizationError("Insufficient permissions to list continuous queries")
	}

	return true, ""
}

func (self *Permissions) AuthorizeChangeDbUserPermissions(user common.User, db string) (ok bool, err common.AuthorizationError) {
	if !user.IsDbAdmin(db) {
		return false, common.NewAuthorizationError("Insufficient permissions to change db user permissions on %s", db)
	}

	return true, ""
}

func (self *Permissions) AuthorizeGrantDbUserAdmin(user common.User, db string) (ok bool, err common.AuthorizationError) {
	if !user.IsDbAdmin(db) {
		return false, common.NewAuthorizationError("Insufficient permissions to grant db user admin privileges on %s", db)
	}

	return true, ""
}

func (self *CoordinatorImpl) DropDatabase(user common.User, db string) error {
	if !user.IsClusterAdmin() {
		return fmt.Errorf("Insufficient permission to drop database")
	}

	return self.raftServer.DropDatabase(db)
}

func (self *CoordinatorImpl) ListContinuousQueries(user common.User, db string) ([]*protocol.Series, error) {
	if !user.IsClusterAdmin() && !user.IsDbAdmin(db) {
		return nil, common.NewAuthorizationError("Insufficient permissions to list continuous queries")
	}

	queries := self.clusterConfiguration.GetContinuousQueries(db)
	points := []*protocol.Point{}

	for _, query := range queries {
		queryId := int64(query.Id)
		queryString := query.Query
		timestamp := time.Now().Unix()
		sequenceNumber := uint64(1)
		points = append(points, &protocol.Point{
			Values: []*protocol.FieldValue{
				&protocol.FieldValue{Int64Value: &queryId},
				&protocol.FieldValue{StringValue: &queryString},
			},
			Timestamp:      &timestamp,
			SequenceNumber: &sequenceNumber,
		})
	}
	seriesName := "continuous queries"
	series := []*protocol.Series{&protocol.Series{
		Name:   &seriesName,
		Fields: []string{"id", "query"},
		Points: points,
	}}
	return series, nil
}

func (self *CoordinatorImpl) CreateDbUser(requester common.User, db, username, password string) error {
	if !requester.IsClusterAdmin() && !requester.IsDbAdmin(db) {
		return common.NewAuthorizationError("Insufficient permissions")
	}

	if username == "" {
		return fmt.Errorf("Username cannot be empty")
	}

	if !isValidName(username) {
		return fmt.Errorf("%s isn't a valid username", username)
	}

	hash, err := cluster.HashPassword(password)
	if err != nil {
		return err
	}

	self.CreateDatabase(requester, db, uint8(1)) // ignore the error since the db may exist
	if self.clusterConfiguration.GetDbUser(db, username) != nil {
		return fmt.Errorf("User %s already exists", username)
	}
	matchers := []*cluster.Matcher{&cluster.Matcher{true, ".*"}}
	log.Debug("(raft:%s) Creating user %s:%s", self.raftServer.(*RaftServer).raftServer.Name(), db, username)
	return self.raftServer.SaveDbUser(&cluster.DbUser{cluster.CommonUser{
		Name:     username,
		Hash:     string(hash),
		CacheKey: db + "%" + username,
	}, db, matchers, matchers, false})
}

func (self *Permissions) AuthorizeChangeClusterAdminPassword(user common.User) (ok bool, err common.AuthorizationError) {
	if !user.IsClusterAdmin() {
		return false, common.NewAuthorizationError("Insufficient permissions to change cluster admin password")
	}

	return true, ""
}

func (self *CoordinatorImpl) ListDatabases(user common.User) ([]string, error) {
	if !user.IsClusterAdmin() {
		return nil, fmt.Errorf("Insufficient permission to list databases")
	}

	dbs := self.clusterConfiguration.GetDatabases()
	return dbs, nil
}

func (self *CoordinatorImpl) CreateSubscription(requester common.User, subscription *cluster.Subscription) error {
	if !requester.IsClusterAdmin() {
		return common.NewAuthorizationError("Insufficient permissions")
	}

	return self.raftServer.SaveSubscription(subscription)
	return nil
}