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request.go
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request.go
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// Copyright 2022 Fraunhofer AISEC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// $$\ $$\ $$\ $$\
// $$ | $$ |\__| $$ |
// $$$$$$$\ $$ | $$$$$$\ $$\ $$\ $$$$$$$ |$$\ $$$$$$\ $$$$$$\ $$$$$$\
// $$ _____|$$ |$$ __$$\ $$ | $$ |$$ __$$ |$$ |\_$$ _| $$ __$$\ $$ __$$\
// $$ / $$ |$$ / $$ |$$ | $$ |$$ / $$ |$$ | $$ | $$ / $$ |$$ | \__|
// $$ | $$ |$$ | $$ |$$ | $$ |$$ | $$ |$$ | $$ |$$\ $$ | $$ |$$ |
// \$$$$$$\ $$ |\$$$$$ |\$$$$$ |\$$$$$$ |$$ | \$$$ |\$$$$$ |$$ |
// \_______|\__| \______/ \______/ \_______|\__| \____/ \______/ \__|
//
// This file is part of Clouditor Community Edition.
package api
import (
"errors"
"strings"
"golang.org/x/exp/slices"
"google.golang.org/protobuf/proto"
"clouditor.io/clouditor/internal/util"
)
var (
ErrInvalidColumnName = errors.New("column name is invalid")
ErrRequestIsNil = errors.New("request is empty")
)
func ValidateListRequest[T proto.Message](req PaginatedRequest) (err error) {
// req must be non-nil
if req == nil {
err = ErrRequestIsNil
return
}
// Avoid DB injections by whitelisting the valid orderBy statements
whitelist := createWhitelist[T]()
normalizedReq := strings.ToLower(req.GetOrderBy())
if !slices.Contains(whitelist, normalizedReq) {
err = ErrInvalidColumnName
return
}
return
}
// createWhitelist creates a whitelist out of fields of struct T. Returns error if T is no struct.
func createWhitelist[T proto.Message]() (whitelist []string) {
whitelist = util.GetFieldNames[T]()
// Add empty string indicating no explicit ordering
whitelist = append(whitelist, "")
return
}