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fieldmask.go
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fieldmask.go
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// Copyright © 2019 The Things Network Foundation, The Things Industries B.V.
//
// 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.
package validate
import (
"regexp"
"github.com/gogo/protobuf/types"
"go.thethings.network/lorawan-stack/pkg/errors"
)
var (
fieldMaskPathRegex = regexp.MustCompile("^[a-z0-9](?:[._]?[a-z0-9]){1,}$")
fieldMaskPathMaxLength = 256
errFieldMaskPath = errors.DefineInvalidArgument("fieldmaskpath", "`{fieldmaskpath}` may consist of only lowercase letters, numbers, underscores and dots. It may not start or end with a dot or underscore, or have two or more consecutive dots or underscores. Also, it must be between 2 and 256 characters in length.")
)
// FieldMaskPaths performs a basic sanity check on the allowed characters for valid fieldmask paths.
// Paths of a FieldMask may only contain lowercase letters, numbers, dots, underscores and must be between 2 and 256 characters in length.
func FieldMaskPaths(fm *types.FieldMask) error {
for _, path := range fm.Paths {
if len(path) > 256 || !fieldMaskPathRegex.MatchString(path) {
return errFieldMaskPath.WithAttributes("fieldmaskpath", path)
}
}
return nil
}