github.com/containerd/containerd@v22.0.0-20200918172823-438c87b8e050+incompatible/labels/validate.go (about)

     1  /*
     2     Copyright The containerd Authors.
     3  
     4     Licensed under the Apache License, Version 2.0 (the "License");
     5     you may not use this file except in compliance with the License.
     6     You may obtain a copy of the License at
     7  
     8         http://www.apache.org/licenses/LICENSE-2.0
     9  
    10     Unless required by applicable law or agreed to in writing, software
    11     distributed under the License is distributed on an "AS IS" BASIS,
    12     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13     See the License for the specific language governing permissions and
    14     limitations under the License.
    15  */
    16  
    17  package labels
    18  
    19  import (
    20  	"github.com/containerd/containerd/errdefs"
    21  	"github.com/pkg/errors"
    22  )
    23  
    24  const (
    25  	maxSize = 4096
    26  )
    27  
    28  // Validate a label's key and value are under 4096 bytes
    29  func Validate(k, v string) error {
    30  	if (len(k) + len(v)) > maxSize {
    31  		if len(k) > 10 {
    32  			k = k[:10]
    33  		}
    34  		return errors.Wrapf(errdefs.ErrInvalidArgument, "label key and value greater than maximum size (%d bytes), key: %s", maxSize, k)
    35  	}
    36  	return nil
    37  }