56 lines
1.4 KiB
Go
56 lines
1.4 KiB
Go
// Copyright 2017, OpenCensus Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package tag
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import "errors"
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const (
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maxKeyLength = 255
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// valid are restricted to US-ASCII subset (range 0x20 (' ') to 0x7e ('~')).
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validKeyValueMin = 32
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validKeyValueMax = 126
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)
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var (
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errInvalidKeyName = errors.New("invalid key name: only ASCII characters accepted; max length must be 255 characters")
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errInvalidValue = errors.New("invalid value: only ASCII characters accepted; max length must be 255 characters")
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)
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func checkKeyName(name string) bool {
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if len(name) == 0 {
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return false
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}
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if len(name) > maxKeyLength {
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return false
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}
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return isASCII(name)
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}
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func isASCII(s string) bool {
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for _, c := range s {
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if (c < validKeyValueMin) || (c > validKeyValueMax) {
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return false
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}
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}
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return true
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}
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func checkValue(v string) bool {
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if len(v) > maxKeyLength {
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return false
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}
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return isASCII(v)
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}
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