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-rw-r--r--vendor/go.opencensus.io/internal/sanitize.go50
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diff --git a/vendor/go.opencensus.io/internal/sanitize.go b/vendor/go.opencensus.io/internal/sanitize.go
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+++ b/vendor/go.opencensus.io/internal/sanitize.go
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+// Copyright 2017, OpenCensus Authors
+//
+// 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 internal
+
+import (
+ "strings"
+ "unicode"
+)
+
+const labelKeySizeLimit = 100
+
+// Sanitize returns a string that is trunacated to 100 characters if it's too
+// long, and replaces non-alphanumeric characters to underscores.
+func Sanitize(s string) string {
+ if len(s) == 0 {
+ return s
+ }
+ if len(s) > labelKeySizeLimit {
+ s = s[:labelKeySizeLimit]
+ }
+ s = strings.Map(sanitizeRune, s)
+ if unicode.IsDigit(rune(s[0])) {
+ s = "key_" + s
+ }
+ if s[0] == '_' {
+ s = "key" + s
+ }
+ return s
+}
+
+// converts anything that is not a letter or digit to an underscore
+func sanitizeRune(r rune) rune {
+ if unicode.IsLetter(r) || unicode.IsDigit(r) {
+ return r
+ }
+ // Everything else turns into an underscore
+ return '_'
+}