diff options
Diffstat (limited to 'plugin/metadata/provider.go')
| -rw-r--r-- | plugin/metadata/provider.go | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/plugin/metadata/provider.go b/plugin/metadata/provider.go index eb7bb9755..276a44127 100644 --- a/plugin/metadata/provider.go +++ b/plugin/metadata/provider.go @@ -32,6 +32,7 @@ package metadata import ( "context" + "strings" "github.com/coredns/coredns/request" ) @@ -48,6 +49,21 @@ type Provider interface { // Func is the type of function in the metadata, when called they return the value of the label. type Func func() string +// IsLabel check that the provided name looks like a valid label name +func IsLabel(label string) bool { + p := strings.Index(label, "/") + if p <= 0 || p >= len(label)-1 { + // cannot accept namespace empty nor label empty + return false + } + if strings.LastIndex(label, "/") != p { + // several slash in the Label + return false + } + return true + +} + // Labels returns all metadata keys stored in the context. These label names should be named // as: plugin/NAME, where NAME is something descriptive. func Labels(ctx context.Context) []string { |