mirror of
https://github.com/kubernetes-sigs/external-dns.git
synced 2025-10-31 10:41:16 +01:00
107 lines
3.3 KiB
Go
107 lines
3.3 KiB
Go
/*
|
|
Copyright 2017 The Kubernetes 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 endpoint
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"sort"
|
|
"strings"
|
|
)
|
|
|
|
var (
|
|
// ErrInvalidHeritage is returned when heritage was not found, or different heritage is found
|
|
ErrInvalidHeritage = errors.New("heritage is unknown or not found")
|
|
)
|
|
|
|
const (
|
|
heritage = "external-dns"
|
|
// OwnerLabelKey is the name of the label that defines the owner of an Endpoint.
|
|
OwnerLabelKey = "owner"
|
|
// ResourceLabelKey is the name of the label that identifies k8s resource which wants to acquire the DNS name
|
|
ResourceLabelKey = "resource"
|
|
|
|
// AWSSDDescriptionLabel label responsible for storing raw owner/resource combination information in the Labels
|
|
// supposed to be inserted by AWS SD Provider, and parsed into OwnerLabelKey and ResourceLabelKey key by AWS SD Registry
|
|
AWSSDDescriptionLabel = "aws-sd-description"
|
|
|
|
// DualstackLabelKey is the name of the label that identifies dualstack endpoints
|
|
DualstackLabelKey = "dualstack"
|
|
)
|
|
|
|
// Labels store metadata related to the endpoint
|
|
// it is then stored in a persistent storage via serialization
|
|
type Labels map[string]string
|
|
|
|
// NewLabels returns empty Labels
|
|
func NewLabels() Labels {
|
|
return map[string]string{}
|
|
}
|
|
|
|
// NewLabelsFromString constructs endpoints labels from a provided format string
|
|
// if heritage set to another value is found then error is returned
|
|
// no heritage automatically assumes is not owned by external-dns and returns invalidHeritage error
|
|
func NewLabelsFromString(labelText string) (Labels, error) {
|
|
endpointLabels := map[string]string{}
|
|
labelText = strings.Trim(labelText, "\"") // drop quotes
|
|
tokens := strings.Split(labelText, ",")
|
|
foundExternalDNSHeritage := false
|
|
for _, token := range tokens {
|
|
if len(strings.Split(token, "=")) != 2 {
|
|
continue
|
|
}
|
|
key := strings.Split(token, "=")[0]
|
|
val := strings.Split(token, "=")[1]
|
|
if key == "heritage" && val != heritage {
|
|
return nil, ErrInvalidHeritage
|
|
}
|
|
if key == "heritage" {
|
|
foundExternalDNSHeritage = true
|
|
continue
|
|
}
|
|
if strings.HasPrefix(key, heritage) {
|
|
endpointLabels[strings.TrimPrefix(key, heritage+"/")] = val
|
|
}
|
|
}
|
|
|
|
if !foundExternalDNSHeritage {
|
|
return nil, ErrInvalidHeritage
|
|
}
|
|
|
|
return endpointLabels, nil
|
|
}
|
|
|
|
// Serialize transforms endpoints labels into a external-dns recognizable format string
|
|
// withQuotes adds additional quotes
|
|
func (l Labels) Serialize(withQuotes bool) string {
|
|
var tokens []string
|
|
tokens = append(tokens, fmt.Sprintf("heritage=%s", heritage))
|
|
var keys []string
|
|
for key := range l {
|
|
keys = append(keys, key)
|
|
}
|
|
sort.Strings(keys) // sort for consistency
|
|
|
|
for _, key := range keys {
|
|
tokens = append(tokens, fmt.Sprintf("%s/%s=%s", heritage, key, l[key]))
|
|
}
|
|
if withQuotes {
|
|
return fmt.Sprintf("\"%s\"", strings.Join(tokens, ","))
|
|
}
|
|
return strings.Join(tokens, ",")
|
|
}
|