mirror of
https://github.com/kubernetes-sigs/external-dns.git
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6e2fc4aa31
* chore(codebase): enable linter nonamedreturns Signed-off-by: ivan katliarchuk <ivan.katliarchuk@gmail.com> * chore(codebase): enable linter nonamedreturns Signed-off-by: ivan katliarchuk <ivan.katliarchuk@gmail.com> --------- Signed-off-by: ivan katliarchuk <ivan.katliarchuk@gmail.com>
95 lines
2.5 KiB
Go
95 lines
2.5 KiB
Go
/*
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Copyright 2025 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package fqdn
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import (
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"bytes"
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"fmt"
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"net/netip"
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"strings"
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"text/template"
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"unicode"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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)
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func ParseTemplate(input string) (*template.Template, error) {
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if input == "" {
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return nil, nil
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}
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funcs := template.FuncMap{
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"contains": strings.Contains,
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"trimPrefix": strings.TrimPrefix,
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"trimSuffix": strings.TrimSuffix,
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"trim": strings.TrimSpace,
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"toLower": strings.ToLower,
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"replace": replace,
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"isIPv6": isIPv6String,
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"isIPv4": isIPv4String,
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}
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return template.New("endpoint").Funcs(funcs).Parse(input)
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}
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type kubeObject interface {
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runtime.Object
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metav1.Object
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}
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func ExecTemplate(tmpl *template.Template, obj kubeObject) ([]string, error) {
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if obj == nil {
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return nil, fmt.Errorf("object is nil")
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}
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var buf bytes.Buffer
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if err := tmpl.Execute(&buf, obj); err != nil {
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kind := obj.GetObjectKind().GroupVersionKind().Kind
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return nil, fmt.Errorf("failed to apply template on %s %s/%s: %w", kind, obj.GetNamespace(), obj.GetName(), err)
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}
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var hostnames []string
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for _, name := range strings.Split(buf.String(), ",") {
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name = strings.TrimFunc(name, unicode.IsSpace)
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name = strings.TrimSuffix(name, ".")
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hostnames = append(hostnames, name)
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}
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return hostnames, nil
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}
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// replace all instances of oldValue with newValue in target string.
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// adheres to syntax from https://masterminds.github.io/sprig/strings.html.
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func replace(oldValue, newValue, target string) string {
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return strings.ReplaceAll(target, oldValue, newValue)
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}
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// isIPv6String reports whether the target string is an IPv6 address,
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// including IPv4-mapped IPv6 addresses.
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func isIPv6String(target string) bool {
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netIP, err := netip.ParseAddr(target)
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if err != nil {
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return false
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}
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return netIP.Is6()
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}
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// isIPv4String reports whether the target string is an IPv4 address.
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func isIPv4String(target string) bool {
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netIP, err := netip.ParseAddr(target)
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if err != nil {
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return false
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}
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return netIP.Is4()
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}
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