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ingress.go
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ingress.go
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package main
import (
"context"
"crypto/tls"
"flag"
"log"
"net/http"
"path/filepath"
"regexp"
"strings"
net "k8s.io/api/networking/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/util/homedir"
)
func getCluster() (*kubernetes.Clientset, error) {
var kubeconfig *string
if home := homedir.HomeDir(); home != "" {
kubeconfig = flag.String("kubeconfig", filepath.Join(home, ".kube", "config"), "(optional) absolute path to the kubeconfig file")
} else {
kubeconfig = flag.String("kubeconfig", "", "absolute path to the kubeconfig file")
}
flag.Parse()
// use the current context in kubeconfig
config, err := clientcmd.BuildConfigFromFlags("", *kubeconfig)
if err != nil {
panic(err.Error())
}
// return clientset
return kubernetes.NewForConfig(config)
}
// input clientset. return ingress items.
func getIngress(clientset kubernetes.Clientset) ([]net.Ingress, error) {
// get all ingresses
ingresses, err := clientset.NetworkingV1().Ingresses("").List(context.TODO(), metav1.ListOptions{})
if err != nil {
panic(err.Error())
}
// return ingress items
return ingresses.Items, nil
}
func inspectIngress(i []net.Ingress) ([]string, []string, []bool, []bool, []string, []string) {
// slice for hosts
var hs []string
// slice for backend
var bs []string
// slice for annotation keys
var ls []string
// slice for whitelist
var wl []bool
// slice for helm annotation
var hl []bool
var in []string
var ins []string
for value := range i {
ingName := &i[value].Name
ingNamespace := &i[value].Namespace
ingRuleHost := &i[value].Spec.Rules[0].Host
ingRulePath := &i[value].Spec.Rules[0].IngressRuleValue.HTTP.Paths[0].Path
ingBackendService := &i[value].Spec.Rules[0].IngressRuleValue.HTTP.Paths[0].Backend.Service.Name
ingAnnotation := &i[value].Annotations
// use regexp to replace these characters with nothing
re, err := regexp.Compile(`[().*?$+]`)
if err != nil {
log.Fatal(err)
}
*ingRulePath = re.ReplaceAllString(*ingRulePath, "")
// look for ' | ' in path, split it and put value in a slice.
split := strings.Split(*ingRulePath, "|")
for _, value := range split {
// check is value doesn't start with '/', if not add '/'.
if !strings.HasPrefix(value, "/") {
value = "/" + value
}
fullSlug := *ingRuleHost + value
hs = append(hs, fullSlug)
//bs = append(bs, *ingBackendService)
for i, _ := range *ingAnnotation {
ls = append(ls, i)
}
for _, j := range ls {
// Check if nginx whitelist annotation is there.
if j == "nginx.ingress.kubernetes.io/whitelist-source-range" {
wl = append(wl, true) //possible whitelist
} else {
wl = append(wl, false) //no nginx whitelist
}
// Check if helm annotation is there.
if j == "meta.helm.sh/release-name" || j == "helm.sh/chart" {
hl = append(hl, true) //possible helm chart
} else {
hl = append(hl, false) //no helm chart
}
}
bs = append(bs, *ingBackendService)
in = append(in, *ingName)
ins = append(ins, *ingNamespace)
}
}
return hs, bs, wl, hl, in, ins
}
func statusChecker(s string) bool {
// ignore expired certificates
http.DefaultTransport.(*http.Transport).TLSClientConfig = &tls.Config{InsecureSkipVerify: true}
_, err := http.Get(s)
var resp bool
if err != nil {
resp = false
} else {
resp = true
}
return resp
}
func deleteIngress(clientset kubernetes.Clientset, name string, namespace string) {
err := clientset.NetworkingV1().Ingresses(namespace).Delete(context.TODO(), name, metav1.DeleteOptions{})
if err != nil {
log.Fatal(err)
}
}