/*
Copyright 2022 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 settings

import (
	"context"
	"crypto/tls"
	"net"
	"net/http"
	"strings"

	"github.com/onsi/ginkgo/v2"
	"github.com/stretchr/testify/assert"
	appsv1 "k8s.io/api/apps/v1"
	corev1 "k8s.io/api/core/v1"

	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"

	"k8s.io/ingress-nginx/test/e2e/framework"
)

var _ = framework.IngressNginxDescribe("[Flag] enable-ssl-passthrough", func() {
	f := framework.NewDefaultFramework("ssl-passthrough", framework.WithHTTPBunEnabled())

	ginkgo.BeforeEach(func() {
		err := f.UpdateIngressControllerDeployment(func(deployment *appsv1.Deployment) error {
			args := deployment.Spec.Template.Spec.Containers[0].Args
			args = append(args, "--enable-ssl-passthrough")
			deployment.Spec.Template.Spec.Containers[0].Args = args
			_, err := f.KubeClientSet.AppsV1().Deployments(f.Namespace).Update(context.TODO(), deployment, metav1.UpdateOptions{})
			return err
		})
		assert.Nil(ginkgo.GinkgoT(), err, "updating ingress controller deployment flags")

		f.WaitForNginxServer("_",
			func(server string) bool {
				return strings.Contains(server, "listen 442")
			})
	})

	ginkgo.Describe("With enable-ssl-passthrough enabled", func() {
		ginkgo.It("should enable ssl-passthrough-proxy-port on a different port", func() {
			err := f.UpdateIngressControllerDeployment(func(deployment *appsv1.Deployment) error {
				args := deployment.Spec.Template.Spec.Containers[0].Args
				args = append(args, "--ssl-passthrough-proxy-port=1442")
				deployment.Spec.Template.Spec.Containers[0].Args = args
				_, err := f.KubeClientSet.AppsV1().Deployments(f.Namespace).Update(context.TODO(), deployment, metav1.UpdateOptions{})
				return err
			})
			assert.Nil(ginkgo.GinkgoT(), err, "updating ingress controller deployment flags")

			f.WaitForNginxServer("_",
				func(server string) bool {
					return strings.Contains(server, "listen 1442")
				})

			f.HTTPTestClient().
				GET("/").
				WithHeader("Host", "something").
				Expect().
				Status(http.StatusNotFound)
		})

		ginkgo.It("should pass unknown traffic to default backend and handle known traffic", func() {
			host := "testpassthrough.com"
			echoName := "echopass"

			/* Even with enable-ssl-passthrough enabled, only annotated ingresses may receive the traffic */
			annotations := map[string]string{
				"nginx.ingress.kubernetes.io/ssl-passthrough": "true",
			}

			ingressDef := framework.NewSingleIngressWithTLS(host,
				"/",
				host,
				[]string{host},
				f.Namespace,
				echoName,
				80,
				annotations)
			tlsConfig, err := framework.CreateIngressTLSSecret(f.KubeClientSet,
				ingressDef.Spec.TLS[0].Hosts,
				ingressDef.Spec.TLS[0].SecretName,
				ingressDef.Namespace)

			volumeMount := []corev1.VolumeMount{
				{
					Name:      "certs",
					ReadOnly:  true,
					MountPath: "/certs",
				},
			}
			volume := []corev1.Volume{
				{
					Name: "certs",
					VolumeSource: corev1.VolumeSource{
						Secret: &corev1.SecretVolumeSource{
							SecretName: ingressDef.Spec.TLS[0].SecretName,
						},
					},
				},
			}
			envs := []corev1.EnvVar{
				{
					Name:  "HTTPBUN_SSL_CERT",
					Value: "/certs/tls.crt",
				},
				{
					Name:  "HTTPBUN_SSL_KEY",
					Value: "/certs/tls.key",
				},
			}

			f.NewDeploymentWithOpts("echopass",
				framework.HTTPBunImage,
				80,
				1,
				nil,
				nil,
				envs,
				volumeMount,
				volume,
				false)

			f.EnsureIngress(ingressDef)

			assert.Nil(ginkgo.GinkgoT(), err)
			framework.WaitForTLS(f.GetURL(framework.HTTPS), tlsConfig)

			f.WaitForNginxServer(host,
				func(server string) bool {
					return strings.Contains(server, "listen 442")
				})

			/* This one should not receive traffic as it does not contain passthrough annotation */
			hostBad := "noannotationnopassthrough.com"
			ingBad := f.EnsureIngress(framework.NewSingleIngressWithTLS(hostBad,
				"/",
				hostBad,
				[]string{hostBad},
				f.Namespace,
				echoName,
				80,
				nil))
			tlsConfigBad, err := framework.CreateIngressTLSSecret(f.KubeClientSet,
				ingBad.Spec.TLS[0].Hosts,
				ingBad.Spec.TLS[0].SecretName,
				ingBad.Namespace)
			assert.Nil(ginkgo.GinkgoT(), err)
			framework.WaitForTLS(f.GetURL(framework.HTTPS), tlsConfigBad)

			f.WaitForNginxServer(hostBad,
				func(server string) bool {
					return strings.Contains(server, "listen 442")
				})

			//nolint:gosec // Ignore the gosec error in testing
			f.HTTPTestClientWithTLSConfig(&tls.Config{ServerName: host, InsecureSkipVerify: true}).
				GET("/").
				WithURL("https://"+net.JoinHostPort(host, "443")).
				ForceResolve(f.GetNginxIP(), 443).
				Expect().
				Status(http.StatusOK)

			//nolint:gosec // Ignore the gosec error in testing
			f.HTTPTestClientWithTLSConfig(&tls.Config{ServerName: hostBad, InsecureSkipVerify: true}).
				GET("/").
				WithURL("https://"+net.JoinHostPort(hostBad, "443")).
				ForceResolve(f.GetNginxIP(), 443).
				Expect().
				Status(http.StatusNotFound)
		})
	})
})