/*
Copyright 2016 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 common

import (
	"k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/util/uuid"
	"k8s.io/kubernetes/test/e2e/framework"

	. "github.com/onsi/ginkgo"
	. "github.com/onsi/gomega"
)

// These tests exercise the Kubernetes expansion syntax $(VAR).
// For more information, see:
// https://github.com/kubernetes/community/blob/master/contributors/design-proposals/node/expansion.md
var _ = framework.KubeDescribe("Variable Expansion", func() {
	f := framework.NewDefaultFramework("var-expansion")

	/*
		    Testname: var-expansion-env
		    Description: Make sure environment variables can be set using an
			expansion of previously defined environment variables
	*/
	framework.ConformanceIt("should allow composing env vars into new env vars [NodeConformance]", func() {
		podName := "var-expansion-" + string(uuid.NewUUID())
		pod := &v1.Pod{
			ObjectMeta: metav1.ObjectMeta{
				Name:   podName,
				Labels: map[string]string{"name": podName},
			},
			Spec: v1.PodSpec{
				Containers: []v1.Container{
					{
						Name:    "dapi-container",
						Image:   busyboxImage,
						Command: []string{"sh", "-c", "env"},
						Env: []v1.EnvVar{
							{
								Name:  "FOO",
								Value: "foo-value",
							},
							{
								Name:  "BAR",
								Value: "bar-value",
							},
							{
								Name:  "FOOBAR",
								Value: "$(FOO);;$(BAR)",
							},
						},
					},
				},
				RestartPolicy: v1.RestartPolicyNever,
			},
		}

		f.TestContainerOutput("env composition", pod, 0, []string{
			"FOO=foo-value",
			"BAR=bar-value",
			"FOOBAR=foo-value;;bar-value",
		})
	})

	/*
		    Testname: var-expansion-command
		    Description: Make sure a container's commands can be set using an
			expansion of environment variables.
	*/
	framework.ConformanceIt("should allow substituting values in a container's command [NodeConformance]", func() {
		podName := "var-expansion-" + string(uuid.NewUUID())
		pod := &v1.Pod{
			ObjectMeta: metav1.ObjectMeta{
				Name:   podName,
				Labels: map[string]string{"name": podName},
			},
			Spec: v1.PodSpec{
				Containers: []v1.Container{
					{
						Name:    "dapi-container",
						Image:   busyboxImage,
						Command: []string{"sh", "-c", "TEST_VAR=wrong echo \"$(TEST_VAR)\""},
						Env: []v1.EnvVar{
							{
								Name:  "TEST_VAR",
								Value: "test-value",
							},
						},
					},
				},
				RestartPolicy: v1.RestartPolicyNever,
			},
		}

		f.TestContainerOutput("substitution in container's command", pod, 0, []string{
			"test-value",
		})
	})

	/*
		    Testname: var-expansion-arg
		    Description: Make sure a container's args can be set using an
			expansion of environment variables.
	*/
	framework.ConformanceIt("should allow substituting values in a container's args [NodeConformance]", func() {
		podName := "var-expansion-" + string(uuid.NewUUID())
		pod := &v1.Pod{
			ObjectMeta: metav1.ObjectMeta{
				Name:   podName,
				Labels: map[string]string{"name": podName},
			},
			Spec: v1.PodSpec{
				Containers: []v1.Container{
					{
						Name:    "dapi-container",
						Image:   busyboxImage,
						Command: []string{"sh", "-c"},
						Args:    []string{"TEST_VAR=wrong echo \"$(TEST_VAR)\""},
						Env: []v1.EnvVar{
							{
								Name:  "TEST_VAR",
								Value: "test-value",
							},
						},
					},
				},
				RestartPolicy: v1.RestartPolicyNever,
			},
		}

		f.TestContainerOutput("substitution in container's args", pod, 0, []string{
			"test-value",
		})
	})

	/*
		    Testname: var-expansion-subpath
		    Description: Make sure a container's subpath can be set using an
			expansion of environment variables.
	*/
	It("should allow substituting values in a volume subpath [Feature:VolumeSubpathEnvExpansion][NodeAlphaFeature:VolumeSubpathEnvExpansion]", func() {
		podName := "var-expansion-" + string(uuid.NewUUID())
		pod := &v1.Pod{
			ObjectMeta: metav1.ObjectMeta{
				Name:   podName,
				Labels: map[string]string{"name": podName},
			},
			Spec: v1.PodSpec{
				Containers: []v1.Container{
					{
						Name:    "dapi-container",
						Image:   busyboxImage,
						Command: []string{"sh", "-c", "test -d /testcontainer/" + podName + ";echo $?"},
						Env: []v1.EnvVar{
							{
								Name:  "POD_NAME",
								Value: podName,
							},
						},
						VolumeMounts: []v1.VolumeMount{
							{
								Name:      "workdir1",
								MountPath: "/logscontainer",
								SubPath:   "$(POD_NAME)",
							},
							{
								Name:      "workdir2",
								MountPath: "/testcontainer",
							},
						},
					},
				},
				RestartPolicy: v1.RestartPolicyNever,
				Volumes: []v1.Volume{
					{
						Name: "workdir1",
						VolumeSource: v1.VolumeSource{
							HostPath: &v1.HostPathVolumeSource{Path: "/tmp"},
						},
					},
					{
						Name: "workdir2",
						VolumeSource: v1.VolumeSource{
							HostPath: &v1.HostPathVolumeSource{Path: "/tmp"},
						},
					},
				},
			},
		}

		f.TestContainerOutput("substitution in volume subpath", pod, 0, []string{
			"0",
		})
	})

	/*
		    Testname: var-expansion-subpath-with-backticks
		    Description: Make sure a container's subpath can not be set using an
			expansion of environment variables when backticks are supplied.
	*/
	It("should fail substituting values in a volume subpath with backticks [Feature:VolumeSubpathEnvExpansion][NodeAlphaFeature:VolumeSubpathEnvExpansion][Slow]", func() {

		podName := "var-expansion-" + string(uuid.NewUUID())
		pod := &v1.Pod{
			ObjectMeta: metav1.ObjectMeta{
				Name:   podName,
				Labels: map[string]string{"name": podName},
			},
			Spec: v1.PodSpec{
				Containers: []v1.Container{
					{
						Name:  "dapi-container",
						Image: busyboxImage,
						Env: []v1.EnvVar{
							{
								Name:  "POD_NAME",
								Value: "..",
							},
						},
						VolumeMounts: []v1.VolumeMount{
							{
								Name:      "workdir1",
								MountPath: "/logscontainer",
								SubPath:   "$(POD_NAME)",
							},
						},
					},
				},
				RestartPolicy: v1.RestartPolicyNever,
				Volumes: []v1.Volume{
					{
						Name: "workdir1",
						VolumeSource: v1.VolumeSource{
							EmptyDir: &v1.EmptyDirVolumeSource{},
						},
					},
				},
			},
		}

		// Pod should fail
		testPodFailSubpath(f, pod)
	})

	/*
		    Testname: var-expansion-subpath-with-absolute-path
		    Description: Make sure a container's subpath can not be set using an
			expansion of environment variables when absolute path is supplied.
	*/
	It("should fail substituting values in a volume subpath with absolute path [Feature:VolumeSubpathEnvExpansion][NodeAlphaFeature:VolumeSubpathEnvExpansion][Slow]", func() {

		podName := "var-expansion-" + string(uuid.NewUUID())
		pod := &v1.Pod{
			ObjectMeta: metav1.ObjectMeta{
				Name:   podName,
				Labels: map[string]string{"name": podName},
			},
			Spec: v1.PodSpec{
				Containers: []v1.Container{
					{
						Name:  "dapi-container",
						Image: busyboxImage,
						Env: []v1.EnvVar{
							{
								Name:  "POD_NAME",
								Value: "/tmp",
							},
						},
						VolumeMounts: []v1.VolumeMount{
							{
								Name:      "workdir1",
								MountPath: "/logscontainer",
								SubPath:   "$(POD_NAME)",
							},
						},
					},
				},
				RestartPolicy: v1.RestartPolicyNever,
				Volumes: []v1.Volume{
					{
						Name: "workdir1",
						VolumeSource: v1.VolumeSource{
							EmptyDir: &v1.EmptyDirVolumeSource{},
						},
					},
				},
			},
		}

		// Pod should fail
		testPodFailSubpath(f, pod)
	})
})

func testPodFailSubpath(f *framework.Framework, pod *v1.Pod) {

	pod, err := f.ClientSet.CoreV1().Pods(f.Namespace.Name).Create(pod)
	Expect(err).ToNot(HaveOccurred(), "while creating pod")

	defer func() {
		framework.DeletePodWithWait(f, f.ClientSet, pod)
	}()

	err = framework.WaitTimeoutForPodRunningInNamespace(f.ClientSet, pod.Name, pod.Namespace, framework.PodStartShortTimeout)
	Expect(err).To(HaveOccurred(), "while waiting for pod to be running")
}