/*
Copyright 2020 The cert-manager 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 selfsigned

import (
	"context"
	"time"

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

	"github.com/cert-manager/cert-manager/e2e-tests/framework"
	"github.com/cert-manager/cert-manager/e2e-tests/framework/helper/validation/certificaterequests"
	"github.com/cert-manager/cert-manager/e2e-tests/util"
	"github.com/cert-manager/cert-manager/pkg/apis/certmanager"
	v1 "github.com/cert-manager/cert-manager/pkg/apis/certmanager/v1"
	cmmeta "github.com/cert-manager/cert-manager/pkg/apis/meta/v1"
	"github.com/cert-manager/cert-manager/test/unit/gen"

	. "github.com/onsi/ginkgo/v2"
	. "github.com/onsi/gomega"
)

var _ = framework.CertManagerDescribe("SelfSigned CertificateRequest", func() {
	f := framework.NewDefaultFramework("create-selfsigned-certificaterequest")
	h := f.Helper()

	var basicCR *v1.CertificateRequest
	issuerName := "test-selfsigned-issuer"
	certificateRequestName := "test-selfsigned-certificaterequest"
	certificateRequestSecretName := "test-selfsigned-private-key"

	JustBeforeEach(func(testingCtx context.Context) {
		By("Creating an Issuer")
		issuer := gen.Issuer(issuerName,
			gen.SetIssuerNamespace(f.Namespace.Name),
			gen.SetIssuerSelfSigned(v1.SelfSignedIssuer{}))
		_, err := f.CertManagerClientSet.CertmanagerV1().Issuers(f.Namespace.Name).Create(testingCtx, issuer, metav1.CreateOptions{})
		Expect(err).NotTo(HaveOccurred())
		By("Waiting for Issuer to become Ready")
		err = util.WaitForIssuerCondition(testingCtx, f.CertManagerClientSet.CertmanagerV1().Issuers(f.Namespace.Name),
			issuerName,
			v1.IssuerCondition{
				Type:   v1.IssuerConditionReady,
				Status: cmmeta.ConditionTrue,
			})
		Expect(err).NotTo(HaveOccurred())

		By("Building CertificateRequest")
		basicCR = gen.CertificateRequest(certificateRequestName,
			gen.SetCertificateRequestNamespace(f.Namespace.Name),
			gen.SetCertificateRequestIsCA(true),
			gen.SetCertificateRequestIssuer(cmmeta.IssuerReference{
				Name:  issuerName,
				Group: certmanager.GroupName,
				Kind:  "Issuer",
			}),
			gen.AddCertificateRequestAnnotations(map[string]string{
				v1.CertificateRequestPrivateKeyAnnotationKey: certificateRequestSecretName,
			}),
		)
	})

	AfterEach(func(testingCtx context.Context) {
		By("Cleaning up")
		err := f.KubeClientSet.CoreV1().Secrets(f.Namespace.Name).Delete(testingCtx, certificateRequestSecretName, metav1.DeleteOptions{})
		Expect(err).NotTo(HaveOccurred())
		err = f.CertManagerClientSet.CertmanagerV1().Issuers(f.Namespace.Name).Delete(testingCtx, issuerName, metav1.DeleteOptions{})
		Expect(err).NotTo(HaveOccurred())
	})

	Context("Self Signed and private key", func() {

		BeforeEach(func(testingCtx context.Context) {
			By("Creating a signing keypair fixture")
			_, err := f.KubeClientSet.CoreV1().Secrets(f.Namespace.Name).Create(testingCtx, newPrivateKeySecret(
				certificateRequestSecretName, f.Namespace.Name, rootRSAKey), metav1.CreateOptions{})
			Expect(err).NotTo(HaveOccurred())
		})

		It("should generate a valid certificate from CSR backed by a RSA key", func(testingCtx context.Context) {
			crClient := f.CertManagerClientSet.CertmanagerV1().CertificateRequests(f.Namespace.Name)

			By("Creating a CertificateRequest")
			csr, err := generateRSACSR()
			Expect(err).NotTo(HaveOccurred())

			_, err = crClient.Create(testingCtx, gen.CertificateRequestFrom(basicCR,
				gen.SetCertificateRequestCSR(csr),
			), metav1.CreateOptions{})
			Expect(err).NotTo(HaveOccurred())

			By("Verifying the Certificate is valid")
			err = h.WaitCertificateRequestIssuedValid(testingCtx, f.Namespace.Name, certificateRequestName, time.Second*30, rootRSAKeySigner)
			Expect(err).NotTo(HaveOccurred())
		})

		It("should be able to obtain an ECDSA Certificate backed by a ECDSA key", func(testingCtx context.Context) {
			// Replace RSA key secret with ECDSA one
			_, err := f.KubeClientSet.CoreV1().Secrets(f.Namespace.Name).Update(testingCtx, newPrivateKeySecret(
				certificateRequestSecretName, f.Namespace.Name, rootECKey), metav1.UpdateOptions{})
			Expect(err).NotTo(HaveOccurred())

			crClient := f.CertManagerClientSet.CertmanagerV1().CertificateRequests(f.Namespace.Name)
			By("Creating a CertificateRequest")
			csr, err := generateECCSR()
			Expect(err).NotTo(HaveOccurred())

			_, err = crClient.Create(testingCtx, gen.CertificateRequestFrom(basicCR,
				gen.SetCertificateRequestCSR(csr),
			), metav1.CreateOptions{})
			Expect(err).NotTo(HaveOccurred())

			By("Verifying the Certificate is valid")
			err = h.WaitCertificateRequestIssuedValid(testingCtx, f.Namespace.Name, certificateRequestName, time.Second*30, rootECKeySigner)
			Expect(err).NotTo(HaveOccurred())
		})

		It("should be able to obtain an Ed25519 Certificate backed by a Ed25519 key", func(testingCtx context.Context) {
			// Replace previous key secret with Ed25519 one
			_, err := f.KubeClientSet.CoreV1().Secrets(f.Namespace.Name).Update(testingCtx, newPrivateKeySecret(
				certificateRequestSecretName, f.Namespace.Name, rootEd25519Key), metav1.UpdateOptions{})
			Expect(err).NotTo(HaveOccurred())

			crClient := f.CertManagerClientSet.CertmanagerV1().CertificateRequests(f.Namespace.Name)
			By("Creating a CertificateRequest")
			csr, err := generateEd25519CSR()
			Expect(err).NotTo(HaveOccurred())

			_, err = crClient.Create(testingCtx, gen.CertificateRequestFrom(basicCR,
				gen.SetCertificateRequestCSR(csr),
			), metav1.CreateOptions{})
			Expect(err).NotTo(HaveOccurred())

			By("Verifying the Certificate is valid")
			err = h.WaitCertificateRequestIssuedValid(testingCtx, f.Namespace.Name, certificateRequestName, time.Second*30, rootEd25519Signer)
			Expect(err).NotTo(HaveOccurred())
		})

		cases := []struct {
			inputDuration    *metav1.Duration
			expectedDuration time.Duration
			label            string
		}{
			{
				inputDuration:    &metav1.Duration{Duration: time.Hour * 24 * 35},
				expectedDuration: time.Hour * 24 * 35,
				label:            "35 days",
			},
			{
				inputDuration:    nil,
				expectedDuration: time.Hour * 24 * 90,
				label:            "the default duration (90 days)",
			},
		}
		for _, v := range cases {
			It("should generate a signed certificate valid for "+v.label, func(testingCtx context.Context) {
				crClient := f.CertManagerClientSet.CertmanagerV1().CertificateRequests(f.Namespace.Name)

				By("Creating a CertificateRequest")
				csr, err := generateRSACSR()
				Expect(err).NotTo(HaveOccurred())

				_, err = crClient.Create(testingCtx, gen.CertificateRequestFrom(basicCR,
					gen.SetCertificateRequestCSR(csr),
					gen.SetCertificateRequestDuration(v.inputDuration),
				), metav1.CreateOptions{})
				Expect(err).NotTo(HaveOccurred())

				By("Verifying the CertificateRequest is valid")
				err = h.WaitCertificateRequestIssuedValid(testingCtx, f.Namespace.Name, certificateRequestName, time.Second*30, rootRSAKeySigner)
				Expect(err).NotTo(HaveOccurred())
				err = h.ValidateCertificateRequest(types.NamespacedName{
					Namespace: f.Namespace.Name,
					Name:      certificateRequestName,
				}, rootRSAKeySigner, certificaterequests.ExpectDuration(v.expectedDuration, 0))
				Expect(err).NotTo(HaveOccurred())
			})
		}
	})
})
