/*
Copyright 2022 CAcert Inc.
SPDX-License-Identifier: Apache-2.0

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 hsm_test

import (
	"crypto/x509"
	"log"
	"strings"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"git.cacert.org/cacert-gosigner/pkg/config"
	"git.cacert.org/cacert-gosigner/pkg/hsm"
)

func TestEnsureCAKeysAndCertificates_not_in_setup_mode(t *testing.T) {
	testConfig := setupSignerConfig(t)
	setupSoftHsm(t)

	t.Setenv("TOKEN_PIN_ACME_TEST_HSM", "123456")

	acc, err := hsm.NewAccess(log.Default(),
		hsm.CaConfigOption(testConfig),
		hsm.CADirectoryOption(t.TempDir()))
	assert.NoError(t, err)

	err = acc.EnsureCAKeysAndCertificates()

	t.Cleanup(func() {
		err := acc.CloseP11Contexts()
		assert.NoError(t, err)
	})

	assert.ErrorContains(t, err, "not in setup mode")
}

func prepareSoftHSM(t *testing.T) *hsm.Access {
	t.Helper()

	testConfig := setupSignerConfig(t)
	setupSoftHsm(t)

	t.Setenv("TOKEN_PIN_ACME_TEST_HSM", "123456")

	acc, err := hsm.NewAccess(log.Default(),
		hsm.CaConfigOption(testConfig),
		hsm.SetupModeOption(),
		hsm.CADirectoryOption(t.TempDir()))
	assert.NoError(t, err)

	err = acc.EnsureCAKeysAndCertificates()

	t.Cleanup(func() {
		err := acc.CloseP11Contexts()
		assert.NoError(t, err)
	})

	require.NoError(t, err)

	return acc
}

func TestGetRootCACertificate(t *testing.T) {
	acc := prepareSoftHSM(t)

	testData := map[string]struct {
		label, errMsg string
	}{
		"known root": {
			label: "root",
		},
		"unknown root": {
			label:  "unknown",
			errMsg: "could not get CA definition for label unknown",
		},
		"known intermediary": {
			label:  "sub1",
			errMsg: "CA definition sub1 is not a root CA definition",
		},
	}

	for name, item := range testData {
		t.Run(name, func(t *testing.T) {
			root, err := acc.GetRootCACertificate(item.label)

			if item.errMsg != "" {
				assert.ErrorContains(t, err, item.errMsg)
				assert.Nil(t, root)
			} else {
				assert.NoError(t, err)
				assert.NotNil(t, root)
			}
		})
	}
}

func TestGetIntermediaryCACertificate(t *testing.T) {
	acc := prepareSoftHSM(t)

	testData := map[string]struct {
		label, errMsg string
	}{
		"known intermediary": {
			label: "sub1",
		},
		"unknown intermediary": {
			label:  "unknown",
			errMsg: "could not get CA definition for label unknown",
		},
		"known root": {
			label:  "root",
			errMsg: "CA definition root is a root CA definition, intermediary expected",
		},
	}

	for name, item := range testData {
		t.Run(name, func(t *testing.T) {
			root, err := acc.GetIntermediaryCACertificate(item.label)

			if item.errMsg != "" {
				assert.ErrorContains(t, err, item.errMsg)
				assert.Nil(t, root)
			} else {
				assert.NoError(t, err)
				assert.NotNil(t, root)
			}
		})
	}
}

func TestRSAKeyGeneration(t *testing.T) {
	const testRSASignerConfig = `---
Settings:
  organization:
    organization: ["Acme CAs Ltd."]
  validity-years:
    root: 30
    intermediary: 10
  url-patterns:
    ocsp: http://ocsp.example.org/
    crl: http://crl.example.org/%s.crl
    issuer: http://%s.cas.example.org/
  serial:
    device: /dev/ttyUSB0
CAs:
  root:
    common-name: "Acme CAs root"
    key-info:
      algorithm: RSA
      rsa-bits: 2048
KeyStorage:
  default:
    type: softhsm
    label: acme-test-hsm
`

	testConfig, err := config.LoadConfiguration(strings.NewReader(testRSASignerConfig))

	require.NoError(t, err)

	setupSoftHsm(t)

	t.Setenv("TOKEN_PIN_ACME_TEST_HSM", "123456")

	acc, err := hsm.NewAccess(
		log.Default(),
		hsm.CaConfigOption(testConfig),
		hsm.SetupModeOption(),
		hsm.CADirectoryOption(t.TempDir()))
	assert.NoError(t, err)

	err = acc.EnsureCAKeysAndCertificates()
	require.NoError(t, err)

	t.Cleanup(func() {
		err := acc.CloseP11Contexts()
		assert.NoError(t, err)
	})

	root, err := acc.GetRootCACertificate("root")

	assert.NoError(t, err)
	assert.NotNil(t, root)
	assert.Equal(t, x509.RSA, root.PublicKeyAlgorithm)
}