/*
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 (
	"fmt"
	"log"
	"os"
	"os/exec"
	"path"
	"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 TestCaConfigOption(t *testing.T) {
	testSignerConfig := config.SignerConfig{}

	access, err := hsm.NewAccess(log.Default(), hsm.CaConfigOption(&testSignerConfig))
	assert.NoError(t, err)

	assert.Equal(t, &testSignerConfig, access.GetSignerConfig())
}

func TestGetSignerConfig_empty(t *testing.T) {
	access, err := hsm.NewAccess(log.Default())
	assert.NoError(t, err)

	assert.Nil(t, access.GetSignerConfig())
}

func TestSetupModeOption(t *testing.T) {
	access, err := hsm.NewAccess(log.Default(), hsm.SetupModeOption())
	assert.NoError(t, err)

	assert.True(t, access.IsSetupMode())
}

func TestIsSetupMode_not_set(t *testing.T) {
	access, err := hsm.NewAccess(log.Default())
	assert.NoError(t, err)

	assert.False(t, access.IsSetupMode())
}

func TestVerboseLoggingOption(t *testing.T) {
	access, err := hsm.NewAccess(log.Default(), hsm.VerboseLoggingOption())
	assert.NoError(t, err)

	assert.True(t, access.IsVerbose())
}

func TestIsVerbose_not_set(t *testing.T) {
	access, err := hsm.NewAccess(log.Default())
	assert.NoError(t, err)

	assert.False(t, access.IsVerbose())
}

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

	access, err := hsm.NewAccess(
		log.Default(),
		hsm.SetupModeOption(),
		hsm.VerboseLoggingOption(),
		hsm.CaConfigOption(testConfig),
	)
	assert.NoError(t, err)

	assert.True(t, access.IsSetupMode())
	assert.True(t, access.IsVerbose())
	assert.Equal(t, access.GetSignerConfig(), testConfig)
}

func TestGetP11Context_unknown_storage(t *testing.T) {
	testConfig := setupSignerConfig(t)

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

	definition := &config.CaCertificateEntry{Storage: "undefined"}

	p11Context, err := access.GetP11Context(definition)

	assert.Error(t, err)
	assert.ErrorContains(t, err, "key storage undefined not available")
	assert.Nil(t, p11Context)
}

func TestGetP11Context_wrong_pin(t *testing.T) {
	testConfig := setupSignerConfig(t)
	setupSoftHsm(t)

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

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

	definition, err := testConfig.GetCADefinition("root")

	require.NoError(t, err)

	_, err = access.GetP11Context(definition)

	assert.ErrorContains(t, err, "could not configure PKCS#11 library")
}

func TestGetP11Context_no_pin(t *testing.T) {
	testConfig := setupSignerConfig(t)
	setupSoftHsm(t)

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

	definition, err := testConfig.GetCADefinition("root")

	require.NoError(t, err)

	_, err = access.GetP11Context(definition)

	assert.ErrorContains(t, err, "stdin is not a terminal")
}

func TestGetP11Context(t *testing.T) {
	testConfig := setupSignerConfig(t)
	setupSoftHsm(t)

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

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

	definition, err := testConfig.GetCADefinition("root")

	require.NoError(t, err)

	p11Context1, err := access.GetP11Context(definition)
	assert.NoError(t, err)

	assert.NotNil(t, p11Context1)

	p11Context2, err := access.GetP11Context(definition)
	assert.NoError(t, err)

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

	assert.NotNil(t, p11Context1)
	assert.Equal(t, p11Context1, p11Context2)
}

const testSignerConfig = `---
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: EC
      ecc-curve: secp521r1
  sub1:
    common-name: "Acme CAs server sub CA"
    parent: root
    key-info:
      algorithm: EC
      ecc-curve: secp256r1
  sub2:
    common-name: "Acme CAs people sub CA"
    parent: root
    key-info:
      algorithm: EC
      ecc-curve: secp256r1
KeyStorage:
  default:
    type: softhsm
    label: acme-test-hsm
`

func setupSignerConfig(t *testing.T) *config.SignerConfig {
	t.Helper()

	conf, err := config.LoadConfiguration(strings.NewReader(testSignerConfig))

	require.NoError(t, err)

	return conf
}

func setupSoftHsm(t *testing.T) {
	t.Helper()

	tempDir := t.TempDir()

	tokenDir := path.Join(tempDir, "tokens")
	softhsmConfig := path.Join(tempDir, "softhsm2.conf")

	err := os.Mkdir(tokenDir, 0o700)

	require.NoError(t, err)

	err = os.WriteFile(softhsmConfig, []byte(fmt.Sprintf("directories.tokendir = %s", tokenDir)), 0o600)

	require.NoError(t, err)

	t.Setenv("SOFTHSM2_CONF", softhsmConfig)

	err = exec.Command(
		"softhsm2-util",
		"--init-token",
		"--free",
		"--label",
		"acme-test-hsm",
		"--so-pin",
		"12345678",
		"--pin",
		"123456",
	).Run()

	require.NoError(t, err)
}