Use base64 strings for chart repo certs [#74]

This should be a more flexible option since certificates aren't likely
to be part of the actual workspace and may be environment-dependent. It
also mirrors the kube_certificate, which is nice.

docs/parameter_reference.md

@@ -6,7 +6,8 @@
 | mode                | string          | helm_command | Indicates the operation to perform. Recommended, but not required. Valid options are `upgrade`, `uninstall`, `lint`, and `help`. |
 | update_dependencies | boolean         |              | Calls `helm dependency update` before running the main command.|
 | add_repos           | list\<string\>  | helm_repos   | Calls `helm repo add $repo` before running the main command. Each string should be formatted as `repo_name=https://repo.url/`. |
-| repo_ca_file        | string          |              | TLS certificate for a chart repository certificate authority. |
+| repo_certificate    | string          |              | Base64 encoded TLS certificate for a chart repository. |
+| repo_ca_certificate | string          |              | Base64 encoded TLS certificate for a chart repository certificate authority. |
 | namespace           | string          |              | Kubernetes namespace to use for this operation. |
 | debug               | boolean         |              | Generate debug output within drone-helm3 and pass `--debug` to all helm commands. Use with care, since the debug output may include secrets. |
 

internal/env/config.go

@@ -24,7 +24,8 @@ type Config struct {
 	DroneEvent         string   `envconfig:"drone_build_event"`      // Drone event that invoked this plugin.
 	UpdateDependencies bool     `split_words:"true"`                 // Call `helm dependency update` before the main command
 	AddRepos           []string `split_words:"true"`                 // Call `helm repo add` before the main command
-	RepoCAFile         string   `envconfig:"repo_ca_file"`           // CA certificate for `helm repo add`
+	RepoCertificate    string   `envconfig:"repo_certificate"`       // The Helm chart repository's self-signed certificate (must be base64-encoded)
+	RepoCACertificate  string   `envconfig:"repo_ca_certificate"`    // The Helm chart repository CA's self-signed certificate (must be base64-encoded)
 	Debug              bool     ``                                   // Generate debug output and pass --debug to all helm commands
 	Values             string   ``                                   // Argument to pass to --set in applicable helm commands
 	StringValues       string   `split_words:"true"`                 // Argument to pass to --set-string in applicable helm commands

internal/run/addrepo.go

@@ -9,9 +9,9 @@ import (
 // AddRepo is an execution step that calls `helm repo add` when executed.
 type AddRepo struct {
 	*config
-	repo   string
-	caFile string
-	cmd    cmd
+	repo  string
+	certs *repoCerts
+	cmd   cmd
 }
 
 // NewAddRepo creates an AddRepo for the given repo-spec. No validation is performed at this time.
@@ -19,7 +19,7 @@ func NewAddRepo(cfg env.Config, repo string) *AddRepo {
 	return &AddRepo{
 		config: newConfig(cfg),
 		repo:   repo,
-		caFile: cfg.RepoCAFile,
+		certs:  newRepoCerts(cfg),
 	}
 }
 
@@ -38,14 +38,16 @@ func (a *AddRepo) Prepare() error {
 		return fmt.Errorf("bad repo spec '%s'", a.repo)
 	}
 
+	if err := a.certs.write(); err != nil {
+		return err
+	}
+
 	name := split[0]
 	url := split[1]
 
 	args := a.globalFlags()
 	args = append(args, "repo", "add")
-	if a.caFile != "" {
-		args = append(args, "--ca-file", a.caFile)
-	}
+	args = append(args, a.certs.flags()...)
 	args = append(args, name, url)
 
 	a.cmd = command(helmBin, args...)

internal/run/addrepo_test.go

@@ -43,6 +43,7 @@ func (suite *AddRepoTestSuite) TestNewAddRepo() {
 	suite.Require().NotNil(repo)
 	suite.Equal("picompress=https://github.com/caleb_phipps/picompress", repo.repo)
 	suite.NotNil(repo.config)
+	suite.NotNil(repo.certs)
 }
 
 func (suite *AddRepoTestSuite) TestPrepareAndExecute() {
@@ -100,10 +101,11 @@ func (suite *AddRepoTestSuite) TestPrepareWithEqualSignInURL() {
 func (suite *AddRepoTestSuite) TestRepoAddFlags() {
 	suite.mockCmd.EXPECT().Stdout(gomock.Any()).AnyTimes()
 	suite.mockCmd.EXPECT().Stderr(gomock.Any()).AnyTimes()
-	cfg := env.Config{
-		RepoCAFile: "./helm/reporepo.cert",
-	}
+	cfg := env.Config{}
 	a := NewAddRepo(cfg, "machine=https://github.com/harold_finch/themachine")
+
+	// inject a ca cert filename so repoCerts won't create any files that we'd have to clean up
+	a.certs.caCertFilename = "./helm/reporepo.cert"
 	suite.NoError(a.Prepare())
 	suite.Equal([]string{"repo", "add", "--ca-file", "./helm/reporepo.cert",
 		"machine", "https://github.com/harold_finch/themachine"}, suite.commandArgs)

internal/run/repocerts.go

@@ -0,0 +1,77 @@
+package run
+
+import (
+	"encoding/base64"
+	"fmt"
+	"github.com/pelotech/drone-helm3/internal/env"
+	"io/ioutil"
+)
+
+type repoCerts struct {
+	*config
+	cert           string
+	certFilename   string
+	caCert         string
+	caCertFilename string
+}
+
+func newRepoCerts(cfg env.Config) *repoCerts {
+	return &repoCerts{
+		config: newConfig(cfg),
+		cert:   cfg.RepoCertificate,
+		caCert: cfg.RepoCACertificate,
+	}
+}
+
+func (rc *repoCerts) write() error {
+	if rc.cert != "" {
+		file, err := ioutil.TempFile("", "repo********.cert")
+		defer file.Close()
+		if err != nil {
+			return fmt.Errorf("failed to create certificate file: %w", err)
+		}
+		rc.certFilename = file.Name()
+		rawCert, err := base64.StdEncoding.DecodeString(rc.cert)
+		if err != nil {
+			return fmt.Errorf("failed to base64-decode certificate string: %w", err)
+		}
+		if rc.debug {
+			fmt.Fprintf(rc.stderr, "writing repo certificate to %s\n", rc.certFilename)
+		}
+		if _, err := file.Write(rawCert); err != nil {
+			return fmt.Errorf("failed to write certificate file: %w", err)
+		}
+	}
+
+	if rc.caCert != "" {
+		file, err := ioutil.TempFile("", "repo********.ca.cert")
+		defer file.Close()
+		if err != nil {
+			return fmt.Errorf("failed to create CA certificate file: %w", err)
+		}
+		rc.caCertFilename = file.Name()
+		rawCert, err := base64.StdEncoding.DecodeString(rc.caCert)
+		if err != nil {
+			return fmt.Errorf("failed to base64-decode CA certificate string: %w", err)
+		}
+		if rc.debug {
+			fmt.Fprintf(rc.stderr, "writing repo ca certificate to %s\n", rc.caCertFilename)
+		}
+		if _, err := file.Write(rawCert); err != nil {
+			return fmt.Errorf("failed to write CA certificate file: %w", err)
+		}
+	}
+	return nil
+}
+
+func (rc *repoCerts) flags() []string {
+	flags := make([]string, 0)
+	if rc.certFilename != "" {
+		flags = append(flags, "--cert-file", rc.certFilename)
+	}
+	if rc.caCertFilename != "" {
+		flags = append(flags, "--ca-file", rc.caCertFilename)
+	}
+
+	return flags
+}

internal/run/repocerts_test.go

@@ -0,0 +1,80 @@
+package run
+
+import (
+	"fmt"
+	"github.com/pelotech/drone-helm3/internal/env"
+	"github.com/stretchr/testify/suite"
+	"io/ioutil"
+	"os"
+	"strings"
+	"testing"
+)
+
+type RepoCertsTestSuite struct {
+	suite.Suite
+}
+
+func TestRepoCertsTestSuite(t *testing.T) {
+	suite.Run(t, new(RepoCertsTestSuite))
+}
+
+func (suite *RepoCertsTestSuite) TestNewRepoCerts() {
+	cfg := env.Config{
+		RepoCertificate:   "bGljZW5zZWQgYnkgdGhlIFN0YXRlIG9mIE9yZWdvbiB0byBwZXJmb3JtIHJlcG9zc2Vzc2lvbnM=",
+		RepoCACertificate: "T3JlZ29uIFN0YXRlIExpY2Vuc3VyZSBib2FyZA==",
+	}
+	rc := newRepoCerts(cfg)
+	suite.Require().NotNil(rc)
+	suite.Equal("bGljZW5zZWQgYnkgdGhlIFN0YXRlIG9mIE9yZWdvbiB0byBwZXJmb3JtIHJlcG9zc2Vzc2lvbnM=", rc.cert)
+	suite.Equal("T3JlZ29uIFN0YXRlIExpY2Vuc3VyZSBib2FyZA==", rc.caCert)
+}
+
+func (suite *RepoCertsTestSuite) TestWrite() {
+	cfg := env.Config{
+		RepoCertificate:   "bGljZW5zZWQgYnkgdGhlIFN0YXRlIG9mIE9yZWdvbiB0byBwZXJmb3JtIHJlcG9zc2Vzc2lvbnM=",
+		RepoCACertificate: "T3JlZ29uIFN0YXRlIExpY2Vuc3VyZSBib2FyZA==",
+	}
+	rc := newRepoCerts(cfg)
+	suite.Require().NotNil(rc)
+
+	suite.NoError(rc.write())
+	defer os.Remove(rc.certFilename)
+	defer os.Remove(rc.caCertFilename)
+	suite.NotEqual("", rc.certFilename)
+	suite.NotEqual("", rc.caCertFilename)
+
+	cert, err := ioutil.ReadFile(rc.certFilename)
+	suite.Require().NoError(err)
+	caCert, err := ioutil.ReadFile(rc.caCertFilename)
+	suite.Require().NoError(err)
+	suite.Equal("licensed by the State of Oregon to perform repossessions", string(cert))
+	suite.Equal("Oregon State Licensure board", string(caCert))
+}
+
+func (suite *RepoCertsTestSuite) TestFlags() {
+	rc := newRepoCerts(env.Config{})
+	suite.Equal([]string{}, rc.flags())
+	rc.certFilename = "hurgityburgity"
+	suite.Equal([]string{"--cert-file", "hurgityburgity"}, rc.flags())
+	rc.caCertFilename = "honglydongly"
+	suite.Equal([]string{"--cert-file", "hurgityburgity", "--ca-file", "honglydongly"}, rc.flags())
+}
+
+func (suite *RepoCertsTestSuite) TestDebug() {
+	stderr := strings.Builder{}
+	cfg := env.Config{
+		RepoCertificate:   "bGljZW5zZWQgYnkgdGhlIFN0YXRlIG9mIE9yZWdvbiB0byBwZXJmb3JtIHJlcG9zc2Vzc2lvbnM=",
+		RepoCACertificate: "T3JlZ29uIFN0YXRlIExpY2Vuc3VyZSBib2FyZA==",
+		Stderr:            &stderr,
+		Debug:             true,
+	}
+	rc := newRepoCerts(cfg)
+	suite.Require().NotNil(rc)
+
+	suite.NoError(rc.write())
+	defer os.Remove(rc.certFilename)
+	defer os.Remove(rc.caCertFilename)
+
+	suite.Contains(stderr.String(), fmt.Sprintf("writing repo certificate to %s", rc.certFilename))
+	suite.Contains(stderr.String(), fmt.Sprintf("writing repo ca certificate to %s", rc.caCertFilename))
+}

internal/run/upgrade.go

@@ -22,7 +22,7 @@ type Upgrade struct {
 	force         bool
 	atomic        bool
 	cleanupOnFail bool
-	caFile        string
+	certs         *repoCerts
 
 	cmd cmd
 }
@@ -44,7 +44,7 @@ func NewUpgrade(cfg env.Config) *Upgrade {
 		force:         cfg.Force,
 		atomic:        cfg.AtomicUpgrade,
 		cleanupOnFail: cfg.CleanupOnFail,
-		caFile:        cfg.RepoCAFile,
+		certs:         newRepoCerts(cfg),
 	}
 }
 
@@ -98,9 +98,7 @@ func (u *Upgrade) Prepare() error {
 	for _, vFile := range u.valuesFiles {
 		args = append(args, "--values", vFile)
 	}
-	if u.caFile != "" {
-		args = append(args, "--ca-file", u.caFile)
-	}
+	args = append(args, u.certs.flags()...)
 
 	args = append(args, u.release, u.chart)
 	u.cmd = command(helmBin, args...)

internal/run/upgrade_test.go

@@ -64,6 +64,7 @@ func (suite *UpgradeTestSuite) TestNewUpgrade() {
 	suite.Equal(true, up.atomic)
 	suite.Equal(true, up.cleanupOnFail)
 	suite.NotNil(up.config)
+	suite.NotNil(up.certs)
 }
 
 func (suite *UpgradeTestSuite) TestPrepareAndExecute() {
@@ -136,9 +137,10 @@ func (suite *UpgradeTestSuite) TestPrepareWithUpgradeFlags() {
 		Force:         true,
 		AtomicUpgrade: true,
 		CleanupOnFail: true,
-		RepoCAFile:    "local_ca.cert",
 	}
 	u := NewUpgrade(cfg)
+	// inject a ca cert filename so repoCerts won't create any files that we'd have to clean up
+	u.certs.caCertFilename = "local_ca.cert"
 
 	command = func(path string, args ...string) cmd {
 		suite.Equal(helmBin, path)