working commit

vendor/helm.sh/helm/v4/internal/tlsutil/tls.go

@@ -0,0 +1,122 @@
+/*
+Copyright The Helm 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 tlsutil
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"fmt"
+	"os"
+
+	"errors"
+)
+
+type TLSConfigOptions struct {
+	insecureSkipTLSVerify     bool
+	certPEMBlock, keyPEMBlock []byte
+	caPEMBlock                []byte
+}
+
+type TLSConfigOption func(options *TLSConfigOptions) error
+
+func WithInsecureSkipVerify(insecureSkipTLSVerify bool) TLSConfigOption {
+	return func(options *TLSConfigOptions) error {
+		options.insecureSkipTLSVerify = insecureSkipTLSVerify
+
+		return nil
+	}
+}
+
+func WithCertKeyPairFiles(certFile, keyFile string) TLSConfigOption {
+	return func(options *TLSConfigOptions) error {
+		if certFile == "" && keyFile == "" {
+			return nil
+		}
+
+		certPEMBlock, err := os.ReadFile(certFile)
+		if err != nil {
+			return fmt.Errorf("unable to read cert file: %q: %w", certFile, err)
+		}
+
+		keyPEMBlock, err := os.ReadFile(keyFile)
+		if err != nil {
+			return fmt.Errorf("unable to read key file: %q: %w", keyFile, err)
+		}
+
+		options.certPEMBlock = certPEMBlock
+		options.keyPEMBlock = keyPEMBlock
+
+		return nil
+	}
+}
+
+func WithCAFile(caFile string) TLSConfigOption {
+	return func(options *TLSConfigOptions) error {
+		if caFile == "" {
+			return nil
+		}
+
+		caPEMBlock, err := os.ReadFile(caFile)
+		if err != nil {
+			return fmt.Errorf("can't read CA file: %q: %w", caFile, err)
+		}
+
+		options.caPEMBlock = caPEMBlock
+
+		return nil
+	}
+}
+
+func NewTLSConfig(options ...TLSConfigOption) (*tls.Config, error) {
+	to := TLSConfigOptions{}
+
+	errs := []error{}
+	for _, option := range options {
+		err := option(&to)
+		if err != nil {
+			errs = append(errs, err)
+		}
+	}
+
+	if len(errs) > 0 {
+		return nil, errors.Join(errs...)
+	}
+
+	config := tls.Config{
+		InsecureSkipVerify: to.insecureSkipTLSVerify,
+	}
+
+	if len(to.certPEMBlock) > 0 && len(to.keyPEMBlock) > 0 {
+		cert, err := tls.X509KeyPair(to.certPEMBlock, to.keyPEMBlock)
+		if err != nil {
+			return nil, fmt.Errorf("unable to load cert from key pair: %w", err)
+		}
+
+		config.Certificates = []tls.Certificate{cert}
+	}
+
+	if len(to.caPEMBlock) > 0 {
+		cp := x509.NewCertPool()
+		if !cp.AppendCertsFromPEM(to.caPEMBlock) {
+			return nil, fmt.Errorf("failed to append certificates from pem block")
+		}
+
+		config.RootCAs = cp
+	}
+
+	return &config, nil
+}