/*

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 getter

import (

"bytes"

"crypto/tls"

"fmt"

"net"

"net/http"

"path"

"strings"

"sync"

"time"

"helm.sh/helm/v4/internal/tlsutil"

"helm.sh/helm/v4/internal/urlutil"

"helm.sh/helm/v4/pkg/registry"

)

// OCIGetter is the default HTTP(/S) backend handler

type OCIGetter struct {

opts getterOptions

transport *http.Transport

once sync.Once

}

// Get performs a Get from repo.Getter and returns the body.

func (g *OCIGetter) Get(href string, options ...Option) (*bytes.Buffer, error) {

for _, opt := range options {

opt(&g.opts)

}

return g.get(href)

}

func (g *OCIGetter) get(href string) (*bytes.Buffer, error) {

client := g.opts.registryClient

// if the user has already provided a configured registry client, use it,

// this is particularly true when user has his own way of handling the client credentials.

if client == nil {

c, err := g.newRegistryClient()

if err != nil {

return nil, err

}

client = c

}

ref := strings.TrimPrefix(href, registry.OCIScheme+"://")

if version := g.opts.version; version != "" && !strings.Contains(path.Base(ref), ":") {

ref = fmt.Sprintf("%s:%s", ref, version)

}

// Check if this is a plugin request

if g.opts.artifactType == "plugin" {

return g.getPlugin(client, ref)

}

// Default to chart behavior for backward compatibility

var pullOpts []registry.PullOption

requestingProv := strings.HasSuffix(ref, ".prov")

if requestingProv {

ref = strings.TrimSuffix(ref, ".prov")

pullOpts = append(pullOpts,

registry.PullOptWithChart(false),

registry.PullOptWithProv(true))

}

result, err := client.Pull(ref, pullOpts...)

if err != nil {

return nil, err

}

if requestingProv {

return bytes.NewBuffer(result.Prov.Data), nil

}

return bytes.NewBuffer(result.Chart.Data), nil

}

// NewOCIGetter constructs a valid http/https client as a Getter

func NewOCIGetter(ops ...Option) (Getter, error) {

var client OCIGetter

for _, opt := range ops {

opt(&client.opts)

}

return &client, nil

}

func (g *OCIGetter) newRegistryClient() (*registry.Client, error) {

if g.opts.transport != nil {

client, err := registry.NewClient(

registry.ClientOptHTTPClient(&http.Client{

Transport: g.opts.transport,

Timeout: g.opts.timeout,

}),

)

if err != nil {

return nil, err

}

return client, nil

}

g.once.Do(func() {

g.transport = &http.Transport{

// From https://github.com/google/go-containerregistry/blob/31786c6cbb82d6ec4fb8eb79cd9387905130534e/pkg/v1/remote/options.go#L87

DisableCompression: true,

DialContext: (&net.Dialer{

// By default we wrap the transport in retries, so reduce the

// default dial timeout to 5s to avoid 5x 30s of connection

// timeouts when doing the "ping" on certain http registries.

Timeout: 5 * time.Second,

KeepAlive: 30 * time.Second,

}).DialContext,

ForceAttemptHTTP2: true,

MaxIdleConns: 100,

IdleConnTimeout: 90 * time.Second,

TLSHandshakeTimeout: 10 * time.Second,

ExpectContinueTimeout: 1 * time.Second,

Proxy: http.ProxyFromEnvironment,

// Being nil would cause the tls.Config default to be used

// "NewTLSConfig" modifies an empty TLS config, not the default one

TLSClientConfig: &tls.Config{},

}

})

if (g.opts.certFile != "" && g.opts.keyFile != "") || g.opts.caFile != "" || g.opts.insecureSkipVerifyTLS {

tlsConf, err := tlsutil.NewTLSConfig(

tlsutil.WithInsecureSkipVerify(g.opts.insecureSkipVerifyTLS),

tlsutil.WithCertKeyPairFiles(g.opts.certFile, g.opts.keyFile),

tlsutil.WithCAFile(g.opts.caFile),

)

if err != nil {

return nil, fmt.Errorf("can't create TLS config for client: %w", err)

}

sni, err := urlutil.ExtractHostname(g.opts.url)

if err != nil {

return nil, err

}

tlsConf.ServerName = sni

g.transport.TLSClientConfig = tlsConf

}

opts := []registry.ClientOption{registry.ClientOptHTTPClient(&http.Client{

Transport: g.transport,

Timeout: g.opts.timeout,

})}

if g.opts.plainHTTP {

opts = append(opts, registry.ClientOptPlainHTTP())

}

client, err := registry.NewClient(opts...)

if err != nil {

return nil, err

}

return client, nil

}

// getPlugin handles plugin-specific OCI pulls

func (g *OCIGetter) getPlugin(client *registry.Client, ref string) (*bytes.Buffer, error) {

// Check if this is a provenance file request

requestingProv := strings.HasSuffix(ref, ".prov")

if requestingProv {

ref = strings.TrimSuffix(ref, ".prov")

}

// Extract plugin name from the reference

// e.g., "ghcr.io/user/plugin-name:v1.0.0" -> "plugin-name"

parts := strings.Split(ref, "/")

if len(parts) < 2 {

return nil, fmt.Errorf("invalid OCI reference: %s", ref)

}

lastPart := parts[len(parts)-1]

pluginName := lastPart

if idx := strings.LastIndex(lastPart, ":"); idx > 0 {

pluginName = lastPart[:idx]

}

if idx := strings.LastIndex(lastPart, "@"); idx > 0 {

pluginName = lastPart[:idx]

}

var pullOpts []registry.PluginPullOption

if requestingProv {

pullOpts = append(pullOpts, registry.PullPluginOptWithProv(true))

}

result, err := client.PullPlugin(ref, pluginName, pullOpts...)

if err != nil {

return nil, err

}

if requestingProv {

return bytes.NewBuffer(result.Prov.Data), nil

}

return bytes.NewBuffer(result.PluginData), nil

}