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|
package kms
import (
"context"
"fmt"
"io/fs"
"go.step.sm/crypto/kms/apiv1"
)
// FS adds a close method to the fs.FS interface. This new method allows to
// properly close the underlying KMS.
type FS interface {
fs.FS
Close() error
}
type kmsfs struct {
apiv1.KeyManager
}
func newFS(ctx context.Context, kmsuri string) (*kmsfs, error) {
if kmsuri == "" {
return &kmsfs{}, nil
}
km, err := loadKMS(ctx, kmsuri)
if err != nil {
return nil, err
}
return &kmsfs{KeyManager: km}, nil
}
func (f *kmsfs) Close() error {
if f != nil && f.KeyManager != nil {
return f.KeyManager.Close()
}
return nil
}
func (f *kmsfs) getKMS(kmsuri string) (apiv1.KeyManager, error) {
if f.KeyManager == nil {
return loadKMS(context.TODO(), kmsuri)
}
return f.KeyManager, nil
}
func loadKMS(ctx context.Context, kmsuri string) (apiv1.KeyManager, error) {
return New(ctx, apiv1.Options{
URI: kmsuri,
})
}
func openError(name string, err error) *fs.PathError {
return &fs.PathError{
Path: name,
Op: "open",
Err: err,
}
}
// certFS implements an io/fs to load certificates from a KMS.
type certFS struct {
*kmsfs
}
// CertFS creates a new io/fs with the given KMS URI.
func CertFS(ctx context.Context, kmsuri string) (FS, error) {
km, err := newFS(ctx, kmsuri)
if err != nil {
return nil, err
}
_, ok := km.KeyManager.(apiv1.CertificateManager)
if !ok {
return nil, fmt.Errorf("%s does not implement a CertificateManager", kmsuri)
}
return &certFS{kmsfs: km}, nil
}
// Open returns a file representing a certificate in an KMS.
func (f *certFS) Open(name string) (fs.File, error) {
km, err := f.getKMS(name)
if err != nil {
return nil, openError(name, err)
}
cert, err := km.(apiv1.CertificateManager).LoadCertificate(&apiv1.LoadCertificateRequest{
Name: name,
})
if err != nil {
return nil, openError(name, err)
}
return &object{
Path: name,
Object: cert,
}, nil
}
// keyFS implements an io/fs to load public keys from a KMS.
type keyFS struct {
*kmsfs
}
// KeyFS creates a new KeyFS with the given KMS URI.
func KeyFS(ctx context.Context, kmsuri string) (FS, error) {
km, err := newFS(ctx, kmsuri)
if err != nil {
return nil, err
}
return &keyFS{kmsfs: km}, nil
}
// Open returns a file representing a public key in a KMS.
func (f *keyFS) Open(name string) (fs.File, error) {
km, err := f.getKMS(name)
if err != nil {
return nil, openError(name, err)
}
// Attempt with a public key
pub, err := km.GetPublicKey(&apiv1.GetPublicKeyRequest{
Name: name,
})
if err != nil {
return nil, openError(name, err)
}
return &object{
Path: name,
Object: pub,
}, nil
}
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