blob: 6e462aeda7a631736b286063fc62325b6487a22f [file] [log] [blame]
package api
import (
"encoding/json"
"encoding/pem"
"fmt"
"os"
"path/filepath"
"github.com/docker/docker/pkg/ioutils"
"github.com/docker/docker/pkg/system"
"github.com/docker/libtrust"
)
// Common constants for daemon and client.
const (
// DefaultVersion of Current REST API
DefaultVersion string = "1.32"
// NoBaseImageSpecifier is the symbol used by the FROM
// command to specify that no base image is to be used.
NoBaseImageSpecifier string = "scratch"
)
// LoadOrCreateTrustKey attempts to load the libtrust key at the given path,
// otherwise generates a new one
func LoadOrCreateTrustKey(trustKeyPath string) (libtrust.PrivateKey, error) {
err := system.MkdirAll(filepath.Dir(trustKeyPath), 0700, "")
if err != nil {
return nil, err
}
trustKey, err := libtrust.LoadKeyFile(trustKeyPath)
if err == libtrust.ErrKeyFileDoesNotExist {
trustKey, err = libtrust.GenerateECP256PrivateKey()
if err != nil {
return nil, fmt.Errorf("Error generating key: %s", err)
}
encodedKey, err := serializePrivateKey(trustKey, filepath.Ext(trustKeyPath))
if err != nil {
return nil, fmt.Errorf("Error serializing key: %s", err)
}
if err := ioutils.AtomicWriteFile(trustKeyPath, encodedKey, os.FileMode(0600)); err != nil {
return nil, fmt.Errorf("Error saving key file: %s", err)
}
} else if err != nil {
return nil, fmt.Errorf("Error loading key file %s: %s", trustKeyPath, err)
}
return trustKey, nil
}
func serializePrivateKey(key libtrust.PrivateKey, ext string) (encoded []byte, err error) {
if ext == ".json" || ext == ".jwk" {
encoded, err = json.Marshal(key)
if err != nil {
return nil, fmt.Errorf("unable to encode private key JWK: %s", err)
}
} else {
pemBlock, err := key.PEMBlock()
if err != nil {
return nil, fmt.Errorf("unable to encode private key PEM: %s", err)
}
encoded = pem.EncodeToMemory(pemBlock)
}
return
}