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|
package sshutil
import (
"encoding/json"
"strings"
"github.com/pkg/errors"
"golang.org/x/crypto/ssh"
)
// CertType defines the certificate type, it can be a user or a host
// certificate.
type CertType uint32
const (
// UserCert defines a user certificate.
UserCert CertType = ssh.UserCert
// HostCert defines a host certificate.
HostCert CertType = ssh.HostCert
)
const (
userString = "user"
hostString = "host"
)
// CertTypeFromString returns the CertType for the string "user" and "host".
func CertTypeFromString(s string) (CertType, error) {
switch strings.ToLower(s) {
case userString:
return UserCert, nil
case hostString:
return HostCert, nil
default:
return 0, errors.Errorf("unknown certificate type '%s'", s)
}
}
// String returns "user" for user certificates and "host" for host certificates.
// It will return the empty string for any other value.
func (c CertType) String() string {
switch c {
case UserCert:
return userString
case HostCert:
return hostString
default:
return ""
}
}
// MarshalJSON implements the json.Marshaler interface for CertType. UserCert
// will be marshaled as the string "user" and HostCert as "host".
func (c CertType) MarshalJSON() ([]byte, error) {
if s := c.String(); s != "" {
return []byte(`"` + s + `"`), nil
}
return nil, errors.Errorf("unknown certificate type %d", c)
}
// UnmarshalJSON implements the json.Unmarshaler interface for CertType.
func (c *CertType) UnmarshalJSON(data []byte) error {
var s string
if err := json.Unmarshal(data, &s); err != nil {
return errors.Wrap(err, "error unmarshaling certificate type")
}
certType, err := CertTypeFromString(s)
if err != nil {
return errors.Errorf("error unmarshaling '%s' as a certificate type", s)
}
*c = certType
return nil
}
|
