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signer_default.go
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signer_default.go
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// Copyright © 2023 Ory Corp
// SPDX-License-Identifier: Apache-2.0
package credentials
import (
"context"
"crypto/ecdsa"
"crypto/rsa"
"net/url"
"reflect"
"github.com/go-jose/go-jose/v3"
"github.com/golang-jwt/jwt/v4"
"github.com/pkg/errors"
"golang.org/x/crypto/ed25519"
)
var _ Signer = new(DefaultSigner)
type DefaultSigner struct {
r FetcherRegistry
}
func NewSignerDefault(r FetcherRegistry) *DefaultSigner {
return &DefaultSigner{r: r}
}
func (s *DefaultSigner) Sign(ctx context.Context, location *url.URL, claims jwt.Claims) (string, error) {
key, id, err := s.key(ctx, location)
if err != nil {
return "", err
}
method := jwt.GetSigningMethod(key.Algorithm)
if method == nil {
return "", errors.Errorf(`credentials: signing key "%s" declares unsupported algorithm "%s"`, key.KeyID, key.Algorithm)
}
token := jwt.NewWithClaims(method, claims)
token.Header["kid"] = id
signed, err := token.SignedString(key.Key)
if err != nil {
return "", errors.WithStack(err)
}
return signed, nil
}
func (s *DefaultSigner) key(ctx context.Context, location *url.URL) (*jose.JSONWebKey, string, error) {
keys, err := s.r.CredentialsFetcher().ResolveSets(ctx, []url.URL{*location})
if err != nil {
return nil, "", err
}
if len(keys) == 0 {
return nil, "", errors.Errorf("credentials: expected at least one JSON Web Key Set to be returned but got: %d", len(keys))
}
var pk jose.JSONWebKey
var kid string
for _, key := range keys[0].Keys {
switch key.Key.(type) {
case ed25519.PrivateKey:
pk = key
case ed25519.PublicKey:
kid = key.KeyID
case *ecdsa.PrivateKey:
pk = key
case *ecdsa.PublicKey:
kid = key.KeyID
case *rsa.PrivateKey:
pk = key
case *rsa.PublicKey:
kid = key.KeyID
case []byte:
pk = key
kid = key.KeyID
default:
return nil, "", errors.Errorf("credentials: unknown key type '%s'", reflect.TypeOf(key))
}
if pk.Key != nil && kid != "" {
break
}
}
if pk.KeyID == "" {
return nil, "", errors.Errorf("credentials: no suitable key could be found")
}
if kid == "" {
kid = pk.KeyID
}
return &pk, kid, nil
}