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// Copyright 2022 Google LLC
//
// 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 jwt
import (
"fmt"
"github.com/tink-crypto/tink-go/v2/tink"
)
type signerWithKID struct {
ts tink.Signer
algorithm string
customKID *string
}
func newSignerWithKID(ts tink.Signer, algorithm string, customKID *string) (*signerWithKID, error) {
if ts == nil {
return nil, fmt.Errorf("tink signer can't be nil")
}
return &signerWithKID{
ts: ts,
algorithm: algorithm,
customKID: customKID,
}, nil
}
// SignAndEncodeWithKID creates the header and content from a rawJWT and combines them into a unsigned token.
// It then signs it and encodes the output using compact serialization.
func (s *signerWithKID) SignAndEncodeWithKID(rawJWT *RawJWT, kid *string) (string, error) {
unsigned, err := createUnsigned(rawJWT, s.algorithm, kid, s.customKID)
if err != nil {
return "", err
}
signature, err := s.ts.Sign([]byte(unsigned))
if err != nil {
return "", err
}
return combineUnsignedAndSignature(unsigned, signature), nil
}
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