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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 verifierWithKID struct {
tv tink.Verifier
algorithm string
customKID *string
}
func newVerifierWithKID(tv tink.Verifier, algorithm string, customKID *string) (*verifierWithKID, error) {
if tv == nil {
return nil, fmt.Errorf("tink verifier can't be nil")
}
return &verifierWithKID{
tv: tv,
algorithm: algorithm,
customKID: customKID,
}, nil
}
// VerifyAndDecodeWithKID verifies a digital signature in a compact serialized JWT.
// It then validates the token, and returns a VerifiedJWT or an error.
func (v *verifierWithKID) VerifyAndDecodeWithKID(compact string, validator *Validator, kid *string) (*VerifiedJWT, error) {
sig, content, err := splitSignedCompact(compact)
if err != nil {
return nil, errJwtVerification
}
if err := v.tv.Verify(sig, []byte(content)); err != nil {
return nil, errJwtVerification
}
rawJWT, err := decodeUnsignedTokenAndValidateHeader(content, v.algorithm, kid, v.customKID)
if err != nil {
return nil, errJwtVerification
}
if err := validator.Validate(rawJWT); err != nil {
return nil, err
}
return newVerifiedJWT(rawJWT)
}
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