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// Copyright 2024 OpenPubkey
//
// 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.
//
// SPDX-License-Identifier: Apache-2.0
package pktoken
import (
"encoding/json"
"fmt"
)
type CosignerClaims struct {
Issuer string `json:"iss"`
KeyID string `json:"kid"`
Algorithm string `json:"alg"`
AuthID string `json:"eid"`
AuthTime int64 `json:"auth_time"`
IssuedAt int64 `json:"iat"` // may differ from auth_time because of refresh
Expiration int64 `json:"exp"`
RedirectURI string `json:"ruri"`
Nonce string `json:"nonce"`
Typ string `json:"typ"`
}
func (p *PKToken) ParseCosignerClaims() (*CosignerClaims, error) {
protected, err := json.Marshal(p.Cos.ProtectedHeaders())
if err != nil {
return nil, err
}
var claims CosignerClaims
if err := json.Unmarshal(protected, &claims); err != nil {
return nil, err
}
// Check that all fields are present
var missing []string
if claims.Issuer == "" {
missing = append(missing, `iss`)
}
if claims.KeyID == "" {
missing = append(missing, `kid`)
}
if claims.Algorithm == "" {
missing = append(missing, `alg`)
}
if claims.AuthID == "" {
missing = append(missing, `eid`)
}
if claims.AuthTime == 0 {
missing = append(missing, `auth_time`)
}
if claims.IssuedAt == 0 {
missing = append(missing, `iat`)
}
if claims.Expiration == 0 {
missing = append(missing, `exp`)
}
if claims.RedirectURI == "" {
missing = append(missing, `ruri`)
}
if claims.Nonce == "" {
missing = append(missing, `nonce`)
}
if len(missing) > 0 {
return nil, fmt.Errorf("cosigner protect header missing required headers: %v", missing)
}
return &claims, nil
}
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