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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 mocks
import (
"crypto"
"crypto/ecdsa"
"crypto/rsa"
"encoding/json"
"fmt"
"time"
"github.com/lestrrat-go/jwx/v2/jwa"
"github.com/lestrrat-go/jwx/v2/jws"
"github.com/openpubkey/openpubkey/oidc"
)
type CommitmentType struct {
ClaimCommitment bool
ClaimName string
}
type IDTokenTemplate struct {
CommitFunc func(*IDTokenTemplate, string)
Issuer string
Nonce string
NoNonce bool
Aud string
KeyID string
NoKeyID bool
Alg string
NoAlg bool // Even if NOAlg is true, we still need Alg to be set to generate the signature
ExtraClaims map[string]any
ExtraProtectedClaims map[string]any
SigningKey crypto.Signer // The key we will use to sign the ID Token
}
func DefaultIDTokenTemplate() IDTokenTemplate {
return IDTokenTemplate{
CommitFunc: AddAudCommit,
Issuer: "mockIssuer",
Nonce: "empty",
NoNonce: false,
Aud: "empty",
KeyID: "mockKeyID",
NoKeyID: false,
Alg: "RS256",
NoAlg: false,
}
}
// AddCommit adds the commitment to the CIC to the ID Token. The
// CommitmentFunc is specified allowing custom commitment functions to be specified
func (t *IDTokenTemplate) AddCommit(cicHash string) {
t.CommitFunc(t, cicHash)
}
func (t *IDTokenTemplate) IssueTokens() (*oidc.Tokens, error) {
headers := jws.NewHeaders()
if !t.NoAlg {
if err := headers.Set(jws.AlgorithmKey, t.Alg); err != nil {
return nil, err
}
}
if !t.NoKeyID {
if err := headers.Set(jws.KeyIDKey, t.KeyID); err != nil {
return nil, err
}
}
if err := headers.Set(jws.TypeKey, "JWT"); err != nil {
return nil, err
}
if t.ExtraProtectedClaims != nil {
for k, v := range t.ExtraProtectedClaims {
if err := headers.Set(k, v); err != nil {
return nil, err
}
}
}
payloadMap := map[string]any{
"sub": "me",
"aud": t.Aud,
"iss": t.Issuer,
"iat": time.Now().Unix(),
"exp": time.Now().Add(2 * time.Hour).Unix(),
}
if !t.NoNonce {
payloadMap["nonce"] = t.Nonce
}
if t.ExtraClaims != nil {
for k, v := range t.ExtraClaims {
payloadMap[k] = v
}
}
payloadBytes, err := json.Marshal(payloadMap)
if err != nil {
return nil, err
}
var providerAlg jwa.KeyAlgorithm
if _, ok := t.SigningKey.Public().(*rsa.PublicKey); ok {
providerAlg = jwa.RS256
} else if _, ok := t.SigningKey.Public().(*ecdsa.PublicKey); ok {
providerAlg = jwa.ES256
} else {
return nil, fmt.Errorf("unsupported public key type")
}
if jwa.KeyAlgorithmFrom(t.Alg) != providerAlg {
return nil, fmt.Errorf("alg in template (%s) does not match providers signing key alg (%s)", t.Alg, providerAlg)
}
idToken, err := jws.Sign(
payloadBytes,
jws.WithKey(
providerAlg,
t.SigningKey,
jws.WithProtectedHeaders(headers),
),
)
if err != nil {
return nil, err
}
return &oidc.Tokens{
IDToken: idToken,
RefreshToken: []byte("mock-refresh-token"),
AccessToken: []byte("mock-access-token")}, nil
}
func AddNonceCommit(idtTemp *IDTokenTemplate, cicHash string) {
idtTemp.Nonce = cicHash
idtTemp.NoNonce = false
}
func AddAudCommit(idtTemp *IDTokenTemplate, cicHash string) {
idtTemp.Aud = cicHash
}
func NoClaimCommit(idtTemp *IDTokenTemplate, cicHash string) {
// Do nothing
}
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