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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 (
"context"
"crypto"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/rsa"
"encoding/json"
"fmt"
mathrand "math/rand"
"github.com/lestrrat-go/jwx/v2/jwk"
"github.com/openpubkey/openpubkey/discover"
"github.com/openpubkey/openpubkey/oidc"
"golang.org/x/exp/maps"
)
type MockProviderBackend struct {
Issuer string
PublicKeyFinder discover.PublicKeyFinder
ProviderSigningKeySet map[string]crypto.Signer // kid (keyId) -> signing key
ProviderPublicKeySet map[string]discover.PublicKeyRecord // kid (keyId) -> PublicKeyRecord
IDTokensTemplate *IDTokenTemplate
}
func NewMockProviderBackend(issuer string, alg string, numKeys int) (*MockProviderBackend, error) {
var providerSigningKeySet map[string]crypto.Signer
var providerPublicKeySet map[string]discover.PublicKeyRecord
var err error
if alg == "RS256" {
if providerSigningKeySet, providerPublicKeySet, err = CreateRS256KeySet(issuer, numKeys); err != nil {
return nil, err
}
} else if alg == "ES256" {
if providerSigningKeySet, providerPublicKeySet, err = CreateES256KeySet(issuer, numKeys); err != nil {
return nil, err
}
} else {
return nil, fmt.Errorf("unsupported provider alg: %s", alg)
}
return &MockProviderBackend{
Issuer: issuer,
PublicKeyFinder: discover.PublicKeyFinder{
JwksFunc: func(ctx context.Context, issuer string) ([]byte, error) {
keySet := jwk.NewSet()
for kid, record := range providerPublicKeySet {
jwkKey, err := jwk.PublicKeyOf(record.PublicKey)
if err != nil {
return nil, err
}
if err := jwkKey.Set(jwk.AlgorithmKey, record.Alg); err != nil {
return nil, err
}
if err := jwkKey.Set(jwk.KeyIDKey, kid); err != nil {
return nil, err
}
// Put our jwk into a set
if err := keySet.AddKey(jwkKey); err != nil {
return nil, err
}
}
return json.MarshalIndent(keySet, "", " ")
},
},
ProviderSigningKeySet: providerSigningKeySet,
ProviderPublicKeySet: providerPublicKeySet,
}, nil
}
func (o *MockProviderBackend) GetPublicKeyFinder() *discover.PublicKeyFinder {
return &o.PublicKeyFinder
}
func (o *MockProviderBackend) GetProviderPublicKeySet() map[string]discover.PublicKeyRecord {
return o.ProviderPublicKeySet
}
func (o *MockProviderBackend) GetProviderSigningKeySet() map[string]crypto.Signer {
return o.ProviderSigningKeySet
}
func (o *MockProviderBackend) SetIDTokenTemplate(template *IDTokenTemplate) {
o.IDTokensTemplate = template
}
func (o *MockProviderBackend) RequestTokensOverrideFunc(cicHash string) (*oidc.Tokens, error) {
o.IDTokensTemplate.AddCommit(cicHash)
return o.IDTokensTemplate.IssueTokens()
}
func (o *MockProviderBackend) RandomSigningKey() (crypto.Signer, string, discover.PublicKeyRecord) {
keyIDs := maps.Keys(o.GetProviderPublicKeySet())
keyID := keyIDs[mathrand.Intn(len(keyIDs))]
return o.GetProviderSigningKeySet()[keyID], keyID, o.GetProviderPublicKeySet()[keyID]
}
func CreateRS256KeySet(issuer string, numKeys int) (map[string]crypto.Signer, map[string]discover.PublicKeyRecord, error) {
return CreateKeySet(issuer, "RS256", numKeys)
}
func CreateES256KeySet(issuer string, numKeys int) (map[string]crypto.Signer, map[string]discover.PublicKeyRecord, error) {
return CreateKeySet(issuer, "ES256", numKeys)
}
func CreateKeySet(issuer string, alg string, numKeys int) (map[string]crypto.Signer, map[string]discover.PublicKeyRecord, error) {
providerSigningKeySet := map[string]crypto.Signer{}
providerPublicKeySet := map[string]discover.PublicKeyRecord{}
for i := 0; i < numKeys; i++ {
kid := fmt.Sprintf("kid-%d", i)
var signingKey crypto.Signer
var err error
switch alg {
case "ES256":
if signingKey, err = ecdsa.GenerateKey(elliptic.P256(), rand.Reader); err != nil {
return nil, nil, err
}
case "RS256":
if signingKey, err = rsa.GenerateKey(rand.Reader, 2048); err != nil {
return nil, nil, err
}
default:
return nil, nil, fmt.Errorf("unsupported alg: %s", alg)
}
providerSigningKeySet[string(kid)] = signingKey
providerPublicKeySet[string(kid)] = discover.PublicKeyRecord{
PublicKey: signingKey.Public(),
Alg: alg,
Issuer: issuer,
}
}
return providerSigningKeySet, providerPublicKeySet, nil
}
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