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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 gitlab_example
import (
"context"
"encoding/base64"
"fmt"
"github.com/openpubkey/openpubkey/client"
"github.com/openpubkey/openpubkey/providers"
"github.com/openpubkey/openpubkey/verifier"
)
type Opts struct {
altOp providers.OpenIdProvider
}
func SignWithGitlab(opts ...Opts) error {
var op providers.OpenIdProvider
// If an alternative OP is provided, use that instead of the default.
// Currently only used for testing where a mockOP is provided.
if len(opts) > 0 && opts[0].altOp != nil {
op = opts[0].altOp
} else {
// Creates OpenID Provider (OP) configuration, this will be used to request the ID Token from Gitlab
op = providers.NewGitlabCiOpFromEnvironment("OPENPUBKEY_JWT")
}
// Creates a new OpenPubkey client
opkClient, err := client.New(op)
if err != nil {
return err
}
// Generates a PK Token by authorizing to the OpenID Provider
pkt, err := opkClient.Auth(context.Background())
if err != nil {
return err
}
// Serialize the PK Token to JSON so we can print it. Typically this
// serialization of the PK Token would be sent with the signed message
pktJson, err := pkt.MarshalJSON()
if err != nil {
return err
}
fmt.Println("pkt:", string(pktJson))
pktCom, _ := pkt.Compact()
b64pktCom := base64.StdEncoding.EncodeToString(pktCom)
fmt.Println("pkt compact:", string(b64pktCom))
// Create a verifier to check that the PK Token is well formed
// The OPK client does this as well, but for the purposes of the
// example we show how a relying party might verify a PK Token
verifier, err := verifier.New(op)
if err != nil {
return err
}
// Verify the PK Token. We supply the OP (gitlab) we wish to verify against
err = verifier.VerifyPKToken(context.Background(), pkt)
if err != nil {
return err
}
// Sign a message over the user's public key in the PK Token
msg := []byte("All is discovered - flee at once")
signedMsg, err := pkt.NewSignedMessage(msg, opkClient.GetSigner())
if err != nil {
return err
}
fmt.Println("signedMsg:", string(signedMsg))
// Verify the signed message
_, err = pkt.VerifySignedMessage(signedMsg)
if err != nil {
return err
}
fmt.Println("Success!")
return nil
}
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