/*
Copyright 2024 The Kubernetes Authors.

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 serviceaccount

import (
	"testing"

	"k8s.io/client-go/util/keyutil"
)

const rsaPublicKey = `-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA249XwEo9k4tM8fMxV7zx
OhcrP+WvXn917koM5Qr2ZXs4vo26e4ytdlrV0bQ9SlcLpQVSYjIxNfhTZdDt+ecI
zshKuv1gKIxbbLQMOuK1eA/4HALyEkFgmS/tleLJrhc65tKPMGD+pKQ/xhmzRuCG
51RoiMgbQxaCyYxGfNLpLAZK9L0Tctv9a0mJmGIYnIOQM4kC1A1I1n3EsXMWmeJU
j7OTh/AjjCnMnkgvKT2tpKxYQ59PgDgU8Ssc7RDSmSkLxnrv+OrN80j6xrw0OjEi
B4Ycr0PqfzZcvy8efTtFQ/Jnc4Bp1zUtFXt7+QeevePtQ2EcyELXE0i63T1CujRM
WwIDAQAB
-----END PUBLIC KEY-----
`

func TestKeyIDStability(t *testing.T) {
	keys, err := keyutil.ParsePublicKeysPEM([]byte(rsaPublicKey))
	if err != nil {
		t.Fatal(err)
	}
	keyID, err := keyIDFromPublicKey(keys[0])
	if err != nil {
		t.Fatal(err)
	}
	// The derived key id for a given public key must not change or validation of previously issued tokens will fail to find associated keys
	if expected, actual := "JHJehTTTZlsspKHT-GaJxK7Kd1NQgZJu3fyK6K_QDYU", keyID; expected != actual {
		t.Fatalf("expected stable key id %q, got %q", expected, actual)
	}
}