testhelpers_test.go

// Copyright (c) 2026 Tom Gelhausen; contributors: various coding‑agents.
//
// SPDX-License-Identifier: Apache-2.0
//
// 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 fanout

import (
	"crypto/rand"
	"crypto/rsa"
	"crypto/x509"
	"crypto/x509/pkix"
	"encoding/pem"
	"math/big"
	"net"
	"time"
)

func generateRSAKey() (*rsa.PrivateKey, error) {
	return rsa.GenerateKey(rand.Reader, 2048)
}

func generateSelfSignedCertDER(key *rsa.PrivateKey) ([]byte, error) {
	template := &x509.Certificate{
		SerialNumber: big.NewInt(1),
		Subject:      pkix.Name{Organization: []string{"Test"}},
		NotBefore:    time.Now().Add(-time.Hour),
		NotAfter:     time.Now().Add(24 * time.Hour),
		KeyUsage:     x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
		ExtKeyUsage:  []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
		IPAddresses:  []net.IP{net.ParseIP("127.0.0.1")},
		DNSNames:     []string{localhostName},
	}
	return x509.CreateCertificate(rand.Reader, template, template, &key.PublicKey, key)
}

func pemEncode(der []byte, blockType string) []byte {
	return pem.EncodeToMemory(&pem.Block{Type: blockType, Bytes: der})
}