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csr.go
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csr.go
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/*
Copyright 2021 The cert-manager 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 gen
import (
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"net"
"net/url"
"testing"
pkiutil "istio.io/istio/security/pkg/pki/util"
)
var (
// shared signer to reduce testing time
sk crypto.Signer
)
func init() {
var err error
sk, err = rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
panic(err)
}
}
type CSRBuilder struct {
ids, dns, ips, emails []string
cn string
}
type CSRModifier func(*CSRBuilder)
func MustCSR(t *testing.T, mods ...CSRModifier) []byte {
csr, err := CSR(mods...)
if err != nil {
t.Fatal(err)
}
return csr
}
func CSR(mods ...CSRModifier) ([]byte, error) {
csrBuilder := new(CSRBuilder)
for _, mod := range mods {
mod(csrBuilder)
}
opts := pkiutil.CertOptions{
IsServer: true,
RSAKeySize: 2048,
}
csr, err := pkiutil.GenCSRTemplate(opts)
if err != nil {
return nil, err
}
for _, id := range csrBuilder.ids {
url, err := url.Parse(id)
if err != nil {
return nil, err
}
csr.URIs = append(csr.URIs, url)
}
for _, ip := range csrBuilder.ips {
csr.IPAddresses = append(csr.IPAddresses, net.ParseIP(ip))
}
csr.DNSNames = csrBuilder.dns
csr.EmailAddresses = csrBuilder.emails
csr.Subject.CommonName = csrBuilder.cn
csrBytes, err := x509.CreateCertificateRequest(rand.Reader, csr, sk)
if err != nil {
return nil, err
}
return pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE REQUEST", Bytes: csrBytes}), nil
}
func SetCSRIdentities(ids []string) CSRModifier {
return func(csr *CSRBuilder) {
csr.ids = ids
}
}
func SetCSRDNS(dns []string) CSRModifier {
return func(csr *CSRBuilder) {
csr.dns = dns
}
}
func SetCSRIPs(ips []string) CSRModifier {
return func(csr *CSRBuilder) {
csr.ips = ips
}
}
func SetCSREmails(emails []string) CSRModifier {
return func(csr *CSRBuilder) {
csr.emails = emails
}
}
func SetCSRCommonName(cn string) CSRModifier {
return func(csr *CSRBuilder) {
csr.cn = cn
}
}