Created
July 14, 2022 13:20
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mTLS: use Client certificate
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import java.security.KeyFactory | |
import java.security.PrivateKey | |
import java.security.cert.Certificate | |
import java.security.cert.CertificateFactory | |
import java.security.interfaces.RSAPublicKey | |
import java.security.spec.PKCS8EncodededKeySpec | |
import java.security.spec.X509EncodededKeySpec | |
import java.util.Base64 | |
import java.io.BufferedInputStream | |
import java.io.ByteArrayInputStream | |
fun genPrivateKey(resource: String): PrivateKey { | |
val factory = KeyFactory.getInstance("RSA") | |
return resource | |
.run(::load) | |
.run(::PKCS8EncodedKeySpec) | |
.run(factory::generatePrivate) | |
} | |
fun genPublicKey(resource: String): RSAPublicKey { | |
val factory = KeyFactory.getInstance("RSA") | |
return resource | |
.run(::load) | |
.run(::X509EncodedKeySpec) | |
.run(factory::generatePublic) as RSAPublicKey | |
} | |
fun genCertificate(resource: String): Certificate { | |
val factory = CertificateFactory.getInstance("X.509") | |
return resource | |
.run(::load) | |
.run(::ByteArrayInputStream) | |
.use(factory::genCertificate) | |
} | |
fun load(resource: String): ByteArray { | |
fun String.dropComments(): String { | |
return this | |
.replace("-----BEGIN CERTIFICATE-----", "") | |
.replace("-----END CERTIFICATE-----", "") | |
.replace("-----BEGIN PUBLIC KEY-----", "") | |
.replace("-----END PUBLIC KEY-----", "") | |
.replace("-----BEGIN PRIVATE KEY-----", "") | |
.replace("-----END PRIVATE KEY-----", "") | |
.replace("\\s+".toRegex(), "") | |
.replace("\n", "") | |
} | |
return BufferedInputStream(resource.byteInputStream()) | |
.use { it.bufferedReader().readLines() } | |
.filter { it.isNotBlank() } | |
.joinToString(separator = "") | |
.dropComments() | |
.run(Base64.getDecoder()::decode) | |
} | |
fun getRestTemplate( | |
certpwd: String, | |
privateKey: String, | |
certificate: String | |
): RestTemplate { | |
val certPassword = certpwd.toCharArray() | |
val keystore: KeyStore = KeyStore.getInstance(KeyStore.getDefaultType()) | |
keystore.load(null, null) | |
keystore.setKeyEntry( | |
"", | |
genPrivateKey(privateKey), | |
certPassword, | |
arrayOf(genCertificate(certificate)) | |
) | |
val sslContext: SSLContext = SSLContextBuilder | |
.create() | |
.loadKeyMaterial( | |
keystore, | |
certPassword | |
) | |
.build() | |
val client: HttpClient = HttpClients.custom().setSSLContext(sslContext).build() | |
val requestFactory: ClientHttpRequestFactory = HttpComponentsClientHttpRequestFactory(client).apply { | |
setConnectionTimeout(5000) | |
setReadTimeout(5000) | |
} | |
return RestTemplateBuilder() | |
.requestFactory { requestFactory }.build() | |
} |
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