httpclient.kt

/*
 * This Kotlin source file was generated by the Gradle 'init' task.
 */
package old.fashion.java.client

import java.io.File
import java.io.FileInputStream
import java.net.URI
import java.net.http.HttpClient
import java.net.http.HttpRequest
import java.net.http.HttpResponse
import java.security.KeyStore
import java.security.cert.Certificate
import java.security.cert.CertificateFactory
import javax.net.ssl.SSLContext
import javax.net.ssl.TrustManagerFactory

class App {
    fun run() {
        val keyStore = keyStore()
        val trustFactory =
            TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm())
        trustFactory.init(keyStore)
        val sslContext = SSLContext.getInstance("SSL")
        sslContext.init(null, trustFactory.trustManagers, null)

        val httpClient = HttpClient.newBuilder()
            .sslContext(sslContext)
            .sslParameters(sslContext.defaultSSLParameters.apply {
                serverNames = null
            })
            .build()

        val request = HttpRequest.newBuilder()
            .uri(URI.create("https://example.com/hello"))
            .GET()
            .build()

        httpClient.send(request, HttpResponse.BodyHandlers.ofString())
    }

    private fun keyStore(): KeyStore? {
        val crtFile =
            File("/home/me/fullcert.pem")
        val certificate: Certificate =
            CertificateFactory.getInstance("X.509").generateCertificate(FileInputStream(crtFile))

        val keyStore = KeyStore.getInstance(KeyStore.getDefaultType())
        keyStore.load(null, null)
        keyStore.setCertificateEntry("server", certificate)
        return keyStore
    }
}

fun main(args: Array<String>) {
//    System.setProperty("javax.net.debug", "all");
//    System.setProperty("jsse.enableSNIExtension", "false")    
    App().run()
}