// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.athenz.tls;

import javax.net.ssl.KeyManager;
import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import java.io.File;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.file.Files;
import java.security.GeneralSecurityException;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.cert.X509Certificate;

/**
 * @author bjorncs
 */
public class SslContextBuilder {

    private KeyStoreSupplier trustStoreSupplier;
    private KeyStoreSupplier keyStoreSupplier;
    private char[] keyStorePassword;

    public SslContextBuilder() {}

    public SslContextBuilder withTrustStore(File file, KeyStoreType trustStoreType) {
        this.trustStoreSupplier = () -> KeyStoreBuilder.withType(trustStoreType).fromFile(file).build();
        return this;
    }

    public SslContextBuilder withTrustStore(KeyStore trustStore) {
        this.trustStoreSupplier = () -> trustStore;
        return this;
    }

    public SslContextBuilder withKeyStore(PrivateKey privateKey, X509Certificate certificate) {
        char[] pwd = new char[0];
        this.keyStoreSupplier = () -> KeyStoreBuilder.withType(KeyStoreType.JKS).withKeyEntry("default", privateKey, certificate).build();
        this.keyStorePassword = pwd;
        return this;
    }

    public SslContextBuilder withKeyStore(KeyStore keyStore, char[] password) {
        this.keyStoreSupplier = () -> keyStore;
        this.keyStorePassword = password;
        return this;
    }

    public SslContextBuilder withKeyStore(File file, char[] password, KeyStoreType keyStoreType) {
        this.keyStoreSupplier = () -> KeyStoreBuilder.withType(keyStoreType).fromFile(file, password).build();
        this.keyStorePassword = password;
        return this;
    }

    public SslContextBuilder withKeyStore(File privateKeyPemFile, File certificatePemFile) {
        this.keyStoreSupplier =
                () ->  {
                    PrivateKey privateKey = KeyUtils.fromPemEncodedPrivateKey(new String(Files.readAllBytes(privateKeyPemFile.toPath())));
                    X509Certificate certificate = X509CertificateUtils.fromPem(new String(Files.readAllBytes(certificatePemFile.toPath())));
                    return KeyStoreBuilder.withType(KeyStoreType.JKS)
                            .withKeyEntry("default", privateKey, certificate)
                            .build();
                };
        this.keyStorePassword = new char[0];
        return this;
    }

    public SSLContext build() {
        try {
            SSLContext sslContext = SSLContext.getInstance("TLSv1.2");
            TrustManager[] trustManagers =
                    trustStoreSupplier != null ? createTrustManagers(trustStoreSupplier) : null;
            KeyManager[] keyManagers =
                    keyStoreSupplier != null ? createKeyManagers(keyStoreSupplier, keyStorePassword) : null;
            sslContext.init(keyManagers, trustManagers, null);
            return sslContext;
        } catch (GeneralSecurityException e) {
            throw new RuntimeException(e);
        } catch (IOException e) {
            throw new UncheckedIOException(e);
        }
    }

    private static TrustManager[] createTrustManagers(KeyStoreSupplier trustStoreSupplier)
            throws GeneralSecurityException, IOException {
        TrustManagerFactory trustManagerFactory =
                TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
        trustManagerFactory.init(trustStoreSupplier.get());
        return trustManagerFactory.getTrustManagers();
    }

    private static KeyManager[] createKeyManagers(KeyStoreSupplier keyStoreSupplier, char[] password)
            throws GeneralSecurityException, IOException {
        KeyManagerFactory keyManagerFactory =
                KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
        keyManagerFactory.init(keyStoreSupplier.get(), password);
        return keyManagerFactory.getKeyManagers();
    }

    private interface KeyStoreSupplier {
        KeyStore get() throws IOException, GeneralSecurityException;
    }

}

@@ -446,16 +446,43 @@
 .Files;%0A
+import java.nio.file.Path;%0A
 import j
@@ -2125,24 +2125,210 @@
 ePemFile) %7B%0A
+        return withKeyStore(privateKeyPemFile.toPath(), certificatePemFile.toPath());%0A    %7D%0A%0A    public SslContextBuilder withKeyStore(Path privateKeyPemFile, Path certificatePemFile) %7B%0A
         this
@@ -2493,33 +2493,24 @@
 teKeyPemFile
-.toPath()
 )));%0A       
@@ -2629,25 +2629,16 @@
 ePemFile
-.toPath()
 )));%0A   

Add overloaded method taking Path instead of File