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Log4j2 Appender plugin pushing logs in batches to Elasticsearch (2.x/5.x/6.x) clusters
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package org.appenders.log4j2.elasticsearch.jest;

/*-
 * #%L
 * log4j-elasticsearch
 * %%
 * Copyright (C) 2018 Rafal Foltynski
 * %%
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 * #L%
 */

import io.searchbox.client.config.ClientConfig;
import io.searchbox.client.config.HttpClientConfig;
import org.apache.http.conn.ssl.NoopHostnameVerifier;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.nio.conn.ssl.SSLIOSessionStrategy;
import org.apache.logging.log4j.core.config.ConfigurationException;
import org.apache.logging.log4j.core.config.Node;
import org.apache.logging.log4j.core.config.plugins.Plugin;
import org.apache.logging.log4j.core.config.plugins.PluginBuilderAttribute;
import org.apache.logging.log4j.core.config.plugins.PluginBuilderFactory;
import org.appenders.log4j2.elasticsearch.CertInfo;
import org.appenders.log4j2.elasticsearch.thirdparty.PemReader;

import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManagerFactory;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.GeneralSecurityException;
import java.security.KeyStore;

@Plugin(name = JKSCertInfo.PLUGIN_NAME, category = Node.CATEGORY, elementType = CertInfo.ELEMENT_TYPE)
public class JKSCertInfo implements CertInfo {

    static final String PLUGIN_NAME = "JKS";

    static final String configExceptionMessage = "Failed to apply SSL/TLS settings";

    private final String keystorePath;
    private final String truststorePath;
    private final String keystorePassword;
    private final String truststorePassword;

    protected JKSCertInfo(String keystorePath, String keystorePassword, String truststorePath, String truststorePassword) {
        this.keystorePath = keystorePath;
        this.keystorePassword = keystorePassword;
        this.truststorePath = truststorePath;
        this.truststorePassword = truststorePassword;
    }

    @Override
    public void applyTo(HttpClientConfig.Builder clientConfigBuilder) {

        try (
                FileInputStream keystoreFile = new FileInputStream(new File(keystorePath));
                FileInputStream truststoreFile = new FileInputStream(new File(truststorePath))
        ) {
            KeyStore keyStore = KeyStore.getInstance("jks");
            keyStore.load(keystoreFile, keystorePassword.toCharArray());
            KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
            keyManagerFactory.init(keyStore, keystorePassword.toCharArray());

            KeyStore trustStore = KeyStore.getInstance("jks");
            trustStore.load(truststoreFile, truststorePassword.toCharArray());

            TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
            trustManagerFactory.init(trustStore);

            SSLContext sslContext = SSLContext.getInstance("TLS");
            sslContext.init(keyManagerFactory.getKeyManagers(), trustManagerFactory.getTrustManagers(), null);

            // TODO: add support for hostname verification modes
            clientConfigBuilder.sslSocketFactory(new SSLConnectionSocketFactory(sslContext));
            clientConfigBuilder.httpsIOSessionStrategy(new SSLIOSessionStrategy(sslContext, new NoopHostnameVerifier()));

        } catch (IOException | GeneralSecurityException e) {
            throw new ConfigurationException(configExceptionMessage, e);
        }
    }

    @PluginBuilderFactory
    public static Builder newBuilder() {
        return new Builder();
    }

    public static class Builder implements org.apache.logging.log4j.core.util.Builder {

        public static final String EMPTY_PASSWORD = "";

        @PluginBuilderAttribute
        private String keystorePath;

        @PluginBuilderAttribute
        private String keystorePassword = EMPTY_PASSWORD;

        @PluginBuilderAttribute
        private String truststorePath;

        @PluginBuilderAttribute
        private String truststorePassword = EMPTY_PASSWORD;

        @Override
        public JKSCertInfo build() {
            if (keystorePath == null) {
                throw new ConfigurationException("No keystorePath provided for " + PLUGIN_NAME);
            }
            if (keystorePassword == null) {
                throw new ConfigurationException("No keystorePassword provided for " + PLUGIN_NAME);
            }
            if (truststorePath == null) {
                throw new ConfigurationException("No truststorePath provided for " + PLUGIN_NAME);
            }
            if (truststorePassword == null) {
                throw new ConfigurationException("No truststorePassword provided for " + PLUGIN_NAME);
            }
            return new JKSCertInfo(keystorePath, keystorePassword, truststorePath, truststorePassword);
        }

        public Builder withKeystorePath(String keystorePath) {
            this.keystorePath = keystorePath;
            return this;
        }

        public Builder withKeystorePassword(String keystorePassword) {
            this.keystorePassword = keystorePassword;
            return this;
        }

        public Builder withTruststorePath(String truststorePath) {
            this.truststorePath = truststorePath;
            return this;
        }

        public Builder withTruststorePassword(String truststorePassword) {
            this.truststorePassword = truststorePassword;
            return this;
        }

    }
}