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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.HttpClientConfig;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.impl.client.BasicCredentialsProvider;
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.apache.logging.log4j.core.config.plugins.validation.constraints.Required;
import org.appenders.log4j2.elasticsearch.Credentials;

@Plugin(name = BasicCredentials.PLUGIN_NAME, category = Node.CATEGORY, elementType = Credentials.ELEMENT_TYPE)
public final class BasicCredentials implements Credentials {

    static final String PLUGIN_NAME = "BasicCredentials";

    private final String username;
    private final String password;

    protected BasicCredentials(String username, String password) {
        this.username = username;
        this.password = password;
    }

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

        BasicCredentialsProvider basicCredentialsProvider = new BasicCredentialsProvider();
        basicCredentialsProvider.setCredentials(
                AuthScope.ANY,
                new UsernamePasswordCredentials(username, password)
        );

        builder.credentialsProvider(basicCredentialsProvider);

    }

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

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

        @PluginBuilderAttribute
        @Required(message = "No username provided for " + BasicCredentials.PLUGIN_NAME)
        private String username;

        @PluginBuilderAttribute
        @Required(message = "No password provided for " + BasicCredentials.PLUGIN_NAME)
        private String password;

        @Override
        public BasicCredentials build() {
            if (username == null) {
                throw new ConfigurationException("No username provided for " + BasicCredentials.PLUGIN_NAME);
            }
            if (password == null) {
                throw new ConfigurationException("No password provided for " + BasicCredentials.PLUGIN_NAME);
            }
            return new BasicCredentials(username, password);
        }

        public Builder withUsername(String username) {
            this.username = username;
            return this;
        }

        public Builder withPassword(String password) {
            this.password = password;
            return this;
        }

    }
}