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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.runtime.security;

import org.apache.flink.annotation.Internal;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.security.auth.login.AppConfigurationEntry;

import java.io.File;
import java.util.HashMap;
import java.util.Map;

import static org.apache.flink.util.Preconditions.checkNotNull;

/**
 * Provides vendor-specific Kerberos {@link AppConfigurationEntry} instances.
 *
 * The implementation is inspired from Hadoop UGI class.
 */
@Internal
public class KerberosUtils {

	private static final Logger LOG = LoggerFactory.getLogger(KerberosUtils.class);

	private static final String JAVA_VENDOR_NAME = System.getProperty("java.vendor");

	private static final boolean IBM_JAVA;

	private static final Map debugOptions = new HashMap<>();

	private static final Map kerberosCacheOptions = new HashMap<>();

	private static final AppConfigurationEntry userKerberosAce;

	/* Return the Kerberos login module name */
	public static String getKrb5LoginModuleName() {
		return System.getProperty("java.vendor").contains("IBM")
			? "com.ibm.security.auth.module.Krb5LoginModule"
			: "com.sun.security.auth.module.Krb5LoginModule";
	}

	static {

		IBM_JAVA = JAVA_VENDOR_NAME.contains("IBM");

		if (LOG.isDebugEnabled()) {
			debugOptions.put("debug", "true");
		}

		if (IBM_JAVA) {
			kerberosCacheOptions.put("useDefaultCcache", "true");
		} else {
			kerberosCacheOptions.put("doNotPrompt", "true");
			kerberosCacheOptions.put("useTicketCache", "true");
		}

		String ticketCache = System.getenv("KRB5CCNAME");
		if (ticketCache != null) {
			if (IBM_JAVA) {
				System.setProperty("KRB5CCNAME", ticketCache);
			} else {
				kerberosCacheOptions.put("ticketCache", ticketCache);
			}
		}

		kerberosCacheOptions.put("renewTGT", "true");
		kerberosCacheOptions.putAll(debugOptions);

		userKerberosAce = new AppConfigurationEntry(
				getKrb5LoginModuleName(),
				AppConfigurationEntry.LoginModuleControlFlag.OPTIONAL,
				kerberosCacheOptions);

	}

	public static AppConfigurationEntry ticketCacheEntry() {
		return userKerberosAce;
	}

	public static AppConfigurationEntry keytabEntry(String keytab, String principal) {

		checkNotNull(keytab, "keytab");
		checkNotNull(principal, "principal");

		Map keytabKerberosOptions = new HashMap<>();

		if (IBM_JAVA) {
			keytabKerberosOptions.put("useKeytab", prependFileUri(keytab));
			keytabKerberosOptions.put("credsType", "both");
		} else {
			keytabKerberosOptions.put("keyTab", keytab);
			keytabKerberosOptions.put("doNotPrompt", "true");
			keytabKerberosOptions.put("useKeyTab", "true");
			keytabKerberosOptions.put("storeKey", "true");
		}

		keytabKerberosOptions.put("principal", principal);
		keytabKerberosOptions.put("refreshKrb5Config", "true");
		keytabKerberosOptions.putAll(debugOptions);

		AppConfigurationEntry keytabKerberosAce = new AppConfigurationEntry(
				getKrb5LoginModuleName(),
				AppConfigurationEntry.LoginModuleControlFlag.REQUIRED,
				keytabKerberosOptions);

		return keytabKerberosAce;
	}

	private static String prependFileUri(String keytabPath) {
		File f = new File(keytabPath);
		return f.toURI().toString();
	}
}