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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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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.sshd.common.keyprovider;

import java.security.KeyPair;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.TreeMap;
import java.util.function.Function;

import org.apache.sshd.common.config.keys.KeyUtils;
import org.apache.sshd.common.session.SessionContext;
import org.apache.sshd.common.util.GenericUtils;
import org.apache.sshd.common.util.ValidateUtils;

/**
 * Holds a {@link Map} of {@link String}->{@link KeyPair} where the map key is the type and value is the associated
 * {@link KeyPair}
 *
 * @author Apache MINA SSHD Project
 */
public class MappedKeyPairProvider implements KeyPairProvider {
    /**
     * Transforms a {@link Map} of {@link String}->{@link KeyPair} to a {@link KeyPairProvider} where map key is the
     * type and value is the associated {@link KeyPair}
     */
    public static final Function, KeyPairProvider> MAP_TO_KEY_PAIR_PROVIDER = MappedKeyPairProvider::new;

    private final Map pairsMap;

    public MappedKeyPairProvider(KeyPair... pairs) {
        this(GenericUtils.isEmpty(pairs) ? Collections.emptyList() : Arrays.asList(pairs));
    }

    public MappedKeyPairProvider(Collection pairs) {
        this(mapUniquePairs(pairs));
    }

    public MappedKeyPairProvider(Map pairsMap) {
        this.pairsMap = ValidateUtils.checkNotNullAndNotEmpty(pairsMap, "No pairs map provided");
    }

    @Override
    public Iterable loadKeys(SessionContext session) {
        return pairsMap.values();
    }

    @Override
    public KeyPair loadKey(SessionContext session, String type) {
        return pairsMap.get(type);
    }

    @Override
    public Iterable getKeyTypes(SessionContext session) {
        return pairsMap.keySet();
    }

    @Override
    public String toString() {
        return String.valueOf(pairsMap.keySet());
    }

    public static Map mapUniquePairs(Collection pairs) {
        if (GenericUtils.isEmpty(pairs)) {
            return Collections.emptyMap();
        }

        Map pairsMap = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
        for (KeyPair kp : pairs) {
            String keyType = ValidateUtils.checkNotNullAndNotEmpty(KeyUtils.getKeyType(kp), "Cannot determine key type");
            KeyPair prev = pairsMap.put(keyType, kp);
            ValidateUtils.checkTrue(prev == null, "Multiple keys of type=%s", keyType);
        }

        return pairsMap;
    }
}