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 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */

package java.security;

import java.net.URI;
import java.util.*;
import static java.security.KeyStore.*;

/**
 * Configuration data that specifies the keystores in a keystore domain.
 * A keystore domain is a collection of keystores that are presented as a
 * single logical keystore. The configuration data is used during
 * {@code KeyStore}
 * {@link KeyStore#load(KeyStore.LoadStoreParameter) load} and
 * {@link KeyStore#store(KeyStore.LoadStoreParameter) store} operations.
 * <p>
 * The following syntax is supported for configuration data:
 * <pre>{@code
 *     domain <domainName> [<property> ...] {
 *         keystore <keystoreName> [<property> ...] ;
 *         ...
 *     };
 *     ...
 * }</pre>
 * where {@code domainName} and {@code keystoreName} are identifiers
 * and {@code property} is a key/value pairing. The key and value are
 * separated by an 'equals' symbol and the value is enclosed in double
 * quotes. A property value may be either a printable string or a binary
 * string of colon-separated pairs of hexadecimal digits. Multi-valued
 * properties are represented as a comma-separated list of values,
 * enclosed in square brackets.
 * See {@link Arrays#toString(java.lang.Object[])}.
 * <p>
 * To ensure that keystore entries are uniquely identified, each
 * entry's alias is prefixed by its {@code keystoreName} followed
 * by the entry name separator and each {@code keystoreName} must be
 * unique within its domain. Entry name prefixes are omitted when
 * storing a keystore.
 * <p>
 * Properties are context-sensitive: properties that apply to
 * all the keystores in a domain are located in the domain clause,
 * and properties that apply only to a specific keystore are located
 * in that keystore's clause.
 * Unless otherwise specified, a property in a keystore clause overrides
 * a property of the same name in the domain clause. All property names
 * are case-insensitive. The following properties are supported:
 * <dl>
 * <dt> {@code keystoreType="<type>"} </dt>
 *     <dd> The keystore type. </dd>
 * <dt> {@code keystoreURI="<url>"} </dt>
 *     <dd> The keystore location. </dd>
 * <dt> {@code keystoreProviderName="<name>"} </dt>
 *     <dd> The name of the keystore's JCE provider. </dd>
 * <dt> {@code keystorePasswordEnv="<environment-variable>"} </dt>
 *     <dd> The environment variable that stores a keystore password.
 *          Alternatively, passwords may be supplied to the constructor
 *          method in a {@code Map<String, ProtectionParameter>}. </dd>
 * <dt> {@code entryNameSeparator="<separator>"} </dt>
 *     <dd> The separator between a keystore name prefix and an entry name.
 *          When specified, it applies to all the entries in a domain.
 *          Its default value is a space. </dd>
 * </dl>
 * <p>
 * For example, configuration data for a simple keystore domain
 * comprising three keystores is shown below:
 * <pre>
 *
 * domain app1 {
 *     keystore app1-truststore
 *         keystoreURI="file:///app1/etc/truststore.jks";
 *
 *     keystore system-truststore
 *         keystoreURI="${java.home}/lib/security/cacerts";
 *
 *     keystore app1-keystore
 *         keystoreType="PKCS12"
 *         keystoreURI="file:///app1/etc/keystore.p12";
 * };
 *
 * </pre>
 * @since 1.8
 */
public final class DomainLoadStoreParameter implements LoadStoreParameter {

    private final URI configuration;
    private final Map<String,ProtectionParameter> protectionParams;

    /**
     * Constructs a DomainLoadStoreParameter for a keystore domain with
     * the parameters used to protect keystore data.
     *
     * @param configuration identifier for the domain configuration data.
     *     The name of the target domain should be specified in the
     *     {@code java.net.URI} fragment component when it is necessary
     *     to distinguish between several domain configurations at the
     *     same location.
     *
     * @param protectionParams the map from keystore name to the parameter
     *     used to protect keystore data.
     *     A {@code java.util.Collections.EMPTY_MAP} should be used
     *     when protection parameters are not required or when they have
     *     been specified by properties in the domain configuration data.
     *     It is cloned to prevent subsequent modification.
     *
     * @exception NullPointerException if {@code configuration} or
     *     {@code protectionParams} is {@code null}
     */
    public DomainLoadStoreParameter(URI configuration,
        Map<String,ProtectionParameter> protectionParams) {
        if (configuration == null || protectionParams == null) {
            throw new NullPointerException("invalid null input");
        }
        this.configuration = configuration;
        this.protectionParams =
            Collections.unmodifiableMap(new HashMap<>(protectionParams));
    }

    /**
     * Gets the identifier for the domain configuration data.
     *
     * @return the identifier for the configuration data
     */
    public URI getConfiguration() {
        return configuration;
    }

    /**
     * Gets the keystore protection parameters for keystores in this
     * domain.
     *
     * @return an unmodifiable map of keystore names to protection
     *     parameters
     */
    public Map<String,ProtectionParameter> getProtectionParams() {
        return protectionParams;
    }

    /**
     * Gets the keystore protection parameters for this domain.
     * Keystore domains do not support a protection parameter.
     *
     * @return always returns {@code null}
     */
    @Override
    public KeyStore.ProtectionParameter getProtectionParameter() {
        return null;
    }
}