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	/*
	* Copyright (c) 2000, 2017, 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
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package java.security.cert;

	import java.security.AccessController;
	import java.security.InvalidAlgorithmParameterException;
	import java.security.NoSuchAlgorithmException;
	import java.security.NoSuchProviderException;
	import java.security.PrivilegedAction;
	import java.security.Provider;
	import java.security.Security;
	import java.util.Objects;

	import sun.security.jca.*;
	import sun.security.jca.GetInstance.Instance;

	/**
	* A class for validating certification paths (also known as certificate
	* chains).
	* <p>
	* This class uses a provider-based architecture.
	* To create a {@code CertPathValidator},
	* call one of the static {@code getInstance} methods, passing in the
	* algorithm name of the {@code CertPathValidator} desired and
	* optionally the name of the provider desired.
	*
	* <p>Once a {@code CertPathValidator} object has been created, it can
	* be used to validate certification paths by calling the {@link #validate
	* validate} method and passing it the {@code CertPath} to be validated
	* and an algorithm-specific set of parameters. If successful, the result is
	* returned in an object that implements the
	* {@code CertPathValidatorResult} interface.
	*
	* <p>The {@link #getRevocationChecker} method allows an application to specify
	* additional algorithm-specific parameters and options used by the
	* {@code CertPathValidator} when checking the revocation status of
	* certificates. Here is an example demonstrating how it is used with the PKIX
	* algorithm:
	*
	* <pre>
	* CertPathValidator cpv = CertPathValidator.getInstance("PKIX");
	* PKIXRevocationChecker rc = (PKIXRevocationChecker)cpv.getRevocationChecker();
	* rc.setOptions(EnumSet.of(Option.SOFT_FAIL));
	* params.addCertPathChecker(rc);
	* CertPathValidatorResult cpvr = cpv.validate(path, params);
	* </pre>
	*
	* <p>Every implementation of the Java platform is required to support the
	* following standard {@code CertPathValidator} algorithm:
	* <ul>
	* <li>{@code PKIX}</li>
	* </ul>
	* This algorithm is described in the <a href=
	* "{@docRoot}/../specs/security/standard-names.html#certpathvalidator-algorithms">
	* CertPathValidator section</a> of the
	* Java Security Standard Algorithm Names Specification.
	* Consult the release documentation for your implementation to see if any
	* other algorithms are supported.
	*
	* <p>
	* <b>Concurrent Access</b>
	* <p>
	* The static methods of this class are guaranteed to be thread-safe.
	* Multiple threads may concurrently invoke the static methods defined in
	* this class with no ill effects.
	* <p>
	* However, this is not true for the non-static methods defined by this class.
	* Unless otherwise documented by a specific provider, threads that need to
	* access a single {@code CertPathValidator} instance concurrently should
	* synchronize amongst themselves and provide the necessary locking. Multiple
	* threads each manipulating a different {@code CertPathValidator}
	* instance need not synchronize.
	*
	* @see CertPath
	*
	* @since 1.4
	* @author Yassir Elley
	*/
	public class CertPathValidator {

	/*
	* Constant to lookup in the Security properties file to determine
	* the default certpathvalidator type. In the Security properties file,
	* the default certpathvalidator type is given as:
	* <pre>
	* certpathvalidator.type=PKIX
	* </pre>
	*/
	private static final String CPV_TYPE = "certpathvalidator.type";
	private final CertPathValidatorSpi validatorSpi;
	private final Provider provider;
	private final String algorithm;

	/**
	* Creates a {@code CertPathValidator} object of the given algorithm,
	* and encapsulates the given provider implementation (SPI object) in it.
	*
	* @param validatorSpi the provider implementation
	* @param provider the provider
	* @param algorithm the algorithm name
	*/
	protected CertPathValidator(CertPathValidatorSpi validatorSpi,
	Provider provider, String algorithm)
	{
	this.validatorSpi = validatorSpi;
	this.provider = provider;
	this.algorithm = algorithm;
	}

	/**
	* Returns a {@code CertPathValidator} object that implements the
	* specified algorithm.
	*
	* <p> This method traverses the list of registered security Providers,
	* starting with the most preferred Provider.
	* A new CertPathValidator object encapsulating the
	* CertPathValidatorSpi implementation from the first
	* Provider that supports the specified algorithm is returned.
	*
	* <p> Note that the list of registered providers may be retrieved via
	* the {@link Security#getProviders() Security.getProviders()} method.
	*
	* @implNote
	* The JDK Reference Implementation additionally uses the
	* {@code jdk.security.provider.preferred}
	* {@link Security#getProperty(String) Security} property to determine
	* the preferred provider order for the specified algorithm. This
	* may be different than the order of providers returned by
	* {@link Security#getProviders() Security.getProviders()}.
	*
	* @param algorithm the name of the requested {@code CertPathValidator}
	* algorithm. See the CertPathValidator section in the <a href=
	* "{@docRoot}/../specs/security/standard-names.html#certpathvalidator-algorithms">
	* Java Security Standard Algorithm Names Specification</a>
	* for information about standard algorithm names.
	*
	* @return a {@code CertPathValidator} object that implements the
	* specified algorithm
	*
	* @throws NoSuchAlgorithmException if no {@code Provider} supports a
	* {@code CertPathValidatorSpi} implementation for the
	* specified algorithm
	*
	* @throws NullPointerException if {@code algorithm} is {@code null}
	*
	* @see java.security.Provider
	*/
	public static CertPathValidator getInstance(String algorithm)
	throws NoSuchAlgorithmException {
	Objects.requireNonNull(algorithm, "null algorithm name");
	Instance instance = GetInstance.getInstance("CertPathValidator",
	CertPathValidatorSpi.class, algorithm);
	return new CertPathValidator((CertPathValidatorSpi)instance.impl,
	instance.provider, algorithm);
	}

	/**
	* Returns a {@code CertPathValidator} object that implements the
	* specified algorithm.
	*
	* <p> A new CertPathValidator object encapsulating the
	* CertPathValidatorSpi implementation from the specified provider
	* is returned. The specified provider must be registered
	* in the security provider list.
	*
	* <p> Note that the list of registered providers may be retrieved via
	* the {@link Security#getProviders() Security.getProviders()} method.
	*
	* @param algorithm the name of the requested {@code CertPathValidator}
	* algorithm. See the CertPathValidator section in the <a href=
	* "{@docRoot}/../specs/security/standard-names.html#certpathvalidator-algorithms">
	* Java Security Standard Algorithm Names Specification</a>
	* for information about standard algorithm names.
	*
	* @param provider the name of the provider.
	*
	* @return a {@code CertPathValidator} object that implements the
	* specified algorithm
	*
	* @throws IllegalArgumentException if the {@code provider} is
	* {@code null} or empty
	*
	* @throws NoSuchAlgorithmException if a {@code CertPathValidatorSpi}
	* implementation for the specified algorithm is not
	* available from the specified provider
	*
	* @throws NoSuchProviderException if the specified provider is not
	* registered in the security provider list
	*
	* @throws NullPointerException if {@code algorithm} is {@code null}
	*
	* @see java.security.Provider
	*/
	public static CertPathValidator getInstance(String algorithm,
	String provider) throws NoSuchAlgorithmException,
	NoSuchProviderException {
	Objects.requireNonNull(algorithm, "null algorithm name");
	Instance instance = GetInstance.getInstance("CertPathValidator",
	CertPathValidatorSpi.class, algorithm, provider);
	return new CertPathValidator((CertPathValidatorSpi)instance.impl,
	instance.provider, algorithm);
	}

	/**
	* Returns a {@code CertPathValidator} object that implements the
	* specified algorithm.
	*
	* <p> A new CertPathValidator object encapsulating the
	* CertPathValidatorSpi implementation from the specified Provider
	* object is returned. Note that the specified Provider object
	* does not have to be registered in the provider list.
	*
	* @param algorithm the name of the requested {@code CertPathValidator}
	* algorithm. See the CertPathValidator section in the <a href=
	* "{@docRoot}/../specs/security/standard-names.html#certpathvalidator-algorithms">
	* Java Security Standard Algorithm Names Specification</a>
	* for information about standard algorithm names.
	*
	* @param provider the provider.
	*
	* @return a {@code CertPathValidator} object that implements the
	* specified algorithm
	*
	* @throws IllegalArgumentException if the {@code provider} is
	* {@code null}
	*
	* @throws NoSuchAlgorithmException if a {@code CertPathValidatorSpi}
	* implementation for the specified algorithm is not available
	* from the specified Provider object
	*
	* @throws NullPointerException if {@code algorithm} is {@code null}
	*
	* @see java.security.Provider
	*/
	public static CertPathValidator getInstance(String algorithm,
	Provider provider) throws NoSuchAlgorithmException {
	Objects.requireNonNull(algorithm, "null algorithm name");
	Instance instance = GetInstance.getInstance("CertPathValidator",
	CertPathValidatorSpi.class, algorithm, provider);
	return new CertPathValidator((CertPathValidatorSpi)instance.impl,
	instance.provider, algorithm);
	}

	/**
	* Returns the {@code Provider} of this
	* {@code CertPathValidator}.
	*
	* @return the {@code Provider} of this {@code CertPathValidator}
	*/
	public final Provider getProvider() {
	return this.provider;
	}

	/**
	* Returns the algorithm name of this {@code CertPathValidator}.
	*
	* @return the algorithm name of this {@code CertPathValidator}
	*/
	public final String getAlgorithm() {
	return this.algorithm;
	}

	/**
	* Validates the specified certification path using the specified
	* algorithm parameter set.
	* <p>
	* The {@code CertPath} specified must be of a type that is
	* supported by the validation algorithm, otherwise an
	* {@code InvalidAlgorithmParameterException} will be thrown. For
	* example, a {@code CertPathValidator} that implements the PKIX
	* algorithm validates {@code CertPath} objects of type X.509.
	*
	* @param certPath the {@code CertPath} to be validated
	* @param params the algorithm parameters
	* @return the result of the validation algorithm
	* @exception CertPathValidatorException if the {@code CertPath}
	* does not validate
	* @exception InvalidAlgorithmParameterException if the specified
	* parameters or the type of the specified {@code CertPath} are
	* inappropriate for this {@code CertPathValidator}
	*/
	public final CertPathValidatorResult validate(CertPath certPath,
	CertPathParameters params)
	throws CertPathValidatorException, InvalidAlgorithmParameterException
	{
	return validatorSpi.engineValidate(certPath, params);
	}

	/**
	* Returns the default {@code CertPathValidator} type as specified by
	* the {@code certpathvalidator.type} security property, or the string
	* {@literal "PKIX"} if no such property exists.
	*
	* <p>The default {@code CertPathValidator} type can be used by
	* applications that do not want to use a hard-coded type when calling one
	* of the {@code getInstance} methods, and want to provide a default
	* type in case a user does not specify its own.
	*
	* <p>The default {@code CertPathValidator} type can be changed by
	* setting the value of the {@code certpathvalidator.type} security
	* property to the desired type.
	*
	* @see java.security.Security security properties
	* @return the default {@code CertPathValidator} type as specified
	* by the {@code certpathvalidator.type} security property, or the string
	* {@literal "PKIX"} if no such property exists.
	*/
	public static final String getDefaultType() {
	String cpvtype =
	AccessController.doPrivileged(new PrivilegedAction<>() {
	public String run() {
	return Security.getProperty(CPV_TYPE);
	}
	});
	return (cpvtype == null) ? "PKIX" : cpvtype;
	}

	/**
	* Returns a {@code CertPathChecker} that the encapsulated
	* {@code CertPathValidatorSpi} implementation uses to check the revocation
	* status of certificates. A PKIX implementation returns objects of
	* type {@code PKIXRevocationChecker}. Each invocation of this method
	* returns a new instance of {@code CertPathChecker}.
	*
	* <p>The primary purpose of this method is to allow callers to specify
	* additional input parameters and options specific to revocation checking.
	* See the class description for an example.
	*
	* @return a {@code CertPathChecker}
	* @throws UnsupportedOperationException if the service provider does not
	* support this method
	* @since 1.8
	*/
	public final CertPathChecker getRevocationChecker() {
	return validatorSpi.engineGetRevocationChecker();
	}
	}

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