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/**************************************************************************
 * copyright file="EwsX509TrustManager.java" company="Microsoft"
 *     Copyright (c) Microsoft Corporation.  All rights reserved.
 * 
 * Defines the EwsX509TrustManager.java.
 **************************************************************************/
package microsoft.exchange.webservices.data;

/***
 * EwsX509TrustManager is used for SSL handshake.
 * 
 */
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;

class EwsX509TrustManager implements X509TrustManager
{
	/** The Standard TrustManager. */
	private X509TrustManager standardTrustManager = null;

	/**
	 * Constructor for EasyX509TrustManager.
	 */
	public EwsX509TrustManager(KeyStore keystore, TrustManager trustManager) throws NoSuchAlgorithmException, KeyStoreException {
		super();
		if(trustManager == null) {
			TrustManagerFactory factory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
			factory.init(keystore);
			TrustManager[] trustmanagers = factory.getTrustManagers();
			if (trustmanagers.length == 0) {
				throw new NoSuchAlgorithmException("no trust manager found");
			}
			this.standardTrustManager = (X509TrustManager)trustmanagers[0];
		}
		else {
			standardTrustManager = (X509TrustManager) trustManager;
		}
	}

	/**
	 * @see javax.net.ssl.X509TrustManager#checkClientTrusted(X509Certificate[],String authType)
	 */
	public void checkClientTrusted(X509Certificate[] certificates,String authType) throws CertificateException {
		standardTrustManager.checkClientTrusted(certificates,authType);
	}

	/**
	 * @see javax.net.ssl.X509TrustManager#checkServerTrusted(X509Certificate[],String authType)
	 */
	public void checkServerTrusted(X509Certificate[] certificates,String authType) throws CertificateException {

		if ((certificates != null) && (certificates.length == 1)) {
			certificates[0].checkValidity();
		} else {
			standardTrustManager.checkServerTrusted(certificates,authType);
		}
	}

	/**
	 * @see javax.net.ssl.X509TrustManager#getAcceptedIssuers()
	 */
	public X509Certificate[] getAcceptedIssuers() {
		return this.standardTrustManager.getAcceptedIssuers();
	}
}