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/*
 * oauth2-oidc-sdk
 *
 * Copyright 2012-2016, Connect2id Ltd and contributors.
 *
 * Licensed 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 com.nimbusds.openid.connect.sdk.claims;


import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;

import com.nimbusds.jose.JWSAlgorithm;
import com.nimbusds.jose.jwk.Curve;
import com.nimbusds.jose.util.Base64URL;
import com.nimbusds.oauth2.sdk.id.Identifier;


/**
 * The base class for SHA-2 based claims.
 */
public abstract class HashClaim extends Identifier {
	
	
	private static final long serialVersionUID = -3163141692378087888L;
	
	
	/**
	 * Creates a new SHA-2 based claim with the specified value.
	 *
	 * @param value The claim value. Must not be {@code null}.
	 */
	protected HashClaim(final String value) {

		super(value);
	}


	/**
	 * Gets the matching SHA-2 message digest for the specified JSON Web
	 * Signature (JWS) algorithm.
	 *
	 * @param alg The JWS algorithm. Must not be {@code null}.
	 *
	 * @return The SHA-2 message digest, {@code null} if the JWS algorithm
	 *         or its corresponding SHA-2 message digest are not supported.
	 *
	 * @deprecated Use {@link #getMessageDigestInstance(JWSAlgorithm, Curve)}
	 * instead.
	 */
	@Deprecated
	public static MessageDigest getMessageDigestInstance(final JWSAlgorithm alg) {

		return getMessageDigestInstance(alg, null);
	}


	/**
	 * Gets the matching SHA-2 message digest for the specified JSON Web
	 * Signature (JWS) algorithm.
	 *
	 * @param alg The JWS algorithm. Must not be {@code null}.
	 * @param crv The JWK curve used with the JWS algorithm, {@code null}
	 *            if not applicable.
	 *
	 * @return The SHA-2 message digest, {@code null} if the JWS algorithm
	 *         or its corresponding SHA-2 message digest are not supported.
	 */
	public static MessageDigest getMessageDigestInstance(final JWSAlgorithm alg,
							     final Curve crv) {

		String mdAlg;

		if (alg.equals(JWSAlgorithm.HS256) ||
		    alg.equals(JWSAlgorithm.RS256) ||
		    alg.equals(JWSAlgorithm.ES256) ||
		    alg.equals(JWSAlgorithm.ES256K) ||
		    alg.equals(JWSAlgorithm.PS256)    ) {

			mdAlg = "SHA-256";

		} else if (alg.equals(JWSAlgorithm.HS384) ||
			   alg.equals(JWSAlgorithm.RS384) ||
			   alg.equals(JWSAlgorithm.ES384) ||
			   alg.equals(JWSAlgorithm.PS384)    ) {

			mdAlg = "SHA-384";

		} else if (alg.equals(JWSAlgorithm.HS512) ||
			   alg.equals(JWSAlgorithm.RS512) ||
			   alg.equals(JWSAlgorithm.ES512) ||
			   alg.equals(JWSAlgorithm.PS512) ||
			   alg.equals(JWSAlgorithm.EdDSA) && Curve.Ed25519.equals(crv)) {

			mdAlg = "SHA-512";

		} else {
			// unsupported JWS alg
			return null;
		}

		try {
			return MessageDigest.getInstance(mdAlg);

		} catch (NoSuchAlgorithmException e) {

			// unsupported SHA-2 alg
			return null;
		}
	}


	/**
	 * Computes the SHA-2 claim value for the specified identifier.
	 *
	 * @param identifier The identifier, typically an authorisation code or
	 *                   an access token.  Must not be {@code null}.
	 * @param alg        The reference JWS algorithm. Must not be
	 *                   {@code null}.
	 *
	 * @return The matching (truncated to first half) SHA-2 claim value,
	 *         or {@code null} if the JWS algorithm or its corresponding
	 *         SHA-2 message digest are not supported.
	 *
	 * @deprecated Use {@link #computeValue(Identifier, JWSAlgorithm, Curve)}
	 * instead.
	 */
	@Deprecated
	public static String computeValue(final Identifier identifier,
					  final JWSAlgorithm alg) {

		return computeValue(identifier, alg, null);
	}


	/**
	 * Computes the SHA-2 claim value for the specified identifier.
	 *
	 * @param identifier The identifier, typically an authorisation code or
	 *                   an access token.  Must not be {@code null}.
	 * @param alg        The reference JWS algorithm. Must not be
	 *                   {@code null}.
	 * @param crv        The JWK curve used with the JWS algorithm,
	 *                   {@code null} if not applicable.
	 *
	 * @return The matching (truncated to first half) SHA-2 claim value,
	 *         or {@code null} if the JWS algorithm or its corresponding
	 *         SHA-2 message digest are not supported.
	 */
	public static String computeValue(final Identifier identifier,
					  final JWSAlgorithm alg,
					  final Curve crv) {

		MessageDigest md = getMessageDigestInstance(alg, crv);

		if (md == null)
			return null;

		md.update(identifier.getValue().getBytes(StandardCharsets.US_ASCII));

		byte[] hash = md.digest();

		byte[] firstHalf = Arrays.copyOf(hash, hash.length / 2);

		return Base64URL.encode(firstHalf).toString();
	}
}