/*
 * Copyright 2002-2017 the original author or authors.
 *
 * 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
 *
 *      https://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.springframework.security.oauth2.core.oidc;

import java.net.URL;
import java.time.Instant;
import java.util.List;

import org.springframework.security.oauth2.core.ClaimAccessor;

/**
 * A {@link ClaimAccessor} for the &quot;claims&quot; that can be returned in the ID
 * Token, which provides information about the authentication of an End-User by an
 * Authorization Server.
 *
 * @author Joe Grandja
 * @since 5.0
 * @see ClaimAccessor
 * @see StandardClaimAccessor
 * @see StandardClaimNames
 * @see IdTokenClaimNames
 * @see OidcIdToken
 * @see <a target="_blank" href=
 * "https://openid.net/specs/openid-connect-core-1_0.html#IDToken">ID Token</a>
 * @see <a target="_blank" href=
 * "https://openid.net/specs/openid-connect-core-1_0.html#StandardClaims">Standard
 * Claims</a>
 */
public interface IdTokenClaimAccessor extends StandardClaimAccessor {

	/**
	 * Returns the Issuer identifier {@code (iss)}.
	 * @return the Issuer identifier
	 */
	default URL getIssuer() {
		return this.getClaimAsURL(IdTokenClaimNames.ISS);
	}

	/**
	 * Returns the Subject identifier {@code (sub)}.
	 * @return the Subject identifier
	 */
	@Override
	default String getSubject() {
		return this.getClaimAsString(IdTokenClaimNames.SUB);
	}

	/**
	 * Returns the Audience(s) {@code (aud)} that this ID Token is intended for.
	 * @return the Audience(s) that this ID Token is intended for
	 */
	default List<String> getAudience() {
		return this.getClaimAsStringList(IdTokenClaimNames.AUD);
	}

	/**
	 * Returns the Expiration time {@code (exp)} on or after which the ID Token MUST NOT
	 * be accepted.
	 * @return the Expiration time on or after which the ID Token MUST NOT be accepted
	 */
	default Instant getExpiresAt() {
		return this.getClaimAsInstant(IdTokenClaimNames.EXP);
	}

	/**
	 * Returns the time at which the ID Token was issued {@code (iat)}.
	 * @return the time at which the ID Token was issued
	 */
	default Instant getIssuedAt() {
		return this.getClaimAsInstant(IdTokenClaimNames.IAT);
	}

	/**
	 * Returns the time when the End-User authentication occurred {@code (auth_time)}.
	 * @return the time when the End-User authentication occurred
	 */
	default Instant getAuthenticatedAt() {
		return this.getClaimAsInstant(IdTokenClaimNames.AUTH_TIME);
	}

	/**
	 * Returns a {@code String} value {@code (nonce)} used to associate a Client session
	 * with an ID Token, and to mitigate replay attacks.
	 * @return the nonce used to associate a Client session with an ID Token
	 */
	default String getNonce() {
		return this.getClaimAsString(IdTokenClaimNames.NONCE);
	}

	/**
	 * Returns the Authentication Context Class Reference {@code (acr)}.
	 * @return the Authentication Context Class Reference
	 */
	default String getAuthenticationContextClass() {
		return this.getClaimAsString(IdTokenClaimNames.ACR);
	}

	/**
	 * Returns the Authentication Methods References {@code (amr)}.
	 * @return the Authentication Methods References
	 */
	default List<String> getAuthenticationMethods() {
		return this.getClaimAsStringList(IdTokenClaimNames.AMR);
	}

	/**
	 * Returns the Authorized party {@code (azp)} to which the ID Token was issued.
	 * @return the Authorized party to which the ID Token was issued
	 */
	default String getAuthorizedParty() {
		return this.getClaimAsString(IdTokenClaimNames.AZP);
	}

	/**
	 * Returns the Access Token hash value {@code (at_hash)}.
	 * @return the Access Token hash value
	 */
	default String getAccessTokenHash() {
		return this.getClaimAsString(IdTokenClaimNames.AT_HASH);
	}

	/**
	 * Returns the Authorization Code hash value {@code (c_hash)}.
	 * @return the Authorization Code hash value
	 */
	default String getAuthorizationCodeHash() {
		return this.getClaimAsString(IdTokenClaimNames.C_HASH);
	}

}
