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/*
*
* Copyright (c) 2022. Deutsche Telekom AG
*
* 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.
*
* SPDX-License-Identifier: Apache-2.0
*
*
*/
package org.onap.portal.prefs.util;
import com.nimbusds.jwt.JWTClaimsSet;
import com.nimbusds.jwt.JWTParser;
import java.text.ParseException;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;
/**
* Represents a function that handles the <a href="https://jwt.io/introduction">JWT</a> identity token.
* Use this to check if the incoming requests are authorized to call the given endpoint
*/
public final class IdTokenExchange {
public static final String X_AUTH_IDENTITY_HEADER = "X-Auth-Identity";
public static final String JWT_CLAIM_USERID = "sub";
private IdTokenExchange(){
}
/**
* Extract the identity header from the given {@link ServerWebExchange}.
* @param exchange the ServerWebExchange that contains information about the incoming request
* @return the identity header in the form of <code>Bearer {@literal <Token>}<c/ode>
*/
private static Mono<String> extractIdentityHeader(ServerWebExchange exchange) {
return Mono.just(exchange.getRequest().getHeaders().getOrEmpty(X_AUTH_IDENTITY_HEADER))
.map(headers -> headers.get(0))
.onErrorResume(Exception.class, ex -> Mono.error(ex));
}
/**
* Extract the identity token from the given {@link ServerWebExchange}.
* @see <a href="https://openid.net/specs/openid-connect-core-1_0.html#IDToken">OpenId Connect ID Token</a>
* @param exchange the ServerWebExchange that contains information about the incoming request
* @return the identity token that contains user roles
*/
private static Mono<String> extractIdToken(ServerWebExchange exchange) {
return extractIdentityHeader(exchange)
.map(identityHeader -> identityHeader.replace("Bearer ", ""));
}
/**
* Extract the <code>userId</code> from the given {@link ServerWebExchange}
* @param exchange the ServerWebExchange that contains information about the incoming request
* @return the id of the user
*/
public static Mono<String> extractUserId(ServerWebExchange exchange) {
return extractIdToken(exchange)
.flatMap(idToken -> extractUserClaim(idToken));
}
private static Mono<String> extractUserClaim(String idToken) {
JWTClaimsSet jwtClaimSet;
try {
jwtClaimSet = JWTParser.parse(idToken).getJWTClaimsSet();
} catch (ParseException e) {
return Mono.error(e);
}
return Mono.just(String.class.cast(jwtClaimSet.getClaim(JWT_CLAIM_USERID)));
}
}
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