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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.portalng.bff.config;
import com.nimbusds.jwt.JWTParser;
import java.text.ParseException;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import org.springframework.util.AntPathMatcher;
import org.springframework.web.reactive.function.client.ClientRequest;
import org.springframework.web.reactive.function.client.ClientResponse;
import org.springframework.web.reactive.function.client.ExchangeFilterFunction;
import org.springframework.web.reactive.function.client.ExchangeFunction;
import org.springframework.web.server.ServerWebExchange;
import org.zalando.problem.Problem;
import org.zalando.problem.Status;
import reactor.core.Exceptions;
import reactor.core.publisher.Mono;
public class IdTokenExchangeFilterFunction implements ExchangeFilterFunction {
public static final String X_AUTH_IDENTITY_HEADER = "X-Auth-Identity";
public static final String CLAIM_NAME_ROLES = "roles";
private static final List<String> EXCLUDED_PATHS_PATTERNS =
List.of(
"/actuator/**", "**/actuator/**", "*/actuator/**", "/**/actuator/**", "/*/actuator/**");
private static final Mono<ServerWebExchange> serverWebExchangeFromContext =
Mono.deferContextual(Mono::just)
.filter(context -> context.hasKey(ServerWebExchange.class))
.map(context -> context.get(ServerWebExchange.class));
@Override
public Mono<ClientResponse> filter(ClientRequest request, ExchangeFunction next) {
boolean shouldNotFilter =
EXCLUDED_PATHS_PATTERNS.stream()
.anyMatch(
excludedPath ->
new AntPathMatcher().match(excludedPath, request.url().getRawPath()));
if (shouldNotFilter) {
return next.exchange(request).switchIfEmpty(Mono.defer(() -> next.exchange(request)));
}
return extractServerWebExchange(request)
.flatMap(IdTokenExchangeFilterFunction::extractIdentityHeader)
.map(idToken -> ClientRequest.from(request).header(X_AUTH_IDENTITY_HEADER, idToken).build())
.flatMap(requestWithIdToken -> next.exchange(requestWithIdToken))
.switchIfEmpty(Mono.defer(() -> next.exchange(request)));
}
private Mono<ServerWebExchange> extractServerWebExchange(ClientRequest request) {
return Mono.justOrEmpty(request.attribute(ServerWebExchange.class.getName()))
.cast(ServerWebExchange.class)
.switchIfEmpty(serverWebExchangeFromContext);
}
private static Mono<String> extractIdentityHeader(ServerWebExchange exchange) {
return Mono.just(exchange)
.map(exch -> exch.getRequest().getHeaders().getOrEmpty(X_AUTH_IDENTITY_HEADER).get(0))
.onErrorResume(ex -> Mono.error(Problem.valueOf(Status.FORBIDDEN, "ID token is missing")));
}
private static Mono<String> extractIdToken(ServerWebExchange exchange) {
return extractIdentityHeader(exchange)
.map(identityHeader -> identityHeader.replace("Bearer ", ""));
}
public static Mono<Void> validateAccess(
ServerWebExchange exchange, List<String> rolesListForMethod) {
return extractRoles(exchange)
.map(roles -> roles.stream().anyMatch(rolesListForMethod::contains))
.flatMap(
match ->
Boolean.TRUE.equals(match)
? Mono.empty()
: Mono.error(Problem.valueOf(Status.FORBIDDEN)));
}
private static Mono<List<String>> extractRoles(ServerWebExchange exchange) {
return extractIdToken(exchange)
.map(
token -> {
try {
return JWTParser.parse(token);
} catch (ParseException e) {
throw Exceptions.propagate(e);
}
})
.map(
jwt -> {
try {
return Optional.of(jwt.getJWTClaimsSet());
} catch (ParseException e) {
throw Exceptions.propagate(e);
}
})
.map(
optionalClaimsSet ->
optionalClaimsSet
.map(claimsSet -> claimsSet.getClaim(CLAIM_NAME_ROLES))
.map(obj -> (List<String>) obj))
.map(roles -> roles.orElse(Collections.emptyList()));
}
}
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