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ClientCredentialsFlow.java
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ClientCredentialsFlow.java
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/*
* Copyright (c) 2021 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.connectivity.service.messaging.httppush;
import org.eclipse.ditto.internal.utils.cache.Cache;
import org.eclipse.ditto.jwt.model.JsonWebToken;
import org.eclipse.ditto.jwt.model.JwtInvalidException;
import org.apache.pekko.NotUsed;
import org.apache.pekko.http.javadsl.model.HttpRequest;
import org.apache.pekko.http.javadsl.model.headers.HttpCredentials;
import org.apache.pekko.japi.Pair;
import org.apache.pekko.stream.javadsl.Flow;
/**
* Flow of HTTP requests that authenticate via client-credentials flow.
*/
public final class ClientCredentialsFlow {
private static final String TOKEN_KEY = "token";
private final Cache<String, JsonWebToken> tokenCache;
ClientCredentialsFlow(final Cache<String, JsonWebToken> tokenCache) {
this.tokenCache = tokenCache;
}
/**
* Create a {@code ClientCredentialsFlow} object.
*
* @param tokenCache the cache that holds valid tokens and refreshes them when required.
* @return the object.
*/
public static ClientCredentialsFlow of(final Cache<String, JsonWebToken> tokenCache) {
return new ClientCredentialsFlow(tokenCache);
}
Flow<Pair<HttpRequest, HttpPushContext>, Pair<HttpRequest, HttpPushContext>, NotUsed> getFlow() {
final var flow = Flow.<Pair<HttpRequest, HttpPushContext>>create();
return flow.mapAsync(1, httpRequest -> tokenCache.get(TOKEN_KEY)
.thenApply(jwt -> Pair.create(httpRequest, jwt.orElseThrow(
() -> JwtInvalidException.newBuilder().message("Failed to retrieve JSON Web Token.").build()))))
.map(ClientCredentialsFlow::augmentRequestWithJwt);
}
private static Pair<HttpRequest, HttpPushContext> augmentRequestWithJwt(
final Pair<Pair<HttpRequest, HttpPushContext>, JsonWebToken> pair) {
final var jwt = pair.second();
final var context = pair.first().second();
final var augmentedRequest =
pair.first().first().addCredentials(HttpCredentials.createOAuth2BearerToken(jwt.getToken()));
return Pair.create(augmentedRequest, context);
}
}