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WebSocketJwtExtractor.java
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WebSocketJwtExtractor.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.gateway.service.security.authentication.jwt;
import java.util.Optional;
import org.eclipse.ditto.base.model.exceptions.DittoRuntimeException;
import org.eclipse.ditto.base.model.headers.DittoHeaders;
import org.eclipse.ditto.gateway.api.GatewayAuthenticationFailedException;
import org.eclipse.ditto.gateway.service.security.utils.HttpUtils;
import org.eclipse.ditto.jwt.model.ImmutableJsonWebToken;
import org.eclipse.ditto.jwt.model.JsonWebToken;
import org.apache.pekko.http.javadsl.server.RequestContext;
/**
* Implementation of {@link JwtExtractor} extracting
* the JWT from the {@code access_token} query parameter.
*/
final class WebSocketJwtExtractor implements JwtExtractor {
private static final String ACCESS_TOKEN_PARAM = "access_token";
private static final WebSocketJwtExtractor INSTANCE = new WebSocketJwtExtractor();
private final JwtExtractor defaultExtractor = DefaultJwtExtractor.getInstance();
private WebSocketJwtExtractor() {
}
/**
* @return the singleton instance of WebSocketJwtExtractor
*/
static JwtExtractor getInstance() {
return INSTANCE;
}
@Override
public Optional<JsonWebToken> apply(final RequestContext requestContext, final DittoHeaders dittoHeaders) {
final Optional<JsonWebToken> jwtFromHeader = defaultExtractor.apply(requestContext, dittoHeaders);
final Optional<JsonWebToken> jwtFromParameter = extractJwtFromParameter(requestContext);
if (jwtFromHeader.isPresent() && jwtFromParameter.isPresent()) {
throw buildMultipleJwtException(dittoHeaders);
}
return jwtFromHeader.or(() -> jwtFromParameter);
}
private Optional<JsonWebToken> extractJwtFromParameter(final RequestContext requestContext) {
return requestContext
.getRequest()
.getUri()
.query()
.get(ACCESS_TOKEN_PARAM)
.map(ImmutableJsonWebToken::fromToken);
}
@Override
public boolean isApplicable(final RequestContext requestContext) {
return defaultExtractor.isApplicable(requestContext) ||
HttpUtils.containsQueryParameter(requestContext, ACCESS_TOKEN_PARAM);
}
@Override
public String getErrorDescription() {
return "Please provide a valid JWT in the 'Authorization' header prefixed with 'Bearer ' or as query parameter" +
" 'access_token'.";
}
private DittoRuntimeException buildMultipleJwtException(final DittoHeaders dittoHeaders) {
return GatewayAuthenticationFailedException
.newBuilder("Multiple JWTs provided.")
.description(
"A JWT was provided both as a header and as query parameter. Only a single JWT is expected.")
.dittoHeaders(dittoHeaders)
.build();
}
}