/
SubjectIdReplacementDefinition.java
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/
SubjectIdReplacementDefinition.java
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/*
* Copyright (c) 2017 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.services.concierge.enforcement.placeholders;
import static java.util.Objects.requireNonNull;
import java.util.function.Function;
import org.eclipse.ditto.model.base.auth.AuthorizationSubject;
import org.eclipse.ditto.model.base.headers.DittoHeaders;
/**
* Replaces the placeholder {@link #REPLACER_NAME} with the first AuthorizationSubject in the headers'
* AuthorizationContext.
*/
final class SubjectIdReplacementDefinition implements Function<DittoHeaders, String> {
/**
* The name of the replacer.
*/
static final String REPLACER_NAME = "request:subjectId";
static final String LEGACY_REPLACER_NAME = "request.subjectId";
private static final SubjectIdReplacementDefinition INSTANCE = new SubjectIdReplacementDefinition();
private SubjectIdReplacementDefinition() {
// no-op
}
/**
* Returns the single instance of this function.
*
* @return the instance.
*/
public static SubjectIdReplacementDefinition getInstance() {
return INSTANCE;
}
@Override
public String apply(final DittoHeaders dittoHeaders) {
requireNonNull(dittoHeaders);
return dittoHeaders.getAuthorizationContext().getFirstAuthorizationSubject()
.map(AuthorizationSubject::getId)
.orElseThrow(() -> new IllegalStateException("AuthorizationContext must be available when this " +
"function is applied!"));
}
}