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DefaultDittoHeadersValidator.java
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DefaultDittoHeadersValidator.java
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/*
* Copyright (c) 2022 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.edge.service.headers;
import static org.eclipse.ditto.base.model.common.ConditionChecker.checkNotNull;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionStage;
import javax.annotation.concurrent.Immutable;
import org.eclipse.ditto.base.model.exceptions.DittoHeadersTooLargeException;
import org.eclipse.ditto.base.model.headers.DittoHeaders;
import com.typesafe.config.Config;
import org.apache.pekko.actor.ActorSystem;
/**
* Default implementation for {@link DittoHeadersValidator}.
*/
@Immutable
public final class DefaultDittoHeadersValidator implements DittoHeadersValidator {
private static final String MAX_BYTES = "max-bytes";
private static final String MAX_AUTH_SUBJECTS = "max-auth-subjects";
private final long maxBytes;
private final int maxAuthSubjects;
@SuppressWarnings("unused")
public DefaultDittoHeadersValidator(final ActorSystem actorSystem, final Config config) {
maxBytes = config.getBytes(MAX_BYTES);
maxAuthSubjects = config.getInt(MAX_AUTH_SUBJECTS);
}
@Override
public CompletionStage<DittoHeaders> validate(DittoHeaders dittoHeaders) {
checkNotNull(dittoHeaders, "dittoHeaders");
return validateSize(dittoHeaders).thenCompose(this::validateAuthorizationContext);
}
/**
* Validates {@code dittoHeaders} against {@code maximum-size} defined in the extension configuration.
*
* @param dittoHeaders the headers to validate.
* @return a completion stage which completes successfully with the valid headers. Raises a
* {@link org.eclipse.ditto.base.model.exceptions.DittoHeadersTooLargeException} if {@code dittoHeaders} are not
* valid.
*/
public CompletionStage<DittoHeaders> validateSize(final DittoHeaders dittoHeaders) {
if (dittoHeaders.isEntriesSizeGreaterThan(maxBytes)) {
return CompletableFuture.failedStage(DittoHeadersTooLargeException.newSizeLimitBuilder(maxBytes)
.dittoHeaders(dittoHeaders)
.build());
}
return CompletableFuture.completedStage(dittoHeaders);
}
private CompletionStage<DittoHeaders> validateAuthorizationContext(final DittoHeaders dittoHeaders) {
final int authSubjectsCount = dittoHeaders.getAuthorizationContext().getSize();
if (authSubjectsCount > maxAuthSubjects) {
return CompletableFuture.failedStage(
DittoHeadersTooLargeException.newAuthSubjectsLimitBuilder(authSubjectsCount, maxAuthSubjects)
.dittoHeaders(dittoHeaders)
.build());
}
return CompletableFuture.completedStage(dittoHeaders);
}
@Override
public DittoHeaders truncate(DittoHeaders dittoHeaders) {
return dittoHeaders.truncate(maxBytes);
}
}