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DittoHeadersValidator.java
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DittoHeadersValidator.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 org.eclipse.ditto.base.model.headers.DittoHeaders;
import org.eclipse.ditto.internal.utils.extension.DittoExtensionIds;
import org.eclipse.ditto.internal.utils.extension.DittoExtensionPoint;
import akka.actor.ActorSystem;
import com.typesafe.config.Config;
/**
* This extension allows to validate {@link org.eclipse.ditto.base.model.headers.DittoHeaders}.
*/
public interface DittoHeadersValidator extends DittoExtensionPoint {
/**
* Validates {@code dittoHeaders} against limits defined in the extension configuration.
*
* @param dittoHeaders the headers to validate.
* @throws org.eclipse.ditto.base.model.exceptions.DittoHeadersTooLargeException if {@code dittoHeaders} are not valid.
*/
void validate(DittoHeaders dittoHeaders);
/**
* Truncates {@code dittoHeaders} to validate against the configured limits.
*
* @param dittoHeaders the headers to truncate.
* @return the truncated headers.
*/
DittoHeaders truncate(DittoHeaders dittoHeaders);
/**
* Loads the implementation of {@code DittoHeadersValidator} which is configured for the
* {@code ActorSystem}.
*
* @param actorSystem the actorSystem in which the {@code DittoHeadersValidator} should be loaded.
* @param config the configuration for this extension.
* @return the {@code DittoHeadersValidator} implementation.
* @throws NullPointerException if {@code actorSystem} is {@code null}.
*/
static DittoHeadersValidator get(final ActorSystem actorSystem, final Config config) {
checkNotNull(actorSystem, "actorSystem");
final var extensionIdConfig = DittoHeadersValidator.ExtensionId.computeConfig(config);
return DittoExtensionIds.get(actorSystem)
.computeIfAbsent(extensionIdConfig, DittoHeadersValidator.ExtensionId::new)
.get(actorSystem);
}
final class ExtensionId extends DittoExtensionPoint.ExtensionId<DittoHeadersValidator> {
private static final String CONFIG_KEY = "ditto-headers-validator-provider";
private ExtensionId(final ExtensionIdConfig<DittoHeadersValidator> extensionIdConfig) {
super(extensionIdConfig);
}
static ExtensionIdConfig<DittoHeadersValidator> computeConfig(final Config config) {
return ExtensionIdConfig.of(DittoHeadersValidator.class, config, CONFIG_KEY);
}
@Override
protected String getConfigKey() {
return CONFIG_KEY;
}
}
}