com.sap.cloud.security.ams.logging.PolicyEvaluationSlf4jLogger Maven / Gradle / Ivy

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/************************************************************************
 * © 2019-2023 SAP SE or an SAP affiliate company. All rights reserved. *
 ************************************************************************/
package com.sap.cloud.security.ams.logging;

import com.sap.cloud.security.ams.dcl.client.pdp.PolicyEvaluationResult;
import com.sap.cloud.security.ams.dcl.client.pdp.PolicyEvaluationResultSerializer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.function.BiConsumer;
import java.util.function.Consumer;

import static com.sap.cloud.security.ams.dcl.client.pdp.PolicyEvaluationKind.TECHNICAL;

/**
 * This logger is by default active and logs the policy evaluation result using
 * SLF4J logger.
 */
public class PolicyEvaluationSlf4jLogger implements Consumer {
	protected static final Logger LOGGER = LoggerFactory.getLogger(PolicyEvaluationSlf4jLogger.class);
	private final static PolicyEvaluationSlf4jLogger instance = new PolicyEvaluationSlf4jLogger();

	private PolicyEvaluationSlf4jLogger() {
		// use getInstance() instead
	}

	public static Consumer getInstance() {
		return instance;
	}

	/**
	 * Is always called when the
	 * {@link com.sap.cloud.security.ams.dcl.client.pdp.PolicyDecisionPoint} returns
	 * with a result.
	 *
	 * @param result
	 *            the result of the policy evaluation containing both, the input and
	 *            decision
	 */
	@Override
	public void accept(PolicyEvaluationResult result) {
		switch (result.getResultType()) {
		case ERROR:
			LOGGER.error("Policy evaluation result: {}.", stringifyResult(result));
			break;
		case DENY:
			LOGGER.warn("Policy evaluation result: {}.", stringifyResult(result));
			break;
		default:
			if (result.getKind().equals(TECHNICAL)) {
				return;
			}
			LOGGER.info("Policy evaluation result: {}.", stringifyResult(result));
		}
	}

	private String stringifyResult(PolicyEvaluationResult result) {
		final StringBuilder serializedResult = new StringBuilder(256).append("{");
		BiConsumer fillSerializedResult = (key, value) -> {
			serializedResult.append("\"");
			serializedResult.append(key);
			serializedResult.append("\":\"");
			serializedResult.append(value);
			serializedResult.append("\",");
		};
		PolicyEvaluationResultSerializer.getInstance().process(result, fillSerializedResult);
		int index = serializedResult.lastIndexOf(",");
		if (index != -1) {
			serializedResult.deleteCharAt(index);
		}
		return serializedResult.append("}").toString();
	}

}