com.sap.cloud.security.ams.factory.TestServerPolicyDecisionPointFactory Maven / Gradle / Ivy

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Testing Utilities for applications using SAP Authorization Management Service (AMS) and it's client libraries
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/************************************************************************
* © 2019-2023 SAP SE or an SAP affiliate company. All rights reserved. *
************************************************************************/
package com.sap.cloud.security.ams.factory;

import com.sap.cloud.security.ams.dcl.client.pdp.PolicyDecisionPoint;
import com.sap.cloud.security.ams.dcl.client.pdp.PolicyDecisionPointFactory;
import com.sap.cloud.security.ams.logging.PolicyEvaluationSlf4jLogger;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.IOException;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;

/**
 * This shall be called with {@code PolicyDecisionPoint.create(DEFAULT)} or
 * {@code PolicyDecisionPoint.create(TEST_SERVER)}. It has to be registered as
 * service to
 * {@code META-INF.services/com.sap.cloud.security.ams.dcl.client.pdp.PolicyDecisionPointFactory}.
 */
public class TestServerPolicyDecisionPointFactory extends PolicyDecisionPointFactory {
	public static final String DEFAULT = "default";
	public static final String TEST_SERVER = "test-server";

	private static final Logger LOGGER = LoggerFactory.getLogger(TestServerPolicyDecisionPointFactory.class);
	/**
	 * The output location can be overwritten to support setups, where the compiled
	 * results are located project specific. Also other build infrastructures (e.g.
	 * gradle) can be integrated.
	 */
	static final String DCL_DEFAULT_LOCATION_PROPERTY = "sap.security.authorization.dcl.test-sources";
	/**
	 * Default output location for maven builds.
	 */
	static final String DCL_DEFAULT_LOCATION = "target" + File.separatorChar + "dcl_opa";
	private static final String DCL_RUNTIME_SERVER = "server:opa";
	private static final Map CACHE = new ConcurrentHashMap<>();
	private static final int PRIORITY = 90;

	@Override
	protected PolicyDecisionPoint tryCreate(String kind, Object[] arguments) throws IOException {
		if (DEFAULT.equalsIgnoreCase(kind) || TEST_SERVER.equalsIgnoreCase(kind)) {
			Object[] extArguments = Arrays.copyOf(arguments, arguments.length + 2);
			extArguments[arguments.length] = "sources";
			extArguments[arguments.length + 1] = getDclSourcesLocation();
			return getOrCreate(DCL_RUNTIME_SERVER, extArguments);
		}
		return null; // can not handle this kind
	}

	@Override
	protected int getPriority() {
		return PRIORITY; // Overwrites the DEFAULT of AmsPolicyDecisionPointFactory by priority
	}

	PolicyDecisionPoint getOrCreate(String kind, Object[] arguments) {
		String key = kind + Arrays.toString(arguments);
		PolicyDecisionPoint pdp = CACHE.get(key);
		if (Objects.isNull(pdp) || pdp.isClosed()) {
			synchronized (CACHE) {
				pdp = CACHE.get(key);
				if (Objects.isNull(pdp) || pdp.isClosed()) {
					LOGGER.debug("instantiate PolicyDecisionPoint for kind {} and args {}.", DCL_RUNTIME_SERVER,
							arguments);
					pdp = PolicyDecisionPoint.create(kind, arguments);
					pdp.registerListener(PolicyEvaluationSlf4jLogger.getInstance());
					CACHE.put(key, pdp);
				}
			}
		}
		return pdp;
	}

	File getDclSourcesLocation() throws IOException {
		File file = new File(readDclLocationSystemProperty()).getCanonicalFile();

		if (!file.isDirectory()) {
			String message = "PolicyDecisionPoint instantiation failed due to erroneous dcl source folder '"
					+ file + "'. Cannot start DCL runtime.";
			LOGGER.error(message);
			throw new IllegalStateException(message);
		}
		LOGGER.debug("PolicyDecisionPoint gets initialized with files from {}", file);
		return file;
	}

	String readDclLocationSystemProperty() {
		return System.getProperty(DCL_DEFAULT_LOCATION_PROPERTY, DCL_DEFAULT_LOCATION).trim();
	}

}