Build XACML PDP support for native xacml policy type

Added a new native application to the service loader framework
Added a new translator for the native application
Added custom serialization providers for xacml+json and xacml+xml
Added a new endpoint for native xacml decision api
Added a new api provider function to handle the native xacml api calls
Added corresponding junit tests

Issue-ID: POLICY-2182
Change-Id: I30fa4637612c324d543f9952386cf1a27a52d76c
Signed-off-by: Chenfei Gao <cgao@research.att.com>

3 files changed, 191 insertions, 0 deletions

diff --git a/applications/native/src/main/java/org/onap/policy/xacml/pdp/application/nativ/NativePdpApplication.java b/applications/native/src/main/java/org/onap/policy/xacml/pdp/application/nativ/NativePdpApplication.java
new file mode 100644
index 00000000..0d862d11
--- /dev/null
+++ b/applications/native/src/main/java/org/onap/policy/xacml/pdp/application/nativ/NativePdpApplication.java
@@ -0,0 +1,78 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2020 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.xacml.pdp.application.nativ;
+
+import com.att.research.xacml.api.Request;
+import com.att.research.xacml.api.Response;
+import java.util.Arrays;
+import java.util.List;
+import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicyTypeIdentifier;
+import org.onap.policy.pdp.xacml.application.common.ToscaPolicyTranslator;
+import org.onap.policy.pdp.xacml.application.common.std.StdXacmlApplicationServiceProvider;
+
+/**
+ * This class implements an application that handles onap.policies.native.Xacml policies.
+ *
+ * @author Chenfei Gao (cgao@research.att.com)
+ *
+ */
+public class NativePdpApplication extends StdXacmlApplicationServiceProvider {
+
+    private static final ToscaPolicyTypeIdentifier supportedPolicyType = new ToscaPolicyTypeIdentifier(
+            "onap.policies.native.Xacml", "1.0.0");
+    private NativePdpApplicationTranslator translator = new NativePdpApplicationTranslator();
+
+    @Override
+    public String applicationName() {
+        return "native";
+    }
+
+    @Override
+    public List<String> actionDecisionsSupported() {
+        return Arrays.asList("native");
+    }
+
+    @Override
+    public synchronized List<ToscaPolicyTypeIdentifier> supportedPolicyTypes() {
+        return Arrays.asList(supportedPolicyType);
+    }
+
+    @Override
+    public boolean canSupportPolicyType(ToscaPolicyTypeIdentifier policyTypeId) {
+        return supportedPolicyType.equals(policyTypeId);
+    }
+
+    @Override
+    protected ToscaPolicyTranslator getTranslator(String type) {
+        return translator;
+    }
+
+    /**
+     * Makes decision for the incoming native xacml request.
+     * @param request the native xacml request
+     * @return the native xacml response
+     */
+    public Response makeNativeDecision(Request request) {
+        return this.xacmlDecision(request);
+    }
+}
diff --git a/applications/native/src/main/java/org/onap/policy/xacml/pdp/application/nativ/NativePdpApplicationTranslator.java b/applications/native/src/main/java/org/onap/policy/xacml/pdp/application/nativ/NativePdpApplicationTranslator.java
new file mode 100644
index 00000000..98a1c657
--- /dev/null
+++ b/applications/native/src/main/java/org/onap/policy/xacml/pdp/application/nativ/NativePdpApplicationTranslator.java
@@ -0,0 +1,112 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2020 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.xacml.pdp.application.nativ;
+
+import com.att.research.xacml.api.Request;
+import com.att.research.xacml.api.Response;
+import com.att.research.xacml.util.XACMLPolicyScanner;
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+import java.util.Base64;
+import java.util.Map;
+import oasis.names.tc.xacml._3_0.core.schema.wd_17.PolicyType;
+import org.onap.policy.models.decisions.concepts.DecisionRequest;
+import org.onap.policy.models.decisions.concepts.DecisionResponse;
+import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicy;
+import org.onap.policy.pdp.xacml.application.common.ToscaPolicyConversionException;
+import org.onap.policy.pdp.xacml.application.common.ToscaPolicyTranslator;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * This class implements one translator that interprets TOSCA policy and decision API request/response payload.
+ *
+ * @author Chenfei Gao (cgao@research.att.com)
+ *
+ */
+public class NativePdpApplicationTranslator implements ToscaPolicyTranslator {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(NativePdpApplicationTranslator.class);
+    private static final String POLICY = "policy";
+
+    public NativePdpApplicationTranslator() {
+        super();
+    }
+
+    @Override
+    public PolicyType convertPolicy(ToscaPolicy toscaPolicy) throws ToscaPolicyConversionException {
+        //
+        // Extract the Base64 encoded policy xml string and decode it
+        //
+        String encodedXacmlPolicy = getNativeXacmlPolicy(toscaPolicy);
+        String decodedXacmlPolicy;
+        try {
+            decodedXacmlPolicy = new String(Base64.getDecoder().decode(encodedXacmlPolicy), StandardCharsets.UTF_8);
+        } catch (IllegalArgumentException exc) {
+            throw new ToscaPolicyConversionException("error on Base64 decoding the native policy", exc);
+        }
+        LOGGER.debug("Decoded xacml policy {}",decodedXacmlPolicy);
+        //
+        // Scan the string and convert to xacml PolicyType
+        //
+        try (InputStream is = new ByteArrayInputStream(decodedXacmlPolicy.getBytes(StandardCharsets.UTF_8))) {
+            //
+            // Here we assume it is PolicyType, not PolicySetType
+            // PolicySetType will be addressed later
+            //
+            return (PolicyType) XACMLPolicyScanner.readPolicy(is);
+        } catch (IOException exc) {
+            throw new ToscaPolicyConversionException("Failed to read policy", exc);
+        }
+    }
+
+    private String getNativeXacmlPolicy(ToscaPolicy toscaPolicy) throws ToscaPolicyConversionException {
+
+        Map<String, Object> propertyMap = toscaPolicy.getProperties();
+        if (propertyMap.isEmpty() || !propertyMap.containsKey(POLICY)) {
+            throw new ToscaPolicyConversionException("no xacml native policy found in the tosca policy");
+        }
+
+        String nativePolicyString = propertyMap.get(POLICY).toString();
+        LOGGER.debug("Base64 encoded native xacml policy {}", nativePolicyString);
+        return nativePolicyString;
+    }
+
+    @Override
+    public Request convertRequest(DecisionRequest request) {
+        //
+        // We do nothing to DecisionRequest for native xacml application
+        //
+        return null;
+    }
+
+    @Override
+    public DecisionResponse convertResponse(Response xacmlResponse) {
+        //
+        // We do nothing to DecisionResponse for native xacml application
+        //
+        return null;
+    }
+}
\ No newline at end of file
diff --git a/applications/native/src/main/resources/META-INF/services/org.onap.policy.pdp.xacml.application.common.XacmlApplicationServiceProvider b/applications/native/src/main/resources/META-INF/services/org.onap.policy.pdp.xacml.application.common.XacmlApplicationServiceProvider
new file mode 100644
index 00000000..480ad05a
--- /dev/null
+++ b/applications/native/src/main/resources/META-INF/services/org.onap.policy.pdp.xacml.application.common.XacmlApplicationServiceProvider
@@ -0,0 +1 @@
+org.onap.policy.xacml.pdp.application.nativ.NativePdpApplication
\ No newline at end of file