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/*-
* ============LICENSE_START=======================================================
* guard
* ================================================================================
* Copyright (C) 2017 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.guard;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Iterator;
import java.util.UUID;
import org.apache.commons.io.IOUtils;
import org.apache.http.entity.ContentType;
import com.att.research.xacml.api.Attribute;
import com.att.research.xacml.api.AttributeCategory;
import com.att.research.xacml.api.AttributeValue;
import com.att.research.xacml.api.Result;
import com.att.research.xacml.api.pdp.PDPEngine;
import com.att.research.xacml.api.pdp.PDPException;
import com.att.research.xacml.std.dom.DOMResponse;
import com.att.research.xacml.std.json.JSONRequest;
import com.att.research.xacml.std.json.JSONResponse;
public class PolicyGuardXacmlHelper {
public static com.att.research.xacml.api.Response callPDP(PDPEngine xacmlEmbeddedPdpEngine, String restfulPdpUrl, com.att.research.xacml.api.Request request, boolean isREST) {
//
// Send it to the PDP
//
com.att.research.xacml.api.Response response = null;
if (isREST) {
try {
String jsonString = JSONRequest.toString((com.att.research.xacml.api.Request) request, false);
//
// Call RESTful PDP
//
response = (com.att.research.xacml.api.Response) callRESTfulPDP(new ByteArrayInputStream(jsonString.getBytes()), new URL(restfulPdpUrl/*"https://localhost:8443/pdp/"*/));
} catch (Exception e) {
System.err.println("Error in sending RESTful request: " + e);
}
} else if(xacmlEmbeddedPdpEngine != null){
//
// Embedded call to PDP
//
long lTimeStart = System.currentTimeMillis();
try {
response = (com.att.research.xacml.api.Response) xacmlEmbeddedPdpEngine.decide((com.att.research.xacml.api.Request) request);
} catch (PDPException e) {
System.err.println(e);
}
long lTimeEnd = System.currentTimeMillis();
System.out.println("Elapsed Time: " + (lTimeEnd - lTimeStart) + "ms");
}
return response;
}
/**
* This makes an HTTP POST call to a running PDP RESTful servlet to get a decision.
*
* @param file
* @return
*/
private static com.att.research.xacml.api.Response callRESTfulPDP(InputStream is, URL restURL) {
com.att.research.xacml.api.Response response = null;
HttpURLConnection connection = null;
try {
//
// Open up the connection
//
connection = (HttpURLConnection) restURL.openConnection();
connection.setRequestProperty("Content-Type", "application/json");
//
// Setup our method and headers
//
connection.setRequestMethod("POST");
connection.setUseCaches(false);
//
// Adding this in. It seems the HttpUrlConnection class does NOT
// properly forward our headers for POST re-direction. It does so
// for a GET re-direction.
//
// So we need to handle this ourselves.
//
connection.setInstanceFollowRedirects(false);
connection.setDoOutput(true);
connection.setDoInput(true);
//
// Send the request
//
try (OutputStream os = connection.getOutputStream()) {
IOUtils.copy(is, os);
}
//
// Do the connect
//
connection.connect();
if (connection.getResponseCode() == 200) {
//
// Read the response
//
ContentType contentType = null;
try {
contentType = ContentType.parse(connection.getContentType());
if (contentType.getMimeType().equalsIgnoreCase(ContentType.APPLICATION_JSON.getMimeType())) {
response = (com.att.research.xacml.api.Response) JSONResponse.load(connection.getInputStream());
} else if (contentType.getMimeType().equalsIgnoreCase(ContentType.APPLICATION_XML.getMimeType()) ||
contentType.getMimeType().equalsIgnoreCase("application/xacml+xml") ) {
response = (com.att.research.xacml.api.Response) DOMResponse.load(connection.getInputStream());
} else {
System.err.println("unknown content-type: " + contentType);
}
} catch (Exception e) {
String message = "Parsing Content-Type: " + connection.getContentType() + ", error=" + e.getMessage();
System.err.println(message);
}
} else {
System.err.println(connection.getResponseCode() + " " + connection.getResponseMessage());
}
} catch (Exception e) {
System.err.println(e);
}
return response;
}
public static PolicyGuardResponse ParseXacmlPdpResponse(com.att.research.xacml.api.Response xacmlResponse){
if(xacmlResponse == null){
//
//In case the actual XACML response was null, create an empty response object with decision "Indeterminate"
//
return new PolicyGuardResponse("Indeterminate", null, "");
}
Iterator<Result> it_res = xacmlResponse.getResults().iterator();
Result res = it_res.next();
String decision_from_xacml_response = res.getDecision().toString();
Iterator<AttributeCategory> it_attr_cat = res.getAttributes().iterator();
UUID req_id_from_xacml_response = null;
String operation_from_xacml_response = "";
while(it_attr_cat.hasNext()){
Iterator<Attribute> it_attr = it_attr_cat.next().getAttributes().iterator();
while(it_attr.hasNext()){
Attribute current_attr = it_attr.next();
String s = current_attr.getAttributeId().stringValue();
//System.out.println("ATTR ID = " + s);
if(s.equals("urn:oasis:names:tc:xacml:1.0:request:request-id")){
Iterator<AttributeValue<?>> it_values = current_attr.getValues().iterator();
req_id_from_xacml_response = UUID.fromString(it_values.next().getValue().toString());
//System.out.println("UUID = " + req_id_from_xacml_response);
}
if(s.equals("urn:oasis:names:tc:xacml:1.0:operation:operation-id")){
Iterator<AttributeValue<?>> it_values = current_attr.getValues().iterator();
operation_from_xacml_response = it_values.next().getValue().toString();
//System.out.println("OPERATION = " + operation_from_xacml_response);
}
}
}
return new PolicyGuardResponse(decision_from_xacml_response, req_id_from_xacml_response, operation_from_xacml_response);
}
}
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