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/*-
* ============LICENSE_START=======================================================
* ECOMP-PDP-REST
* ================================================================================
* 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.openecomp.policy.pdp.rest.impl;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.openecomp.policy.xacml.api.XACMLErrorConstants;
import com.att.research.xacml.std.StdStatusCode;
import com.att.research.xacml.std.dom.DOMStructureException;
import com.att.research.xacml.util.FactoryException;
import com.att.research.xacml.util.XACMLProperties;
import com.att.research.xacmlatt.pdp.policy.Policy;
import com.att.research.xacmlatt.pdp.policy.PolicyDef;
import com.att.research.xacmlatt.pdp.policy.PolicyFinder;
import com.att.research.xacmlatt.pdp.policy.PolicyFinderFactory;
import com.att.research.xacmlatt.pdp.policy.dom.DOMPolicyDef;
import com.att.research.xacmlatt.pdp.std.StdPolicyFinder;
import com.google.common.base.Splitter;
public class XACMLPdpPolicyFinderFactory extends PolicyFinderFactory {
public static final String PROP_FILE = ".file";
public static final String PROP_URL = ".url";
private static Log logger = LogFactory.getLog(XACMLPdpPolicyFinderFactory.class);
private List<PolicyDef> rootPolicies;
private List<PolicyDef> referencedPolicies;
private boolean needsInit = true;
private Properties properties = null;
public XACMLPdpPolicyFinderFactory() {
//
// Here we differ from the StdPolicyFinderFactory in that we initialize right away.
// We do not wait for a policy request to happen to look for and load policies.
//
this.init();
}
public XACMLPdpPolicyFinderFactory(Properties properties) {
//
// Save our properties
//
this.properties = properties;
//
// Here we differ from the StdPolicyFinderFactory in that we initialize right away.
// We do not wait for a policy request to happen to look for and load policies.
//
this.init();
}
/**
* Loads the <code>PolicyDef</code> for the given <code>String</code> identifier by looking first
* for a ".file" property associated with the ID and using that to load from a <code>File</code> and
* looking for a ".url" property associated with the ID and using that to load from a <code>URL</code>.
*
* @param policyId the <code>String</code> identifier for the policy
* @return a <code>PolicyDef</code> loaded from the given identifier
*/
protected PolicyDef loadPolicyDef(String policyId) {
String propLocation = null;
if (this.properties == null) {
propLocation = XACMLProperties.getProperty(policyId + PROP_FILE);
} else {
propLocation = this.properties.getProperty(policyId + PROP_FILE);
}
if (propLocation != null) {
File fileLocation = new File(propLocation);
if (!fileLocation.exists()) {
XACMLPdpPolicyFinderFactory.logger.error("Policy file " + fileLocation.getAbsolutePath() + " does not exist.");
} else if (!fileLocation.canRead()) {
XACMLPdpPolicyFinderFactory.logger.error("Policy file " + fileLocation.getAbsolutePath() + " cannot be read.");
} else {
try {
XACMLPdpPolicyFinderFactory.logger.info("Loading policy file " + fileLocation);
PolicyDef policyDef = DOMPolicyDef.load(fileLocation);
if (policyDef != null) {
return policyDef;
}
} catch (DOMStructureException ex) {
XACMLPdpPolicyFinderFactory.logger.error( XACMLErrorConstants.ERROR_SYSTEM_ERROR + "Error loading policy file " + fileLocation.getAbsolutePath() + ": " + ex.getMessage(), ex);
return new Policy(StdStatusCode.STATUS_CODE_SYNTAX_ERROR, ex.getMessage());
}
}
}
if (this.properties == null) {
propLocation = XACMLProperties.getProperty(policyId + PROP_URL);
} else {
propLocation = this.properties.getProperty(policyId + PROP_URL);
}
if (propLocation != null) {
InputStream is = null;
try {
URL url = new URL(propLocation);
URLConnection urlConnection = url.openConnection();
XACMLPdpPolicyFinderFactory.logger.info("Loading policy file " + url.toString());
is = urlConnection.getInputStream();
PolicyDef policyDef = DOMPolicyDef.load(is);
if (policyDef != null) {
return policyDef;
}
} catch (MalformedURLException ex) {
XACMLPdpPolicyFinderFactory.logger.error(XACMLErrorConstants.ERROR_SYSTEM_ERROR + "Invalid URL " + propLocation + ": " + ex.getMessage(), ex);
} catch (IOException ex) {
XACMLPdpPolicyFinderFactory.logger.error(XACMLErrorConstants.ERROR_SYSTEM_ERROR + "IOException opening URL " + propLocation + ": " + ex.getMessage(), ex);
} catch (DOMStructureException ex) {
XACMLPdpPolicyFinderFactory.logger.error(XACMLErrorConstants.ERROR_SYSTEM_ERROR + "Invalid Policy " + propLocation + ": " + ex.getMessage(), ex);
return new Policy(StdStatusCode.STATUS_CODE_SYNTAX_ERROR, ex.getMessage());
} finally {
if (is != null) {
try {
is.close();
} catch (IOException e) {
XACMLPdpPolicyFinderFactory.logger.error(XACMLErrorConstants.ERROR_SYSTEM_ERROR + "Exception closing InputStream for GET of url " + propLocation + " : " + e.getMessage() + " (May be memory leak)", e);
}
}
}
}
XACMLPdpPolicyFinderFactory.logger.error(XACMLErrorConstants.ERROR_SYSTEM_ERROR +"No known location for Policy " + policyId);
return null;
}
/**
* Finds the identifiers for all of the policies referenced by the given property name in the
* <code>XACMLProperties</code> and loads them using the requested loading method.
*
* @param propertyName the <code>String</code> name of the property containing the list of policy identifiers
* @return a <code>List</code> of <code>PolicyDef</code>s loaded from the given property name
*/
protected List<PolicyDef> getPolicyDefs(String propertyName) {
String policyIds = XACMLProperties.getProperty(propertyName);
if (policyIds == null || policyIds.length() == 0) {
return null;
}
Iterable<String> policyIdArray = Splitter.on(',').trimResults().omitEmptyStrings().split(policyIds);
if (policyIdArray == null) {
return null;
}
List<PolicyDef> listPolicyDefs = new ArrayList<PolicyDef>();
for (String policyId : policyIdArray) {
PolicyDef policyDef = this.loadPolicyDef(policyId);
if (policyDef != null) {
listPolicyDefs.add(policyDef);
}
}
return listPolicyDefs;
}
protected synchronized void init() {
if (this.needsInit) {
if (XACMLPdpPolicyFinderFactory.logger.isDebugEnabled()) {
XACMLPdpPolicyFinderFactory.logger.debug("Initializing");
}
this.rootPolicies = this.getPolicyDefs(XACMLProperties.PROP_ROOTPOLICIES);
this.referencedPolicies = this.getPolicyDefs(XACMLProperties.PROP_REFERENCEDPOLICIES);
if (XACMLPdpPolicyFinderFactory.logger.isDebugEnabled()) {
XACMLPdpPolicyFinderFactory.logger.debug("Root Policies: " + this.rootPolicies);
XACMLPdpPolicyFinderFactory.logger.debug("Referenced Policies: " + this.referencedPolicies);
}
this.needsInit = false;
}
}
@Override
public PolicyFinder getPolicyFinder() throws FactoryException {
//
// Force using any properties that were passed upon construction
//
return new StdPolicyFinder(this.rootPolicies, this.referencedPolicies, this.properties);
}
@Override
public PolicyFinder getPolicyFinder(Properties properties) throws FactoryException {
return new StdPolicyFinder(this.rootPolicies, this.referencedPolicies, properties);
}
}
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