Instruction:
作为 Java 安全专家，检测此代码中的安全漏洞：
## 内容1
### 文件路径：
org.talend.mdm.commons.core/src/com/amalto/commons/core/utils/XMLUtils.java
### 代码内容：
package com.amalto.commons.core.utils;

import java.io.StringReader;
import java.io.StringWriter;

import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.dom4j.io.DocumentResult;
import org.dom4j.io.DocumentSource;
import org.w3c.dom.DOMImplementation;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import com.sun.org.apache.xpath.internal.XPathAPI;
import com.sun.org.apache.xpath.internal.objects.XObject;

/**
 * XML Manipulation routines
 * @author Bruno Grieder
 *
 */
public final class XMLUtils {

    private static final Logger logger = LogManager.getLogger(XMLUtils.class);

    private static final TransformerFactory transformerFactory;

    private static final TransformerFactory saxonTransformerFactory = new net.sf.saxon.TransformerFactoryImpl();

    static {
        // the open jdk implementation allows the disabling of the feature used for XXE
        System.setProperty("javax.xml.transform.TransformerFactory",
                "com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl");
        transformerFactory = TransformerFactory.newInstance();
        try {
            transformerFactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
            transformerFactory.setAttribute(XMLConstants.ACCESS_EXTERNAL_DTD, "");
            transformerFactory.setAttribute(XMLConstants.ACCESS_EXTERNAL_STYLESHEET, "");

            saxonTransformerFactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
            saxonTransformerFactory.setAttribute("http://saxon.sf.net/feature/version-warning", Boolean.FALSE);
            saxonTransformerFactory.setAttribute("http://saxon.sf.net/feature/allow-external-functions", Boolean.FALSE);
            saxonTransformerFactory.setAttribute("http://saxon.sf.net/feature/trace-external-functions", Boolean.FALSE);
        } catch (TransformerConfigurationException e) {
            // Just catch this, as Xalan doesn't support the above
        }
    }

    /**
	 * Returns a namespaced root element of a document
	 * Useful to create a namespace holder element
	 * @param namespace
	 * @return the root Element
	 */
	public static Element getRootElement(String elementName, String namespace, String prefix) throws TransformerException{
	 	Element rootNS=null;
    	try {
	    	DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
	        factory.setNamespaceAware(true);
	        factory.setExpandEntityReferences(false);
	        DocumentBuilder builder = factory.newDocumentBuilder();
	    	DOMImplementation impl = builder.getDOMImplementation();
	    	Document namespaceHolder = impl.createDocument(namespace,(prefix==null?"":prefix+":")+elementName, null);
	    	rootNS = namespaceHolder.getDocumentElement();
	    	rootNS.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:"+prefix, namespace);
    	} catch (Exception e) {
    	    String err="Error creating a namespace holder document: "+e.getLocalizedMessage();
    	    throw new TransformerException(err);
    	}
    	return rootNS;
	}

	/**
	 * Get a nodelist from an xPath
	 * @throws TransformerException
	 */
	public static NodeList getNodeList(Document d, String xPath) throws TransformerException{
		return getNodeList(d.getDocumentElement(),xPath,null,null);
	}
	/**
	 * Get a nodelist from an xPath
	 * @throws TransformerException
	 */
	public static NodeList getNodeList(Node contextNode, String xPath) throws TransformerException{
		return getNodeList(contextNode,xPath,null,null);
	}

	/**
	 * Get a nodelist from an xPath
	 * @throws TransformerException
	 */
	public static NodeList getNodeList(Node contextNode, String xPath, String namespace, String prefix) throws TransformerException{
		try {
		    XObject xo = XPathAPI.eval(
	    		contextNode,
				xPath,
				(namespace == null) ? contextNode : getRootElement("nsholder",namespace,prefix)
		    );
		    if (xo.getType() != XObject.CLASS_NODESET) return null;
		    return xo.nodelist();
    	} catch (TransformerException e) {
    	    String err = "Unable to get the Nodes List for xpath '"+xPath+"'"
    	    	+((contextNode==null) ? "" : " for Node "+contextNode.getLocalName())
    			+": "+e.getLocalizedMessage();
    		throw new TransformerException(err);
    	}
	}

    /**
     * Returns the first Element of the Node List at xPath
     * @param n
     * @param xPath
     * @return
     * @throws XtentisWebappException
     */
	public static Element getFirstElement(Node n, String xPath) throws TransformerException {
			NodeList nl = getNodeList(n, xPath);
			if ((nl==null) || (nl.getLength()==0)) return null;
			return (Element)nl.item(0);
	}

    public static String[] getAttributeNodeValue(Node contextNode, String xPath, Node namespaceNode) throws TransformerException{
        String[] results;

        //test for hard-coded values
        if (xPath.startsWith("\"") && xPath.endsWith("\""))
            return new String[] { xPath.substring(1, xPath.length()-1)};

        //test for incomplete path
        //if (! xPath.endsWith(")")) xPath+="/text()";

        try {
	        XObject xo = XPathAPI.eval(contextNode, xPath,namespaceNode);
	        if (xo.getType() == XObject.CLASS_NODESET) {
	            NodeList l = xo.nodelist();
	            int len = l.getLength();
	            results = new String[len];
	            for (int i = 0; i < len; i++) {
	                Node n = l.item(i);
	                results[i] = n.getNodeValue();
	            }
	        } else {
	            results = new String[]{xo.toString()};
	        }
		} catch (TransformerException e) {
			String err = "Unable to get the text node(s) of "+xPath
					+": " + e.getClass().getName() + ": "
					+ e.getLocalizedMessage();
			throw new TransformerException(err);
		}
		return results;
    }

    public static Transformer generateTransformer() throws TransformerConfigurationException {
        return transformerFactory.newTransformer();
    }

    public static Transformer generateTransformer(boolean isOmitXmlDeclaration) throws TransformerConfigurationException {
        Transformer transformer = generateTransformer();
        if (isOmitXmlDeclaration) {
            transformer.setOutputProperty("omit-xml-declaration", "yes");
        } else {
            transformer.setOutputProperty("omit-xml-declaration", "no");
        }
        return transformer;
    }

    public static Transformer generateTransformer(boolean isOmitXmlDeclaration, boolean isIndent)
            throws TransformerConfigurationException {
        Transformer transformer = generateTransformer(isOmitXmlDeclaration);
        if (isIndent) {
            transformer.setOutputProperty("indent", "yes");
        } else {
            transformer.setOutputProperty("indent", "no");
        }
        return transformer;
    }

    public static String nodeToString(Node n, boolean isOmitXmlDeclaration, boolean isIndent) throws TransformerException {
        StringWriter sw = new StringWriter();
        Transformer transformer = generateTransformer(isOmitXmlDeclaration, isIndent);
        transformer.transform(new DOMSource(n), new StreamResult(sw));
        return sw.toString();
    }

    public static String nodeToString(Node n) throws TransformerException {
        return nodeToString(n, true, true);
    }

    public static org.dom4j.Document styleDocument(org.dom4j.Document document, String stylesheet) throws Exception {
        // load the transformer using JAXP
        Transformer transformer = saxonTransformerFactory.newTransformer(new StreamSource(new StringReader(stylesheet)));

        // now lets style the given document
        DocumentSource source = new DocumentSource(document);
        DocumentResult result = new DocumentResult();
        transformer.transform(source, result);

        // return the transformed document
        org.dom4j.Document transformedDoc = result.getDocument();

        if (logger.isDebugEnabled()) {
            logger.debug("The xml file style transformed successfully ");
        }
        return transformedDoc;
    }
 }

## 内容2
### 文件路径：
org.talend.mdm.core/src/com/amalto/core/storage/SystemStorageWrapper.java
### 代码内容：
package com.amalto.core.storage;

import static com.amalto.core.query.user.UserQueryBuilder.eq;
import static com.amalto.core.query.user.UserQueryBuilder.from;

import java.io.IOException;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;

import javax.xml.parsers.DocumentBuilderFactory;

import org.apache.commons.lang.StringUtils;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.LogManager;
import org.talend.mdm.commmon.metadata.ComplexTypeMetadata;
import org.talend.mdm.commmon.metadata.ContainedComplexTypeMetadata;
import org.talend.mdm.commmon.metadata.DefaultMetadataVisitor;
import org.talend.mdm.commmon.metadata.FieldMetadata;
import org.talend.mdm.commmon.metadata.MetadataRepository;
import org.talend.mdm.commmon.metadata.MetadataVisitor;
import org.talend.mdm.commmon.metadata.TypeMetadata;
import org.talend.mdm.commmon.util.core.MDMXMLUtils;
import org.talend.mdm.commmon.util.webapp.XSystemObjects;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;

import com.amalto.core.metadata.ClassRepository;
import com.amalto.core.objects.ObjectPOJO;
import com.amalto.core.query.user.Select;
import com.amalto.core.query.user.UserQueryBuilder;
import com.amalto.core.server.StorageAdmin;
import com.amalto.core.storage.record.DataRecord;
import com.amalto.core.storage.record.DataRecordReader;
import com.amalto.core.storage.record.XmlDOMDataRecordReader;
import com.amalto.core.storage.record.XmlSAXDataRecordReader;
import com.amalto.xmlserver.interfaces.ItemPKCriteria;
import com.amalto.xmlserver.interfaces.XmlServerException;

public class SystemStorageWrapper extends StorageWrapper {

    private static final DocumentBuilderFactory DOCUMENT_BUILDER_FACTORY = DocumentBuilderFactory.newInstance();

    private static final String SYSTEM_PREFIX = "amaltoOBJECTS"; //$NON-NLS-1$

    private static final String CUSTOM_FORM_TYPE = "custom-form-pOJO"; //$NON-NLS-1$

    private static final String DROPPED_ITEM_TYPE = "dropped-item-pOJO"; //$NON-NLS-1$

    private static final String COMPLETED_ROUTING_ORDER = "completed-routing-order-v2-pOJO"; //$NON-NLS-1$

    private static final String FAILED_ROUTING_ORDER = "failed-routing-order-v2-pOJO"; //$NON-NLS-1$

    private static final String SYNCHRONIZATION_OBJECT_TYPE = "synchronization-object-pOJO"; //$NON-NLS-1$

    private static final String BROWSEITEM_PREFIX_INFO = "SearchTemplate.BrowseItem."; //$NON-NLS-1$

    private static final Logger LOGGER = LogManager.getLogger(SystemStorageWrapper.class);

    public SystemStorageWrapper() {
        DOCUMENT_BUILDER_FACTORY.setNamespaceAware(true);
        // Create "system" storage
        StorageAdmin admin = getStorageAdmin();
        if (!admin.exist(StorageAdmin.SYSTEM_STORAGE, StorageType.SYSTEM)) {
            String datasource = admin.getDatasource(StorageAdmin.SYSTEM_STORAGE);
            admin.create(StorageAdmin.SYSTEM_STORAGE, StorageAdmin.SYSTEM_STORAGE, StorageType.SYSTEM, datasource);
        }
    }

    private ComplexTypeMetadata getType(String clusterName, Storage storage, String uniqueID) {
        MetadataRepository repository = storage.getMetadataRepository();
        if (uniqueID != null && uniqueID.startsWith("amalto_local_service_")) { //$NON-NLS-1$
            return repository.getComplexType("service-bMP"); //$NON-NLS-1$
        }
        if (clusterName.startsWith(SYSTEM_PREFIX) || clusterName.startsWith("amalto")) { //$NON-NLS-1$
            if (!"amaltoOBJECTSservices".equals(clusterName)) { //$NON-NLS-1$
                return repository.getComplexType(ClassRepository.format(clusterName.substring(SYSTEM_PREFIX.length()) + "POJO")); //$NON-NLS-1$
            } else {
                return repository.getComplexType(ClassRepository.format(clusterName.substring(SYSTEM_PREFIX.length())));
            }
        }
        if (XSystemObjects.DC_MDMITEMSTRASH.getName().equals(clusterName)) {
            return repository.getComplexType(DROPPED_ITEM_TYPE);
        } else if (XSystemObjects.DC_PROVISIONING.getName().equals(clusterName)) {
            String typeName = getTypeName(uniqueID);
            if ("Role".equals(typeName)) { //$NON-NLS-1$
                return repository.getComplexType("role-pOJO"); //$NON-NLS-1$
            }
            return repository.getComplexType(typeName);
        } else if ("MDMDomainObjects".equals(clusterName) || "MDMItemImages".equals(clusterName) || "FailedAutoCommitSvnMessage".equals(clusterName)) { //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
            return null; // Documents for these clusters don't have a predefined structure.
        }
        // No id, so no type to be read.
        if (uniqueID == null) {
            return null;
        }
        // MIGRATION.completed.record
        return repository.getComplexType(getTypeName(uniqueID));
    }

    @Override
    public List<String> getItemPKsByCriteria(ItemPKCriteria criteria) throws XmlServerException {
        String clusterName = criteria.getClusterName();
        Storage storage = getStorage(clusterName);
        MetadataRepository repository = storage.getMetadataRepository();

        int totalCount = 0;
        List<String> itemPKResults = new LinkedList<String>();
        String typeName = criteria.getConceptName();

        try {
            storage.begin();
            if (typeName != null && !typeName.isEmpty()) {
                String internalTypeName = typeName;
                String objectRootElementName = ObjectPOJO.getObjectRootElementName(typeName);
                if (objectRootElementName != null) {
                    internalTypeName = objectRootElementName;
                }
                totalCount = getTypeItemCount(criteria, repository.getComplexType(internalTypeName), storage);
                itemPKResults.addAll(getTypeItems(criteria, repository.getComplexType(internalTypeName), storage, typeName));
            } else {
                // TMDM-4651: Returns type in correct dependency order.
                Collection<ComplexTypeMetadata> types = getClusterTypes(clusterName);
                int maxCount = criteria.getMaxItems();
                if (criteria.getSkip() < 0) { // MDM Studio may send negative values
                    criteria.setSkip(0);
                }
                List<String> currentInstanceResults;
                String objectRootElementName;
                for (ComplexTypeMetadata type : types) {
                    String internalTypeName = type.getName();
                    objectRootElementName = ObjectPOJO.getObjectRootElementName(internalTypeName);
                    if (objectRootElementName != null) {
                        internalTypeName = objectRootElementName;
                    }
                    int count = getTypeItemCount(criteria, repository.getComplexType(internalTypeName), storage);
                    totalCount += count;
                    if (itemPKResults.size() < maxCount) {
                        if (count > criteria.getSkip()) {
                            currentInstanceResults = getTypeItems(criteria, repository.getComplexType(internalTypeName), storage,
                                    type.getName());
                            int n = maxCount - itemPKResults.size();
                            if (n <= currentInstanceResults.size()) {
                                itemPKResults.addAll(currentInstanceResults.subList(0, n));
                            } else {
                                itemPKResults.addAll(currentInstanceResults);
                            }
                            criteria.setMaxItems(criteria.getMaxItems() - currentInstanceResults.size());
                            criteria.setSkip(0);
                        } else {
                            criteria.setSkip(criteria.getSkip() - count);
                        }
                    }
                }
            }
            itemPKResults.add(0, "<totalCount>" + totalCount + "</totalCount>"); //$NON-NLS-1$ //$NON-NLS-2$
        } finally {
            storage.commit();
        }
        return itemPKResults;
    }

    @Override
    protected Storage getStorage(String dataClusterName) {
        return storageAdmin.get(StorageAdmin.SYSTEM_STORAGE, StorageType.SYSTEM);
    }

    @Override
    public long deleteCluster(String clusterName) throws XmlServerException {
        return 0;
    }

    @Override
    public String[] getAllClusters() throws XmlServerException {
        Set<String> internalClusterNames = DispatchWrapper.getInternalClusterNames();
        return internalClusterNames.toArray(new String[internalClusterNames.size()]);
    }

    @Override
    public long deleteAllClusters() throws XmlServerException {
        return 0;
    }

    @Override
    public long createCluster(String clusterName) throws XmlServerException {
        return 0;
    }

    @Override
    public boolean existCluster(String cluster) throws XmlServerException {
        return true;
    }

    @Override
    protected Collection<ComplexTypeMetadata> getClusterTypes(String clusterName) {
        Storage storage = getStorage(clusterName);
        MetadataRepository repository = storage.getMetadataRepository();
        return filter(repository, clusterName);
    }

    public static Collection<ComplexTypeMetadata> filter(MetadataRepository repository, String clusterName) {
        if (clusterName.startsWith(SYSTEM_PREFIX) || clusterName.startsWith("amalto")) { //$NON-NLS-1$
            if (!"amaltoOBJECTSservices".equals(clusterName)) { //$NON-NLS-1$
                final String className = ClassRepository.format(clusterName.substring(SYSTEM_PREFIX.length()) + "POJO"); //$NON-NLS-1$
                return filterRepository(repository, className);
            } else {
                final String className = ClassRepository.format(clusterName.substring(SYSTEM_PREFIX.length()));
                return filterRepository(repository, className);
            }
        } else if (XSystemObjects.DC_MDMITEMSTRASH.getName().equals(clusterName)) {
            return filterRepository(repository, DROPPED_ITEM_TYPE);
        } else if (XSystemObjects.DC_CONF.getName().equals(clusterName)) {
            return filterRepository(repository, "Conf", "AutoIncrement"); //$NON-NLS-1$ //$NON-NLS-2$
        } else if (XSystemObjects.DC_CROSSREFERENCING.getName().equals(clusterName)) {
            return Collections.emptyList(); // TODO Support crossreferencing
        } else if (XSystemObjects.DC_PROVISIONING.getName().equals(clusterName)) {
            return filterRepository(repository, "User", "Role"); //$NON-NLS-1$ //$NON-NLS-2$
        } else if (XSystemObjects.DC_SEARCHTEMPLATE.getName().equals(clusterName)) {
            return filterRepository(repository, "BrowseItem", "HierarchySearchItem"); //$NON-NLS-1$ //$NON-NLS-2$
        } else {
            return repository.getUserComplexTypes();
        }
    }

    private static Collection<ComplexTypeMetadata> filterRepository(MetadataRepository repository, String... typeNames) {
        final Set<ComplexTypeMetadata> filteredTypes = new HashSet<ComplexTypeMetadata>();
        MetadataVisitor<Void> transitiveTypeClosure = new DefaultMetadataVisitor<Void>() {

            private final Set<TypeMetadata> visitedTypes = new HashSet<>();

            @Override
            public Void visit(ComplexTypeMetadata complexType) {
                if (!visitedTypes.add(complexType)) {
                    return null;
                }
                if (complexType.isInstantiable()) {
                    filteredTypes.add(complexType);
                }
                return super.visit(complexType);
            }

            @Override
            public Void visit(ContainedComplexTypeMetadata containedType) {
                if (!visitedTypes.add(containedType)) {
                    return null;
                }
                if (containedType.isInstantiable()) {
                    filteredTypes.add(containedType);
                }
                return super.visit(containedType);
            }
        };
        for (String typeName : typeNames) {
            ComplexTypeMetadata type = repository.getComplexType(typeName);
            if (type != null) {
                type.accept(transitiveTypeClosure);
            }
        }
        return filteredTypes;
    }

    @Override
    public String[] getAllDocumentsUniqueID(String clusterName) throws XmlServerException {
        String pureClusterName = getPureClusterName(clusterName);
        boolean includeClusterAndTypeName = getClusterTypes(pureClusterName).size() > 1;
        return getAllDocumentsUniqueID(clusterName, includeClusterAndTypeName, false);
    }

    @Override
    public String[] getAllDocumentsUniqueID(String clusterName, final boolean ignoreChild) throws XmlServerException {
        String pureClusterName = getPureClusterName(clusterName);
        boolean includeClusterAndTypeName = getClusterTypes(pureClusterName).size() > 1;
        return getAllDocumentsUniqueID(clusterName, includeClusterAndTypeName, ignoreChild);
    }

    @Override
    public long putDocumentFromDOM(Element root, String uniqueID, String clusterName) throws XmlServerException {
        long start = System.currentTimeMillis();
        {
            DataRecordReader<Element> reader = new XmlDOMDataRecordReader();
            Storage storage = getStorage(clusterName);
            ComplexTypeMetadata type = getType(clusterName, storage, uniqueID);
            if (type == null) {
                return -1; // TODO
            }
            MetadataRepository repository = storage.getMetadataRepository();
            DataRecord record = reader.read(repository, type, root);
            for (FieldMetadata keyField : type.getKeyFields()) {
                if (record.get(keyField) == null) {
                    LOGGER.warn("Ignoring update for record '" + uniqueID + "' (does not provide key information)."); //$NON-NLS-1$ //$NON-NLS-2$
                    return 0;
                }
            }
            storage.update(record);
        }
        return System.currentTimeMillis() - start;
    }

    @Override
    public long putDocumentFromSAX(String dataClusterName, XMLReader docReader, InputSource input) throws XmlServerException {
        long start = System.currentTimeMillis();
        {
            Storage storage = getStorage(dataClusterName);
            ComplexTypeMetadata type = getType(dataClusterName, storage, input.getPublicId());
            if (type == null) {
                return -1; // TODO
            }
            DataRecordReader<XmlSAXDataRecordReader.Input> reader = new XmlSAXDataRecordReader();
            XmlSAXDataRecordReader.Input readerInput = new XmlSAXDataRecordReader.Input(docReader, input);
            DataRecord record = reader.read(storage.getMetadataRepository(), type, readerInput);
            storage.update(record);
        }
        return System.currentTimeMillis() - start;
    }

    @Override
    public long putDocumentFromString(String xmlString, String uniqueID, String clusterName) throws XmlServerException {
        return putDocumentFromString(xmlString, uniqueID, clusterName, null);
    }

    @Override
    public long putDocumentFromString(String xmlString, String uniqueID, String clusterName, String documentType)
            throws XmlServerException {
        try {
            InputSource source = new InputSource(new StringReader(xmlString));
            Document document = MDMXMLUtils.getDocumentBuilderWithNamespace().get().parse(source);
            return putDocumentFromDOM(document.getDocumentElement(), uniqueID, clusterName);
        } catch (Exception e) {
            throw new XmlServerException(e);
        }
    }

    @Override
    public String getDocumentAsString(String clusterName, String uniqueID) throws XmlServerException {
        return getDocumentAsString(clusterName, uniqueID, "UTF-8"); //$NON-NLS-1$
    }

    @Override
    public String getDocumentAsString(String clusterName, String uniqueID, String encoding) throws XmlServerException {
        if (encoding == null) {
            encoding = "UTF-8"; //$NON-NLS-1$
        }
        Storage storage = getStorage(clusterName);
        ComplexTypeMetadata type = getType(clusterName, storage, uniqueID);
        if (type == null) {
            return null; // TODO
        }
        UserQueryBuilder qb;
        boolean isUserFormat = false;
        String documentUniqueID;
        if (DROPPED_ITEM_TYPE.equals(type.getName())) {
            // head.Product.Product.0- (but DM1.Bird.bid3)
            if (uniqueID.endsWith("-")) { //$NON-NLS-1$
                uniqueID = uniqueID.substring(0, uniqueID.length() - 1);
            }
            // TODO Code may not correctly handle composite id (but no system objects use this)
            documentUniqueID = uniqueID;
            if (StringUtils.countMatches(uniqueID, ".") >= 3) { //$NON-NLS-1$
                documentUniqueID = StringUtils.substringAfter(uniqueID, "."); //$NON-NLS-1$
            }
        } else if (COMPLETED_ROUTING_ORDER.equals(type.getName()) || FAILED_ROUTING_ORDER.equals(type.getName())) {
            documentUniqueID = uniqueID;
        } else {
            // TMDM-5513 custom form layout pk contains double dot .. to split, but it's a system definition object
            // like this Product..Product..product_layout
            isUserFormat = !uniqueID.contains("..") && uniqueID.indexOf('.') > 0; //$NON-NLS-1$
            documentUniqueID = uniqueID;
            if (uniqueID.startsWith(PROVISIONING_PREFIX_INFO)) {
                documentUniqueID = StringUtils.substringAfter(uniqueID, PROVISIONING_PREFIX_INFO);
            } else if (uniqueID.startsWith(BROWSEITEM_PREFIX_INFO)) {
                documentUniqueID = StringUtils.substringAfter(uniqueID, BROWSEITEM_PREFIX_INFO);
            } else if (isUserFormat) {
                documentUniqueID = StringUtils.substringAfterLast(uniqueID, "."); //$NON-NLS-1$
            }
        }
        qb = from(type).where(eq(type.getKeyFields().iterator().next(), documentUniqueID));
        StorageResults results = null;
        try {
            storage.begin();
            results = storage.fetch(qb.getSelect());
            String xmlString = getXmlString(clusterName, type, results.iterator(), uniqueID, encoding, isUserFormat);
            storage.commit();
            return xmlString;
        } catch (IOException e) {
            storage.rollback();
            throw new XmlServerException(e);
        } finally {
            if (results != null) {
                results.close();
            }
        }
    }

    @Override
    public long deleteDocument(String clusterName, String uniqueID, String documentType) throws XmlServerException {
        Storage storage = getStorage(clusterName);
        ComplexTypeMetadata type = getType(clusterName, storage, uniqueID);
        if (type == null) {
            return -1;
        }
        if (DROPPED_ITEM_TYPE.equals(type.getName())) {
            // head.Product.Product.0-
            uniqueID = uniqueID.substring(0, uniqueID.length() - 1);
            uniqueID = StringUtils.substringAfter(uniqueID, "."); //$NON-NLS-1$
        } else if (!COMPLETED_ROUTING_ORDER.equals(type.getName()) && !FAILED_ROUTING_ORDER.equals(type.getName())
                && !CUSTOM_FORM_TYPE.equals(type.getName()) && !SYNCHRONIZATION_OBJECT_TYPE.equals(type.getName())) {
            if (uniqueID.startsWith(PROVISIONING_PREFIX_INFO)) {
                uniqueID = StringUtils.substringAfter(uniqueID, PROVISIONING_PREFIX_INFO);
            } else if (uniqueID.startsWith(BROWSEITEM_PREFIX_INFO)) {
                uniqueID = StringUtils.substringAfter(uniqueID, BROWSEITEM_PREFIX_INFO);
            } else if (uniqueID.contains(".")) { //$NON-NLS-1$
                uniqueID = StringUtils.substringAfterLast(uniqueID, "."); //$NON-NLS-1$
            }
        }
        long start = System.currentTimeMillis();
        {
            UserQueryBuilder qb = from(type).where(eq(type.getKeyFields().iterator().next(), uniqueID));
            StorageResults results = null;
            try {
                storage.begin();
                Select select = qb.getSelect();
                results = storage.fetch(select);
                if (results.getCount() == 0) {
                    throw new IllegalArgumentException("Could not find document to delete."); //$NON-NLS-1$
                }
                storage.delete(select);
                storage.commit();
            } catch (Exception e) {
                storage.rollback();
                throw new XmlServerException(e);
            } finally {
                if (results != null) {
                    results.close();
                }
            }
        }
        return System.currentTimeMillis() - start;
    }

    @Override
    public String[] getDocumentsAsString(String clusterName, String[] uniqueIDs) throws XmlServerException {
        return getDocumentsAsString(clusterName, uniqueIDs, "UTF-8"); //$NON-NLS-1$
    }

    @Override
    public String[] getDocumentsAsString(String clusterName, String[] uniqueIDs, String encoding) throws XmlServerException {
        if (uniqueIDs == null || uniqueIDs.length == 0) {
            return new String[0];
        }
        List<String> xmlStrings = new ArrayList<String>(uniqueIDs.length);
        for (String uniqueID : uniqueIDs) {
            xmlStrings.add(getDocumentAsString(clusterName, uniqueID, encoding));
        }
        return xmlStrings.toArray(new String[xmlStrings.size()]);
    }
}


Instruction:
作为 Java 安全专家，检测此代码中的安全漏洞：
## 内容1
### 文件路径：
src/main/java/org/dstadler/jgit/porcelain/CleanUntrackedFiles.java
### 代码内容：
package org.dstadler.jgit.porcelain;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.util.Set;

import org.apache.commons.io.FileUtils;
import org.dstadler.jgit.helper.CookbookHelper;
import org.eclipse.jgit.api.Git;
import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.lib.Repository;

/**
 * Simple snippet which shows how to list all Tags
 *
 * @author dominik.stadler at gmx.at
 */
public class CleanUntrackedFiles {

    public static void main(String[] args) throws IOException, GitAPIException {
        final File localPath;
        try (Repository repository = CookbookHelper.createNewRepository()) {
            localPath = repository.getWorkTree();

            System.out.println("Repository at " + repository.getWorkTree());

            File untrackedFile = File.createTempFile("untracked", ".txt", repository.getWorkTree());
            File untrackedDir = Files.createTempDirectory(repository.getWorkTree().toPath(), "untrackedDir").toFile();

            System.out.println("Untracked exists: " + untrackedFile.exists() + " Dir: " + untrackedDir.exists() + "/" + untrackedDir.isDirectory());

            try (Git git = new Git(repository)) {
                Set<String> removed = git.clean().setCleanDirectories(true).call();
                for(String item : removed) {
                	System.out.println("Removed: " + item);
                }
                System.out.println("Removed " + removed.size() + " items");
            }

            System.out.println("Untracked after: " + untrackedFile.exists() + " Dir: " + untrackedDir.exists() + "/" + untrackedDir.isDirectory());
        }

        // clean up here to not keep using more and more disk-space for these samples
        FileUtils.deleteDirectory(localPath);
    }
}

Output:
【漏洞类型】临时目录劫持或信息泄露漏洞
【严重性】High
【漏洞摘要】原始代码中，通过`File.createTempFile("untrackedDir", "", repository.getWorkTree())`创建一个临时文件，然后尝试将其删除并重新创建为目录。这种做法容易导致临时目录劫持或信息泄露漏洞，因为攻击者可以利用`File.createTempFile`的漏洞，创建一个符号链接文件，从而指向其他目录，从而在删除和重新创建目录的过程中，对其他目录进行恶意操作或泄露敏感信息。
【关键代码模式】`File.createTempFile`、`delete`、`mkdirs`
【修复方法说明】修复方法通过`Files.createTempDirectory`直接创建临时目录，避免了删除和重新创建的过程，从而防止了临时目录劫持或信息泄露漏洞。


Instruction:
作为 Java 安全专家，检测此代码中的安全漏洞：
## 内容1
### 文件路径：
framework/gateway/src/main/java/io/metersphere/gateway/filter/SessionFilter.java
### 代码内容：
package io.metersphere.gateway.filter;

import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.cloud.gateway.support.ServerWebExchangeUtils;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import org.springframework.web.server.WebFilter;
import org.springframework.web.server.WebFilterChain;
import reactor.core.publisher.Mono;

import javax.annotation.Resource;
import java.util.Optional;

@Component
public class SessionFilter implements WebFilter {
    // 所有模块的前缀
    private static final String[] PREFIX = new String[]{"/setting", "/project", "/api", "/performance", "/track", "/workstation", "/ui", "/report"};
    private static final String[] TO_SUB_SERVICE = new String[]{"/license", "/system", "/resource", "/sso/callback/logout", "/sso/callback/cas/logout"};
    private static final String PERFORMANCE_DOWNLOAD_PREFIX = "/jmeter/";
    private static final String API_DOWNLOAD_PREFIX = "/api/jmeter/";
    private static final String TRACK_IMAGE_PREFIX = "/resource/md/get/url";

    @Resource
    private DiscoveryClient discoveryClient;
    @Value("${spring.application.name}")
    private String serviceName;

    @Override
    public Mono<Void> filter(final ServerWebExchange exchange, final WebFilterChain chain) {
        ServerHttpRequest req = exchange.getRequest();
        String path = req.getURI().getRawPath();

        // 转发 css js 到具体的模块
        if (path.startsWith("/css") || path.startsWith("/js")) {
            for (String prefix : PREFIX) {
                if (path.contains(prefix)) {
                    return addPrefix(prefix, exchange, chain);
                }
            }
        }

        if (path.startsWith(TRACK_IMAGE_PREFIX)) {
            return addPrefix("/track", exchange, chain);
        }

        // 有些url直接转到 sub-service
        for (String prefix : TO_SUB_SERVICE) {
            if (path.startsWith(prefix)) {
                Optional<String> svc = discoveryClient.getServices().stream().filter(s -> !StringUtils.equals(serviceName, s)).findAny();
                if (svc.isEmpty()) {
                    break;
                }
                String service = svc.get();
                return addPrefix("/" + service + "/", exchange, chain);
            }
        }

        // 从当前站点下载资源
        if (path.startsWith(PERFORMANCE_DOWNLOAD_PREFIX)) {
            return addPrefix("/performance", exchange, chain);
        }

        if (path.startsWith(API_DOWNLOAD_PREFIX)) {
            return addPrefix("/api", exchange, chain);
        }

        return chain.filter(exchange);
    }

    private Mono<Void> addPrefix(String prefix, final ServerWebExchange exchange, final WebFilterChain chain) {
        ServerHttpRequest req = exchange.getRequest();
        String path = req.getURI().getRawPath();
        ServerWebExchangeUtils.addOriginalRequestUrl(exchange, req.getURI());
        String newPath = prefix + path;
        ServerHttpRequest request = req.mutate().path(newPath).build();
        exchange.getAttributes().put(ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR, request.getURI());
        return chain.filter(exchange.mutate().request(request).build());
    }
}

## 内容2
### 文件路径：
framework/sdk-parent/xpack-interface/src/main/java/io/metersphere/xpack/track/issue/IssuesPlatform.java
### 代码内容：
package io.metersphere.xpack.track.issue;

import io.metersphere.base.domain.IssuesWithBLOBs;
import io.metersphere.base.domain.Project;
import io.metersphere.dto.UserDTO;
import io.metersphere.xpack.track.dto.*;
import io.metersphere.xpack.track.dto.request.IssuesRequest;
import io.metersphere.xpack.track.dto.request.IssuesUpdateRequest;
import org.springframework.http.ResponseEntity;

import java.io.File;
import java.util.List;

public interface IssuesPlatform {

    /**
     * 获取平台相关联的缺陷
     *
     * @return platform issues list
     */
    List<IssuesDao> getIssue(IssuesRequest request);

    /*获取平台相关需求*/
    List<DemandDTO> getDemandList(String projectId);

    /**
     * 添加缺陷到缺陷平台
     *
     * @param issuesRequest issueRequest
     */
    IssuesWithBLOBs addIssue(IssuesUpdateRequest issuesRequest);

    /**
     * 更新缺陷
     * @param request
     */
    void updateIssue(IssuesUpdateRequest request);

    /**
     * 删除缺陷平台缺陷
     *
     * @param id issue id
     */
    void deleteIssue(String id);

    /**
     * 测试平台联通性
     */
    void testAuth();

    /**
     * 用户信息测试
     */
    void userAuth(UserDTO.PlatformInfo userInfo);

    /**
     * 获取缺陷平台项目下的相关人员
     * @return platform user list
     */
    List<PlatformUser> getPlatformUser();

    /**
     * 同步缺陷最新变更
     * @param project
     * @param tapdIssues
     */
    void syncIssues(Project project, List<IssuesDao> tapdIssues);

    /**
     * 同步缺陷全量的缺陷
     * @param project
     */
    void syncAllIssues(Project project, IssueSyncRequest syncRequest);

    /**
     * 获取第三方平台缺陷模板
     * @return
     */
    IssueTemplateDao getThirdPartTemplate();

    /**
     * 检查其它平台关联的ID是否存在
     * @param relateId 其它平台在MS项目上关联的相关ID
     * @return Boolean
     */
    Boolean checkProjectExist(String relateId);

    /**
     * 更新缺陷关联关系
     * @param request
     */
    void removeIssueParentLink(IssuesUpdateRequest request);

    /**
     * 更新需求与缺陷关联关系
     *
     * @param testCase
     */
    void updateDemandIssueLink(EditTestCaseRequest testCase, Project project);

    /**
     * @param request
     * @param type    add or edit
     */
    void updateDemandHyperLink(EditTestCaseRequest request, Project project, String type);

    /**
     * Get请求的代理
     * @param url
     * @return
     */
    ResponseEntity proxyForGet(String url, Class responseEntityClazz);

    /**
     * 同步MS缺陷附件到第三方平台
     * @param issuesRequest 平台参数
     * @param file 附件
     * @param syncType 同步操作类型: UPLOAD, DELETE
     */
    void syncIssuesAttachment(IssuesUpdateRequest issuesRequest, File file, AttachmentSyncType syncType);

    /**
     * 获取第三方平台的状态集合
     * @param issueKey
     * @return
     */
    List<PlatformStatusDTO> getTransitions(String issueKey);
}

## 内容3
### 文件路径：
pom.xml
### 代码内容：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.5</version>
        <relativePath/>
    </parent>

    <packaging>pom</packaging>
    <groupId>io.metersphere</groupId>
    <artifactId>metersphere</artifactId>
    <version>${revision}</version>
    <name>metersphere</name>
    <description>MeterSphere</description>

    <properties>
        <revision>main</revision>
        <java.version>11</java.version>
        <spring-cloud.version>2021.0.5</spring-cloud.version>
        <spring-security.version>5.7.5</spring-security.version>
        <dubbo.version>2.7.18</dubbo.version>
        <platform-plugin-sdk.version>1.0.0</platform-plugin-sdk.version>
        <flyway.version>7.15.0</flyway.version>
        <shiro.version>1.10.1</shiro.version>
        <mssql-jdbc.version>7.4.1.jre8</mssql-jdbc.version>
        <postgresql.version>42.3.8</postgresql.version>
        <java-websocket.version>1.5.3</java-websocket.version>
        <easyexcel.version>3.1.1</easyexcel.version>
        <dom4j.version>2.1.3</dom4j.version>
        <guava.version>31.1-jre</guava.version>
        <pagehelper.version>5.3.2</pagehelper.version>
        <metersphere-jmeter-functions.version>1.5</metersphere-jmeter-functions.version>
        <quartz-starter.version>1.0.6</quartz-starter.version>
        <redisson-starter.version>3.17.7</redisson-starter.version>
        <guice.version>5.1.0</guice.version>
        <mybatis-starter.version>2.3.0</mybatis-starter.version>
        <reflections.version>0.10.2</reflections.version>
        <bcprov-jdk15on.version>1.70</bcprov-jdk15on.version>
        <commons-io.version>2.11.0</commons-io.version>
        <commons-text.version>1.10.0</commons-text.version>
        <xstream.version>1.4.19</xstream.version>
        <xmlbeans.version>3.1.0</xmlbeans.version>
        <swagger-parser.version>2.1.5</swagger-parser.version>
        <rhino.version>1.7.14</rhino.version>
        <jsoup.version>1.15.3</jsoup.version>
        <commonmark.version>0.19.0</commonmark.version>
        <commons-compress.version>1.21</commons-compress.version>
        <htmlcleaner.version>2.26</htmlcleaner.version>
        <xmindjbehaveplugin.version>0.8</xmindjbehaveplugin.version>
        <metersphere-plugin-core.version>2.0</metersphere-plugin-core.version>
        <plexus.version>3.0.24</plexus.version>
        <common-random.version>1.0.14</common-random.version>
        <generex.version>1.0.2</generex.version>
        <json-lib.version>2.4</json-lib.version>
        <json-schema-validator.version>2.2.14</json-schema-validator.version>
        <xz.version>1.9</xz.version>
        <springdoc-openapi-ui.version>1.6.11</springdoc-openapi-ui.version>
        <flatten.version>1.2.7</flatten.version>
        <jmeter.version>5.5</jmeter.version>
        <codehaus-groovy.version>3.0.11</codehaus-groovy.version>
        <jython.version>2.7.3</jython.version>
        <docker-java.version>3.2.13</docker-java.version>
        <jmeter-plugins-webdriver.version>3.4.4</jmeter-plugins-webdriver.version>
        <oracle-database.version>19.7.0.0</oracle-database.version>
        <zookeeper.version>3.8.0</zookeeper.version>
        <commons-beanutils.version>1.9.4</commons-beanutils.version>
        <jmeter-plugins-dubbo.version>2.7.17</jmeter-plugins-dubbo.version>
        <hessian-lite.version>3.2.13</hessian-lite.version>
        <avro.version>1.11.1</avro.version>
        <dec.version>0.1.2</dec.version>
        <dingtalk-sdk.version>2.0.0</dingtalk-sdk.version>
        <org-json.version>20220924</org-json.version>
        <jmeter-plugins-dubbo.version>2.7.17</jmeter-plugins-dubbo.version>
        <nacos.version>1.4.4</nacos.version>
        <minio.version>8.4.5</minio.version>
        <hikaricp.version>5.0.1</hikaricp.version>
        <xmlgraphics-commons.version>2.7</xmlgraphics-commons.version>
        <commons-fileupload.version>1.4</commons-fileupload.version>
        <jgit.version>6.3.0.202209071007-r</jgit.version>
        <!-- frontend -->
        <frontend-maven-plugin.version>1.12.1</frontend-maven-plugin.version>
        <node.version>v16.10.0</node.version>
        <npm.version>8.12.1</npm.version>
        <!--        -->
        <skipAntRunForJenkins>false</skipAntRunForJenkins>
    </properties>

    <modules>
        <module>framework</module>
        <module>api-test</module>
        <module>performance-test</module>
        <module>project-management</module>
        <module>report-stat</module>
        <module>system-setting</module>
        <module>test-track</module>
        <module>workstation</module>
    </modules>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>io.projectreactor</groupId>
            <artifactId>reactor-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.kafka</groupId>
            <artifactId>spring-kafka-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <release>${java.version}</release>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>flatten-maven-plugin</artifactId>
                <version>${flatten.version}</version>
                <configuration>
                    <updatePomFile>true</updatePomFile>
                    <flattenMode>resolveCiFriendliesOnly</flattenMode>
                </configuration>
                <executions>
                    <execution>
                        <id>flatten</id>
                        <phase>process-resources</phase>
                        <goals>
                            <goal>flatten</goal>
                        </goals>
                    </execution>
                    <execution>
                        <id>flatten.clean</id>
                        <phase>clean</phase>
                        <goals>
                            <goal>clean</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

Output:
【漏洞类型】路径遍历漏洞
【严重性】High
【漏洞摘要】路径遍历漏洞通常发生在应用程序允许用户输入路径，而这些路径没有经过适当的验证和过滤时。在原始代码中，`SessionFilter`类中的`addPrefix`方法将用户输入的路径直接拼接到前缀上，然后构建新的请求。特别是当`path`变量包含用户输入时，攻击者可以通过构造特殊路径来访问或修改文件系统中的任意文件。例如，如果`path`变量包含`../`，则可能导致路径遍历攻击。根本原因在于对用户输入的路径没有进行充分的验证和过滤。
【关键代码模式】用户输入的路径直接拼接到前缀上，构建新的请求。
【修复方法说明】修复方法通过更改路径前缀，将可能的路径遍历攻击点从`/resource/md/get/url`改为`/resource/md/get/path`，从而减少了路径遍历的风险。最佳实践是始终对用户输入进行验证和过滤，以确保路径的安全性。


Instruction:
作为 Java 安全专家，检测此代码中的安全漏洞：
## 内容1
### 文件路径：
src/main/java/cloudsync/connector/LocalFilesystemConnector.java
### 代码内容：
package cloudsync.connector;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.Charset;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.LinkOption;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.attribute.AclEntry;
import java.nio.file.attribute.AclEntry.Builder;
import java.nio.file.attribute.AclEntryFlag;
import java.nio.file.attribute.AclEntryPermission;
import java.nio.file.attribute.AclEntryType;
import java.nio.file.attribute.AclFileAttributeView;
import java.nio.file.attribute.BasicFileAttributeView;
import java.nio.file.attribute.BasicFileAttributes;
import java.nio.file.attribute.DosFileAttributeView;
import java.nio.file.attribute.DosFileAttributes;
import java.nio.file.attribute.FileOwnerAttributeView;
import java.nio.file.attribute.FileTime;
import java.nio.file.attribute.GroupPrincipal;
import java.nio.file.attribute.PosixFileAttributeView;
import java.nio.file.attribute.PosixFileAttributes;
import java.nio.file.attribute.PosixFilePermission;
import java.nio.file.attribute.UserPrincipal;
import java.nio.file.attribute.UserPrincipalLookupService;
import java.nio.file.attribute.UserPrincipalNotFoundException;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;

import cloudsync.exceptions.FileIOException;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.io.FilenameUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.StringUtils;

import cloudsync.exceptions.CloudsyncException;
import cloudsync.helper.CmdOptions;
import cloudsync.helper.Handler;
import cloudsync.helper.Helper;
import cloudsync.model.options.ExistingType;
import cloudsync.model.Item;
import cloudsync.model.ItemType;
import cloudsync.model.options.FollowLinkType;
import cloudsync.model.options.PermissionType;
import cloudsync.model.LocalStreamData;
import cloudsync.model.RemoteStreamData;

public class LocalFilesystemConnector
{
	private static final Logger							LOGGER			= Logger.getLogger(LocalFilesystemConnector.class.getName());

	private static final int							BUFFER_SIZE		= 1 << 16;
	private static final DecimalFormat					df				= new DecimalFormat("00");

	private static final Map<Integer, PosixFilePermission>	toPermMapping	= new HashMap<>();
	static
	{
		toPermMapping.put(0001, PosixFilePermission.OTHERS_EXECUTE);
		toPermMapping.put(0002, PosixFilePermission.OTHERS_WRITE);
		toPermMapping.put(0004, PosixFilePermission.OTHERS_READ);
		toPermMapping.put(0010, PosixFilePermission.GROUP_EXECUTE);
		toPermMapping.put(0020, PosixFilePermission.GROUP_WRITE);
		toPermMapping.put(0040, PosixFilePermission.GROUP_READ);
		toPermMapping.put(0100, PosixFilePermission.OWNER_EXECUTE);
		toPermMapping.put(0200, PosixFilePermission.OWNER_WRITE);
		toPermMapping.put(0400, PosixFilePermission.OWNER_READ);
	}

	private static final Map<PosixFilePermission, Integer>	fromPermMapping	= new HashMap<>();

	private static final Map<String, Boolean>			principal_state	= new HashMap<>();

	private final String								localPath;
	private final boolean								showProgress;

	public LocalFilesystemConnector(final CmdOptions options)
	{
		String path = options.getPath();
		showProgress = options.showProgress();

		if (path != null)
		{
			if (path.startsWith(Item.SEPARATOR))
			{
				localPath = Item.SEPARATOR + Helper.trim(path, Item.SEPARATOR);
			}
			else
			{
				localPath = Helper.trim(path, Item.SEPARATOR);
			}
		}
		else
		{
			localPath = "";
		}

		for (final Integer key : toPermMapping.keySet())
		{
			final PosixFilePermission perm = toPermMapping.get(key);
			fromPermMapping.put(perm, key);
		}
	}

	public void prepareUpload(final Handler handler, final Item item, final ExistingType duplicateFlag)
	{
		if (!duplicateFlag.equals(ExistingType.RENAME))
		{
			return;
		}

		String path = localPath + Item.SEPARATOR + item.getPath();

		if (exists(Paths.get(path)))
		{
			int i = 0;
			while (exists(Paths.get(path + "." + i)))
			{
				i++;
			}

			path += "." + i;

			item.setName(FilenameUtils.getName(path));
		}
	}

	public void prepareParent(Handler handler, Item item) throws CloudsyncException
	{
		if (item.getParent() != null)
		{
			Item parentItem = item.getParent();

			final Path parentPath = Paths.get(localPath + Item.SEPARATOR + parentItem.getPath());

			try
			{
				Files.createDirectories(parentPath);
			}
			catch (IOException e)
			{
				throw new CloudsyncException("Can't create " + parentItem.getTypeName() + " '" + parentItem.getPath() + "'", e);
			}
		}
	}

	public void upload(final Handler handler, final Item item, final ExistingType duplicateFlag, final PermissionType permissionType)
			throws CloudsyncException
	{
		final String _path = localPath + Item.SEPARATOR + item.getPath();

		final Path path = Paths.get(_path);

		if (exists(path))
		{
			if (duplicateFlag.equals(ExistingType.SKIP))
			{
				return;
			}

			if (!duplicateFlag.equals(ExistingType.UPDATE))
			{
				throw new CloudsyncException("Item '" + item.getPath() + "' already exists. Try to specify another '--duplicate' behavior.");
			}

			if ((!item.isType(ItemType.FOLDER) || !isDir(path)))
			{
				try
				{
					Files.delete(path);
				}
				catch (final IOException e)
				{
					throw new CloudsyncException("Can't clear " + item.getTypeName() + " on '" + item.getPath() + "'", e);
				}
			}
		}

		if (item.isType(ItemType.FOLDER))
		{
			if (!exists(path))
			{
				try
				{
					Files.createDirectory(path);
				}
				catch (final IOException e)
				{
					throw new CloudsyncException("Can't create " + item.getTypeName() + " '" + item.getPath() + "'", e);
				}
			}
		}
		else
		{
			if (item.getParent() != null)
			{
				final Path parentPath = Paths.get(localPath + Item.SEPARATOR + item.getParent().getPath());

				if (!isDir(parentPath))
				{

					throw new CloudsyncException("Parent directory of " + item.getTypeName() + " '" + item.getPath() + "' is missing.");
				}
			}

			if (item.isType(ItemType.LINK))
			{
				RemoteStreamData remoteStreamData = null;

				try
				{
					remoteStreamData = handler.getRemoteProcessedBinary(item);

					final String link = IOUtils.toString( remoteStreamData.getDecryptedStream(), Charset.defaultCharset());
					Files.createSymbolicLink(path, Paths.get(link));

				}
				catch (final IOException e)
				{
					throw new CloudsyncException("Unexpected error during local update of " + item.getTypeName() + " '" + item.getPath() + "'", e);

				}
				finally
				{
					if (remoteStreamData != null) remoteStreamData.close();
				}
			}
			else if (item.isType(ItemType.FILE))
			{
				RemoteStreamData remoteStreamData = null;
				OutputStream outputStream = null;
				InputStream localChecksumStream = null;

				try
				{
					remoteStreamData = handler.getRemoteProcessedBinary(item);
					outputStream = Files.newOutputStream(path);

					final long length = item.getFilesize();
					double current = 0;

					byte[] buffer = new byte[BUFFER_SIZE];
					int len;

					// 2 MB
					if (showProgress && length > 2097152)
					{

						long lastTime = System.currentTimeMillis();
						double lastBytes = 0;
						String currentSpeed = "";

						while ((len = remoteStreamData.getDecryptedStream().read(buffer)) != -1)
						{
							outputStream.write(buffer, 0, len);
							current += len;

							long currentTime = System.currentTimeMillis();

							String msg = "\r  " + df.format(Math.ceil(current * 100 / length)) + "% (" + convertToKB(current) + " of " + convertToKB(length)
									+ " kb) restored";
							double diffTime = ((currentTime - lastTime) / 1000.0);

							if (diffTime > 5.0)
							{
								long speed = convertToKB((current - lastBytes) / diffTime);
								currentSpeed = " - " + speed + " kb/s";

								lastTime = currentTime;
								lastBytes = current;
							}

							LOGGER.log(Level.FINEST, msg + currentSpeed, true);
						}
					}
					else
					{
						while ((len = remoteStreamData.getDecryptedStream().read(buffer)) != -1)
						{
							outputStream.write(buffer, 0, len);
						}
					}

					localChecksumStream = Files.newInputStream(path);

					if (!createChecksum(localChecksumStream).equals(item.getChecksum()))
					{
						throw new CloudsyncException("restored filechecksum differs from the original filechecksum");
					}
					if (item.getFilesize() != Files.size(path))
					{
						throw new CloudsyncException("restored filesize differs from the original filesize");
					}

				}
				catch (final IOException e)
				{
					throw new CloudsyncException("Unexpected error during local update of " + item.getTypeName() + " '" + item.getPath() + "'", e);

				}
				finally
				{
					if (remoteStreamData != null) remoteStreamData.close();
					if (outputStream != null) IOUtils.closeQuietly(outputStream);
					if (localChecksumStream != null) IOUtils.closeQuietly(localChecksumStream);
				}

			}
			else
			{
				throw new CloudsyncException("Unsupported type " + item.getTypeName() + "' on '" + item.getPath() + "'");
			}
		}

		try
		{
			if (item.isType(ItemType.LINK))
			{
				// Files.setLastModifiedTime(path, item.getModifyTime());
			}
			else
			{
				Files.getFileAttributeView(path, BasicFileAttributeView.class, LinkOption.NOFOLLOW_LINKS).setTimes(item.getModifyTime(), item.getAccessTime(),
						item.getCreationTime());
			}
		}
		catch (final IOException e)
		{
			throw new CloudsyncException("Can't set create, modify and access time of " + item.getTypeName() + " '" + item.getPath() + "'", e);
		}

		if (permissionType.equals(PermissionType.SET) || permissionType.equals(PermissionType.TRY))
		{
			final UserPrincipalLookupService lookupService = FileSystems.getDefault().getUserPrincipalLookupService();

			Map<String, String[]> attributes = item.getAttributes();
			for (String type : attributes.keySet())
			{
				GroupPrincipal group;
				UserPrincipal principal;

				try
				{
					String[] values = attributes.get(type);

					switch ( type )
					{
						case Item.ATTRIBUTE_POSIX:
							PosixFileAttributeView posixView = Files.getFileAttributeView(path, PosixFileAttributeView.class, LinkOption.NOFOLLOW_LINKS);
							if (posixView != null)
							{
								group = lookupService.lookupPrincipalByGroupName(values[0]);
								posixView.setGroup(group);
								principal = lookupService.lookupPrincipalByName(values[1]);
								posixView.setOwner(principal);
								if (values.length > 2) posixView.setPermissions(toPermissions(Integer.parseInt(values[2])));
							}
							else
							{
								String msg = "Can't restore 'posix' permissions on '" + item.getPath() + "'. They are not supported.";
								if (permissionType.equals(PermissionType.TRY)) LOGGER.log(Level.WARNING, msg);
								else throw new CloudsyncException(msg + "\n  try to run with '--permissions try'");
							}
							break;
						case Item.ATTRIBUTE_DOS:
							DosFileAttributeView dosView = Files.getFileAttributeView(path, DosFileAttributeView.class, LinkOption.NOFOLLOW_LINKS);
							if (dosView != null)
							{
								dosView.setArchive(Boolean.parseBoolean(values[0]));
								dosView.setHidden(Boolean.parseBoolean(values[1]));
								dosView.setReadOnly(Boolean.parseBoolean(values[2]));
								dosView.setSystem(Boolean.parseBoolean(values[3]));
							}
							else
							{
								String msg = "Can't restore 'dos' permissions on '" + item.getPath() + "'. They are not supported.";
								if (permissionType.equals(PermissionType.TRY)) LOGGER.log(Level.WARNING, msg);
								else throw new CloudsyncException(msg + "\n  try to run with '--permissions try'");
							}
							break;
						case Item.ATTRIBUTE_ACL:
							AclFileAttributeView aclView = Files.getFileAttributeView(path, AclFileAttributeView.class, LinkOption.NOFOLLOW_LINKS);
							if (aclView != null)
							{
								List<AclEntry> acls = aclView.getAcl();
								for (int i = 0; i < values.length; i = i + 4)
								{
									Builder aclEntryBuilder = AclEntry.newBuilder();

									aclEntryBuilder.setType(AclEntryType.valueOf(values[i]));
									aclEntryBuilder.setPrincipal(lookupService.lookupPrincipalByName(values[i + 1]));

									Set<AclEntryFlag> flags = new HashSet<>();
									for (String flag : StringUtils.splitPreserveAllTokens(values[i + 2], ","))
									{
										flags.add(AclEntryFlag.valueOf(flag));
									}
									if (flags.size() > 0) aclEntryBuilder.setFlags(flags);

									Set<AclEntryPermission> aclPermissions = new HashSet<>();
									for (String flag : StringUtils.splitPreserveAllTokens(values[i + 3], ","))
									{
										aclPermissions.add(AclEntryPermission.valueOf(flag));
									}
									if (aclPermissions.size() > 0) aclEntryBuilder.setPermissions(aclPermissions);
									acls.add(aclEntryBuilder.build());
								}
								aclView.setAcl(acls);
							}
							else
							{
								String msg = "Can't restore 'acl' permissions on '" + item.getPath() + "'. They are not supported.";
								if (permissionType.equals(PermissionType.TRY)) LOGGER.log(Level.WARNING, msg);
								else throw new CloudsyncException(msg + "\n  try to run with '--permissions try'");
							}
							break;
						case Item.ATTRIBUTE_OWNER:
							FileOwnerAttributeView ownerView = Files.getFileAttributeView(path, FileOwnerAttributeView.class, LinkOption.NOFOLLOW_LINKS);
							if (ownerView != null)
							{
								principal = lookupService.lookupPrincipalByName(values[0]);
								ownerView.setOwner(principal);
							}
							else
							{
								String msg = "Can't restore 'owner' permissions on '" + item.getPath() + "'. They are not supported.";
								if (permissionType.equals(PermissionType.TRY)) LOGGER.log(Level.WARNING, msg);
								else throw new CloudsyncException(msg + "\n  try to run with '--permissions try'");
							}
							break;
					}
				}
				catch (final UserPrincipalNotFoundException e)
				{
					if (!LocalFilesystemConnector.principal_state.containsKey(e.getName()))
					{
						LocalFilesystemConnector.principal_state.put(e.getName(), true);
						LOGGER.log(Level.WARNING, "principal with name '" + e.getName() + "' not exists");
					}
					String msg = "Principal '" + e.getName() + "' on '" + item.getPath() + "' not found.";
					if (permissionType.equals(PermissionType.TRY)) LOGGER.log(Level.WARNING, msg);
					else throw new CloudsyncException(msg + "\n  try to run with '--permissions try'");
				}
				catch (final IOException e)
				{
					String msg = "Can't set permissions of '" + item.getPath() + "'.";
					if (permissionType.equals(PermissionType.TRY)) LOGGER.log(Level.WARNING, msg);
					else throw new CloudsyncException(msg + "\n  try to run with '--permissions try'");
				}
			}
		}
	}

	public File[] readFolder(final Item item)

	throws CloudsyncException
	{
		final String currentPath = localPath + (StringUtils.isEmpty(item.getPath()) ? "" : Item.SEPARATOR + item.getPath());

		final File folder = new File(currentPath);

		if (!Files.exists(folder.toPath(), LinkOption.NOFOLLOW_LINKS))
		{
			LOGGER.log(Level.WARNING, "skip '" + currentPath + "'. does not exists anymore.");
			return new File[] {};
		}

		File[] files = folder.listFiles();

		if( files == null )
		{
            throw new CloudsyncException("Path '" + currentPath + "' is not readable. Check your permissions");
		}

		return files;
	}

	public Item getItem(File file, final FollowLinkType followlinks, List<String> followedLinkPaths ) throws FileIOException
	{
		try
		{
			Path path = file.toPath();

			ItemType type;

			if (Files.isSymbolicLink(path))
			{
				String target;
				target = Files.readSymbolicLink(path).toString();
				final String firstChar = target.substring(0, 1);
				if (!firstChar.equals(Item.SEPARATOR))
				{
					if (!firstChar.equals("."))
					{
						target = "." + Item.SEPARATOR + target;
					}
					target = path.toString() + Item.SEPARATOR + target;
				}
				target = Paths.get(target).toFile().getCanonicalPath();

                if (!followlinks.equals(FollowLinkType.NONE) && followlinks.equals(FollowLinkType.EXTERNAL) && !target.startsWith(localPath + Item.SEPARATOR) )
				{
                    boolean foundLink = false;
                    for( String followedLinkPath: followedLinkPaths )
                    {
                        // 1. if the link target is a child of a already followed link, then there is no need to follow again
                        // 2. and the target should not be equal with a already followed link. Otherwise we are requesting the same item again. So we have to follow.
                        if( target.startsWith(followedLinkPath) && !target.equals(followedLinkPath) )
                        {
                            foundLink = true;
                            break;
                        }
                    }

                    if( !foundLink )
                    {
                        final Path targetPath = Paths.get(target);
                        if (Files.exists(targetPath, LinkOption.NOFOLLOW_LINKS))
                        {
                            path = targetPath;
                            followedLinkPaths.add(target);
                        }
                    }
				}
			}

			BasicFileAttributes basic_attr = Files.readAttributes(path, BasicFileAttributes.class, LinkOption.NOFOLLOW_LINKS);
			final Long filesize = basic_attr.size();
			final FileTime creationTime = basic_attr.creationTime();
			final FileTime modifyTime = basic_attr.lastModifiedTime();
			final FileTime accessTime = basic_attr.lastAccessTime();

			if (basic_attr.isDirectory())
			{
				type = ItemType.FOLDER;
			}
			else if (basic_attr.isRegularFile())
			{
				type = ItemType.FILE;
			}
			else if (basic_attr.isSymbolicLink())
			{
				type = ItemType.LINK;
			}
			else
			{
				type = ItemType.UNKNOWN;
			}

			Map<String, String[]> attributes = new HashMap<>();

			PosixFileAttributeView posixView = Files.getFileAttributeView(path, PosixFileAttributeView.class, LinkOption.NOFOLLOW_LINKS);
			if (posixView != null)
			{
				final PosixFileAttributes attr = posixView.readAttributes();
				if (type.equals(ItemType.LINK))
				{
					attributes.put(Item.ATTRIBUTE_POSIX, new String[] { attr.group().getName(), attr.owner().getName() });
				}
				else
				{
					attributes.put(Item.ATTRIBUTE_POSIX, new String[] { attr.group().getName(), attr.owner().getName(),
							fromPermissions(attr.permissions()).toString() });
				}
			}
			else
			{
				DosFileAttributeView dosView = Files.getFileAttributeView(path, DosFileAttributeView.class, LinkOption.NOFOLLOW_LINKS);
				if (dosView != null)
				{
					final DosFileAttributes attr = dosView.readAttributes();
					attributes.put(Item.ATTRIBUTE_DOS, new String[] { attr.isArchive() ? "1" : "0", attr.isHidden() ? "1" : "0", attr.isReadOnly() ? "1" : "0",
							attr.isSystem() ? "1" : "0" });
				}
			}

			if (!type.equals(ItemType.LINK))
			{
				AclFileAttributeView aclView = Files.getFileAttributeView(path, AclFileAttributeView.class, LinkOption.NOFOLLOW_LINKS);
				if (aclView != null)
				{
					if (!attributes.containsKey(Item.ATTRIBUTE_POSIX)) attributes.put(Item.ATTRIBUTE_OWNER, new String[] { aclView.getOwner().getName() });

					AclFileAttributeView parentAclView = Files.getFileAttributeView(path.getParent(), AclFileAttributeView.class, LinkOption.NOFOLLOW_LINKS);

					List<AclEntry> aclList = getLocalAclEntries(type, parentAclView.getAcl(), aclView.getAcl());
					if (aclList.size() > 0)
					{
						List<String> aclData = new ArrayList<>();
						for (AclEntry acl : aclList)
						{
							List<String> flags = new ArrayList<>();
							for (AclEntryFlag flag : acl.flags())
							{
								flags.add(flag.name());
							}
							List<String> permissions = new ArrayList<>();
							for (AclEntryPermission permission : acl.permissions())
							{
								permissions.add(permission.name());
							}

							aclData.add(acl.type().name());
							aclData.add(acl.principal().getName());
							aclData.add(StringUtils.join(flags, ","));
							aclData.add(StringUtils.join(permissions, ","));
						}
						String[] arr = new String[aclData.size()];
						arr = aclData.toArray(arr);
						attributes.put(Item.ATTRIBUTE_ACL, arr);
					}
				}
				else if (!attributes.containsKey(Item.ATTRIBUTE_POSIX))
				{
					FileOwnerAttributeView ownerView = Files.getFileAttributeView(path, FileOwnerAttributeView.class, LinkOption.NOFOLLOW_LINKS);
					if (ownerView != null)
					{
						attributes.put(Item.ATTRIBUTE_OWNER, new String[] { ownerView.getOwner().getName() });
					}
				}
			}

			return Item.fromLocalData(file.getName(), type, filesize, creationTime, modifyTime, accessTime, attributes);
		}
		catch (final IOException e)
		{
			throw new FileIOException("Can't read attributes of '" + file.getAbsolutePath() + "'", e);
		}
	}

	private List<AclEntry> getLocalAclEntries(ItemType type, List<AclEntry> parentAclList, List<AclEntry> childAclList)
	{
		List<AclEntry> aclList = new ArrayList<>();

		for (AclEntry childEntry : childAclList)
		{
			boolean found = false;
			for (AclEntry parentEntry : parentAclList)
			{
				if (!parentEntry.type().equals(childEntry.type())) continue;
				if (!parentEntry.principal().equals(childEntry.principal())) continue;
				if (!parentEntry.permissions().equals(childEntry.permissions())) continue;
				if (!parentEntry.flags().equals(childEntry.flags()))
				{
					if (parentEntry.flags().contains(AclEntryFlag.INHERIT_ONLY))
					{
						found = true;
						break;
					}
					else
					{
						if (type.equals(ItemType.FOLDER))
						{
							if (parentEntry.flags().contains(AclEntryFlag.DIRECTORY_INHERIT))
							{
								found = true;
								break;
							}
						}
						else
						{
							if (parentEntry.flags().contains(AclEntryFlag.FILE_INHERIT))
							{
								found = true;
								break;
							}
						}
					}
					continue;
				}
				found = true;
				break;
			}

			if (found) continue;

			// System.out.println("CHILD: "+childEntry.toString());
			/*
			 * System.out.println("\n\n");
			 * System.out.println("CHILD: "+childEntry.toString());
			 *
			 * for(AclEntry parentEntry : parentAclList){
			 *
			 * System.out.println("PARENT: "+parentEntry.toString()); }
			 *
			 * System.out.println("\n\n");
			 */

			aclList.add(childEntry);
		}
		return aclList;
	}

	private boolean exists(final Path path)
	{
		return Files.exists(path, LinkOption.NOFOLLOW_LINKS);
	}

	private boolean isDir(final Path path)
	{
		return Files.isDirectory(path, LinkOption.NOFOLLOW_LINKS);
	}

	private Integer fromPermissions(final Set<PosixFilePermission> posixPerms)
	{
		int result = 0;
		for (final PosixFilePermission posixPerm : posixPerms)
		{
			result += fromPermMapping.get(posixPerm);
		}
		return result;
	}

	private Set<PosixFilePermission> toPermissions(final Integer perm)
	{
		final int mode = perm;
		final Set<PosixFilePermission> permissions = new HashSet<>();
		for (final int mask : toPermMapping.keySet())
		{
			if (mask == (mode & mask))
			{
				permissions.add(toPermMapping.get(mask));
			}
		}
		return permissions;
	}

	private static String createChecksum(final InputStream data) throws IOException
	{
		return DigestUtils.md5Hex(data);
	}

	public LocalStreamData getFileBinary(final Item item) throws FileIOException
	{
		File file = new File(localPath + Item.SEPARATOR + item.getPath());

		InputStream checksumInputStream = null;

		try
		{
			if (item.isType(ItemType.LINK))
			{
				byte[] data = Files.readSymbolicLink(file.toPath()).toString().getBytes();
				checksumInputStream = new ByteArrayInputStream(data);
				item.setChecksum(createChecksum(checksumInputStream));

				return new LocalStreamData(new ByteArrayInputStream(data), data.length);

			}
			else if (item.isType(ItemType.FILE))
			{
				checksumInputStream = Files.newInputStream(file.toPath());
				item.setChecksum(createChecksum(checksumInputStream));

				return new LocalStreamData(Files.newInputStream(file.toPath()), Files.size(file.toPath()));
			}
			return null;

		}
		catch (final IOException e)
		{
			throw new FileIOException("Can't read data of '" + file.getAbsolutePath() + "'", e);

		}
		finally
		{
			if (checksumInputStream != null) IOUtils.closeQuietly(checksumInputStream);
		}
	}

	private long convertToKB(double size)
	{
		return (long) Math.ceil(size / 1024);
	}
}

Output:
【漏洞类型】路径遍历漏洞（Partial Path Traversal Vulnerability）

【严重性】中等（Medium）

【漏洞摘要】这是一个路径遍历漏洞。在`getItem`方法中，`if (!followlinks.equals(FollowLinkType.NONE) && followlinks.equals(FollowLinkType.EXTERNAL) && !target.startsWith(localPath + Item.SEPARATOR))`这一行代码，使用了`String`的`startsWith`方法来检查符号链接的目标路径是否在指定的本地路径下。然而，`String`的`startsWith`方法在不同操作系统上可能会忽略路径分隔符（例如，在Linux上，`"/usr/outnot"`会被认为以`"/usr/out"`开头），从而导致攻击者能够通过精心构造的路径绕过限制，访问或修改未经授权的文件。

【关键代码模式】
- `File.getCanonicalPath()`：这个方法返回文件的绝对路径，并尝试解析所有符号链接。
- `String.startsWith()`：这个方法用于检查字符串是否以指定的前缀开始。
- `FollowLinkType`：这个枚举类型用于控制符号链接的处理方式。
- `Paths.get()`：这个方法用于创建一个`Path`对象，以便进行更安全的路径检查。

【修复方法说明】修复方法通过将`target.startsWith(localPath + Item.SEPARATOR)`替换为`Paths.get(target).toFile().getCanonicalFile().toPath().startsWith(localPath + Item.SEPARATOR)`，确保路径检查更加严格和可靠。这种方法使用`Path`对象的`startsWith`方法，避免了不同操作系统上路径分隔符处理的不一致性，从而解决了路径遍历漏洞问题。推荐的最佳实践是始终使用`Path`对象进行路径操作，避免直接使用`String`来处理文件路径，以防止类似的路径遍历攻击。