Instruction:
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## 内容1
### 文件路径：
xwiki-platform-core/xwiki-platform-skin/xwiki-platform-skin-skinx/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 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>org.xwiki.platform</groupId>
    <artifactId>xwiki-platform-skin</artifactId>
    <version>14.9-SNAPSHOT</version>
  </parent>
  <artifactId>xwiki-platform-skin-skinx</artifactId>
  <name>XWiki Platform - Skin - Skin Extensions</name>
  <description>XWiki Platform - Skin - Skin Extensions</description>
  <properties>
    <xwiki.jacoco.instructionRatio>0.18</xwiki.jacoco.instructionRatio>
  </properties>
  <dependencies>

    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjrt</artifactId>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
    </dependency>
    <dependency>
      <groupId>org.xwiki.platform</groupId>
      <artifactId>xwiki-platform-oldcore</artifactId>
      <version>${project.version}</version>
    </dependency>
    <dependency>
      <groupId>org.xwiki.platform</groupId>
      <artifactId>xwiki-platform-skin-api</artifactId>
      <version>${project.version}</version>
    </dependency>
    <dependency>
      <groupId>org.xwiki.platform</groupId>
      <artifactId>xwiki-platform-lesscss-api</artifactId>
      <version>${project.version}</version>
    </dependency>
    <dependency>
      <groupId>org.xwiki.platform</groupId>
      <artifactId>xwiki-platform-url-scheme-filesystem</artifactId>
      <version>${project.version}</version>
    </dependency>
    <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-lang3</artifactId>
    </dependency>
    <dependency>
      <groupId>org.apache.httpcomponents</groupId>
      <artifactId>httpclient</artifactId>
    </dependency>

    <dependency>
      <groupId>com.yahoo.platform.yui</groupId>
      <artifactId>yuicompressor</artifactId>

      <version>2.4.7-xwiki</version>
    </dependency>

    <dependency>
      <groupId>com.google.javascript</groupId>
      <artifactId>closure-compiler</artifactId>
      <version>${closure-compiler.version}</version>
    </dependency>

    <dependency>
      <groupId>org.xwiki.platform</groupId>
      <artifactId>xwiki-platform-test-oldcore</artifactId>
      <version>${project.version}</version>
      <type>pom</type>
      <scope>test</scope>
    </dependency>
  </dependencies>
  <build>
    <pluginManagement>
      <plugins>

        <plugin>
          <groupId>org.eclipse.m2e</groupId>
          <artifactId>lifecycle-mapping</artifactId>
          <version>1.0.0</version>
          <configuration>
            <lifecycleMappingMetadata>
              <pluginExecutions>
                <pluginExecution>
                  <pluginExecutionFilter>
                    <groupId>org.codehaus.mojo</groupId>
                    <artifactId>aspectj-maven-plugin</artifactId>
                    <versionRange>[1.3,)</versionRange>
                    <goals>
                      <goal>compile</goal>
                    </goals>
                  </pluginExecutionFilter>
                  <action>
                    <ignore />
                  </action>
                </pluginExecution>
              </pluginExecutions>
            </lifecycleMappingMetadata>
          </configuration>
        </plugin>
      </plugins>
    </pluginManagement>
    <plugins>

      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>aspectj-maven-plugin</artifactId>
        <executions>
          <execution>
            <id>backward-compatibility-aspects</id>
            <goals>
              <goal>compile</goal>
            </goals>
            <configuration>
              <aspectDirectory>src/main/aspect/compatibility</aspectDirectory>
            </configuration>
          </execution>
        </executions>
      </plugin>

      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-jar-plugin</artifactId>
        <configuration>
          <excludes>
            <exclude>**/builddef.lst</exclude>
          </excludes>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

## 内容2
### 文件路径：
xwiki-platform-core/xwiki-platform-skin/xwiki-platform-skin-skinx/src/main/java/com/xpn/xwiki/plugin/skinx/AbstractDocumentSkinExtensionPlugin.java
### 代码内容：
/*
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package com.xpn.xwiki.plugin.skinx;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xwiki.bridge.event.DocumentCreatedEvent;
import org.xwiki.bridge.event.DocumentDeletedEvent;
import org.xwiki.bridge.event.DocumentUpdatedEvent;
import org.xwiki.bridge.event.WikiDeletedEvent;
import org.xwiki.model.EntityType;
import org.xwiki.model.reference.DocumentReference;
import org.xwiki.model.reference.EntityReferenceResolver;
import org.xwiki.model.reference.EntityReferenceSerializer;
import org.xwiki.observation.EventListener;
import org.xwiki.observation.ObservationManager;
import org.xwiki.observation.event.Event;
import org.xwiki.security.authorization.AuthorizationManager;
import org.xwiki.security.authorization.ContextualAuthorizationManager;
import org.xwiki.security.authorization.Right;

import com.xpn.xwiki.XWikiContext;
import com.xpn.xwiki.XWikiException;
import com.xpn.xwiki.doc.XWikiDocument;
import com.xpn.xwiki.objects.BaseObject;
import com.xpn.xwiki.objects.classes.BaseClass;
import com.xpn.xwiki.web.Utils;

/**
 * Abstract SX plugin for wiki-document-based extensions (Extensions written as object of a XWiki Extension class).
 * Provides a generic method to initialize the XWiki class upon plugin initialization if needed. Provide a notification
 * mechanism for extensions marked as "use-always".
 *
 * @version $Id$
 * @since 1.4
 * @see JsSkinExtensionPlugin
 * @see CssSkinExtensionPlugin
 */
public abstract class AbstractDocumentSkinExtensionPlugin extends AbstractSkinExtensionPlugin implements EventListener
{
    /**
     * Log helper for logging messages in this class.
     */
    protected static final Logger LOGGER = LoggerFactory.getLogger(AbstractDocumentSkinExtensionPlugin.class);

    /**
     * The name of the field that indicates whether an extension should always be used, or only when explicitly pulled.
     */
    private static final String USE_FIELDNAME = "use";

    /**
     * A Map with wiki/database name as keys and sets of extensions to use always for this wiki as values.
     */
    private Map<String, Set<DocumentReference>> alwaysUsedExtensions;

    /**
     * Used to match events on "use" property.
     */
    private final List<Event> events = new ArrayList<>(3);

    /**
     * XWiki plugin constructor.
     *
     * @param name The name of the plugin, which can be used for retrieving the plugin API from velocity. Unused.
     * @param className The canonical classname of the plugin. Unused.
     * @param context The current request context.
     * @see com.xpn.xwiki.plugin.XWikiDefaultPlugin#XWikiDefaultPlugin(String,String,com.xpn.xwiki.XWikiContext)
     */
    public AbstractDocumentSkinExtensionPlugin(String name, String className, XWikiContext context)
    {
        super(name, className, context);

        this.events.add(new DocumentCreatedEvent());
        this.events.add(new DocumentDeletedEvent());
        this.events.add(new DocumentUpdatedEvent());

        this.events.add(new WikiDeletedEvent());
    }

    @Override
    public List<Event> getEvents()
    {
        return this.events;
    }

    /**
     * The name of the XClass which holds extensions of this type.
     *
     * @return A String representation of the XClass name, in the Space.Document format.
     */
    protected abstract String getExtensionClassName();

    /**
     * A user-friendly name for this type of resource, used in the auto-generated class document.
     *
     * @return The user-friendly name for this type of resource.
     */
    protected abstract String getExtensionName();

    /**
     * {@inheritDoc}
     *

     * Create/update the XClass corresponding to this kind of extension, and register the listeners that update the list
     * of always used extensions.
     *

     *
     * @see com.xpn.xwiki.plugin.XWikiDefaultPlugin#init(com.xpn.xwiki.XWikiContext)
     */
    @Override
    public void init(XWikiContext context)
    {
        super.init(context);

        this.alwaysUsedExtensions = new HashMap<>();
        getExtensionClass(context);

        Utils.getComponent(ObservationManager.class).addListener(this);
    }

    /**
     * {@inheritDoc}
     *

     * Create/update the XClass corresponding to this kind of extension in this virtual wiki.
     *

     *
     * @see com.xpn.xwiki.plugin.XWikiDefaultPlugin#virtualInit(com.xpn.xwiki.XWikiContext)
     */
    @Override
    public void virtualInit(XWikiContext context)
    {
        super.virtualInit(context);

        getExtensionClass(context);
    }

    /**
     * {@inheritDoc}
     *

     * For this kind of resources, an XObject property ({@code use}) with the value {@code always} indicates always
     * used extensions. The list of extensions for each wiki is lazily placed in a cache: if the extension set for the
     * context wiki is null, then they will be looked up in the database and added to it. The cache is invalidated using
     * the notification mechanism.
     *

     *
     * @see AbstractSkinExtensionPlugin#getAlwaysUsedExtensions(XWikiContext)
     */
    @Override
    public Set<String> getAlwaysUsedExtensions(XWikiContext context)
    {
        EntityReferenceSerializer<String> serializer = Utils.getComponent(EntityReferenceSerializer.TYPE_STRING);
        Set<DocumentReference> references = getAlwaysUsedExtensions();
        Set<String> names = new HashSet<>(references.size());
        for (DocumentReference reference : references) {
            names.add(serializer.serialize(reference));
        }
        return names;
    }

    /**
     * Returns the list of always used extensions of this type as a set of document references. For this kind of
     * resources, an XObject property ({@code use}) with the value {@code always} indicates always used extensions.
     * The list of extensions for each wiki is lazily placed in a cache: if the extension set for the context wiki is
     * null, then they will be looked up in the database and added to it. The cache is invalidated using the
     * notification mechanism. Note that this method is called for each request, as the list might change in time, and
     * it can be different for each wiki in a farm.
     *
     * @return a set of document references that should be pulled in the current response
     */
    public Set<DocumentReference> getAlwaysUsedExtensions()
    {
        XWikiContext context = Utils.getContext();
        // Retrieve the current wiki name from the XWiki context
        String currentWiki = StringUtils.defaultIfEmpty(context.getWikiId(), context.getMainXWiki());
        // If we already have extensions defined for this wiki, we return them
        if (this.alwaysUsedExtensions.get(currentWiki) != null) {
            return this.alwaysUsedExtensions.get(currentWiki);
        } else {
            // Otherwise, we look them up in the database.
            Set<DocumentReference> extensions = new HashSet<>();
            String query =
                ", BaseObject as obj, StringProperty as use where obj.className='" + getExtensionClassName() + "'"
                    + " and obj.name=doc.fullName and use.id.id=obj.id and use.id.name='use' and use.value='always'";
            try {
                for (DocumentReference extension : context.getWiki().getStore()
                    .searchDocumentReferences(query, context)) {
                    try {
                        XWikiDocument doc = context.getWiki().getDocument(extension, context);
                        // Only add the extension as being "always used" if the page holding it has been saved with
                        // programming rights.
                        if (Utils.getComponent(AuthorizationManager.class).hasAccess(Right.PROGRAM,
                            doc.getAuthorReference(), doc.getDocumentReference())) {
                            extensions.add(extension);
                        }
                    } catch (XWikiException e1) {
                        LOGGER.error("Error while adding skin extension [{}] as always used. It will be ignored.",
                            extension, e1);
                    }
                }
                this.alwaysUsedExtensions.put(currentWiki, extensions);
                return extensions;
            } catch (XWikiException e) {
                LOGGER.error("Error while retrieving always used JS extensions", e);
                return Collections.emptySet();
            }
        }
    }

    @Override
    public boolean hasPageExtensions(XWikiContext context)
    {
        XWikiDocument doc = context.getDoc();
        if (doc != null) {
            List<BaseObject> objects = doc.getObjects(getExtensionClassName());
            if (objects != null) {
                for (BaseObject obj : objects) {
                    if (obj == null) {
                        continue;
                    }
                    if (obj.getStringValue(USE_FIELDNAME).equals("currentPage")) {
                        return true;
                    }
                }
            }
        }
        return false;
    }

    @Override
    public void use(String resource, XWikiContext context)
    {
        String canonicalResource = getCanonicalDocumentName(resource);

        super.use(canonicalResource, context);
    }

    @Override
    public void use(String resource, Map<String, Object> parameters, XWikiContext context)
    {
        String canonicalResource = getCanonicalDocumentName(resource);

        super.use(canonicalResource, parameters, context);
    }

    /**
     * {@inheritDoc}
     *

     * We must override this method since the plugin manager only calls it for classes that provide their own
     * implementation, and not an inherited one.
     *

     *
     * @see AbstractSkinExtensionPlugin#endParsing(String, XWikiContext)
     */
    @Override
    public String endParsing(String content, XWikiContext context)
    {
        return super.endParsing(content, context);
    }

    /**
     * Creates or updates the XClass used for this type of extension. Usually called on {@link #init(XWikiContext)} and
     * {@link #virtualInit(XWikiContext)}.
     *
     * @param context The current request context, which gives access to the wiki.
     * @return The XClass for this extension.
     */
    public BaseClass getExtensionClass(XWikiContext context)
    {
        try {
            XWikiDocument doc = context.getWiki().getDocument(getExtensionClassName(), context);

            return doc.getXClass();
        } catch (Exception ex) {
            LOGGER.error("Cannot get skin extension class [{}]", getExtensionClassName(), ex);
        }

        return null;
    }

    /**
     * {@inheritDoc}
     *

     * Make sure to keep the {@link #alwaysUsedExtensions} map consistent when the database changes.
     *
     * @see org.xwiki.observation.EventListener#onEvent(org.xwiki.observation.event.Event, java.lang.Object,
     *      java.lang.Object)
     */
    @Override
    public void onEvent(Event event, Object source, Object data)
    {
        if (event instanceof WikiDeletedEvent) {
            this.alwaysUsedExtensions.remove(((WikiDeletedEvent) event).getWikiId());
        } else {
            onDocumentEvent((XWikiDocument) source);
        }
    }

    /**
     * A document related event has been received.
     *
     * @param document the modified document
     */
    private void onDocumentEvent(XWikiDocument document)
    {
        boolean remove = false;
        if (document.getObject(getExtensionClassName()) != null) {
            // new or already existing object
            if (document.getObject(getExtensionClassName(), USE_FIELDNAME, "always", false) != null) {
                if (Utils.getComponent(AuthorizationManager.class).hasAccess(Right.PROGRAM,
                    document.getAuthorReference(), document.getDocumentReference())) {
                    getAlwaysUsedExtensions().add(document.getDocumentReference());

                    return;
                } else {
                    // in case the extension lost its programming rights upon this save.
                    remove = true;
                }
            } else {
                // remove if exists but use onDemand
                remove = true;
            }
        } else if (document.getOriginalDocument().getObject(getExtensionClassName()) != null) {
            // object removed
            remove = true;
        }

        if (remove) {
            getAlwaysUsedExtensions().remove(document.getDocumentReference());
        }
    }

    /**
     * Get the canonical serialization of a document name, in the {@code wiki:Space.Document} format.
     *
     * @param documentName the original document name to fix
     * @return fixed document name
     */
    private String getCanonicalDocumentName(String documentName)
    {
        @SuppressWarnings("unchecked")
        EntityReferenceResolver<String> resolver = Utils.getComponent(EntityReferenceResolver.TYPE_STRING, "current");
        @SuppressWarnings("unchecked")
        EntityReferenceSerializer<String> serializer = Utils.getComponent(EntityReferenceSerializer.TYPE_STRING);
        return serializer.serialize(resolver.resolve(documentName, EntityType.DOCUMENT));
    }

    /**
     * @param documentName the Skin Extension's document name
     * @param context the XWiki Context
     * @return true if the specified document is accessible (i.e. has view rights) by the current user; false otherwise
     */
    protected boolean isAccessible(String documentName, XWikiContext context)
    {
        return isAccessible(getCurrentDocumentReferenceResolver().resolve(documentName), context);
    }

    /**
     * @param documentReference the Skin Extension's document reference
     * @param context the XWiki Context
     * @return true if the specified document is accessible (i.e. has view rights) by the current user; false otherwise
     * @since 7.4.1
     */
    protected boolean isAccessible(DocumentReference documentReference, XWikiContext context)
    {
        if (!Utils.getComponent(ContextualAuthorizationManager.class).hasAccess(Right.VIEW, documentReference)) {
            LOGGER.debug("[{}] The current user [{}] does not have 'view' rights on the Skin Extension document [{}]",
                getName(), context.getUserReference(), documentReference);

            return false;
        }

        return true;
    }

    /**
     * @param documentReference the Skin Extension's document reference
     * @param context the XWiki Context
     * @return the version of the document
     */
    private String getDocumentVersion(DocumentReference documentReference, XWikiContext context)
    {
        try {
            return context.getWiki().getDocument(documentReference, context).getVersion();
        } catch (XWikiException e) {
            LOGGER.error("Failed to load document [{}].", documentReference, e);
        }
        return "";
    }

    /**
     * Return the query string part with the version of the document, to add to the URL of a resource. The objective is
     * to generate an URL specific to this version to avoid browsers using an outdated version from their cache.
     *
     * @param documentReference the Skin Extension's document reference
     * @param context the XWiki Context
     * @return the query string part handling the version of the document
     */
    private String getDocumentVersionQueryString(DocumentReference documentReference, XWikiContext context)
    {
        return "docVersion=" + sanitize(getDocumentVersion(documentReference, context));
    }

    /**
     * Return the query string part with the language of the document (if any).
     *
     * @param context the XWiki Context
     * @return the query string handling the language of the document
     */
    private String getLanguageQueryString(XWikiContext context)
    {
        Locale locale = context.getLocale();
        if (locale != null) {
            return "language=" + sanitize(locale.toString());
        }
        return "";
    }

    /**
     * Return the URL to a document skin extension.
     *
     * @param documentReference the Skin Extension's document reference
     * @param documentName the Skin Extension's document name
     * @param pluginName the name of the plugin
     * @param context the XWiki Context
     * @return the URL to the document skin extension.
     *
     * @since 7.4.1
     */
    protected String getDocumentSkinExtensionURL(DocumentReference documentReference, String documentName,
            String pluginName, XWikiContext context)
    {
        String queryString = String.format("%s&%s%s",
                getLanguageQueryString(context),
                getDocumentVersionQueryString(documentReference, context),
                parametersAsQueryString(documentName, context));

        return context.getWiki().getURL(documentReference, pluginName, queryString, "", context);
    }
}

## 内容3
### 文件路径：
xwiki-platform-core/xwiki-platform-skin/xwiki-platform-skin-skinx/src/main/java/com/xpn/xwiki/plugin/skinx/AbstractSkinExtensionPlugin.java
### 代码内容：
/*
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package com.xpn.xwiki.plugin.skinx;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Objects;
import java.util.Set;

import org.apache.commons.lang3.BooleanUtils;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xwiki.model.reference.DocumentReferenceResolver;
import org.xwiki.model.reference.EntityReferenceSerializer;
import org.xwiki.skinx.internal.async.SkinExtensionAsync;

import com.xpn.xwiki.XWikiContext;
import com.xpn.xwiki.api.Api;
import com.xpn.xwiki.internal.cache.rendering.CachedItem;
import com.xpn.xwiki.internal.cache.rendering.CachedItem.UsedExtension;
import com.xpn.xwiki.internal.cache.rendering.RenderingCacheAware;
import com.xpn.xwiki.plugin.XWikiDefaultPlugin;
import com.xpn.xwiki.plugin.XWikiPluginInterface;
import com.xpn.xwiki.web.Utils;

/**
 *

 * Skin Extensions base plugin. It allows templates and document content to pull required clientside code in the
 * generated XHTML (or whatever XML) content.
 *

 *

 * The API provides a method {@link SkinExtensionPluginApi#use(String)}, which, when called, marks an extension as used
 * in the current result. Later on, all the used extensions are inserted in the content, by replacing the first
 * occurrence of the following string: {@code }, where the actual extension
 * type classname is used. For example, JS extensions are inserted in place of
 * {@code }.
 *

 *
 * @see SkinExtensionPluginApi
 * @see JsSkinExtensionPlugin
 * @see CssSkinExtensionPlugin
 * @see LinkExtensionPlugin
 * @version $Id$
 */
@SuppressWarnings("deprecation")
public abstract class AbstractSkinExtensionPlugin extends XWikiDefaultPlugin implements RenderingCacheAware
{
    /**
     * The name of the preference (in the configuration file) specifying what is the default value of the defer, in case
     * nothing is specified in the parameters of this extension.
     *
     * @since 14.1RC1
     */
    public static final String DEFER_DEFAULT_PARAM = "xwiki.plugins.skinx.deferred.default";

    /**
     * The URL delimiter part of query parameters.
     *
     * @since 11.6RC1
     * @since 11.3.2
     */
    protected static final String QUERY_PARAMETER_DELIMITER = "?";

    /**
     * The separator between parameters.
     *
     * @since 14.1RC1
     */
    static final String PARAMETER_SEPARATOR = "&";

    /** Log object to log messages in this class. */
    private static final Logger LOGGER = LoggerFactory.getLogger(AbstractSkinExtensionPlugin.class);

    /** Parameter name force skin action. */
    private static final String FORCE_SKIN_ACTION = "forceSkinAction";

    /** The name of the context key for the list of pulled extensions. */
    protected final String contextKey = this.getClass().getCanonicalName();

    /** The name of the context key for the additional parameters for pulled extensions. */
    protected final String parametersContextKey = this.getClass().getCanonicalName() + "_parameters";

    /**
     * @see #getDefaultEntityReferenceSerializer()
     */
    private EntityReferenceSerializer<String> defaultEntityReferenceSerializer;

    /**
     * @see #getCurrentDocumentReferenceResolver()
     */
    private DocumentReferenceResolver<String> currentDocumentReferenceResolver;

    private SkinExtensionAsync async;

    /**
     * XWiki plugin constructor.
     *
     * @param name The name of the plugin, which can be used for retrieving the plugin API from velocity. Unused.
     * @param className The canonical classname of the plugin. Unused.
     * @param context The current request context.
     * @see com.xpn.xwiki.plugin.XWikiDefaultPlugin#XWikiDefaultPlugin(String,String,com.xpn.xwiki.XWikiContext)
     */
    public AbstractSkinExtensionPlugin(String name, String className, XWikiContext context)
    {
        super(name, className, context);
    }

    /**
     * Abstract method for obtaining a link that points to the actual pulled resource. Each type of resource has its own
     * format for the link, for example Javascript uses <script src="/path/to/Document">, while CSS
     * uses <link rel="stylesheet" href="/path/to/Document"> (the actual syntax is longer, this is
     * just a simplified example).
     *
     * @param resource the name of the wiki document holding the resource.
     * @param context the current request context, needed to access the URLFactory.
     * @return A String representation of the linking element that should be printed in the generated HTML.
     */
    public abstract String getLink(String resource, XWikiContext context);

    /**
     * Abstract method for obtaining a link that points to the actual pulled resource. Each type of resource has its own
     * format for the link, for example Javascript uses <script src="/path/to/Document">, while CSS
     * uses <link rel="stylesheet" href="/path/to/Document"> (the actual syntax is longer, this is
     * just a simplified example).
     *
     * @param resource the name of the wiki document holding the resource.
     * @param parameters the parameters associated with the resource.
     * @param context the current request context, needed to access the URLFactory.
     * @return A String representation of the linking element that should be printed in the generated HTML.
     * @since 10.11.9
     * @since 11.3.2
     * @since 11.6RC1
     */
    public String getLink(String resource, Map<String, Object> parameters, XWikiContext context)
    {
        getParametersMap(context).put(resource, parameters);

        return getLink(resource, context);
    }

    /**
     * Returns the list of always used extensions of this type. Which resources are always used depends on the type of
     * resource, for example document based StyleSheet extensions have a property in the object, {@code use}, which can
     * have the value {@code always} to declare that an extension should always be used.
     *
     * @param context The current request context.
     * @return A set of resource names that should be pulled in the current response. Note that this method is called
     *         for each request, as the list might change in time, and it can be different for each wiki in a farm.
     */
    public abstract Set<String> getAlwaysUsedExtensions(XWikiContext context);

    /**
     * Determines if the requested document contains on page skin extension objects of this type. True if at least one
     * of the extension objects has the {@code currentPage} value for the {@code use} property.
     *
     * @param context the current request context
     * @return a boolean specifying if the current document contains on page skin extensions
     */
    public abstract boolean hasPageExtensions(XWikiContext context);

    @Override
    public Api getPluginApi(XWikiPluginInterface plugin, XWikiContext context)
    {
        return new SkinExtensionPluginApi((AbstractSkinExtensionPlugin) plugin, context);
    }

    /**
     * @param filename The name of the file to get the URL for.
     * @param context The current request context.
     * @return The (unescaped) URL of the skin file.
     * @since 14.1RC1
     */
    String getSkinFileURL(String filename, XWikiContext context)
    {
        boolean forceSkinAction = BooleanUtils.toBoolean((Boolean) getParameter(FORCE_SKIN_ACTION, filename,
            context));

        StringBuilder url = new StringBuilder(context.getWiki().getSkinFile(filename, forceSkinAction, context));
        if (forceSkinAction) {
            String parameters =
                StringUtils.removeStart(parametersAsQueryString(filename, context), PARAMETER_SEPARATOR);
            if (!StringUtils.isEmpty(parameters)) {
                String queryParamDelimiter =
                    StringUtils.contains(url, QUERY_PARAMETER_DELIMITER) ? PARAMETER_SEPARATOR
                        : QUERY_PARAMETER_DELIMITER;
                url.append(queryParamDelimiter).append(parameters);
            }
        }

        return url.toString();
    }

    private void useResource(String resource, XWikiContext context)
    {
        LOGGER.debug("Using [{}] as [{}] extension", resource, this.getName());
        getPulledResources(context).add(resource);
    }

    /**
     * Mark a resource as used in the current result. A resource is registered only once per request, further calls will
     * not result in additional links, even if it is pulled with different parameters.
     *
     * @param resource The name of the resource to pull.
     * @param context The current request context.
     * @see #use(String, Map, XWikiContext)
     */
    public void use(String resource, XWikiContext context)
    {
        useResource(resource, context);

        // In case a previous call added some parameters, remove them, since the last call for a resource always
        // discards previous ones.
        getParametersMap(context).remove(resource);

        // Register the use of the resource in case the current execution is an asynchronous renderer
        getSkinExtensionAsync().use(getName(), resource, null);
    }

    /**
     * Mark a skin extension document as used in the current result, together with some parameters. How the parameters
     * are used, depends on the type of resource being pulled. For example, JS and CSS extensions use the parameters in
     * the resulting URL, while Link extensions use the parameters as attributes of the link tag. A resource is
     * registered only once per request, further calls will not result in additional links, even if it is pulled with
     * different parameters. If more than one calls per request are made, the parameters used are the ones from the last
     * call (or none, if the last call did not specify any parameters).
     *
     * @param resource The name of the resource to pull.
     * @param parameters The parameters for this resource.
     * @param context The current request context.
     * @see #use(String, XWikiContext)
     */
    public void use(String resource, Map<String, Object> parameters, XWikiContext context)
    {
        useResource(resource, context);

        // Associate parameters to the resource
        getParametersMap(context).put(resource, parameters);

        getSkinExtensionAsync().use(getName(), resource, parameters);
    }

    /**
     * Get the list of pulled resources (of the plugin's type) for the current request. The returned list is always
     * valid.
     *
     * @param context The current request context.
     * @return A set of names that holds the resources pulled in the current request.
     */
    @SuppressWarnings("unchecked")
    protected Set<String> getPulledResources(XWikiContext context)
    {
        initializeRequestListIfNeeded(context);
        return (Set<String>) context.get(this.contextKey);
    }

    /**
     * Get the map of additional parameters for each pulled resource (of the plugin's type) for the current request. The
     * returned map is always valid.
     *
     * @param context The current request context.
     * @return A map of resource parameters, where the key is the resource's name, and the value is a map holding the
     *         actual parameters for a given resource. If a resource was pulled without additional parameters, then no
     *         corresponding entry is added in this map.
     */
    @SuppressWarnings("unchecked")
    protected Map<String, Map<String, Object>> getParametersMap(XWikiContext context)
    {
        initializeRequestListIfNeeded(context);
        return (Map<String, Map<String, Object>>) context.get(this.parametersContextKey);
    }

    /**
     * Initializes the list of pulled extensions corresponding to this request, if it wasn't already initialized. This
     * method is not thread safe, since a context should not be shared among threads.
     *
     * @param context The current context where this list is stored.
     */
    protected void initializeRequestListIfNeeded(XWikiContext context)
    {
        if (!context.containsKey(this.contextKey)) {
            context.put(this.contextKey, new LinkedHashSet<String>());
        }
        if (!context.containsKey(this.parametersContextKey)) {
            context.put(this.parametersContextKey, new HashMap<String, Map<String, Object>>());
        }
    }

    /**
     * Composes and returns the links to the resources pulled in the current request. This method is called at the end
     * of each request, once for each type of resource (subclass), and the result is placed in the generated XHTML.
     *
     * @param context The current request context.
     * @return a XHMTL fragment with all extensions imports statements for this request. This includes both extensions
     *         that are defined as being "used always" and "on demand" extensions explicitly requested for this page.
     *         Always used extensions are always, before on demand extensions, so that on demand extensions can override
     *         more general elements in the always used ones.
     */
    public String getImportString(XWikiContext context)
    {
        StringBuilder result = new StringBuilder();
        // Using LinkedHashSet to preserve the extensions order.
        Set<String> extensions = new LinkedHashSet<String>();
        // First, we add to the import string the extensions that should always be used.
        // TODO Global extensions should be able to select a set of actions for which they are enabled.
        extensions.addAll(getAlwaysUsedExtensions(context));

        // Then, we add On-Demand extensions for this request.
        extensions.addAll(getPulledResources(context));

        // Add On-Page extensions
        if (hasPageExtensions(context)) {
            // Make sure to use a prefixed document full name for the current document as well, or else the "extensions"
            // set will not detect if it was added before and it will be added twice.
            EntityReferenceSerializer<String> serializer = getDefaultEntityReferenceSerializer();
            String serializedCurrentDocumentName = serializer.serialize(context.getDoc().getDocumentReference());

            // Add it to the list.
            extensions.add(serializedCurrentDocumentName);
        }

        for (String documentName : extensions) {
            result.append(getLink(documentName, context));
        }
        return result.toString();
    }

    /**
     * Get the parameters for a pulled resource. Note that a valid map is always returned, even if no parameters were
     * given when the resource was pulled.
     *
     * @param resource The resource for which to retrieve the parameters.
     * @param context The current request context.
     * @return The parameters for the resource, as a map where the keys are the parameter names, and the values are
     *         corresponding parameter value. If no parameters were given, an empty map is returned.
     */
    protected Map<String, Object> getParametersForResource(String resource, XWikiContext context)
    {
        Map<String, Object> result = getParametersMap(context).get(resource);
        if (result == null) {
            result = Collections.emptyMap();
        }
        return result;
    }

    /**
     * Get a parameter value for a pulled resource.
     *
     * @param parameterName the name of the parameter to retrieve
     * @param resource the resource for which to retrieve the parameter
     * @param context the current request context
     * @return The parameter value for the resource. If this parameter was not given, {@code null} is returned.
     */
    protected Object getParameter(String parameterName, String resource, XWikiContext context)
    {
        return getParametersForResource(resource, context).get(parameterName);
    }

    /**
     * This method converts the parameters for an extension to a query string that can be used with
     * {@link com.xpn.xwiki.doc.XWikiDocument#getURL(String, String, String, XWikiContext) getURL()} and printed in the
     * XHTML result. The parameters separator is the escaped &. The query string already starts with an
     * & if at least one parameter exists.
     *
     * @param resource The pulled resource whose parameters should be converted.
     * @param context The current request context.
     * @return The constructed query string, or an empty string if there are no parameters.
     */
    protected String parametersAsQueryString(String resource, XWikiContext context)
    {
        Map<String, Object> parameters = getParametersForResource(resource, context);
        StringBuilder query = new StringBuilder();
        for (Entry<String, Object> parameter : parameters.entrySet()) {
            // Skip the parameter that forces the file extensions to be sent through the /skin/ action
            if (FORCE_SKIN_ACTION.equals(parameter.getKey())) {
                continue;
            }
            query.append(PARAMETER_SEPARATOR);
            query.append(sanitize(parameter.getKey()));
            query.append("=");
            query.append(sanitize(Objects.toString(parameter.getValue(), "")));
        }
        // If the main page is requested unminified, also send unminified extensions
        if ("false".equals(context.getRequest().getParameter("minify"))) {
            query.append("&minify=false");
        }
        return query.toString();
    }

    /**
     * Prevent "HTML Injection" by making sure the rendered text does not escape the current element. This is achieved
     * by URL-encoding the following characters: '"<>
     *
     * @param value The string to sanitize.
     * @return The unchanged string, if it does not contain special characters, or the empty string.
     */
    protected String sanitize(String value)
    {
        String result = value;
        try {
            result = URLEncoder.encode(value, "UTF-8");
        } catch (UnsupportedEncodingException ex) {
            // Should never happen since the UTF-8 encoding is always available in the platform,
            // see http://java.sun.com/j2se/1.5.0/docs/api/java/nio/charset/Charset.html
        }
        return result;
    }

    /**
     * {@inheritDoc}
     *

     * At the end of the request, insert the links to the pulled resources in the response, in the place marked by an
     * XML comment of the format {@code }.
     *

     *
     * @see com.xpn.xwiki.plugin.XWikiDefaultPlugin#endParsing(String, XWikiContext)
     */
    @Override
    public String endParsing(String content, XWikiContext context)
    {
        // Using an XML comment is pretty safe, as extensions probably wouldn't work in other type
        // of documents, like RTF, CSV or JSON.
        String hook = "";
        String result = content.replaceFirst(hook, getImportString(context));
        return result;
    }

    @Override
    public UsedExtension getCacheResources(XWikiContext context)
    {
        return new CachedItem.UsedExtension(getPulledResources(context),
            new HashMap<String, Map<String, Object>>(getParametersMap(context)));
    }

    @Override
    public void restoreCacheResources(XWikiContext context, UsedExtension extension)
    {
        getPulledResources(context).addAll(extension.resources);
        getParametersMap(context).putAll(extension.parameters);
    }

    /**
     * Used to convert a proper Document Reference to string (standard form).
     */
    protected EntityReferenceSerializer<String> getDefaultEntityReferenceSerializer()
    {
        if (this.defaultEntityReferenceSerializer == null) {
            this.defaultEntityReferenceSerializer = Utils.getComponent(EntityReferenceSerializer.TYPE_STRING);
        }

        return this.defaultEntityReferenceSerializer;
    }

    /**
     * Used to resolve a document string reference to a Document Reference.
     */
    protected DocumentReferenceResolver<String> getCurrentDocumentReferenceResolver()
    {
        if (this.currentDocumentReferenceResolver == null) {
            this.currentDocumentReferenceResolver =
                Utils.getComponent(DocumentReferenceResolver.TYPE_STRING, "current");
        }

        return this.currentDocumentReferenceResolver;
    }

    protected SkinExtensionAsync getSkinExtensionAsync()
    {
        if (this.async == null) {
            this.async = Utils.getComponent(SkinExtensionAsync.class);
        }

        return this.async;
    }

    /**
     * If the loading of given JavaScript script shall be deferred.
     *
     * @param name Name of the script to be loaded (page, file or resource name).
     * @param context The context to get the parameter from.
     * @return If the loading shall be deferred, defaults to the preference in the configuration file, which defaults
     * to true.
     * @since 14.1RC1
     */
    boolean isDefer(String name, XWikiContext context)
    {
        String defaultDeferString = context.getWiki().Param(DEFER_DEFAULT_PARAM);
        boolean defaultDefer = StringUtils.isEmpty(defaultDeferString) || Boolean.parseBoolean(defaultDeferString);
        return BooleanUtils.toBooleanDefaultIfNull((Boolean) getParameter("defer", name, context), defaultDefer);
    }
}

Output:
【漏洞类型】授权管理漏洞
【严重性】High
【漏洞摘要】此代码允许未授权的用户通过`use`方法访问和使用皮肤扩展资源。具体表现为`AbstractDocumentSkinExtensionPlugin`类中的`use`方法，未验证用户是否有SCRIPT权限即可使用资源。根本原因在于，`use`方法仅检查了资源的创建者是否有PROGRAM权限，而未检查当前用户是否有SCRIPT权限。
【关键代码模式】`use`方法、`AuthorizationManager`、`Right.PROGRAM`、`Right.SCRIPT`
【修复方法说明】修复方法通过增加对当前用户的SCRIPT权限验证，确保只有具备相应权限的用户才能使用资源。