/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache license, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the license for the specific language governing permissions and
 * limitations under the license.
 */
package org.apache.logging.log4j.web;
// Please note that if you move this class, make sure to update the Interpolator class (if still applicable) or remove
// this comment if no longer relevant

import javax.servlet.ServletContext;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.config.plugins.Plugin;
import org.apache.logging.log4j.core.impl.ContextAnchor;
import org.apache.logging.log4j.core.lookup.AbstractLookup;
import org.apache.logging.log4j.spi.LoggerContext;

@Plugin(name = "web", category = "Lookup")
public class WebLookup extends AbstractLookup {
    private static final String ATTR_PREFIX = "attr.";
    private static final String INIT_PARAM_PREFIX = "initParam.";

    protected ServletContext getServletContext() {
        LoggerContext lc = ContextAnchor.THREAD_CONTEXT.get();
        if (lc == null) {
            lc = LogManager.getContext(false);
        }
        if (lc != null) {
            final Object obj = lc.getExternalContext();
            return obj != null && obj instanceof ServletContext ? (ServletContext) obj : null;
        }
        return null;
    }

    @Override
    public String lookup(final LogEvent event, final String key) {
        final ServletContext ctx = getServletContext();
        if (ctx == null) {
            return null;
        }

        if (key.startsWith(ATTR_PREFIX)) {
            final String attrName = key.substring(ATTR_PREFIX.length());
            final Object attrValue = ctx.getAttribute(attrName);
            return attrValue == null ? null : attrValue.toString();
        }

        if (key.startsWith(INIT_PARAM_PREFIX)) {
            final String paramName = key.substring(INIT_PARAM_PREFIX.length());
            return ctx.getInitParameter(paramName);
        }

        if ("rootDir".equals(key)) {
            final String root = ctx.getRealPath("/");
            if (root == null) {
                final String msg = "Failed to resolve web:rootDir -- " +
                        "servlet container unable to translate virtual path " +
                        " to real path (probably not deployed as exploded";
                throw new IllegalStateException(msg);
            }
            return root;
        }

        if ("contextPath".equals(key)) {
            return ctx.getContextPath();
        }

        if ("servletContextName".equals(key)) {
            return ctx.getServletContextName();
        }

        if ("serverInfo".equals(key)) {
            return ctx.getServerInfo();
        }

        if ("effectiveMajorVersion".equals(key)) {
            return String.valueOf(ctx.getEffectiveMajorVersion());
        }

        if ("effectiveMinorVersion".equals(key)) {
            return String.valueOf(ctx.getEffectiveMinorVersion());
        }

        if ("majorVersion".equals(key)) {
            return String.valueOf(ctx.getMajorVersion());
        }

        if ("minorVersion".equals(key)) {
            return String.valueOf(ctx.getMinorVersion());
        }

        if (ctx.getAttribute(key) != null) {
            return ctx.getAttribute(key).toString();
        }

        if (ctx.getInitParameter(key) != null) {
            return ctx.getInitParameter(key);
        }

        ctx.log(getClass().getName() + " unable to resolve key '" + key + '\'');
        return null;
    }
}

@@ -1032,52 +1032,8 @@
 t;%0A%0A
-import org.apache.logging.log4j.LogManager;%0A
 impo
@@ -1139,65 +1139,8 @@
 in;%0A
-import org.apache.logging.log4j.core.impl.ContextAnchor;%0A
 impo
@@ -1198,59 +1198,8 @@
 kup;
-%0Aimport org.apache.logging.log4j.spi.LoggerContext;
 %0A%0A@P
@@ -1417,33 +1417,64 @@
     
+/**%0A     * @de
 pr
-ot
 ec
+a
 ted 
-Servlet
+Use %7B@link WebLogger
 Context
- 
+Utils#
 getS
@@ -1492,228 +1492,74 @@
 xt()
- %7B
+%7D.
 %0A     
-   LoggerContext lc = ContextAnchor.THREAD_CONTEXT.get();%0A        if (lc == null) %7B%0A            lc = LogManager.getContext(false);%0A        %7D%0A        if (lc != null) %7B%0A            final Object obj = lc.getExternal
+*/%0A    @Deprecated%0A    protected ServletContext getServlet
 Cont
@@ -1559,30 +1559,27 @@
 letContext()
-;%0A    
+ %7B%0A
         retu
@@ -1585,113 +1585,49 @@
 urn 
-obj != null && obj instanceof ServletContext ? (ServletContext) obj : null;%0A        %7D%0A        return null
+WebLoggerContextUtils.getServletContext()
 ;%0A  
@@ -1747,16 +1747,38 @@
 t ctx = 
+WebLoggerContextUtils.
 getServl

Use WebLoggerContextUtils.getServletContext().