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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2013 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
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 * file that accompanied this code.
 *
 * Modifications:
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 * enclosed by brackets [] replaced by your own identifying information:
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 * and therefore, elected the GPL Version 2 license, then the option applies
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 * holder.
 *
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 * permission notice:
 *
 * Copyright 2004 The Apache Software Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
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// Portions Copyright [2019] Payara Foundation and/or affiliates

package org.apache.catalina.ssi;


import org.apache.catalina.util.IOTools;
import org.glassfish.web.util.HtmlEntityEncoder;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
/**
 * Implements the Server-side #exec command
 * 
 * @author Bip Thelin
 * @author Amy Roh
 * @author Paul Speed
 * @author Dan Sandberg
 * @author David Becker
 * @version $Revision: 1.4 $, $Date: 2007/05/05 05:32:19 $
 */
public class SSIExec implements SSICommand {
    protected SSIInclude ssiInclude;
    protected final static int BUFFER_SIZE = 1024;

    public SSIExec() {
        this.ssiInclude = new SSIInclude();
    }

    /**
     * @see SSICommand
     */
    @Override
    public long process(SSIMediator ssiMediator, String commandName,
            String[] paramNames, String[] paramValues, PrintWriter writer) {
        long lastModified = 0;
        String configErrMsg = ssiMediator.getConfigErrMsg();
        String paramName = paramNames[0];
        String paramValue = paramValues[0];
        String substitutedValue = ssiMediator.substituteVariables(paramValue);
        if (paramName.equalsIgnoreCase("cgi")) {
            lastModified = ssiInclude.process(ssiMediator, "include",
                    			new String[]{"virtual"}, new String[]{substitutedValue},
								writer);
        } else if (paramName.equalsIgnoreCase("cmd")) {
            boolean foundProgram = false;
            try {
                Runtime rt = Runtime.getRuntime();
                Process proc = rt.exec(substitutedValue);
                foundProgram = true;
                BufferedReader stdOutReader = new BufferedReader(
                        new InputStreamReader(proc.getInputStream()));
                BufferedReader stdErrReader = new BufferedReader(
                        new InputStreamReader(proc.getErrorStream()));
                char[] buf = new char[BUFFER_SIZE];
                IOTools.flow(stdErrReader, writer, buf);
                IOTools.flow(stdOutReader, writer, buf);
                proc.waitFor();
                lastModified = System.currentTimeMillis();                
            } catch (InterruptedException e) {
                ssiMediator.log("Couldn't exec file: " + substitutedValue, e);
                writer.write(HtmlEntityEncoder.encodeXSS(configErrMsg));
            } catch (IOException e) {
                //if (!foundProgram) {
                    //apache doesn't output an error message if it can't find
                    // a program
                //}
                ssiMediator.log("Couldn't exec file: " + substitutedValue, e);
            }
        }
        return lastModified;
    }
}