SquirrelJME/SquirrelJME

// -*- Mode: Java; indent-tabs-mode: t; tab-width: 4 -*-
// ---------------------------------------------------------------------------
// Multi-Phasic Applications: SquirrelJME
//     Copyright (C) Stephanie Gawroriski <xer@multiphasicapps.net>
// ---------------------------------------------------------------------------
// SquirrelJME is under the GNU General Public License v3+, or later.
// See license.mkd for licensing and copyright information.
// ---------------------------------------------------------------------------

package cc.squirreljme.runtime.nttdocomo.io;

import cc.squirreljme.jvm.mle.JarPackageShelf;
import cc.squirreljme.jvm.mle.brackets.JarPackageBracket;
import cc.squirreljme.runtime.cldc.annotation.SquirrelJMEVendorApi;
import cc.squirreljme.runtime.cldc.debug.Debugging;
import cc.squirreljme.runtime.gcf.FileAddress;
import java.io.IOException;
import java.io.InputStream;

/**
 * This acts as a virtual web root HTTP server that is used for DoJa based
 * titles to access their web based resources and otherwise. Since these titles
 * themselves have content on a remote server end, this allows that to still
 * run accordingly.
 * 
 * This will keep HTTP state accordingly and also handle any potential CGI
 * requests for any files that should be served over CGI for example.
 * 
 * Software expects this to be HTTP compatible accordingly.
 *
 * @since 2022/10/07
 */
@SquirrelJMEVendorApi
public class SquirrelJMEWebRootManager
{
    /** The JAR that makes up our webroot. */
    @SquirrelJMEVendorApi
    protected final JarPackageBracket jar;
    
    /**
     * Initializes the web root.
     * 
     * @param __jar The JAR that makes up the web root.
     * @throws NullPointerException On null arguments.
     * @since 2022/10/11
     */
    @SquirrelJMEVendorApi
    public SquirrelJMEWebRootManager(JarPackageBracket __jar)
        throws NullPointerException
    {
        if (__jar == null)
            throw new NullPointerException("NARG");
        
        this.jar = __jar;
    }
    
    /**
     * Checks whether the given path exists within the virtual webroot.
     * 
     * @param __file The file to check.
     * @return If the path exists in the virtual webroot.
     * @throws IOException On read errors.
     * @throws NullPointerException On null arguments.
     * @since 2022/10/11
     */
    @SquirrelJMEVendorApi
    public boolean pathExists(FileAddress __file)
        throws IOException, NullPointerException
    {
        if (__file == null)
            throw new NullPointerException("NARG");
        
        // Remove all starting slashes
        String jarPath = __file.toString();
        while (jarPath.startsWith("/"))
            jarPath = jarPath.substring(1);
        
        // Debug
        Debugging.debugNote("pathExists(%s) -> %s", __file, jarPath);
        
        // If the path is blank, it always exists and likely leads to an index
        if (jarPath.isEmpty())
            return true;
        
        // Look within the JAR for the resource by attempting to open it, it
        // will exist if the stream is not null
        try (InputStream in = JarPackageShelf.openResource(this.jar, jarPath))
        {
            return in != null;
        }
    }
}