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/*
 * 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.catalina.webresources;

import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.Manifest;

import org.apache.catalina.LifecycleException;
import org.apache.catalina.WebResource;
import org.apache.catalina.WebResourceRoot;
import org.apache.tomcat.util.buf.UriUtil;

/**
 * Represents a {@link org.apache.catalina.WebResourceSet} based on a JAR file.
 */
public class JarResourceSet extends AbstractArchiveResourceSet {

    /**
     * A no argument constructor is required for this to work with the digester.
     */
    public JarResourceSet() {
    }

    /**
     * Creates a new {@link org.apache.catalina.WebResourceSet} based on a JAR
     * file.
     *
     * @param root          The {@link WebResourceRoot} this new
     *                          {@link org.apache.catalina.WebResourceSet} will
     *                          be added to.
     * @param webAppMount   The path within the web application at which this
     *                          {@link org.apache.catalina.WebResourceSet} will
     *                          be mounted.
     * @param base          The absolute path to the JAR file on the file system
     *                          from which the resources will be served.
     * @param internalPath  The path within this new {@link
     *                          org.apache.catalina.WebResourceSet} where
     *                          resources will be served from. E.g. for a
     *                          resource JAR, this would be "META-INF/resources"
     *
     * @throws IllegalArgumentException if the webAppMount or internalPath is
     *         not valid (valid paths must start with '/')
     */
    public JarResourceSet(WebResourceRoot root, String webAppMount, String base,
            String internalPath) throws IllegalArgumentException {
        setRoot(root);
        setWebAppMount(webAppMount);
        setBase(base);
        setInternalPath(internalPath);

        if (getRoot().getState().isAvailable()) {
            try {
                start();
            } catch (LifecycleException e) {
                throw new IllegalStateException(e);
            }
        }
    }

    @Override
    protected WebResource createArchiveResource(JarEntry jarEntry,
            String webAppPath, Manifest manifest) {
        return new JarResource(this, webAppPath, getBaseUrlString(), jarEntry);
    }


    @Override
    protected HashMap getArchiveEntries(boolean single) {
        synchronized (archiveLock) {
            if (archiveEntries == null && !single) {
                JarFile jarFile = null;
                archiveEntries = new HashMap<>();
                try {
                    jarFile = openJarFile();
                    Enumeration entries = jarFile.entries();
                    while (entries.hasMoreElements()) {
                        JarEntry entry = entries.nextElement();
                        archiveEntries.put(entry.getName(), entry);
                    }
                } catch (IOException ioe) {
                    // Should never happen
                    archiveEntries = null;
                    throw new IllegalStateException(ioe);
                } finally {
                    if (jarFile != null) {
                        closeJarFile();
                    }
                }
            }
            return archiveEntries;
        }
    }


    @Override
    protected JarEntry getArchiveEntry(String pathInArchive) {
        JarFile jarFile = null;
        try {
            jarFile = openJarFile();
            return jarFile.getJarEntry(pathInArchive);
        } catch (IOException ioe) {
            // Should never happen
            throw new IllegalStateException(ioe);
        } finally {
            if (jarFile != null) {
                closeJarFile();
            }
        }
    }


    //-------------------------------------------------------- Lifecycle methods
    @Override
    protected void initInternal() throws LifecycleException {

        try (JarFile jarFile = new JarFile(getBase())) {
            setManifest(jarFile.getManifest());
        } catch (IOException ioe) {
            throw new IllegalArgumentException(ioe);
        }

        try {
            setBaseUrl(UriUtil.buildJarSafeUrl(new File(getBase())));
        } catch (MalformedURLException e) {
            throw new IllegalArgumentException(e);
        }
    }
}