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Ant example source code file (VerifyJar.java)

This example Ant source code file (VerifyJar.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Ant tags/keywords

bufferingoutputfilter, bufferingoutputfilterreader, bufferingoutputfilterreader, buildexception, buildexception, fileresource, io, ioexception, reader, reader, string, string, stringbuffer, util, verifying, you

The VerifyJar.java source code

/*
 *  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.tools.ant.taskdefs;

import org.apache.tools.ant.Project;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.filters.ChainableReader;
import org.apache.tools.ant.types.RedirectorElement;
import org.apache.tools.ant.types.FilterChain;
import org.apache.tools.ant.types.Path;
import org.apache.tools.ant.types.resources.FileResource;

import java.util.Iterator;
import java.io.File;
import java.io.Reader;
import java.io.IOException;

/**
 * JAR verification task.
 * For every JAR passed in, we fork jarsigner to verify
 * that it is correctly signed. This is more rigorous than just checking for
 * the existence of a signature; the entire certification chain is tested
 * @since Ant 1.7
 */

public class VerifyJar extends AbstractJarSignerTask {
    /**
     * no file message {@value}
     */
    public static final String ERROR_NO_FILE = "Not found :";

    /**
     * The string we look for in the text to indicate direct verification
     */
    private static final String VERIFIED_TEXT = "jar verified.";

    /**
     * certification flag
     */
    private boolean certificates = false;
    private BufferingOutputFilter outputCache = new BufferingOutputFilter();
    /** Error output if there is a failure to verify the jar. */
    public static final String ERROR_NO_VERIFY = "Failed to verify ";

    /**
     * Ask for certificate information to be printed
     * @param certificates if true print certificates.
     */
    public void setCertificates(boolean certificates) {
        this.certificates = certificates;
    }

    /**
     * verify our jar files
     * @throws BuildException on error.
     */
    public void execute() throws BuildException {
        //validation logic
        final boolean hasJar = jar != null;

        if (!hasJar && !hasResources()) {
            throw new BuildException(ERROR_NO_SOURCE);
        }

        beginExecution();

        //patch the redirector to save output to a file
        RedirectorElement redirector = getRedirector();
        redirector.setAlwaysLog(true);
        FilterChain outputFilterChain = redirector.createOutputFilterChain();
        outputFilterChain.add(outputCache);

        try {
            Path sources = createUnifiedSourcePath();
            Iterator iter = sources.iterator();
            while (iter.hasNext()) {
                FileResource fr = (FileResource) iter.next();
                verifyOneJar(fr.getFile());
            }

        } finally {
            endExecution();
        }

    }

    /**
     * verify a JAR.
     * @param jar the jar to verify.
     * @throws BuildException if the file could not be verified
     */
    private void verifyOneJar(File jar) {
        if (!jar.exists()) {
            throw new BuildException(ERROR_NO_FILE + jar);
        }
        final ExecTask cmd = createJarSigner();

        setCommonOptions(cmd);
        bindToKeystore(cmd);

        //verify special operations
        addValue(cmd, "-verify");

        if (certificates) {
            addValue(cmd, "-certs");
        }

        //JAR  is required
        addValue(cmd, jar.getPath());

        log("Verifying JAR: " + jar.getAbsolutePath());
        outputCache.clear();
        BuildException ex = null;
        try {
            cmd.execute();
        } catch (BuildException e) {
            ex = e;
        }
        String results = outputCache.toString();
        //deal with jdk1.4.2 bug:
        if (ex != null) {
            if (results.indexOf("zip file closed") >= 0) {
                log("You are running " + JARSIGNER_COMMAND + " against a JVM with"
                    + " a known bug that manifests as an IllegalStateException.",
                    Project.MSG_WARN);
            } else {
                throw ex;
            }
        }
        if (results.indexOf(VERIFIED_TEXT) < 0) {
            throw new BuildException(ERROR_NO_VERIFY + jar);
        }
    }

    /**
     * we are not thread safe here. Do not use on multiple threads at the same time.
     */
    private static class BufferingOutputFilter implements ChainableReader {

        private BufferingOutputFilterReader buffer;

        public Reader chain(Reader rdr) {
            buffer = new BufferingOutputFilterReader(rdr);
            return buffer;
        }

        public String toString() {
            return buffer.toString();
        }

        public void clear() {
            if (buffer != null) {
                buffer.clear();
            }
        }
    }

    /**
     * catch the output of the buffer
     */
    private static class BufferingOutputFilterReader extends Reader {

        private Reader next;

        private StringBuffer buffer = new StringBuffer();

        public BufferingOutputFilterReader(Reader next) {
            this.next = next;
        }

        public int read(char[] cbuf, int off, int len) throws IOException {
            //hand down
            int result = next.read(cbuf, off, len);
            //cache
            buffer.append(cbuf, off, len);
            //return
            return result;
        }

        public void close() throws IOException {
            next.close();
        }

        public String toString() {
            return buffer.toString();
        }

        public void clear() {
            buffer = new StringBuffer();
        }
    }
}

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