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Ant example source code file (GenerateKey.java)

This example Ant source code file (GenerateKey.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

buildexception, buildexception, distinguishedname, dnameparam, dnameparam, exectask, it, numberformatexception, string, string, stringbuffer, stringbuffer, util, validity, vector

The GenerateKey.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 java.util.Enumeration;
import java.util.Vector;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.types.Commandline;
import org.apache.tools.ant.util.JavaEnvUtils;

/**
 * Generates a key in a keystore.
 *
 * @since Ant 1.2
 *
 * @ant.task name="genkey" category="java"
 */
public class GenerateKey extends Task {

    /**
     * A DistinguishedName parameter.
     * This is a nested element in a dname nested element.
     */
    public static class DnameParam {
        private String name;
        private String value;

        /**
         * Set the name attribute.
         * @param name a <code>String value
         */
        public void setName(String name) {
            this.name = name;
        }

        /**
         * Get the name attribute.
         * @return the name.
         */
        public String getName() {
            return name;
        }

        /**
         * Set the value attribute.
         * @param value a <code>String value
         */
        public void setValue(String value) {
            this.value = value;
        }

        /**
         * Get the value attribute.
         * @return the value.
         */
        public String getValue() {
            return value;
        }
    }

    /**
     * A class corresponding to the dname nested element.
     */
    public static class DistinguishedName {
        private Vector params = new Vector();

        /**
         * Create a param nested element.
         * @return a DnameParam object to be configured.
         */
        public Object createParam() {
            DnameParam param = new DnameParam();
            params.addElement(param);

            return param;
        }

        /**
         * Get the nested parameters.
         * @return an enumeration of the nested parameters.
         */
        public Enumeration getParams() {
            return params.elements();
        }

        /**
         * Generate a string rep of this distinguished name.
         * The format is each of the parameters (name = value)
         * separated by ','.
         * This is used on the command line.
         * @return a string rep of this name
         */
        public String toString() {
            final int size = params.size();
            final StringBuffer sb = new StringBuffer();
            boolean firstPass = true;

            for (int i = 0; i < size; i++) {
                if (!firstPass) {
                    sb.append(" ,");
                }
                firstPass = false;

                final DnameParam param = (DnameParam) params.elementAt(i);
                sb.append(encode(param.getName()));
                sb.append('=');
                sb.append(encode(param.getValue()));
            }

            return sb.toString();
        }

        /**
         * Encode a name or value.
         * The encoded result is the same as the input string
         * except that each ',' is replaced by a '\,'.
         * @param string the value to be encoded
         * @return the encoded value.
         */
        public String encode(final String string) {
            int end = string.indexOf(',');

            if (-1 == end) {
              return string;
            }

            final StringBuffer sb = new StringBuffer();

            int start = 0;

            while (-1 != end) {
                sb.append(string.substring(start, end));
                sb.append("\\,");
                start = end + 1;
                end = string.indexOf(',', start);
            }

            sb.append(string.substring(start));

            return sb.toString();
        }
    }

    // CheckStyle:VisibilityModifier OFF - bc

    /**
     * The alias of signer.
     */
    protected String alias;

    /**
     * The name of keystore file.
     */
    protected String keystore;
    protected String storepass;
    protected String storetype;
    protected String keypass;

    protected String sigalg;
    protected String keyalg;
    protected String dname;
    protected DistinguishedName expandedDname;
    protected int keysize;
    protected int validity;
    protected boolean verbose;
    // CheckStyle:VisibilityModifier ON

    /**
     * Distinguished name list.
     *
     * @return Distinguished name container.
     * @throws BuildException If specified more than once or dname
     *                        attribute is used.
     */
    public DistinguishedName createDname() throws BuildException {
        if (null != expandedDname) {
            throw new BuildException("DName sub-element can only be "
                                     + "specified once.");
        }
        if (null != dname) {
            throw new BuildException("It is not possible to specify dname "
                                    + " both as attribute and element.");
        }
        expandedDname = new DistinguishedName();
        return expandedDname;
    }

    /**
     * The distinguished name for entity.
     *
     * @param dname distinguished name
     */
    public void setDname(final String dname) {
        if (null != expandedDname) {
            throw new BuildException("It is not possible to specify dname "
                                    + " both as attribute and element.");
        }
        this.dname = dname;
    }

    /**
     * The alias to add under.
     *
     * @param alias alias to add under
     */
    public void setAlias(final String alias) {
        this.alias = alias;
    }

    /**
     * Keystore location.
     *
     * @param keystore location
     */
    public void setKeystore(final String keystore) {
        this.keystore = keystore;
    }

    /**
     * Password for keystore integrity.
     * Must be at least 6 characters long.
     * @param storepass password
     */
    public void setStorepass(final String storepass) {
        this.storepass = storepass;
    }

    /**
     * Keystore type.
     *
     * @param storetype type
     */
    public void setStoretype(final String storetype) {
        this.storetype = storetype;
    }

    /**
     * Password for private key (if different).
     *
     * @param keypass password
     */
    public void setKeypass(final String keypass) {
        this.keypass = keypass;
    }

    /**
     * The algorithm to use in signing.
     *
     * @param sigalg algorithm
     */
    public void setSigalg(final String sigalg) {
        this.sigalg = sigalg;
    }

    /**
     * The method to use when generating name-value pair.
     * @param keyalg algorithm
     */
    public void setKeyalg(final String keyalg) {
        this.keyalg = keyalg;
    }

    /**
     * Indicates the size of key generated.
     *
     * @param keysize size of key
     * @throws BuildException If not an Integer
     * @todo Could convert this to a plain Integer setter.
     */
    public void setKeysize(final String keysize) throws BuildException {
        try {
            this.keysize = Integer.parseInt(keysize);
        } catch (final NumberFormatException nfe) {
            throw new BuildException("KeySize attribute should be a integer");
        }
    }

    /**
     * Indicates how many days certificate is valid.
     *
     * @param validity days valid
     * @throws BuildException If not an Integer
     */
    public void setValidity(final String validity) throws BuildException {
        try {
            this.validity = Integer.parseInt(validity);
        } catch (final NumberFormatException nfe) {
            throw new BuildException("Validity attribute should be a integer");
        }
    }

    /**
     * If true, verbose output when signing.
     * @param verbose verbose or not
     */
    public void setVerbose(final boolean verbose) {
        this.verbose = verbose;
    }

    /**
     * Execute the task.
     * @throws BuildException on error
     */
    public void execute() throws BuildException {

        if (null == alias) {
            throw new BuildException("alias attribute must be set");
        }

        if (null == storepass) {
            throw new BuildException("storepass attribute must be set");
        }

        if (null == dname && null == expandedDname) {
            throw new BuildException("dname must be set");
        }

        final StringBuffer sb = new StringBuffer();

        sb.append("-genkey ");

        if (verbose) {
            sb.append("-v ");
        }

        sb.append("-alias \"");
        sb.append(alias);
        sb.append("\" ");

        if (null != dname) {
            sb.append("-dname \"");
            sb.append(dname);
            sb.append("\" ");
        }

        if (null != expandedDname) {
            sb.append("-dname \"");
            sb.append(expandedDname);
            sb.append("\" ");
        }

        if (null != keystore) {
            sb.append("-keystore \"");
            sb.append(keystore);
            sb.append("\" ");
        }

        if (null != storepass) {
            sb.append("-storepass \"");
            sb.append(storepass);
            sb.append("\" ");
        }

        if (null != storetype) {
            sb.append("-storetype \"");
            sb.append(storetype);
            sb.append("\" ");
        }

        sb.append("-keypass \"");
        if (null != keypass) {
            sb.append(keypass);
        } else {
            sb.append(storepass);
        }
        sb.append("\" ");

        if (null != sigalg) {
            sb.append("-sigalg \"");
            sb.append(sigalg);
            sb.append("\" ");
        }

        if (null != keyalg) {
            sb.append("-keyalg \"");
            sb.append(keyalg);
            sb.append("\" ");
        }


        if (0 < keysize) {
            sb.append("-keysize \"");
            sb.append(keysize);
            sb.append("\" ");
        }

        if (0 < validity) {
            sb.append("-validity \"");
            sb.append(validity);
            sb.append("\" ");
        }

        log("Generating Key for " + alias);
        final ExecTask cmd = new ExecTask(this);
        cmd.setExecutable(JavaEnvUtils.getJdkExecutable("keytool"));
        Commandline.Argument arg = cmd.createArg();
        arg.setLine(sb.toString());
        cmd.setFailonerror(true);
        cmd.setTaskName(getTaskName());
        cmd.execute();
    }
}

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