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An Ant task for building Getdown app distributions
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//
// Getdown - application installer, patcher and launcher
// Copyright (C) 2004-2018 Getdown authors
// https://github.com/threerings/getdown/blob/master/LICENSE

package com.threerings.getdown.tools;

import java.io.File;
import java.io.IOException;
import java.security.GeneralSecurityException;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;

/**
 * An ant task used to create a {@code digest.txt} for a Getdown
 * application deployment.
 */
public class DigesterTask extends Task
{
    /**
     * Sets the application directory.
     */
    public void setAppdir (File appdir)
    {
        _appdir = appdir;
    }

    /**
     * Sets the digest signing keystore.
     */
    public void setKeystore (File path)
    {
        _storepath = path;
    }

    /**
     * Sets the keystore decryption key.
     */
    public void setStorepass (String password)
    {
        _storepass = password;
    }

    /**
     * Sets the private key alias.
     */
    public void setAlias (String alias)
    {
        _storealias = alias;
    }

    /**
     * Performs the actual work of the task.
     */
    @Override
    public void execute () throws BuildException
    {
        // make sure appdir is set
        if (_appdir == null) {
            throw new BuildException("Must specify the path to the application directory " +
                                     "via the 'appdir' attribute.");
        }

        // make sure _storepass and _keyalias are set, if _storepath is set
        if (_storepath != null && (_storepass == null || _storealias == null)) {
            throw new BuildException(
                    "Must specify both a keystore password and a private key alias.");
        }

        try {
            Digester.createDigests(_appdir, _storepath, _storepass, _storealias);
        } catch (IOException ioe) {
            throw new BuildException("Error creating digest: " + ioe.getMessage(), ioe);
        } catch (GeneralSecurityException gse) {
            throw new BuildException("Error creating signature: " + gse.getMessage(), gse);
        }
    }

    /** The application directory in which we're creating a digest file. */
    protected File _appdir;

    /** The path to the keystore we'll use to sign the digest file, if any. */
    protected File _storepath;

    /** The decryption key for the keystore. */
    protected String _storepass;

    /** The private key alias. */
    protected String _storealias;
}