<?php

/**
 * This static publisher can be used to deploy static content to multiple
 * hosts, by generating the cache files locally and then rsyncing then to
 * each destination box.  This can be used to set up a load-balanced
 * collection of static servers.
 *
 * @package staticpublisher
 */
class RsyncMultiHostPublisher extends FilesystemPublisher
{

    /**
     * @config
     *
     * Array of rsync targets to publish to.  These can either be local
     * file names, or scp-style targets, in the form "user@server:path"
     *
     * @var array
     */
    private static $targets = array();
    
    /**
     * @config
     *
     * @var array
     */
    private static $excluded_folders = array();
    
    /**
     * Set the targets to publish to.
     *
     * If target is an scp-style remote path, no password is accepted - we
     * assume key-based authentication to be set up on the application server
     * initiating the publication.
     *
     * @deprecated  3.2 Use the "RsyncMultiHostPublisher.targets" config setting instead
     *
     * @param $targets An array of targets to publish to.  
     */
    public static function set_targets($targets)
    {
        Deprecation::notice('3.2', 'Use the "RsyncMultiHostPublisher.targets" config setting instead');

        Config::inst()->update('RsyncMultiHostPublisher', 'targets', $targets);
    }
    
    /**
     * Specify folders to exclude from the rsync
     * For example, you could exclude assets.
     *
     * @deprecated  3.2 Use the "RsyncMultiHostPublisher.excluded_folders" config setting instead
     */
    public static function set_excluded_folders($folders)
    {
        Deprecation::notice('3.2', 'Use the "RsyncMultiHostPublisher.excluded_folders" config setting instead');

        Config::inst()->update('RsyncMultiHostPublisher', 'excluded_folders', $folders);
    }

    public function publishPages($urls)
    {
        parent::publishPages($urls);
        $base = Director::baseFolder();
        $framework = FRAMEWORK_DIR;

        // Get variable that can turn off the rsync component of publication 
        if (isset($_GET['norsync']) && $_GET['norsync']) {
            return;
        }
        
        $extraArg = "";
        $excludedFolders = Config::inst()->get('RsyncMultiHostPublisher', 'excluded_folders');
        if ($excludedFolders) {
            foreach ($excludedFolders as $folder) {
                $extraArg .= " --exclude " . escapeshellarg($folder);
            }
        }
        
        $targets = Config::inst()->get('RsyncMultiHostPublisher', 'targets');
        foreach ((array)$targets as $target) {
            // Transfer non-PHP content from everything to the target; that will ensure that we have all the JS/CSS/etc
            $rsyncOutput = `cd $base; rsync -av -e ssh --exclude /.htaccess --exclude /web.config --exclude '*.php' --exclude '*.svn' --exclude '*.git' --exclude '*~' $extraArg --delete . $target`;
            // Then transfer "safe" PHP from the cache/ directory
            $rsyncOutput .= `cd $base; rsync -av -e ssh --exclude '*.svn' --exclude '*~' $extraArg --delete cache $target`;
            // Transfer framework/static-main.php to the target
            $rsyncOutput .= `cd $base; rsync -av -e ssh --delete $framework/static-main.php $target/$framework`;
            
            if (Config::inst()->get('StaticPublisher', 'echo_progress')) {
                echo $rsyncOutput;
            }
        }
    }
}