gnu-social/lib/action.php

<?php
/**
 * Laconica - a distributed open-source microblogging tool
 * Copyright (C) 2008, Controlez-Vous, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

if (!defined('LACONICA')) {
    exit(1);
}

class Action // lawsuit
{

    var $args;

    function Action()
    {
    }

    // For initializing members of the class

    function prepare($argarray)
    {
        $this->args =& common_copy_args($argarray);
        return true;
    }

    // For comparison with If-Last-Modified
    // If not applicable, return null

    function last_modified()
    {
        return null;
    }

    function etag()
    {
        return null;
    }

    function is_readonly()
    {
        return false;
    }

    function arg($key, $def=null)
    {
        if (array_key_exists($key, $this->args)) {
            return $this->args[$key];
        } else {
            return $def;
        }
    }

    function trimmed($key, $def=null)
    {
        $arg = $this->arg($key, $def);
        return (is_string($arg)) ? trim($arg) : $arg;
    }

    // Note: argarray ignored, since it's now passed in in prepare()

    function handle($argarray=null)
    {

        $lm = $this->last_modified();
        $etag = $this->etag();

        if ($etag) {
            header('ETag: ' . $etag);
        }

        if ($lm) {
            header('Last-Modified: ' . date(DATE_RFC1123, $lm));
            $if_modified_since = $_SERVER['HTTP_IF_MODIFIED_SINCE'];
            if ($if_modified_since) {
                $ims = strtotime($if_modified_since);
                if ($lm <= $ims) {
                    if (!$etag ||
                        $this->_has_etag($etag, $_SERVER['HTTP_IF_NONE_MATCH'])) {
                        header('HTTP/1.1 304 Not Modified');
                        // Better way to do this?
                        exit(0);
                    }
                }
            }
        }
    }

    function _has_etag($etag, $if_none_match)
    {
        return ($if_none_match) && in_array($etag, explode(',', $if_none_match));
    }

    function boolean($key, $def=false)
    {
        $arg = strtolower($this->trimmed($key));

        if (is_null($arg)) {
            return $def;
        } else if (in_array($arg, array('true', 'yes', '1'))) {
            return true;
        } else if (in_array($arg, array('false', 'no', '0'))) {
            return false;
        } else {
            return $def;
        }
    }

    function server_error($msg, $code=500)
    {
        $action = $this->trimmed('action');
        common_debug("Server error '$code' on '$action': $msg", __FILE__);
        common_server_error($msg, $code);
    }

    function client_error($msg, $code=400)
    {
        $action = $this->trimmed('action');
        common_debug("User error '$code' on '$action': $msg", __FILE__);
        common_user_error($msg, $code);
    }

    function self_url()
    {
        $action = $this->trimmed('action');
        $args = $this->args;
        unset($args['action']);
        foreach (array_keys($_COOKIE) as $cookie) {
            unset($args[$cookie]);
        }
        return common_local_url($action, $args);
    }

    function nav_menu($menu)
    {
        $action = $this->trimmed('action');
        common_element_start('ul', array('id' => 'nav_views'));
        foreach ($menu as $menuaction => $menudesc) {
            common_menu_item(common_local_url($menuaction,
                                              isset($menudesc[2]) ? $menudesc[2] : null),
                             $menudesc[0],
                             $menudesc[1],
                             $action == $menuaction);
        }
        common_element_end('ul');
    }
}