<?php
/**
 * StatusNet - the distributed open-source microblogging tool
 * Copyright (C) 2008, 2009, StatusNet, 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/>.
 *
 * @category StatusNet
 * @package  StatusNet
 * @author   Brenda Wallace <shiny@cpan.org>
 * @author   Brion Vibber <brion@pobox.com>
 * @author   Christopher Vollick <psycotica0@gmail.com>
 * @author   CiaranG <ciaran@ciarang.com>
 * @author   Craig Andrews <candrews@integralblue.com>
 * @author   Evan Prodromou <evan@controlezvous.ca>
 * @author   Gina Haeussge <osd@foosel.net>
 * @author   James Walker <walkah@walkah.net>
 * @author   Jeffery To <jeffery.to@gmail.com>
 * @author   Mike Cochrane <mikec@mikenz.geek.nz>
 * @author   Robin Millette <millette@controlyourself.ca>
 * @author   Sarven Capadisli <csarven@controlyourself.ca>
 * @author   Tom Adams <tom@holizz.com>
 * @author   Zach Copley <zach@status.net>
 * @copyright 2009 Free Software Foundation, Inc http://www.fsf.org
 *
 * @license  GNU Affero General Public License http://www.gnu.org/licenses/
 */

define('INSTALLDIR', dirname(__FILE__));
define('GNUSOCIAL', true);
define('STATUSNET', true);
define('LACONICA', true); // compatibility

function getPath($req)
{
    if ((common_config('site', 'fancy') || !array_key_exists('PATH_INFO', $_SERVER))
        && array_key_exists('p', $req)
    ) {
        return $req['p'];
    } else if (array_key_exists('PATH_INFO', $_SERVER)) {
        $path = $_SERVER['PATH_INFO'];
        $script = $_SERVER['SCRIPT_NAME'];
        if (substr($path, 0, mb_strlen($script)) == $script) {
            return substr($path, mb_strlen($script));
        } else {
            return $path;
        }
    } else {
        return null;
    }
}

/**
 * logs and then displays error messages
 *
 * @return void
 */
function handleError($error)
{
    try {

        if ($error->getCode() == DB_DATAOBJECT_ERROR_NODATA) {
            return;
        }

        $logmsg = "PEAR error: " . $error->getMessage();
        if ($error instanceof PEAR_Exception && common_config('site', 'logdebug')) {
            $logmsg .= " : ". $error->toText();
        }
        // DB queries often end up with a lot of newlines; merge to a single line
        // for easier grepability...
        $logmsg = str_replace("\n", " ", $logmsg);
        common_log(LOG_ERR, $logmsg);

        // @fixme backtrace output should be consistent with exception handling
        if (common_config('site', 'logdebug')) {
            $bt = $error->getTrace();
            foreach ($bt as $n => $line) {
                common_log(LOG_ERR, formatBacktraceLine($n, $line));
            }
        }
        if ($error instanceof DB_DataObject_Error
            || $error instanceof DB_Error
            || ($error instanceof PEAR_Exception && $error->getCode() == -24)
        ) {
            //If we run into a DB error, assume we can't connect to the DB at all
            //so set the current user to null, so we don't try to access the DB
            //while rendering the error page.
            global $_cur;
            $_cur = null;

            $msg = sprintf(
                _(
                    'The database for %s isn\'t responding correctly, '.
                    'so the site won\'t work properly. '.
                    'The site admins probably know about the problem, '.
                    'but you can contact them at %s to make sure. '.
                    'Otherwise, wait a few minutes and try again.'
                ),
                common_config('site', 'name'),
                common_config('site', 'email')
            );
        } else {
            $msg = _(
                'An important error occured, probably related to email setup. '.
                'Check logfiles for more info..'
            );
        }

        $dac = new DBErrorAction($msg, 500);
        $dac->showPage();

    } catch (Exception $e) {
        echo _('An error occurred.');
    }
    exit(-1);
}

set_exception_handler('handleError');

require_once INSTALLDIR . '/lib/common.php';

/**
 * Format a backtrace line for debug output roughly like debug_print_backtrace() does.
 * Exceptions already have this built in, but PEAR error objects just give us the array.
 *
 * @param int $n line number
 * @param array $line per-frame array item from debug_backtrace()
 * @return string
 */
function formatBacktraceLine($n, $line)
{
    $out = "#$n ";
    if (isset($line['class'])) $out .= $line['class'];
    if (isset($line['type'])) $out .= $line['type'];
    if (isset($line['function'])) $out .= $line['function'];
    $out .= '(';
    if (isset($line['args'])) {
        $args = array();
        foreach ($line['args'] as $arg) {
            // debug_print_backtrace seems to use var_export
            // but this gets *very* verbose!
            $args[] = gettype($arg);
        }
        $out .= implode(',', $args);
    }
    $out .= ')';
    $out .= ' called at [';
    if (isset($line['file'])) $out .= $line['file'];
    if (isset($line['line'])) $out .= ':' . $line['line'];
    $out .= ']';
    return $out;
}

function setupRW()
{
    global $config;

    static $alwaysRW = array('session', 'remember_me');

    // We ensure that these tables always are used
    // on the master DB

    $config['db']['database_rw'] = $config['db']['database'];
    $config['db']['ini_rw'] = INSTALLDIR.'/classes/statusnet.ini';

    foreach ($alwaysRW as $table) {
        $config['db']['table_'.$table] = 'rw';
    }
}

function checkMirror($action_obj, $args)
{
    global $config;

    if (common_config('db', 'mirror') && $action_obj->isReadOnly($args)) {
        if (is_array(common_config('db', 'mirror'))) {
            // "load balancing", ha ha
            $arr = common_config('db', 'mirror');
            $k = array_rand($arr);
            $mirror = $arr[$k];
        } else {
            $mirror = common_config('db', 'mirror');
        }

        // everyone else uses the mirror

        $config['db']['database'] = $mirror;
    }
}

function isLoginAction($action)
{
    static $loginActions =  array('login', 'recoverpassword', 'api', 'doc', 'register', 'publicxrds', 'otp', 'opensearch', 'rsd');

    $login = null;

    if (Event::handle('LoginAction', array($action, &$login))) {
        $login = in_array($action, $loginActions);
    }

    return $login;
}