gnu-social/lib/common.php

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<?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/>.
*/
/* XXX: break up into separate modules (HTTP, HTML, user, files) */
if (!defined('LACONICA')) { exit(1); }
define('AVATAR_PROFILE_SIZE', 96);
define('AVATAR_STREAM_SIZE', 48);
define('AVATAR_MINI_SIZE', 24);
define('MAX_AVATAR_SIZE', 256 * 1024);
# global configuration object
require_once('PEAR.php');
require_once('DB/DataObject.php');
// default configuration, overwritten in config.php
$config =
array('site' =>
array('name' => 'Just another Laconica microblog',
'server' => 'localhost',
'path' => '/'),
'avatar' =>
array('directory' => INSTALLDIR . 'files',
'path' => '/files')
);
$config['db'] = &PEAR::getStaticProperty('DB_DataObject','options');
$config['db'] =
array('database' => 'YOU HAVE TO SET THIS IN config.php',
'schema_location' => $INSTALLDIR . '/classes',
'class_location' => $INSTALLDIR . '/classes',
'require_prefix' => 'classes/',
'class_prefix' => '',
'db_driver' => 'MDB2',
'quote_identifiers' => false);
require_once(INSTALLDIR . '/config.php');
# Show a server error
function common_server_error($msg) {
header('Status: 500 Server Error');
header('Content-type: text/plain');
print $msg;
exit();
}
# Show a user error
function common_user_error($msg, $code=200) {
common_show_header('Error');
common_element('div', array('class' => 'error'), $msg);
common_show_footer();
}
# Start an HTML element
function common_element_start($tag, $attrs=NULL) {
print "<$tag";
if (is_array($attrs)) {
foreach ($attrs as $name => $value) {
print " $name='$value'";
}
} else if (is_string($attrs)) {
print " class='$attrs'";
}
print '>';
}
function common_element_end($tag) {
print "</$tag>";
}
function common_element($tag, $attrs=NULL, $content=NULL) {
common_element_start($tag, $attrs);
if ($content) print htmlspecialchars($content);
common_element_end($tag);
}
function common_show_header($pagetitle) {
global $config;
common_element_start('html');
common_element_start('head');
common_element('title', NULL,
$pagetitle . " - " . $config['site']['name']);
common_element_end('head');
common_element_start('body');
common_head_menu();
}
function common_show_footer() {
common_foot_menu();
common_element_end('body');
common_element_end('html');
}
function common_head_menu() {
$user = common_current_user();
common_element_start('ul', 'headmenu');
common_menu_item(common_local_url('doc', array('title' => 'help')),
_t('Help'));
if ($user) {
common_menu_item(common_local_url('all', array('nickname' =>
$user->nickname)),
_t('Home'));
common_menu_item(common_local_url('showstream', array('nickname' =>
$user->nickname)),
_t('Profile'), $user->fullname || $user->nickname);
common_menu_item(common_local_url('profilesettings'),
_t('Settings'));
common_menu_item(common_local_url('logout'),
_t('Logout'));
} else {
common_menu_item(common_local_url('login'),
_t('Login'));
common_menu_item(common_local_url('register'),
_t('Register'));
}
common_element_end('ul');
}
function common_foot_menu() {
common_element_start('ul', 'footmenu');
common_menu_item(common_local_url('doc', array('title' => 'about')),
_t('About'));
common_menu_item(common_local_url('doc', array('title' => 'help')),
_t('Help'));
common_menu_item(common_local_url('doc', array('title' => 'privacy')),
_t('Privacy'));
}
function common_menu_item($url, $text, $title=NULL) {
$attrs['href'] = $url;
if ($title) {
$attrs['title'] = $title;
}
common_element_start('li', 'menuitem');
common_element('a', $attrs, $text);
common_element_end('li');
}
function common_input($id, $label) {
common_element('label', array('for' => $id), $label);
common_element('input', array('name' => $id,
'type' => 'text',
'id' => $id));
}
# salted, hashed passwords are stored in the DB
function common_munge_password($id, $password) {
return md5($id . $password);
}
# check if a username exists and has matching password
function common_check_user($nickname, $password) {
$user = User::staticGet('nickname', $nickname);
if (is_null($user)) {
return false;
} else {
return (0 == strcmp(common_munge_password($password, $user->id),
$user->password));
}
}
# is the current user logged in?
function common_logged_in() {
return (!is_null(common_current_user()));
}
function common_have_session() {
return (0 != strcmp(session_id(), ''));
}
function common_ensure_session() {
if (!common_have_session()) {
@session_start();
}
}
function common_set_user($nickname) {
if (is_null($nickname) && common_have_session()) {
unset($_SESSION['userid']);
return true;
} else {
$user = User::staticGet('nickname', $nickname);
if ($user) {
common_ensure_session();
$_SESSION['userid'] = $user->id;
return true;
} else {
return false;
}
}
return false;
}
# who is the current user?
function common_current_user() {
static $user = NULL; # FIXME: global memcached
if (is_null($user)) {
if (common_have_session()) {
$id = $_SESSION['userid'];
if ($id) {
$user = User::staticGet($id);
}
}
}
return $user;
}
# get canonical version of nickname for comparison
function common_canonical_nickname($nickname) {
# XXX: UTF-8 canonicalization (like combining chars)
return strtolower($nickname);
}
function common_render_content($text) {
# XXX: @ messages
# XXX: # tags
# XXX: machine tags
return htmlspecialchars($text);
}
// where should the avatar go for this user?
function common_avatar_filename($user, $extension, $size=NULL) {
global $config;
if ($size) {
return $user->id . '-' . $size . $extension;
} else {
return $user->id . '-original' . $extension;
}
}
function common_avatar_path($filename) {
global $config;
return $config['avatar']['directory'] . '/' . $filename;
}
function common_avatar_url($filename) {
global $config;
return $config['avatar']['path'] . '/' . $filename;
}
function common_local_url($action, $args) {
global $config;
/* XXX: pretty URLs */
$extra = '';
foreach ($args as $key => $value) {
$extra .= "&${key}=${value}";
}
return "http://".$config['site']['server'].'/'.$config['site']['path']."/index.php?action=${action}${extra}";
}
function commmon_date_string($dt) {
// XXX: do some sexy date formatting
return date(DATE_RFC822);
}
function common_redirect($url, $code=307) {
static $status = array(301 => "Moved Permanently",
302 => "Found",
303 => "See Other",
307 => "Temporary Redirect");
header("Status: ${code} $status[$code]");
header("Location: $url");
common_element('a', array('href' => $url), $url);
}
function common_broadcast_notices($id) {
// XXX: broadcast notices to remote subscribers
// XXX: broadcast notices to SMS
// XXX: broadcast notices to Jabber
// XXX: broadcast notices to other IM
// XXX: use a queue system like http://code.google.com/p/microapps/wiki/NQDQ
return true;
}
// XXX: set up gettext
function _t($str) {
return $str;
}