gnu-social/lib/util.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) */
# 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();
}
$xw = null;
# Start an HTML element
function common_element_start($tag, $attrs=NULL) {
global $xw;
$xw->startElement($tag);
if (is_array($attrs)) {
foreach ($attrs as $name => $value) {
$xw->writeAttribute($name, $value);
}
} else if (is_string($attrs)) {
$xw->writeAttribute('class', $attrs);
}
}
function common_element_end($tag) {
global $xw;
$xw->endElement();
}
function common_element($tag, $attrs=NULL, $content=NULL) {
common_element_start($tag, $attrs);
if ($content) {
global $xw;
$xw->text($content);
}
common_element_end($tag);
}
function common_start_xml($doc=NULL, $public=NULL, $system=NULL) {
global $xw;
$xw = new XMLWriter();
$xw->openURI('php://output');
$xw->setIndent(true);
$xw->startDocument('1.0', 'UTF-8');
if ($doc) {
$xw->writeDTD($doc, $public, $system);
}
}
function common_end_xml() {
global $xw;
$xw->endDocument();
$xw->flush();
}
function common_show_header($pagetitle, $callable=NULL, $data=NULL) {
global $config, $xw;
header('Content-Type: application/xhtml+xml');
common_start_xml('html',
'-//W3C//DTD XHTML 1.0 Strict//EN',
'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd');
# FIXME: correct language for interface
common_element_start('html', array('xmlns' => 'http://www.w3.org/1999/xhtml',
'xml:lang' => 'en',
'lang' => 'en'));
common_element_start('head');
common_element('title', NULL,
$pagetitle . " - " . $config['site']['name']);
common_element('link', array('rel' => 'stylesheet',
'type' => 'text/css',
'href' => $config['site']['path'] . 'theme/default/style/html.css',
'media' => 'screen, projection, tv'));
common_element('link', array('rel' => 'stylesheet',
'type' => 'text/css',
'href' => $config['site']['path'] . 'theme/default/style/layout.css',
'media' => 'screen, projection, tv'));
common_element('link', array('rel' => 'stylesheet',
'type' => 'text/css',
'href' => $config['site']['path'] . 'theme/default/style/print.css',
'media' => 'print'));
if ($callable) {
if ($data) {
call_user_func($callable, $data);
} else {
call_user_func($callable);
}
}
common_element_end('head');
common_element_start('body');
common_element_start('div', array('id' => 'wrapper'));
common_element_start('div', array('id' => 'content'));
common_element_start('div', array('id' => 'header'));
common_element('h1', 'title', $pagetitle);
common_element('h2', 'subtitle', $config['site']['name']);
common_element_end('div');
common_head_menu();
common_element_start('div', array('id' => 'page'));
}
function common_show_footer() {
global $xw, $config;
common_element_start('div', 'footer');
common_foot_menu();
common_license_block();
common_element_end('div');
common_element_end('div');
common_element_end('div');
common_element_end('div');
common_element_end('body');
common_element_end('html');
common_end_xml();
}
function common_text($txt) {
global $xw;
$xw->text($txt);
}
function common_raw($xml) {
global $xw;
$xw->writeRaw($xml);
}
function common_license_block() {
global $config, $xw;
common_element_start('p', 'license greenBg');
common_element_start('span', 'floatLeft width25');
common_element_start('a', array('class' => 'license',
'rel' => 'license',
href => $config['license']['url']));
common_element('img', array('class' => 'license',
'src' => $config['license']['image'],
'alt' => $config['license']['title']));
common_element_end('a');
common_element_end('span');
common_element_start('span', 'floatRight width75');
common_text(_t('Unless otherwise specified, contents of this site are copyright by the contributors and available under the '));
common_element('a', array('class' => 'license',
'rel' => 'license',
href => $config['license']['url']),
$config['license']['title']);
common_text(_t('. Contributors should be attributed by full name or nickname.'));
common_element_end('span');
common_element_end('p');
}
function common_head_menu() {
$user = common_current_user();
common_element_start('ul', array('id' => 'menu', 'class' => ($user) ? 'five' : 'three'));
common_menu_item(common_local_url('public'), _t('Public'));
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 || $user->nickname);
common_menu_item(common_local_url('profilesettings'),
_t('Settings'));
common_menu_item(common_local_url('logout'),
_t('Logout'));
} else {
common_menu_item(common_local_url('login'),
_t('Login'));
common_menu_item(common_local_url('register'),
_t('Register'));
}
common_element_end('ul');
}
function common_foot_menu() {
common_element_start('ul', 'footmenu menuish');
common_menu_item(common_local_url('doc', array('title' => 'about')),
_t('About'));
common_menu_item(common_local_url('doc', array('title' => 'help')),
_t('Help'));
common_menu_item(common_local_url('doc', array('title' => 'privacy')),
_t('Privacy'));
common_menu_item(common_local_url('doc', array('title' => 'source')),
_t('Source'));
common_element_end('ul');
}
function common_menu_item($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, $value=NULL) {
common_element_start('p');
common_element('label', array('for' => $id), $label);
$attrs = array('name' => $id,
'type' => 'text',
'id' => $id);
if ($value) {
$attrs['value'] = htmlspecialchars($value);
}
common_element('input', $attrs);
common_element_end('p');
}
function common_password($id, $label) {
common_element_start('p');
common_element('label', array('for' => $id), $label);
$attrs = array('name' => $id,
'type' => 'password',
'id' => $id);
common_element('input', $attrs);
common_element_end('p');
}
function common_submit($id, $label) {
global $xw;
common_element_start('p');
common_element_start('label', array('for' => $id));
$xw->writeRaw('&nbsp;');
common_element_end('label');
common_element('input', array('type' => 'submit',
'id' => $id,
'name' => $id,
'value' => $label,
'class' => 'button'));
common_element_end('p');
}
function common_textarea($id, $label, $content=NULL) {
common_element_start('p');
common_element('label', array('for' => $id), $label);
common_element('textarea', array('rows' => 3,
'cols' => 40,
'name' => $id,
'id' => $id,
'class' => 'width50'),
($content) ? $content : ' ');
common_element_end('p');
}
# salted, hashed passwords are stored in the DB
function common_munge_password($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)) {
common_ensure_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 $nickname;
}
# get canonical version of email for comparison
function common_canonical_email($email) {
# XXX: canonicalize UTF-8
# XXX: lcase the domain part
return $email;
}
define('URL_REGEX', '^|[ \t\r\n])((ftp|http|https|gopher|mailto|news|nntp|telnet|wais|file|prospero|aim|webcal):(([A-Za-z0-9$_.+!*(),;/?:@&~=-])|%[A-Fa-f0-9]{2}){2,}(#([a-zA-Z0-9][a-zA-Z0-9$_.+!*(),;/?:@&~=%-]*))?([A-Za-z0-9$_+!*();/?:~-]))');
function common_render_content($text, $notice) {
$r = htmlspecialchars($text);
$id = $notice->profile_id;
$r = preg_replace('@https?://\S+@', '<a href="\0" class="extlink">\0</a>', $r);
$r = preg_replace('/(^|\b)@([\w-]+)($|\b)/e', "'\\1@'.common_at_link($id, '\\2').'\\3'", $r);
# XXX: # tags
# XXX: machine tags
return $r;
}
function common_at_link($sender_id, $nickname) {
# Try to find profiles this profile is subscribed to that have this nickname
$recipient = new Profile();
# XXX: chokety and bad
$recipient->whereAdd('EXISTS (SELECT subscribed from subscription where subscriber = '.$sender_id.' and subscribed = id)', 'AND');
$recipient->whereAdd('nickname = "' . trim($nickname) . '"', 'AND');
if ($recipient->find(TRUE)) {
return '<a href="'.htmlspecialchars($recipient->profileurl).'" class="atlink tolistenee">'.$nickname.'</a>';
}
# Try to find profiles that listen to this profile and that have this nickname
$recipient = new Profile();
# XXX: chokety and bad
$recipient->whereAdd('EXISTS (SELECT subscriber from subscription where subscribed = '.$sender_id.' and subscriber = id)', 'AND');
$recipient->whereAdd('nickname = "' . trim($nickname) . '"', 'AND');
if ($recipient->find(TRUE)) {
return '<a href="'.htmlspecialchars($recipient->profileurl).'" class="atlink tolistener">'.$nickname.'</a>';
}
# If this is a local user, try to find a local user with that nickname.
$sender = User::staticGet($sender_id);
if ($sender) {
$recipient_user = User::staticGet('nickname', $nickname);
if ($recipient_user) {
$recipient = $recipient->getProfile();
return '<a href="'.htmlspecialchars($recipient->profileurl).'" class="atlink usertouser">'.$nickname.'</a>';
}
}
# Otherwise, no links. @messages from local users to remote users,
# or from remote users to other remote users, are just
# outside our ability to make intelligent guesses about
return $nickname;
}
// where should the avatar go for this user?
function common_avatar_filename($user, $extension, $size=NULL, $extra=NULL) {
global $config;
if ($size) {
return $user->id . '-' . $size . (($extra) ? ('-' . $extra) : '') . $extension;
} else {
return $user->id . '-original' . (($extra) ? ('-' . $extra) : '') . $extension;
}
}
function common_avatar_path($filename) {
global $config;
return $config['avatar']['directory'] . '/' . $filename;
}
function common_avatar_url($filename) {
global $config;
return "http://".$config['site']['server'].$config['avatar']['path'].'/'.$filename;
}
function common_default_avatar($size) {
static $sizenames = array(AVATAR_PROFILE_SIZE => 'profile',
AVATAR_STREAM_SIZE => 'stream',
AVATAR_MINI_SIZE => 'mini');
global $config;
return "http://".$config['site']['server'].$config['site']['path'].'/'.$config['avatar']['default'][$sizenames[$size]];
}
function common_local_url($action, $args=NULL) {
global $config;
/* XXX: pretty URLs */
$extra = '';
if ($args) {
foreach ($args as $key => $value) {
$extra .= "&${key}=${value}";
}
}
$pathpart = ($config['site']['path']) ? $config['site']['path']."/" : '';
return "http://".$config['site']['server'].'/'.$pathpart."index.php?action=${action}${extra}";
}
function common_date_string($dt) {
// XXX: do some sexy date formatting
// return date(DATE_RFC822, $dt);
return $dt;
}
function common_date_w3dtf($dt) {
$t = strtotime($dt);
return date(DATE_W3C, $t);
}
function common_redirect($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), $url);
}
function common_broadcast_notice($notice) {
// 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;
}
function common_profile_url($nickname) {
return common_local_url('showstream', array('nickname' => $nickname));
}
function common_notice_form() {
common_element_start('form', array('id' => 'newnotice', 'method' => 'POST',
'action' => common_local_url('newnotice')));
common_textarea('noticecontent', _t('What\'s up?'));
common_submit('submit', _t('Send'));
common_element_end('form');
}
function common_mint_tag($extra) {
global $config;
return
'tag:'.$config['tag']['authority'].','.
$config['tag']['date'].':'.$config['tag']['prefix'].$extra;
}
# Should make up a reasonable root URL
function common_root_url() {
global $config;
$pathpart = ($config['site']['path']) ? $config['site']['path']."/" : '';
return "http://".$config['site']['server'].'/'.$pathpart;
}
# returns $bytes bytes of random data as a hexadecimal string
# "good" here is a goal and not a guarantee
function common_good_rand($bytes) {
# XXX: use random.org...?
if (file_exists('/dev/urandom')) {
return common_urandom($bytes);
} else { # FIXME: this is probably not good enough
return common_mtrand($bytes);
}
}
function common_urandom($bytes) {
$h = fopen('/dev/urandom', 'rb');
# should not block
$src = fread($h, $bytes);
fclose($h);
$enc = '';
for ($i = 0; $i < $bytes; $i++) {
$enc .= sprintf("%02x", (ord($src[$i])));
}
return $enc;
}
function common_mtrand($bytes) {
$enc = '';
for ($i = 0; $i < $bytes; $i++) {
$enc .= sprintf("%02x", mt_rand(0, 255));
}
return $enc;
}
function common_timestamp() {
return date('YmdHis');
}
// XXX: set up gettext
function _t($str) {
return $str;
}