gnu-social/lib/theme.php

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<?php
/**
* StatusNet, the distributed open-source microblogging tool
*
* Utilities for theme files and paths
*
* PHP version 5
*
* LICENCE: 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 Paths
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @author Sarven Capadisli <csarven@status.net>
* @copyright 2008-2009 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
*/
if (!defined('STATUSNET') && !defined('LACONICA')) {
exit(1);
}
/**
* Class for querying and manipulating a theme
*
* Themes are directories with some expected sub-directories and files
* in them. They're found in either local/theme (for locally-installed themes)
* or theme/ subdir of installation dir.
*
* Note that the 'local' directory can be overridden as $config['local']['path']
* and $config['local']['dir'] etc.
*
* This used to be a couple of functions, but for various reasons it's nice
* to have a class instead.
*
* @category Output
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://status.net/
*/
class Theme
{
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const FALLBACK = 'neo';
var $name = null;
var $dir = null;
var $path = null;
protected $metadata = null; // access via getMetadata() lazy-loader
protected $externals = null;
protected $deps = null;
/**
* Constructor
*
* Determines the proper directory and path for this theme.
*
* @param string $name Name of the theme; defaults to config value
*/
function __construct($name=null)
{
if (empty($name)) {
$name = common_config('site', 'theme');
}
if (!self::validName($name)) {
// TRANS: Server exception displayed if a theme name was invalid.
throw new ServerException(_('Invalid theme name.'));
}
$this->name = $name;
// Check to see if it's in the local dir
$localroot = self::localRoot();
$fulldir = $localroot.'/'.$name;
if (file_exists($fulldir) && is_dir($fulldir)) {
$this->dir = $fulldir;
$this->path = $this->relativeThemePath('local', 'local', 'theme/' . $name);
return;
}
// Check to see if it's in the distribution dir
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$instroot = self::installRoot();
$fulldir = $instroot.'/'.$name;
if (file_exists($fulldir) && is_dir($fulldir)) {
$this->dir = $fulldir;
$this->path = $this->relativeThemePath('theme', 'theme', $name);
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return;
}
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// Ruh roh. Fall back to default, then.
common_log(LOG_WARN, sprintf("Unable to find theme '%s', falling back to default theme '%s'",
$name,
Theme::FALLBACK));
$this->name = Theme::FALLBACK;
$this->dir = $instroot.'/'.Theme::FALLBACK;
$this->path = $this->relativeThemePath('theme', 'theme', Theme::FALLBACK);
}
/**
* Build a full URL to the given theme's base directory, possibly
* using an offsite theme server path.
*
* @param string $group configuration section name to pull paths from
* @param string $fallbackSubdir default subdirectory under INSTALLDIR
* @param string $name theme name
*
* @return string URL
*
* @todo consolidate code with that for other customizable paths
*/
protected function relativeThemePath($group, $fallbackSubdir, $name)
{
if (StatusNet::isHTTPS()) {
$sslserver = common_config($group, 'sslserver');
if (empty($sslserver)) {
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if (is_string(common_config('site', 'sslserver')) &&
mb_strlen(common_config('site', 'sslserver')) > 0) {
$server = common_config('site', 'sslserver');
} else if (common_config('site', 'server')) {
$server = common_config('site', 'server');
}
$path = common_config('site', 'path') . '/';
if ($fallbackSubdir) {
$path .= $fallbackSubdir . '/';
}
} else {
$server = $sslserver;
$path = common_config($group, 'sslpath');
if (empty($path)) {
$path = common_config($group, 'path');
}
}
$protocol = 'https';
} else {
$path = common_config($group, 'path');
if (empty($path)) {
$path = common_config('site', 'path') . '/';
if ($fallbackSubdir) {
$path .= $fallbackSubdir . '/';
}
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}
$server = common_config($group, 'server');
if (empty($server)) {
$server = common_config('site', 'server');
}
$protocol = 'http';
}
if ($path[strlen($path)-1] != '/') {
$path .= '/';
}
if ($path[0] != '/') {
$path = '/'.$path;
}
return $protocol.'://'.$server.$path.$name;
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}
/**
* Gets the full local filename of a file in this theme.
*
* @param string $relative relative name, like 'logo.png'
*
* @return string full pathname, like /var/www/mublog/theme/default/logo.png
*/
function getFile($relative)
{
return $this->dir.'/'.$relative;
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}
/**
* Gets the full HTTP url of a file in this theme
*
* @param string $relative relative name, like 'logo.png'
*
* @return string full URL, like 'http://example.com/theme/default/logo.png'
*/
function getPath($relative)
{
return $this->path.'/'.$relative;
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}
/**
* Fetch a list of other themes whose CSS needs to be pulled in before
* this theme's, based on following the theme.ini 'include' settings.
* (May be empty if this theme has no include dependencies.)
*
* @return array of strings with theme names
*/
function getDeps()
{
if ($this->deps === null) {
$chain = $this->doGetDeps(array($this->name));
array_pop($chain); // Drop us back off
$this->deps = $chain;
}
return $this->deps;
}
protected function doGetDeps($chain)
{
$data = $this->getMetadata();
if (!empty($data['include'])) {
$include = $data['include'];
// Protect against cycles!
if (!in_array($include, $chain)) {
try {
$theme = new Theme($include);
array_unshift($chain, $include);
return $theme->doGetDeps($chain);
} catch (Exception $e) {
common_log(LOG_ERR,
"Exception while fetching theme dependencies " .
"for $this->name: " . $e->getMessage());
}
}
}
return $chain;
}
/**
* Pull data from the theme's theme.ini file.
* @fixme calling getFile will fall back to default theme, this may be unsafe.
*
* @return associative array of strings
*/
function getMetadata()
{
if ($this->metadata == null) {
$this->metadata = $this->doGetMetadata();
}
return $this->metadata;
}
/**
* Pull data from the theme's theme.ini file.
* @fixme calling getFile will fall back to default theme, this may be unsafe.
*
* @return associative array of strings
*/
private function doGetMetadata()
{
$iniFile = $this->getFile('theme.ini');
if (file_exists($iniFile)) {
return parse_ini_file($iniFile);
} else {
return array();
}
}
/**
* Get list of any external URLs required by this theme and any
* dependencies. These are lazy-loaded from theme.ini.
*
* @return array of URL strings
*/
function getExternals()
{
if ($this->externals == null) {
$data = $this->getMetadata();
if (!empty($data['external'])) {
$ext = (array)$data['external'];
} else {
$ext = array();
}
if (!empty($data['include'])) {
$theme = new Theme($data['include']);
$ext = array_merge($ext, $theme->getExternals());
}
$this->externals = array_unique($ext);
}
return $this->externals;
}
/**
* Gets the full path of a file in a theme dir based on its relative name
*
* @param string $relative relative path within the theme directory
* @param string $name name of the theme; defaults to current theme
*
* @return string File path to the theme file
*/
static function file($relative, $name=null)
{
$theme = new Theme($name);
return $theme->getFile($relative);
}
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/**
* Gets the full URL of a file in a theme dir based on its relative name
*
* @param string $relative relative path within the theme directory
* @param string $name name of the theme; defaults to current theme
*
* @return string URL of the file
*/
static function path($relative, $name=null)
{
$theme = new Theme($name);
return $theme->getPath($relative);
}
/**
* list available theme names
*
* @return array list of available theme names
*/
static function listAvailable()
{
$local = self::subdirsOf(self::localRoot());
$install = self::subdirsOf(self::installRoot());
$i = array_search('base', $install);
unset($install[$i]);
return array_merge($local, $install);
}
/**
* Utility for getting subdirs of a directory
*
* @param string $dir full path to directory to check
*
* @return array relative filenames of subdirs, or empty array
*/
protected static function subdirsOf($dir)
{
$subdirs = array();
if (is_dir($dir)) {
if ($dh = opendir($dir)) {
while (($filename = readdir($dh)) !== false) {
if ($filename != '..' && $filename !== '.' &&
is_dir($dir.'/'.$filename)) {
$subdirs[] = $filename;
}
}
closedir($dh);
}
}
return $subdirs;
}
/**
* Local root dir for themes
*
* @return string local root dir for themes
*/
protected static function localRoot()
{
$basedir = common_config('local', 'dir');
if (empty($basedir)) {
$basedir = INSTALLDIR . '/local';
}
return $basedir . '/theme';
}
/**
* Root dir for themes that are shipped with StatusNet
*
* @return string root dir for StatusNet themes
*/
protected static function installRoot()
{
$instroot = common_config('theme', 'dir');
if (empty($instroot)) {
$instroot = INSTALLDIR.'/theme';
}
return $instroot;
}
static function validName($name)
{
return preg_match('/^[a-z0-9][a-z0-9_-]*$/i', $name);
}
}