Файл: library/XenForo/CssOutput.php
Строк: 418
<?php
/**
* Class to output CSS data quickly for public facing pages. This class
* is not designed to be used with the MVC structure; this allows us to
* significantly reduce the amount of overhead in a request.
*
* This class is entirely self sufficient. It handles parsing the input,
* getting the data, rendering it, and manipulating HTTP headers.
*
* @package XenForo_CssOutput
*/
class XenForo_CssOutput
{
/**
* Style ID the CSS will be retrieved from.
*
* @var integer
*/
protected $_styleId = 0;
/**
* Array of CSS templates that have been requested. These will have ".css" appended
* to them and requested as templates.
*
* @var array
*/
protected $_cssRequested = array();
/**
* The timestamp of the last modification, according to the input. (Used to compare
* to If-Modified-Since header.)
*
* @var integer
*/
protected $_inputModifiedDate = 0;
/**
* The direction in which text should be rendered. Either ltr or rtl.
*
* @var string
*/
protected $_textDirection = 'LTR';
/**
* Date of the last modification to the style. Used to output Last-Modified header.
*
* @var integer
*/
protected $_styleModifiedDate = 0;
/**
* List of user display styles to write out username CSS.
*
* @var array
*/
protected $_displayStyles = array();
/**
* List of smilie sprite styles to write out sprite CSS.
*
* @var array
*/
protected $_smilieSprites = array();
/**
* Constructor.
*
* @param array $input Array of input. Style and CSS will be pulled from this.
*/
public function __construct(array $input)
{
$this->parseInput($input);
}
/**
* Parses the style ID and the list of CSS out of the specified array of input.
* The style ID will be found in "style" and CSS list in "css". The CSS should be
* comma-delimited.
*
* @param array $input
*/
public function parseInput(array $input)
{
$this->_styleId = isset($input['style']) ? intval($input['style']) : 0;
if (!empty($input['css']))
{
$css = is_scalar($input['css']) ? strval($input['css']) : '';
if (preg_match('/./u', $css))
{
$this->_cssRequested = explode(',', $css);
}
}
if (!empty($input['d']))
{
$this->_inputModifiedDate = intval($input['d']);
}
if (!empty($input['dir']) && is_string($input['dir']) && strtoupper($input['dir']) == 'RTL')
{
$this->_textDirection = 'RTL';
}
}
public function handleIfModifiedSinceHeader(array $server)
{
$outputCss = true;
if (isset($server['HTTP_IF_MODIFIED_SINCE']))
{
$modDate = strtotime($server['HTTP_IF_MODIFIED_SINCE']);
if ($modDate !== false && $this->_inputModifiedDate <= $modDate)
{
header('Content-type: text/css; charset=utf-8', true, 304);
$outputCss = false;
}
}
return $outputCss;
}
/**
* Does any preparations necessary for outputting to be done.
*/
protected function _prepareForOutput()
{
$this->_displayStyles = XenForo_Application::get('displayStyles');
$styles = XenForo_Application::get('styles');
$smilieSprites = XenForo_Model::create('XenForo_Model_DataRegistry')->get('smilieSprites');
if (is_array($smilieSprites))
{
$this->_smilieSprites = $smilieSprites;
}
if ($this->_styleId && isset($styles[$this->_styleId]))
{
$style = $styles[$this->_styleId];
}
else
{
$style = reset($styles);
}
if ($style)
{
$properties = unserialize($style['properties']);
$this->_styleId = $style['style_id'];
$this->_styleModifiedDate = $style['last_modified_date'];
}
else
{
$properties = array();
$this->_styleId = 0;
}
$defaultProperties = XenForo_Application::get('defaultStyleProperties');
XenForo_Template_Helper_Core::setStyleProperties(XenForo_Application::mapMerge($defaultProperties, $properties), false);
XenForo_Template_Public::setStyleId($this->_styleId);
XenForo_Template_Abstract::setLanguageId(0);
}
/**
* Renders the CSS and returns it.
*
* @return string
*/
public function renderCss()
{
$cacheId = 'xfCssCache_' . sha1(
'style=' . $this->_styleId .
'css=' . serialize($this->_cssRequested) .
'd=' . $this->_inputModifiedDate .
'dir=' . $this->_textDirection .
'minify=' . XenForo_Application::get('options')->minifyCss)
. (XenForo_Application::debugMode() ? 'debug' : '');
if ($cacheObject = XenForo_Application::getCache())
{
if ($cacheCss = $cacheObject->load($cacheId, true))
{
return $cacheCss . "n/* CSS returned from cache. */";
}
}
$this->_prepareForOutput();
if (XenForo_Application::isRegistered('bbCode'))
{
$bbCodeCache = XenForo_Application::get('bbCode');
}
else
{
$bbCodeCache = XenForo_Model::create('XenForo_Model_BbCode')->getBbCodeCache();
}
$params = array(
'displayStyles' => $this->_displayStyles,
'smilieSprites' => $this->_smilieSprites,
'customBbCodes' => !empty($bbCodeCache['bbCodes']) ? $bbCodeCache['bbCodes'] : array(),
'xenOptions' => XenForo_Application::get('options')->getOptions(),
'dir' => $this->_textDirection,
'pageIsRtl' => ($this->_textDirection == 'RTL')
);
$templates = array();
foreach ($this->_cssRequested AS $cssName)
{
$cssName = trim($cssName);
if (!$cssName)
{
continue;
}
$templateName = $cssName . '.css';
if (!isset($templates[$templateName]))
{
$templates[$templateName] = new XenForo_Template_Public($templateName, $params);
}
}
$css = self::renderCssFromObjects($templates, XenForo_Application::debugMode());
$css = self::prepareCssForOutput(
$css,
$this->_textDirection,
(XenForo_Application::get('options')->minifyCss && $cacheObject)
);
if ($cacheObject)
{
$cacheObject->save($css, $cacheId, array(), 86400);
}
return $css;
}
public static function prepareCssForOutput($css, $direction, $minify = false)
{
$css = self::translateCssRules($css);
if ($direction == 'RTL')
{
$css = XenForo_Template_Helper_RightToLeft::getRtlCss($css);
}
$css = preg_replace('/rtl-raw.([a-zA-Z0-9-]+s*:)/', '$1', $css);
if ($minify)
{
$css = Minify_CSS_Compressor::process($css);
}
return $css;
}
/**
* Renders the CSS from a collection of Template objects.
*
* @param array $templates Array of XenForo_Template_Abstract objects
* @param boolean $withDebug If true, output debug CSS when invalid properties are accessed
*
* @return string
*/
public static function renderCssFromObjects(array $templates, $withDebug = false)
{
$errors = array();
$output = '@CHARSET "UTF-8";' . "n";
foreach ($templates AS $templateName => $template)
{
if ($withDebug)
{
XenForo_Template_Helper_Core::resetInvalidStylePropertyAccessList();
}
$rendered = $template->render();
if ($rendered !== '')
{
$output .= "n/* --- " . str_replace('*/', '', $templateName) . " --- */nn$renderedn";
}
if ($withDebug)
{
$propertyError = self::createDebugErrorString(
XenForo_Template_Helper_Core::getInvalidStylePropertyAccessList()
);
if ($propertyError)
{
$errors["$templateName"] = $propertyError;
}
}
}
if ($withDebug && $errors)
{
$output .= self::getDebugErrorsAsCss($errors);
}
return $output;
}
/**
* Translates CSS rules for use by current browsers.
*
* @param string $output
*
* @return string
*/
public static function translateCssRules($output)
{
/**
* CSS3 temporary attributes translation.
* Some browsers implement custom attributes that refer to a future spec.
* This takes the (assumed) future attribute and translates it into
* browser-specific tags, so the CSS can be up to date with browser changes.
*
* @var array CSS translators: key = pattern to find, value = replacement pattern
*/
$cssTranslate = array(
// border/outline-radius
'/(?<=[^a-z0-9-])(border|outline)((-)(top|bottom)(-)(right|left))?-radiuss*:(s*)([^ ;}][^;}]*)s*(?=;|})/siU'
=> '-webkit-13456-radius:78;'
. ' -moz-1-radius346:78;'
. ' -khtml-13456-radius:78;'
. ' '
,
//TODO: this is not the most clever regex - need to compare it to the w3c spec for box-shadow
// box-shadow: left bottom size (spread - Moz) color
'/(?<=[^a-z0-9-])box-shadows*:(s*)(([^s;}]+)(s+[^s;}]+)(s+[^s;}]+)(s+[^;}]+)|(none))s*(?=;|})/siU'
=> '-webkit-box-shadow: 34567;'
. ' -moz-box-shadow: 34567;'
. ' -khtml-box-shadow: 34567;'
. ' '
,
// text-shadow - to fix the Chrome rendering bug, see http://jsbin.com/acalu4
self::getTextShadowRegex()
=> 'text-shadow: 0 0 0 transparent, 1'
,
// box-sizing
'/(?<=[^a-z0-9-])box-sizings*:s*([^s;}]+)s*(?=;|})/siU'
=> '-webkit-box-sizing: 1;'
. ' -moz-box-sizing: 1;'
. ' -ms-box-sizing: 1;'
. ' '
,
// transform
'/(?<=[^a-z0-9-])transforms*:s*([^;}]+)(?=;|})/siU'
=> '-webkit-transform: 1;'
. ' -moz-transform: 1;'
. ' -o-transform: 1;'
. ' -ms-transform: 1;'
. ' '
,
// rgba borders
'/(?<=[^a-z0-9-])border([a-z-]*)s*:([^;}]*)rgba(s*(d+s*,s*d+s*,s*d+)s*,s*([d.]+)s*)([^;}]*)(?=;|})/siU'
=> 'border1: 2rgb(3)5; border1: 2rgba(3, 4)5; _border1: 2rgb(3)5'
,
// columns
'/(?<=[^a-z0-9-])column([a-zA-Z0-9-]+)s*:s*([^s;}]+)s*(?=;|})/siU'
=> '-webkit-column1 : 2;'
. ' -moz-column1 : 2;'
. ' '
,
);
$output = preg_replace(
array_keys($cssTranslate),
$cssTranslate,
$output
);
//rgba translation - only for IE
$output = preg_replace_callback('/
(?<=[^a-z0-9-])
(backgrounds*:s*)
([^;}]*
(
rgba(
(s*d+%?s*,s*d+%?s*,s*d+%?s*,s*[0-9.]+s*)
)
)
[^;}]*)
s*
(?=;|})
/siUx', array('self', '_handleRgbaReplacement'), $output
);
return $output;
}
/**
* Returns a regular expression that matches SINGLE SHADOW text-shadow rules.
* Used to fix a Chrome rendering 'feature'.
*
* @link http://code.google.com/p/chromium/issues/detail?id=23440
*
* @return string
*/
public static function getTextShadowRegex()
{
$dimension = '(-?d+[a-z%]*)';
$namedColor = '([a-z0-9]+)';
$hexColor = '(#[a-f0-9]{3,6})';
$rgbColor = '(rgbs*(s*(d+%?)s*,s*(d+%?)s*,s*(d+%?)s*))';
$rgbaColor = '(rgbas*(s*(d+%?)s*,s*(d+%?)s*,s*(d+%?)s*,s*(d(.d+)?)s*))';
return "/(?<=[^a-z0-9-])text-shadows*:s*("
. "{$dimension}s+{$dimension}s+{$dimension}s+"
. "({$namedColor}|{$hexColor}|{$rgbColor}|{$rgbaColor})"
. ")s*(?=;|})/siU";
}
/**
* Handles replacement of an rgba() color with a link to the rgba.php image file
* that will generate a 10x10 PNG to show the image.
*
* @param array $match Match from regex
*
* @return string
*/
protected static function _handleRgbaReplacement(array $match)
{
$components = preg_split('#s*,s*#', trim($match[4]));
$value = $match[2];
if (strpos($value, 'linear-gradient(') !== false)
{
// can't rewrite within a linear gradient
return $match[0];
}
else if (strpos($value, 'url(') !== false)
{
// image and url, write rgb
$value = str_replace(
$match[3],
"rgb($components[0], $components[1], $components[2])",
$value
);
$filter = '';
}
else
{
$a = intval(255 * $components[3]);
unset($components[3]);
foreach ($components AS &$component)
{
if (substr($component, -1) == '%')
{
$component = intval(255 * intval($component) / 100);
}
}
$value = str_replace(
$match[3],
"url(rgba.php?r=$components[0]&g=$components[1]&b=$components[2]&a=$a)",
$value
);
$argb = sprintf('#%02X%02X%02X%02X', $a, $components[0], $components[1], $components[2]);
$filter = "; _filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=$argb,endColorstr=$argb)";
}
$newRule = $match[1] . $value . '; ';
return "$newRule$match[0]$filter";
}
/**
* Creates the CSS property access debug string from a list of invalid style
* propery accesses.
*
* @param array $invalidPropertyAccess Format: [group] => true ..OR.. [group][value] => true
*
* @return string
*/
public static function createDebugErrorString(array $invalidPropertyAccess)
{
if (!$invalidPropertyAccess)
{
return '';
}
$invalidPropertyErrors = array();
foreach ($invalidPropertyAccess AS $invalidGroup => $value)
{
if ($value === true)
{
$invalidPropertyErrors[] = "group: $invalidGroup";
}
else
{
foreach ($value AS $invalidProperty => $subValue)
{
$invalidPropertyErrors[] = "property: $invalidGroup.$invalidProperty";
}
}
}
if ($invalidPropertyErrors)
{
return "Invalid Property Access: " . implode(', ', $invalidPropertyErrors);
}
else
{
return '';
}
}
/**
* Gets debug output for errors as CSS rules that will change the display
* of the page to make it clear errors occurred.
*
* @param array $errors Collection of errors: [template name] => error text
*
* @return string
*/
public static function getDebugErrorsAsCss(array $errors)
{
if (!$errors)
{
return '';
}
$errorOutput = array();
foreach ($errors AS $errorFile => $errorText)
{
$errorOutput[] = "$errorFile: " . addslashes(str_replace(array("n", "r", "'", '"'), '', $errorText));
}
return "
/** Error output **/
body:before
{
background-color: #ccc;
color: black;
font-weight: bold;
display: block;
padding: 10px;
margin: 10px;
border: solid 1px #aaa;
border-radius: 5px;
content: 'CSS Error: " . implode('; ', $errorOutput) . "';
}
";
}
/**
* Outputs the specified CSS. Also outputs the necessary HTTP headers.
*
* @param string $css
*/
public function displayCss($css)
{
header('Content-type: text/css; charset=utf-8');
header('Expires: Wed, 01 Jan 2020 00:00:00 GMT');
header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $this->_styleModifiedDate) . ' GMT');
header('Cache-Control: public');
$extraHeaders = XenForo_Application::gzipContentIfSupported($css);
foreach ($extraHeaders AS $extraHeader)
{
header("$extraHeader[0]: $extraHeader[1]", $extraHeader[2]);
}
if (is_string($css) && $css && !ob_get_level() && XenForo_Application::get('config')->enableContentLength)
{
header('Content-Length: ' . strlen($css));
}
echo $css;
}
/**
* Static helper to execute a full request for CSS output. This will
* instantiate the object, pull the data from $_REQUEST, and then output
* the CSS.
*/
public static function run()
{
$dependencies = new XenForo_Dependencies_Public();
$dependencies->preLoadData();
$class = XenForo_Application::resolveDynamicClass(__CLASS__);
$cssOutput = new $class($_REQUEST);
if ($cssOutput->handleIfModifiedSinceHeader($_SERVER))
{
$cssOutput->displayCss($cssOutput->renderCss());
}
}
}