Merge pull request #4157 from WoltLab/attachment-lazy

[GitHub/WoltLab/WCF.git] / wcfsetup / install / files / lib / data / style / Style.class.php

<?php

namespace wcf\data\style;

use wcf\data\DatabaseObject;
use wcf\system\application\ApplicationHandler;
use wcf\system\WCF;
use wcf\util\FileUtil;
use wcf\util\ImageUtil;

/**
 * Represents a style.
 *
 * @author  Marcel Werk
 * @copyright   2001-2019 WoltLab GmbH
 * @license GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
 * @package WoltLabSuite\Core\Data\Style
 *
 * @property-read   int $styleID        unique id of the style
 * @property-read   int $packageID      id of the package which delivers the style
 * @property-read   string $styleName      name of style
 * @property-read   int $templateGroupID    id of the template group used for the style or `0` if the style uses no specific template group
 * @property-read   int $isDefault      is `1` if the style is the default style for guests and users, otherwise `0`
 * @property-read   int $isDisabled     is `1` if the style is disabled and thus cannot be used without having the specific permission to do so, otherwise `0`
 * @property-read   string $styleDescription   description of the style or name of the language item which contains the description
 * @property-read   string $styleVersion       version number of the style
 * @property-read   string $styleDate      date when the used version of the style has been published
 * @property-read   string $image          link or path (relative to `WCF_DIR`) to the preview image of the style
 * @property-read   string $image2x        link or path (relative to `WCF_DIR`) to the preview image of the style (2x version)
 * @property-read   string $copyright      copyright text of the style
 * @property-read   string $license        name of the style's license
 * @property-read   string $authorName     name(s) of the style's author(s)
 * @property-read   string $authorURL      link to the author's website
 * @property-read   string $imagePath      path (relative to `WCF_DIR`) to the images used by the style or empty if style has no special image path
 * @property-read   string $packageName        package identifier used to export the style as a package or empty (thus style cannot be exported as package)
 * @property-read   int $isTainted      is `0` if the original declarations of an imported or installed style are not and cannot be altered, otherwise `1`
 * @property-read   int $hasFavicon     is `0` if the default favicon data should be used
 * @property-read   int $coverPhotoExtension    extension of the style's cover photo file
 * @property-read       string $apiVersion             the style's compatibility version, possible values: '3.0' or '3.1'
 */
class Style extends DatabaseObject
{
    /**
     * list of style variables
     * @var string[]
     */
    protected $variables = [];

    /**
     * list of supported API versions
     * @var string[]
     */
    public static $supportedApiVersions = ['3.0', '3.1', '5.2'];

    const API_VERSION = '5.2';

    const PREVIEW_IMAGE_MAX_HEIGHT = 64;

    const PREVIEW_IMAGE_MAX_WIDTH = 102;

    const FAVICON_IMAGE_HEIGHT = 256;

    const FAVICON_IMAGE_WIDTH = 256;

    const BASE_ASSET_PATH = WCF_DIR . 'images/';

    /**
     * Returns the name of this style.
     *
     * @return  string
     */
    public function __toString()
    {
        return $this->styleName;
    }

    /**
     * Returns the absolute path to the style's asset folder.
     *
     * @return  string
     * @since   5.3
     */
    public function getAssetPath()
    {
        return FileUtil::addTrailingSlash(static::BASE_ASSET_PATH . 'style-' . $this->styleID);
    }

    /**
     * Returns the styles variables of this style.
     *
     * @return  string[]
     */
    public function getVariables()
    {
        $this->loadVariables();

        return $this->variables;
    }

    /**
     * Returns a specific style variable or null if not found.
     * If $toHex is set to true the color defined by the variable
     * will be converted to the hexadecimal notation (e.g. for use
     * in emails)
     *
     * @param string $variableName
     * @param bool $toHex
     * @return  string
     */
    public function getVariable($variableName, $toHex = false)
    {
        if (isset($this->variables[$variableName])) {
            // check if variable is empty
            if ($this->variables[$variableName] == '~""') {
                return '';
            }

            if (
                $toHex && \preg_match(
                    '/^rgba\((\d+), (\d+), (\d+), (1|0?\.\d+)\)$/',
                    $this->variables[$variableName],
                    $matches
                )
            ) {
                $r = $matches[1];
                $g = $matches[2];
                $b = $matches[3];
                $a = \floatval($matches[4]);

                // calculate alpha value assuming a white canvas, source rgb will be (255,255,255) or #fff
                // see https://stackoverflow.com/a/2049362
                if ($a < 1) {
                    $r = ((1 - $a) * 255) + ($a * $r);
                    $g = ((1 - $a) * 255) + ($a * $g);
                    $b = ((1 - $a) * 255) + ($a * $b);

                    $clamp = static function ($v) {
                        return \max(0, \min(255, \intval($v)));
                    };

                    $r = $clamp($r);
                    $g = $clamp($g);
                    $b = $clamp($b);
                }

                return \sprintf('#%02x%02x%02x', $r, $g, $b);
            }

            return $this->variables[$variableName];
        }
    }

    /**
     * Loads style-specific variables.
     */
    public function loadVariables()
    {
        if (!empty($this->variables)) {
            return;
        }

        $sql = "SELECT      variable.variableName, variable.defaultValue, value.variableValue
                FROM        wcf" . WCF_N . "_style_variable variable
                LEFT JOIN   wcf" . WCF_N . "_style_variable_value value
                ON          value.variableID = variable.variableID
                        AND value.styleID = ?
                ORDER BY    variable.variableID ASC";
        $statement = WCF::getDB()->prepareStatement($sql);
        $statement->execute([$this->styleID]);
        while ($row = $statement->fetchArray()) {
            $variableName = $row['variableName'];
            $variableValue = $row['variableValue'] ?? $row['defaultValue'];

            $this->variables[$variableName] = $variableValue;
        }

        // see https://github.com/WoltLab/WCF/issues/2636
        if (empty($this->variables['wcfPageThemeColor'])) {
            $this->variables['wcfPageThemeColor'] = $this->variables['wcfHeaderBackground'];
        }
    }

    /**
     * Returns the style preview image path.
     *
     * @return  string
     */
    public function getPreviewImage()
    {
        if ($this->image && \file_exists(WCF_DIR . 'images/' . $this->image)) {
            return WCF::getPath() . 'images/' . $this->image;
        }

        return WCF::getPath() . 'images/stylePreview.png';
    }

    /**
     * Returns the style preview image path (2x version).
     *
     * @return  string
     */
    public function getPreviewImage2x()
    {
        if ($this->image2x && \file_exists(WCF_DIR . 'images/' . $this->image2x)) {
            return WCF::getPath() . 'images/' . $this->image2x;
        }

        return WCF::getPath() . 'images/stylePreview@2x.png';
    }

    /**
     * Returns the absolute path to the apple touch icon.
     *
     * @return  string
     */
    public function getFaviconAppleTouchIcon()
    {
        return $this->getFaviconPath('apple-touch-icon.png');
    }

    /**
     * Returns the absolute path to the `manifest.json` file.
     *
     * @return  string
     */
    public function getFaviconManifest()
    {
        return $this->getFaviconPath('manifest.json');
    }

    /**
     * Returns the absolute path to the `browserconfig.xml` file.
     *
     * @return  string
     */
    public function getFaviconBrowserconfig()
    {
        return $this->getFaviconPath('browserconfig.xml');
    }

    /**
     * Returns the relative path to the favicon.
     *
     * @return  string
     */
    public function getRelativeFavicon()
    {
        return $this->getFaviconPath('favicon.ico', false);
    }

    /**
     * Returns the cover photo filename.
     * @since 3.1
     */
    public function getCoverPhoto(?bool $forceWebP = null): string
    {
        $useWebP = $this->useWebP($forceWebP);

        if ($this->coverPhotoExtension) {
            return 'coverPhoto.' . ($useWebP ? 'webp' : $this->coverPhotoExtension);
        }

        return 'default.' . ($useWebP ? 'webp' : 'jpg');
    }

    /**
     * @since 5.2
     */
    public function getCoverPhotoLocation(?bool $forceWebP = null): string
    {
        $useWebP = $this->useWebP($forceWebP);

        if ($this->coverPhotoExtension) {
            return $this->getAssetPath() . 'coverPhoto.' . ($useWebP ? 'webp' : $this->coverPhotoExtension);
        }

        return WCF_DIR . 'images/coverPhotos/default.' . ($useWebP ? 'webp' : 'jpg');
    }

    /**
     * @since 5.2
     */
    public function getCoverPhotoUrl(?bool $forceWebP = null): string
    {
        $useWebP = $this->useWebP($forceWebP);

        if ($this->coverPhotoExtension) {
            return WCF::getPath() . FileUtil::getRelativePath(
                WCF_DIR,
                $this->getAssetPath()
            ) . 'coverPhoto.' . ($useWebP ? 'webp' : $this->coverPhotoExtension);
        }

        return WCF::getPath() . 'images/coverPhotos/' . $this->getCoverPhoto();
    }

    /**
     * Serve the WebP variant of the cover photo if the browser supports
     * it and the original cover photo is not a GIF.
     *
     * @since 5.4
     */
    protected function useWebP($forceWebP = null): bool
    {
        if ($this->coverPhotoExtension === "gif") {
            return false;
        }

        return $forceWebP || ($forceWebP === null && ImageUtil::browserSupportsWebP());
    }

    /**
     * Returns the path to a favicon-related file.
     *
     * @param string $filename name of the file
     * @param bool $absolutePath if `true`, the absolute path is returned, otherwise the path relative to WCF is returned
     * @return  string
     */
    protected function getFaviconPath($filename, $absolutePath = true)
    {
        if ($filename === 'manifest.json') {
            if (ApplicationHandler::getInstance()->getActiveApplication()->domainName !== ApplicationHandler::getInstance()->getApplicationByID(1)->domainName) {
                return WCF::getPath() . 'images/favicon/corsProxy.php?type=manifest' . ($this->hasFavicon ? '&amp;styleID=' . $this->styleID : '');
            }
        }

        if ($this->hasFavicon) {
            $path = FileUtil::getRelativePath(WCF_DIR, $this->getAssetPath()) . $filename;
        } else {
            $path = 'images/favicon/default.' . $filename;
        }

        if ($absolutePath) {
            return WCF::getPath() . $path;
        }

        return $path;
    }

    /**
     * Splits the less variables string.
     *
     * @param string $variables
     * @return  array
     * @since   3.0
     */
    public static function splitLessVariables($variables)
    {
        $tmp = \explode("/* WCF_STYLE_CUSTOM_USER_MODIFICATIONS */\n", $variables, 2);

        return [
            'preset' => $tmp[0],
            'custom' => $tmp[1] ?? '',
        ];
    }

    /**
     * Joins the less variables.
     *
     * @param string $preset
     * @param string $custom
     * @return  string
     * @since   3.0
     */
    public static function joinLessVariables($preset, $custom)
    {
        if (empty($custom)) {
            return $preset;
        }

        return $preset . "/* WCF_STYLE_CUSTOM_USER_MODIFICATIONS */\n" . $custom;
    }
}