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<?php
/**
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @author Trevor Parscal
*/
namespace MediaWiki\ResourceLoader;
use DomainException;
use InvalidArgumentException;
use Wikimedia\Minify\CSSMin;
/**
* Module for generated and embedded images.
*
* @ingroup ResourceLoader
* @since 1.25
*/
class ImageModule extends Module {
/** @var bool */
private $useMaskImage;
/** @var array|null */
protected $definition;
/**
* Local base path, see __construct()
* @var string
*/
protected $localBasePath = '';
/** @inheritDoc */
protected $origin = self::ORIGIN_CORE_SITEWIDE;
/** @var Image[][]|null */
protected $imageObjects = null;
/** @var array */
protected $images = [];
/** @var string|null */
protected $defaultColor = null;
/** @var bool */
protected $useDataURI = true;
/** @var array|null */
protected $globalVariants = null;
/** @var array */
protected $variants = [];
/** @var string|null */
protected $prefix = null;
/** @var string */
protected $selectorWithoutVariant = '.{prefix}-{name}';
/** @var string */
protected $selectorWithVariant = '.{prefix}-{name}-{variant}';
/**
* Constructs a new module from an options array.
*
* @param array $options List of options; if not given or empty, an empty module will be
* constructed
* @param string|null $localBasePath Base path to prepend to all local paths in $options. Defaults
* to $IP
*
* Below is a description for the $options array:
* @par Construction options:
* @code
* [
* // When set the icon will use mask-image instead of background-image for the CSS output. Using mask-image
* // allows colorization of SVGs in Codex. Defaults to false for backwards compatibility.
* 'useMaskImage' => false,
* // Base path to prepend to all local paths in $options. Defaults to $IP
* 'localBasePath' => [base path],
* // Path to JSON file that contains any of the settings below
* 'data' => [file path string]
* // CSS class prefix to use in all style rules
* 'prefix' => [CSS class prefix],
* // Alternatively: Format of CSS selector to use in all style rules
* 'selector' => [CSS selector template, variables: {prefix} {name} {variant}],
* // Alternatively: When using variants
* 'selectorWithoutVariant' => [CSS selector template, variables: {prefix} {name}],
* 'selectorWithVariant' => [CSS selector template, variables: {prefix} {name} {variant}],
* // List of variants that may be used for the image files
* 'variants' => [
* // This level of nesting can be omitted if you use the same images for every skin
* [skin name (or 'default')] => [
* [variant name] => [
* 'color' => [color string, e.g. '#ffff00'],
* 'global' => [boolean, if true, this variant is available
* for all images of this type],
* ],
* ...
* ],
* ...
* ],
* // List of image files and their options
* 'images' => [
* // This level of nesting can be omitted if you use the same images for every skin
* [skin name (or 'default')] => [
* [icon name] => [
* 'file' => [file path string or array whose values are file path strings
* and whose keys are 'default', 'ltr', 'rtl', a single
* language code like 'en', or a list of language codes like
* 'en,de,ar'],
* 'variants' => [array of variant name strings, variants
* available for this image],
* ],
* ...
* ],
* ...
* ],
* ]
* @endcode
*/
public function __construct( array $options = [], $localBasePath = null ) {
$this->useMaskImage = $options['useMaskImage'] ?? false;
$this->localBasePath = static::extractLocalBasePath( $options, $localBasePath );
$this->definition = $options;
}
/**
* Parse definition and external JSON data, if referenced.
*/
protected function loadFromDefinition() {
if ( $this->definition === null ) {
return;
}
$options = $this->definition;
$this->definition = null;
if ( isset( $options['data'] ) ) {
$dataPath = $this->getLocalPath( $options['data'] );
$data = json_decode( file_get_contents( $dataPath ), true );
$options = array_merge( $data, $options );
}
// Accepted combinations:
// * prefix
// * selector
// * selectorWithoutVariant + selectorWithVariant
// * prefix + selector
// * prefix + selectorWithoutVariant + selectorWithVariant
$prefix = isset( $options['prefix'] ) && $options['prefix'];
$selector = isset( $options['selector'] ) && $options['selector'];
$selectorWithoutVariant = isset( $options['selectorWithoutVariant'] )
&& $options['selectorWithoutVariant'];
$selectorWithVariant = isset( $options['selectorWithVariant'] )
&& $options['selectorWithVariant'];
if ( $selectorWithoutVariant && !$selectorWithVariant ) {
throw new InvalidArgumentException(
"Given 'selectorWithoutVariant' but no 'selectorWithVariant'."
);
}
if ( $selectorWithVariant && !$selectorWithoutVariant ) {
throw new InvalidArgumentException(
"Given 'selectorWithVariant' but no 'selectorWithoutVariant'."
);
}
if ( $selector && $selectorWithVariant ) {
throw new InvalidArgumentException(
"Incompatible 'selector' and 'selectorWithVariant'+'selectorWithoutVariant' given."
);
}
if ( !$prefix && !$selector && !$selectorWithVariant ) {
throw new InvalidArgumentException(
"None of 'prefix', 'selector' or 'selectorWithVariant'+'selectorWithoutVariant' given."
);
}
foreach ( $options as $member => $option ) {
switch ( $member ) {
case 'images':
case 'variants':
if ( !is_array( $option ) ) {
throw new InvalidArgumentException(
"Invalid list error. '$option' given, array expected."
);
}
if ( !isset( $option['default'] ) ) {
// Backwards compatibility
$option = [ 'default' => $option ];
}
foreach ( $option as $data ) {
if ( !is_array( $data ) ) {
throw new InvalidArgumentException(
"Invalid list error. '$data' given, array expected."
);
}
}
$this->{$member} = $option;
break;
case 'useDataURI':
$this->{$member} = (bool)$option;
break;
case 'defaultColor':
case 'prefix':
case 'selectorWithoutVariant':
case 'selectorWithVariant':
$this->{$member} = (string)$option;
break;
case 'selector':
$this->selectorWithoutVariant = $this->selectorWithVariant = (string)$option;
}
}
}
/**
* Get CSS class prefix used by this module.
* @return string
*/
public function getPrefix() {
$this->loadFromDefinition();
return $this->prefix;
}
/**
* Get CSS selector templates used by this module.
* @return string[]
*/
public function getSelectors() {
$this->loadFromDefinition();
return [
'selectorWithoutVariant' => $this->selectorWithoutVariant,
'selectorWithVariant' => $this->selectorWithVariant,
];
}
/**
* Get an Image object for given image.
* @param string $name Image name
* @param Context $context
* @return Image|null
*/
public function getImage( $name, Context $context ): ?Image {
$this->loadFromDefinition();
$images = $this->getImages( $context );
return $images[$name] ?? null;
}
/**
* Get Image objects for all images.
* @param Context $context
* @return Image[] Array keyed by image name
*/
public function getImages( Context $context ): array {
$skin = $context->getSkin();
if ( $this->imageObjects === null ) {
$this->loadFromDefinition();
$this->imageObjects = [];
}
if ( !isset( $this->imageObjects[$skin] ) ) {
$this->imageObjects[$skin] = [];
if ( !isset( $this->images[$skin] ) ) {
$this->images[$skin] = $this->images['default'] ?? [];
}
foreach ( $this->images[$skin] as $name => $options ) {
$fileDescriptor = is_array( $options ) ? $options['file'] : $options;
$allowedVariants = array_merge(
( is_array( $options ) && isset( $options['variants'] ) ) ? $options['variants'] : [],
$this->getGlobalVariants( $context )
);
if ( isset( $this->variants[$skin] ) ) {
$variantConfig = array_intersect_key(
$this->variants[$skin],
array_fill_keys( $allowedVariants, true )
);
} else {
$variantConfig = [];
}
$image = new Image(
$name,
$this->getName(),
$fileDescriptor,
$this->localBasePath,
$variantConfig,
$this->defaultColor
);
$this->imageObjects[$skin][$image->getName()] = $image;
}
}
return $this->imageObjects[$skin];
}
/**
* Get list of variants in this module that are 'global', i.e., available
* for every image regardless of image options.
* @param Context $context
* @return string[]
*/
public function getGlobalVariants( Context $context ): array {
$skin = $context->getSkin();
if ( $this->globalVariants === null ) {
$this->loadFromDefinition();
$this->globalVariants = [];
}
if ( !isset( $this->globalVariants[$skin] ) ) {
$this->globalVariants[$skin] = [];
if ( !isset( $this->variants[$skin] ) ) {
$this->variants[$skin] = $this->variants['default'] ?? [];
}
foreach ( $this->variants[$skin] as $name => $config ) {
if ( $config['global'] ?? false ) {
$this->globalVariants[$skin][] = $name;
}
}
}
return $this->globalVariants[$skin];
}
public function getStyles( Context $context ): array {
$this->loadFromDefinition();
// Build CSS rules
$rules = [];
$sources = $oldSources = $context->getResourceLoader()->getSources();
$this->getHookRunner()->onResourceLoaderModifyEmbeddedSourceUrls( $sources );
if ( array_keys( $sources ) !== array_keys( $oldSources ) ) {
throw new DomainException( 'ResourceLoaderModifyEmbeddedSourceUrls hook must not add or remove sources' );
}
$script = $sources[ $this->getSource() ];
$selectors = $this->getSelectors();
foreach ( $this->getImages( $context ) as $name => $image ) {
$declarations = $this->getStyleDeclarations( $context, $image, $script );
$selector = strtr(
$selectors['selectorWithoutVariant'],
[
'{prefix}' => $this->getPrefix(),
'{name}' => $name,
'{variant}' => '',
]
);
$rules[] = "$selector {\n\t$declarations\n}";
foreach ( $image->getVariants() as $variant ) {
$declarations = $this->getStyleDeclarations( $context, $image, $script, $variant );
$selector = strtr(
$selectors['selectorWithVariant'],
[
'{prefix}' => $this->getPrefix(),
'{name}' => $name,
'{variant}' => $variant,
]
);
$rules[] = "$selector {\n\t$declarations\n}";
}
}
$style = implode( "\n", $rules );
return [ 'all' => $style ];
}
/**
* This method must not be used by getDefinitionSummary as doing so would cause
* an infinite loop (we use Image::getUrl below which calls
* Module:getVersionHash, which calls Module::getDefinitionSummary).
*
* @param Context $context
* @param Image $image Image to get the style for
* @param string $script URL to load.php
* @param string|null $variant Variant to get the style for
* @return string
*/
private function getStyleDeclarations(
Context $context,
Image $image,
$script,
$variant = null
) {
$imageDataUri = $this->useDataURI ? $image->getDataUri( $context, $variant, 'original' ) : false;
$primaryUrl = $imageDataUri ?: $image->getUrl( $context, $script, $variant, 'original' );
$declarations = $this->getCssDeclarations(
$primaryUrl
);
return implode( "\n\t", $declarations );
}
/**
* Format the CSS declaration for the image as a background-image property.
*
* @param string $primary Primary URI
* @return string[] CSS declarations
*/
protected function getCssDeclarations( $primary ): array {
$primaryUrl = CSSMin::buildUrlValue( $primary );
if ( $this->supportsMaskImage() ) {
return [
"-webkit-mask-image: $primaryUrl;",
"mask-image: $primaryUrl;",
];
}
return [
"background-image: $primaryUrl;",
];
}
/**
* @return bool
*/
public function supportsMaskImage() {
return $this->useMaskImage;
}
/**
* @return bool
*/
public function supportsURLLoading() {
return false;
}
/**
* Get the definition summary for this module.
*
* @param Context $context
* @return array
*/
public function getDefinitionSummary( Context $context ) {
$this->loadFromDefinition();
$summary = parent::getDefinitionSummary( $context );
$options = [];
foreach ( [
'localBasePath',
'images',
'variants',
'prefix',
'selectorWithoutVariant',
'selectorWithVariant',
] as $member ) {
$options[$member] = $this->{$member};
}
$summary[] = [
'options' => $options,
'fileHashes' => $this->getFileHashes( $context ),
];
return $summary;
}
/**
* Helper method for getDefinitionSummary.
* @param Context $context
* @return array
*/
private function getFileHashes( Context $context ) {
$this->loadFromDefinition();
$files = [];
foreach ( $this->getImages( $context ) as $image ) {
$files[] = $image->getPath( $context );
}
$files = array_values( array_unique( $files ) );
return array_map( [ __CLASS__, 'safeFileHash' ], $files );
}
/**
* @param string|FilePath $path
* @return string
*/
protected function getLocalPath( $path ) {
if ( $path instanceof FilePath ) {
return $path->getLocalPath();
}
return "{$this->localBasePath}/$path";
}
/**
* Extract a local base path from module definition information.
*
* @param array $options Module definition
* @param string|null $localBasePath Path to use if not provided in module definition. Defaults
* to $IP.
* @return string Local base path
*/
public static function extractLocalBasePath( array $options, $localBasePath = null ) {
global $IP;
if ( array_key_exists( 'localBasePath', $options ) ) {
$localBasePath = (string)$options['localBasePath'];
}
return $localBasePath ?? $IP;
}
/**
* @return string
*/
public function getType() {
return self::LOAD_STYLES;
}
}