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<?php
/**
* Class encapsulating an image used in a ResourceLoaderImageModule.
*
* 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
*/
/**
* Class encapsulating an image used in a ResourceLoaderImageModule.
*
* @since 1.25
*/
class ResourceLoaderImage {
/**
* Map of allowed file extensions to their MIME types.
* @var array
*/
protected static $fileTypes = [
'svg' => 'image/svg+xml',
'png' => 'image/png',
'gif' => 'image/gif',
'jpg' => 'image/jpg',
];
/**
* @param string $name Image name
* @param string $module Module name
* @param string|array $descriptor Path to image file, or array structure containing paths
* @param string $basePath Directory to which paths in descriptor refer
* @param array $variants
* @throws InvalidArgumentException
*/
public function __construct( $name, $module, $descriptor, $basePath, $variants ) {
$this->name = $name;
$this->module = $module;
$this->descriptor = $descriptor;
$this->basePath = $basePath;
$this->variants = $variants;
// Expand shorthands:
// array( "en,de,fr" => "foo.svg" )
// → array( "en" => "foo.svg", "de" => "foo.svg", "fr" => "foo.svg" )
if ( is_array( $this->descriptor ) && isset( $this->descriptor['lang'] ) ) {
foreach ( array_keys( $this->descriptor['lang'] ) as $langList ) {
if ( strpos( $langList, ',' ) !== false ) {
$this->descriptor['lang'] += array_fill_keys(
explode( ',', $langList ),
$this->descriptor['lang'][$langList]
);
unset( $this->descriptor['lang'][$langList] );
}
}
}
// Ensure that all files have common extension.
$extensions = [];
$descriptor = (array)$descriptor;
array_walk_recursive( $descriptor, function ( $path ) use ( &$extensions ) {
$extensions[] = pathinfo( $path, PATHINFO_EXTENSION );
} );
$extensions = array_unique( $extensions );
if ( count( $extensions ) !== 1 ) {
throw new InvalidArgumentException(
"File type for different image files of '$name' not the same"
);
}
$ext = $extensions[0];
if ( !isset( self::$fileTypes[$ext] ) ) {
throw new InvalidArgumentException(
"Invalid file type for image files of '$name' (valid: svg, png, gif, jpg)"
);
}
$this->extension = $ext;
}
/**
* Get name of this image.
*
* @return string
*/
public function getName() {
return $this->name;
}
/**
* Get name of the module this image belongs to.
*
* @return string
*/
public function getModule() {
return $this->module;
}
/**
* Get the list of variants this image can be converted to.
*
* @return string[]
*/
public function getVariants() {
return array_keys( $this->variants );
}
/**
* Get the path to image file for given context.
*
* @param ResourceLoaderContext $context Any context
* @return string
*/
public function getPath( ResourceLoaderContext $context ) {
$desc = $this->descriptor;
if ( is_string( $desc ) ) {
return $this->basePath . '/' . $desc;
} elseif ( isset( $desc['lang'][$context->getLanguage()] ) ) {
return $this->basePath . '/' . $desc['lang'][$context->getLanguage()];
} elseif ( isset( $desc[$context->getDirection()] ) ) {
return $this->basePath . '/' . $desc[$context->getDirection()];
} else {
return $this->basePath . '/' . $desc['default'];
}
}
/**
* Get the extension of the image.
*
* @param string $format Format to get the extension for, 'original' or 'rasterized'
* @return string Extension without leading dot, e.g. 'png'
*/
public function getExtension( $format = 'original' ) {
if ( $format === 'rasterized' && $this->extension === 'svg' ) {
return 'png';
} else {
return $this->extension;
}
}
/**
* Get the MIME type of the image.
*
* @param string $format Format to get the MIME type for, 'original' or 'rasterized'
* @return string
*/
public function getMimeType( $format = 'original' ) {
$ext = $this->getExtension( $format );
return self::$fileTypes[$ext];
}
/**
* Get the load.php URL that will produce this image.
*
* @param ResourceLoaderContext $context Any context
* @param string $script URL to load.php
* @param string|null $variant Variant to get the URL for
* @param string $format Format to get the URL for, 'original' or 'rasterized'
* @return string
*/
public function getUrl( ResourceLoaderContext $context, $script, $variant, $format ) {
$query = [
'modules' => $this->getModule(),
'image' => $this->getName(),
'variant' => $variant,
'format' => $format,
'lang' => $context->getLanguage(),
'version' => $context->getVersion(),
];
return wfAppendQuery( $script, $query );
}
/**
* Get the data: URI that will produce this image.
*
* @param ResourceLoaderContext $context Any context
* @param string|null $variant Variant to get the URI for
* @param string $format Format to get the URI for, 'original' or 'rasterized'
* @return string
*/
public function getDataUri( ResourceLoaderContext $context, $variant, $format ) {
$type = $this->getMimeType( $format );
$contents = $this->getImageData( $context, $variant, $format );
return CSSMin::encodeStringAsDataURI( $contents, $type );
}
/**
* Get actual image data for this image. This can be saved to a file or sent to the browser to
* produce the converted image.
*
* Call getExtension() or getMimeType() with the same $format argument to learn what file type the
* returned data uses.
*
* @param ResourceLoaderContext $context Image context, or any context if $variant and $format
* given.
* @param string|null $variant Variant to get the data for. Optional; if given, overrides the data
* from $context.
* @param string $format Format to get the data for, 'original' or 'rasterized'. Optional; if
* given, overrides the data from $context.
* @return string|false Possibly binary image data, or false on failure
* @throws MWException If the image file doesn't exist
*/
public function getImageData( ResourceLoaderContext $context, $variant = false, $format = false ) {
if ( $variant === false ) {
$variant = $context->getVariant();
}
if ( $format === false ) {
$format = $context->getFormat();
}
$path = $this->getPath( $context );
if ( !file_exists( $path ) ) {
throw new MWException( "File '$path' does not exist" );
}
if ( $this->getExtension() !== 'svg' ) {
return file_get_contents( $path );
}
if ( $variant && isset( $this->variants[$variant] ) ) {
$data = $this->variantize( $this->variants[$variant], $context );
} else {
$data = file_get_contents( $path );
}
if ( $format === 'rasterized' ) {
$data = $this->rasterize( $data );
if ( !$data ) {
wfDebugLog( 'ResourceLoaderImage', __METHOD__ . " failed to rasterize for $path" );
}
}
return $data;
}
/**
* Send response headers (using the header() function) that are necessary to correctly serve the
* image data for this image, as returned by getImageData().
*
* Note that the headers are independent of the language or image variant.
*
* @param ResourceLoaderContext $context Image context
*/
public function sendResponseHeaders( ResourceLoaderContext $context ) {
$format = $context->getFormat();
$mime = $this->getMimeType( $format );
$filename = $this->getName() . '.' . $this->getExtension( $format );
header( 'Content-Type: ' . $mime );
header( 'Content-Disposition: ' .
FileBackend::makeContentDisposition( 'inline', $filename ) );
}
/**
* Convert this image, which is assumed to be SVG, to given variant.
*
* @param array $variantConf Array with a 'color' key, its value will be used as fill color
* @param ResourceLoaderContext $context Image context
* @return string New SVG file data
*/
protected function variantize( $variantConf, ResourceLoaderContext $context ) {
$dom = new DomDocument;
$dom->loadXML( file_get_contents( $this->getPath( $context ) ) );
$root = $dom->documentElement;
$wrapper = $dom->createElement( 'g' );
while ( $root->firstChild ) {
$wrapper->appendChild( $root->firstChild );
}
$root->appendChild( $wrapper );
$wrapper->setAttribute( 'fill', $variantConf['color'] );
return $dom->saveXML();
}
/**
* Massage the SVG image data for converters which don't understand some path data syntax.
*
* This is necessary for rsvg and ImageMagick when compiled with rsvg support.
* Upstream bug is https://bugzilla.gnome.org/show_bug.cgi?id=620923, fixed 2014-11-10, so
* this will be needed for a while. (T76852)
*
* @param string $svg SVG image data
* @return string Massaged SVG image data
*/
protected function massageSvgPathdata( $svg ) {
$dom = new DomDocument;
$dom->loadXML( $svg );
foreach ( $dom->getElementsByTagName( 'path' ) as $node ) {
$pathData = $node->getAttribute( 'd' );
// Make sure there is at least one space between numbers, and that leading zero is not omitted.
// rsvg has issues with syntax like "M-1-2" and "M.445.483" and especially "M-.445-.483".
$pathData = preg_replace( '/(-?)(\d*\.\d+|\d+)/', ' ${1}0$2 ', $pathData );
// Strip unnecessary leading zeroes for prettiness, not strictly necessary
$pathData = preg_replace( '/([ -])0(\d)/', '$1$2', $pathData );
$node->setAttribute( 'd', $pathData );
}
return $dom->saveXML();
}
/**
* Convert passed image data, which is assumed to be SVG, to PNG.
*
* @param string $svg SVG image data
* @return string|bool PNG image data, or false on failure
*/
protected function rasterize( $svg ) {
/**
* This code should be factored out to a separate method on SvgHandler, or perhaps a separate
* class, with a separate set of configuration settings.
*
* This is a distinct use case from regular SVG rasterization:
* * We can skip many sanity and security checks (as the images come from a trusted source,
* rather than from the user).
* * We need to provide extra options to some converters to achieve acceptable quality for very
* small images, which might cause performance issues in the general case.
* * We want to directly pass image data to the converter, rather than a file path.
*
* See https://phabricator.wikimedia.org/T76473#801446 for examples of what happens with the
* default settings.
*
* For now, we special-case rsvg (used in WMF production) and do a messy workaround for other
* converters.
*/
global $wgSVGConverter, $wgSVGConverterPath;
$svg = $this->massageSvgPathdata( $svg );
// Sometimes this might be 'rsvg-secure'. Long as it's rsvg.
if ( strpos( $wgSVGConverter, 'rsvg' ) === 0 ) {
$command = 'rsvg-convert';
if ( $wgSVGConverterPath ) {
$command = wfEscapeShellArg( "$wgSVGConverterPath/" ) . $command;
}
$process = proc_open(
$command,
[ 0 => [ 'pipe', 'r' ], 1 => [ 'pipe', 'w' ] ],
$pipes
);
if ( is_resource( $process ) ) {
fwrite( $pipes[0], $svg );
fclose( $pipes[0] );
$png = stream_get_contents( $pipes[1] );
fclose( $pipes[1] );
proc_close( $process );
return $png ?: false;
}
return false;
} else {
// Write input to and read output from a temporary file
$tempFilenameSvg = tempnam( wfTempDir(), 'ResourceLoaderImage' );
$tempFilenamePng = tempnam( wfTempDir(), 'ResourceLoaderImage' );
file_put_contents( $tempFilenameSvg, $svg );
$metadata = SVGMetadataExtractor::getMetadata( $tempFilenameSvg );
if ( !isset( $metadata['width'] ) || !isset( $metadata['height'] ) ) {
unlink( $tempFilenameSvg );
return false;
}
$handler = new SvgHandler;
$res = $handler->rasterize(
$tempFilenameSvg,
$tempFilenamePng,
$metadata['width'],
$metadata['height']
);
unlink( $tempFilenameSvg );
$png = null;
if ( $res === true ) {
$png = file_get_contents( $tempFilenamePng );
unlink( $tempFilenamePng );
}
return $png ?: false;
}
}
}