includes/media/SVG.php

   1 <?php
   2 /**
   3  * Handler for SVG images.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Media
  22  */
  23
  24 /**
  25  * Handler for SVG images.
  26  *
  27  * @ingroup Media
  28  */
  29 class SvgHandler extends ImageHandler {
  30         const SVG_METADATA_VERSION = 2;
  31
  32         /**
  33          * A list of metadata tags that can be converted
  34          * to the commonly used exif tags. This allows messages
  35          * to be reused, and consistent tag names for {{#formatmetadata:..}}
  36          */
  37         private static $metaConversion = array(
  38                 'originalwidth' => 'ImageWidth',
  39                 'originalheight' => 'ImageLength',
  40                 'description' => 'ImageDescription',
  41                 'title' => 'ObjectName',
  42         );
  43
  44         function isEnabled() {
  45                 global $wgSVGConverters, $wgSVGConverter;
  46                 if ( !isset( $wgSVGConverters[$wgSVGConverter] ) ) {
  47                         wfDebug( "\$wgSVGConverter is invalid, disabling SVG rendering.\n" );
  48
  49                         return false;
  50                 } else {
  51                         return true;
  52                 }
  53         }
  54
  55         function mustRender( $file ) {
  56                 return true;
  57         }
  58
  59         function isVectorized( $file ) {
  60                 return true;
  61         }
  62
  63         /**
  64          * @param $file File
  65          * @return bool
  66          */
  67         function isAnimatedImage( $file ) {
  68                 # TODO: detect animated SVGs
  69                 $metadata = $file->getMetadata();
  70                 if ( $metadata ) {
  71                         $metadata = $this->unpackMetadata( $metadata );
  72                         if ( isset( $metadata['animated'] ) ) {
  73                                 return $metadata['animated'];
  74                         }
  75                 }
  76
  77                 return false;
  78         }
  79
  80         /**
  81          * We do not support making animated svg thumbnails
  82          */
  83         function canAnimateThumb( $file ) {
  84                 return false;
  85         }
  86
  87         /**
  88          * @param $image File
  89          * @param  $params
  90          * @return bool
  91          */
  92         function normaliseParams( $image, &$params ) {
  93                 global $wgSVGMaxSize;
  94                 if ( !parent::normaliseParams( $image, $params ) ) {
  95                         return false;
  96                 }
  97                 # Don't make an image bigger than wgMaxSVGSize on the smaller side
  98                 if ( $params['physicalWidth'] <= $params['physicalHeight'] ) {
  99                         if ( $params['physicalWidth'] > $wgSVGMaxSize ) {
 100                                 $srcWidth = $image->getWidth( $params['page'] );
 101                                 $srcHeight = $image->getHeight( $params['page'] );
 102                                 $params['physicalWidth'] = $wgSVGMaxSize;
 103                                 $params['physicalHeight'] = File::scaleHeight( $srcWidth, $srcHeight, $wgSVGMaxSize );
 104                         }
 105                 } else {
 106                         if ( $params['physicalHeight'] > $wgSVGMaxSize ) {
 107                                 $srcWidth = $image->getWidth( $params['page'] );
 108                                 $srcHeight = $image->getHeight( $params['page'] );
 109                                 $params['physicalWidth'] = File::scaleHeight( $srcHeight, $srcWidth, $wgSVGMaxSize );
 110                                 $params['physicalHeight'] = $wgSVGMaxSize;
 111                         }
 112                 }
 113
 114                 return true;
 115         }
 116
 117         /**
 118          * @param $image File
 119          * @param  $dstPath
 120          * @param  $dstUrl
 121          * @param  $params
 122          * @param int $flags
 123          * @return bool|MediaTransformError|ThumbnailImage|TransformParameterError
 124          */
 125         function doTransform( $image, $dstPath, $dstUrl, $params, $flags = 0 ) {
 126                 if ( !$this->normaliseParams( $image, $params ) ) {
 127                         return new TransformParameterError( $params );
 128                 }
 129                 $clientWidth = $params['width'];
 130                 $clientHeight = $params['height'];
 131                 $physicalWidth = $params['physicalWidth'];
 132                 $physicalHeight = $params['physicalHeight'];
 133                 $lang = isset( $params['lang'] ) ? $params['lang'] : 'en';
 134
 135                 if ( $flags & self::TRANSFORM_LATER ) {
 136                         return new ThumbnailImage( $image, $dstUrl, $dstPath, $params );
 137                 }
 138
 139                 $metadata = $this->unpackMetadata( $image->getMetadata() );
 140                 if ( isset( $metadata['error'] ) ) { // sanity check
 141                         $err = wfMessage( 'svg-long-error', $metadata['error']['message'] )->text();
 142
 143                         return new MediaTransformError( 'thumbnail_error', $clientWidth, $clientHeight, $err );
 144                 }
 145
 146                 if ( !wfMkdirParents( dirname( $dstPath ), null, __METHOD__ ) ) {
 147                         return new MediaTransformError( 'thumbnail_error', $clientWidth, $clientHeight,
 148                                 wfMessage( 'thumbnail_dest_directory' )->text() );
 149                 }
 150
 151                 $srcPath = $image->getLocalRefPath();
 152                 $status = $this->rasterize( $srcPath, $dstPath, $physicalWidth, $physicalHeight, $lang );
 153                 if ( $status === true ) {
 154                         return new ThumbnailImage( $image, $dstUrl, $dstPath, $params );
 155                 } else {
 156                         return $status; // MediaTransformError
 157                 }
 158         }
 159
 160         /**
 161          * Transform an SVG file to PNG
 162          * This function can be called outside of thumbnail contexts
 163          * @param string $srcPath
 164          * @param string $dstPath
 165          * @param string $width
 166          * @param string $height
 167          * @param string $lang Language code of the language to render the SVG in
 168          * @throws MWException
 169          * @return bool|MediaTransformError
 170          */
 171         public function rasterize( $srcPath, $dstPath, $width, $height, $lang = false ) {
 172                 global $wgSVGConverters, $wgSVGConverter, $wgSVGConverterPath;
 173                 $err = false;
 174                 $retval = '';
 175                 if ( isset( $wgSVGConverters[$wgSVGConverter] ) ) {
 176                         if ( is_array( $wgSVGConverters[$wgSVGConverter] ) ) {
 177                                 // This is a PHP callable
 178                                 $func = $wgSVGConverters[$wgSVGConverter][0];
 179                                 $args = array_merge( array( $srcPath, $dstPath, $width, $height, $lang ),
 180                                         array_slice( $wgSVGConverters[$wgSVGConverter], 1 ) );
 181                                 if ( !is_callable( $func ) ) {
 182                                         throw new MWException( "$func is not callable" );
 183                                 }
 184                                 $err = call_user_func_array( $func, $args );
 185                                 $retval = (bool)$err;
 186                         } else {
 187                                 // External command
 188                                 $cmd = str_replace(
 189                                         array( '$path/', '$width', '$height', '$input', '$output' ),
 190                                         array( $wgSVGConverterPath ? wfEscapeShellArg( "$wgSVGConverterPath/" ) : "",
 191                                                 intval( $width ),
 192                                                 intval( $height ),
 193                                                 wfEscapeShellArg( $srcPath ),
 194                                                 wfEscapeShellArg( $dstPath ) ),
 195                                         $wgSVGConverters[$wgSVGConverter]
 196                                 );
 197
 198                                 $env = array();
 199                                 if ( $lang !== false ) {
 200                                         $env['LANG'] = $lang;
 201                                 }
 202
 203                                 wfProfileIn( 'rsvg' );
 204                                 wfDebug( __METHOD__ . ": $cmd\n" );
 205                                 $err = wfShellExecWithStderr( $cmd, $retval, $env );
 206                                 wfProfileOut( 'rsvg' );
 207                         }
 208                 }
 209                 $removed = $this->removeBadFile( $dstPath, $retval );
 210                 if ( $retval != 0 || $removed ) {
 211                         $this->logErrorForExternalProcess( $retval, $err, $cmd );
 212                         return new MediaTransformError( 'thumbnail_error', $width, $height, $err );
 213                 }
 214
 215                 return true;
 216         }
 217
 218         public static function rasterizeImagickExt( $srcPath, $dstPath, $width, $height ) {
 219                 $im = new Imagick( $srcPath );
 220                 $im->setImageFormat( 'png' );
 221                 $im->setBackgroundColor( 'transparent' );
 222                 $im->setImageDepth( 8 );
 223
 224                 if ( !$im->thumbnailImage( intval( $width ), intval( $height ), /* fit */ false ) ) {
 225                         return 'Could not resize image';
 226                 }
 227                 if ( !$im->writeImage( $dstPath ) ) {
 228                         return "Could not write to $dstPath";
 229                 }
 230         }
 231
 232         /**
 233          * @param $file File
 234          * @param  $path
 235          * @param bool $metadata
 236          * @return array
 237          */
 238         function getImageSize( $file, $path, $metadata = false ) {
 239                 if ( $metadata === false ) {
 240                         $metadata = $file->getMetaData();
 241                 }
 242                 $metadata = $this->unpackMetaData( $metadata );
 243
 244                 if ( isset( $metadata['width'] ) && isset( $metadata['height'] ) ) {
 245                         return array( $metadata['width'], $metadata['height'], 'SVG',
 246                                 "width=\"{$metadata['width']}\" height=\"{$metadata['height']}\"" );
 247                 } else { // error
 248                         return array( 0, 0, 'SVG', "width=\"0\" height=\"0\"" );
 249                 }
 250         }
 251
 252         function getThumbType( $ext, $mime, $params = null ) {
 253                 return array( 'png', 'image/png' );
 254         }
 255
 256         /**
 257          * Subtitle for the image. Different from the base
 258          * class so it can be denoted that SVG's have
 259          * a "nominal" resolution, and not a fixed one,
 260          * as well as so animation can be denoted.
 261          *
 262          * @param $file File
 263          * @return string
 264          */
 265         function getLongDesc( $file ) {
 266                 global $wgLang;
 267
 268                 $metadata = $this->unpackMetadata( $file->getMetadata() );
 269                 if ( isset( $metadata['error'] ) ) {
 270                         return wfMessage( 'svg-long-error', $metadata['error']['message'] )->text();
 271                 }
 272
 273                 $size = $wgLang->formatSize( $file->getSize() );
 274
 275                 if ( $this->isAnimatedImage( $file ) ) {
 276                         $msg = wfMessage( 'svg-long-desc-animated' );
 277                 } else {
 278                         $msg = wfMessage( 'svg-long-desc' );
 279                 }
 280
 281                 $msg->numParams( $file->getWidth(), $file->getHeight() )->params( $size );
 282
 283                 return $msg->parse();
 284         }
 285
 286         function getMetadata( $file, $filename ) {
 287                 $metadata = array( 'version' => self::SVG_METADATA_VERSION );
 288                 try {
 289                         $metadata += SVGMetadataExtractor::getMetadata( $filename );
 290                 } catch ( MWException $e ) { // @todo SVG specific exceptions
 291                         // File not found, broken, etc.
 292                         $metadata['error'] = array(
 293                                 'message' => $e->getMessage(),
 294                                 'code' => $e->getCode()
 295                         );
 296                         wfDebug( __METHOD__ . ': ' . $e->getMessage() . "\n" );
 297                 }
 298
 299                 return serialize( $metadata );
 300         }
 301
 302         function unpackMetadata( $metadata ) {
 303                 wfSuppressWarnings();
 304                 $unser = unserialize( $metadata );
 305                 wfRestoreWarnings();
 306                 if ( isset( $unser['version'] ) && $unser['version'] == self::SVG_METADATA_VERSION ) {
 307                         return $unser;
 308                 } else {
 309                         return false;
 310                 }
 311         }
 312
 313         function getMetadataType( $image ) {
 314                 return 'parsed-svg';
 315         }
 316
 317         function isMetadataValid( $image, $metadata ) {
 318                 $meta = $this->unpackMetadata( $metadata );
 319                 if ( $meta === false ) {
 320                         return self::METADATA_BAD;
 321                 }
 322                 if ( !isset( $meta['originalWidth'] ) ) {
 323                         // Old but compatible
 324                         return self::METADATA_COMPATIBLE;
 325                 }
 326
 327                 return self::METADATA_GOOD;
 328         }
 329
 330         function visibleMetadataFields() {
 331                 $fields = array( 'objectname', 'imagedescription' );
 332
 333                 return $fields;
 334         }
 335
 336         /**
 337          * @param $file File
 338          * @return array|bool
 339          */
 340         function formatMetadata( $file ) {
 341                 $result = array(
 342                         'visible' => array(),
 343                         'collapsed' => array()
 344                 );
 345                 $metadata = $file->getMetadata();
 346                 if ( !$metadata ) {
 347                         return false;
 348                 }
 349                 $metadata = $this->unpackMetadata( $metadata );
 350                 if ( !$metadata || isset( $metadata['error'] ) ) {
 351                         return false;
 352                 }
 353
 354                 /* TODO: add a formatter
 355                 $format = new FormatSVG( $metadata );
 356                 $formatted = $format->getFormattedData();
 357                 */
 358
 359                 // Sort fields into visible and collapsed
 360                 $visibleFields = $this->visibleMetadataFields();
 361
 362                 $showMeta = false;
 363                 foreach ( $metadata as $name => $value ) {
 364                         $tag = strtolower( $name );
 365                         if ( isset( self::$metaConversion[$tag] ) ) {
 366                                 $tag = strtolower( self::$metaConversion[$tag] );
 367                         } else {
 368                                 // Do not output other metadata not in list
 369                                 continue;
 370                         }
 371                         $showMeta = true;
 372                         self::addMeta( $result,
 373                                 in_array( $tag, $visibleFields ) ? 'visible' : 'collapsed',
 374                                 'exif',
 375                                 $tag,
 376                                 $value
 377                         );
 378                 }
 379
 380                 return $showMeta ? $result : false;
 381         }
 382
 383         /**
 384          * @param string $name Parameter name
 385          * @param $string $value Parameter value
 386          * @return bool Validity
 387          */
 388         function validateParam( $name, $value ) {
 389                 if ( in_array( $name, array( 'width', 'height' ) ) ) {
 390                         // Reject negative heights, widths
 391                         return ( $value > 0 );
 392                 } elseif ( $name == 'lang' ) {
 393                         // Validate $code
 394                         if ( !Language::isValidBuiltinCode( $value ) ) {
 395                                 wfDebug( "Invalid user language code\n" );
 396
 397                                 return false;
 398                         }
 399
 400                         return true;
 401                 }
 402
 403                 // Only lang, width and height are acceptable keys
 404                 return false;
 405         }
 406
 407         /**
 408          * @param array $params name=>value pairs of parameters
 409          * @return string Filename to use
 410          */
 411         function makeParamString( $params ) {
 412                 $lang = '';
 413                 if ( isset( $params['lang'] ) && $params['lang'] !== 'en' ) {
 414                         $params['lang'] = mb_strtolower( $params['lang'] );
 415                         $lang = "lang{$params['lang']}-";
 416                 }
 417                 if ( !isset( $params['width'] ) ) {
 418                         return false;
 419                 }
 420
 421                 return "$lang{$params['width']}px";
 422         }
 423
 424         function parseParamString( $str ) {
 425                 $m = false;
 426                 if ( preg_match( '/^lang([a-z]+(?:-[a-z]+)*)-(\d+)px$/', $str, $m ) ) {
 427                         return array( 'width' => array_pop( $m ), 'lang' => $m[1] );
 428                 } elseif ( preg_match( '/^(\d+)px$/', $str, $m ) ) {
 429                         return array( 'width' => $m[1], 'lang' => 'en' );
 430                 } else {
 431                         return false;
 432                 }
 433         }
 434
 435         function getParamMap() {
 436                 return array( 'img_lang' => 'lang', 'img_width' => 'width' );
 437         }
 438
 439         /**
 440          * @param $params
 441          * @return array
 442          */
 443         function getScriptParams( $params ) {
 444                 return array(
 445                         'width' => $params['width'],
 446                         'lang' => $params['lang'],
 447                 );
 448         }
 449
 450         public function getCommonMetaArray( File $file ) {
 451                 $metadata = $file->getMetadata();
 452                 if ( !$metadata ) {
 453                         return array();
 454                 }
 455                 $metadata = $this->unpackMetadata( $metadata );
 456                 if ( !$metadata || isset( $metadata['error'] ) ) {
 457                         return array();
 458                 }
 459                 $stdMetadata = array();
 460                 foreach ( $metadata as $name => $value ) {
 461                         $tag = strtolower( $name );
 462                         if ( $tag === 'originalwidth' || $tag === 'originalheight' ) {
 463                                 // Skip these. In the exif metadata stuff, it is assumed these
 464                                 // are measured in px, which is not the case here.
 465                                 continue;
 466                         }
 467                         if ( isset( self::$metaConversion[$tag] ) ) {
 468                                 $tag = self::$metaConversion[$tag];
 469                                 $stdMetadata[$tag] = $value;
 470                         }
 471                 }
 472
 473                 return $stdMetadata;
 474         }
 475 }