summaryrefslogtreecommitdiff
path: root/includes/media/SVG.php
blob: 8fdfa474083e0963ce51c28d058c4529d98c3db5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
<?php
/**
 * Handler for SVG images.
 *
 * 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
 * @ingroup Media
 */

/**
 * Handler for SVG images.
 *
 * @ingroup Media
 */
class SvgHandler extends ImageHandler {
	const SVG_METADATA_VERSION = 2;

	/** @var array A list of metadata tags that can be converted
	 *  to the commonly used exif tags. This allows messages
	 *  to be reused, and consistent tag names for {{#formatmetadata:..}}
	 */
	private static $metaConversion = array(
		'originalwidth' => 'ImageWidth',
		'originalheight' => 'ImageLength',
		'description' => 'ImageDescription',
		'title' => 'ObjectName',
	);

	function isEnabled() {
		global $wgSVGConverters, $wgSVGConverter;
		if ( !isset( $wgSVGConverters[$wgSVGConverter] ) ) {
			wfDebug( "\$wgSVGConverter is invalid, disabling SVG rendering.\n" );

			return false;
		} else {
			return true;
		}
	}

	function mustRender( $file ) {
		return true;
	}

	function isVectorized( $file ) {
		return true;
	}

	/**
	 * @param File $file
	 * @return bool
	 */
	function isAnimatedImage( $file ) {
		# @todo Detect animated SVGs
		$metadata = $file->getMetadata();
		if ( $metadata ) {
			$metadata = $this->unpackMetadata( $metadata );
			if ( isset( $metadata['animated'] ) ) {
				return $metadata['animated'];
			}
		}

		return false;
	}

	/**
	 * Which languages (systemLanguage attribute) is supported.
	 *
	 * @note This list is not guaranteed to be exhaustive.
	 * To avoid OOM errors, we only look at first bit of a file.
	 * Thus all languages on this list are present in the file,
	 * but its possible for the file to have a language not on
	 * this list.
	 *
	 * @param File $file
	 * @return array Array of language codes, or empty if no language switching supported.
	 */
	public function getAvailableLanguages( File $file ) {
		$metadata = $file->getMetadata();
		$langList = array();
		if ( $metadata ) {
			$metadata = $this->unpackMetadata( $metadata );
			if ( isset( $metadata['translations'] ) ) {
				foreach ( $metadata['translations'] as $lang => $langType ) {
					if ( $langType === SvgReader::LANG_FULL_MATCH ) {
						$langList[] = $lang;
					}
				}
			}
		}
		return $langList;
	}

	/**
	 * What language to render file in if none selected.
	 *
	 * @param File $file
	 * @return string Language code.
	 */
	public function getDefaultRenderLanguage( File $file ) {
		return 'en';
	}

	/**
	 * We do not support making animated svg thumbnails
	 * @param File $file
	 * @return bool
	 */
	function canAnimateThumbnail( $file ) {
		return false;
	}

	/**
	 * @param File $image
	 * @param array $params
	 * @return bool
	 */
	function normaliseParams( $image, &$params ) {
		global $wgSVGMaxSize;
		if ( !parent::normaliseParams( $image, $params ) ) {
			return false;
		}
		# Don't make an image bigger than wgMaxSVGSize on the smaller side
		if ( $params['physicalWidth'] <= $params['physicalHeight'] ) {
			if ( $params['physicalWidth'] > $wgSVGMaxSize ) {
				$srcWidth = $image->getWidth( $params['page'] );
				$srcHeight = $image->getHeight( $params['page'] );
				$params['physicalWidth'] = $wgSVGMaxSize;
				$params['physicalHeight'] = File::scaleHeight( $srcWidth, $srcHeight, $wgSVGMaxSize );
			}
		} else {
			if ( $params['physicalHeight'] > $wgSVGMaxSize ) {
				$srcWidth = $image->getWidth( $params['page'] );
				$srcHeight = $image->getHeight( $params['page'] );
				$params['physicalWidth'] = File::scaleHeight( $srcHeight, $srcWidth, $wgSVGMaxSize );
				$params['physicalHeight'] = $wgSVGMaxSize;
			}
		}

		return true;
	}

	/**
	 * @param File $image
	 * @param string $dstPath
	 * @param string $dstUrl
	 * @param array $params
	 * @param int $flags
	 * @return bool|MediaTransformError|ThumbnailImage|TransformParameterError
	 */
	function doTransform( $image, $dstPath, $dstUrl, $params, $flags = 0 ) {
		if ( !$this->normaliseParams( $image, $params ) ) {
			return new TransformParameterError( $params );
		}
		$clientWidth = $params['width'];
		$clientHeight = $params['height'];
		$physicalWidth = $params['physicalWidth'];
		$physicalHeight = $params['physicalHeight'];
		$lang = isset( $params['lang'] ) ? $params['lang'] : $this->getDefaultRenderLanguage( $image );

		if ( $flags & self::TRANSFORM_LATER ) {
			return new ThumbnailImage( $image, $dstUrl, $dstPath, $params );
		}

		$metadata = $this->unpackMetadata( $image->getMetadata() );
		if ( isset( $metadata['error'] ) ) { // sanity check
			$err = wfMessage( 'svg-long-error', $metadata['error']['message'] )->text();

			return new MediaTransformError( 'thumbnail_error', $clientWidth, $clientHeight, $err );
		}

		if ( !wfMkdirParents( dirname( $dstPath ), null, __METHOD__ ) ) {
			return new MediaTransformError( 'thumbnail_error', $clientWidth, $clientHeight,
				wfMessage( 'thumbnail_dest_directory' )->text() );
		}

		$srcPath = $image->getLocalRefPath();
		if ( $srcPath === false ) { // Failed to get local copy
			wfDebugLog( 'thumbnail',
				sprintf( 'Thumbnail failed on %s: could not get local copy of "%s"',
					wfHostname(), $image->getName() ) );

			return new MediaTransformError( 'thumbnail_error',
				$params['width'], $params['height'],
				wfMessage( 'filemissing' )->text()
			);
		}

		// Make a temp dir with a symlink to the local copy in it.
		// This plays well with rsvg-convert policy for external entities.
		// https://git.gnome.org/browse/librsvg/commit/?id=f01aded72c38f0e18bc7ff67dee800e380251c8e
		$tmpDir = wfTempDir() . '/svg_' . wfRandomString( 24 );
		$lnPath = "$tmpDir/" . basename( $srcPath );
		$ok = mkdir( $tmpDir, 0771 ) && symlink( $srcPath, $lnPath );
		$cleaner = new ScopedCallback( function () use ( $tmpDir, $lnPath ) {
			wfSuppressWarnings();
			unlink( $lnPath );
			rmdir( $tmpDir );
			wfRestoreWarnings();
		} );
		if ( !$ok ) {
			wfDebugLog( 'thumbnail',
				sprintf( 'Thumbnail failed on %s: could not link %s to %s',
					wfHostname(), $lnPath, $srcPath ) );
			return new MediaTransformError( 'thumbnail_error',
				$params['width'], $params['height'],
				wfMessage( 'thumbnail-temp-create' )->text()
			);
		}

		$status = $this->rasterize( $lnPath, $dstPath, $physicalWidth, $physicalHeight, $lang );
		if ( $status === true ) {
			return new ThumbnailImage( $image, $dstUrl, $dstPath, $params );
		} else {
			return $status; // MediaTransformError
		}
	}

	/**
	 * Transform an SVG file to PNG
	 * This function can be called outside of thumbnail contexts
	 * @param string $srcPath
	 * @param string $dstPath
	 * @param string $width
	 * @param string $height
	 * @param bool|string $lang Language code of the language to render the SVG in
	 * @throws MWException
	 * @return bool|MediaTransformError
	 */
	public function rasterize( $srcPath, $dstPath, $width, $height, $lang = false ) {
		global $wgSVGConverters, $wgSVGConverter, $wgSVGConverterPath;
		$err = false;
		$retval = '';
		if ( isset( $wgSVGConverters[$wgSVGConverter] ) ) {
			if ( is_array( $wgSVGConverters[$wgSVGConverter] ) ) {
				// This is a PHP callable
				$func = $wgSVGConverters[$wgSVGConverter][0];
				$args = array_merge( array( $srcPath, $dstPath, $width, $height, $lang ),
					array_slice( $wgSVGConverters[$wgSVGConverter], 1 ) );
				if ( !is_callable( $func ) ) {
					throw new MWException( "$func is not callable" );
				}
				$err = call_user_func_array( $func, $args );
				$retval = (bool)$err;
			} else {
				// External command
				$cmd = str_replace(
					array( '$path/', '$width', '$height', '$input', '$output' ),
					array( $wgSVGConverterPath ? wfEscapeShellArg( "$wgSVGConverterPath/" ) : "",
						intval( $width ),
						intval( $height ),
						wfEscapeShellArg( $srcPath ),
						wfEscapeShellArg( $dstPath ) ),
					$wgSVGConverters[$wgSVGConverter]
				);

				$env = array();
				if ( $lang !== false ) {
					$env['LANG'] = $lang;
				}

				wfDebug( __METHOD__ . ": $cmd\n" );
				$err = wfShellExecWithStderr( $cmd, $retval, $env );
			}
		}
		$removed = $this->removeBadFile( $dstPath, $retval );
		if ( $retval != 0 || $removed ) {
			$this->logErrorForExternalProcess( $retval, $err, $cmd );
			return new MediaTransformError( 'thumbnail_error', $width, $height, $err );
		}

		return true;
	}

	public static function rasterizeImagickExt( $srcPath, $dstPath, $width, $height ) {
		$im = new Imagick( $srcPath );
		$im->setImageFormat( 'png' );
		$im->setBackgroundColor( 'transparent' );
		$im->setImageDepth( 8 );

		if ( !$im->thumbnailImage( intval( $width ), intval( $height ), /* fit */ false ) ) {
			return 'Could not resize image';
		}
		if ( !$im->writeImage( $dstPath ) ) {
			return "Could not write to $dstPath";
		}
	}

	/**
	 * @param File $file
	 * @param string $path Unused
	 * @param bool|array $metadata
	 * @return array
	 */
	function getImageSize( $file, $path, $metadata = false ) {
		if ( $metadata === false ) {
			$metadata = $file->getMetaData();
		}
		$metadata = $this->unpackMetaData( $metadata );

		if ( isset( $metadata['width'] ) && isset( $metadata['height'] ) ) {
			return array( $metadata['width'], $metadata['height'], 'SVG',
				"width=\"{$metadata['width']}\" height=\"{$metadata['height']}\"" );
		} else { // error
			return array( 0, 0, 'SVG', "width=\"0\" height=\"0\"" );
		}
	}

	function getThumbType( $ext, $mime, $params = null ) {
		return array( 'png', 'image/png' );
	}

	/**
	 * Subtitle for the image. Different from the base
	 * class so it can be denoted that SVG's have
	 * a "nominal" resolution, and not a fixed one,
	 * as well as so animation can be denoted.
	 *
	 * @param File $file
	 * @return string
	 */
	function getLongDesc( $file ) {
		global $wgLang;

		$metadata = $this->unpackMetadata( $file->getMetadata() );
		if ( isset( $metadata['error'] ) ) {
			return wfMessage( 'svg-long-error', $metadata['error']['message'] )->text();
		}

		$size = $wgLang->formatSize( $file->getSize() );

		if ( $this->isAnimatedImage( $file ) ) {
			$msg = wfMessage( 'svg-long-desc-animated' );
		} else {
			$msg = wfMessage( 'svg-long-desc' );
		}

		$msg->numParams( $file->getWidth(), $file->getHeight() )->params( $size );

		return $msg->parse();
	}

	/**
	 * @param File $file
	 * @param string $filename
	 * @return string Serialised metadata
	 */
	function getMetadata( $file, $filename ) {
		$metadata = array( 'version' => self::SVG_METADATA_VERSION );
		try {
			$metadata += SVGMetadataExtractor::getMetadata( $filename );
		} catch ( Exception $e ) { // @todo SVG specific exceptions
			// File not found, broken, etc.
			$metadata['error'] = array(
				'message' => $e->getMessage(),
				'code' => $e->getCode()
			);
			wfDebug( __METHOD__ . ': ' . $e->getMessage() . "\n" );
		}

		return serialize( $metadata );
	}

	function unpackMetadata( $metadata ) {
		wfSuppressWarnings();
		$unser = unserialize( $metadata );
		wfRestoreWarnings();
		if ( isset( $unser['version'] ) && $unser['version'] == self::SVG_METADATA_VERSION ) {
			return $unser;
		} else {
			return false;
		}
	}

	function getMetadataType( $image ) {
		return 'parsed-svg';
	}

	function isMetadataValid( $image, $metadata ) {
		$meta = $this->unpackMetadata( $metadata );
		if ( $meta === false ) {
			return self::METADATA_BAD;
		}
		if ( !isset( $meta['originalWidth'] ) ) {
			// Old but compatible
			return self::METADATA_COMPATIBLE;
		}

		return self::METADATA_GOOD;
	}

	protected function visibleMetadataFields() {
		$fields = array( 'objectname', 'imagedescription' );

		return $fields;
	}

	/**
	 * @param File $file
	 * @param bool|IContextSource $context Context to use (optional)
	 * @return array|bool
	 */
	function formatMetadata( $file, $context = false ) {
		$result = array(
			'visible' => array(),
			'collapsed' => array()
		);
		$metadata = $file->getMetadata();
		if ( !$metadata ) {
			return false;
		}
		$metadata = $this->unpackMetadata( $metadata );
		if ( !$metadata || isset( $metadata['error'] ) ) {
			return false;
		}

		/* @todo Add a formatter
		$format = new FormatSVG( $metadata );
		$formatted = $format->getFormattedData();
		*/

		// Sort fields into visible and collapsed
		$visibleFields = $this->visibleMetadataFields();

		$showMeta = false;
		foreach ( $metadata as $name => $value ) {
			$tag = strtolower( $name );
			if ( isset( self::$metaConversion[$tag] ) ) {
				$tag = strtolower( self::$metaConversion[$tag] );
			} else {
				// Do not output other metadata not in list
				continue;
			}
			$showMeta = true;
			self::addMeta( $result,
				in_array( $tag, $visibleFields ) ? 'visible' : 'collapsed',
				'exif',
				$tag,
				$value
			);
		}

		return $showMeta ? $result : false;
	}

	/**
	 * @param string $name Parameter name
	 * @param mixed $value Parameter value
	 * @return bool Validity
	 */
	function validateParam( $name, $value ) {
		if ( in_array( $name, array( 'width', 'height' ) ) ) {
			// Reject negative heights, widths
			return ( $value > 0 );
		} elseif ( $name == 'lang' ) {
			// Validate $code
			if ( $value === '' || !Language::isValidBuiltinCode( $value ) ) {
				wfDebug( "Invalid user language code\n" );

				return false;
			}

			return true;
		}

		// Only lang, width and height are acceptable keys
		return false;
	}

	/**
	 * @param array $params Name=>value pairs of parameters
	 * @return string Filename to use
	 */
	function makeParamString( $params ) {
		$lang = '';
		if ( isset( $params['lang'] ) && $params['lang'] !== 'en' ) {
			$params['lang'] = strtolower( $params['lang'] );
			$lang = "lang{$params['lang']}-";
		}
		if ( !isset( $params['width'] ) ) {
			return false;
		}

		return "$lang{$params['width']}px";
	}

	function parseParamString( $str ) {
		$m = false;
		if ( preg_match( '/^lang([a-z]+(?:-[a-z]+)*)-(\d+)px$/', $str, $m ) ) {
			return array( 'width' => array_pop( $m ), 'lang' => $m[1] );
		} elseif ( preg_match( '/^(\d+)px$/', $str, $m ) ) {
			return array( 'width' => $m[1], 'lang' => 'en' );
		} else {
			return false;
		}
	}

	function getParamMap() {
		return array( 'img_lang' => 'lang', 'img_width' => 'width' );
	}

	/**
	 * @param array $params
	 * @return array
	 */
	function getScriptParams( $params ) {
		$scriptParams = array( 'width' => $params['width'] );
		if ( isset( $params['lang'] ) ) {
			$scriptParams['lang'] = $params['lang'];
		}

		return $scriptParams;
	}

	public function getCommonMetaArray( File $file ) {
		$metadata = $file->getMetadata();
		if ( !$metadata ) {
			return array();
		}
		$metadata = $this->unpackMetadata( $metadata );
		if ( !$metadata || isset( $metadata['error'] ) ) {
			return array();
		}
		$stdMetadata = array();
		foreach ( $metadata as $name => $value ) {
			$tag = strtolower( $name );
			if ( $tag === 'originalwidth' || $tag === 'originalheight' ) {
				// Skip these. In the exif metadata stuff, it is assumed these
				// are measured in px, which is not the case here.
				continue;
			}
			if ( isset( self::$metaConversion[$tag] ) ) {
				$tag = self::$metaConversion[$tag];
				$stdMetadata[$tag] = $value;
			}
		}

		return $stdMetadata;
	}
}