MediaWiki  1.28.1
BitmapMetadataHandler.php
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1 <?php
25 
38  private $metadata = [];
39 
41  private $metaPriority = [
42  20 => [ 'other' ],
43  40 => [ 'native' ],
44  60 => [ 'iptc-good-hash', 'iptc-no-hash' ],
45  70 => [ 'xmp-deprecated' ],
46  80 => [ 'xmp-general' ],
47  90 => [ 'xmp-exif' ],
48  100 => [ 'iptc-bad-hash' ],
49  120 => [ 'exif' ],
50  ];
51 
53  private $iptcType = 'iptc-no-hash';
54 
63  private function doApp13( $app13 ) {
64  try {
65  $this->iptcType = JpegMetadataExtractor::doPSIR( $app13 );
66  } catch ( Exception $e ) {
67  // Error reading the iptc hash information.
68  // This probably means the App13 segment is something other than what we expect.
69  // However, still try to read it, and treat it as if the hash didn't exist.
70  wfDebug( "Error parsing iptc data of file: " . $e->getMessage() . "\n" );
71  $this->iptcType = 'iptc-no-hash';
72  }
73 
74  $iptc = IPTC::parse( $app13 );
75  $this->addMetadata( $iptc, $this->iptcType );
76  }
77 
88  function getExif( $filename, $byteOrder ) {
90  if ( file_exists( $filename ) && $wgShowEXIF ) {
91  $exif = new Exif( $filename, $byteOrder );
92  $data = $exif->getFilteredData();
93  if ( $data ) {
94  $this->addMetadata( $data, 'exif' );
95  }
96  }
97  }
98 
105  function addMetadata( $metaArray, $type = 'other' ) {
106  if ( isset( $this->metadata[$type] ) ) {
107  /* merge with old data */
108  $metaArray = $metaArray + $this->metadata[$type];
109  }
110 
111  $this->metadata[$type] = $metaArray;
112  }
113 
123  function getMetadataArray() {
124  // this seems a bit ugly... This is all so its merged in right order
125  // based on the MWG recomendation.
126  $temp = [];
127  krsort( $this->metaPriority );
128  foreach ( $this->metaPriority as $pri ) {
129  foreach ( $pri as $type ) {
130  if ( isset( $this->metadata[$type] ) ) {
131  // Do some special casing for multilingual values.
132  // Don't discard translations if also as a simple value.
133  foreach ( $this->metadata[$type] as $itemName => $item ) {
134  if ( is_array( $item ) && isset( $item['_type'] ) && $item['_type'] === 'lang' ) {
135  if ( isset( $temp[$itemName] ) && !is_array( $temp[$itemName] ) ) {
136  $default = $temp[$itemName];
137  $temp[$itemName] = $item;
138  $temp[$itemName]['x-default'] = $default;
139  unset( $this->metadata[$type][$itemName] );
140  }
141  }
142  }
143 
144  $temp = $temp + $this->metadata[$type];
145  }
146  }
147  }
148 
149  return $temp;
150  }
151 
158  static function Jpeg( $filename ) {
159  $showXMP = XMPReader::isSupported();
160  $meta = new self();
161 
162  $seg = JpegMetadataExtractor::segmentSplitter( $filename );
163  if ( isset( $seg['COM'] ) && isset( $seg['COM'][0] ) ) {
164  $meta->addMetadata( [ 'JPEGFileComment' => $seg['COM'] ], 'native' );
165  }
166  if ( isset( $seg['PSIR'] ) && count( $seg['PSIR'] ) > 0 ) {
167  foreach ( $seg['PSIR'] as $curPSIRValue ) {
168  $meta->doApp13( $curPSIRValue );
169  }
170  }
171  if ( isset( $seg['XMP'] ) && $showXMP ) {
172  $xmp = new XMPReader( LoggerFactory::getInstance( 'XMP' ) );
173  $xmp->parse( $seg['XMP'] );
174  foreach ( $seg['XMP_ext'] as $xmpExt ) {
175  /* Support for extended xmp in jpeg files
176  * is not well tested and a bit fragile.
177  */
178  $xmp->parseExtended( $xmpExt );
179  }
180  $res = $xmp->getResults();
181  foreach ( $res as $type => $array ) {
182  $meta->addMetadata( $array, $type );
183  }
184  }
185  if ( isset( $seg['byteOrder'] ) ) {
186  $meta->getExif( $filename, $seg['byteOrder'] );
187  }
188 
189  return $meta->getMetadataArray();
190  }
191 
200  public static function PNG( $filename ) {
201  $showXMP = XMPReader::isSupported();
202 
203  $meta = new self();
204  $array = PNGMetadataExtractor::getMetadata( $filename );
205  if ( isset( $array['text']['xmp']['x-default'] )
206  && $array['text']['xmp']['x-default'] !== '' && $showXMP
207  ) {
208  $xmp = new XMPReader( LoggerFactory::getInstance( 'XMP' ) );
209  $xmp->parse( $array['text']['xmp']['x-default'] );
210  $xmpRes = $xmp->getResults();
211  foreach ( $xmpRes as $type => $xmpSection ) {
212  $meta->addMetadata( $xmpSection, $type );
213  }
214  }
215  unset( $array['text']['xmp'] );
216  $meta->addMetadata( $array['text'], 'native' );
217  unset( $array['text'] );
218  $array['metadata'] = $meta->getMetadataArray();
219  $array['metadata']['_MW_PNG_VERSION'] = PNGMetadataExtractor::VERSION;
220 
221  return $array;
222  }
223 
232  public static function GIF( $filename ) {
233 
234  $meta = new self();
235  $baseArray = GIFMetadataExtractor::getMetadata( $filename );
236 
237  if ( count( $baseArray['comment'] ) > 0 ) {
238  $meta->addMetadata( [ 'GIFFileComment' => $baseArray['comment'] ], 'native' );
239  }
240 
241  if ( $baseArray['xmp'] !== '' && XMPReader::isSupported() ) {
242  $xmp = new XMPReader( LoggerFactory::getInstance( 'XMP' ) );
243  $xmp->parse( $baseArray['xmp'] );
244  $xmpRes = $xmp->getResults();
245  foreach ( $xmpRes as $type => $xmpSection ) {
246  $meta->addMetadata( $xmpSection, $type );
247  }
248  }
249 
250  unset( $baseArray['comment'] );
251  unset( $baseArray['xmp'] );
252 
253  $baseArray['metadata'] = $meta->getMetadataArray();
254  $baseArray['metadata']['_MW_GIF_VERSION'] = GIFMetadataExtractor::VERSION;
255 
256  return $baseArray;
257  }
258 
272  public static function Tiff( $filename ) {
273  if ( file_exists( $filename ) ) {
274  $byteOrder = self::getTiffByteOrder( $filename );
275  if ( !$byteOrder ) {
276  throw new MWException( "Error determining byte order of $filename" );
277  }
278  $exif = new Exif( $filename, $byteOrder );
279  $data = $exif->getFilteredData();
280  if ( $data ) {
281  $data['MEDIAWIKI_EXIF_VERSION'] = Exif::version();
282 
283  return $data;
284  } else {
285  throw new MWException( "Could not extract data from tiff file $filename" );
286  }
287  } else {
288  throw new MWException( "File doesn't exist - $filename" );
289  }
290  }
291 
299  static function getTiffByteOrder( $filename ) {
300  $fh = fopen( $filename, 'rb' );
301  if ( !$fh ) {
302  return false;
303  }
304  $head = fread( $fh, 2 );
305  fclose( $fh );
306 
307  switch ( $head ) {
308  case 'II':
309  return 'LE'; // II for intel.
310  case 'MM':
311  return 'BE'; // MM for motorla.
312  default:
313  return false; // Something went wrong.
314 
315  }
316  }
317 }
static PNG($filename)
Entry point for png At some point in the future this might merge the png various tEXt chunks to that ...
Apache License January AND DISTRIBUTION Definitions License shall mean the terms and conditions for use
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Definition: hooks.txt:2102
static version()
#@-
Definition: Exif.php:586
static getTiffByteOrder($filename)
Read the first 2 bytes of a tiff file to figure out Little Endian or Big Endian.
static Tiff($filename)
This doesn't do much yet, but eventually I plan to add XMP support for Tiff.
when a variable name is used in a it is silently declared as a new local masking the global
Definition: design.txt:93
wfDebug($text, $dest= 'all', array $context=[])
Sends a line to the debug log if enabled or, optionally, to a comment in output.
static GIF($filename)
function for gif images.
static isSupported()
Check if this instance supports using this class.
Definition: XMP.php:198
Class to deal with reconciling and extracting metadata from bitmap images.
$wgShowEXIF
Show Exif data, on by default if available.
static segmentSplitter($filename)
Function to extract metadata segments of interest from jpeg files based on GIFMetadataExtractor.
addMetadata($metaArray, $type= 'other')
Add misc metadata.
$res
Definition: database.txt:21
static getMetadata($filename)
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Definition: distributors.txt:9
static Jpeg($filename)
Main entry point for jpeg's.
Class for reading xmp data containing properties relevant to images, and spitting out an array that F...
Definition: XMP.php:54
doApp13($app13)
This does the photoshop image resource app13 block of interest, IPTC-IIM metadata is stored here...
static getMetadata($filename)
injection txt This is an overview of how MediaWiki makes use of dependency injection The design described here grew from the discussion of RFC T384 The term dependency this means that anything an object needs to operate should be injected from the the object itself should only know narrow no concrete implementation of the logic it relies on The requirement to inject everything typically results in an architecture that based on two main types of and essentially stateless service objects that use other service objects to operate on the value objects As of the beginning MediaWiki is only starting to use the DI approach Much of the code still relies on global state or direct resulting in a highly cyclical dependency which acts as the top level factory for services in MediaWiki which can be used to gain access to default instances of various services MediaWikiServices however also allows new services to be defined and default services to be redefined Services are defined or redefined by providing a callback the instantiator that will return a new instance of the service When it will create an instance of MediaWikiServices and populate it with the services defined in the files listed by thereby bootstrapping the DI framework Per $wgServiceWiringFiles lists includes ServiceWiring php
Definition: injection.txt:35
getMetadataArray()
Merge together the various types of metadata the different types have different priorites, and are merged in order.
getExif($filename, $byteOrder)
Get exif info using exif class.
static parse($rawData)
This takes the results of iptcparse() and puts it into a form that can be handled by mediawiki...
Definition: IPTC.php:40
Class to extract and validate Exif data from jpeg (and possibly tiff) files.
Definition: Exif.php:32
MediaWiki Logger LoggerFactory implements a PSR[0] compatible message logging system Named Psr Log LoggerInterface instances can be obtained from the MediaWiki Logger LoggerFactory::getInstance() static method.MediaWiki\Logger\LoggerFactory expects a class implementing the MediaWiki\Logger\Spi interface to act as a factory for new Psr\Log\LoggerInterface instances.The"Spi"in MediaWiki\Logger\Spi stands for"service provider interface".An SPI is an API intended to be implemented or extended by a third party.This software design pattern is intended to enable framework extension and replaceable components.It is specifically used in the MediaWiki\Logger\LoggerFactory service to allow alternate PSR-3 logging implementations to be easily integrated with MediaWiki.The service provider interface allows the backend logging library to be implemented in multiple ways.The $wgMWLoggerDefaultSpi global provides the classname of the default MediaWiki\Logger\Spi implementation to be loaded at runtime.This can either be the name of a class implementing the MediaWiki\Logger\Spi with a zero argument const ructor or a callable that will return an MediaWiki\Logger\Spi instance.Alternately the MediaWiki\Logger\LoggerFactory MediaWiki Logger LoggerFactory
Definition: logger.txt:5
array $metaPriority
Metadata priority.
static doPSIR($app13)
This reads the photoshop image resource.
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Definition: hooks.txt:2491