MediaWiki  1.27.1
RandomImageGenerator.php
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1 <?php
31  private $dictionaryFile;
32  private $minWidth = 400;
33  private $maxWidth = 800;
34  private $minHeight = 400;
35  private $maxHeight = 800;
36  private $shapesToDraw = 5;
37 
45  private static $orientations = [
46  [
47  '0thRow' => 'top',
48  '0thCol' => 'left',
49  'exifCode' => 1,
50  'counterRotation' => [ [ 1, 0 ], [ 0, 1 ] ]
51  ],
52  [
53  '0thRow' => 'bottom',
54  '0thCol' => 'right',
55  'exifCode' => 3,
56  'counterRotation' => [ [ -1, 0 ], [ 0, -1 ] ]
57  ],
58  [
59  '0thRow' => 'right',
60  '0thCol' => 'top',
61  'exifCode' => 6,
62  'counterRotation' => [ [ 0, 1 ], [ 1, 0 ] ]
63  ],
64  [
65  '0thRow' => 'left',
66  '0thCol' => 'bottom',
67  'exifCode' => 8,
68  'counterRotation' => [ [ 0, -1 ], [ -1, 0 ] ]
69  ]
70  ];
71 
72  public function __construct( $options = [] ) {
73  foreach ( [ 'dictionaryFile', 'minWidth', 'minHeight',
74  'maxWidth', 'maxHeight', 'shapesToDraw' ] as $property
75  ) {
76  if ( isset( $options[$property] ) ) {
77  $this->$property = $options[$property];
78  }
79  }
80 
81  // find the dictionary file, to generate random names
82  if ( !isset( $this->dictionaryFile ) ) {
83  foreach (
84  [
85  '/usr/share/dict/words',
86  '/usr/dict/words',
87  __DIR__ . '/words.txt'
89  ) {
90  if ( is_file( $dictionaryFile ) and is_readable( $dictionaryFile ) ) {
91  $this->dictionaryFile = $dictionaryFile;
92  break;
93  }
94  }
95  }
96  if ( !isset( $this->dictionaryFile ) ) {
97  throw new Exception( "RandomImageGenerator: dictionary file not "
98  . "found or not specified properly" );
99  }
100  }
101 
111  function writeImages( $number, $format = 'jpg', $dir = null ) {
112  $filenames = $this->getRandomFilenames( $number, $format, $dir );
113  $imageWriteMethod = $this->getImageWriteMethod( $format );
114  foreach ( $filenames as $filename ) {
115  $this->{$imageWriteMethod}( $this->getImageSpec(), $format, $filename );
116  }
117 
118  return $filenames;
119  }
120 
129  function getImageWriteMethod( $format ) {
131  if ( $format === 'svg' ) {
132  return 'writeSvg';
133  } else {
134  // figure out how to write images
136  if ( class_exists( 'Imagick' ) && $wgExiv2Command && is_executable( $wgExiv2Command ) ) {
137  return 'writeImageWithApi';
138  } elseif ( $wgUseImageMagick
139  && $wgImageMagickConvertCommand
140  && is_executable( $wgImageMagickConvertCommand )
141  ) {
142  return 'writeImageWithCommandLine';
143  }
144  }
145  throw new Exception( "RandomImageGenerator: could not find a suitable "
146  . "method to write images in '$format' format" );
147  }
148 
158  private function getRandomFilenames( $number, $extension = 'jpg', $dir = null ) {
159  if ( is_null( $dir ) ) {
160  $dir = getcwd();
161  }
162  $filenames = [];
163  foreach ( $this->getRandomWordPairs( $number ) as $pair ) {
164  $basename = $pair[0] . '_' . $pair[1];
165  if ( !is_null( $extension ) ) {
166  $basename .= '.' . $extension;
167  }
168  $basename = preg_replace( '/\s+/', '', $basename );
169  $filenames[] = "$dir/$basename";
170  }
171 
172  return $filenames;
173  }
174 
183  public function getImageSpec() {
184  $spec = [];
185 
186  $spec['width'] = mt_rand( $this->minWidth, $this->maxWidth );
187  $spec['height'] = mt_rand( $this->minHeight, $this->maxHeight );
188  $spec['fill'] = $this->getRandomColor();
189 
190  $diagonalLength = sqrt( pow( $spec['width'], 2 ) + pow( $spec['height'], 2 ) );
191 
192  $draws = [];
193  for ( $i = 0; $i <= $this->shapesToDraw; $i++ ) {
194  $radius = mt_rand( 0, $diagonalLength / 4 );
195  if ( $radius == 0 ) {
196  continue;
197  }
198  $originX = mt_rand( -1 * $radius, $spec['width'] + $radius );
199  $originY = mt_rand( -1 * $radius, $spec['height'] + $radius );
200  $angle = mt_rand( 0, ( 3.141592 / 2 ) * $radius ) / $radius;
201  $legDeltaX = round( $radius * sin( $angle ) );
202  $legDeltaY = round( $radius * cos( $angle ) );
203 
204  $draw = [];
205  $draw['fill'] = $this->getRandomColor();
206  $draw['shape'] = [
207  [ 'x' => $originX, 'y' => $originY - $radius ],
208  [ 'x' => $originX + $legDeltaX, 'y' => $originY + $legDeltaY ],
209  [ 'x' => $originX - $legDeltaX, 'y' => $originY + $legDeltaY ],
210  [ 'x' => $originX, 'y' => $originY - $radius ]
211  ];
212  $draws[] = $draw;
213  }
214 
215  $spec['draws'] = $draws;
216 
217  return $spec;
218  }
219 
227  static function shapePointsToString( $shape ) {
228  $points = [];
229  foreach ( $shape as $point ) {
230  $points[] = $point['x'] . ',' . $point['y'];
231  }
232 
233  return implode( " ", $points );
234  }
235 
246  public function writeSvg( $spec, $format, $filename ) {
247  $svg = new SimpleXmlElement( '<svg/>' );
248  $svg->addAttribute( 'xmlns', 'http://www.w3.org/2000/svg' );
249  $svg->addAttribute( 'version', '1.1' );
250  $svg->addAttribute( 'width', $spec['width'] );
251  $svg->addAttribute( 'height', $spec['height'] );
252  $g = $svg->addChild( 'g' );
253  foreach ( $spec['draws'] as $drawSpec ) {
254  $shape = $g->addChild( 'polygon' );
255  $shape->addAttribute( 'fill', $drawSpec['fill'] );
256  $shape->addAttribute( 'points', self::shapePointsToString( $drawSpec['shape'] ) );
257  }
258 
259  $fh = fopen( $filename, 'w' );
260  if ( !$fh ) {
261  throw new Exception( "couldn't open $filename for writing" );
262  }
263  fwrite( $fh, $svg->asXML() );
264  if ( !fclose( $fh ) ) {
265  throw new Exception( "couldn't close $filename" );
266  }
267  }
268 
275  public function writeImageWithApi( $spec, $format, $filename ) {
276  // this is a hack because I can't get setImageOrientation() to work. See below.
278 
279  $image = new Imagick();
286  $orientation = self::$orientations[0]; // default is normal orientation
287  if ( $format == 'jpg' ) {
288  $orientation = self::$orientations[array_rand( self::$orientations )];
289  $spec = self::rotateImageSpec( $spec, $orientation['counterRotation'] );
290  }
291 
292  $image->newImage( $spec['width'], $spec['height'], new ImagickPixel( $spec['fill'] ) );
293 
294  foreach ( $spec['draws'] as $drawSpec ) {
295  $draw = new ImagickDraw();
296  $draw->setFillColor( $drawSpec['fill'] );
297  $draw->polygon( $drawSpec['shape'] );
298  $image->drawImage( $draw );
299  }
300 
301  $image->setImageFormat( $format );
302 
303  // this doesn't work, even though it's documented to do so...
304  // $image->setImageOrientation( $orientation['exifCode'] );
305 
306  $image->writeImage( $filename );
307 
308  // because the above setImageOrientation call doesn't work... nor can I
309  // get an external imagemagick binary to do this either... Hacking this
310  // for now (only works if you have exiv2 installed, a program to read
311  // and manipulate exif).
312  if ( $wgExiv2Command ) {
313  $cmd = wfEscapeShellArg( $wgExiv2Command )
314  . " -M "
315  . wfEscapeShellArg( "set Exif.Image.Orientation " . $orientation['exifCode'] )
316  . " "
317  . wfEscapeShellArg( $filename );
318 
319  $retval = 0;
320  $err = wfShellExec( $cmd, $retval );
321  if ( $retval !== 0 ) {
322  print "Error with $cmd: $retval, $err\n";
323  }
324  }
325  }
326 
334  private static function rotateImageSpec( &$spec, $matrix ) {
335  $tSpec = [];
336  $dims = self::matrixMultiply2x2( $matrix, $spec['width'], $spec['height'] );
337  $correctionX = 0;
338  $correctionY = 0;
339  if ( $dims['x'] < 0 ) {
340  $correctionX = abs( $dims['x'] );
341  }
342  if ( $dims['y'] < 0 ) {
343  $correctionY = abs( $dims['y'] );
344  }
345  $tSpec['width'] = abs( $dims['x'] );
346  $tSpec['height'] = abs( $dims['y'] );
347  $tSpec['fill'] = $spec['fill'];
348  $tSpec['draws'] = [];
349  foreach ( $spec['draws'] as $draw ) {
350  $tDraw = [
351  'fill' => $draw['fill'],
352  'shape' => []
353  ];
354  foreach ( $draw['shape'] as $point ) {
355  $tPoint = self::matrixMultiply2x2( $matrix, $point['x'], $point['y'] );
356  $tPoint['x'] += $correctionX;
357  $tPoint['y'] += $correctionY;
358  $tDraw['shape'][] = $tPoint;
359  }
360  $tSpec['draws'][] = $tDraw;
361  }
362 
363  return $tSpec;
364  }
365 
373  private static function matrixMultiply2x2( $matrix, $x, $y ) {
374  return [
375  'x' => $x * $matrix[0][0] + $y * $matrix[0][1],
376  'y' => $x * $matrix[1][0] + $y * $matrix[1][1]
377  ];
378  }
379 
397  public function writeImageWithCommandLine( $spec, $format, $filename ) {
399  $args = [];
400  $args[] = "-size " . wfEscapeShellArg( $spec['width'] . 'x' . $spec['height'] );
401  $args[] = wfEscapeShellArg( "xc:" . $spec['fill'] );
402  foreach ( $spec['draws'] as $draw ) {
403  $fill = $draw['fill'];
404  $polygon = self::shapePointsToString( $draw['shape'] );
405  $drawCommand = "fill $fill polygon $polygon";
406  $args[] = '-draw ' . wfEscapeShellArg( $drawCommand );
407  }
408  $args[] = wfEscapeShellArg( $filename );
409 
410  $command = wfEscapeShellArg( $wgImageMagickConvertCommand ) . " " . implode( " ", $args );
411  $retval = null;
413 
414  return ( $retval === 0 );
415  }
416 
422  public function getRandomColor() {
423  $components = [];
424  for ( $i = 0; $i <= 2; $i++ ) {
425  $components[] = mt_rand( 0, 255 );
426  }
427 
428  return 'rgb(' . implode( ', ', $components ) . ')';
429  }
430 
438  private function getRandomWordPairs( $number ) {
439  $lines = $this->getRandomLines( $number * 2 );
440  // construct pairs of words
441  $pairs = [];
442  $count = count( $lines );
443  for ( $i = 0; $i < $count; $i += 2 ) {
444  $pairs[] = [ $lines[$i], $lines[$i + 1] ];
445  }
446 
447  return $pairs;
448  }
449 
460  private function getRandomLines( $number_desired ) {
461  $filepath = $this->dictionaryFile;
462 
463  // initialize array of lines
464  $lines = [];
465  for ( $i = 0; $i < $number_desired; $i++ ) {
466  $lines[] = null;
467  }
468 
469  /*
470  * This algorithm obtains N random lines from a file in one single pass.
471  * It does this by replacing elements of a fixed-size array of lines,
472  * less and less frequently as it reads the file.
473  */
474  $fh = fopen( $filepath, "r" );
475  if ( !$fh ) {
476  throw new Exception( "couldn't open $filepath" );
477  }
478  $line_number = 0;
479  $max_index = $number_desired - 1;
480  while ( !feof( $fh ) ) {
481  $line = fgets( $fh );
482  if ( $line !== false ) {
483  $line_number++;
484  $line = trim( $line );
485  if ( mt_rand( 0, $line_number ) <= $max_index ) {
486  $lines[mt_rand( 0, $max_index )] = $line;
487  }
488  }
489  }
490  fclose( $fh );
491  if ( $line_number < $number_desired ) {
492  throw new Exception( "not enough lines in $filepath" );
493  }
494 
495  return $lines;
496  }
497 }
writeImages($number, $format= 'jpg', $dir=null)
Writes random images with random filenames to disk in the directory you specify, or current working d...
getRandomLines($number_desired)
Return N random lines from a file.
$wgImageMagickConvertCommand
The convert command shipped with ImageMagick.
$property
if(count($args)==0) $dir
$command
Definition: cdb.php:65
wfShellExec($cmd, &$retval=null, $environ=[], $limits=[], $options=[])
Execute a shell command, with time and memory limits mirrored from the PHP configuration if supported...
when a variable name is used in a it is silently declared as a new local masking the global
Definition: design.txt:93
getImageWriteMethod($format)
Figure out how we write images.
if($line===false) $args
Definition: cdb.php:64
$wgExiv2Command
Some tests and extensions use exiv2 to manipulate the Exif metadata in some image formats...
$wgUseImageMagick
Resizing can be done using PHP's internal image libraries or using ImageMagick or another third-party...
$points
this hook is for auditing only RecentChangesLinked and Watchlist RecentChangesLinked and Watchlist e g Watchlist removed from all revisions and log entries to which it was applied This gives extensions a chance to take it off their books as the deletion has already been partly carried out by this point or something similar the user will be unable to create the tag set and then return false from the hook function Ensure you consume the ChangeTagAfterDelete hook to carry out custom deletion actions as context called by AbstractContent::getParserOutput May be used to override the normal model specific rendering of page content as context as context $options
Definition: hooks.txt:1004
writeSvg($spec, $format, $filename)
Based on image specification, write a very simple SVG file to disk.
getRandomWordPairs($number)
Get an array of random pairs of random words, like array( array( 'foo', 'bar' ), array( 'quux'...
and(b) You must cause any modified files to carry prominent notices stating that You changed the files
writeImageWithApi($spec, $format, $filename)
Based on an image specification, write such an image to disk, using Imagick PHP extension.
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Definition: distributors.txt:9
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
$lines
Definition: router.php:66
getImageSpec()
Generate data representing an image of random size (within limits), consisting of randomly colored an...
static shapePointsToString($shape)
Given array( array('x' => 10, 'y' => 20), array( 'x' => 30, y=> 5 ) ) returns "10,20 30,5" Useful for SVG and imagemagick command line arguments.
$line
Definition: cdb.php:59
static rotateImageSpec(&$spec, $matrix)
Given an image specification, produce rotated version This is used when simulating a rotated image ca...
RandomImageGenerator: does what it says on the tin.
static __construct($options=[])
this hook is for auditing only or null if authentication failed before getting that far or null if we can t even determine that probably a stub it is not rendered in wiki pages or galleries in category pages allow injecting custom HTML after the section Any uses of the hook need to handle escaping see BaseTemplate::getToolbox and BaseTemplate::makeListItem for details on the format of individual items inside of this array or by returning and letting standard HTTP rendering take place modifiable or by returning false and taking over the output modifiable modifiable after all normalizations have been except for the $wgMaxImageArea check $image
Definition: hooks.txt:762
$count
wfEscapeShellArg()
Windows-compatible version of escapeshellarg() Windows doesn't recognise single-quotes in the shell...
getRandomFilenames($number, $extension= 'jpg', $dir=null)
Return a number of randomly-generated filenames Each filename uses two words randomly drawn from the ...
static matrixMultiply2x2($matrix, $x, $y)
Given a matrix and a pair of images, return new position.
static $orientations
Orientations: 0th row, 0th column, Exif orientation code, rotation 2x2 matrix that is opposite of ori...
getRandomColor()
Generate a string of random colors for ImageMagick or SVG, like "rgb(12, 37, 98)".
please add to it if you re going to add events to the MediaWiki code where normally authentication against an external auth plugin would be creating a local account incomplete not yet checked for validity & $retval
Definition: hooks.txt:242
writeImageWithCommandLine($spec, $format, $filename)
Based on an image specification, write such an image to disk, using the command line ImageMagick prog...