includes/media/MediaTransformOutput.php

   1 <?php
   2 /**
   3  * Base class for the output of file transformation methods.
   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  * Base class for the output of MediaHandler::doTransform() and File::transform().
  26  *
  27  * @ingroup Media
  28  */
  29 abstract class MediaTransformOutput {
  30         /** @var array Associative array mapping optional supplementary image files
  31          *  from pixel density (eg 1.5 or 2) to additional URLs.
  32          */
  33         public $responsiveUrls = [];
  34
  35         /** @var File */
  36         protected $file;
  37
  38         /** @var int Image width */
  39         protected $width;
  40
  41         /** @var int Image height */
  42         protected $height;
  43
  44         /** @var string URL path to the thumb */
  45         protected $url;
  46
  47         /** @var bool|string */
  48         protected $page;
  49
  50         /** @var bool|string Filesystem path to the thumb */
  51         protected $path;
  52
  53         /** @var bool|string Language code, false if not set */
  54         protected $lang;
  55
  56         /** @var bool|string Permanent storage path */
  57         protected $storagePath = false;
  58
  59         /**
  60          * @return int Width of the output box
  61          */
  62         public function getWidth() {
  63                 return $this->width;
  64         }
  65
  66         /**
  67          * @return int Height of the output box
  68          */
  69         public function getHeight() {
  70                 return $this->height;
  71         }
  72
  73         /**
  74          * @return File
  75          */
  76         public function getFile() {
  77                 return $this->file;
  78         }
  79
  80         /**
  81          * Get the final extension of the thumbnail.
  82          * Returns false for scripted transformations.
  83          * @return string|bool
  84          */
  85         public function getExtension() {
  86                 return $this->path ? FileBackend::extensionFromPath( $this->path ) : false;
  87         }
  88
  89         /**
  90          * @return string|bool The thumbnail URL
  91          */
  92         public function getUrl() {
  93                 return $this->url;
  94         }
  95
  96         /**
  97          * @return string|bool The permanent thumbnail storage path
  98          */
  99         public function getStoragePath() {
 100                 return $this->storagePath;
 101         }
 102
 103         /**
 104          * @param string $storagePath The permanent storage path
 105          * @return void
 106          */
 107         public function setStoragePath( $storagePath ) {
 108                 $this->storagePath = $storagePath;
 109                 if ( $this->path === false ) {
 110                         $this->path = $storagePath;
 111                 }
 112         }
 113
 114         /**
 115          * Fetch HTML for this transform output
 116          *
 117          * @param array $options Associative array of options. Boolean options
 118          *     should be indicated with a value of true for true, and false or
 119          *     absent for false.
 120          *
 121          *     alt          Alternate text or caption
 122          *     desc-link    Boolean, show a description link
 123          *     file-link    Boolean, show a file download link
 124          *     custom-url-link    Custom URL to link to
 125          *     custom-title-link  Custom Title object to link to
 126          *     valign       vertical-align property, if the output is an inline element
 127          *     img-class    Class applied to the "<img>" tag, if there is such a tag
 128          *
 129          * For images, desc-link and file-link are implemented as a click-through. For
 130          * sounds and videos, they may be displayed in other ways.
 131          *
 132          * @return string
 133          */
 134         abstract public function toHtml( $options = [] );
 135
 136         /**
 137          * This will be overridden to return true in error classes
 138          * @return bool
 139          */
 140         public function isError() {
 141                 return false;
 142         }
 143
 144         /**
 145          * Check if an output thumbnail file actually exists.
 146          *
 147          * This will return false if there was an error, the
 148          * thumbnail is to be handled client-side only, or if
 149          * transformation was deferred via TRANSFORM_LATER.
 150          * This file may exist as a new file in /tmp, a file
 151          * in permanent storage, or even refer to the original.
 152          *
 153          * @return bool
 154          */
 155         public function hasFile() {
 156                 // If TRANSFORM_LATER, $this->path will be false.
 157                 // Note: a null path means "use the source file".
 158                 return ( !$this->isError() && ( $this->path || $this->path === null ) );
 159         }
 160
 161         /**
 162          * Check if the output thumbnail is the same as the source.
 163          * This can occur if the requested width was bigger than the source.
 164          *
 165          * @return bool
 166          */
 167         public function fileIsSource() {
 168                 return ( !$this->isError() && $this->path === null );
 169         }
 170
 171         /**
 172          * Get the path of a file system copy of the thumbnail.
 173          * Callers should never write to this path.
 174          *
 175          * @return string|bool Returns false if there isn't one
 176          */
 177         public function getLocalCopyPath() {
 178                 if ( $this->isError() ) {
 179                         return false;
 180                 } elseif ( $this->path === null ) {
 181                         return $this->file->getLocalRefPath(); // assume thumb was not scaled
 182                 } elseif ( FileBackend::isStoragePath( $this->path ) ) {
 183                         $be = $this->file->getRepo()->getBackend();
 184                         // The temp file will be process cached by FileBackend
 185                         $fsFile = $be->getLocalReference( [ 'src' => $this->path ] );
 186
 187                         return $fsFile ? $fsFile->getPath() : false;
 188                 } else {
 189                         return $this->path; // may return false
 190                 }
 191         }
 192
 193         /**
 194          * Stream the file if there were no errors
 195          *
 196          * @param array $headers Additional HTTP headers to send on success
 197          * @return Status
 198          * @since 1.27
 199          */
 200         public function streamFileWithStatus( $headers = [] ) {
 201                 if ( !$this->path ) {
 202                         return Status::newFatal( 'backend-fail-stream', '<no path>' );
 203                 } elseif ( FileBackend::isStoragePath( $this->path ) ) {
 204                         $be = $this->file->getRepo()->getBackend();
 205                         return $be->streamFile( [ 'src' => $this->path, 'headers' => $headers ] );
 206                 } else { // FS-file
 207                         $success = StreamFile::stream( $this->getLocalCopyPath(), $headers );
 208                         return $success ? Status::newGood() : Status::newFatal( 'backend-fail-stream', $this->path );
 209                 }
 210         }
 211
 212         /**
 213          * Stream the file if there were no errors
 214          *
 215          * @deprecated since 1.26, use streamFileWithStatus
 216          * @param array $headers Additional HTTP headers to send on success
 217          * @return bool Success
 218          */
 219         public function streamFile( $headers = [] ) {
 220                 $this->streamFileWithStatus( $headers )->isOK();
 221         }
 222
 223         /**
 224          * Wrap some XHTML text in an anchor tag with the given attributes
 225          *
 226          * @param array $linkAttribs
 227          * @param string $contents
 228          * @return string
 229          */
 230         protected function linkWrap( $linkAttribs, $contents ) {
 231                 if ( $linkAttribs ) {
 232                         return Xml::tags( 'a', $linkAttribs, $contents );
 233                 } else {
 234                         return $contents;
 235                 }
 236         }
 237
 238         /**
 239          * @param string $title
 240          * @param string|array $params Query parameters to add
 241          * @return array
 242          */
 243         public function getDescLinkAttribs( $title = null, $params = [] ) {
 244                 if ( is_array( $params ) ) {
 245                         $query = $params;
 246                 } else {
 247                         $query = [];
 248                 }
 249                 if ( $this->page && $this->page !== 1 ) {
 250                         $query['page'] = $this->page;
 251                 }
 252                 if ( $this->lang ) {
 253                         $query['lang'] = $this->lang;
 254                 }
 255
 256                 if ( is_string( $params ) && $params !== '' ) {
 257                         $query = $params . '&' . wfArrayToCgi( $query );
 258                 }
 259
 260                 $attribs = [
 261                         'href' => $this->file->getTitle()->getLocalURL( $query ),
 262                         'class' => 'image',
 263                 ];
 264                 if ( $title ) {
 265                         $attribs['title'] = $title;
 266                 }
 267
 268                 return $attribs;
 269         }
 270 }
 271
 272 /**
 273  * Media transform output for images
 274  *
 275  * @ingroup Media
 276  */
 277 class ThumbnailImage extends MediaTransformOutput {
 278         /**
 279          * Get a thumbnail object from a file and parameters.
 280          * If $path is set to null, the output file is treated as a source copy.
 281          * If $path is set to false, no output file will be created.
 282          * $parameters should include, as a minimum, (file) 'width' and 'height'.
 283          * It may also include a 'page' parameter for multipage files.
 284          *
 285          * @param File $file
 286          * @param string $url URL path to the thumb
 287          * @param string|bool $path Filesystem path to the thumb
 288          * @param array $parameters Associative array of parameters
 289          */
 290         function __construct( $file, $url, $path = false, $parameters = [] ) {
 291                 # Previous parameters:
 292                 #   $file, $url, $width, $height, $path = false, $page = false
 293
 294                 $defaults = [
 295                         'page' => false,
 296                         'lang' => false
 297                 ];
 298
 299                 if ( is_array( $parameters ) ) {
 300                         $actualParams = $parameters + $defaults;
 301                 } else {
 302                         # Using old format, should convert. Later a warning could be added here.
 303                         $numArgs = func_num_args();
 304                         $actualParams = [
 305                                 'width' => $path,
 306                                 'height' => $parameters,
 307                                 'page' => ( $numArgs > 5 ) ? func_get_arg( 5 ) : false
 308                         ] + $defaults;
 309                         $path = ( $numArgs > 4 ) ? func_get_arg( 4 ) : false;
 310                 }
 311
 312                 $this->file = $file;
 313                 $this->url = $url;
 314                 $this->path = $path;
 315
 316                 # These should be integers when they get here.
 317                 # If not, there's a bug somewhere.  But let's at
 318                 # least produce valid HTML code regardless.
 319                 $this->width = round( $actualParams['width'] );
 320                 $this->height = round( $actualParams['height'] );
 321
 322                 $this->page = $actualParams['page'];
 323                 $this->lang = $actualParams['lang'];
 324         }
 325
 326         /**
 327          * Return HTML <img ... /> tag for the thumbnail, will include
 328          * width and height attributes and a blank alt text (as required).
 329          *
 330          * @param array $options Associative array of options. Boolean options
 331          *     should be indicated with a value of true for true, and false or
 332          *     absent for false.
 333          *
 334          *     alt          HTML alt attribute
 335          *     title        HTML title attribute
 336          *     desc-link    Boolean, show a description link
 337          *     file-link    Boolean, show a file download link
 338          *     valign       vertical-align property, if the output is an inline element
 339          *     img-class    Class applied to the \<img\> tag, if there is such a tag
 340          *     desc-query   String, description link query params
 341          *     override-width     Override width attribute. Should generally not set
 342          *     override-height    Override height attribute. Should generally not set
 343          *     no-dimensions      Boolean, skip width and height attributes (useful if
 344          *                        set in CSS)
 345          *     custom-url-link    Custom URL to link to
 346          *     custom-title-link  Custom Title object to link to
 347          *     custom target-link Value of the target attribute, for custom-target-link
 348          *     parser-extlink-*   Attributes added by parser for external links:
 349          *          parser-extlink-rel: add rel="nofollow"
 350          *          parser-extlink-target: link target, but overridden by custom-target-link
 351          *
 352          * For images, desc-link and file-link are implemented as a click-through. For
 353          * sounds and videos, they may be displayed in other ways.
 354          *
 355          * @throws MWException
 356          * @return string
 357          */
 358         function toHtml( $options = [] ) {
 359                 if ( count( func_get_args() ) == 2 ) {
 360                         throw new MWException( __METHOD__ . ' called in the old style' );
 361                 }
 362
 363                 $alt = isset( $options['alt'] ) ? $options['alt'] : '';
 364
 365                 $query = isset( $options['desc-query'] ) ? $options['desc-query'] : '';
 366
 367                 $attribs = [
 368                         'alt' => $alt,
 369                         'src' => $this->url,
 370                 ];
 371
 372                 if ( !empty( $options['custom-url-link'] ) ) {
 373                         $linkAttribs = [ 'href' => $options['custom-url-link'] ];
 374                         if ( !empty( $options['title'] ) ) {
 375                                 $linkAttribs['title'] = $options['title'];
 376                         }
 377                         if ( !empty( $options['custom-target-link'] ) ) {
 378                                 $linkAttribs['target'] = $options['custom-target-link'];
 379                         } elseif ( !empty( $options['parser-extlink-target'] ) ) {
 380                                 $linkAttribs['target'] = $options['parser-extlink-target'];
 381                         }
 382                         if ( !empty( $options['parser-extlink-rel'] ) ) {
 383                                 $linkAttribs['rel'] = $options['parser-extlink-rel'];
 384                         }
 385                 } elseif ( !empty( $options['custom-title-link'] ) ) {
 386                         /** @var Title $title */
 387                         $title = $options['custom-title-link'];
 388                         $linkAttribs = [
 389                                 'href' => $title->getLinkURL(),
 390                                 'title' => empty( $options['title'] ) ? $title->getFullText() : $options['title']
 391                         ];
 392                 } elseif ( !empty( $options['desc-link'] ) ) {
 393                         $linkAttribs = $this->getDescLinkAttribs(
 394                                 empty( $options['title'] ) ? null : $options['title'],
 395                                 $query
 396                         );
 397                 } elseif ( !empty( $options['file-link'] ) ) {
 398                         $linkAttribs = [ 'href' => $this->file->getUrl() ];
 399                 } else {
 400                         $linkAttribs = false;
 401                         if ( !empty( $options['title'] ) ) {
 402                                 $attribs['title'] = $options['title'];
 403                         }
 404                 }
 405
 406                 if ( empty( $options['no-dimensions'] ) ) {
 407                         $attribs['width'] = $this->width;
 408                         $attribs['height'] = $this->height;
 409                 }
 410                 if ( !empty( $options['valign'] ) ) {
 411                         $attribs['style'] = "vertical-align: {$options['valign']}";
 412                 }
 413                 if ( !empty( $options['img-class'] ) ) {
 414                         $attribs['class'] = $options['img-class'];
 415                 }
 416                 if ( isset( $options['override-height'] ) ) {
 417                         $attribs['height'] = $options['override-height'];
 418                 }
 419                 if ( isset( $options['override-width'] ) ) {
 420                         $attribs['width'] = $options['override-width'];
 421                 }
 422
 423                 // Additional densities for responsive images, if specified.
 424                 // If any of these urls is the same as src url, it'll be excluded.
 425                 $responsiveUrls = array_diff( $this->responsiveUrls, [ $this->url ] );
 426                 if ( !empty( $responsiveUrls ) ) {
 427                         $attribs['srcset'] = Html::srcSet( $responsiveUrls );
 428                 }
 429
 430                 Hooks::run( 'ThumbnailBeforeProduceHTML', [ $this, &$attribs, &$linkAttribs ] );
 431
 432                 return $this->linkWrap( $linkAttribs, Xml::element( 'img', $attribs ) );
 433         }
 434 }
 435
 436 /**
 437  * Basic media transform error class
 438  *
 439  * @ingroup Media
 440  */
 441 class MediaTransformError extends MediaTransformOutput {
 442         /** @var Message */
 443         private $msg;
 444
 445         function __construct( $msg, $width, $height /*, ... */ ) {
 446                 $args = array_slice( func_get_args(), 3 );
 447                 $this->msg = wfMessage( $msg )->params( $args );
 448                 $this->width = intval( $width );
 449                 $this->height = intval( $height );
 450                 $this->url = false;
 451                 $this->path = false;
 452         }
 453
 454         function toHtml( $options = [] ) {
 455                 return "<div class=\"MediaTransformError\" style=\"" .
 456                         "width: {$this->width}px; height: {$this->height}px; display:inline-block;\">" .
 457                         $this->getHtmlMsg() .
 458                         "</div>";
 459         }
 460
 461         function toText() {
 462                 return $this->msg->text();
 463         }
 464
 465         function getHtmlMsg() {
 466                 return $this->msg->escaped();
 467         }
 468
 469         function getMsg() {
 470                 return $this->msg;
 471         }
 472
 473         function isError() {
 474                 return true;
 475         }
 476
 477         function getHttpStatusCode() {
 478                 return 500;
 479         }
 480 }
 481
 482 /**
 483  * Shortcut class for parameter validation errors
 484  *
 485  * @ingroup Media
 486  */
 487 class TransformParameterError extends MediaTransformError {
 488         function __construct( $params ) {
 489                 parent::__construct( 'thumbnail_error',
 490                         max( isset( $params['width'] ) ? $params['width'] : 0, 120 ),
 491                         max( isset( $params['height'] ) ? $params['height'] : 0, 120 ),
 492                         wfMessage( 'thumbnail_invalid_params' )
 493                 );
 494         }
 495
 496         function getHttpStatusCode() {
 497                 return 400;
 498         }
 499 }
 500
 501 /**
 502  * Shortcut class for parameter file size errors
 503  *
 504  * @ingroup Media
 505  * @since 1.25
 506  */
 507 class TransformTooBigImageAreaError extends MediaTransformError {
 508         function __construct( $params, $maxImageArea ) {
 509                 $msg = wfMessage( 'thumbnail_toobigimagearea' );
 510                 $msg->rawParams(
 511                         $msg->getLanguage()->formatComputingNumbers( $maxImageArea, 1000, "size-$1pixel" )
 512                 );
 513
 514                 parent::__construct( 'thumbnail_error',
 515                         max( isset( $params['width'] ) ? $params['width'] : 0, 120 ),
 516                         max( isset( $params['height'] ) ? $params['height'] : 0, 120 ),
 517                         $msg
 518                 );
 519         }
 520
 521         function getHttpStatusCode() {
 522                 return 400;
 523         }
 524 }