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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Media; |
| 4 | |
| 5 | /** |
| 6 | * Base class for the output of file transformation methods. |
| 7 | * |
| 8 | * @license GPL-2.0-or-later |
| 9 | * @file |
| 10 | * @ingroup Media |
| 11 | */ |
| 12 | |
| 13 | use MediaWiki\FileRepo\File\File; |
| 14 | use MediaWiki\Html\Html; |
| 15 | use MediaWiki\Status\Status; |
| 16 | use Wikimedia\FileBackend\FileBackend; |
| 17 | use Wikimedia\FileBackend\HTTPFileStreamer; |
| 18 | |
| 19 | /** |
| 20 | * Base class for the output of MediaHandler::doTransform() and File::transform(). |
| 21 | * |
| 22 | * @stable to extend |
| 23 | * @ingroup Media |
| 24 | */ |
| 25 | abstract class MediaTransformOutput { |
| 26 | /** @var array Associative array mapping optional supplementary image files |
| 27 | * from pixel density (eg 1.5 or 2) to additional URLs. |
| 28 | */ |
| 29 | public $responsiveUrls = []; |
| 30 | |
| 31 | /** @var File */ |
| 32 | protected $file; |
| 33 | |
| 34 | /** @var int Image width */ |
| 35 | protected $width; |
| 36 | |
| 37 | /** @var int Image height */ |
| 38 | protected $height; |
| 39 | |
| 40 | /** @var string|false URL path to the thumb */ |
| 41 | protected $url; |
| 42 | |
| 43 | /** @var string|false */ |
| 44 | protected $page; |
| 45 | |
| 46 | /** @var string|null|false Filesystem path to the thumb */ |
| 47 | protected $path; |
| 48 | |
| 49 | /** @var string|false Language code, false if not set */ |
| 50 | protected $lang; |
| 51 | |
| 52 | /** @var string|false Permanent storage path */ |
| 53 | protected $storagePath = false; |
| 54 | |
| 55 | /** |
| 56 | * @return int Width of the output box |
| 57 | */ |
| 58 | public function getWidth() { |
| 59 | return $this->width; |
| 60 | } |
| 61 | |
| 62 | /** |
| 63 | * @return int Height of the output box |
| 64 | */ |
| 65 | public function getHeight() { |
| 66 | return $this->height; |
| 67 | } |
| 68 | |
| 69 | /** |
| 70 | * @return File |
| 71 | */ |
| 72 | public function getFile() { |
| 73 | return $this->file; |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * Get the final extension of the thumbnail. |
| 78 | * Returns false for scripted transformations. |
| 79 | * @stable to override |
| 80 | * |
| 81 | * @return string|false |
| 82 | */ |
| 83 | public function getExtension() { |
| 84 | return $this->path ? FileBackend::extensionFromPath( $this->path ) : false; |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * @stable to override |
| 89 | * |
| 90 | * @return string|false The thumbnail URL |
| 91 | */ |
| 92 | public function getUrl() { |
| 93 | if ( $this->url === false ) { |
| 94 | return false; |
| 95 | } |
| 96 | |
| 97 | return $this->getFile()->appendRequestProvenance( $this->url, [ |
| 98 | 'format' => 'thumbnail', |
| 99 | ] ); |
| 100 | } |
| 101 | |
| 102 | /** |
| 103 | * @stable to override |
| 104 | * |
| 105 | * @return string|false The permanent thumbnail storage path |
| 106 | */ |
| 107 | public function getStoragePath() { |
| 108 | return $this->storagePath; |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * @stable to override |
| 113 | * |
| 114 | * @param string $storagePath The permanent storage path |
| 115 | * @return void |
| 116 | */ |
| 117 | public function setStoragePath( $storagePath ) { |
| 118 | $this->storagePath = $storagePath; |
| 119 | if ( $this->path === false ) { |
| 120 | $this->path = $storagePath; |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | /** |
| 125 | * Fetch HTML for this transform output |
| 126 | * |
| 127 | * @param array $options Associative array of options. Boolean options |
| 128 | * should be indicated with a value of true for true, and false or |
| 129 | * absent for false. |
| 130 | * |
| 131 | * - alt : Alternate text or caption |
| 132 | * - desc-link : Boolean, show a description link |
| 133 | * - file-link : Boolean, show a file download link |
| 134 | * - custom-url-link : Custom URL to link to |
| 135 | * - custom-title-link : Custom Title object to link to |
| 136 | * - valign : vertical-align property, if the output is an inline element |
| 137 | * - img-class : Class applied to the `<img>` tag, if there is such a tag |
| 138 | * |
| 139 | * For images, desc-link and file-link are implemented as a click-through. For |
| 140 | * sounds and videos, they may be displayed in other ways. |
| 141 | * |
| 142 | * @return string |
| 143 | */ |
| 144 | abstract public function toHtml( $options = [] ); |
| 145 | |
| 146 | /** |
| 147 | * This will be overridden to return true in error classes |
| 148 | * @return bool |
| 149 | */ |
| 150 | public function isError() { |
| 151 | return false; |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * Check if an output thumbnail file actually exists. |
| 156 | * |
| 157 | * This will return false if there was an error, the |
| 158 | * thumbnail is to be handled client-side only, or if |
| 159 | * transformation was deferred via TRANSFORM_LATER. |
| 160 | * This file may exist as a new file in /tmp, a file |
| 161 | * in permanent storage, or even refer to the original. |
| 162 | * |
| 163 | * @return bool |
| 164 | */ |
| 165 | public function hasFile() { |
| 166 | // If TRANSFORM_LATER, $this->path will be false. |
| 167 | // Note: a null path means "use the source file". |
| 168 | return ( !$this->isError() && ( $this->path || $this->path === null ) ); |
| 169 | } |
| 170 | |
| 171 | /** |
| 172 | * Check if the output thumbnail is the same as the source. |
| 173 | * This can occur if the requested width was bigger than the source. |
| 174 | * |
| 175 | * @return bool |
| 176 | */ |
| 177 | public function fileIsSource() { |
| 178 | return ( !$this->isError() && $this->path === null ); |
| 179 | } |
| 180 | |
| 181 | /** |
| 182 | * Get the path of a file system copy of the thumbnail. |
| 183 | * Callers should never write to this path. |
| 184 | * |
| 185 | * @return string|false Returns false if there isn't one |
| 186 | */ |
| 187 | public function getLocalCopyPath() { |
| 188 | if ( $this->isError() ) { |
| 189 | return false; |
| 190 | } |
| 191 | |
| 192 | if ( $this->path === null ) { |
| 193 | // assume thumb was not scaled |
| 194 | return $this->file->getLocalRefPath(); |
| 195 | } |
| 196 | if ( FileBackend::isStoragePath( $this->path ) ) { |
| 197 | $be = $this->file->getRepo()->getBackend(); |
| 198 | // The temp file is process-cached by FileBackend |
| 199 | $fsFile = $be->getLocalReference( [ 'src' => $this->path ] ); |
| 200 | |
| 201 | return $fsFile ? $fsFile->getPath() : false; |
| 202 | } |
| 203 | // may return false |
| 204 | return $this->path; |
| 205 | } |
| 206 | |
| 207 | /** |
| 208 | * Stream the file if there were no errors |
| 209 | * |
| 210 | * @param array $headers Additional HTTP headers to send on success |
| 211 | * @return Status |
| 212 | * @since 1.27 |
| 213 | */ |
| 214 | public function streamFileWithStatus( $headers = [] ) { |
| 215 | if ( !$this->path ) { |
| 216 | return Status::newFatal( 'backend-fail-stream', '<no path>' ); |
| 217 | } |
| 218 | |
| 219 | $repo = $this->file->getRepo(); |
| 220 | |
| 221 | if ( $repo && FileBackend::isStoragePath( $this->path ) ) { |
| 222 | return Status::wrap( |
| 223 | $repo->getBackend()->streamFile( |
| 224 | [ 'src' => $this->path, 'headers' => $headers, ] |
| 225 | ) |
| 226 | ); |
| 227 | } |
| 228 | |
| 229 | $streamer = new HTTPFileStreamer( |
| 230 | $this->getLocalCopyPath(), |
| 231 | $repo ? $repo->getBackend()->getStreamerOptions() : [] |
| 232 | ); |
| 233 | |
| 234 | $success = $streamer->stream( $headers ); |
| 235 | |
| 236 | return $success ? Status::newGood() |
| 237 | : Status::newFatal( 'backend-fail-stream', $this->path ); |
| 238 | } |
| 239 | |
| 240 | /** |
| 241 | * Stream the file if there were no errors |
| 242 | * |
| 243 | * @deprecated since 1.26, use streamFileWithStatus; hard-deprecated since 1.47 |
| 244 | * @param array $headers Additional HTTP headers to send on success |
| 245 | * @return bool Success |
| 246 | */ |
| 247 | public function streamFile( $headers = [] ) { |
| 248 | wfDeprecated( __METHOD__, '1.26' ); |
| 249 | return $this->streamFileWithStatus( $headers )->isOK(); |
| 250 | } |
| 251 | |
| 252 | /** |
| 253 | * Wrap some XHTML text in an anchor tag with the given attributes |
| 254 | * or, fallback to a span in the absence thereof. |
| 255 | * |
| 256 | * @param array $linkAttribs |
| 257 | * @param string $contents |
| 258 | * @return string |
| 259 | */ |
| 260 | protected function linkWrap( $linkAttribs, $contents ) { |
| 261 | if ( isset( $linkAttribs['href'] ) ) { |
| 262 | return Html::rawElement( 'a', $linkAttribs, $contents ); |
| 263 | } |
| 264 | return Html::rawElement( 'span', $linkAttribs ?: [], $contents ); |
| 265 | } |
| 266 | |
| 267 | /** |
| 268 | * @param string|null $title |
| 269 | * @param string|array $params Query parameters to add |
| 270 | * @return array |
| 271 | */ |
| 272 | public function getDescLinkAttribs( $title = null, $params = [] ) { |
| 273 | if ( is_array( $params ) ) { |
| 274 | $query = $params; |
| 275 | } else { |
| 276 | $query = []; |
| 277 | } |
| 278 | if ( $this->page && $this->page !== 1 ) { |
| 279 | $query['page'] = $this->page; |
| 280 | } |
| 281 | if ( $this->lang ) { |
| 282 | $query['lang'] = $this->lang; |
| 283 | } |
| 284 | |
| 285 | if ( is_string( $params ) && $params !== '' ) { |
| 286 | $query = $params . '&' . wfArrayToCgi( $query ); |
| 287 | } |
| 288 | |
| 289 | $attribs = [ |
| 290 | 'href' => $this->file->getTitle()->getLocalURL( $query ), |
| 291 | 'class' => 'mw-file-description', |
| 292 | ]; |
| 293 | |
| 294 | if ( $title ) { |
| 295 | $attribs['title'] = $title; |
| 296 | } |
| 297 | |
| 298 | return $attribs; |
| 299 | } |
| 300 | } |
| 301 | |
| 302 | /** @deprecated class alias since 1.46 */ |
| 303 | class_alias( MediaTransformOutput::class, 'MediaTransformOutput' ); |