| 1 |
<?php |
| 2 |
defined('WPINC') OR exit; |
| 3 |
|
| 4 |
/** |
| 5 |
* Thumber wraps the functionality required to |
| 6 |
* generate thumbnails for arbitrary documents. |
| 7 |
* |
| 8 |
* @author drossiter |
| 9 |
*/ |
| 10 |
class DG_Thumber { |
| 11 |
|
| 12 |
/** |
| 13 |
* Returns the default mapping of thumber slug to whether it is active or not. |
| 14 |
* @return array |
| 15 |
*/ |
| 16 |
public static function getDefaultThumbers() { |
| 17 |
$gs_active = (bool)self::getGhostscriptExecutable(); |
| 18 |
$imagick_active = self::isImagickAvailable(); |
| 19 |
|
| 20 |
return array('av' => true, 'gs' => $gs_active, |
| 21 |
'imagick' => $imagick_active, 'google' => false); |
| 22 |
} |
| 23 |
|
| 24 |
/** |
| 25 |
* Wraps generation of thumbnails for various attachment filetypes. |
| 26 |
* |
| 27 |
* @param int $ID Document ID |
| 28 |
* @param int $pg Page number to get thumb from. |
| 29 |
* @return str URL to the thumbnail. |
| 30 |
*/ |
| 31 |
public static function getThumbnail($ID, $pg = 1) { |
| 32 |
static $timeout = false; |
| 33 |
if (false === $timeout) { |
| 34 |
$timeout = time(); |
| 35 |
} |
| 36 |
|
| 37 |
$options = self::getOptions(); |
| 38 |
|
| 39 |
// if we haven't saved a thumb, generate one |
| 40 |
if (!isset($options['thumbs'][$ID])) { |
| 41 |
// prevent page timing out -- generate for no more than 30 sec |
| 42 |
if ((time() - $timeout) > 30) { |
| 43 |
return self::getDefaultThumbnail($ID, $pg); |
| 44 |
} |
| 45 |
|
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// do the processing |
| 47 |
$file = get_attached_file($ID); |
| 48 |
|
| 49 |
foreach (self::getThumbers() as $ext_preg => $thumber) { |
| 50 |
$ext_preg = '!\.(' . $ext_preg . ')$!i'; |
| 51 |
|
| 52 |
if (preg_match($ext_preg, $file) |
| 53 |
&& ($thumb = self::getThumbnailTemplate($thumber, $ID, $pg))) { |
| 54 |
$options['thumbs'][$ID] = array( |
| 55 |
'created_timestamp' => time(), |
| 56 |
'thumb_url' => $thumb['url'], |
| 57 |
'thumb_path' => $thumb['path'], |
| 58 |
'thumber' => $thumber |
| 59 |
); |
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self::setOptions($options); |
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break; |
| 62 |
} |
| 63 |
} |
| 64 |
} |
| 65 |
|
| 66 |
if (!isset($options['thumbs'][$ID]) || false === $options['thumbs'][$ID]) { |
| 67 |
if (!isset($options['thumbs'][$ID])) { |
| 68 |
$options['thumbs'][$ID] = false; |
| 69 |
self::setOptions($options); |
| 70 |
} |
| 71 |
|
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// fallback to default thumb for attachment type |
| 73 |
$url = self::getDefaultThumbnail($ID, $pg); |
| 74 |
} else { |
| 75 |
// use generated thumbnail |
| 76 |
$url = $options['thumbs'][$ID]['thumb_url']; |
| 77 |
} |
| 78 |
|
| 79 |
return $url; |
| 80 |
} |
| 81 |
|
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/*========================================================================== |
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* AUDIO VIDEO THUMBNAILS |
| 84 |
*=========================================================================*/ |
| 85 |
|
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/** |
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* Uses wp_read_video_metadata() and wp_read_audio_metadata() to retrieve |
| 88 |
* an embedded image to use as a thumbnail. |
| 89 |
* |
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* @param str $ID The attachment ID to retrieve thumbnail from. |
| 91 |
* @param int $pg Unused. |
| 92 |
* @return bool|str False on failure, URL to thumb on success. |
| 93 |
*/ |
| 94 |
public static function getAudioVideoThumbnail($ID, $pg = 1) { |
| 95 |
include_once DG_WPADMIN_PATH . 'includes/media.php'; |
| 96 |
|
| 97 |
$attachment = get_post($ID); |
| 98 |
$doc_path = get_attached_file($ID); |
| 99 |
|
| 100 |
if (preg_match('#^video/#', get_post_mime_type($attachment))) { |
| 101 |
$metadata = wp_read_video_metadata($doc_path); |
| 102 |
} |
| 103 |
elseif (preg_match('#^audio/#', get_post_mime_type($attachment))) { |
| 104 |
$metadata = wp_read_audio_metadata($doc_path); |
| 105 |
} |
| 106 |
|
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// unsupported mime type || no embedded image present |
| 108 |
if(!isset($metadata) || empty($metadata['image']['data'])) { |
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return false; |
| 110 |
} |
| 111 |
|
| 112 |
$ext = 'jpg'; |
| 113 |
switch ($metadata['image']['mime']) { |
| 114 |
case 'image/gif': |
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$ext = 'gif'; |
| 116 |
break; |
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case 'image/png': |
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$ext = 'png'; |
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break; |
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} |
| 121 |
|
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$temp_file = self::getTempFile($ext); |
| 123 |
|
| 124 |
if (!$fp = @fopen($temp_file, 'wb')) { |
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DocumentGallery::writeLog(__('Could not open file: ', 'document-gallery') . $temp_file); |
| 126 |
return false; |
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} |
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|
| 129 |
if (!@fwrite($fp, $metadata['image']['data'])) { |
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DocumentGallery::writeLog(__('Could not write file: ', 'document-gallery') . $temp_file); |
| 131 |
fclose($fp); |
| 132 |
return false; |
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} |
| 134 |
|
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fclose($fp); |
| 136 |
|
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return $temp_file; |
| 138 |
} |
| 139 |
|
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/** |
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* @return array All extensions supported by WP Audio Video Media metadata. |
| 142 |
*/ |
| 143 |
private static function getAudioVideoExts() { |
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return array_merge(wp_get_audio_extensions(), wp_get_video_extensions()); |
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} |
| 146 |
|
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/*========================================================================== |
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* IMAGICK THUMBNAILS |
| 149 |
*=========================================================================*/ |
| 150 |
|
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/** |
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* Uses WP_Image_Editor_Imagick to generate thumbnails. |
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* |
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* @param int $ID The attachment ID to retrieve thumbnail from. |
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* @param int $pg The page to get the thumbnail of. |
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* @return bool|str False on failure, URL to thumb on success. |
| 157 |
*/ |
| 158 |
public static function getImagickThumbnail($ID, $pg = 1) { |
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include_once DG_PATH . 'inc/class-image-editor-imagick.php'; |
| 160 |
|
| 161 |
$doc_path = get_attached_file($ID); |
| 162 |
$img = new DG_Image_Editor_Imagick($doc_path, $pg - 1); |
| 163 |
$err = $img->load(); |
| 164 |
if(is_wp_error($err)) { |
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DocumentGallery::writeLog( |
| 166 |
__('Failed to open file in Imagick: ', 'document-gallery') . |
| 167 |
$err->get_error_message()); |
| 168 |
return false; |
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} |
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|
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$temp_file = self::getTempFile(); |
| 172 |
|
| 173 |
$err = $img->save($temp_file, 'image/png'); |
| 174 |
if (is_wp_error($err)) { |
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DocumentGallery::writeLog( |
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__('Failed to save image in Imagick: ', 'document-gallery') . |
| 177 |
$err->get_error_message()); |
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return false; |
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} |
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|
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return $temp_file; |
| 182 |
} |
| 183 |
|
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/** |
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* @return bool Whether WP_Image_Editor_Imagick can be used on this system. |
| 186 |
*/ |
| 187 |
public static function isImagickAvailable() { |
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static $ret = null; |
| 189 |
|
| 190 |
if (is_null($ret)) { |
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include_once DG_WPINC_PATH . 'class-wp-image-editor.php'; |
| 192 |
include_once DG_WPINC_PATH . 'class-wp-image-editor-imagick.php'; |
| 193 |
$ret = WP_Image_Editor_Imagick::test(); |
| 194 |
} |
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|
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return $ret; |
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} |
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|
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/*========================================================================== |
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* GHOSTSCRIPT THUMBNAILS |
| 201 |
*=========================================================================*/ |
| 202 |
|
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/** |
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* Get thumbnail for document with given ID using Ghostscript. Imagick could |
| 205 |
* also handle this, but is *much* slower. |
| 206 |
* |
| 207 |
* @param int $ID The attachment ID to retrieve thumbnail from. |
| 208 |
* @param int $pg The page number to make thumbnail of -- index starts at 1. |
| 209 |
* @return bool|str False on failure, URL to thumb on success. |
| 210 |
*/ |
| 211 |
public static function getGhostscriptThumbnail($ID, $pg = 1) { |
| 212 |
static $gs = null; |
| 213 |
|
| 214 |
if (is_null($gs)) { |
| 215 |
$options = self::getOptions(); |
| 216 |
$gs = $options['gs']; |
| 217 |
|
| 218 |
if (false !== $gs) { |
| 219 |
$gs = escapeshellarg($gs) . ' -sDEVICE=png16m -dFirstPage=%d' |
| 220 |
. ' -dLastPage=%d -dBATCH -dNOPAUSE -dPDFFitPage -sOutputFile=%s %s'; |
| 221 |
} |
| 222 |
} |
| 223 |
|
| 224 |
if (false === $gs) { |
| 225 |
return false; |
| 226 |
} |
| 227 |
|
| 228 |
$doc_path = get_attached_file($ID); |
| 229 |
$temp_path = self::getTempFile(); |
| 230 |
|
| 231 |
exec(sprintf($gs, $pg, $pg, $temp_path, $doc_path), $out, $ret); |
| 232 |
|
| 233 |
if ($ret != 0) { |
| 234 |
DocumentGallery::writeLog(__('Ghostscript failed: ', 'document-gallery') . print_r($out)); |
| 235 |
@unlink($temp_path); |
| 236 |
return false; |
| 237 |
} |
| 238 |
|
| 239 |
return $temp_path; |
| 240 |
} |
| 241 |
|
| 242 |
/** |
| 243 |
* @return array All extensions supported by Ghostscript. |
| 244 |
*/ |
| 245 |
private static function getGhostscriptExts() { |
| 246 |
return array('pdf'); |
| 247 |
} |
| 248 |
|
| 249 |
/** |
| 250 |
* Dynamically determines whether we may call gs through exec(). |
| 251 |
* |
| 252 |
* NOTE: This does not check the options for gs path. Don't use in |
| 253 |
* thumbnail generation as it's slow and not configurable. |
| 254 |
* |
| 255 |
* @return bool|str If available, returns exe path. False otherwise. |
| 256 |
*/ |
| 257 |
public static function getGhostscriptExecutable() { |
| 258 |
static $executable = null; |
| 259 |
|
| 260 |
if (is_null($executable)) { |
| 261 |
// we must be able to exec() |
| 262 |
$executable = self::isExecAvailable(); |
| 263 |
if (!$executable) return $executable; |
| 264 |
|
| 265 |
// find on Windows system |
| 266 |
if ('WIN' === strtoupper(substr(PHP_OS, 0, 3))) { |
| 267 |
// look for environment variable |
| 268 |
$executable = getenv('GSC'); |
| 269 |
if ($executable) return $executable; |
| 270 |
|
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// hope GS in the path |
| 272 |
$executable = exec('where gswin*c.exe'); |
| 273 |
if (!empty($executable)) return $executable; |
| 274 |
|
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// look directly in filesystem |
| 276 |
// 64- or 32-bit binary |
| 277 |
$executable = exec('dir /o:n/s/b "C:\Program Files\gs\*gswin*c.exe"'); |
| 278 |
if (!empty($executable)) { |
| 279 |
return $executable; |
| 280 |
} |
| 281 |
|
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// 32-bit binary on 64-bit OS |
| 283 |
$executable = exec('dir /o:n/s/b "C:\Program Files (x86)\gs\*gswin32c.exe"'); |
| 284 |
$executable = empty($executable) ? false : $executable; |
| 285 |
return $executable; |
| 286 |
} |
| 287 |
|
| 288 |
// this is why I use Linux... |
| 289 |
$executable = exec('which gs'); |
| 290 |
$executable = empty($executable) ? false : $executable; |
| 291 |
return $executable; |
| 292 |
} |
| 293 |
|
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return $executable; |
| 295 |
} |
| 296 |
|
| 297 |
/** |
| 298 |
* @return bool Whether we can use the GS executable. |
| 299 |
*/ |
| 300 |
public static function isGhostscriptAvailable() { |
| 301 |
static $ret = null; |
| 302 |
|
| 303 |
if (is_null($ret)) { |
| 304 |
$options = self::getOptions(); |
| 305 |
$ret = $options['gs'] && self::isExecAvailable(); |
| 306 |
} |
| 307 |
|
| 308 |
return $ret; |
| 309 |
} |
| 310 |
|
| 311 |
/*========================================================================== |
| 312 |
* GOOGLE DRIVE VIEWER THUMBNAILS |
| 313 |
*=========================================================================*/ |
| 314 |
|
| 315 |
/** |
| 316 |
* Get thumbnail for document with given ID from Google Drive Viewer. |
| 317 |
* |
| 318 |
* NOTE: Caller must verify that extension is supported. |
| 319 |
* |
| 320 |
* @param str $ID The attachment ID to retrieve thumbnail for. |
| 321 |
* @param int $pg The page number to make thumbnail of -- index starts at 1. |
| 322 |
* @return bool|str False on failure, URL to thumb on success. |
| 323 |
*/ |
| 324 |
public static function getGoogleDriveThumbnail($ID_URL, $pg = 1) { |
| 325 |
// User agent for Lynx 2.8.7rel.2 -- Why? Because I can. |
| 326 |
static $user_agent = 'Lynx/2.8.7rel.2 libwww-FM/2.14 SSL-MM/1.4.1 OpenSSL/1.0.0a'; |
| 327 |
static $timeout = 60; |
| 328 |
|
| 329 |
$google_viewer = 'https://docs.google.com/viewer?url=%s&a=bi&pagenumber=%d&w=%d'; |
| 330 |
$doc_url = wp_get_attachment_url($ID_URL); |
| 331 |
if (!$doc_url) { |
| 332 |
return false; |
| 333 |
} |
| 334 |
|
| 335 |
$temp_file = self::getTempFile(); |
| 336 |
|
| 337 |
// args for use in HTTP request |
| 338 |
$args = array( |
| 339 |
'timeout' => $timeout, // these requests can take a LONG time |
| 340 |
'redirection' => 5, |
| 341 |
'httpversion' => '1.0', |
| 342 |
'user-agent' => $user_agent, |
| 343 |
'blocking' => true, |
| 344 |
'headers' => array(), |
| 345 |
'cookies' => array(), |
| 346 |
'body' => null, |
| 347 |
'compress' => false, |
| 348 |
'decompress' => true, |
| 349 |
'sslverify' => true, |
| 350 |
'stream' => true, |
| 351 |
'filename' => $temp_file |
| 352 |
); |
| 353 |
|
| 354 |
// prevent PHP timeout before HTTP completes |
| 355 |
set_time_limit($timeout); |
| 356 |
|
| 357 |
$options = self::getOptions(); |
| 358 |
$google_viewer = sprintf($google_viewer, urlencode($doc_url), (int)$pg, $options['width']); |
| 359 |
|
| 360 |
// get thumbnail from Google Drive Viewer & check for error on return |
| 361 |
$response = wp_remote_get($google_viewer, $args); |
| 362 |
|
| 363 |
if (is_wp_error($response) || !preg_match('/[23][0-9]{2}/', $response['response']['code'])) { |
| 364 |
DocumentGallery::writeLog(__('Failed to retrieve thumbnail from Google: ', 'document-gallery') . |
| 365 |
(is_wp_error($response) |
| 366 |
? $response->get_error_message() |
| 367 |
: $response['response']['message'])); |
| 368 |
|
| 369 |
@unlink($temp_file); |
| 370 |
return false; |
| 371 |
} |
| 372 |
|
| 373 |
return $temp_file; |
| 374 |
} |
| 375 |
|
| 376 |
/** |
| 377 |
* @return array All extensions supported by Google Drive Viewer. |
| 378 |
*/ |
| 379 |
private static function getGoogleDriveExts() { |
| 380 |
return array( |
| 381 |
'tiff', 'bmp', 'doc', 'docx', 'xls', 'xlsx', 'ppt', 'pptx', |
| 382 |
'pdf', 'pages', 'ai', 'psd', 'dxf', 'svg', 'eps', 'ps', 'ttf' |
| 383 |
); |
| 384 |
} |
| 385 |
|
| 386 |
/** |
| 387 |
* TODO: Currently always returns true. |
| 388 |
* @return bool Whether Google Drive can access files on this system. |
| 389 |
*/ |
| 390 |
public static function isGoogleDriveAvailable() { |
| 391 |
return true; |
| 392 |
} |
| 393 |
|
| 394 |
/*========================================================================== |
| 395 |
* DEFAULT THUMBNAILS |
| 396 |
*=========================================================================*/ |
| 397 |
|
| 398 |
/** |
| 399 |
* Get thumbnail for document with given ID from default images. |
| 400 |
* |
| 401 |
* @param str $ID The attachment ID to retrieve thumbnail from. |
| 402 |
* @param int $pg Unused. |
| 403 |
* @return str URL to thumbnail. |
| 404 |
*/ |
| 405 |
public static function getDefaultThumbnail($ID, $pg = 1) { |
| 406 |
$options = self::getOptions(); |
| 407 |
$width = $options['width']; |
| 408 |
$height = $options['height']; |
| 409 |
$icon_url = DG_URL . 'assets/icons/'; |
| 410 |
|
| 411 |
$url = wp_get_attachment_url($ID); |
| 412 |
$ext = self::getExt($url); |
| 413 |
|
| 414 |
// handle images |
| 415 |
if ($icon = image_downsize($ID, array($width, $height))) { |
| 416 |
$icon = $icon[0]; |
| 417 |
} |
| 418 |
// default extension icon |
| 419 |
elseif ($name = self::getDefaultIcon($ext)) { |
| 420 |
$icon = $icon_url . $name; |
| 421 |
} |
| 422 |
// fallback to standard WP icons |
| 423 |
elseif (!$icon = wp_mime_type_icon($ID)) { |
| 424 |
// everything failed. This is bad... |
| 425 |
$icon = $icon_url . 'missing.png'; |
| 426 |
} |
| 427 |
|
| 428 |
return $icon; |
| 429 |
} |
| 430 |
|
| 431 |
/** |
| 432 |
* Returns the name of the image to represent the filetype given. |
| 433 |
* |
| 434 |
* @param str $ext |
| 435 |
* @return str |
| 436 |
*/ |
| 437 |
private static function getDefaultIcon($ext) { |
| 438 |
// Maps file ext to default image name. |
| 439 |
static $exts = array( |
| 440 |
// Most Common First |
| 441 |
'pdf' => 'pdf.png', |
| 442 |
|
| 443 |
// MS Office |
| 444 |
'doc|docx|docm|dotx|dotm' => 'msdoc.png', |
| 445 |
'ppt|pot|pps|pptx|pptm|ppsx|ppsm|potx|potm|ppam|sldx|sldm' => 'msppt.png', |
| 446 |
'xla|xls|xlt|xlw|xlsx|xlsm|xlsb|xltx|xltm|xlam' => 'msxls.png', |
| 447 |
'mdb' => 'msaccess.png', |
| 448 |
|
| 449 |
// iWork |
| 450 |
'key' => 'key.png', |
| 451 |
'numbers' => 'numbers.png', |
| 452 |
'pages' => 'pages.png', |
| 453 |
|
| 454 |
// Images |
| 455 |
'jpg|jpeg|jpe|gif|png|bmp|tif|tiff|ico' => 'image.png', |
| 456 |
|
| 457 |
// Video formats |
| 458 |
'asf|asx|wmv|wmx|wm|avi|divx|flv|mov' => 'video.png', |
| 459 |
'qt|mpeg|mpg|mpe|mp4|m4v|ogv|webm|mkv' => 'video.png', |
| 460 |
|
| 461 |
// Audio formats |
| 462 |
'mp3|m4a|m4b|ra|ram|wav|ogg|oga|wma|wax|mka' => 'audio.png', |
| 463 |
'midi|mid' => 'midi.png', |
| 464 |
|
| 465 |
// Text formats |
| 466 |
'txt|tsv|csv' => 'text.png', |
| 467 |
'rtx' => 'rtx.png', |
| 468 |
'rtf' => 'rtf.png', |
| 469 |
'ics' => 'ics.png', |
| 470 |
'wp|wpd' => 'wordperfect.png', |
| 471 |
|
| 472 |
// Programming |
| 473 |
'html|htm' => 'html.png', |
| 474 |
'css' => 'css.png', |
| 475 |
'js' => 'javascript.png', |
| 476 |
'class' => 'java.png', |
| 477 |
'asc' => 'asc.png', |
| 478 |
'c' => 'c.png', |
| 479 |
'cc|cpp' => 'cpp.png', |
| 480 |
'h' => 'h.png', |
| 481 |
|
| 482 |
// Msc application formats |
| 483 |
'zip|tar|gzip|gz|bz2|tgz|7z|rar' => 'compressed.png', |
| 484 |
'exe' => 'exec.png', |
| 485 |
'swf' => 'shockwave.png', |
| 486 |
|
| 487 |
// OpenDocument formats |
| 488 |
'odt' => 'opendocument-text.png', |
| 489 |
'odp' => 'opendocument-presentation.png', |
| 490 |
'ods' => 'opendocument-spreadsheet.png', |
| 491 |
'odg' => 'opendocument-graphics.png', |
| 492 |
'odb' => 'opendocument-database.png', |
| 493 |
'odf' => 'opendocument-formula.png' |
| 494 |
); |
| 495 |
|
| 496 |
foreach ($exts as $ext_preg => $icon) { |
| 497 |
$ext_preg = '!(' . $ext_preg . ')$!i'; |
| 498 |
if (preg_match($ext_preg, $ext)) { |
| 499 |
return $icon; |
| 500 |
} |
| 501 |
} |
| 502 |
|
| 503 |
return false; |
| 504 |
} |
| 505 |
|
| 506 |
/*========================================================================== |
| 507 |
* GENERAL THUMBNAIL HELPER FUNCTIONS |
| 508 |
*=========================================================================*/ |
| 509 |
|
| 510 |
/** |
| 511 |
* @return array WP_Post objects for each attachment that has been processed. |
| 512 |
*/ |
| 513 |
public static function getThumbed() { |
| 514 |
$options = self::getOptions(); |
| 515 |
$args = array( |
| 516 |
'post_type' => 'attachment', |
| 517 |
'post_status' => 'inherit', |
| 518 |
'post_per_page' => -1, |
| 519 |
'post__in' => array_keys($options['thumbs']) |
| 520 |
); |
| 521 |
|
| 522 |
return count($args['post__in']) ? get_posts($args) : array(); |
| 523 |
} |
| 524 |
|
| 525 |
/** |
| 526 |
* Key: Attachment ID |
| 527 |
* Val: array |
| 528 |
* + created_timestamp - When the thumbnail was generated. |
| 529 |
* + thumb_path - System path to thumbnail image. |
| 530 |
* + thumb_url - URL pointing to the thumbnail for this document. |
| 531 |
* + thumber - Generator used to create thumb OR false if failed to gen. |
| 532 |
* @return array|null Thumber options from DB or null if options not initialized. |
| 533 |
*/ |
| 534 |
public static function getOptions() { |
| 535 |
global $dg_options; |
| 536 |
return !empty($dg_options) && isset($dg_options['thumber']) |
| 537 |
? $dg_options['thumber'] |
| 538 |
: null; |
| 539 |
} |
| 540 |
|
| 541 |
/** |
| 542 |
* Key: Attachment ID |
| 543 |
* Val: array |
| 544 |
* + created_timestamp - When the thumbnail was generated. |
| 545 |
* + thumb_path - System path to thumbnail image. |
| 546 |
* + thumb_url - URL pointing to the thumbnail for this document. |
| 547 |
* + thumber - Generator used to create thumb OR false if failed to gen. |
| 548 |
* @param array $options Thumber options to store in DB |
| 549 |
*/ |
| 550 |
private static function setOptions($options) { |
| 551 |
global $dg_options; |
| 552 |
$dg_options['thumber'] = $options; |
| 553 |
update_option(DG_OPTION_NAME, $dg_options); |
| 554 |
} |
| 555 |
|
| 556 |
/** |
| 557 |
* @filter dg_thumbers Allows developers to filter the Thumbers used |
| 558 |
* for specific filetypes. Index is the regex to match file extensions |
| 559 |
* supported and the value is anything that can be accepted by call_user_func(). |
| 560 |
* The function must take two parameters, 1st is the int ID of the attachment |
| 561 |
* to get a thumbnail for, 2nd is the page to take a thumbnail of |
| 562 |
* (may not be relevant for some filetypes). |
| 563 |
* |
| 564 |
* @return array |
| 565 |
*/ |
| 566 |
private static function getThumbers() { |
| 567 |
static $thumbers = false; |
| 568 |
|
| 569 |
if (false === $thumbers) { |
| 570 |
$options = self::getOptions(); |
| 571 |
$active = $options['active']; |
| 572 |
$thumbers = array(); |
| 573 |
|
| 574 |
// Audio/Video embedded images |
| 575 |
if ($active['av']) { |
| 576 |
$exts = implode('|', self::getAudioVideoExts()); |
| 577 |
$thumbers[$exts] = array(__CLASS__, 'getAudioVideoThumbnail'); |
| 578 |
} |
| 579 |
|
| 580 |
// Ghostscript |
| 581 |
if ($active['gs'] && false !== self::getGhostscriptExecutable()) { |
| 582 |
$exts = implode('|', self::getGhostscriptExts()); |
| 583 |
$thumbers[$exts] = array(__CLASS__, 'getGhostscriptThumbnail'); |
| 584 |
} |
| 585 |
|
| 586 |
// Imagick |
| 587 |
if ($active['imagick'] && self::isImagickAvailable()) { |
| 588 |
include_once DG_PATH . 'inc/class-image-editor-imagick.php'; |
| 589 |
if ($exts = DG_Image_Editor_Imagick::query_formats()) { |
| 590 |
$exts = implode('|', $exts); |
| 591 |
$thumbers[$exts] = array(__CLASS__, 'getImagickThumbnail'); |
| 592 |
} |
| 593 |
} |
| 594 |
|
| 595 |
// Google Drive Viewer |
| 596 |
if ($active['google']) { |
| 597 |
$exts = implode('|', self::getGoogleDriveExts()); |
| 598 |
$thumbers[$exts] = array(__CLASS__, 'getGoogleDriveThumbnail'); |
| 599 |
} |
| 600 |
|
| 601 |
// allow users to filter thumbers used |
| 602 |
$thumbers = apply_filters('dg_thumbers', $thumbers); |
| 603 |
|
| 604 |
// strip out anything that can't be called |
| 605 |
$thumbers = array_filter($thumbers, 'is_callable'); |
| 606 |
} |
| 607 |
|
| 608 |
return $thumbers; |
| 609 |
} |
| 610 |
|
| 611 |
/** |
| 612 |
* Template that handles generating a thumbnail. |
| 613 |
* |
| 614 |
* @param callable $generator Takes ID and pg and returns path to temp file or false. |
| 615 |
* @param int $ID ID for the attachment that we need a thumbnail for. |
| 616 |
* @param int $pg Page number of the attachment to get a thumbnail for. |
| 617 |
* @return bool|array Array containing 'url' and 'path' values or false. |
| 618 |
*/ |
| 619 |
public static function getThumbnailTemplate($generator, $ID, $pg = 1) { |
| 620 |
// delegate thumbnail generation to $generator |
| 621 |
if (false === ($temp_path = call_user_func($generator, $ID, $pg))) { |
| 622 |
return false; |
| 623 |
} |
| 624 |
|
| 625 |
// get some useful stuff |
| 626 |
$doc_path = get_attached_file($ID); |
| 627 |
$doc_url = wp_get_attachment_url($ID); |
| 628 |
$dirname = dirname($doc_path); |
| 629 |
$basename = basename($doc_path); |
| 630 |
if (false === ($len = strrpos($basename, '.'))) { |
| 631 |
$len = strlen($basename); |
| 632 |
} |
| 633 |
$extless = substr($basename, 0, $len); |
| 634 |
$ext = self::getExt($temp_path); |
| 635 |
|
| 636 |
$thumb_name = self::getUniqueThumbName($dirname, $extless, $ext); |
| 637 |
$thumb_path = $dirname . DIRECTORY_SEPARATOR . $thumb_name; |
| 638 |
|
| 639 |
// scale generated image down |
| 640 |
$img = wp_get_image_editor($temp_path); |
| 641 |
|
| 642 |
if (is_wp_error($img)) { |
| 643 |
DocumentGallery::writeLog( |
| 644 |
__('Failed to get image editor: ', 'document-gallery') . |
| 645 |
$img->get_error_message()); |
| 646 |
return false; |
| 647 |
} |
| 648 |
|
| 649 |
$options = self::getOptions(); |
| 650 |
$img->resize($options['width'], $options['height'], false); |
| 651 |
$err = $img->save($thumb_path); |
| 652 |
|
| 653 |
if (is_wp_error($err)) { |
| 654 |
DocumentGallery::writeLog( |
| 655 |
__('Failed to save image: ', 'document-gallery') . |
| 656 |
$err->get_error_message()); |
| 657 |
return false; |
| 658 |
} |
| 659 |
|
| 660 |
// do some cleanup |
| 661 |
@unlink($temp_path); |
| 662 |
self::deleteThumbMeta($ID); |
| 663 |
|
| 664 |
return array( |
| 665 |
'path' => $thumb_path, |
| 666 |
'url' => preg_replace('#'.preg_quote($basename).'$#', $thumb_name, $doc_url)); |
| 667 |
} |
| 668 |
|
| 669 |
/** |
| 670 |
* Caller should handle removal of the temp file when finished. |
| 671 |
* |
| 672 |
* @staticvar int $count |
| 673 |
* @param str $ext |
| 674 |
*/ |
| 675 |
private static function getTempFile($ext = 'png') { |
| 676 |
static $base = null; |
| 677 |
static $tmp; |
| 678 |
|
| 679 |
if (is_null($base)) { |
| 680 |
$base = md5(time()); |
| 681 |
$tmp = untrailingslashit(get_temp_dir()); |
| 682 |
} |
| 683 |
|
| 684 |
return $tmp . DIRECTORY_SEPARATOR . wp_unique_filename($tmp, "$base.$ext"); |
| 685 |
} |
| 686 |
|
| 687 |
/** |
| 688 |
* Constructs name for file's thumbnail, ensuring that it does not conflict |
| 689 |
* with any existing file. |
| 690 |
* |
| 691 |
* @param str $dirname Directory where the document is located. |
| 692 |
* @param str $extless Base name, less the extension. |
| 693 |
* @param str $ext The extension of the image to be created. |
| 694 |
* @return str Name unique within the directory given, derived from the basename given. |
| 695 |
*/ |
| 696 |
private static function getUniqueThumbName($dirname, $extless, $ext = 'png') { |
| 697 |
return wp_unique_filename($dirname, str_replace('.', '-', $extless) . '-thumb.' . $ext); |
| 698 |
} |
| 699 |
|
| 700 |
/** |
| 701 |
* Removes the existing thumbnail/document meta for the attachment |
| 702 |
* with $ID, if such a thumbnail exists. |
| 703 |
* |
| 704 |
* @param int $ID |
| 705 |
*/ |
| 706 |
public static function deleteThumbMeta($ID) { |
| 707 |
$options = self::getOptions(); |
| 708 |
|
| 709 |
if (isset($options['thumbs'][$ID])) { |
| 710 |
if (false !== $options['thumbs'][$ID]) { |
| 711 |
@unlink($options['thumbs'][$ID]['thumb_path']); |
| 712 |
} |
| 713 |
|
| 714 |
unset($options['thumbs'][$ID]); |
| 715 |
self::setOptions($options); |
| 716 |
} |
| 717 |
} |
| 718 |
|
| 719 |
/** |
| 720 |
* Checks whether exec() may be used. |
| 721 |
* Source: http://stackoverflow.com/a/12980534/866618 |
| 722 |
* |
| 723 |
* @return bool Whether exec() is available. |
| 724 |
*/ |
| 725 |
public static function isExecAvailable() { |
| 726 |
static $available = null; |
| 727 |
|
| 728 |
if (is_null($available)) { |
| 729 |
$available = true; |
| 730 |
|
| 731 |
if (ini_get('safe_mode')) { |
| 732 |
$available = false; |
| 733 |
} else { |
| 734 |
$d = ini_get('disable_functions'); |
| 735 |
$s = ini_get('suhosin.executor.func.blacklist'); |
| 736 |
if ("$d$s") { |
| 737 |
$array = preg_split('/,\s*/', "$d,$s"); |
| 738 |
$available = !in_array('exec', $array); |
| 739 |
} |
| 740 |
} |
| 741 |
} |
| 742 |
|
| 743 |
return $available; |
| 744 |
} |
| 745 |
|
| 746 |
/** |
| 747 |
* Formerly achieved with wp_check_filetype(), but it was only returning |
| 748 |
* valid results if the active user had permission to upload the given filetype. |
| 749 |
* |
| 750 |
* @param str $filename Name of the file to get extension from. |
| 751 |
* @return str|bool Returns the file extension on success, false on failure. |
| 752 |
*/ |
| 753 |
private static function getExt($filename) { |
| 754 |
foreach (wp_get_mime_types() as $ext_preg => $unused) { |
| 755 |
$ext_preg = '!\.(' . $ext_preg . ')$!i'; |
| 756 |
if (preg_match($ext_preg, $filename, $ext_matches)) { |
| 757 |
return $ext_matches[1]; |
| 758 |
} |
| 759 |
} |
| 760 |
|
| 761 |
return false; |
| 762 |
} |
| 763 |
|
| 764 |
/** |
| 765 |
* Blocks instantiation. All functions are static. |
| 766 |
*/ |
| 767 |
private function __construct() { |
| 768 |
|
| 769 |
} |
| 770 |
} |
| 771 |
|
| 772 |
?> |
