/**
* Uses WP_Image_Editor_Imagick to generate thumbnails.
*
* @param int $ID The attachment ID to retrieve thumbnail from.
* @param int $pg The page to get the thumbnail of.
*
* @return bool|string False on failure, URL to thumb on success.
*/
public function getThumbnail($ID, $pg = 1)
{
$doc_path = get_attached_file($ID);
$img = new DG_Image_Editor_Imagick($doc_path, $pg - 1);
$err = $img->load();
if (is_wp_error($err)) {
DG_Logger::writeLog(DG_LogLevel::Error, __('Failed to open file in Imagick: ', 'document-gallery') . $err->get_error_message());
return false;
}
$temp_file = DG_Util::getTempFile();
$err = $img->save($temp_file, 'image/png');
if (is_wp_error($err)) {
DG_Logger::writeLog(DG_LogLevel::Error, __('Failed to save image in Imagick: ', 'document-gallery') . $err->get_error_message());
return false;
}
return $temp_file;
}
/**
* Get thumbnail for document with given ID using Ghostscript. Imagick could
* also handle this, but is *much* slower.
*
* @param int $ID The attachment ID to retrieve thumbnail from.
* @param int $pg The page number to make thumbnail of -- index starts at 1.
*
* @return bool|string False on failure, URL to thumb on success.
*/
public function getThumbnail($ID, $pg = 1)
{
static $gs = null;
if (is_null($gs)) {
$options = DG_Thumber::getOptions();
$gs = $options['gs'];
if (false !== $gs) {
$gs = escapeshellarg($gs) . ' -sDEVICE=png16m -dFirstPage=%1$d' . ' -dLastPage=%1$d -dBATCH -dNOPAUSE -dPDFFitPage -sOutputFile=%2$s %3$s 2>&1';
}
}
if (false === $gs) {
return false;
}
$doc_path = get_attached_file($ID);
$temp_path = DG_Util::getTempFile();
exec(sprintf($gs, $pg, $temp_path, $doc_path), $out, $ret);
if ($ret != 0) {
DG_Logger::writeLog(DG_LogLevel::Error, __('Ghostscript failed: ', 'document-gallery') . print_r($out));
@unlink($temp_path);
return false;
}
return $temp_path;
}
/**
* Uses wp_read_video_metadata() and wp_read_audio_metadata() to retrieve
* an embedded image to use as a thumbnail.
*
* @param string $ID The attachment ID to retrieve thumbnail from.
* @param int $pg Unused.
*
* @return bool|string False on failure, URL to thumb on success.
*/
public function getThumbnail($ID, $pg = 1)
{
include_once DG_WPADMIN_PATH . 'includes/media.php';
$doc_path = get_attached_file($ID);
$mime_type = get_post_mime_type($ID);
if (DG_Util::startsWith($mime_type, 'video/')) {
$metadata = wp_read_video_metadata($doc_path);
} elseif (DG_Util::startsWith($mime_type, 'audio/')) {
$metadata = wp_read_audio_metadata($doc_path);
}
// unsupported mime type || no embedded image present
if (!isset($metadata) || empty($metadata['image']['data'])) {
return false;
}
$ext = 'jpg';
switch ($metadata['image']['mime']) {
case 'image/gif':
$ext = 'gif';
break;
case 'image/png':
$ext = 'png';
break;
}
$temp_file = DG_Util::getTempFile($ext);
if (!($fp = @fopen($temp_file, 'wb'))) {
DG_Logger::writeLog(DG_LogLevel::Error, __('Could not open file: ', 'document-gallery') . $temp_file);
return false;
}
if (!@fwrite($fp, $metadata['image']['data'])) {
DG_Logger::writeLog(DG_LogLevel::Error, __('Could not write file: ', 'document-gallery') . $temp_file);
fclose($fp);
return false;
}
fclose($fp);
return $temp_file;
}
/**
* Processes the POST request, generating a ThumberResponse, validating, and passing the result to $callback.
* If not using client.php as the webhook, whoever receives webhook response should first invoke this method to
* validate response.
*/
public function receiveThumbResponse()
{
$resp = parent::receiveThumbResponse();
if (is_null($resp)) {
return;
}
$nonce = $resp->getNonce();
$split = explode(DG_ThumberCoThumber::NonceSeparator, $nonce);
if ($resp->getSuccess() && count($split) === 2) {
$ID = absint($split[0]);
$tmpfile = DG_Util::getTempFile();
file_put_contents($tmpfile, $resp->getDecodedData());
DG_Thumber::setThumbnail($ID, $tmpfile, array(__CLASS__, 'getThumberThumbnail'));
DG_Logger::writeLog(DG_LogLevel::Detail, "Received thumbnail from Thumber for attachment #{$split[0]}.");
} else {
$ID = count($split) > 0 ? $split[0] : $nonce;
DG_Logger::writeLog(DG_LogLevel::Warning, "Thumber was unable to process attachment #{$ID}: " . $resp->getError());
}
}
