/**
* Render the image to the output.
*/
public function render()
{
if (!$this->media || !$this->media->canShow()) {
Log::addMediaLog('Image Builder error: >' . I18N::translate('Missing or private media object.'));
$this->renderError();
}
$serverFilename = $this->media->getServerFilename();
if (!file_exists($serverFilename)) {
Log::addMediaLog('Image Builder error: >' . I18N::translate('The media object does not exist.') . '< for path >' . $serverFilename . '<');
$this->renderError();
}
$mimetype = $this->media->mimeType();
$imgsize = $this->media->getImageAttributes();
$filetime = $this->media->getFiletime();
$filetimeHeader = gmdate('D, d M Y H:i:s', $filetime) . ' GMT';
$expireHeader = gmdate('D, d M Y H:i:s', WT_TIMESTAMP + $this->getExpireOffset()) . ' GMT';
$type = Functions::isImageTypeSupported($imgsize['ext']);
$usewatermark = false;
// if this image supports watermarks and the watermark module is intalled...
if ($type) {
$usewatermark = $this->isShowWatermark();
}
// determine whether we have enough memory to watermark this image
if ($usewatermark) {
if (!FunctionsMedia::hasMemoryForImage($serverFilename)) {
// not enough memory to watermark this file
$usewatermark = false;
}
}
$etag = $this->media->getEtag();
// parse IF_MODIFIED_SINCE header from client
$if_modified_since = 'x';
if (!empty(Filter::server('HTTP_IF_MODIFIED_SINCE'))) {
$if_modified_since = preg_replace('/;.*$/', '', Filter::server('HTTP_IF_MODIFIED_SINCE'));
}
// parse IF_NONE_MATCH header from client
$if_none_match = 'x';
if (!empty(Filter::server('HTTP_IF_NONE_MATCH'))) {
$if_none_match = str_replace('"', '', Filter::server('HTTP_IF_NONE_MATCH'));
}
// add caching headers. allow browser to cache file, but not proxy
header('Last-Modified: ' . $filetimeHeader);
header('ETag: "' . $etag . '"');
header('Expires: ' . $expireHeader);
header('Cache-Control: max-age=' . $this->getExpireOffset() . ', s-maxage=0, proxy-revalidate');
// if this file is already in the user’s cache, don’t resend it
// first check if the if_modified_since param matches
if ($if_modified_since === $filetimeHeader) {
// then check if the etag matches
if ($if_none_match === $etag) {
http_response_code(304);
return;
}
}
// send headers for the image
header('Content-Type: ' . $mimetype);
header('Content-Disposition: filename="' . addslashes(basename($this->media->getFilename())) . '"');
if ($usewatermark) {
// generate the watermarked image
$imCreateFunc = 'imagecreatefrom' . $type;
$imSendFunc = 'image' . $type;
if (function_exists($imCreateFunc) && function_exists($imSendFunc)) {
$im = $imCreateFunc($serverFilename);
$im = $this->applyWatermark($im);
// send the image
$imSendFunc($im);
imagedestroy($im);
return;
} else {
// this image is defective. log it
Log::addMediaLog('Image Builder error: >' . I18N::translate('This media file is broken and cannot be watermarked.') . '< in file >' . $serverFilename . '< memory used: ' . memory_get_usage());
}
}
// determine filesize of image (could be original or watermarked version)
$filesize = filesize($serverFilename);
// set content-length header, send file
header('Content-Length: ' . $filesize);
// Some servers disable fpassthru() and readfile()
if (function_exists('readfile')) {
readfile($serverFilename);
} else {
$fp = fopen($serverFilename, 'rb');
if (function_exists('fpassthru')) {
fpassthru($fp);
} else {
while (!feof($fp)) {
echo fread($fp, 65536);
}
}
fclose($fp);
}
}