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PhabricatorFileTransformController.php
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Sun, Jan 5, 08:55

PhabricatorFileTransformController.php
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<?php
final class PhabricatorFileTransformController
extends PhabricatorFileController {
private $transform;
private $phid;
private $key;
public function shouldRequireLogin() {
return false;
}
public function willProcessRequest(array $data) {
$this->transform = $data['transform'];
$this->phid = $data['phid'];
$this->key = $data['key'];
}
public function processRequest() {
$viewer = $this->getRequest()->getUser();
// NOTE: This is a public/CDN endpoint, and permission to see files is
// controlled by knowing the secret key, not by authentication.
$file = id(new PhabricatorFileQuery())
->setViewer(PhabricatorUser::getOmnipotentUser())
->withPHIDs(array($this->phid))
->executeOne();
if (!$file) {
return new Aphront404Response();
}
if (!$file->validateSecretKey($this->key)) {
return new Aphront403Response();
}
$xform = id(new PhabricatorTransformedFile())
->loadOneWhere(
'originalPHID = %s AND transform = %s',
$this->phid,
$this->transform);
if ($xform) {
return $this->buildTransformedFileResponse($xform);
}
$type = $file->getMimeType();
if (!$file->isViewableInBrowser() || !$file->isTransformableImage()) {
return $this->buildDefaultTransformation($file);
}
// We're essentially just building a cache here and don't need CSRF
// protection.
$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
switch ($this->transform) {
case 'thumb-profile':
$xformed_file = $this->executeThumbTransform($file, 50, 50);
break;
case 'thumb-280x210':
$xformed_file = $this->executeThumbTransform($file, 280, 210);
break;
case 'thumb-220x165':
$xformed_file = $this->executeThumbTransform($file, 220, 165);
break;
case 'preview-140':
$xformed_file = $this->executePreviewTransform($file, 140);
break;
case 'preview-220':
$xformed_file = $this->executePreviewTransform($file, 220);
break;
case 'thumb-160x120':
$xformed_file = $this->executeThumbTransform($file, 160, 120);
break;
case 'thumb-60x45':
$xformed_file = $this->executeThumbTransform($file, 60, 45);
break;
default:
return new Aphront400Response();
}
if (!$xformed_file) {
return new Aphront400Response();
}
$xform = new PhabricatorTransformedFile();
$xform->setOriginalPHID($this->phid);
$xform->setTransform($this->transform);
$xform->setTransformedPHID($xformed_file->getPHID());
$xform->save();
return $this->buildTransformedFileResponse($xform);
}
private function buildDefaultTransformation(PhabricatorFile $file) {
static $regexps = array(
'@application/zip@' => 'zip',
'@image/@' => 'image',
'@application/pdf@' => 'pdf',
'@.*@' => 'default',
);
$type = $file->getMimeType();
$prefix = 'default';
foreach ($regexps as $regexp => $implied_prefix) {
if (preg_match($regexp, $type)) {
$prefix = $implied_prefix;
break;
}
}
switch ($this->transform) {
case 'thumb-160x120':
$suffix = '160x120';
break;
case 'thumb-60x45':
$suffix = '60x45';
break;
default:
throw new Exception('Unsupported transformation type!');
}
$path = celerity_get_resource_uri(
"/rsrc/image/icon/fatcow/thumbnails/{$prefix}{$suffix}.png");
return id(new AphrontRedirectResponse())
->setURI($path);
}
private function buildTransformedFileResponse(
PhabricatorTransformedFile $xform) {
$file = id(new PhabricatorFileQuery())
->setViewer(PhabricatorUser::getOmnipotentUser())
->withPHIDs(array($xform->getTransformedPHID()))
->executeOne();
if (!$file) {
return new Aphront404Response();
}
// TODO: We could just delegate to the file view controller instead,
// which would save the client a roundtrip, but is slightly more complex.
$uri = $file->getBestURI();
return id(new AphrontRedirectResponse())->setURI($uri);
}
private function executePreviewTransform(PhabricatorFile $file, $size) {
$xformer = new PhabricatorImageTransformer();
return $xformer->executePreviewTransform($file, $size);
}
private function executeThumbTransform(PhabricatorFile $file, $x, $y) {
$xformer = new PhabricatorImageTransformer();
return $xformer->executeThumbTransform($file, $x, $y);
}
}

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