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phab/src/applications/files/controller/transform/PhabricatorFileTransformController.php
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PhabricatorFileTransformController.php
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<?php
/*
* Copyright 2011 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
class PhabricatorFileTransformController extends PhabricatorFileController {
private $transform;
private $phid;
public function willProcessRequest(array $data) {
$this->transform = $data['transform'];
$this->phid = $data['phid'];
}
public function processRequest() {
$xform = id(new PhabricatorTransformedFile())
->loadOneWhere(
'originalPHID = %s AND transform = %s',
$this->phid,
$this->transform);
if ($xform) {
return $this->buildTransformedFileResponse($xform);
}
$file = id(new PhabricatorFile())->loadOneWhere('phid = %s', $this->phid);
if (!$file) {
return new Aphront404Response();
}
if (!$file->isViewableInBrowser()) {
return new Aphront400Response();
}
if (!$file->isTransformableImage()) {
return new Aphront400Response();
}
switch ($this->transform) {
case 'thumb-160x120':
$xformed_file = $this->executeThumbTransform($file, 160, 120);
break;
case 'thumb-60x45':
$xformed_file = $this->executeThumbTransform($file, 60, 45);
break;
case 'profile-50x50':
$xformed_file = $this->executeProfile50x50Transform($file);
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 buildTransformedFileResponse(
PhabricatorTransformedFile $xform) {
// TODO: We could just delegate to the file view controller instead,
// which would save the client a roundtrip, but is slightly more complex.
return id(new AphrontRedirectResponse())->setURI(
PhabricatorFileURI::getViewURIForPHID($xform->getTransformedPHID()));
}
private function executeProfile50x50Transform(PhabricatorFile $file) {
$data = $file->loadFileData();
$jpeg = $this->crudelyScaleTo($data, 50, 50);
return PhabricatorFile::newFromFileData($jpeg, array(
'name' => 'profile-'.$file->getName(),
));
}
private function executeThumbTransform(PhabricatorFile $file, $x, $y) {
$data = $file->loadFileData();
$jpeg = $this->crudelyScaleTo($data, $x, $y);
return PhabricatorFile::newFromFileData($jpeg, array(
'name' => 'thumb-'.$file->getName(),
));
}
/**
* Very crudely scale an image up or down to an exact size.
*/
private function crudelyScaleTo($data, $dx, $dy) {
$src = imagecreatefromstring($data);
$x = imagesx($src);
$y = imagesy($src);
$scale = min($x / $dx, $y / $dy);
$dst = imagecreatetruecolor($dx, $dy);
imagecopyresampled(
$dst,
$src,
0, 0,
0, 0,
$dx, $dy,
$scale * $dx, $scale * $dy);
ob_start();
imagejpeg($dst);
return ob_get_clean();
}
}
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