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PhabricatorFile.php
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Fri, Jan 3, 21:37

PhabricatorFile.php
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<?php
/*
* Copyright 2012 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.
*/
final class PhabricatorFile extends PhabricatorFileDAO {
const STORAGE_FORMAT_RAW = 'raw';
protected $phid;
protected $name;
protected $mimeType;
protected $byteSize;
protected $authorPHID;
protected $secretKey;
protected $contentHash;
protected $storageEngine;
protected $storageFormat;
protected $storageHandle;
public function getConfiguration() {
return array(
self::CONFIG_AUX_PHID => true,
) + parent::getConfiguration();
}
public function generatePHID() {
return PhabricatorPHID::generateNewPHID(
PhabricatorPHIDConstants::PHID_TYPE_FILE);
}
public static function readUploadedFileData($spec) {
if (!$spec) {
throw new Exception("No file was uploaded!");
}
$err = idx($spec, 'error');
if ($err) {
throw new PhabricatorFileUploadException($err);
}
$tmp_name = idx($spec, 'tmp_name');
$is_valid = @is_uploaded_file($tmp_name);
if (!$is_valid) {
throw new Exception("File is not an uploaded file.");
}
$file_data = Filesystem::readFile($tmp_name);
$file_size = idx($spec, 'size');
if (strlen($file_data) != $file_size) {
throw new Exception("File size disagrees with uploaded size.");
}
return $file_data;
}
public static function newFromPHPUpload($spec, array $params = array()) {
$file_data = self::readUploadedFileData($spec);
$file_name = nonempty(
idx($params, 'name'),
idx($spec, 'name'));
$params = array(
'name' => $file_name,
) + $params;
return self::newFromFileData($file_data, $params);
}
public static function newFromFileData($data, array $params = array()) {
$selector = PhabricatorEnv::newObjectFromConfig('storage.engine-selector');
$engines = $selector->selectStorageEngines($data, $params);
if (!$engines) {
throw new Exception("No valid storage engines are available!");
}
$data_handle = null;
$engine_identifier = null;
foreach ($engines as $engine) {
try {
// Perform the actual write.
$data_handle = $engine->writeFile($data, $params);
if (!$data_handle || strlen($data_handle) > 255) {
// This indicates an improperly implemented storage engine.
throw new Exception(
"Storage engine '{$engine}' executed writeFile() but did not ".
"return a valid handle ('{$data_handle}') to the data: it must ".
"be nonempty and no longer than 255 characters.");
}
$engine_identifier = $engine->getEngineIdentifier();
if (!$engine_identifier || strlen($engine_identifier) > 32) {
throw new Exception(
"Storage engine '{$engine}' returned an improper engine ".
"identifier '{$engine_identifier}': it must be nonempty ".
"and no longer than 32 characters.");
}
// We stored the file somewhere so stop trying to write it to other
// places.
break;
} catch (Exception $ex) {
// If an engine doesn't work, keep trying all the other valid engines
// in case something else works.
phlog($ex);
}
}
if (!$data_handle) {
throw new Exception("All storage engines failed to write file!");
}
$file_name = idx($params, 'name');
$file_name = self::normalizeFileName($file_name);
// If for whatever reason, authorPHID isn't passed as a param
// (always the case with newFromFileDownload()), store a ''
$authorPHID = idx($params, 'authorPHID');
$file = new PhabricatorFile();
$file->setName($file_name);
$file->setByteSize(strlen($data));
$file->setAuthorPHID($authorPHID);
$file->setContentHash(PhabricatorHash::digest($data));
$file->setStorageEngine($engine_identifier);
$file->setStorageHandle($data_handle);
// TODO: This is probably YAGNI, but allows for us to do encryption or
// compression later if we want.
$file->setStorageFormat(self::STORAGE_FORMAT_RAW);
if (isset($params['mime-type'])) {
$file->setMimeType($params['mime-type']);
} else {
$tmp = new TempFile();
Filesystem::writeFile($tmp, $data);
$file->setMimeType(Filesystem::getMimeType($tmp));
}
$file->save();
return $file;
}
public static function newFromFileDownload($uri, $name) {
$uri = new PhutilURI($uri);
$protocol = $uri->getProtocol();
switch ($protocol) {
case 'http':
case 'https':
break;
default:
// Make sure we are not accessing any file:// URIs or similar.
return null;
}
$timeout = stream_context_create(
array(
'http' => array(
'timeout' => 5,
),
));
$file_data = @file_get_contents($uri, false, $timeout);
if ($file_data === false) {
return null;
}
return self::newFromFileData($file_data, array('name' => $name));
}
public static function normalizeFileName($file_name) {
return preg_replace('/[^a-zA-Z0-9.~_-]/', '_', $file_name);
}
public function delete() {
$engine = $this->instantiateStorageEngine();
$ret = parent::delete();
$engine->deleteFile($this->getStorageHandle());
return $ret;
}
public function loadFileData() {
$engine = $this->instantiateStorageEngine();
$data = $engine->readFile($this->getStorageHandle());
switch ($this->getStorageFormat()) {
case self::STORAGE_FORMAT_RAW:
$data = $data;
break;
default:
throw new Exception("Unknown storage format.");
}
return $data;
}
public function getViewURI() {
if (!$this->getPHID()) {
throw new Exception(
"You must save a file before you can generate a view URI.");
}
$name = phutil_escape_uri($this->getName());
$path = '/file/data/'.$this->getSecretKey().'/'.$this->getPHID().'/'.$name;
return PhabricatorEnv::getCDNURI($path);
}
public function getInfoURI() {
return '/file/info/'.$this->getPHID().'/';
}
public function getBestURI() {
if ($this->isViewableInBrowser()) {
return $this->getViewURI();
} else {
return $this->getInfoURI();
}
}
public function getThumb60x45URI() {
return '/file/xform/thumb-60x45/'.$this->getPHID().'/';
}
public function getThumb160x120URI() {
return '/file/xform/thumb-160x120/'.$this->getPHID().'/';
}
public function isViewableInBrowser() {
return ($this->getViewableMimeType() !== null);
}
public function isViewableImage() {
if (!$this->isViewableInBrowser()) {
return false;
}
$mime_map = PhabricatorEnv::getEnvConfig('files.image-mime-types');
$mime_type = $this->getMimeType();
return idx($mime_map, $mime_type);
}
public function isTransformableImage() {
// NOTE: The way the 'gd' extension works in PHP is that you can install it
// with support for only some file types, so it might be able to handle
// PNG but not JPEG. Try to generate thumbnails for whatever we can. Setup
// warns you if you don't have complete support.
$matches = null;
$ok = preg_match(
'@^image/(gif|png|jpe?g)@',
$this->getViewableMimeType(),
$matches);
if (!$ok) {
return false;
}
switch ($matches[1]) {
case 'jpg';
case 'jpeg':
return function_exists('imagejpeg');
break;
case 'png':
return function_exists('imagepng');
break;
case 'gif':
return function_exists('imagegif');
break;
default:
throw new Exception('Unknown type matched as image MIME type.');
}
}
public static function getTransformableImageFormats() {
$supported = array();
if (function_exists('imagejpeg')) {
$supported[] = 'jpg';
}
if (function_exists('imagepng')) {
$supported[] = 'png';
}
if (function_exists('imagegif')) {
$supported[] = 'gif';
}
return $supported;
}
protected function instantiateStorageEngine() {
$engines = id(new PhutilSymbolLoader())
->setType('class')
->setAncestorClass('PhabricatorFileStorageEngine')
->selectAndLoadSymbols();
foreach ($engines as $engine_class) {
$engine = newv($engine_class['name'], array());
if ($engine->getEngineIdentifier() == $this->getStorageEngine()) {
return $engine;
}
}
throw new Exception("File's storage engine could be located!");
}
public function getViewableMimeType() {
$mime_map = PhabricatorEnv::getEnvConfig('files.viewable-mime-types');
$mime_type = $this->getMimeType();
$mime_parts = explode(';', $mime_type);
$mime_type = trim(reset($mime_parts));
return idx($mime_map, $mime_type);
}
public function validateSecretKey($key) {
return ($key == $this->getSecretKey());
}
public function save() {
if (!$this->getSecretKey()) {
$this->setSecretKey($this->generateSecretKey());
}
return parent::save();
}
public function generateSecretKey() {
return Filesystem::readRandomCharacters(20);
}
}

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