PhabricatorFile.php
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Created: Mon, May 20, 03:18

PhabricatorFile.php
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	<?php

	/**
	* @group file
	*/
	final class PhabricatorFile extends PhabricatorFileDAO
	implements
	PhabricatorTokenReceiverInterface,
	PhabricatorSubscribableInterface,
	PhabricatorPolicyInterface {

	const STORAGE_FORMAT_RAW = 'raw';

	const METADATA_IMAGE_WIDTH = 'width';
	const METADATA_IMAGE_HEIGHT = 'height';

	protected $name;
	protected $mimeType;
	protected $byteSize;
	protected $authorPHID;
	protected $secretKey;
	protected $contentHash;
	protected $metadata = array();
	protected $mailKey;

	protected $storageEngine;
	protected $storageFormat;
	protected $storageHandle;

	protected $ttl;
	protected $isExplicitUpload = 1;
	protected $viewPolicy = PhabricatorPolicies::POLICY_USER;

	private $objects = self::ATTACHABLE;
	private $objectPHIDs = self::ATTACHABLE;

	public function getConfiguration() {
	return array(
	self::CONFIG_AUX_PHID => true,
	self::CONFIG_SERIALIZATION => array(
	'metadata' => self::SERIALIZATION_JSON,
	),
	) + parent::getConfiguration();
	}

	public function generatePHID() {
	return PhabricatorPHID::generateNewPHID(
	PhabricatorFilePHIDTypeFile::TYPECONST);
	}

	public function save() {
	if (!$this->getSecretKey()) {
	$this->setSecretKey($this->generateSecretKey());
	}
	if (!$this->getMailKey()) {
	$this->setMailKey(Filesystem::readRandomCharacters(20));
	}
	return parent::save();
	}

	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.");
	}

	self::validateFileSize(strlen($file_data));

	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 newFromXHRUpload($data, array $params = array()) {
	self::validateFileSize(strlen($data));
	return self::newFromFileData($data, $params);
	}

	private static function validateFileSize($size) {
	$limit = PhabricatorEnv::getEnvConfig('storage.upload-size-limit');
	if (!$limit) {
	return;
	}

	$limit = phabricator_parse_bytes($limit);
	if ($size > $limit) {
	throw new PhabricatorFileUploadException(-1000);
	}
	}


	/**
	* Given a block of data, try to load an existing file with the same content
	* if one exists. If it does not, build a new file.
	*
	* This method is generally used when we have some piece of semi-trusted data
	* like a diff or a file from a repository that we want to show to the user.
	* We can't just dump it out because it may be dangerous for any number of
	* reasons; instead, we need to serve it through the File abstraction so it
	* ends up on the CDN domain if one is configured and so on. However, if we
	* simply wrote a new file every time we'd potentially end up with a lot
	* of redundant data in file storage.
	*
	* To solve these problems, we use file storage as a cache and reuse the
	* same file again if we've previously written it.
	*
	* NOTE: This method unguards writes.
	*
	* @param string Raw file data.
	* @param dict Dictionary of file information.
	*/
	public static function buildFromFileDataOrHash(
	$data,
	array $params = array()) {

	$file = id(new PhabricatorFile())->loadOneWhere(
	'name = %s AND contentHash = %s LIMIT 1',
	self::normalizeFileName(idx($params, 'name')),
	self::hashFileContent($data));

	if (!$file) {
	$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
	$file = PhabricatorFile::newFromFileData($data, $params);
	unset($unguarded);
	}

	return $file;
	}

	public static function newFileFromContentHash($hash, $params) {

	// Check to see if a file with same contentHash exist
	$file = id(new PhabricatorFile())->loadOneWhere(
	'contentHash = %s LIMIT 1', $hash);

	if ($file) {
	// copy storageEngine, storageHandle, storageFormat
	$copy_of_storage_engine = $file->getStorageEngine();
	$copy_of_storage_handle = $file->getStorageHandle();
	$copy_of_storage_format = $file->getStorageFormat();
	$copy_of_byteSize = $file->getByteSize();
	$copy_of_mimeType = $file->getMimeType();

	$file_name = idx($params, 'name');
	$file_name = self::normalizeFileName($file_name);
	$file_ttl = idx($params, 'ttl');
	$authorPHID = idx($params, 'authorPHID');

	$new_file = new PhabricatorFile();

	$new_file->setName($file_name);
	$new_file->setByteSize($copy_of_byteSize);
	$new_file->setAuthorPHID($authorPHID);
	$new_file->setTtl($file_ttl);

	$new_file->setContentHash($hash);
	$new_file->setStorageEngine($copy_of_storage_engine);
	$new_file->setStorageHandle($copy_of_storage_handle);
	$new_file->setStorageFormat($copy_of_storage_format);
	$new_file->setMimeType($copy_of_mimeType);
	$new_file->copyDimensions($file);

	$new_file->save();

	return $new_file;
	}

	return $file;
	}

	private static function buildFromFileData($data, array $params = array()) {
	$selector = PhabricatorEnv::newObjectFromConfig('storage.engine-selector');

	if (isset($params['storageEngines'])) {
	$engines = $params['storageEngines'];
	} else {
	$selector = PhabricatorEnv::newObjectFromConfig(
	'storage.engine-selector');
	$engines = $selector->selectStorageEngines($data, $params);
	}

	assert_instances_of($engines, 'PhabricatorFileStorageEngine');
	if (!$engines) {
	throw new Exception("No valid storage engines are available!");
	}

	$file = new PhabricatorFile();

	$data_handle = null;
	$engine_identifier = null;
	$exceptions = array();
	foreach ($engines as $engine) {
	$engine_class = get_class($engine);
	try {
	list($engine_identifier, $data_handle) = $file->writeToEngine(
	$engine,
	$data,
	$params);

	// We stored the file somewhere so stop trying to write it to other
	// places.
	break;
	} catch (PhabricatorFileStorageConfigurationException $ex) {
	// If an engine is outright misconfigured (or misimplemented), raise
	// that immediately since it probably needs attention.
	throw $ex;
	} catch (Exception $ex) {
	phlog($ex);

	// If an engine doesn't work, keep trying all the other valid engines
	// in case something else works.
	$exceptions[$engine_class] = $ex;
	}
	}

	if (!$data_handle) {
	throw new PhutilAggregateException(
	"All storage engines failed to write file:",
	$exceptions);
	}

	$file_name = idx($params, 'name');
	$file_name = self::normalizeFileName($file_name);
	$file_ttl = idx($params, 'ttl');

	// If for whatever reason, authorPHID isn't passed as a param
	// (always the case with newFromFileDownload()), store a ''
	$authorPHID = idx($params, 'authorPHID');

	$file->setName($file_name);
	$file->setByteSize(strlen($data));
	$file->setAuthorPHID($authorPHID);
	$file->setTtl($file_ttl);
	$file->setContentHash(self::hashFileContent($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);
	$file->setIsExplicitUpload(idx($params, 'isExplicitUpload') ? 1 : 0);

	if (isset($params['mime-type'])) {
	$file->setMimeType($params['mime-type']);
	} else {
	$tmp = new TempFile();
	Filesystem::writeFile($tmp, $data);
	$file->setMimeType(Filesystem::getMimeType($tmp));
	}

	try {
	$file->updateDimensions(false);
	} catch (Exception $ex) {
	// Do nothing
	}

	$file->save();

	return $file;
	}

	public static function newFromFileData($data, array $params = array()) {
	$hash = self::hashFileContent($data);
	$file = self::newFileFromContentHash($hash, $params);

	if ($file) {
	return $file;
	}

	return self::buildFromFileData($data, $params);
	}

	public function migrateToEngine(PhabricatorFileStorageEngine $engine) {
	if (!$this->getID() \|\| !$this->getStorageHandle()) {
	throw new Exception(
	"You can not migrate a file which hasn't yet been saved.");
	}

	$data = $this->loadFileData();
	$params = array(
	'name' => $this->getName(),
	);

	list($new_identifier, $new_handle) = $this->writeToEngine(
	$engine,
	$data,
	$params);

	$old_engine = $this->instantiateStorageEngine();
	$old_handle = $this->getStorageHandle();

	$this->setStorageEngine($new_identifier);
	$this->setStorageHandle($new_handle);
	$this->save();

	$old_engine->deleteFile($old_handle);

	return $this;
	}

	private function writeToEngine(
	PhabricatorFileStorageEngine $engine,
	$data,
	array $params) {

	$engine_class = get_class($engine);

	$data_handle = $engine->writeFile($data, $params);

	if (!$data_handle \|\| strlen($data_handle) > 255) {
	// This indicates an improperly implemented storage engine.
	throw new PhabricatorFileStorageConfigurationException(
	"Storage engine '{$engine_class}' executed writeFile() but did ".
	"not return a valid handle ('{$data_handle}') to the data: it ".
	"must be nonempty and no longer than 255 characters.");
	}

	$engine_identifier = $engine->getEngineIdentifier();
	if (!$engine_identifier \|\| strlen($engine_identifier) > 32) {
	throw new PhabricatorFileStorageConfigurationException(
	"Storage engine '{$engine_class}' returned an improper engine ".
	"identifier '{$engine_identifier}': it must be nonempty ".
	"and no longer than 32 characters.");
	}

	return array($engine_identifier, $data_handle);
	}


	public static function newFromFileDownload($uri, array $params = array()) {
	// Make sure we're allowed to make a request first
	if (!PhabricatorEnv::getEnvConfig('security.allow-outbound-http')) {
	throw new Exception("Outbound HTTP requests are disabled!");
	}

	$uri = new PhutilURI($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 = 5;

	list($file_data) = id(new HTTPSFuture($uri))
	->setTimeout($timeout)
	->resolvex();

	$params = $params + array(
	'name' => basename($uri),
	);

	return self::newFromFileData($file_data, $params);
	}

	public static function normalizeFileName($file_name) {
	$pattern = "@[\\x00-\\x19#%&+!~'\$\"\/=\\\\?<> ]+@";
	$file_name = preg_replace($pattern, '_', $file_name);
	$file_name = preg_replace('@_+@', '_', $file_name);
	$file_name = trim($file_name, '_');

	$disallowed_filenames = array(
	'.' => 'dot',
	'..' => 'dotdot',
	'' => 'file',
	);
	$file_name = idx($disallowed_filenames, $file_name, $file_name);

	return $file_name;
	}

	public function delete() {

	// We want to delete all the rows which mark this file as the transformation
	// of some other file (since we're getting rid of it). We also delete all
	// the transformations of this file, so that a user who deletes an image
	// doesn't need to separately hunt down and delete a bunch of thumbnails and
	// resizes of it.

	$outbound_xforms = id(new PhabricatorFileQuery())
	->setViewer(PhabricatorUser::getOmnipotentUser())
	->withTransforms(
	array(
	array(
	'originalPHID' => $this->getPHID(),
	'transform' => true,
	),
	))
	->execute();

	foreach ($outbound_xforms as $outbound_xform) {
	$outbound_xform->delete();
	}

	$inbound_xforms = id(new PhabricatorTransformedFile())->loadAllWhere(
	'transformedPHID = %s',
	$this->getPHID());

	$this->openTransaction();
	foreach ($inbound_xforms as $inbound_xform) {
	$inbound_xform->delete();
	}
	$ret = parent::delete();
	$this->saveTransaction();

	// Check to see if other files are using storage
	$other_file = id(new PhabricatorFile())->loadAllWhere(
	'storageEngine = %s AND storageHandle = %s AND
	storageFormat = %s AND id != %d LIMIT 1',
	$this->getStorageEngine(),
	$this->getStorageHandle(),
	$this->getStorageFormat(),
	$this->getID());

	// If this is the only file using the storage, delete storage
	if (!$other_file) {
	$engine = $this->instantiateStorageEngine();
	try {
	$engine->deleteFile($this->getStorageHandle());
	} catch (Exception $ex) {
	// In the worst case, we're leaving some data stranded in a storage
	// engine, which is fine.
	phlog($ex);
	}
	}

	return $ret;
	}

	public static function hashFileContent($data) {
	return sha1($data);
	}

	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 getDownloadURI() {
	$uri = id(new PhutilURI($this->getViewURI()))
	->setQueryParam('download', true);
	return (string) $uri;
	}

	public function getProfileThumbURI() {
	$path = '/file/xform/thumb-profile/'.$this->getPHID().'/'
	.$this->getSecretKey().'/';
	return PhabricatorEnv::getCDNURI($path);
	}

	public function getThumb60x45URI() {
	$path = '/file/xform/thumb-60x45/'.$this->getPHID().'/'
	.$this->getSecretKey().'/';
	return PhabricatorEnv::getCDNURI($path);
	}

	public function getThumb160x120URI() {
	$path = '/file/xform/thumb-160x120/'.$this->getPHID().'/'
	.$this->getSecretKey().'/';
	return PhabricatorEnv::getCDNURI($path);
	}

	public function getPreview140URI() {
	$path = '/file/xform/preview-140/'.$this->getPHID().'/'
	.$this->getSecretKey().'/';
	return PhabricatorEnv::getCDNURI($path);
	}

	public function getPreview220URI() {
	$path = '/file/xform/preview-220/'.$this->getPHID().'/'
	.$this->getSecretKey().'/';
	return PhabricatorEnv::getCDNURI($path);
	}

	public function getThumb220x165URI() {
	$path = '/file/xform/thumb-220x165/'.$this->getPHID().'/'
	.$this->getSecretKey().'/';
	return PhabricatorEnv::getCDNURI($path);
	}

	public function getThumb280x210URI() {
	$path = '/file/xform/thumb-280x210/'.$this->getPHID().'/'
	.$this->getSecretKey().'/';
	return PhabricatorEnv::getCDNURI($path);
	}

	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 isAudio() {
	if (!$this->isViewableInBrowser()) {
	return false;
	}

	$mime_map = PhabricatorEnv::getEnvConfig('files.audio-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() {
	return self::buildEngine($this->getStorageEngine());
	}

	public static function buildEngine($engine_identifier) {
	$engines = self::buildAllEngines();
	foreach ($engines as $engine) {
	if ($engine->getEngineIdentifier() == $engine_identifier) {
	return $engine;
	}
	}

	throw new Exception(
	"Storage engine '{$engine_identifier}' could not be located!");
	}

	public static function buildAllEngines() {
	$engines = id(new PhutilSymbolLoader())
	->setType('class')
	->setConcreteOnly(true)
	->setAncestorClass('PhabricatorFileStorageEngine')
	->selectAndLoadSymbols();

	$results = array();
	foreach ($engines as $engine_class) {
	$results[] = newv($engine_class['name'], array());
	}

	return $results;
	}

	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 getDisplayIconForMimeType() {
	$mime_map = PhabricatorEnv::getEnvConfig('files.icon-mime-types');
	$mime_type = $this->getMimeType();
	return idx($mime_map, $mime_type, 'docs_file');
	}

	public function validateSecretKey($key) {
	return ($key == $this->getSecretKey());
	}

	public function generateSecretKey() {
	return Filesystem::readRandomCharacters(20);
	}

	public function updateDimensions($save = true) {
	if (!$this->isViewableImage()) {
	throw new Exception(
	"This file is not a viewable image.");
	}

	if (!function_exists("imagecreatefromstring")) {
	throw new Exception(
	"Cannot retrieve image information.");
	}

	$data = $this->loadFileData();

	$img = imagecreatefromstring($data);
	if ($img === false) {
	throw new Exception(
	"Error when decoding image.");
	}

	$this->metadata[self::METADATA_IMAGE_WIDTH] = imagesx($img);
	$this->metadata[self::METADATA_IMAGE_HEIGHT] = imagesy($img);

	if ($save) {
	$this->save();
	}

	return $this;
	}

	public function copyDimensions(PhabricatorFile $file) {
	$metadata = $file->getMetadata();
	$width = idx($metadata, self::METADATA_IMAGE_WIDTH);
	if ($width) {
	$this->metadata[self::METADATA_IMAGE_WIDTH] = $width;
	}
	$height = idx($metadata, self::METADATA_IMAGE_HEIGHT);
	if ($height) {
	$this->metadata[self::METADATA_IMAGE_HEIGHT] = $height;
	}

	return $this;
	}


	/**
	* Load (or build) the {@class:PhabricatorFile} objects for builtin file
	* resources. The builtin mechanism allows files shipped with Phabricator
	* to be treated like normal files so that APIs do not need to special case
	* things like default images or deleted files.
	*
	* Builtins are located in `resources/builtin/` and identified by their
	* name.
	*
	* @param PhabricatorUser Viewing user.
	* @param list<string> List of builtin file names.
	* @return dict<string, PhabricatorFile> Dictionary of named builtins.
	*/
	public static function loadBuiltins(PhabricatorUser $user, array $names) {
	$specs = array();
	foreach ($names as $name) {
	$specs[] = array(
	'originalPHID' => PhabricatorPHIDConstants::PHID_VOID,
	'transform' => 'builtin:'.$name,
	);
	}

	// NOTE: Anyone is allowed to access builtin files.

	$files = id(new PhabricatorFileQuery())
	->setViewer(PhabricatorUser::getOmnipotentUser())
	->withTransforms($specs)
	->execute();

	$files = mpull($files, null, 'getName');

	$root = dirname(phutil_get_library_root('phabricator'));
	$root = $root.'/resources/builtin/';

	$build = array();
	foreach ($names as $name) {
	if (isset($files[$name])) {
	continue;
	}

	// This is just a sanity check to prevent loading arbitrary files.
	if (basename($name) != $name) {
	throw new Exception("Invalid builtin name '{$name}'!");
	}

	$path = $root.$name;

	if (!Filesystem::pathExists($path)) {
	throw new Exception("Builtin '{$path}' does not exist!");
	}

	$data = Filesystem::readFile($path);
	$params = array(
	'name' => $name,
	'ttl' => time() + (60 * 60 * 24 * 7),
	);

	$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
	$file = PhabricatorFile::newFromFileData($data, $params);
	$xform = id(new PhabricatorTransformedFile())
	->setOriginalPHID(PhabricatorPHIDConstants::PHID_VOID)
	->setTransform('builtin:'.$name)
	->setTransformedPHID($file->getPHID())
	->save();
	unset($unguarded);

	$file->attachObjectPHIDs(array());
	$file->attachObjects(array());

	$files[$name] = $file;
	}

	return $files;
	}


	/**
	* Convenience wrapper for @{method:loadBuiltins}.
	*
	* @param PhabricatorUser Viewing user.
	* @param string Single builtin name to load.
	* @return PhabricatorFile Corresponding builtin file.
	*/
	public static function loadBuiltin(PhabricatorUser $user, $name) {
	return idx(self::loadBuiltins($user, array($name)), $name);
	}

	public function getObjects() {
	return $this->assertAttached($this->objects);
	}

	public function attachObjects(array $objects) {
	$this->objects = $objects;
	return $this;
	}

	public function getObjectPHIDs() {
	return $this->assertAttached($this->objectPHIDs);
	}

	public function attachObjectPHIDs(array $object_phids) {
	$this->objectPHIDs = $object_phids;
	return $this;
	}

	public function getImageHeight() {
	if (!$this->isViewableImage()) {
	return null;
	}
	return idx($this->metadata, self::METADATA_IMAGE_HEIGHT);
	}

	public function getImageWidth() {
	if (!$this->isViewableImage()) {
	return null;
	}
	return idx($this->metadata, self::METADATA_IMAGE_WIDTH);
	}

	/**
	* Write the policy edge between this file and some object.
	*
	* @param PhabricatorUser Acting user.
	* @param phid Object PHID to attach to.
	* @return this
	*/
	public function attachToObject(PhabricatorUser $actor, $phid) {
	$edge_type = PhabricatorEdgeConfig::TYPE_OBJECT_HAS_FILE;

	id(new PhabricatorEdgeEditor())
	->setActor($actor)
	->setSuppressEvents(true)
	->addEdge($phid, $edge_type, $this->getPHID())
	->save();

	return $this;
	}


	/* -( PhabricatorPolicyInterface Implementation )-------------------------- */


	public function getCapabilities() {
	return array(
	PhabricatorPolicyCapability::CAN_VIEW,
	PhabricatorPolicyCapability::CAN_EDIT,
	);
	}

	public function getPolicy($capability) {
	// TODO: Implement proper per-object policies.
	return PhabricatorPolicies::POLICY_USER;
	}

	public function hasAutomaticCapability($capability, PhabricatorUser $viewer) {
	$viewer_phid = $viewer->getPHID();
	if ($viewer_phid) {
	if ($this->getAuthorPHID() == $viewer_phid) {
	return true;
	}
	}

	switch ($capability) {
	case PhabricatorPolicyCapability::CAN_VIEW:
	// If you can see any object this file is attached to, you can see
	// the file.
	return (count($this->getObjects()) > 0);
	}

	return false;
	}

	public function describeAutomaticCapability($capability) {
	$out = array();
	$out[] = pht('The user who uploaded a file can always view and edit it.');
	switch ($capability) {
	case PhabricatorPolicyCapability::CAN_VIEW:
	$out[] = pht(
	'Files attached to objects are visible to users who can view '.
	'those objects.');
	break;
	}

	return $out;
	}


	/* -( PhabricatorSubscribableInterface Implementation )-------------------- */


	public function isAutomaticallySubscribed($phid) {
	return ($this->authorPHID == $phid);
	}


	/* -( PhabricatorTokenReceiverInterface )---------------------------------- */


	public function getUsersToNotifyOfTokenGiven() {
	return array(
	$this->getAuthorPHID(),
	);
	}


	}

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