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	diff --git a/resources/sql/autopatches/20160711.files.01.builtin.sql b/resources/sql/autopatches/20160711.files.01.builtin.sql
	new file mode 100644
	index 0000000000..d8849ec053
	--- /dev/null
	+++ b/resources/sql/autopatches/20160711.files.01.builtin.sql
	@@ -0,0 +1,2 @@
	+ALTER TABLE {$NAMESPACE}_file.file
	+ ADD builtinKey VARCHAR(64) COLLATE {$COLLATE_TEXT};
	diff --git a/resources/sql/autopatches/20160711.files.02.builtinkey.sql b/resources/sql/autopatches/20160711.files.02.builtinkey.sql
	new file mode 100644
	index 0000000000..3551f6c3cd
	--- /dev/null
	+++ b/resources/sql/autopatches/20160711.files.02.builtinkey.sql
	@@ -0,0 +1,2 @@
	+ALTER TABLE {$NAMESPACE}_file.file
	+ ADD UNIQUE KEY `key_builtin` (builtinKey);
	diff --git a/src/applications/files/query/PhabricatorFileQuery.php b/src/applications/files/query/PhabricatorFileQuery.php
	index 5e1876acd6..c2ac083fea 100644
	--- a/src/applications/files/query/PhabricatorFileQuery.php
	+++ b/src/applications/files/query/PhabricatorFileQuery.php
	@@ -1,398 +1,411 @@
	<?php

	final class PhabricatorFileQuery
	extends PhabricatorCursorPagedPolicyAwareQuery {

	private $ids;
	private $phids;
	private $authorPHIDs;
	private $explicitUploads;
	private $transforms;
	private $dateCreatedAfter;
	private $dateCreatedBefore;
	private $contentHashes;
	private $minLength;
	private $maxLength;
	private $names;
	private $isPartial;
	private $needTransforms;
	+ private $builtinKeys;

	public function withIDs(array $ids) {
	$this->ids = $ids;
	return $this;
	}

	public function withPHIDs(array $phids) {
	$this->phids = $phids;
	return $this;
	}

	public function withAuthorPHIDs(array $phids) {
	$this->authorPHIDs = $phids;
	return $this;
	}

	public function withDateCreatedBefore($date_created_before) {
	$this->dateCreatedBefore = $date_created_before;
	return $this;
	}

	public function withDateCreatedAfter($date_created_after) {
	$this->dateCreatedAfter = $date_created_after;
	return $this;
	}

	public function withContentHashes(array $content_hashes) {
	$this->contentHashes = $content_hashes;
	return $this;
	}

	+ public function withBuiltinKeys(array $keys) {
	+ $this->builtinKeys = $keys;
	+ return $this;
	+ }
	+
	/**
	* Select files which are transformations of some other file. For example,
	* you can use this query to find previously generated thumbnails of an image
	* file.
	*
	* As a parameter, provide a list of transformation specifications. Each
	* specification is a dictionary with the keys `originalPHID` and `transform`.
	* The `originalPHID` is the PHID of the original file (the file which was
	* transformed) and the `transform` is the name of the transform to query
	* for. If you pass `true` as the `transform`, all transformations of the
	* file will be selected.
	*
	* For example:
	*
	* array(
	* array(
	* 'originalPHID' => 'PHID-FILE-aaaa',
	* 'transform' => 'sepia',
	* ),
	* array(
	* 'originalPHID' => 'PHID-FILE-bbbb',
	* 'transform' => true,
	* ),
	* )
	*
	* This selects the `"sepia"` transformation of the file with PHID
	* `PHID-FILE-aaaa` and all transformations of the file with PHID
	* `PHID-FILE-bbbb`.
	*
	* @param list<dict> List of transform specifications, described above.
	* @return this
	*/
	public function withTransforms(array $specs) {
	foreach ($specs as $spec) {
	if (!is_array($spec) \|\|
	empty($spec['originalPHID']) \|\|
	empty($spec['transform'])) {
	throw new Exception(
	pht(
	"Transform specification must be a dictionary with keys ".
	"'%s' and '%s'!",
	'originalPHID',
	'transform'));
	}
	}

	$this->transforms = $specs;
	return $this;
	}

	public function withLengthBetween($min, $max) {
	$this->minLength = $min;
	$this->maxLength = $max;
	return $this;
	}

	public function withNames(array $names) {
	$this->names = $names;
	return $this;
	}

	public function withIsPartial($partial) {
	$this->isPartial = $partial;
	return $this;
	}

	public function showOnlyExplicitUploads($explicit_uploads) {
	$this->explicitUploads = $explicit_uploads;
	return $this;
	}

	public function needTransforms(array $transforms) {
	$this->needTransforms = $transforms;
	return $this;
	}

	public function newResultObject() {
	return new PhabricatorFile();
	}

	protected function loadPage() {
	$files = $this->loadStandardPage(new PhabricatorFile());

	if (!$files) {
	return $files;
	}

	$viewer = $this->getViewer();
	$is_omnipotent = $viewer->isOmnipotent();

	// We need to load attached objects to perform policy checks for files.
	// First, load the edges.

	$edge_type = PhabricatorFileHasObjectEdgeType::EDGECONST;
	$file_phids = mpull($files, 'getPHID');
	$edges = id(new PhabricatorEdgeQuery())
	->withSourcePHIDs($file_phids)
	->withEdgeTypes(array($edge_type))
	->execute();

	$object_phids = array();
	foreach ($files as $file) {
	$phids = array_keys($edges[$file->getPHID()][$edge_type]);
	$file->attachObjectPHIDs($phids);

	if ($file->getIsProfileImage()) {
	// If this is a profile image, don't bother loading related files.
	// It will always be visible, and we can get into trouble if we try
	// to load objects and end up stuck in a cycle. See T8478.
	continue;
	}

	if ($is_omnipotent) {
	// If the viewer is omnipotent, we don't need to load the associated
	// objects either since they can certainly see the object. Skipping
	// this can improve performance and prevent cycles.
	continue;
	}

	foreach ($phids as $phid) {
	$object_phids[$phid] = true;
	}
	}

	// If this file is a transform of another file, load that file too. If you
	// can see the original file, you can see the thumbnail.

	// TODO: It might be nice to put this directly on PhabricatorFile and remove
	// the PhabricatorTransformedFile table, which would be a little simpler.

	$xforms = id(new PhabricatorTransformedFile())->loadAllWhere(
	'transformedPHID IN (%Ls)',
	$file_phids);
	$xform_phids = mpull($xforms, 'getOriginalPHID', 'getTransformedPHID');
	foreach ($xform_phids as $derived_phid => $original_phid) {
	$object_phids[$original_phid] = true;
	}

	$object_phids = array_keys($object_phids);

	// Now, load the objects.

	$objects = array();
	if ($object_phids) {
	// NOTE: We're explicitly turning policy exceptions off, since the rule
	// here is "you can see the file if you can see ANY associated object".
	// Without this explicit flag, we'll incorrectly throw unless you can
	// see ALL associated objects.

	$objects = id(new PhabricatorObjectQuery())
	->setParentQuery($this)
	->setViewer($this->getViewer())
	->withPHIDs($object_phids)
	->setRaisePolicyExceptions(false)
	->execute();
	$objects = mpull($objects, null, 'getPHID');
	}

	foreach ($files as $file) {
	$file_objects = array_select_keys($objects, $file->getObjectPHIDs());
	$file->attachObjects($file_objects);
	}

	foreach ($files as $key => $file) {
	$original_phid = idx($xform_phids, $file->getPHID());
	if ($original_phid == PhabricatorPHIDConstants::PHID_VOID) {
	// This is a special case for builtin files, which are handled
	// oddly.
	$original = null;
	} else if ($original_phid) {
	$original = idx($objects, $original_phid);
	if (!$original) {
	// If the viewer can't see the original file, also prevent them from
	// seeing the transformed file.
	$this->didRejectResult($file);
	unset($files[$key]);
	continue;
	}
	} else {
	$original = null;
	}
	$file->attachOriginalFile($original);
	}

	return $files;
	}

	protected function didFilterPage(array $files) {
	$xform_keys = $this->needTransforms;
	if ($xform_keys !== null) {
	$xforms = id(new PhabricatorTransformedFile())->loadAllWhere(
	'originalPHID IN (%Ls) AND transform IN (%Ls)',
	mpull($files, 'getPHID'),
	$xform_keys);

	if ($xforms) {
	$xfiles = id(new PhabricatorFile())->loadAllWhere(
	'phid IN (%Ls)',
	mpull($xforms, 'getTransformedPHID'));
	$xfiles = mpull($xfiles, null, 'getPHID');
	}

	$xform_map = array();
	foreach ($xforms as $xform) {
	$xfile = idx($xfiles, $xform->getTransformedPHID());
	if (!$xfile) {
	continue;
	}
	$original_phid = $xform->getOriginalPHID();
	$xform_key = $xform->getTransform();
	$xform_map[$original_phid][$xform_key] = $xfile;
	}

	$default_xforms = array_fill_keys($xform_keys, null);

	foreach ($files as $file) {
	$file_xforms = idx($xform_map, $file->getPHID(), array());
	$file_xforms += $default_xforms;
	$file->attachTransforms($file_xforms);
	}
	}

	return $files;
	}

	protected function buildJoinClauseParts(AphrontDatabaseConnection $conn) {
	$joins = parent::buildJoinClauseParts($conn);

	if ($this->transforms) {
	$joins[] = qsprintf(
	$conn,
	'JOIN %T t ON t.transformedPHID = f.phid',
	id(new PhabricatorTransformedFile())->getTableName());
	}

	return $joins;
	}

	protected function buildWhereClauseParts(AphrontDatabaseConnection $conn) {
	$where = parent::buildWhereClauseParts($conn);

	if ($this->ids !== null) {
	$where[] = qsprintf(
	$conn,
	'f.id IN (%Ld)',
	$this->ids);
	}

	if ($this->phids !== null) {
	$where[] = qsprintf(
	$conn,
	'f.phid IN (%Ls)',
	$this->phids);
	}

	if ($this->authorPHIDs !== null) {
	$where[] = qsprintf(
	$conn,
	'f.authorPHID IN (%Ls)',
	$this->authorPHIDs);
	}

	if ($this->explicitUploads !== null) {
	$where[] = qsprintf(
	$conn,
	'f.isExplicitUpload = %d',
	(int)$this->explicitUploads);
	}

	if ($this->transforms !== null) {
	$clauses = array();
	foreach ($this->transforms as $transform) {
	if ($transform['transform'] === true) {
	$clauses[] = qsprintf(
	$conn,
	'(t.originalPHID = %s)',
	$transform['originalPHID']);
	} else {
	$clauses[] = qsprintf(
	$conn,
	'(t.originalPHID = %s AND t.transform = %s)',
	$transform['originalPHID'],
	$transform['transform']);
	}
	}
	$where[] = qsprintf($conn, '(%Q)', implode(') OR (', $clauses));
	}

	if ($this->dateCreatedAfter !== null) {
	$where[] = qsprintf(
	$conn,
	'f.dateCreated >= %d',
	$this->dateCreatedAfter);
	}

	if ($this->dateCreatedBefore !== null) {
	$where[] = qsprintf(
	$conn,
	'f.dateCreated <= %d',
	$this->dateCreatedBefore);
	}

	if ($this->contentHashes !== null) {
	$where[] = qsprintf(
	$conn,
	'f.contentHash IN (%Ls)',
	$this->contentHashes);
	}

	if ($this->minLength !== null) {
	$where[] = qsprintf(
	$conn,
	'byteSize >= %d',
	$this->minLength);
	}

	if ($this->maxLength !== null) {
	$where[] = qsprintf(
	$conn,
	'byteSize <= %d',
	$this->maxLength);
	}

	if ($this->names !== null) {
	$where[] = qsprintf(
	$conn,
	'name in (%Ls)',
	$this->names);
	}

	if ($this->isPartial !== null) {
	$where[] = qsprintf(
	$conn,
	'isPartial = %d',
	(int)$this->isPartial);
	}

	+ if ($this->builtinKeys !== null) {
	+ $where[] = qsprintf(
	+ $conn,
	+ 'builtinKey IN (%Ls)',
	+ $this->builtinKeys);
	+ }
	+
	return $where;
	}

	protected function getPrimaryTableAlias() {
	return 'f';
	}

	public function getQueryApplicationClass() {
	return 'PhabricatorFilesApplication';
	}

	}
	diff --git a/src/applications/files/storage/PhabricatorFile.php b/src/applications/files/storage/PhabricatorFile.php
	index 7e8f4b18fc..8d81c3ae98 100644
	--- a/src/applications/files/storage/PhabricatorFile.php
	+++ b/src/applications/files/storage/PhabricatorFile.php
	@@ -1,1455 +1,1463 @@
	<?php

	/**
	* Parameters
	* ==========
	*
	* When creating a new file using a method like @{method:newFromFileData}, these
	* parameters are supported:
	*
	* \| name \| Human readable filename.
	* \| authorPHID \| User PHID of uploader.
	* \| ttl \| Temporary file lifetime, in seconds.
	* \| viewPolicy \| File visibility policy.
	* \| isExplicitUpload \| Used to show users files they explicitly uploaded.
	* \| canCDN \| Allows the file to be cached and delivered over a CDN.
	* \| mime-type \| Optional, explicit file MIME type.
	* \| builtin \| Optional filename, identifies this as a builtin.
	*
	*/
	final class PhabricatorFile extends PhabricatorFileDAO
	implements
	PhabricatorApplicationTransactionInterface,
	PhabricatorTokenReceiverInterface,
	PhabricatorSubscribableInterface,
	PhabricatorFlaggableInterface,
	PhabricatorPolicyInterface,
	PhabricatorDestructibleInterface {

	const METADATA_IMAGE_WIDTH = 'width';
	const METADATA_IMAGE_HEIGHT = 'height';
	const METADATA_CAN_CDN = 'canCDN';
	const METADATA_BUILTIN = 'builtin';
	const METADATA_PARTIAL = 'partial';
	const METADATA_PROFILE = 'profile';
	const METADATA_STORAGE = 'storage';

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

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

	protected $ttl;
	protected $isExplicitUpload = 1;
	protected $viewPolicy = PhabricatorPolicies::POLICY_USER;
	protected $isPartial = 0;

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

	public static function initializeNewFile() {
	$app = id(new PhabricatorApplicationQuery())
	->setViewer(PhabricatorUser::getOmnipotentUser())
	->withClasses(array('PhabricatorFilesApplication'))
	->executeOne();

	$view_policy = $app->getPolicy(
	FilesDefaultViewCapability::CAPABILITY);

	return id(new PhabricatorFile())
	->setViewPolicy($view_policy)
	->setIsPartial(0)
	->attachOriginalFile(null)
	->attachObjects(array())
	->attachObjectPHIDs(array());
	}

	protected function getConfiguration() {
	return array(
	self::CONFIG_AUX_PHID => true,
	self::CONFIG_SERIALIZATION => array(
	'metadata' => self::SERIALIZATION_JSON,
	),
	self::CONFIG_COLUMN_SCHEMA => array(
	'name' => 'text255?',
	'mimeType' => 'text255?',
	'byteSize' => 'uint64',
	'storageEngine' => 'text32',
	'storageFormat' => 'text32',
	'storageHandle' => 'text255',
	'authorPHID' => 'phid?',
	'secretKey' => 'bytes20?',
	'contentHash' => 'bytes40?',
	'ttl' => 'epoch?',
	'isExplicitUpload' => 'bool?',
	'mailKey' => 'bytes20',
	'isPartial' => 'bool',
	+ 'builtinKey' => 'text64?',
	),
	self::CONFIG_KEY_SCHEMA => array(
	'key_phid' => null,
	'phid' => array(
	'columns' => array('phid'),
	'unique' => true,
	),
	'authorPHID' => array(
	'columns' => array('authorPHID'),
	),
	'contentHash' => array(
	'columns' => array('contentHash'),
	),
	'key_ttl' => array(
	'columns' => array('ttl'),
	),
	'key_dateCreated' => array(
	'columns' => array('dateCreated'),
	),
	'key_partial' => array(
	'columns' => array('authorPHID', 'isPartial'),
	),
	+ 'key_builtin' => array(
	+ 'columns' => array('builtinKey'),
	+ 'unique' => true,
	+ ),
	),
	) + parent::getConfiguration();
	}

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

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

	public function getMonogram() {
	return 'F'.$this->getID();
	}

	public function scrambleSecret() {
	return $this->setSecretKey($this->generateSecretKey());
	}

	public static function readUploadedFileData($spec) {
	if (!$spec) {
	throw new Exception(pht('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(pht('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(pht('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 newFromXHRUpload($data, array $params = array()) {
	return self::newFromFileData($data, $params);
	}


	/**
	* 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()) {

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

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

	return $file;
	}

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

	if ($file) {
	$copy_of_storage_engine = $file->getStorageEngine();
	$copy_of_storage_handle = $file->getStorageHandle();
	$copy_of_storage_format = $file->getStorageFormat();
	$copy_of_storage_properties = $file->getStorageProperties();
	$copy_of_byte_size = $file->getByteSize();
	$copy_of_mime_type = $file->getMimeType();

	$new_file = self::initializeNewFile();

	$new_file->setByteSize($copy_of_byte_size);

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

	$new_file->readPropertiesFromParameters($params);

	$new_file->save();

	return $new_file;
	}

	return $file;
	}

	public static function newChunkedFile(
	PhabricatorFileStorageEngine $engine,
	$length,
	array $params) {

	$file = self::initializeNewFile();

	$file->setByteSize($length);

	// NOTE: Once we receive the first chunk, we'll detect its MIME type and
	// update the parent file. This matters for large media files like video.
	$file->setMimeType('application/octet-stream');

	$chunked_hash = idx($params, 'chunkedHash');
	if ($chunked_hash) {
	$file->setContentHash($chunked_hash);
	} else {
	// See PhabricatorChunkedFileStorageEngine::getChunkedHash() for some
	// discussion of this.
	$seed = Filesystem::readRandomBytes(64);
	$hash = PhabricatorChunkedFileStorageEngine::getChunkedHashForInput(
	$seed);
	$file->setContentHash($hash);
	}

	$file->setStorageEngine($engine->getEngineIdentifier());
	$file->setStorageHandle(PhabricatorFileChunk::newChunkHandle());

	// Chunked files are always stored raw because they do not actually store
	// data. The chunks do, and can be individually formatted.
	$file->setStorageFormat(PhabricatorFileRawStorageFormat::FORMATKEY);

	$file->setIsPartial(1);

	$file->readPropertiesFromParameters($params);

	return $file;
	}

	private static function buildFromFileData($data, array $params = array()) {

	if (isset($params['storageEngines'])) {
	$engines = $params['storageEngines'];
	} else {
	$size = strlen($data);
	$engines = PhabricatorFileStorageEngine::loadStorageEngines($size);

	if (!$engines) {
	throw new Exception(
	pht(
	'No configured storage engine can store this file. See '.
	'"Configuring File Storage" in the documentation for '.
	'information on configuring storage engines.'));
	}
	}

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

	$file = self::initializeNewFile();

	$aes_type = PhabricatorFileAES256StorageFormat::FORMATKEY;
	$has_aes = PhabricatorKeyring::getDefaultKeyName($aes_type);
	if ($has_aes !== null) {
	$default_key = PhabricatorFileAES256StorageFormat::FORMATKEY;
	} else {
	$default_key = PhabricatorFileRawStorageFormat::FORMATKEY;
	}
	$key = idx($params, 'format', $default_key);

	// Callers can pass in an object explicitly instead of a key. This is
	// primarily useful for unit tests.
	if ($key instanceof PhabricatorFileStorageFormat) {
	$format = clone $key;
	} else {
	$format = clone PhabricatorFileStorageFormat::requireFormat($key);
	}

	$format->setFile($file);

	$properties = $format->newStorageProperties();
	$file->setStorageFormat($format->getStorageFormatKey());
	$file->setStorageProperties($properties);

	$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(
	pht('All storage engines failed to write file:'),
	$exceptions);
	}

	$file->setByteSize(strlen($data));
	$file->setContentHash(self::hashFileContent($data));

	$file->setStorageEngine($engine_identifier);
	$file->setStorageHandle($data_handle);

	$file->readPropertiesFromParameters($params);

	if (!$file->getMimeType()) {
	$tmp = new TempFile();
	Filesystem::writeFile($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(
	pht("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_identifier = $this->getStorageEngine();
	$old_handle = $this->getStorageHandle();

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

	$this->deleteFileDataIfUnused(
	$old_engine,
	$old_identifier,
	$old_handle);

	return $this;
	}

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

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

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

	$properties = $format->newStorageProperties();
	$this->setStorageFormat($format->getStorageFormatKey());
	$this->setStorageProperties($properties);

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

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

	$this->deleteFileDataIfUnused(
	$engine,
	$identifier,
	$old_handle);

	return $this;
	}

	public function cycleMasterStorageKey(PhabricatorFileStorageFormat $format) {
	if (!$this->getID() \|\| !$this->getStorageHandle()) {
	throw new Exception(
	pht("You can not cycle keys for a file which hasn't yet been saved."));
	}

	$properties = $format->cycleStorageProperties();
	$this->setStorageProperties($properties);
	$this->save();

	return $this;
	}

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

	$engine_class = get_class($engine);

	$key = $this->getStorageFormat();
	$format = id(clone PhabricatorFileStorageFormat::requireFormat($key))
	->setFile($this);

	$data_iterator = array($data);
	$formatted_iterator = $format->newWriteIterator($data_iterator);
	$formatted_data = $this->loadDataFromIterator($formatted_iterator);

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

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

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

	return array($engine_identifier, $data_handle);
	}


	/**
	* Download a remote resource over HTTP and save the response body as a file.
	*
	* This method respects `security.outbound-blacklist`, and protects against
	* HTTP redirection (by manually following "Location" headers and verifying
	* each destination). It does not protect against DNS rebinding. See
	* discussion in T6755.
	*/
	public static function newFromFileDownload($uri, array $params = array()) {
	$timeout = 5;

	$redirects = array();
	$current = $uri;
	while (true) {
	try {
	if (count($redirects) > 10) {
	throw new Exception(
	pht('Too many redirects trying to fetch remote URI.'));
	}

	$resolved = PhabricatorEnv::requireValidRemoteURIForFetch(
	$current,
	array(
	'http',
	'https',
	));

	list($resolved_uri, $resolved_domain) = $resolved;

	$current = new PhutilURI($current);
	if ($current->getProtocol() == 'http') {
	// For HTTP, we can use a pre-resolved URI to defuse DNS rebinding.
	$fetch_uri = $resolved_uri;
	$fetch_host = $resolved_domain;
	} else {
	// For HTTPS, we can't: cURL won't verify the SSL certificate if
	// the domain has been replaced with an IP. But internal services
	// presumably will not have valid certificates for rebindable
	// domain names on attacker-controlled domains, so the DNS rebinding
	// attack should generally not be possible anyway.
	$fetch_uri = $current;
	$fetch_host = null;
	}

	$future = id(new HTTPSFuture($fetch_uri))
	->setFollowLocation(false)
	->setTimeout($timeout);

	if ($fetch_host !== null) {
	$future->addHeader('Host', $fetch_host);
	}

	list($status, $body, $headers) = $future->resolve();

	if ($status->isRedirect()) {
	// This is an HTTP 3XX status, so look for a "Location" header.
	$location = null;
	foreach ($headers as $header) {
	list($name, $value) = $header;
	if (phutil_utf8_strtolower($name) == 'location') {
	$location = $value;
	break;
	}
	}

	// HTTP 3XX status with no "Location" header, just treat this like
	// a normal HTTP error.
	if ($location === null) {
	throw $status;
	}

	if (isset($redirects[$location])) {
	throw new Exception(
	pht('Encountered loop while following redirects.'));
	}

	$redirects[$location] = $location;
	$current = $location;
	// We'll fall off the bottom and go try this URI now.
	} else if ($status->isError()) {
	// This is something other than an HTTP 2XX or HTTP 3XX status, so
	// just bail out.
	throw $status;
	} else {
	// This is HTTP 2XX, so use the response body to save the
	// file data.
	$params = $params + array(
	'name' => basename($uri),
	);

	return self::newFromFileData($body, $params);
	}
	} catch (Exception $ex) {
	if ($redirects) {
	throw new PhutilProxyException(
	pht(
	'Failed to fetch remote URI "%s" after following %s redirect(s) '.
	'(%s): %s',
	$uri,
	phutil_count($redirects),
	implode(' > ', array_keys($redirects)),
	$ex->getMessage()),
	$ex);
	} else {
	throw $ex;
	}
	}
	}
	}

	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();

	$this->deleteFileDataIfUnused(
	$this->instantiateStorageEngine(),
	$this->getStorageEngine(),
	$this->getStorageHandle());

	return $ret;
	}


	/**
	* Destroy stored file data if there are no remaining files which reference
	* it.
	*/
	public function deleteFileDataIfUnused(
	PhabricatorFileStorageEngine $engine,
	$engine_identifier,
	$handle) {

	// Check to see if any files are using storage.
	$usage = id(new PhabricatorFile())->loadAllWhere(
	'storageEngine = %s AND storageHandle = %s LIMIT 1',
	$engine_identifier,
	$handle);

	// If there are no files using the storage, destroy the actual storage.
	if (!$usage) {
	try {
	$engine->deleteFile($handle);
	} catch (Exception $ex) {
	// In the worst case, we're leaving some data stranded in a storage
	// engine, which is not a big deal.
	phlog($ex);
	}
	}
	}


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

	public function loadFileData() {
	$iterator = $this->getFileDataIterator();
	return $this->loadDataFromIterator($iterator);
	}


	/**
	* Return an iterable which emits file content bytes.
	*
	* @param int Offset for the start of data.
	* @param int Offset for the end of data.
	* @return Iterable Iterable object which emits requested data.
	*/
	public function getFileDataIterator($begin = null, $end = null) {
	$engine = $this->instantiateStorageEngine();
	$raw_iterator = $engine->getRawFileDataIterator($this, $begin, $end);

	$key = $this->getStorageFormat();

	$format = id(clone PhabricatorFileStorageFormat::requireFormat($key))
	->setFile($this);

	return $format->newReadIterator($raw_iterator);
	}


	public function getViewURI() {
	if (!$this->getPHID()) {
	throw new Exception(
	pht('You must save a file before you can generate a view URI.'));
	}

	return $this->getCDNURI();
	}

	public function getCDNURI() {
	$name = self::normalizeFileName($this->getName());
	$name = phutil_escape_uri($name);

	$parts = array();
	$parts[] = 'file';
	$parts[] = 'data';

	// If this is an instanced install, add the instance identifier to the URI.
	// Instanced configurations behind a CDN may not be able to control the
	// request domain used by the CDN (as with AWS CloudFront). Embedding the
	// instance identity in the path allows us to distinguish between requests
	// originating from different instances but served through the same CDN.
	$instance = PhabricatorEnv::getEnvConfig('cluster.instance');
	if (strlen($instance)) {
	$parts[] = '@'.$instance;
	}

	$parts[] = $this->getSecretKey();
	$parts[] = $this->getPHID();
	$parts[] = $name;

	$path = '/'.implode('/', $parts);

	// If this file is only partially uploaded, we're just going to return a
	// local URI to make sure that Ajax works, since the page is inevitably
	// going to give us an error back.
	if ($this->getIsPartial()) {
	return PhabricatorEnv::getURI($path);
	} else {
	return PhabricatorEnv::getCDNURI($path);
	}
	}


	public function getInfoURI() {
	return '/'.$this->getMonogram();
	}

	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 getURIForTransform(PhabricatorFileTransform $transform) {
	return $this->getTransformedURI($transform->getTransformKey());
	}

	private function getTransformedURI($transform) {
	$parts = array();
	$parts[] = 'file';
	$parts[] = 'xform';

	$instance = PhabricatorEnv::getEnvConfig('cluster.instance');
	if (strlen($instance)) {
	$parts[] = '@'.$instance;
	}

	$parts[] = $transform;
	$parts[] = $this->getPHID();
	$parts[] = $this->getSecretKey();

	$path = implode('/', $parts);
	$path = $path.'/';

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

	$mime_map = PhabricatorEnv::getEnvConfig('files.video-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(pht('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;
	}

	public function getDragAndDropDictionary() {
	return array(
	'id' => $this->getID(),
	'phid' => $this->getPHID(),
	'uri' => $this->getBestURI(),
	);
	}

	public 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(
	pht(
	"Storage engine '%s' could not be located!",
	$engine_identifier));
	}

	public static function buildAllEngines() {
	return id(new PhutilClassMapQuery())
	->setAncestorClass('PhabricatorFileStorageEngine')
	->execute();
	}

	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, 'fa-file-o');
	}

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

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

	public function setStorageProperties(array $properties) {
	$this->metadata[self::METADATA_STORAGE] = $properties;
	return $this;
	}

	public function getStorageProperties() {
	return idx($this->metadata, self::METADATA_STORAGE, array());
	}

	public function getStorageProperty($key, $default = null) {
	$properties = $this->getStorageProperties();
	return idx($properties, $key, $default);
	}

	public function loadDataFromIterator($iterator) {
	$result = '';

	foreach ($iterator as $chunk) {
	$result .= $chunk;
	}

	return $result;
	}

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

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

	$data = $this->loadFileData();

	$img = imagecreatefromstring($data);
	if ($img === false) {
	throw new Exception(pht('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<PhabricatorFilesBuiltinFile> List of builtin file specs.
	* @return dict<string, PhabricatorFile> Dictionary of named builtins.
	*/
	public static function loadBuiltins(PhabricatorUser $user, array $builtins) {
	$builtins = mpull($builtins, null, 'getBuiltinFileKey');

	- $specs = array();
	- foreach ($builtins as $key => $buitin) {
	- $specs[] = array(
	- 'originalPHID' => PhabricatorPHIDConstants::PHID_VOID,
	- 'transform' => $key,
	- );
	- }
	-
	// NOTE: Anyone is allowed to access builtin files.

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

	$results = array();
	foreach ($files as $file) {
	$builtin_key = $file->getBuiltinName();
	if ($builtin_key !== null) {
	$results[$builtin_key] = $file;
	}
	}

	$build = array();
	foreach ($builtins as $key => $builtin) {
	if (isset($results[$key])) {
	continue;
	}

	$data = $builtin->loadBuiltinFileData();

	$params = array(
	'name' => $builtin->getBuiltinDisplayName(),
	'ttl' => time() + (60 * 60 * 24 * 7),
	'canCDN' => true,
	'builtin' => $key,
	);

	$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
	- $file = self::newFromFileData($data, $params);
	- $xform = id(new PhabricatorTransformedFile())
	- ->setOriginalPHID(PhabricatorPHIDConstants::PHID_VOID)
	- ->setTransform($key)
	- ->setTransformedPHID($file->getPHID())
	- ->save();
	+ try {
	+ $file = self::newFromFileData($data, $params);
	+ } catch (AphrontDuplicateKeyQueryException $ex) {
	+ $file = id(new PhabricatorFileQuery())
	+ ->setViewer(PhabricatorUser::getOmnipotentUser())
	+ ->withBuiltinKeys(array($key))
	+ ->executeOne();
	+ if (!$file) {
	+ throw new Exception(
	+ pht(
	+ 'Collided mid-air when generating builtin file "%s", but '.
	+ 'then failed to load the object we collided with.',
	+ $key));
	+ }
	+ }
	unset($unguarded);

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

	$results[$key] = $file;
	}

	return $results;
	}


	/**
	* 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) {
	$builtin = id(new PhabricatorFilesOnDiskBuiltinFile())
	->setName($name);

	$key = $builtin->getBuiltinFileKey();

	return idx(self::loadBuiltins($user, array($builtin)), $key);
	}

	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 getOriginalFile() {
	return $this->assertAttached($this->originalFile);
	}

	public function attachOriginalFile(PhabricatorFile $file = null) {
	$this->originalFile = $file;
	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);
	}

	public function getCanCDN() {
	if (!$this->isViewableImage()) {
	return false;
	}

	return idx($this->metadata, self::METADATA_CAN_CDN);
	}

	public function setCanCDN($can_cdn) {
	$this->metadata[self::METADATA_CAN_CDN] = $can_cdn ? 1 : 0;
	return $this;
	}

	public function isBuiltin() {
	return ($this->getBuiltinName() !== null);
	}

	public function getBuiltinName() {
	return idx($this->metadata, self::METADATA_BUILTIN);
	}

	public function setBuiltinName($name) {
	$this->metadata[self::METADATA_BUILTIN] = $name;
	return $this;
	}

	public function getIsProfileImage() {
	return idx($this->metadata, self::METADATA_PROFILE);
	}

	public function setIsProfileImage($value) {
	$this->metadata[self::METADATA_PROFILE] = $value;
	return $this;
	}

	/**
	* Write the policy edge between this file and some object.
	*
	* @param phid Object PHID to attach to.
	* @return this
	*/
	public function attachToObject($phid) {
	$edge_type = PhabricatorObjectHasFileEdgeType::EDGECONST;

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

	return $this;
	}


	/**
	* Remove the policy edge between this file and some object.
	*
	* @param phid Object PHID to detach from.
	* @return this
	*/
	public function detachFromObject($phid) {
	$edge_type = PhabricatorObjectHasFileEdgeType::EDGECONST;

	id(new PhabricatorEdgeEditor())
	->removeEdge($phid, $edge_type, $this->getPHID())
	->save();

	return $this;
	}


	/**
	* Configure a newly created file object according to specified parameters.
	*
	* This method is called both when creating a file from fresh data, and
	* when creating a new file which reuses existing storage.
	*
	* @param map<string, wild> Bag of parameters, see @{class:PhabricatorFile}
	* for documentation.
	* @return this
	*/
	private function readPropertiesFromParameters(array $params) {
	$file_name = idx($params, 'name');
	$this->setName($file_name);

	$author_phid = idx($params, 'authorPHID');
	$this->setAuthorPHID($author_phid);

	$file_ttl = idx($params, 'ttl');
	$this->setTtl($file_ttl);

	$view_policy = idx($params, 'viewPolicy');
	if ($view_policy) {
	$this->setViewPolicy($params['viewPolicy']);
	}

	$is_explicit = (idx($params, 'isExplicitUpload') ? 1 : 0);
	$this->setIsExplicitUpload($is_explicit);

	$can_cdn = idx($params, 'canCDN');
	if ($can_cdn) {
	$this->setCanCDN(true);
	}

	$builtin = idx($params, 'builtin');
	if ($builtin) {
	$this->setBuiltinName($builtin);
	+ $this->setBuiltinKey($builtin);
	}

	$profile = idx($params, 'profile');
	if ($profile) {
	$this->setIsProfileImage(true);
	}

	$mime_type = idx($params, 'mime-type');
	if ($mime_type) {
	$this->setMimeType($mime_type);
	}

	return $this;
	}

	public function getRedirectResponse() {
	$uri = $this->getBestURI();

	// TODO: This is a bit iffy. Sometimes, getBestURI() returns a CDN URI
	// (if the file is a viewable image) and sometimes a local URI (if not).
	// For now, just detect which one we got and configure the response
	// appropriately. In the long run, if this endpoint is served from a CDN
	// domain, we can't issue a local redirect to an info URI (which is not
	// present on the CDN domain). We probably never actually issue local
	// redirects here anyway, since we only ever transform viewable images
	// right now.

	$is_external = strlen(id(new PhutilURI($uri))->getDomain());

	return id(new AphrontRedirectResponse())
	->setIsExternal($is_external)
	->setURI($uri);
	}

	public function attachTransforms(array $map) {
	$this->transforms = $map;
	return $this;
	}

	public function getTransform($key) {
	return $this->assertAttachedKey($this->transforms, $key);
	}


	/* -( PhabricatorApplicationTransactionInterface )------------------------- */


	public function getApplicationTransactionEditor() {
	return new PhabricatorFileEditor();
	}

	public function getApplicationTransactionObject() {
	return $this;
	}

	public function getApplicationTransactionTemplate() {
	return new PhabricatorFileTransaction();
	}

	public function willRenderTimeline(
	PhabricatorApplicationTransactionView $timeline,
	AphrontRequest $request) {

	return $timeline;
	}


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


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

	public function getPolicy($capability) {
	switch ($capability) {
	case PhabricatorPolicyCapability::CAN_VIEW:
	if ($this->isBuiltin()) {
	return PhabricatorPolicies::getMostOpenPolicy();
	}
	if ($this->getIsProfileImage()) {
	return PhabricatorPolicies::getMostOpenPolicy();
	}
	return $this->getViewPolicy();
	case PhabricatorPolicyCapability::CAN_EDIT:
	return PhabricatorPolicies::POLICY_NOONE;
	}
	}

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

	switch ($capability) {
	case PhabricatorPolicyCapability::CAN_VIEW:
	// If you can see the file this file is a transform of, you can see
	// this file.
	if ($this->getOriginalFile()) {
	return true;
	}

	// 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.');
	$out[] = pht(
	'Thumbnails are visible only to users who can view the original '.
	'file.');
	break;
	}

	return $out;
	}


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


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


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


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


	/* -( PhabricatorDestructibleInterface )----------------------------------- */


	public function destroyObjectPermanently(
	PhabricatorDestructionEngine $engine) {

	$this->openTransaction();
	$this->delete();
	$this->saveTransaction();
	}

	}

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