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PhabricatorFileImageProxyController.php
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Created
Wed, Apr 2, 01:33

PhabricatorFileImageProxyController.php
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<?php
final class PhabricatorFileImageProxyController
extends PhabricatorFileController {
public function shouldAllowPublic() {
return true;
}
public function handleRequest(AphrontRequest $request) {
$show_prototypes = PhabricatorEnv::getEnvConfig(
'phabricator.show-prototypes');
if (!$show_prototypes) {
throw new Exception(
pht('Show prototypes is disabled.
Set `phabricator.show-prototypes` to `true` to use the image proxy'));
}
$viewer = $request->getViewer();
$img_uri = $request->getStr('uri');
// Validate the URI before doing anything
PhabricatorEnv::requireValidRemoteURIForLink($img_uri);
$uri = new PhutilURI($img_uri);
$proto = $uri->getProtocol();
if (!in_array($proto, array('http', 'https'))) {
throw new Exception(
pht('The provided image URI must be either http or https'));
}
// Check if we already have the specified image URI downloaded
$cached_request = id(new PhabricatorFileExternalRequest())->loadOneWhere(
'uriIndex = %s',
PhabricatorHash::digestForIndex($img_uri));
if ($cached_request) {
return $this->getExternalResponse($cached_request);
}
$ttl = PhabricatorTime::getNow() + phutil_units('7 days in seconds');
$external_request = id(new PhabricatorFileExternalRequest())
->setURI($img_uri)
->setTTL($ttl);
$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
// Cache missed so we'll need to validate and download the image
try {
// Rate limit outbound fetches to make this mechanism less useful for
// scanning networks and ports.
PhabricatorSystemActionEngine::willTakeAction(
array($viewer->getPHID()),
new PhabricatorFilesOutboundRequestAction(),
1);
$file = PhabricatorFile::newFromFileDownload(
$uri,
array(
'viewPolicy' => PhabricatorPolicies::POLICY_NOONE,
'canCDN' => true,
));
if (!$file->isViewableImage()) {
$mime_type = $file->getMimeType();
$engine = new PhabricatorDestructionEngine();
$engine->destroyObject($file);
$file = null;
throw new Exception(
pht(
'The URI "%s" does not correspond to a valid image file, got '.
'a file with MIME type "%s". You must specify the URI of a '.
'valid image file.',
$uri,
$mime_type));
} else {
$file->save();
}
$external_request->setIsSuccessful(true)
->setFilePHID($file->getPHID())
->save();
unset($unguarded);
return $this->getExternalResponse($external_request);
} catch (HTTPFutureHTTPResponseStatus $status) {
$external_request->setIsSuccessful(false)
->setResponseMessage($status->getMessage())
->save();
return $this->getExternalResponse($external_request);
} catch (Exception $ex) {
// Not actually saving the request in this case
$external_request->setResponseMessage($ex->getMessage());
return $this->getExternalResponse($external_request);
}
}
private function getExternalResponse(
PhabricatorFileExternalRequest $request) {
if ($request->getIsSuccessful()) {
$file = id(new PhabricatorFileQuery())
->setViewer(PhabricatorUser::getOmnipotentUser())
->withPHIDs(array($request->getFilePHID()))
->executeOne();
if (!file) {
throw new Exception(pht(
'The underlying file does not exist, but the cached request was '.
'successful. This likely means the file record was manually deleted '.
'by an administrator.'));
}
return id(new AphrontRedirectResponse())
->setIsExternal(true)
->setURI($file->getViewURI());
} else {
throw new Exception(pht(
"The request to get the external file from '%s' was unsuccessful:\n %s",
$request->getURI(),
$request->getResponseMessage()));
}
}
}

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