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PhabricatorFileDataController.php
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Mon, May 20, 23:04

PhabricatorFileDataController.php
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<?php
final class PhabricatorFileDataController extends PhabricatorFileController {
private $phid;
private $key;
private $file;
public function shouldRequireLogin() {
return false;
}
public function shouldAllowPartialSessions() {
return true;
}
public function handleRequest(AphrontRequest $request) {
$viewer = $request->getViewer();
$this->phid = $request->getURIData('phid');
$this->key = $request->getURIData('key');
$alt = PhabricatorEnv::getEnvConfig('security.alternate-file-domain');
$base_uri = PhabricatorEnv::getEnvConfig('phabricator.base-uri');
$alt_uri = new PhutilURI($alt);
$alt_domain = $alt_uri->getDomain();
$req_domain = $request->getHost();
$main_domain = id(new PhutilURI($base_uri))->getDomain();
$request_kind = $request->getURIData('kind');
$is_download = ($request_kind === 'download');
if (!strlen($alt) || $main_domain == $alt_domain) {
// No alternate domain.
$should_redirect = false;
$is_alternate_domain = false;
} else if ($req_domain != $alt_domain) {
// Alternate domain, but this request is on the main domain.
$should_redirect = true;
$is_alternate_domain = false;
} else {
// Alternate domain, and on the alternate domain.
$should_redirect = false;
$is_alternate_domain = true;
}
$response = $this->loadFile();
if ($response) {
return $response;
}
$file = $this->getFile();
if ($should_redirect) {
return id(new AphrontRedirectResponse())
->setIsExternal(true)
->setURI($file->getCDNURI($request_kind));
}
$response = new AphrontFileResponse();
$response->setCacheDurationInSeconds(60 * 60 * 24 * 30);
$response->setCanCDN($file->getCanCDN());
$begin = null;
$end = null;
// NOTE: It's important to accept "Range" requests when playing audio.
// If we don't, Safari has difficulty figuring out how long sounds are
// and glitches when trying to loop them. In particular, Safari sends
// an initial request for bytes 0-1 of the audio file, and things go south
// if we can't respond with a 206 Partial Content.
$range = $request->getHTTPHeader('range');
if (strlen($range)) {
list($begin, $end) = $response->parseHTTPRange($range);
}
if (!$file->isViewableInBrowser()) {
$is_download = true;
}
$request_type = $request->getHTTPHeader('X-Phabricator-Request-Type');
$is_lfs = ($request_type == 'git-lfs');
if (!$is_download) {
$response->setMimeType($file->getViewableMimeType());
} else {
$is_post = $request->isHTTPPost();
$is_public = !$viewer->isLoggedIn();
// NOTE: Require POST to download files from the primary domain. If the
// request is not a POST request but arrives on the primary domain, we
// render a confirmation dialog. For discussion, see T13094.
// There are two exceptions to this rule:
// Git LFS requests can download with GET. This is safe (Git LFS won't
// execute files it downloads) and necessary to support Git LFS.
// Requests with no credentials may also download with GET. This
// primarily supports downloading files with `arc download` or other
// API clients. This is only "mostly" safe: if you aren't logged in, you
// are likely immune to XSS and CSRF. However, an attacker may still be
// able to set cookies on this domain (for example, to fixate your
// session). For now, we accept these risks because users running
// Phabricator in this mode are knowingly accepting a security risk
// against setup advice, and there's significant value in having
// API development against test and production installs work the same
// way.
$is_safe = ($is_alternate_domain || $is_post || $is_lfs || $is_public);
if (!$is_safe) {
return $this->newDialog()
->setSubmitURI($file->getDownloadURI())
->setTitle(pht('Download File'))
->appendParagraph(
pht(
'Download file %s (%s)?',
phutil_tag('strong', array(), $file->getName()),
phutil_format_bytes($file->getByteSize())))
->addCancelButton($file->getURI())
->addSubmitButton(pht('Download File'));
}
$response->setMimeType($file->getMimeType());
$response->setDownload($file->getName());
}
$iterator = $file->getFileDataIterator($begin, $end);
$response->setContentLength($file->getByteSize());
$response->setContentIterator($iterator);
// In Chrome, we must permit this domain in "object-src" CSP when serving a
// PDF or the browser will refuse to render it.
if (!$is_download && $file->isPDF()) {
$request_uri = id(clone $request->getAbsoluteRequestURI())
->setPath(null)
->setFragment(null)
->setQueryParams(array());
$response->addContentSecurityPolicyURI(
'object-src',
(string)$request_uri);
}
return $response;
}
private function loadFile() {
// Access to files is provided by knowledge of a per-file secret key in
// the URI. Knowledge of this secret is sufficient to retrieve the file.
// For some requests, we also have a valid viewer. However, for many
// requests (like alternate domain requests or Git LFS requests) we will
// not. Even if we do have a valid viewer, use the omnipotent viewer to
// make this logic simpler and more consistent.
// Beyond making the policy check itself more consistent, this also makes
// sure we're consistent about returning HTTP 404 on bad requests instead
// of serving HTTP 200 with a login page, which can mislead some clients.
$viewer = PhabricatorUser::getOmnipotentUser();
$file = id(new PhabricatorFileQuery())
->setViewer($viewer)
->withPHIDs(array($this->phid))
->withIsDeleted(false)
->executeOne();
if (!$file) {
return new Aphront404Response();
}
// We may be on the CDN domain, so we need to use a fully-qualified URI
// here to make sure we end up back on the main domain.
$info_uri = PhabricatorEnv::getURI($file->getInfoURI());
if (!$file->validateSecretKey($this->key)) {
$dialog = $this->newDialog()
->setTitle(pht('Invalid Authorization'))
->appendParagraph(
pht(
'The link you followed to access this file is no longer '.
'valid. The visibility of the file may have changed after '.
'the link was generated.'))
->appendParagraph(
pht(
'You can continue to the file detail page to get more '.
'information and attempt to access the file.'))
->addCancelButton($info_uri, pht('Continue'));
return id(new AphrontDialogResponse())
->setDialog($dialog)
->setHTTPResponseCode(404);
}
if ($file->getIsPartial()) {
$dialog = $this->newDialog()
->setTitle(pht('Partial Upload'))
->appendParagraph(
pht(
'This file has only been partially uploaded. It must be '.
'uploaded completely before you can download it.'))
->appendParagraph(
pht(
'You can continue to the file detail page to monitor the '.
'upload progress of the file.'))
->addCancelButton($info_uri, pht('Continue'));
return id(new AphrontDialogResponse())
->setDialog($dialog)
->setHTTPResponseCode(404);
}
$this->file = $file;
return null;
}
private function getFile() {
if (!$this->file) {
throw new PhutilInvalidStateException('loadFile');
}
return $this->file;
}
}

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