Phabricator AphrontRequest / Save Error Fix

By  on  

Working on Phabricator extensions has thrust me back into the world of PHP, a language I had only touched via WordPress plugins and blog themes over the past few years.  Despite being away from the language, I was able to jump back in fairly quickly and felt a small "back at home" comfort...until I realized Phabricator was not greatly documented and that I'd need to dive deep into the source code to figure out how to do just about every task.

One error that baffled me for a while was the following:

You are trying to save some data to Phabricator, but the request your browser made included an incorrect token. Reload the page and try again. You may need to clear your cookies.

I was trying to create and save a PhabricatorAuthTemporaryToken instance for the sake of allowing login via a third party service, and the request from that service to Phabricator was made in the background, so there was no PHCID because there was no session, thus the CSRF token was invalid.  Essentially I needed a way to write to Phabricator without a CSRF validation (via PHCID) step.  The solution was simple:

// Turn off CSRF check
$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
// Save token
id(new PhabricatorAuthTemporaryToken())
  ->setTokenResource($transaction_code)
  // ...
  ->save();
// Turn CSRF check back on
unset($unguarded);

AphrontWriteGuard::beginScopedUnguardedWrites() allowed me to turn of the CSRF check, save the token, and then turn the CSRF check back on via unset.  Short amount of code but took a long time to find!

I love that advanced libraries like Phabricator insist on these security checks without developers having to do so explicitly; I also love that turning off this check momentarily is easy.  I'll be sure to share more PHP / Phabricator tips as I run into problems!

Recent Features

  • By
    How I Stopped WordPress Comment Spam

    I love almost every part of being a tech blogger:  learning, preaching, bantering, researching.  The one part about blogging that I absolutely loathe:  dealing with SPAM comments.  For the past two years, my blog has registered 8,000+ SPAM comments per day.  PER DAY.  Bloating my database...

  • By
    Create a CSS Flipping Animation

    CSS animations are a lot of fun; the beauty of them is that through many simple properties, you can create anything from an elegant fade in to a WTF-Pixar-would-be-proud effect. One CSS effect somewhere in between is the CSS flip effect, whereby there's...

Incredible Demos

  • By
    MooTools FontChecker Plugin

    There's a very interesting piece of code on Google Code called FontAvailable which does a jQuery-based JavaScript check on a string to check whether or not your system has a specific font based upon its output width. I've ported this functionality to MooTools. The MooTools...

  • By
    Multiple Background CSS Animations

    CSS background animation has been a hot topic for a long time, mostly because they look pretty sweet and don't require additional elements.  I was recently asked if it was possible to have multiple background animations on a given element and the answer is yes...with...

Discussion

    Wrap your code in <pre class="{language}"></pre> tags, link to a GitHub gist, JSFiddle fiddle, or CodePen pen to embed!