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PORails, OAuth, and CSRF protection
 

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    <p>I am using REST and OAuth to talk to a Rails app (from an iPhone app, but that should not be relevant). However, I am running into some issues with Rails' CSRF protection (via <code>protects_from_forgery</code>).</p> <p>I understand that CSRF protection only kicks in for regular form submissions (i.e. Content-Type=application/x-www-form-urlencoded), so I would be fine if I was submitting JSON or XML data. Unfortunately, OAuth is currently limited to application/x-www-form-urlencoded requests. There's a <a href="http://oauth.googlecode.com/svn/spec/ext/body_hash/1.0/drafts/3/spec.html" rel="nofollow noreferrer">draft spec that extends OAuth to non-form-urlencoded data</a>, but this doesn't help me right now.</p> <p>The way I see it, I have the following options:</p> <ol> <li><p>Send the data as JSON, knowing that it would not be part of the OAuth signature and thus subject to man-in-the-middle attacks. Obviously not an attractive solution.</p></li> <li><p>Create special Rails actions (e.g. <code>UsersController#update_oauth</code>) that internally delegate to the regular actions (e.g. <code>UsersController#update</code>). Then exclude these from the forgery protection (<code>protects_from_forgery :only =&gt; [:update]</code>). This should work and might be borderline acceptable for one or two actions, but obviously would be a very messy solution.</p></li> <li><p>Override the Rails CSRF protection to ignore OAuth requests. I have not tried this, but it seems like it should be possible to change one of the hooks (perhaps the <code>verify_authenticity_token</code> filter) to consider OAuth requests successful.</p></li> </ol> <p>Has anybody run into this before? Any recommendations? Or am I perhaps missing something basic?</p>
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