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2013-09-05T20:12:36.363
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Looking at the un-minified javascript from foursquare.com/oauth2/authenticate we've tracked down the bug. The problem code comes from the following function: <pre><code>fourSq.auth.Autologin = { maybeFacebookAutologin: function () { window.fourSq.config.enableFacebookAutologin && (!$.cookie("disableFacebookAutologin") && !fourSq.api.models.companion.user.UserUtil.isLoggedIn()) && fourSq.facebook.getFacebookApi(function (a) { a.getLoginStatus(function (b) { if (b === fourSq.facebook.FacebookApi.State.CONNECTED) { var c = (b = location.href.match(/[\?&]continue=([^&]+)/) || location.href.match(/https?:\/\/[^\/]+(.+)/)) ? b[1] : "/"; a.loginWithPermissions(void 0, function () { var a = fourSq.stats.Action.build(fourSq.stats.action.Action.AUTOLOGIN); fourSq.stats.logActionWithDelay(a, function () { $.cookie("disableFacebookAutologin", "1", { expires: 1, path: "/" }); fourSq.util.redirect("/facebook-login?continue\x3d" + c) }) }) } }) }) } }; </code></pre> The problem line is <code>fourSq.util.redirect("/facebook-login?continue\x3d" + c)</code> which does not escape c. This leads to a situation like this (simplified URL for the sake of exposition): <code>http://foursquare.com/facebook-login?continue=/cool/beans?foo=bar&baz=bam</code>. See the issue? All query parameters in the continue URL (except the first one) are instead intepreted as query parameters to /facebook-login! The correct code should be: <pre><code>fourSq.util.redirect("/facebook-login?continue\x3d" + encodeURIComponent(c)) </code></pre> Which will generate the correct output: <a href="http://foursquare.com/facebook-login?continue=%2Fcool%2Fbeans%3Ffoo%3Dbar%26baz%3Dbam" rel="nofollow">http://foursquare.com/facebook-login?continue=%2Fcool%2Fbeans%3Ffoo%3Dbar%26baz%3Dbam</a>
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1. POFoursquare bug: oauth login leads to 404 error if account is connected to Facebook
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1. USJeff Cutler-Stamm
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1. COHmm, does look like a bug. We're taking a look on our end.
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2. COFor the record, foursquare has pushed a fix for this bug. Awesome fast turnaround guys, thanks!
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