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Bug #55008 PHP Filter email doesn't work for facebook emails
Submitted: 2011-06-07 16:25 UTC Modified: 2011-06-07 17:52 UTC
From: zedorg at gmail dot com Assigned:
Status: Not a bug Package: Filter related
PHP Version: 5.3.6 OS: x86_64 GNU/Linux
Private report: No CVE-ID: None
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From: zedorg at gmail dot com
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 [2011-06-07 16:25 UTC] zedorg at gmail dot com
Description:
------------
Hello,

it seems the filter function is not working the "new" facebook emails like: apps+xxxxxxxxxxxxxxx.xxxxxxxxxxxxxxx.xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx@proxymail.facebook.com where x is an alpha numeric character. It returns false.

This new feature comes from 2010 January, see: http://www.allfacebook.com/facebook-developers-prepare-to-gain-access-to-user-emails-2010-01

We got a lot of validation failures, cause of this, from facebook connected users, when we trying to use filter_var on these emails.

A bit strange, cause if I change the "apps+xxxxxxxxxxxxxxx" to "apps+xxxxxxxxxx", 5 letter shorted, it accepts. However this won't help us :)

Test script:
---------------
<?php

var_dump(filter_var("apps+xxxxxxxxxxxxxxx.xxxxxxxxxxxxxxx.xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx@proxymail.facebook.com", FILTER_VALIDATE_EMAIL));


Expected result:
----------------
It should return the given email address.

Actual result:
--------------
Returns false.

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 [2011-06-07 16:29 UTC] zedorg at gmail dot com
Checked rfc, if this is the good one http://tools.ietf.org/html/rfc5321 , and it says "The maximum total length of a user name or other local-part is 64 octets."
However facebook uses 70?
 [2011-06-07 17:52 UTC] dtajchreber@php.net
-Status: Open +Status: Bogus
 [2011-06-07 17:52 UTC] dtajchreber@php.net
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

The filter extension uses a regular expression based on RFC 5321, which like you 
found, says that the limit on a local-part of an e-mail is 64 octets. 

[1] http://lxr.php.net/xref/PHP_5_3/ext/filter/logical_filters.c#499
[2] http://tools.ietf.org/html/rfc5321#section-4.5.3.1
 [2011-06-08 17:09 UTC] zedorg at gmail dot com
Just for who has the similar problem: facebook accepts these emails without the "apps+" prefix, so this can be cut from email and then its rfc compliant again.
 
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