Public View on MW 1.27.1

[tazinator]

MW 1.27.1 is throwing the following error on the backend when any public user tries to view the wiki and isnt logged in to an SMF account.

PHP Catchable fatal error: Method User::__toString() must return a string value in .../includes/user/User.php on line 3747

Basically throws a 500 and no anonymous users can load any Wiki pages when the integration is enabled. Works just fine for logged in users, just not public.

[jdarwood007]

Are you using the Latest commit (f096e19 on Jul 6, 2014)?

We initially had an issue with our wiki on upgrading to 1.27.1. The only change I can see in our User.php is this:

Zeus:Downloads jeremy$ diff -u original/includes/user/User.php modified/includes/user/User.php
--- original/includes/user/User.php 2016-08-22 13:53:01.000000000 -0700
+++ modified/includes/user/User.php 2016-09-28 17:22:28.000000000 -0700
@@ -3744,7 +3744,7 @@
        } elseif ( !$session->getUser()->equals( $this ) ) {
            \MediaWiki\Logger\LoggerFactory::getInstance( 'session' )
                ->warning( __METHOD__ .
-                   ": Cannot log user \"$this\" out of a user \"{$session->getUser()}\"'s session"
+                   ": Cannot log user \"this\" out of a user \"{$session->getUser()}\"'s session"
                );
            // But we still may as well make this user object anon
            $this->clearInstanceCache( 'defaults' );

Most likely this to me seems like a bug as they shouldn't be using $this since its a special reference to the current object. I hadn't debugged anymore at the time.

[jdarwood007]

Actually looking at it more, it seems that the ip function isn't returning a string for some reason.

When you use $this in a string, it gets handled by the magic function __toString().

    /**
     * @return string
     */
    public function __toString() {
        return $this->getName();
    }

Which of course is handled by getName.

    /**
     * Get the user name, or the IP of an anonymous user
     * @return string User's name or IP address
     */
    public function getName() {
        if ( $this->isItemLoaded( 'name', 'only' ) ) {
            // Special case optimisation
            return $this->mName;
        } else {
            $this->load();
            if ( $this->mName === false ) {
                // Clean up IPs
                $this->mName = IP::sanitizeIP( $this->getRequest()->getIP() );
            }
            return $this->mName;
        }
    }

As it is a guest, it should return their IP

However the IP function has 2 places where a non string could be returned

    public static function sanitizeIP( $ip ) {
        $ip = trim( $ip );
        if ( $ip === '' ) {
            return null;
        }
        if ( self::isIPv4( $ip ) || !self::isIPv6( $ip ) ) {
            return $ip; // nothing else to do for IPv4 addresses or invalid ones
        }

If $ip was null or if it somehow doesn't fall into a valid ipv4 or ipv6 address. Only way to test this at this point would be to see what $this->getRequest()->getIP() is returning.

[tazinator]

Just as a shot, changed my user/User.php to reflect what you guys have and it seems to have resolved the issue.

Changing line 3747 to:

": Cannot log user "this" out of a user "{$session->getUser()}"'s session"

[legoktm]

I filed https://phabricator.wikimedia.org/T148486 upstream for this.

[jdarwood007]

This was fixed by MediaWiki and I haven't had any additional reports on this since then. Closing for now, if it still occurs we can reinvestigate this.