ProxyTools.php

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<?php
function wfGetForwardedFor() {
    wfDeprecated( __METHOD__, '1.19' );
    global $wgRequest;
    return $wgRequest->getHeader( 'X-Forwarded-For' );
}

function wfGetAgent() {
    wfDeprecated( __METHOD__, '1.18' );
    global $wgRequest;
    return $wgRequest->getHeader( 'User-Agent' );
}

function wfGetIP() {
    wfDeprecated( __METHOD__, '1.19' );
    global $wgRequest;
    return $wgRequest->getIP();
}

function wfIsTrustedProxy( $ip ) {
    $trusted = wfIsConfiguredProxy( $ip );
    wfRunHooks( 'IsTrustedProxy', array( &$ip, &$trusted ) );
    return $trusted;
}

function wfIsConfiguredProxy( $ip ) {
    global $wgSquidServers, $wgSquidServersNoPurge;
    $trusted = in_array( $ip, $wgSquidServers ) ||
        in_array( $ip, $wgSquidServersNoPurge );
    return $trusted;
}