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Editing: cloudflare-flexible-ssl.php

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<?php
defined('ABSPATH') || die('Cheatin&#8217; uh?');

/**
 * Check if request is from Cloudflare
 *
 * @since  3.4.1
 * @author Soponar Cristina
 *
 * @return bool
 */
function rocket_is_cloudflare() {
    if ( ! isset( $_SERVER['HTTP_CF_CONNECTING_IP'] ) ) {
        return false;
    }
    // Check if original ip has already been restored, e.g. by nginx - assume it was from cloudflare then
    if ( $_SERVER['REMOTE_ADDR'] === $_SERVER['HTTP_CF_CONNECTING_IP'] ) {
        return true;
    }

return rocket_is_cf_ip();
}

/**
 * Check if a request comes from a CloudFlare IP.
 *
 * @since  3.4.1
 * @author Soponar Cristina
 *
 * @return bool
 */
function rocket_is_cf_ip() {
    // Store original remote address in $original_ip
    $original_ip = $_SERVER['REMOTE_ADDR'];
    if ( ! isset( $original_ip ) ) {
        return false;
    }

$cf_ips_values = get_transient( 'rocket_cloudflare_ips' );

// Cloudflare IPS should always be populated because the code runs before loading Cloudflare addon
    if ( $cf_ips_values === false ) {
        $cf_ips_values = (object) [
            'success' => true,
            'result'  => (object) [],
        ];

$cf_ips_values->result->ipv4_cidrs = [
            '103.21.244.0/22',
            '103.22.200.0/22',
            '103.31.4.0/22',
            '104.16.0.0/12',
            '108.162.192.0/18',
            '131.0.72.0/22',
            '141.101.64.0/18',
            '162.158.0.0/15',
            '172.64.0.0/13',
            '173.245.48.0/20',
            '188.114.96.0/20',
            '190.93.240.0/20',
            '197.234.240.0/22',
            '198.41.128.0/17',
        ];

$cf_ips_values->result->ipv6_cidrs = [
            '2400:cb00::/32',
            '2405:8100::/32',
            '2405:b500::/32',
            '2606:4700::/32',
            '2803:f800::/32',
            '2c0f:f248::/32',
            '2a06:98c0::/29',
        ];
    }

if ( strpos( $original_ip, ':' ) === false ) {
        $cf_ip_ranges = $cf_ips_values->result->ipv4_cidrs;
        foreach ( $cf_ip_ranges as $range ) {
            if ( rocket_ipv4_in_range( $original_ip, $range ) ) {
                return true;
            }
        }
    } else {
        $cf_ip_ranges = $cf_ips_values->result->ipv6_cidrs;
        $ipv6         = get_rocket_ipv6_full( $original_ip );
        foreach ( $cf_ip_ranges as $range ) {
            if ( rocket_ipv6_in_range( $ipv6, $range ) ) {
                return true;
            }
        }
    }

return false;
}

/**
 * Fixes Cloudflare Flexible SSL redirect loop
 *
 * @since  3.4.1
 * @author Soponar Cristina
 */
function rocket_fix_cf_flexible_ssl() {
    $isCf = rocket_is_cloudflare();
    if ( $isCf ) {
        // Fixes Flexible SSL
        if ( isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https' ) {
            $_SERVER['HTTPS'] = 'on';
        }
    }
}

Editing: cloudflare-flexible-ssl.php

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