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Filename : identity_select.php
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<?php

/**
 * Identity selection based on additional message headers.
 *
 * On reply to a message user identity selection is based on
 * content of standard headers i.e. From, To, Cc and Return-Path.
 * Here you can add header(s) set by your SMTP server (e.g.
 * Delivered-To, Envelope-To, X-Envelope-To, X-RCPT-TO) to make
 * identity selection more accurate.
 *
 * Enable the plugin in config.inc.php and add your desired headers:
 *   $config['identity_select_headers'] = ['Delivered-To'];
 *
 * Note: 'Received' header is also supported, but has bigger impact
 *       on performance, as it's body is potentially much bigger
 *       than other headers used by Roundcube
 *
 * @author Aleksander Machniak <alec@alec.pl>
 * @license GNU GPLv3+
 */
class identity_select extends rcube_plugin
{
    public $task = 'mail';


    function init()
    {
        $this->add_hook('identity_select', [$this, 'select']);
        $this->add_hook('storage_init', [$this, 'storage_init']);
    }

    /**
     * Adds additional headers to supported headers list
     */
    function storage_init($p)
    {
        $rcmail = rcmail::get_instance();

        if ($add_headers = (array) $rcmail->config->get('identity_select_headers', [])) {
            $add_headers = strtoupper(join(' ', $add_headers));

            if (isset($p['fetch_headers'])) {
                $p['fetch_headers'] .= ' ' . $add_headers;
            }
            else {
                $p['fetch_headers'] = $add_headers;
            }
        }

        return $p;
    }

    /**
     * Identity selection
     */
    function select($p)
    {
        if ($p['selected'] !== null || empty($p['message']->headers)) {
            return $p;
        }

        $rcmail = rcmail::get_instance();

        foreach ((array) $rcmail->config->get('identity_select_headers', []) as $header) {
            if ($emails = $this->get_email_from_header($p['message'], $header)) {
                foreach ($p['identities'] as $idx => $ident) {
                    if (in_array($ident['email_ascii'], $emails)) {
                        $p['selected'] = $idx;
                        break 2;
                    }
                }
            }
        }

        return $p;
    }

    /**
     * Extract email address from specified message header
     */
    protected function get_email_from_header($message, $header)
    {
        $value = $message->headers->get($header, false);

        if (strtolower($header) == 'received') {
            // find first email address in all Received headers
            $email = null;
            foreach ((array) $value as $entry) {
                if (preg_match('/[\s\t]+for[\s\t]+<([^>]+)>/', $entry, $matches)) {
                    $email = $matches[1];
                    break;
                }
            }

            $value = $email;
        }

        return (array) $value;
    }
}