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<?php
/**
* Show additional message headers
*
* Proof-of-concept plugin which will fetch additional headers
* and display them in the message view.
*
* Enable the plugin in config.inc.php and add your desired headers:
* $config['show_additional_headers'] = ['User-Agent'];
*
* @author Thomas Bruederli
* @license GNU GPLv3+
*/
class show_additional_headers extends rcube_plugin
{
public $task = 'mail';
/**
* Plugin initialization
*/
function init()
{
$rcmail = rcmail::get_instance();
if ($rcmail->action == 'show' || $rcmail->action == 'preview') {
$this->add_hook('storage_init', [$this, 'storage_init']);
$this->add_hook('message_headers_output', [$this, 'message_headers']);
}
else if ($rcmail->action == '') {
// with enabled_caching we're fetching additional headers before show/preview
$this->add_hook('storage_init', [$this, 'storage_init']);
}
}
/**
* Handler for 'storage_init' hook, where we tell the core to
* fetch specified additional headers from IMAP.
*
* @params array @p Hook parameters
*
* @return array Modified hook parameters
*/
function storage_init($p)
{
$rcmail = rcmail::get_instance();
$add_headers = $rcmail->config->get('show_additional_headers', []);
if (!empty($add_headers)) {
$add_headers = strtoupper(join(' ', (array) $add_headers));
if (isset($p['fetch_headers'])) {
$p['fetch_headers'] .= ' ' . $add_headers;
}
else {
$p['fetch_headers'] = $add_headers;
}
}
return $p;
}
/**
* Handler for 'message_headers_output' hook, where we add the additional
* headers to the output.
*
* @params array @p Hook parameters
*
* @return array Modified hook parameters
*/
function message_headers($p)
{
$rcmail = rcmail::get_instance();
$add_headers = $rcmail->config->get('show_additional_headers', []);
foreach ((array) $add_headers as $header) {
if ($value = $p['headers']->get($header)) {
if (is_array($value)) {
foreach ($value as $idx => $v) {
$p['output']["$header:$idx"] = ['title' => $header, 'value' => $v];
}
}
else {
$p['output'][$header] = ['title' => $header, 'value' => $value];
}
}
}
return $p;
}
}
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