show_additional_headers.php
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show_additional_headers.php
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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'] = array('User-Agent');
	*
	* @author Thomas Bruederli
	* @license GNU GPLv3+
	*/
	class show_additional_headers extends rcube_plugin
	{
	public $task = 'mail';

	function init()
	{
	$rcmail = rcmail::get_instance();
	if ($rcmail->action == 'show' \|\| $rcmail->action == 'preview') {
	$this->add_hook('storage_init', array($this, 'storage_init'));
	$this->add_hook('message_headers_output', array($this, 'message_headers'));
	} else if ($rcmail->action == '') {
	// with enabled_caching we're fetching additional headers before show/preview
	$this->add_hook('storage_init', array($this, 'storage_init'));
	}
	}

	function storage_init($p)
	{
	$rcmail = rcmail::get_instance();
	if ($add_headers = (array)$rcmail->config->get('show_additional_headers', array()))
	$p['fetch_headers'] = trim($p['fetch_headers'].' ' . strtoupper(join(' ', $add_headers)));

	return $p;
	}

	function message_headers($p)
	{
	$rcmail = rcmail::get_instance();
	foreach ((array)$rcmail->config->get('show_additional_headers', array()) as $header) {
	if ($value = $p['headers']->get($header))
	$p['output'][$header] = array('title' => $header, 'value' => $value);
	}

	return $p;
	}
	}