<?php
/**
 *
 * This file is part of HESK - PHP Help Desk Software.
 *
 * (c) Copyright Klemen Stirn. All rights reserved.
 * https://www.hesk.com
 *
 * For the full copyright and license agreement information visit
 * https://www.hesk.com/eula.php
 *
 */

/* Check if this is a valid include */
if (!defined('IN_SCRIPT')) {die('Invalid attempt');}

// Include all functions needed for email piping
hesk_load_database_functions();
require(HESK_PATH . 'inc/email_functions.inc.php');
require(HESK_PATH . 'inc/posting_functions.inc.php');
require(HESK_PATH . 'inc/mail/rfc822_addresses.php');
require(HESK_PATH . 'inc/mail/mime_parser.php');
require(HESK_PATH . 'inc/mail/email_parser.php');

/*** FUNCTIONS ***/

function hesk_email2ticket($results, $pop3 = 0, $set_category = 1, $set_priority = -1)
{
	global $hesk_settings, $hesklang, $hesk_db_link, $ticket;

	// Process "Reply-To:" or "From:" email
	$tmpvar['email'] = isset($results['reply-to'][0]['address']) ? hesk_validateEmail($results['reply-to'][0]['address'],'ERR',0) : hesk_validateEmail($results['from'][0]['address'],'ERR',0);

	// Email missing, invalid or banned?
	if ( ! $tmpvar['email'] || hesk_isBannedEmail($tmpvar['email']) )
	{
		return hesk_cleanExit();
	}

	// Process "Reply-To:" or "From:" name, convert to UTF-8, set to "[Customer]" if not set
	if ( isset($results['reply-to'][0]['name']) && strlen($results['reply-to'][0]['name']) )
	{
   		$tmpvar['name'] = $results['reply-to'][0]['name'];
		if ( ! empty($results['reply-to'][0]['encoding']) )
		{
			$tmpvar['name'] = hesk_encodeUTF8($tmpvar['name'], $results['reply-to'][0]['encoding']);
		}
	}
	else
	{
   		$tmpvar['name'] = isset($results['from'][0]['name']) ? $results['from'][0]['name'] : $hesklang['pde'];
		if ( ! empty($results['from'][0]['encoding']) )
		{
			$tmpvar['name'] = hesk_encodeUTF8($tmpvar['name'], $results['from'][0]['encoding']);
		}
	}
	$tmpvar['name'] = hesk_input($tmpvar['name'],'','',1,50) or $tmpvar['name'] = $hesklang['pde'];

	// Process "To:" email (not yet implemented, for future use)
	// $tmpvar['to_email']	= hesk_validateEmail($results['to'][0]['address'],'ERR',0);

	// Process email subject, convert to UTF-8, set to "[Piped email]" if none set
	$tmpvar['subject'] = isset($results['subject']) ? $results['subject'] : $hesklang['pem'];
	if ( ! empty($results['subject_encoding']) )
	{
		$tmpvar['subject'] = hesk_encodeUTF8($tmpvar['subject'], $results['subject_encoding']);
	}
	$tmpvar['subject'] = hesk_input($tmpvar['subject'],'','',1,70) or $tmpvar['subject'] = $hesklang['pem'];

	// Process email message, convert to UTF-8
	$tmpvar['message'] = isset($results['message']) ? $results['message'] : '';
	if ( ! empty($results['encoding']) )
	{
		$tmpvar['message'] = hesk_encodeUTF8($tmpvar['message'], $results['encoding']);
	}
	$tmpvar['message'] = hesk_input($tmpvar['message'],'','',1);

	// Message missing?
	if ( strlen($tmpvar['message']) == 0)
	{
		// Message required? Ignore this email.
		if ($hesk_settings['eml_req_msg'])
		{
			return hesk_cleanExit();
		}

		// Message not required? Assign a default message
		$tmpvar['message'] = $hesklang['def_msg'];

		// Track duplicate emails based on subject
		$message_hash = md5($tmpvar['subject']);
	}
	else
	{
    	$message_hash = md5($tmpvar['message']);
	}

	// Strip quoted reply from email
    $tmpvar['message'] = hesk_stripQuotedText($tmpvar['message']);

	// Convert URLs to links, change newlines to <br />
	$tmpvar['message'] = hesk_makeURL($tmpvar['message']);
	$tmpvar['message'] = nl2br($tmpvar['message']);

	# For debugging purposes
    # die( bin2hex($tmpvar['message']) );
    # die($tmpvar['message']);

	// Try to detect "delivery failed" and "noreply" emails - ignore if detected
	if ( hesk_isReturnedEmail($tmpvar) )
	{
		return hesk_cleanExit();
	}

	// Check for email loops
	if ( hesk_isEmailLoop($tmpvar['email'], $message_hash) )
	{
		return hesk_cleanExit();
	}

	// OK, everything seems OK. Now determine if this is a reply to a ticket or a new ticket
	if ( preg_match('/\[#([A-Z0-9]{3}\-[A-Z0-9]{3}\-[A-Z0-9]{4})\]/', str_replace(' ', '', $tmpvar['subject']), $matches) )
	{
		// We found a possible tracking ID
		$tmpvar['trackid'] = $matches[1];

	    // Does it match one in the database?
		$res = hesk_dbQuery("SELECT * FROM `".hesk_dbEscape($hesk_settings['db_pfix'])."tickets` WHERE `trackid`='".hesk_dbEscape($tmpvar['trackid'])."' LIMIT 1");
		if (hesk_dbNumRows($res))
		{
			$ticket = hesk_dbFetchAssoc($res);

	        // Do email addresses match?
	        if ( strpos( strtolower($ticket['email']), strtolower($tmpvar['email']) ) === false )
	        {
	        	$tmpvar['trackid'] = '';
	        }

	        // Is this ticket locked? Force create a new one if it is
	        if ($ticket['locked'])
	        {
	        	$tmpvar['trackid'] = '';
	        }
	    }
	    else
	    {
	    	$tmpvar['trackid'] = '';
	    }
	}

	// If tracking ID is empty, generate a new one
	if ( empty($tmpvar['trackid']) )
	{
		$tmpvar['trackid'] = hesk_createID();
	    $is_reply = 0;
	}
	else
	{
		$is_reply = 1;
	}

	// Process attachments
    $tmpvar['attachmment_notices'] = '';
	$tmpvar['attachments'] = '';
	$num = 0;
	if ($hesk_settings['attachments']['use'] && isset($results['attachments'][0]))
	{
	    foreach ($results['attachments'] as $k => $v)
	    {

			// Clean attachment names
			$myatt['real_name'] = hesk_cleanFileName($v['orig_name']);

	    	// Check number of attachments, delete any over max number
	        if ($num >= $hesk_settings['attachments']['max_number'])
	        {
            	$tmpvar['attachmment_notices'] .= sprintf($hesklang['attnum'], $myatt['real_name']) . "\n";
	            continue;
	        }

	        // Check file extension
			$ext = strtolower(strrchr($myatt['real_name'], "."));
			if (!in_array($ext,$hesk_settings['attachments']['allowed_types']))
			{
            	$tmpvar['attachmment_notices'] .= sprintf($hesklang['atttyp'], $myatt['real_name']) . "\n";
				continue;
			}

	        // Check file size
	        $myatt['size'] = $v['size'];
			if ($myatt['size'] > ($hesk_settings['attachments']['max_size']))
			{
            	$tmpvar['attachmment_notices'] .= sprintf($hesklang['attsiz'], $myatt['real_name']) . "\n";
				continue;
			}

			// Generate a random file name
			$useChars='AEUYBDGHJLMNPQRSTVWXZ123456789';
			$tmp = $useChars{mt_rand(0,29)};
			for($j=1;$j<10;$j++)
			{
			    $tmp .= $useChars{mt_rand(0,29)};
			}
		    $myatt['saved_name'] = substr($tmpvar['trackid'] . '_' . md5($tmp . $myatt['real_name']), 0, 200) . $ext;

	        // Rename the temporary file
	        rename($v['stored_name'],HESK_PATH.$hesk_settings['attach_dir'].'/'.$myatt['saved_name']);

	        // Insert into database
	        hesk_dbQuery("INSERT INTO `".hesk_dbEscape($hesk_settings['db_pfix'])."attachments` (`ticket_id`,`saved_name`,`real_name`,`size`) VALUES ('".hesk_dbEscape($tmpvar['trackid'])."','".hesk_dbEscape($myatt['saved_name'])."','".hesk_dbEscape($myatt['real_name'])."','".intval($myatt['size'])."')");
	        $tmpvar['attachments'] .= hesk_dbInsertID() . '#' . $myatt['real_name'] .',';

	        $num++;
	    }

        if (strlen($tmpvar['attachmment_notices']))
        {
        	$tmpvar['message'] .= "<br /><br />" . hesk_input($hesklang['attrem'],'','',1) . "<br />" . nl2br(hesk_input($tmpvar['attachmment_notices'],'','',1));
        }
	}

	// Delete the temporary files
	deleteAll($results['tempdir']);

	// If this is a reply add a new reply
	if ($is_reply)
	{
		// Set last replier name to customer name
		$ticket['lastreplier'] = ($tmpvar['name'] == $hesklang['pde']) ? $tmpvar['email'] : $tmpvar['name'];;

		// If staff hasn't replied yet, keep ticket status "New", otherwise set it to "Waiting reply from staff"
		$ticket['status'] = $ticket['status'] ? 1 : 0;

		// Update ticket as necessary
		hesk_dbQuery("UPDATE `".hesk_dbEscape($hesk_settings['db_pfix'])."tickets` SET `lastchange`=NOW(),`status`='{$ticket['status']}',`replies`=`replies`+1,`lastreplier`='0' WHERE `id`='".intval($ticket['id'])."'");

		// If customer replied, we assume staff replies have been read (no way to be sure if ticket.php hasn't been opened)
		hesk_dbQuery("UPDATE `".hesk_dbEscape($hesk_settings['db_pfix'])."replies` SET `read` = '1' WHERE `replyto` = '".intval($ticket['id'])."' AND `staffid` != '0' ");

		// Insert reply into database
		hesk_dbQuery("INSERT INTO `".hesk_dbEscape($hesk_settings['db_pfix'])."replies` (`replyto`,`name`,`message`,`dt`,`attachments`) VALUES ('".intval($ticket['id'])."','".hesk_dbEscape($ticket['lastreplier'])."','".hesk_dbEscape($tmpvar['message'])."',NOW(),'".hesk_dbEscape($tmpvar['attachments'])."')");

		// --> Prepare reply message

		// 1. Generate the array with ticket info that can be used in emails
		$info = array(
		'email'			=> $ticket['email'],
		'category'		=> $ticket['category'],
		'priority'		=> $ticket['priority'],
		'owner'			=> $ticket['owner'],
		'trackid'		=> $ticket['trackid'],
		'status'		=> $ticket['status'],
		'name'			=> $ticket['name'],
		'lastreplier'	=> $ticket['lastreplier'],
		'subject'		=> $ticket['subject'],
		'message'		=> stripslashes($tmpvar['message']),
		'attachments'	=> $tmpvar['attachments'],
		'dt'			=> hesk_date($ticket['dt'], true),
		'lastchange'	=> hesk_date($ticket['lastchange'], true),
        'id'			=> $ticket['id'],
		);

		// 2. Add custom fields to the array
		foreach ($hesk_settings['custom_fields'] as $k => $v)
		{
			$info[$k] = $v['use'] ? $ticket[$k] : '';
		}

		// 3. Make sure all values are properly formatted for email
		$ticket = hesk_ticketToPlain($info, 1, 0);

		// --> Process custom fields before sending
		foreach ($hesk_settings['custom_fields'] as $k => $v)
		{
			$ticket[$k] = $v['use'] ? hesk_msgToPlain($ticket[$k], 1) : '';
		}

		// --> If ticket is assigned just notify the owner
		if ($ticket['owner'])
		{
			hesk_notifyAssignedStaff(false, 'new_reply_by_customer', 'notify_reply_my');
		}
		// --> No owner assigned, find and notify appropriate staff
		else
		{
			hesk_notifyStaff('new_reply_by_customer',"`notify_reply_unassigned`='1'");
		}

		return $ticket['trackid'];

	} // END REPLY

	// Not a reply, but a new ticket. Add it to the database
	$tmpvar['category'] 	= $set_category;
	$tmpvar['priority'] 	= $set_priority < 0 ? hesk_getCategoryPriority($tmpvar['category']) : $set_priority;

	// Auto assign tickets if aplicable
	$tmpvar['owner']   = 0;
	$tmpvar['history'] = $pop3 ? sprintf($hesklang['thist16'], hesk_date()) : sprintf($hesklang['thist11'], hesk_date());
	$tmpvar['openedby'] = $pop3 ? -2 : -1;

	$autoassign_owner = hesk_autoAssignTicket($tmpvar['category']);

	#print_r($autoassign_owner);

	if ($autoassign_owner)
	{
		$tmpvar['owner'] = $autoassign_owner['id'];
	    $tmpvar['history'] .= sprintf($hesklang['thist10'],hesk_date(),$autoassign_owner['name'].' ('.$autoassign_owner['user'].')');
	}

	// Custom fields will be empty as there is no reliable way of detecting them
	foreach ($hesk_settings['custom_fields'] as $k=>$v)
	{
		$tmpvar[$k] = '';
	}

	// Insert ticket to database
	$ticket = hesk_newTicket($tmpvar);

	// Notify the customer
	if ($hesk_settings['notify_new'])
	{
		$possible_SPAM = false;

		// Do we need to check subject for SPAM tags?
		if ($hesk_settings['notify_skip_spam'])
		{
			foreach ($hesk_settings['notify_spam_tags'] as $tag)
			{
				if ( strpos($tmpvar['subject'], $tag) !== false )
				{
					$possible_SPAM = true;
					break;
				}
			}
		}

		// SPAM tags not found or not checked, send email
		if ($possible_SPAM === false)
		{
			hesk_notifyCustomer();
		}
	}

	// Need to notify staff?
	// --> From autoassign?
	if ($tmpvar['owner'] && $autoassign_owner['notify_assigned'])
	{
		hesk_notifyAssignedStaff($autoassign_owner, 'ticket_assigned_to_you');
	}
	// --> No autoassign, find and notify appropriate staff
	elseif ( ! $tmpvar['owner'] )
	{
		hesk_notifyStaff('new_ticket_staff', " `notify_new_unassigned` = '1' ");
	}

    return $ticket['trackid'];
} // END hesk_email2ticket()


function hesk_encodeUTF8($in, $encoding)
{
	$encoding = strtoupper($encoding);

	switch($encoding)
	{
		case 'UTF-8':
			return $in;
            break;
		case 'ISO-8859-1':
			return utf8_encode($in);
			break;
		default:
			return function_exists('iconv') ? iconv($encoding, 'UTF-8', $in) : utf8_encode($in);
			break;
	}
} // END hesk_encodeUTF8()


function hesk_stripQuotedText($message)
{
	global $hesk_settings, $hesklang;

	// Stripping quoted text disabled?
	if ( ! $hesk_settings['strip_quoted'])
	{
		return $message;
	}

	// Loop through available languages and ty to find the tag
	foreach ($hesk_settings['languages'] as $language => $settings)
	{
		if ( ($found = strpos($message, $settings['hr']) ) !== false )
		{
			// "Reply above this line" tag found, strip quoted reply
			$message  = substr($message, 0, $found);
            $message .= "\n" . $hesklang['qrr'];

            // Set language to the detected language
            hesk_setLanguage($language);
			break;
		}
	}

	return $message;
} // END hesk_stripQuotedText()


function hesk_isReturnedEmail($tmpvar)
{
	// Check noreply email addresses
	if ( preg_match('/not?[\-_\.]?reply@/i', $tmpvar['email']) )
	{
		return true;
	}

	// Check mailer daemon email addresses
	if ( preg_match('/mail(er)?[\-_\.]?daemon@/i', $tmpvar['email']) )
	{
		return true;
	}

	// Check autoreply subjects
	if ( preg_match('/^[\[\(]?Auto(mat(ic|ed))?[ \-]?reply/i', $tmpvar['subject']) )
	{
		return true;
	}

	// Check out of office subjects
	if ( preg_match('/^Out of Office/i', $tmpvar['subject']) )
	{
		return true;
	}

	// Check delivery failed email subjects
	if (
	preg_match('/DELIVERY FAILURE/i', $tmpvar['subject']) ||
	preg_match('/Undelivered Mail Returned to Sender/i', $tmpvar['subject']) ||
	preg_match('/Delivery Status Notification \(Failure\)/i', $tmpvar['subject']) ||
	preg_match('/Returned mail\: see transcript for details/i', $tmpvar['subject'])
	)
	{
		return true;
	}

	// Check Mail Delivery sender name
	if ( preg_match('/Mail[ \-_]?Delivery/i', $tmpvar['name']) )
	{
		return true;
	}

	// Check Delivery failed message
	if ( preg_match('/postmaster@/i', $tmpvar['email']) && preg_match('/Delivery has failed to these recipients/i', $tmpvar['message']) )
	{
		return true;
	}

	// No pattern detected, seems like this is not a returned email
	return false;

} // END hesk_isReturnedEmail()


function hesk_isEmailLoop($email, $message_hash)
{
	global $hesk_settings, $hesklang, $hesk_db_link;

	// If $hesk_settings['loop_hits'] is set to 0 this function is disabled
    if ( ! $hesk_settings['loop_hits'])
    {
    	return false;
    }

	// Escape wildcards in email
	$email_like = hesk_dbEscape(hesk_dbLike($email));

	// Delete expired DB entries
	hesk_dbQuery("DELETE FROM `".hesk_dbEscape($hesk_settings['db_pfix'])."pipe_loops` WHERE `dt` < (NOW() - INTERVAL ".intval($hesk_settings['loop_time'])." SECOND) ");

	// Check current entry
	$res = hesk_dbQuery("SELECT `hits`, `message_hash` FROM `".hesk_dbEscape($hesk_settings['db_pfix'])."pipe_loops` WHERE `email` LIKE '{$email_like}' LIMIT 1");

	// Any active entry*
	if (hesk_dbNumRows($res))
	{
		list($num, $md5) = hesk_dbFetchRow($res);

		$num++;

		// Number of emails in a time period reached?
		if ($num >= $hesk_settings['loop_hits'])
		{
			return true;
		}

        // Message exactly the same as in previous email?
        if ($message_hash == $md5)
        {
        	return true;
        }

		// Update DB entry
		hesk_dbQuery("UPDATE `".hesk_dbEscape($hesk_settings['db_pfix'])."pipe_loops` SET `hits` = `hits` + 1, `message_hash` = '".hesk_dbEscape($message_hash)."' WHERE `email` LIKE '{$email_like}'");
	}
	else
	{
		// First instance, insert a new database row
		hesk_dbQuery("INSERT INTO `".hesk_dbEscape($hesk_settings['db_pfix'])."pipe_loops` (`email`, `message_hash`) VALUES ('".hesk_dbEscape($email)."', '".hesk_dbEscape($message_hash)."')");
	}

	// No loop rule trigered
    return false;

} // END hesk_isEmailLoop()


function hesk_cleanExit()
{
	global $results;

	// Delete the temporary files
	deleteAll($results['tempdir']);

	// Return NULL
	return NULL;
} // END hesk_cleanExit()
