<?php

/*

 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between

 * Copyright (C) 2006-2009 Dan Fuhry

 *

 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied

 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.

 * 

 * The "emailer" class was ported from phpBB 2.0. Copyright (C) 2002-2006 phpBB Group. phpBB is licensed under the GPLv2.

 */

//

// The emailer class has support for attaching files, that isn't implemented

// in the 2.0 release but we can probable find some way of using it in a future

// release

//

class emailer

{

	var $msg, $subject, $extra_headers;

	var $addresses, $reply_to, $from;

	var $use_smtp;

	var $tpl_msg;

	function __construct($use_smtp)

	{

		$this->reset();

		$this->use_smtp = $use_smtp;

		$this->reply_to = $this->from = '';

	}

	// Resets all the data (address, template file, etc etc to default

	function reset()

	{

		$this->addresses = array();

		$this->vars = $this->msg = $this->extra_headers = '';

	}

	// Sets an email address to send to

	function email_address($address)

	{

		$this->addresses['to'] = trim($address);

	}

	function cc($address)

	{

		$this->addresses['cc'][] = trim($address);

	}

	function bcc($address)

	{

		$this->addresses['bcc'][] = trim($address);

	}

	function replyto($address)

	{

		$this->reply_to = trim($address);

	}

	function from($address)

	{

		$this->from = trim($address);

	}

	// set up subject for mail

	function set_subject($subject = '')

	{

		$this->subject = trim(preg_replace('#[\n\r]+#s', '', $subject));

	}

	// set up extra mail headers

	function extra_headers($headers)

	{

		$this->extra_headers .= trim($headers) . "\n";

	}

	function use_template($template_code)

	{

		global $db, $session, $paths, $template, $plugins; // Common objects

		$this->tpl_msg = $template->makeParserText($template_code);

		return true;

	}

	// assign variables

	function assign_vars($vars)

	{

		if ( is_object($this->tpl_msg) )

		{

			$this->tpl_msg->assign_vars($vars);

		}

		else

		{

			die_friendly(GENERAL_ERROR, 'Can\'t set vars, the template is not set');

		}

	}

	// Send the mail out to the recipients set previously in var $this->address

	function send()

	{

		global $db, $session, $paths, $template, $plugins; // Common objects

		$this->msg = $this->tpl_msg->run();

		if ( empty($this->msg) )

		{

			die_friendly(GENERAL_ERROR, 'Template for e-mail message returned a blank');

		}

		// We now try and pull a subject from the email body ... if it exists,

		// do this here because the subject may contain a variable

		$drop_header = '';

		$match = array();

		if (preg_match('#^(Subject:(.*?))$#m', $this->msg, $match))

		{

			$this->subject = (trim($match[2]) != '') ? trim($match[2]) : (($this->subject != '') ? $this->subject : 'No Subject');

			$drop_header .= '[\r\n]*?' . preg_quote($match[1], '#');

		}

		else

		{

			$this->subject = (($this->subject != '') ? $this->subject : 'No Subject');

		}

		if (preg_match('#^(Charset:(.*?))$#m', $this->msg, $match))

		{

			$this->encoding = (trim($match[2]) != '') ? trim($match[2]) : trim('iso-8859-1');

			$drop_header .= '[\r\n]*?' . preg_quote($match[1], '#');

		}

		else

		{

			$this->encoding = trim('iso-8859-1');

		}

		if ($drop_header != '')

		{

			$this->msg = trim(preg_replace('#' . $drop_header . '#s', '', $this->msg));

		}

		$to = $this->addresses['to'];

		$cc = (count($this->addresses['cc'])) ? implode(', ', $this->addresses['cc']) : '';

		$bcc = (count($this->addresses['bcc'])) ? implode(', ', $this->addresses['bcc']) : '';

		// Build header

		$this->extra_headers = (($this->reply_to != '') ? "Reply-to: $this->reply_to\n" : '') .

 													(($this->from != '') ? "From: $this->from\n" : "From: " . getConfig('contact_email') . "\n") .

 													"Return-Path: " . getConfig('contact_email') .

 													"\nMessage-ID: <" . md5(uniqid(time())) . "@" . $_SERVER['SERVER_NAME'] . ">\nMIME-Version: 1.0\nContent-type: text/plain; charset=" . $this->encoding .

 													"\nContent-transfer-encoding: 8bit\nDate: " . enano_date('r', time()) .

 													"\nX-Priority: 3\nX-MSMail-Priority: Normal\nX-Mailer: PHP\nX-MimeOLE: Produced By Enano CMS\n" .

 													$this->extra_headers .

 													(($cc != '') ? "Cc: $cc\n" : '')  .

 													(($bcc != '') ? "Bcc: $bcc\n" : '');

		//die('<pre>'.print_r($this,true).'</pre>');

		// Send message ... removed $this->encode() from subject for time being

		if ( $this->use_smtp )

		{

			$result = smtp_send_email_core($to, $this->subject, $this->msg, $this->extra_headers);

		}

		else

		{

			$empty_to_header = ($to == '') ? TRUE : FALSE;

			$to = ($to == '') ? ((getConfig('sendmail_fix')=='1') ? ' ' : 'Undisclosed-recipients:;') : $to;

			$result = @mail($to, $this->subject, preg_replace("#(?<!\r)\n#s", "\n", $this->msg), $this->extra_headers);

			if (!$result && !getConfig('sendmail_fix') && $empty_to_header)

			{

				$to = ' ';

				setConfig('sendmail_fix', '1');

				$result = @mail($to, $this->subject, preg_replace("#(?<!\r)\n#s", "\n", $this->msg), $this->extra_headers);

			}

		}

		// Did it work?

		if (!$result || ( $this->use_smtp && $result != 'success' ))

		{

			die_friendly(GENERAL_ERROR, 'Failed sending email :: ' . (($this->use_smtp) ? 'SMTP' : 'PHP') . ' :: ' . $result);

		}

		return true;

	}

	// Encodes the given string for proper display for this encoding ... nabbed 

	// from php.net and modified. There is an alternative encoding method which 

	// may produce lesd output but it's questionable as to its worth in this 

	// scenario IMO

	function encode($str)

	{

		if ($this->encoding == '')

		{

			return $str;

		}

		// define start delimimter, end delimiter and spacer

		$end = "?=";

		$start = "=?$this->encoding?B?";

		$spacer = "$end\r\n $start";

		// determine length of encoded text within chunks and ensure length is even

		$length = 75 - strlen($start) - strlen($end);

		$length = floor($length / 2) * 2;

		// encode the string and split it into chunks with spacers after each chunk

		$str = chunk_split(base64_encode($str), $length, $spacer);

		// remove trailing spacer and add start and end delimiters

		$str = preg_replace('#' . preg_quote($spacer, '#') . '$#', '', $str);

		return $start . $str . $end;

	}

	//

	// Attach files via MIME.

	//

	function attachFile($filename, $mimetype = "application/octet-stream", $szFromAddress, $szFilenameToDisplay)

	{

		global $lang;

		$mime_boundary = "--==================_846811060==_";

		$this->msg = '--' . $mime_boundary . "\nContent-Type: text/plain;\n\tcharset=".'"' . $lang['ENCODING'] . '"'."\n\n" . $this->msg;

		if ($mime_filename)

		{

			$filename = $mime_filename;

			$encoded = $this->encode_file($filename);

		}

		$fd = fopen($filename, "r");

		$contents = fread($fd, filesize($filename));

		$this->mimeOut = "--" . $mime_boundary . "\n";

		$this->mimeOut .= "Content-Type: " . $mimetype . ";\n\tname=".'"'."$szFilenameToDisplay".'"'."\n";

		$this->mimeOut .= "Content-Transfer-Encoding: quoted-printable\n";

		$this->mimeOut .= "Content-Disposition: attachment;\n\tfilename=".'"'."$szFilenameToDisplay".'"'."\n\n";

		if ( $mimetype == "message/rfc822" )

		{

			$this->mimeOut .= "From: ".$szFromAddress."\n";

			$this->mimeOut .= "To: ".$this->emailAddress."\n";

			$this->mimeOut .= "Date: ".enano_date('r') . " UT\n";

			$this->mimeOut .= "Reply-To:".$szFromAddress."\n";

			$this->mimeOut .= "Subject: ".$this->mailSubject."\n";

			$this->mimeOut .= "X-Mailer: PHP/".phpversion()."\n";

			$this->mimeOut .= "MIME-Version: 1.0\n";

		}

		$this->mimeOut .= $contents."\n";

		$this->mimeOut .= "--" . $mime_boundary . "--" . "\n";

		return $out;

		// added -- to notify email client attachment is done

	}

	function getMimeHeaders($filename, $mime_filename="")

	{

		$mime_boundary = "--==================_846811060==_";

		if ($mime_filename)

		{

			$filename = $mime_filename;

		}

		$out = "MIME-Version: 1.0\n";

		$out .= "Content-Type: multipart/mixed;\n\tboundary=".'"'."$mime_boundary".'"'."\n\n";

		$out .= "This message is in MIME format. Since your mail reader does not understand\n";

		$out .= "this format, some or all of this message may not be legible.";

		return $out;

	}

	//

 	// Split string by RFC 2045 semantics (76 chars per line, end with \r\n).

	//

	function myChunkSplit($str)

	{

		$stmp = $str;

		$len = strlen($stmp);

		$out = "";

		while ($len > 0)

		{

			if ($len >= 76)

			{

				$out .= substr($stmp, 0, 76) . "\r\n";

				$stmp = substr($stmp, 76);

				$len = $len - 76;

			}

			else

			{

				$out .= $stmp . "\r\n";

				$stmp = "";

				$len = 0;

			}

		}

		return $out;

	}

	//

 	// Split the specified file up into a string and return it

	//

	function encode_file($sourcefile)

	{

		if (is_readable(@realpath($sourcefile)))

		{

			$fd = fopen($sourcefile, "r");

			$contents = fread($fd, filesize($sourcefile));

				$encoded = $this->myChunkSplit(base64_encode($contents));

				fclose($fd);

		}

		return $encoded;

	}

} // class emailer

/**

 * This code is copyright (C) 2004 Jim Tucek

 * PHP version ported from Javascript by Dan Fuhry

 * All rights reserved.

 * @link http://www.jracademy.com/~jtucek/email/

 * @license GNU General Public License v2, permission obtained specifically for Enano

 */

class EmailEncryptor

{

	var $primes = Array(2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199);

	function __construct()

	{

		$i = 0;

		$this->p = 0;

		$this->q = 0;

		while($this->p * $this->q < 255 || $this->p == $this->q)

		{

			$this->p = $this->primes[mt_rand(0, sizeof($this->primes)-1)];

			$this->q = $this->primes[mt_rand(0, sizeof($this->primes)-1)];

		}

	}

	function testAll() {

		$size = sizeof($this->primes);

		$allCharacters = "";

		for($c = 33; $c <= 126; $c++)

			$allCharacters = $allCharacters . $this->fromCharCode($c);

		for($i = 0; $i < $size - 1; $i++) {

			for($j = $i + 1; $j < $size; $j++) {

				$this->p = $this->primes[$i];

				$this->q = $this->primes[$j];

				if($this->p*$this->q < 255)

					break;

				$k = $this->makeKey($allCharacters);

				$encrypted = $k['X'];

				$decrypted = $this->goForth($encrypted,$this->p*$this->q,$k['D']);

				if($decrypted != $allCharacters) {

					die('Test failed');

				}

			}

		}

		return 'GOOD';

	}

	function charCodeAt($str, $i)

	{

		return ord(substr($str, $i, 1));

	}

	function fromCharCode($str)

	{

		return chr($str);

	}

	function MakeArray($l) {

		$a = Array();

		$i=0;

		do {

			$a[$i]=null;

			$i++;

		} while($i < $l);

		return $a;

	}

	function makeKey($addr,$subj = '',$body = '') {

		$value = "";

		if($this->p * $this->q < 255)

		{

			return("P*Q must be greater than 255! P*Q = " . $this->p*$this->q);

		}

		elseif($this->p == $this->q)

		{

			return("P cannot be equal to Q!");

		}

		elseif($addr == "")

		{

			return("You must enter an address to encrypt!");

		}

		else

		{

			// Make the key

			$c = 0;

			$z = ($this->p-1)*($this->q-1);

			$e = 0;

			$n = $this->p*$this->q;

			$d = 0;

			do {

				$e++;

				$d = $this->getKey($this->primes[$e],$z);

			} while($d==1);

			$e = $this->primes[$e];

			// Turn the string into an array of numbers < 255

			$m = $addr;

			$emailLength = strlen($m);

			$justEmail = "";

			$sep = ( strstr('?', $m) ) ? '&' : '?';

			if($subj != "") {

				$m = $m . "{$sep}subject=" . $subj;

			}

			$sep = ( strstr($m, '?') ) ? '&' : '?';

			if($body != "") {

				$m = $m . "{$sep}body=" . $body;

			}

			$length = strlen($m);

			$theString = $this->MakeArray($length);

			for($i = 0; $i < $length; $i++) {

				$theString[$i] = $this->charCodeAt($m, $i);

			}

			// Encrypt each of the numbers

			$theCode = $this->MakeArray($length);

			$c = "";

			$temp = 0;

			for($i = 0; $i < $length; $i++) {

				if($i != 0)

					$c .= " ";

				$temp = $this->myMod($theString[$i],$e,$n);

				$theCode[$i] = $temp;

				$c .= $temp;

				if($i == $emailLength - 1)

					$justEmail = $c;

			}

		}

		return Array('X'=>$justEmail, 'N'=>$n, 'D'=>$d, 'E'=>$e, 'C'=>$c, 'M'=>$m);

	}

	// Finds x^e % y for large values of (x^e)

	function myMod($x,$e,$y) {

		if ($e % 2 == 0) {

			$answer = 1;

			for($i = 1; $i <= e/2; $i++) {

				$temp = ($x*$x) % $y;

				$answer = ($temp*$answer) % $y;

			}

		} else {

			$answer = $x;

			for($i = 1; $i <= $e/2; $i++) {

				$temp = ($x*$x) % $y;

				$answer = ($temp*$answer) % $y;

			}

		}

		return $answer;

	}

	function getKey($e,$z) {

		$A = 1;

		$B = 0;

		$C = $z;

		$F = 0;

		$G = 1;

		$bar = $e;    

		// Euclid's Algorithm:

		while ($bar != 0) {

			$foo = floor($C/$bar);

			$K = $A - $foo * $F;

			$L = $B - $foo * $G;

			$M = $C - $foo * $bar;

			$A = $F;

			$B = $G;