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<?php
/**
* Copyright 1997-2017 Horde LLC (http://www.horde.org/)
* Copyright (c) 2002-2007, Richard Heyes
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* o Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* o Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* o The names of the authors may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* @category Horde
* @copyright 1997-2017 Horde LLC (http://www.horde.org/)
* @copyright 2002-2007 Richard Heyes
* @license http://www.horde.org/licenses/bsd New BSD License
* @package Mail
*/
/**
* Mail transport base class.
*
* @author Chuck Hagenbuch <chuck@horde.org>
* @author Richard Heyes <richard@phpguru.org>
* @author Michael Slusarz <slusarz@horde.org>
* @category Horde
* @copyright 1997-2017 Horde LLC (http://www.horde.org/)
* @copyright 2002-2007 Richard Heyes
* @license http://www.horde.org/licenses/bsd New BSD License
* @package Mail
*
* @property-read boolean $eai Does the transport driver support EAI (RFC
* 6532) headers? (@since 2.5.0)
*/
abstract class Horde_Mail_Transport
{
/**
* Line terminator used for separating header lines.
*
* @var string
*/
public $sep = PHP_EOL;
/**
* Configuration parameters.
*
* @var array
*/
protected $_params = array();
/**
*/
public function __get($name)
{
switch ($name) {
case 'eai':
return false;
}
}
/**
* Send a message.
*
* @param mixed $recipients Either a comma-seperated list of recipients
* (RFC822 compliant), or an array of
* recipients, each RFC822 valid. This may
* contain recipients not specified in the
* headers, for Bcc:, resending messages, etc.
* @param array $headers The headers to send with the mail, in an
* associative array, where the array key is the
* header name (ie, 'Subject'), and the array
* value is the header value (ie, 'test'). The
* header produced from those values would be
* 'Subject: test'.
* If the '_raw' key exists, the value of this
* key will be used as the exact text for
* sending the message.
* @param mixed $body The full text of the message body, including
* any Mime parts, etc. Either a string or a
* stream resource.
*
* @throws Horde_Mail_Exception
*/
abstract public function send($recipients, array $headers, $body);
/**
* Take an array of mail headers and return a string containing text
* usable in sending a message.
*
* @param array $headers The array of headers to prepare, in an
* associative array, where the array key is the
* header name (ie, 'Subject'), and the array value
* is the header value (ie, 'test'). The header
* produced from those values would be 'Subject:
* test'.
* If the '_raw' key exists, the value of this key
* will be used as the exact text for sending the
* message.
*
* @return mixed Returns false if it encounters a bad address; otherwise
* returns an array containing two elements: Any From:
* address found in the headers, and the plain text version
* of the headers.
* @throws Horde_Mail_Exception
*/
public function prepareHeaders(array $headers)
{
$from = null;
$lines = array();
$raw = isset($headers['_raw'])
? $headers['_raw']
: null;
foreach ($headers as $key => $value) {
if (strcasecmp($key, 'From') === 0) {
$parser = new Horde_Mail_Rfc822();
$addresses = $parser->parseAddressList($value, array(
'validate' => $this->eai ? 'eai' : true
));
$from = $addresses[0]->bare_address;
// Reject envelope From: addresses with spaces.
if (strstr($from, ' ')) {
return false;
}
$lines[] = $key . ': ' . $this->_normalizeEOL($value);
} elseif (!$raw && (strcasecmp($key, 'Received') === 0)) {
$received = array();
if (!is_array($value)) {
$value = array($value);
}
foreach ($value as $line) {
$received[] = $key . ': ' . $this->_normalizeEOL($line);
}
// Put Received: headers at the top. Spam detectors often
// flag messages with Received: headers after the Subject:
// as spam.
$lines = array_merge($received, $lines);
} elseif (!$raw) {
// If $value is an array (i.e., a list of addresses), convert
// it to a comma-delimited string of its elements (addresses).
if (is_array($value)) {
$value = implode(', ', $value);
}
$lines[] = $key . ': ' . $this->_normalizeEOL($value);
}
}
return array($from, $raw ? $raw : implode($this->sep, $lines));
}
/**
* Take a set of recipients and parse them, returning an array of bare
* addresses (forward paths) that can be passed to sendmail or an SMTP
* server with the 'RCPT TO:' command.
*
* @param mixed $recipients Either a comma-separated list of recipients
* (RFC822 compliant), or an array of
* recipients, each RFC822 valid.
*
* @return array Forward paths (bare addresses, IDN encoded).
* @throws Horde_Mail_Exception
*/
public function parseRecipients($recipients)
{
// Parse recipients, leaving out all personal info. This is
// for smtp recipients, etc. All relevant personal information
// should already be in the headers.
$rfc822 = new Horde_Mail_Rfc822();
return $rfc822->parseAddressList($recipients, array(
'validate' => $this->eai ? 'eai' : true
))->bare_addresses_idn;
}
/**
* Sanitize an array of mail headers by removing any additional header
* strings present in a legitimate header's value. The goal of this
* filter is to prevent mail injection attacks.
*
* Raw headers are sent as-is.
*
* @param array $headers The associative array of headers to sanitize.
*
* @return array The sanitized headers.
*/
protected function _sanitizeHeaders($headers)
{
foreach (array_diff(array_keys($headers), array('_raw')) as $key) {
$headers[$key] = preg_replace('=((<CR>|<LF>|0x0A/%0A|0x0D/%0D|\\n|\\r)\S).*=i', null, $headers[$key]);
}
return $headers;
}
/**
* Normalizes EOLs in string data.
*
* @param string $data Data.
*
* @return string Normalized data.
*/
protected function _normalizeEOL($data)
{
return strtr($data, array(
"\r\n" => $this->sep,
"\r" => $this->sep,
"\n" => $this->sep
));
}
/**
* Get the from address.
*
* @param string $from From address.
* @param array $headers Headers array.
*
* @return string Address object.
* @throws Horde_Mail_Exception
*/
protected function _getFrom($from, $headers)
{
/* Since few MTAs are going to allow this header to be forged unless
* it's in the MAIL FROM: exchange, we'll use Return-Path instead of
* From: if it's set. */
foreach (array_keys($headers) as $hdr) {
if (strcasecmp($hdr, 'Return-Path') === 0) {
$from = $headers[$hdr];
break;
}
}
if (!strlen($from)) {
throw new Horde_Mail_Exception('No from address provided.');
}
$from = new Horde_Mail_Rfc822_Address($from);
return $from->bare_address_idn;
}
}