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<?php
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// +-----------------------------------------------------------------------+
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// | Copyright (c) 2002-2003  Richard Heyes                                     |
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// | All rights reserved.                                                  |
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// |                                                                       |
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// | Redistribution and use in source and binary forms, with or without    |
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// | modification, are permitted provided that the following conditions    |
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// | are met:                                                              |
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// |                                                                       |
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// | o Redistributions of source code must retain the above copyright      |
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// |   notice, this list of conditions and the following disclaimer.       |
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// | o Redistributions in binary form must reproduce the above copyright   |
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// |   notice, this list of conditions and the following disclaimer in the |
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// |   documentation and/or other materials provided with the distribution.|
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// | o The names of the authors may not be used to endorse or promote      |
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// |   products derived from this software without specific prior written  |
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// |   permission.                                                         |
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// |                                                                       |
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// | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS   |
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// | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT     |
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// | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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// | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT  |
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// | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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// | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT      |
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// | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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// | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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// | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT   |
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// | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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// | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.  |
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// |                                                                       |
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// +-----------------------------------------------------------------------+
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// | Author: Richard Heyes <richard@phpguru.org>                           |
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// +-----------------------------------------------------------------------+
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/**
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*
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*  Raw mime encoding class
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*
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* What is it?
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*   This class enables you to manipulate and build
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*   a mime email from the ground up.
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*
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* Why use this instead of mime.php?
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*   mime.php is a userfriendly api to this class for
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*   people who aren't interested in the internals of
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*   mime mail. This class however allows full control
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*   over the email.
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*
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* Eg.
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*
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* // Since multipart/mixed has no real body, (the body is
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* // the subpart), we set the body argument to blank.
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*
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* $params['content_type'] = 'multipart/mixed';
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* $email = new Mail_mimePart('', $params);
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*
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* // Here we add a text part to the multipart we have
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* // already. Assume $body contains plain text.
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*
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* $params['content_type'] = 'text/plain';
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* $params['encoding']     = '7bit';
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* $text = $email->addSubPart($body, $params);
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*
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* // Now add an attachment. Assume $attach is
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* the contents of the attachment
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*
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* $params['content_type'] = 'application/zip';
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* $params['encoding']     = 'base64';
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* $params['disposition']  = 'attachment';
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* $params['dfilename']    = 'example.zip';
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* $attach =& $email->addSubPart($body, $params);
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*
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* // Now build the email. Note that the encode
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* // function returns an associative array containing two
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* // elements, body and headers. You will need to add extra
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* // headers, (eg. Mime-Version) before sending.
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*
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* $email = $message->encode();
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* $email['headers'][] = 'Mime-Version: 1.0';
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*
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*
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* Further examples are available at http://www.phpguru.org
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*
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* TODO:
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*  - Set encode() to return the $obj->encoded if encode()
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*    has already been run. Unless a flag is passed to specifically
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*    re-build the message.
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*
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* @author  Richard Heyes <richard@phpguru.org>
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* @version $Revision: 1.1 $
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* @package Mail
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*/
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class Mail_mimePart {
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   /**
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    * The encoding type of this part
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    * @var string
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    */
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    var $_encoding;
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   /**
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    * An array of subparts
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    * @var array
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    */
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    var $_subparts;
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   /**
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    * The output of this part after being built
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    * @var string
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    */
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    var $_encoded;
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   /**
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    * Headers for this part
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    * @var array
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    */
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    var $_headers;
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   /**
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    * The body of this part (not encoded)
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    * @var string
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    */
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    var $_body;
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    /**
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     * Constructor.
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     *
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     * Sets up the object.
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     *
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     * @param $body   - The body of the mime part if any.
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     * @param $params - An associative array of parameters:
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     *                  content_type - The content type for this part eg multipart/mixed
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     *                  encoding     - The encoding to use, 7bit, 8bit, base64, or quoted-printable
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     *                  cid          - Content ID to apply
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     *                  disposition  - Content disposition, inline or attachment
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     *                  dfilename    - Optional filename parameter for content disposition
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     *                  description  - Content description
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     *                  charset      - Character set to use
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     * @access public
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     */
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    function Mail_mimePart($body = '', $params = array())
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    {
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        if (!defined('MAIL_MIMEPART_CRLF')) {
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            define('MAIL_MIMEPART_CRLF', defined('MAIL_MIME_CRLF') ? MAIL_MIME_CRLF : "\r\n", TRUE);
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        }
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        foreach ($params as $key => $value) {
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            switch ($key) {
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                case 'content_type':
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                    $headers['Content-Type'] = $value . (isset($charset) ? '; charset="' . $charset . '"' : '');
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                    break;
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                case 'encoding':
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                    $this->_encoding = $value;
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                    $headers['Content-Transfer-Encoding'] = $value;
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                    break;
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                case 'cid':
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                    $headers['Content-ID'] = '<' . $value . '>';
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                    break;
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                case 'disposition':
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                    $headers['Content-Disposition'] = $value . (isset($dfilename) ? '; filename="' . $dfilename . '"' : '');
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                    break;
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                case 'dfilename':
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                    if (isset($headers['Content-Disposition'])) {
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                        $headers['Content-Disposition'] .= '; filename="' . $value . '"';
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                    } else {
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                        $dfilename = $value;
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                    }
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                    break;
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                case 'description':
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                    $headers['Content-Description'] = $value;
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                    break;
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                case 'charset':
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                    if (isset($headers['Content-Type'])) {
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                        $headers['Content-Type'] .= '; charset="' . $value . '"';
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                    } else {
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                        $charset = $value;
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                    }
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                    break;
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            }
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        }
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        // Default content-type
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        if (!isset($headers['Content-Type'])) {
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            $headers['Content-Type'] = 'text/plain';
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        }
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        //Default encoding
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        if (!isset($this->_encoding)) {
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            $this->_encoding = '7bit';
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        }
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        // Assign stuff to member variables
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        $this->_encoded  = array();
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        $this->_headers  = $headers;
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        $this->_body     = $body;
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    }
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    /**
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     * encode()
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     *
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     * Encodes and returns the email. Also stores
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     * it in the encoded member variable
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     *
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     * @return An associative array containing two elements,
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     *         body and headers. The headers element is itself
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     *         an indexed array.
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     * @access public
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     */
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    function encode()
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    {
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        $encoded =& $this->_encoded;
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        if (!empty($this->_subparts)) {
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            srand((double)microtime()*1000000);
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            $boundary = '=_' . md5(rand() . microtime());
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            $this->_headers['Content-Type'] .= ';' . MAIL_MIMEPART_CRLF . "\t" . 'boundary="' . $boundary . '"';
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            // Add body parts to $subparts
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            for ($i = 0; $i < count($this->_subparts); $i++) {
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                $headers = array();
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                $tmp = $this->_subparts[$i]->encode();
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                foreach ($tmp['headers'] as $key => $value) {
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                    $headers[] = $key . ': ' . $value;
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                }
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                $subparts[] = implode(MAIL_MIMEPART_CRLF, $headers) . MAIL_MIMEPART_CRLF . MAIL_MIMEPART_CRLF . $tmp['body'];
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            }
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            $encoded['body'] = '--' . $boundary . MAIL_MIMEPART_CRLF .
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                               implode('--' . $boundary . MAIL_MIMEPART_CRLF, $subparts) .
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                               '--' . $boundary.'--' . MAIL_MIMEPART_CRLF;
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        } else {
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            $encoded['body'] = $this->_getEncodedData($this->_body, $this->_encoding) . MAIL_MIMEPART_CRLF;
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        }
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        // Add headers to $encoded
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        $encoded['headers'] =& $this->_headers;
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        return $encoded;
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    }
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    /**
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     * &addSubPart()
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     *
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     * Adds a subpart to current mime part and returns
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     * a reference to it
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     *
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     * @param $body   The body of the subpart, if any.
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     * @param $params The parameters for the subpart, same
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     *                as the $params argument for constructor.
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     * @return A reference to the part you just added. It is
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     *         crucial if using multipart/* in your subparts that
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     *         you use =& in your script when calling this function,
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     *         otherwise you will not be able to add further subparts.
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     * @access public
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     */
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    function &addSubPart($body, $params)
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    {
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        $this->_subparts[] = new Mail_mimePart($body, $params);
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        return $this->_subparts[count($this->_subparts) - 1];
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    }
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    /**
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     * _getEncodedData()
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     *
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     * Returns encoded data based upon encoding passed to it
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     *
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     * @param $data     The data to encode.
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     * @param $encoding The encoding type to use, 7bit, base64,
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     *                  or quoted-printable.
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     * @access private
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     */
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    function _getEncodedData($data, $encoding)
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    {
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        switch ($encoding) {
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            case '8bit':
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            case '7bit':
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                return $data;
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                break;
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            case 'quoted-printable':
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                return $this->_quotedPrintableEncode($data);
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                break;
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            case 'base64':
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                return rtrim(chunk_split(base64_encode($data), 76, MAIL_MIMEPART_CRLF));
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                break;
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            default:
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                return $data;
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        }
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    }
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    /**
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     * quoteadPrintableEncode()
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     *
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     * Encodes data to quoted-printable standard.
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     *
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     * @param $input    The data to encode
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     * @param $line_max Optional max line length. Should
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     *                  not be more than 76 chars
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     *
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     * @access private
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     */
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    function _quotedPrintableEncode($input , $line_max = 76)
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    {
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        $lines  = preg_split("/\r?\n/", $input);
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        $eol    = MAIL_MIMEPART_CRLF;
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        $escape = '=';
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        $output = '';
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319
        while(list(, $line) = each($lines)){
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            $linlen     = strlen($line);
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            $newline = '';
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            for ($i = 0; $i < $linlen; $i++) {
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                $char = substr($line, $i, 1);
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                $dec  = ord($char);
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328
                if (($dec == 32) AND ($i == ($linlen - 1))){    // convert space at eol only
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                    $char = '=20';
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                } elseif(($dec == 9) AND ($i == ($linlen - 1))) {  // convert tab at eol only
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                    $char = '=09';
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                } elseif($dec == 9) {
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                    ; // Do nothing if a tab.
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                } elseif(($dec == 61) OR ($dec < 32 ) OR ($dec > 126)) {
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                    $char = $escape . strtoupper(sprintf('%02s', dechex($dec)));
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                }
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                if ((strlen($newline) + strlen($char)) >= $line_max) {        // MAIL_MIMEPART_CRLF is not counted
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                    $output  .= $newline . $escape . $eol;                    // soft line break; " =\r\n" is okay
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                    $newline  = '';
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                }
343
                $newline .= $char;
344
            } // end of for
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            $output .= $newline . $eol;
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        }
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        $output = substr($output, 0, -1 * strlen($eol)); // Don't want last crlf
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        return $output;
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    }
350
} // End of class
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?>