1120 lines
42 KiB
PHP
1120 lines
42 KiB
PHP
<?php
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/** mime.php
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**
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** This contains the functions necessary to detect and decode MIME
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** messages.
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**
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** $Id$
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**/
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if (defined('mime_php'))
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return;
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define('mime_php', true);
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require_once('../functions/imap.php');
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/** Setting up the objects that have the structure for the message **/
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class msg_header {
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/** msg_header contains generic variables for values that **/
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/** could be in a header. **/
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var $type0 = '', $type1 = '', $boundary = '', $charset = '';
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var $encoding = '', $size = 0, $to = array(), $from = '', $date = '';
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var $cc = array(), $bcc = array(), $reply_to = '', $subject = '';
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var $id = 0, $mailbox = '', $description = '', $filename = '';
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var $entity_id = 0, $message_id = 0, $name = '';
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}
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class message {
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/** message is the object that contains messages. It is a recursive
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object in that through the $entities variable, it can contain
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more objects of type message. See documentation in mime.txt for
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a better description of how this works.
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**/
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var $header = '';
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var $entities = array();
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function addEntity ($msg) {
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$this->entities[] = $msg;
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}
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}
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/* --------------------------------------------------------------------------------- */
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/* MIME DECODING */
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/* --------------------------------------------------------------------------------- */
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// This function gets the structure of a message and stores it in the "message" class.
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// It will return this object for use with all relevant header information and
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// fully parsed into the standard "message" object format.
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function mime_structure ($imap_stream, $header) {
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sqimap_messages_flag ($imap_stream, $header->id, $header->id, 'Seen');
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$ssid = sqimap_session_id();
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$lsid = strlen( $ssid );
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$id = $header->id;
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fputs ($imap_stream, "$ssid FETCH $id BODYSTRUCTURE\r\n");
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//
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// This should use sqimap_read_data instead of reading it itself
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//
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$read = fgets ($imap_stream, 10000);
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$bodystructure = '';
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while( substr($read, 0, $lsid) <> $ssid &&
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!feof( $imap_stream ) ) {
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$bodystructure .= $read;
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$read = fgets ($imap_stream, 10000);
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}
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$read = $bodystructure;
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// isolate the body structure and remove beginning and end parenthesis
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$read = trim(substr ($read, strpos(strtolower($read), 'bodystructure') + 13));
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$read = trim(substr ($read, 0, -1));
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$end = mime_match_parenthesis(0, $read);
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while ($end == strlen($read)-1) {
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$read = trim(substr ($read, 0, -1));
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$read = trim(substr ($read, 1));
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$end = mime_match_parenthesis(0, $read);
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}
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$msg = mime_parse_structure ($read, 0);
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$msg->header = $header;
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return $msg;
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}
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// this starts the parsing of a particular structure. It is called recursively,
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// so it can be passed different structures. It returns an object of type
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// $message.
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// First, it checks to see if it is a multipart message. If it is, then it
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// handles that as it sees is necessary. If it is just a regular entity,
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// then it parses it and adds the necessary header information (by calling out
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// to mime_get_elements()
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function mime_parse_structure ($structure, $ent_id) {
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$msg = new message();
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if ($structure{0} == '(') {
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$ent_id = mime_new_element_level($ent_id);
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$start = $end = -1;
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do {
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$start = $end+1;
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$end = mime_match_parenthesis ($start, $structure);
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$element = substr($structure, $start+1, ($end - $start)-1);
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$ent_id = mime_increment_id ($ent_id);
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$newmsg = mime_parse_structure ($element, $ent_id);
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$msg->addEntity ($newmsg);
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} while ($structure{$end+1} == '(');
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} else {
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// parse the elements
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$msg = mime_get_element ($structure, $msg, $ent_id);
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}
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return $msg;
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}
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// Increments the element ID. An element id can look like any of
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// the following: 1, 1.2, 4.3.2.4.1, etc. This function increments
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// the last number of the element id, changing 1.2 to 1.3.
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function mime_increment_id ($id) {
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if (strpos($id, ".")) {
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$first = substr($id, 0, strrpos($id, "."));
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$last = substr($id, strrpos($id, ".")+1);
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$last++;
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$new = $first . "." .$last;
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} else {
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$new = $id + 1;
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}
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return $new;
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}
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// See comment for mime_increment_id().
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// This adds another level on to the entity_id changing 1.3 to 1.3.0
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// NOTE: 1.3.0 is not a valid element ID. It MUST be incremented
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// before it can be used. I left it this way so as not to have
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// to make a special case if it is the first entity_id. It
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// always increments it, and that works fine.
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function mime_new_element_level ($id) {
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if (!$id) {
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$id = 0;
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} else {
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$id = $id . '.0';
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}
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return( $id );
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}
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function mime_get_element (&$structure, $msg, $ent_id) {
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$elem_num = 1;
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$msg->header = new msg_header();
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$msg->header->entity_id = $ent_id;
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$properties = array();
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while (strlen($structure) > 0) {
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$structure = trim($structure);
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$char = $structure{0};
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if (strtolower(substr($structure, 0, 3)) == 'nil') {
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$text = '';
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$structure = substr($structure, 3);
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} else if ($char == '"') {
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// loop through until we find the matching quote, and return that as a string
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$pos = 1;
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$text = '';
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while ( ($char = $structure{$pos} ) <> '"' && $pos < strlen($structure)) {
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$text .= $char;
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$pos++;
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}
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$structure = substr($structure, strlen($text) + 2);
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} else if ($char == '(') {
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// comment me
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$end = mime_match_parenthesis (0, $structure);
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$sub = substr($structure, 1, $end-1);
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$properties = mime_get_props($properties, $sub);
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$structure = substr($structure, strlen($sub) + 2);
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} else {
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// loop through until we find a space or an end parenthesis
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$pos = 0;
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$char = $structure{$pos};
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$text = '';
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while ($char != ' ' && $char != ')' && $pos < strlen($structure)) {
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$text .= $char;
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$pos++;
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$char = $structure{$pos};
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}
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$structure = substr($structure, strlen($text));
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}
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// This is where all the text parts get put into the header
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switch ($elem_num) {
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case 1:
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$msg->header->type0 = strtolower($text);
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break;
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case 2:
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$msg->header->type1 = strtolower($text);
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break;
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case 4: // Id
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// Invisimail enclose images with <>
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$msg->header->id = str_replace( '<', '', str_replace( '>', '', $text ) );
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break;
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case 5:
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$msg->header->description = $text;
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break;
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case 6:
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$msg->header->encoding = strtolower($text);
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break;
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case 7:
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$msg->header->size = $text;
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break;
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default:
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if ($msg->header->type0 == 'text' && $elem_num == 8) {
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// This is a plain text message, so lets get the number of lines
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// that it contains.
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$msg->header->num_lines = $text;
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} else if ($msg->header->type0 == 'message' && $msg->header->type1 == 'rfc822' && $elem_num == 8) {
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// This is an encapsulated message, so lets start all over again and
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// parse this message adding it on to the existing one.
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$structure = trim($structure);
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if ( $structure{0} == '(' ) {
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$e = mime_match_parenthesis (0, $structure);
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$structure = substr($structure, 0, $e);
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$structure = substr($structure, 1);
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$m = mime_parse_structure($structure, $msg->header->entity_id);
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// the following conditional is there to correct a bug that wasn't
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// incrementing the entity IDs correctly because of the special case
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// that message/rfc822 is. This fixes it fine.
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if (substr($structure, 1, 1) != '(')
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$m->header->entity_id = mime_increment_id(mime_new_element_level($ent_id));
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// Now we'll go through and reformat the results.
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if ($m->entities) {
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for ($i=0; $i < count($m->entities); $i++) {
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$msg->addEntity($m->entities[$i]);
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}
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} else {
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$msg->addEntity($m);
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}
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$structure = "";
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}
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}
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break;
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}
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$elem_num++;
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$text = "";
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}
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// loop through the additional properties and put those in the various headers
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if ($msg->header->type0 != 'message') {
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for ($i=0; $i < count($properties); $i++) {
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$msg->header->{$properties[$i]['name']} = $properties[$i]['value'];
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}
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}
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return $msg;
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}
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// I did most of the MIME stuff yesterday (June 20, 2000), but I couldn't
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// figure out how to do this part, so I decided to go to bed. I woke up
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// in the morning and had a flash of insight. I went to the white-board
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// and scribbled it out, then spent a bit programming it, and this is the
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// result. Nothing complicated, but I think my brain was fried yesterday.
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// Funny how that happens some times.
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//
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// This gets properties in a nested parenthesisized list. For example,
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// this would get passed something like: ("attachment" ("filename" "luke.tar.gz"))
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// This returns an array called $props with all paired up properties.
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// It ignores the "attachment" for now, maybe that should change later
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// down the road. In this case, what is returned is:
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// $props[0]["name"] = "filename";
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// $props[0]["value"] = "luke.tar.gz";
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function mime_get_props ($props, $structure) {
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while (strlen($structure) > 0) {
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$structure = trim($structure);
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$char = $structure{0};
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if ($char == '"') {
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$pos = 1;
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$tmp = '';
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while ( ( $char = $structure{$pos} ) != '"' &&
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$pos < strlen($structure)) {
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$tmp .= $char;
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$pos++;
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}
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$structure = trim(substr($structure, strlen($tmp) + 2));
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$char = $structure{0};
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if ($char == '"') {
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$pos = 1;
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$value = '';
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while ( ( $char = $structure{$pos} ) != '"' &&
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$pos < strlen($structure) ) {
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$value .= $char;
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$pos++;
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}
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$structure = trim(substr($structure, strlen($tmp) + 2));
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$k = count($props);
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$props[$k]['name'] = strtolower($tmp);
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$props[$k]['value'] = $value;
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} else if ($char == '(') {
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$end = mime_match_parenthesis (0, $structure);
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$sub = substr($structure, 1, $end-1);
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if (! isset($props))
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$props = array();
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$props = mime_get_props($props, $sub);
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$structure = substr($structure, strlen($sub) + 2);
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}
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return $props;
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} else if ($char == '(') {
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$end = mime_match_parenthesis (0, $structure);
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$sub = substr($structure, 1, $end-1);
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$props = mime_get_props($props, $sub);
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$structure = substr($structure, strlen($sub) + 2);
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return $props;
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} else {
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return $props;
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}
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}
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}
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// Matches parenthesis. It will return the position of the matching
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// parenthesis in $structure. For instance, if $structure was:
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// ("text" "plain" ("val1name", "1") nil ... )
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// x x
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// then this would return 42 to match up those two.
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function mime_match_parenthesis ($pos, $structure) {
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$j = strlen( $structure );
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// ignore all extra characters
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// If inside of a string, skip string -- Boundary IDs and other
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// things can have ) in them.
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if( $structure{$pos} != '(' )
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return( $j );
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while( $pos < $j ) {
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$pos++;
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if ($structure{$pos} == ')') {
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return $pos;
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} elseif ($structure{$pos} == '"') {
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$pos++;
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while( $structure{$pos} != '"' &&
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$pos < $j ) {
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if (substr($structure, $pos, 2) == '\\"')
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$pos++;
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elseif (substr($structure, $pos, 2) == '\\\\')
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$pos++;
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$pos++;
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}
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} elseif ( $structure{$pos} == '(' ) {
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$pos = mime_match_parenthesis ($pos, $structure);
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}
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}
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echo "Error decoding mime structure. Report this as a bug!<br>\n";
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return( $pos );
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}
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function mime_fetch_body ($imap_stream, $id, $ent_id ) {
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// do a bit of error correction. If we couldn't find the entity id, just guess
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// that it is the first one. That is usually the case anyway.
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if (!$ent_id)
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$ent_id = 1;
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$sid = sqimap_session_id();
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fputs ($imap_stream, "$sid FETCH $id BODY[$ent_id]\r\n");
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$data = sqimap_read_data ($imap_stream, $sid, true, $response, $message);
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$topline = array_shift($data);
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while (! ereg('\\* [0-9]+ FETCH ', $topline) && $data)
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$topline = array_shift($data);
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$wholemessage = implode('', $data);
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if (ereg('\\{([^\\}]*)\\}', $topline, $regs)) {
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$ret = substr( $wholemessage, 0, $regs[1] );
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/*
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There is some information in the content info header that could be important
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in order to parse html messages. Let's get them here.
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*/
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if( $ret{0} == '<' ) {
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fputs ($imap_stream, "$sid FETCH $id BODY[$ent_id.MIME]\r\n");
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$data = sqimap_read_data ($imap_stream, $sid, true, $response, $message);
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$base = '';
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$k = 10;
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foreach( $data as $d ) {
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if( substr( $d, 0, 13 ) == 'Content-Base:' ) {
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$j = strlen( $d );
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$i = 13;
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$base = '';
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while( $i < $j &&
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( !isNoSep( $d{$i} ) || $d{$i} == '"' ) )
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$i++;
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while( $i < $j ) {
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if( isNoSep( $d{$i} ) )
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$base .= $d{$i};
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$i++;
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}
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$k = 0;
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} elseif( $k == 1 && !isnosep( $d{0} ) ) {
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$base .= substr( $d, 1 );
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}
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$k++;
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}
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if( $base <> '' )
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$ret = "<base href=\"$base\">" . $ret;
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}
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} else if (ereg('"([^"]*)"', $topline, $regs)) {
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$ret = $regs[1];
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} else {
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$ret = "Body retrieval error. Please report this bug!\n" .
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"Response: $response\n" .
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"Message: $message\n" .
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"FETCH line: $topline" .
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"---------------\n$wholemessage";
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foreach ($data as $d) {
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$ret .= htmlspecialchars($d) . "\n";
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}
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}
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return( $ret );
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}
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function mime_print_body_lines ($imap_stream, $id, $ent_id, $encoding) {
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// do a bit of error correction. If we couldn't find the entity id, just guess
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// that it is the first one. That is usually the case anyway.
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if (!$ent_id) $ent_id = 1;
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$sid = sqimap_session_id();
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// Don't kill the connection if the browser is over a dialup
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// and it would take over 30 seconds to download it.
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set_time_limit(0);
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fputs ($imap_stream, "$sid FETCH $id BODY[$ent_id]\r\n");
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$cnt = 0;
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$continue = true;
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$read = fgets ($imap_stream,4096);
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// This could be bad -- if the section has sqimap_session_id() . ' OK'
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// or similar, it will kill the download.
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while (!ereg("^".$sid." (OK|BAD|NO)(.*)$", $read, $regs)) {
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if (trim($read) == ')==') {
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$read1 = $read;
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$read = fgets ($imap_stream,4096);
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if (ereg("^".$sid." (OK|BAD|NO)(.*)$", $read, $regs)) {
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return;
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} else {
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echo decodeBody($read1, $encoding) .
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decodeBody($read, $encoding);
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}
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} else if ($cnt) {
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echo decodeBody($read, $encoding);
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}
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$read = fgets ($imap_stream,4096);
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$cnt++;
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}
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}
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|
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/* -[ END MIME DECODING ]----------------------------------------------------------- */
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|
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/** This is the first function called. It decides if this is a multipart
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message or if it should be handled as a single entity
|
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**/
|
|
function decodeMime ($imap_stream, &$header) {
|
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global $username, $key, $imapServerAddress, $imapPort;
|
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return mime_structure ($imap_stream, $header);
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}
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|
|
// This is here for debugging purposese. It will print out a list
|
|
// of all the entity IDs that are in the $message object.
|
|
/*
|
|
function listEntities ($message) {
|
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if ($message) {
|
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if ($message->header->entity_id)
|
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echo "<tt>" . $message->header->entity_id . ' : ' . $message->header->type0 . '/' . $message->header->type1 . '<br>';
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for ($i = 0; $message->entities[$i]; $i++) {
|
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$msg = listEntities($message->entities[$i], $ent_id);
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if ($msg)
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return $msg;
|
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}
|
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}
|
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}
|
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*/
|
|
|
|
// returns a $message object for a particular entity id
|
|
function getEntity ($message, $ent_id) {
|
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if ($message) {
|
|
if ($message->header->entity_id == $ent_id && strlen($ent_id) == strlen($message->header->entity_id)) {
|
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return $message;
|
|
} else {
|
|
for ($i = 0; isset($message->entities[$i]); $i++) {
|
|
$msg = getEntity ($message->entities[$i], $ent_id);
|
|
if ($msg)
|
|
return $msg;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// figures out what entity to display and returns the $message object
|
|
// for that entity.
|
|
function findDisplayEntity ($message, $textOnly = 1) {
|
|
global $show_html_default;
|
|
|
|
$entity = 0;
|
|
|
|
if ($message) {
|
|
if ( $message->header->type0 == 'multipart' &&
|
|
( $message->header->type1 == 'alternative' ||
|
|
$message->header->type1 == 'related' ) &&
|
|
$show_html_default && ! $textOnly ) {
|
|
$entity = findDisplayEntityHTML($message);
|
|
}
|
|
|
|
// Show text/plain or text/html -- the first one we find.
|
|
if ( $entity == 0 &&
|
|
$message->header->type0 == 'text' &&
|
|
( $message->header->type1 == 'plain' ||
|
|
$message->header->type1 == 'html' ) &&
|
|
isset($message->header->entity_id) ) {
|
|
$entity = $message->header->entity_id;
|
|
}
|
|
|
|
$i = 0;
|
|
while ($entity == 0 && isset($message->entities[$i]) ) {
|
|
$entity = findDisplayEntity($message->entities[$i], $textOnly);
|
|
$i++;
|
|
}
|
|
}
|
|
|
|
return( $entity );
|
|
}
|
|
|
|
// Shows the HTML version
|
|
function findDisplayEntityHTML ($message) {
|
|
if ($message->header->type0 == 'text' &&
|
|
$message->header->type1 == 'html' &&
|
|
isset($message->header->entity_id))
|
|
return $message->header->entity_id;
|
|
for ($i = 0; isset($message->entities[$i]); $i ++) {
|
|
$entity = findDisplayEntityHTML($message->entities[$i]);
|
|
if ($entity != 0)
|
|
return $entity;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/** This returns a parsed string called $body. That string can then
|
|
be displayed as the actual message in the HTML. It contains
|
|
everything needed, including HTML Tags, Attachments at the
|
|
bottom, etc.
|
|
**/
|
|
function formatBody($imap_stream, $message, $color, $wrap_at) {
|
|
// this if statement checks for the entity to show as the
|
|
// primary message. To add more of them, just put them in the
|
|
// order that is their priority.
|
|
global $startMessage, $username, $key, $imapServerAddress, $imapPort,
|
|
$show_html_default;
|
|
|
|
$id = $message->header->id;
|
|
$urlmailbox = urlencode($message->header->mailbox);
|
|
|
|
// Get the right entity and redefine message to be this entity
|
|
// Pass the 0 to mean that we want the 'best' viewable one
|
|
$ent_num = findDisplayEntity ($message, 0);
|
|
$body_message = getEntity($message, $ent_num);
|
|
if (($body_message->header->type0 == 'text') ||
|
|
($body_message->header->type0 == 'rfc822')) {
|
|
|
|
$body = mime_fetch_body ($imap_stream, $id, $ent_num);
|
|
$body = decodeBody($body, $body_message->header->encoding);
|
|
$hookResults = do_hook("message_body", $body);
|
|
$body = $hookResults[1];
|
|
|
|
// If there are other types that shouldn't be formatted, add
|
|
// them here
|
|
if ($body_message->header->type1 == 'html') {
|
|
if( $show_html_default <> 1 ) {
|
|
$body = strip_tags( $body );
|
|
translateText($body, $wrap_at, $body_message->header->charset);
|
|
} else {
|
|
$body = MagicHTML( $body, $id );
|
|
}
|
|
} else {
|
|
translateText($body, $wrap_at, $body_message->header->charset);
|
|
}
|
|
|
|
$body .= "<SMALL><CENTER><A HREF=\"../src/download.php?absolute_dl=true&passed_id=$id&passed_ent_id=$ent_num&mailbox=$urlmailbox&showHeaders=1\">". _("Download this as a file") ."</A></CENTER><BR></SMALL>";
|
|
|
|
/** Display the ATTACHMENTS: message if there's more than one part **/
|
|
$body .= "</TD></TR></TABLE>";
|
|
if (isset($message->entities[0])) {
|
|
$body .= formatAttachments ($message, $ent_num, $message->header->mailbox, $id);
|
|
}
|
|
$body .= "</TD></TR></TABLE>";
|
|
} else {
|
|
$body = formatAttachments ($message, -1, $message->header->mailbox, $id);
|
|
}
|
|
return( $body );
|
|
}
|
|
|
|
// A recursive function that returns a list of attachments with links
|
|
// to where to download these attachments
|
|
function formatAttachments ($message, $ent_id, $mailbox, $id) {
|
|
global $where, $what;
|
|
global $startMessage, $color;
|
|
static $ShownHTML = 0;
|
|
|
|
$body = "";
|
|
if ($ShownHTML == 0) {
|
|
$ShownHTML = 1;
|
|
|
|
$body .= "<TABLE WIDTH=100% CELLSPACING=0 CELLPADDING=2 BORDER=0 BGCOLOR=\"$color[0]\"><TR>\n" .
|
|
"<TH ALIGN=\"left\" BGCOLOR=\"$color[9]\"><B>\n" .
|
|
_("Attachments") . ':' .
|
|
"</B></TH></TR><TR><TD>\n" .
|
|
"<TABLE CELLSPACING=0 CELLPADDING=1 BORDER=0>\n" .
|
|
formatAttachments ($message, $ent_id, $mailbox, $id) .
|
|
"</TABLE></TD></TR></TABLE>";
|
|
|
|
return( $body );
|
|
}
|
|
|
|
if ($message) {
|
|
if (!$message->entities) {
|
|
$type0 = strtolower($message->header->type0);
|
|
$type1 = strtolower($message->header->type1);
|
|
$name = decodeHeader($message->header->name);
|
|
|
|
if ($message->header->entity_id != $ent_id) {
|
|
$filename = decodeHeader($message->header->filename);
|
|
if (trim($filename) == '') {
|
|
if (trim($name) == '') {
|
|
if( trim( $message->header->id ) == '' )
|
|
$display_filename = 'untitled-[' . $message->header->entity_id . ']' ;
|
|
else
|
|
$display_filename = 'cid: ' . $message->header->id;
|
|
// $display_filename = 'untitled-[' . $message->header->entity_id . ']' ;
|
|
} else {
|
|
$display_filename = $name;
|
|
$filename = $name;
|
|
}
|
|
} else {
|
|
$display_filename = $filename;
|
|
}
|
|
|
|
$urlMailbox = urlencode($mailbox);
|
|
$ent = urlencode($message->header->entity_id);
|
|
|
|
$DefaultLink =
|
|
"../src/download.php?startMessage=$startMessage&passed_id=$id&mailbox=$urlMailbox&passed_ent_id=$ent";
|
|
if ($where && $what)
|
|
$DefaultLink .= '&where=' . urlencode($where) . '&what=' . urlencode($what);
|
|
$Links['download link']['text'] = _("download");
|
|
$Links['download link']['href'] =
|
|
"../src/download.php?absolute_dl=true&passed_id=$id&mailbox=$urlMailbox&passed_ent_id=$ent";
|
|
$ImageURL = '';
|
|
|
|
$HookResults = do_hook("attachment $type0/$type1", $Links,
|
|
$startMessage, $id, $urlMailbox, $ent, $DefaultLink,
|
|
$display_filename, $where, $what);
|
|
|
|
$Links = $HookResults[1];
|
|
$DefaultLink = $HookResults[6];
|
|
|
|
$body .= '<TR><TD> </TD><TD>' .
|
|
"<A HREF=\"$DefaultLink\">$display_filename</A> </TD>" .
|
|
'<TD><SMALL><b>' . show_readable_size($message->header->size) .
|
|
'</b> </small></TD>' .
|
|
"<TD><SMALL>[ $type0/$type1 ] </SMALL></TD>" .
|
|
'<TD><SMALL>';
|
|
if ($message->header->description)
|
|
$body .= '<b>' . htmlspecialchars($message->header->description) . '</b>';
|
|
$body .= '</SMALL></TD><TD><SMALL> ';
|
|
|
|
|
|
$SkipSpaces = 1;
|
|
foreach ($Links as $Val) {
|
|
if ($SkipSpaces) {
|
|
$SkipSpaces = 0;
|
|
} else {
|
|
$body .= ' | ';
|
|
}
|
|
$body .= '<a href="' . $Val['href'] . '">' . $Val['text'] . '</a>';
|
|
}
|
|
|
|
unset($Links);
|
|
|
|
$body .= "</SMALL></TD></TR>\n";
|
|
}
|
|
} else {
|
|
for ($i = 0; $i < count($message->entities); $i++) {
|
|
$body .= formatAttachments ($message->entities[$i], $ent_id, $mailbox, $id);
|
|
}
|
|
}
|
|
return( $body );
|
|
}
|
|
}
|
|
|
|
|
|
/** this function decodes the body depending on the encoding type. **/
|
|
function decodeBody($body, $encoding) {
|
|
$body = str_replace("\r\n", "\n", $body);
|
|
$encoding = strtolower($encoding);
|
|
|
|
global $show_html_default;
|
|
|
|
if ($encoding == 'quoted-printable') {
|
|
$body = quoted_printable_decode($body);
|
|
|
|
|
|
/*
|
|
Following code has been comented as I see no reason for it.
|
|
If there is any please tell me a mingo@rotedic.com
|
|
|
|
while (ereg("=\n", $body))
|
|
$body = ereg_replace ("=\n", "", $body);
|
|
*/
|
|
} else if ($encoding == 'base64') {
|
|
$body = base64_decode($body);
|
|
}
|
|
|
|
// All other encodings are returned raw.
|
|
return $body;
|
|
}
|
|
|
|
|
|
// This functions decode strings that is encoded according to
|
|
// RFC1522 (MIME Part Two: Message Header Extensions for Non-ASCII Text).
|
|
function decodeHeader ($string) {
|
|
if (eregi('=\\?([^?]+)\\?(q|b)\\?([^?]+)\\?=',
|
|
$string, $res)) {
|
|
if (ucfirst($res[2]) == "B") {
|
|
$replace = base64_decode($res[3]);
|
|
} else {
|
|
$replace = ereg_replace("_", " ", $res[3]);
|
|
// Convert lowercase Quoted Printable to uppercase for
|
|
// quoted_printable_decode to understand it.
|
|
while (ereg("(=(([0-9][abcdef])|([abcdef][0-9])|([abcdef][abcdef])))", $replace, $res)) {
|
|
$replace = str_replace($res[1], strtoupper($res[1]), $replace);
|
|
}
|
|
$replace = quoted_printable_decode($replace);
|
|
}
|
|
|
|
$replace = charset_decode ($res[1], $replace);
|
|
|
|
// Remove the name of the character set.
|
|
$string = eregi_replace ('=\\?([^?]+)\\?(q|b)\\?([^?]+)\\?=',
|
|
$replace, $string);
|
|
|
|
// In case there should be more encoding in the string: recurse
|
|
return (decodeHeader($string));
|
|
} else
|
|
return ($string);
|
|
}
|
|
|
|
// Encode a string according to RFC 1522 for use in headers if it
|
|
// contains 8-bit characters or anything that looks like it should
|
|
// be encoded.
|
|
function encodeHeader ($string) {
|
|
global $default_charset;
|
|
|
|
// Encode only if the string contains 8-bit characters or =?
|
|
$j = strlen( $string );
|
|
$l = FALSE; // Must be encoded ?
|
|
$ret = '';
|
|
for( $i=0; $i < $j; ++$i) {
|
|
switch( $string{$i} ) {
|
|
case '=':
|
|
$ret .= '=3D';
|
|
break;
|
|
case '?':
|
|
$l = TRUE;
|
|
$ret .= '=3F';
|
|
break;
|
|
case '_':
|
|
$ret .= '=5F';
|
|
break;
|
|
case ' ':
|
|
$ret .= '_';
|
|
break;
|
|
default:
|
|
$k = ord( $string{$i} );
|
|
if( $k > 126 ) {
|
|
$ret .= sprintf("=%02X", $k);
|
|
$l = TRUE;
|
|
} else
|
|
$ret .= $string{$i};
|
|
}
|
|
}
|
|
|
|
if( $l )
|
|
$string = "=?$default_charset?Q?$ret?=";
|
|
|
|
return( $string );
|
|
}
|
|
|
|
/*
|
|
Strips dangerous tags from html messages.
|
|
*/
|
|
|
|
function MagicHTML( $body, $id ) {
|
|
|
|
global $message, $PHP_SELF, $HTTP_SERVER_VARS;
|
|
|
|
$j = strlen( $body ); // Legnth of the HTML
|
|
$ret = ''; // Returned string
|
|
$bgcolor = '#ffffff'; // Background style color (defaults to white)
|
|
$leftmargin = ''; // Left margin style
|
|
$title = ''; // HTML title if any
|
|
|
|
$i = 0;
|
|
while( $i < $j ) {
|
|
if( $body{$i} == '<' ) {
|
|
$tag = $body{$i+1}.$body{$i+2}.$body{$i+3}.$body{$i+4};
|
|
switch( strtoupper( $tag ) ) {
|
|
// Strips the entire tag and contents
|
|
case 'APPL':
|
|
case 'EMBB':
|
|
case 'FRAM':
|
|
case 'SCRI':
|
|
case 'OBJE':
|
|
$etg = '/' . $tag;
|
|
while( $body{$i+1}.$body{$i+2}.$body{$i+3}.$body{$i+4}.$body{$i+5} <> $etg &&
|
|
$i < $j ) $i++;
|
|
while( $i < $j && $body{++$i} <> '>' );
|
|
// $ret .= "<!-- $tag removed -->";
|
|
break;
|
|
// Substitute Title
|
|
case 'TITL':
|
|
$i += 5;
|
|
while( $body{$i} <> '>' && // </title>
|
|
$i < $j )
|
|
$i++;
|
|
$i++;
|
|
$title = '';
|
|
while( $body{$i} <> '<' && // </title>
|
|
$i < $j ) {
|
|
$title .= $body{$i};
|
|
$i++;
|
|
}
|
|
$i += 7;
|
|
break;
|
|
// Destroy these tags
|
|
case 'HTML':
|
|
case 'HEAD':
|
|
case '/HTM':
|
|
case '/HEA':
|
|
case '!DOC':
|
|
case 'META':
|
|
case 'DIV ':
|
|
case '/DIV':
|
|
case '!-- ':
|
|
$i += 4;
|
|
while( $body{$i} <> '>' &&
|
|
$i < $j )
|
|
$i++;
|
|
// $i++;
|
|
break;
|
|
case 'STYL':
|
|
$i += 5;
|
|
while( $body{$i} <> '>' && // </title>
|
|
$i < $j )
|
|
$i++;
|
|
$i++;
|
|
// We parse the style to look for interesting stuff
|
|
$styleblk = '';
|
|
while( $body{$i} <> '>' &&
|
|
$i < $j ) {
|
|
// First we get the name of the style
|
|
$style = '';
|
|
while( $body{$i} <> '>' &&
|
|
$body{$i} <> '<' &&
|
|
$body{$i} <> '{' &&
|
|
$i < $j ) {
|
|
if( isnoSep( $body{$i} ) )
|
|
$style .= $body{$i};
|
|
$i++;
|
|
}
|
|
stripComments( $i, $j, $body );
|
|
$style = strtoupper( trim( $style ) );
|
|
if( $style == 'BODY' ) {
|
|
// Next we look into the definitions of the body style
|
|
while( $body{$i} <> '>' &&
|
|
$body{$i} <> '}' &&
|
|
$i < $j ) {
|
|
// We look for the background color if any.
|
|
if( substr( $body, $i, 17 ) == 'BACKGROUND-COLOR:' ) {
|
|
$i += 17;
|
|
$bgcolor = getStyleData( $i, $j, $body );
|
|
} elseif ( substr( $body, $i, 12 ) == 'MARGIN-LEFT:' ) {
|
|
$i += 12;
|
|
$leftmargin = getStyleData( $i, $j, $body );
|
|
}
|
|
$i++;
|
|
}
|
|
} else {
|
|
// Other style are mantained
|
|
$styleblk .= "$style ";
|
|
while( $body{$i} <> '>' &&
|
|
$body{$i} <> '<' &&
|
|
$body{$i} <> '}' &&
|
|
$i < $j ) {
|
|
$styleblk .= $body{$i};
|
|
$i++;
|
|
}
|
|
$styleblk .= $body{$i};
|
|
}
|
|
stripComments( $i, $j, $body );
|
|
if( $body{$i} <> '>' )
|
|
$i++;
|
|
}
|
|
if( $styleblk <> '' )
|
|
$ret .= "<style>$styleblk";
|
|
break;
|
|
case 'BODY':
|
|
if( $title <> '' )
|
|
$ret .= '<b>' . _("Title:") . " </b>$title<br>\n";
|
|
$ret .= "<TABLE";
|
|
$i += 5;
|
|
if (! isset($base))
|
|
$base = '';
|
|
$ret .= stripEvent( $i, $j, $body, $id, $base );
|
|
//if( $bgcolor <> '' )
|
|
$ret .= " bgcolor=$bgcolor";
|
|
$ret .= ' width=100%><tr>';
|
|
if( $leftmargin <> '' )
|
|
$ret .= "<td width=$leftmargin> </td>";
|
|
$ret .= '<td>';
|
|
break;
|
|
case 'BASE':
|
|
$i += 5;
|
|
$base = '';
|
|
while( !isNoSep( $body{$i} ) &&
|
|
$i < $j )
|
|
$i++;
|
|
if( strcasecmp( substr( $base, 0, 4 ), 'href' ) ) {
|
|
$i += 5;
|
|
while( !isNoSep( $body{$i} ) &&
|
|
$i < $j )
|
|
$i++;
|
|
while( $body{$i} <> '>' &&
|
|
$i < $j ) {
|
|
if( $body{$i} <> '"' )
|
|
$base .= $body{$i};
|
|
$i++;
|
|
}
|
|
// Debuging $ret .= "<!-- base == $base -->";
|
|
if( strcasecmp( substr( $base, 0, 4 ), 'file' ) <> 0 )
|
|
$ret .= "\n<BASE HREF=\"$base\">\n";
|
|
}
|
|
break;
|
|
case '/BOD':
|
|
$ret .= '</td></tr></TABLE>';
|
|
$i += 6;
|
|
break;
|
|
default:
|
|
// Following tags can contain some event handler, lets search it
|
|
stripComments( $i, $j, $body );
|
|
if (! isset($base))
|
|
$base = '';
|
|
$ret .= stripEvent( $i, $j, $body, $id, $base ) . '>';
|
|
// $ret .= "<!-- $tag detected -->";
|
|
}
|
|
} else {
|
|
$ret .= $body{$i};
|
|
}
|
|
$i++;
|
|
}
|
|
|
|
return( "\n\n<!-- HTML Output ahead -->\n" .
|
|
$ret .
|
|
"\n<!-- END of HTML Output --><base href=\"".
|
|
$HTTP_SERVER_VARS["SERVER_NAME"] . substr( $PHP_SELF, 0, strlen( $PHP_SELF ) - 13 ) .
|
|
"\">\n\n" );
|
|
}
|
|
|
|
function isNoSep( $char ) {
|
|
|
|
switch( $char ) {
|
|
case ' ':
|
|
case "\n":
|
|
case "\t":
|
|
case "\r":
|
|
case '>':
|
|
case '"':
|
|
return( FALSE );
|
|
break;
|
|
default:
|
|
return( TRUE );
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
The following function is usefull to remove extra data that can cause
|
|
html not to display properly. Especialy with MS stuff.
|
|
*/
|
|
|
|
function stripComments( &$i, $j, &$body ) {
|
|
|
|
while( $body{$i}.$body{$i+1}.$body{$i+2}.$body{$i+3} == '<!--' &&
|
|
$i < $j ) {
|
|
$i += 5;
|
|
while( $body{$i-2}.$body{$i-1}.$body{$i} <> '-->' &&
|
|
$i < $j )
|
|
$i++;
|
|
$i++;
|
|
}
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
/* Gets the style data of a specific style */
|
|
|
|
function getStyleData( &$i, $j, &$body ) {
|
|
|
|
// We skip spaces
|
|
while( $body{$i} <> '>' && !isNoSep( $body{$i} ) &&
|
|
$i < $j ) {
|
|
$i++;
|
|
}
|
|
// And get the color
|
|
$ret = '';
|
|
while( isNoSep( $body{$i} ) &&
|
|
$i < $j ) {
|
|
$ret .= $body{$i};
|
|
$i++;
|
|
}
|
|
|
|
return( $ret );
|
|
}
|
|
|
|
/*
|
|
Private function for strip_dangerous_tag. Look for event based coded and "remove" it
|
|
change on with no (onload -> noload)
|
|
*/
|
|
|
|
function stripEvent( &$i, $j, &$body, $id, $base ) {
|
|
|
|
global $message;
|
|
|
|
$ret = '';
|
|
|
|
while( $body{$i} <> '>' &&
|
|
$i < $j ) {
|
|
$etg = strtolower($body{$i}.$body{$i+1}.$body{$i+2});
|
|
switch( $etg ) {
|
|
case '../':
|
|
// Retrolinks are not allowed without a base because they mess with SM security
|
|
if( $base == '' ) {
|
|
$i += 2;
|
|
} else {
|
|
$ret .= '.';
|
|
}
|
|
break;
|
|
case 'cid':
|
|
// Internal link
|
|
$k = $i-1;
|
|
if( $body{$i+3} == ':') {
|
|
$i +=4;
|
|
$name = '';
|
|
while( isNoSep( $body{$i} ) &&
|
|
$i < $j )
|
|
$name .= $body{$i++};
|
|
if( $name <> '' ) {
|
|
$ret .= "../src/download.php?absolute_dl=true&passed_id=$id&mailbox=" .
|
|
urlencode( $message->header->mailbox ) .
|
|
"&passed_ent_id=" . find_ent_id( $name, $message );
|
|
if( $body{$k} == '"' )
|
|
$ret .= '" ';
|
|
else
|
|
$ret .= ' ';
|
|
}
|
|
if( $body{$i} == '>' )
|
|
$i -= 1;
|
|
}
|
|
break;
|
|
case ' on':
|
|
case "\non":
|
|
case "\ron":
|
|
case "\ton":
|
|
$ret .= ' no';
|
|
$i += 2;
|
|
break;
|
|
case 'pt:':
|
|
if( strcasecmp( $body{$i-4}.$body{$i-3}.$body{$i-2}.$body{$i-1}.$body{$i}.$body{$i+1}.$body{$i+2}, 'script:') == 0 ) {
|
|
$ret .= '_no/';
|
|
} else {
|
|
$ret .= $etg;
|
|
}
|
|
$i += 2;
|
|
break;
|
|
default:
|
|
$ret .= $body{$i};
|
|
}
|
|
$i++;
|
|
}
|
|
return( $ret );
|
|
}
|
|
|
|
|
|
/* This function trys to locate the entity_id of a specific mime element */
|
|
|
|
function find_ent_id( $id, $message ) {
|
|
|
|
$ret = '';
|
|
for ($i=0; $ret == '' && $i < count($message->entities); $i++) {
|
|
|
|
if( $message->entities[$i]->header->entity_id == '' ) {
|
|
$ret = find_ent_id( $id, $message->entities[$i] );
|
|
} else {
|
|
if( strcasecmp( $message->entities[$i]->header->id, $id ) == 0 )
|
|
$ret = $message->entities[$i]->header->entity_id;
|
|
}
|
|
|
|
}
|
|
|
|
return( $ret );
|
|
|
|
}
|
|
?>
|