6 * Copyright (c) 1999-2003 The SquirrelMail Project Team
7 * Licensed under the GNU GPL. For full terms see the file COPYING.
9 * This contains the functions necessary to detect and decode MIME
13 * @package squirrelmail
16 /** The typical includes... */
17 require_once(SM_PATH
. 'functions/imap.php');
18 require_once(SM_PATH
. 'functions/attachment_common.php');
20 /* -------------------------------------------------------------------------- */
22 /* -------------------------------------------------------------------------- */
25 * Get the MIME structure
27 * This function gets the structure of a message and stores it in the "message" class.
28 * It will return this object for use with all relevant header information and
29 * fully parsed into the standard "message" object format.
31 function mime_structure ($bodystructure, $flags=array()) {
33 /* Isolate the body structure and remove beginning and end parenthesis. */
34 $read = trim(substr ($bodystructure, strpos(strtolower($bodystructure), 'bodystructure') +
13));
35 $read = trim(substr ($read, 0, -1));
37 $msg = Message
::parseStructure($read,$i);
38 if (!is_object($msg)) {
39 include_once(SM_PATH
. 'functions/display_messages.php');
40 global $color, $mailbox;
41 /* removed urldecode because $_GET is auto urldecoded ??? */
42 displayPageHeader( $color, $mailbox );
43 $errormessage = _("SquirrelMail could not decode the bodystructure of the message");
44 $errormessage .= '<BR>'._("the provided bodystructure by your imap-server").':<BR><BR>';
45 $errormessage .= '<pre>' . htmlspecialchars($read) . '</pre>';
46 plain_error_message( $errormessage, $color );
47 echo '</body></html>';
51 foreach ($flags as $flag) {
52 $char = strtoupper($flag{1});
55 if (strtolower($flag) == '\\seen') {
60 if (strtolower($flag) == '\\answered') {
61 $msg->is_answered
= true;
65 if (strtolower($flag) == '\\deleted') {
66 $msg->is_deleted
= true;
70 if (strtolower($flag) == '\\flagged') {
71 $msg->is_flagged
= true;
75 if (strtolower($flag) == '$mdnsent') {
76 $msg->is_mdnsent
= true;
84 // listEntities($msg);
90 /* This starts the parsing of a particular structure. It is called recursively,
91 * so it can be passed different structures. It returns an object of type
93 * First, it checks to see if it is a multipart message. If it is, then it
94 * handles that as it sees is necessary. If it is just a regular entity,
95 * then it parses it and adds the necessary header information (by calling out
96 * to mime_get_elements()
99 function mime_fetch_body($imap_stream, $id, $ent_id=1, $fetch_size=0) {
101 /* Do a bit of error correction. If we couldn't find the entity id, just guess
102 * that it is the first one. That is usually the case anyway.
106 $cmd = "FETCH $id BODY[]";
108 $cmd = "FETCH $id BODY[$ent_id]";
111 if ($fetch_size!=0) $cmd .= "<0.$fetch_size>";
113 $data = sqimap_run_command ($imap_stream, $cmd, true, $response, $message, $uid_support);
115 $topline = trim(array_shift($data));
116 } while($topline && ($topline[0] == '*') && !preg_match('/\* [0-9]+ FETCH.*/i', $topline)) ;
118 $wholemessage = implode('', $data);
119 if (ereg('\\{([^\\}]*)\\}', $topline, $regs)) {
120 $ret = substr($wholemessage, 0, $regs[1]);
121 /* There is some information in the content info header that could be important
122 * in order to parse html messages. Let's get them here.
124 // if ($ret{0} == '<') {
125 // $data = sqimap_run_command ($imap_stream, "FETCH $id BODY[$ent_id.MIME]", true, $response, $message, $uid_support);
127 } else if (ereg('"([^"]*)"', $topline, $regs)) {
130 global $where, $what, $mailbox, $passed_id, $startMessage;
131 $par = 'mailbox=' . urlencode($mailbox) . '&passed_id=' . $passed_id;
132 if (isset($where) && isset($what)) {
133 $par .= '&where=' . urlencode($where) . '&what=' . urlencode($what);
135 $par .= '&startMessage=' . $startMessage . '&show_more=0';
137 $par .= '&response=' . urlencode($response) .
138 '&message=' . urlencode($message) .
139 '&topline=' . urlencode($topline);
142 '<table width="80%"><tr>' .
143 '<tr><td colspan=2>' .
144 _("Body retrieval error. The reason for this is most probably that the message is malformed.") .
146 '<tr><td><b>' . _("Command:") . "</td><td>$cmd</td></tr>" .
147 '<tr><td><b>' . _("Response:") . "</td><td>$response</td></tr>" .
148 '<tr><td><b>' . _("Message:") . "</td><td>$message</td></tr>" .
149 '<tr><td><b>' . _("FETCH line:") . "</td><td>$topline</td></tr>" .
150 "</table><BR></tt></font><hr>";
152 $data = sqimap_run_command ($imap_stream, "FETCH $passed_id BODY[]", true, $response, $message, $uid_support);
154 $wholemessage = implode('', $data);
156 $ret = $wholemessage;
161 function mime_print_body_lines ($imap_stream, $id, $ent_id=1, $encoding) {
164 /* Don't kill the connection if the browser is over a dialup
165 * and it would take over 30 seconds to download it.
166 * Dont call set_time_limit in safe mode.
169 if (!ini_get('safe_mode')) {
172 /* in case of base64 encoded attachments, do not buffer them.
173 Instead, echo the decoded attachment directly to screen */
174 if (strtolower($encoding) == 'base64') {
176 $query = "FETCH $id BODY[]";
178 $query = "FETCH $id BODY[$ent_id]";
180 sqimap_run_command($imap_stream,$query,true,$response,$message,$uid_support,'sqimap_base64_decode','php://stdout',true);
182 $body = mime_fetch_body ($imap_stream, $id, $ent_id);
183 echo decodeBody($body, $encoding);
187 TODO, use the same method for quoted printable.
188 However, I assume that quoted printable attachments aren't that large
189 so the performancegain / memory usage drop will be minimal.
190 If we decide to add that then we need to adapt sqimap_fread because
191 we need to split te result on \n and fread doesn't stop at \n. That
192 means we also should provide $results from sqimap_fread (by ref) to
193 te function and set $no_return to false. The $filter function for
194 quoted printable should handle unsetting of $results.
197 TODO 2: find out how we write to the output stream php://stdout. fwrite
198 doesn't work because 'php://stdout isn't a stream.
203 fputs ($imap_stream, "$sid FETCH $id BODY[$ent_id]\r\n");
206 $read = fgets ($imap_stream,8192);
209 // This could be bad -- if the section has sqimap_session_id() . ' OK'
210 // or similar, it will kill the download.
211 while (!ereg("^".$sid_s." (OK|BAD|NO)(.*)$", $read, $regs)) {
212 if (trim($read) == ')==') {
214 $read = fgets ($imap_stream,4096);
215 if (ereg("^".$sid." (OK|BAD|NO)(.*)$", $read, $regs)) {
218 echo decodeBody($read1, $encoding) .
219 decodeBody($read, $encoding);
222 echo decodeBody($read, $encoding);
224 $read = fgets ($imap_stream,4096);
231 /* -[ END MIME DECODING ]----------------------------------------------------------- */
233 /* This is here for debugging purposes. It will print out a list
234 * of all the entity IDs that are in the $message object.
236 function listEntities ($message) {
238 echo "<tt>" . $message->entity_id
. ' : ' . $message->type0
. '/' . $message->type1
. ' parent = '. $message->parent
->entity_id
. '<br>';
239 for ($i = 0; isset($message->entities
[$i]); $i++
) {
241 $msg = listEntities($message->entities
[$i]);
251 function getPriorityStr($priority) {
252 $priority_level = substr($priority,0,1);
254 switch($priority_level) {
255 /* Check for a higher then normal priority. */
258 $priority_string = _("High");
261 /* Check for a lower then normal priority. */
264 $priority_string = _("Low");
267 /* Check for a normal priority. */
270 $priority_level = '3';
271 $priority_string = _("Normal");
275 return $priority_string;
278 /* returns a $message object for a particular entity id */
279 function getEntity ($message, $ent_id) {
280 return $message->getEntity($ent_id);
284 * Extracted from strings.php 23/03/2002
287 function translateText(&$body, $wrap_at, $charset) {
288 global $where, $what; /* from searching */
289 global $color; /* color theme */
291 require_once(SM_PATH
. 'functions/url_parser.php');
293 $body_ary = explode("\n", $body);
294 for ($i=0; $i < count($body_ary); $i++
) {
295 $line = $body_ary[$i];
296 if (strlen($line) - 2 >= $wrap_at) {
297 sqWordWrap($line, $wrap_at);
299 $line = charset_decode($charset, $line);
300 $line = str_replace("\t", ' ', $line);
309 if ($line[$pos] == ' ') {
311 } else if (strpos($line, '>', $pos) === $pos) {
320 if (!isset($color[13])) {
321 $color[13] = '#800000';
323 $line = '<font color="' . $color[13] . '">' . $line . '</font>';
325 if (!isset($color[14])) {
326 $color[14] = '#FF0000';
328 $line = '<font color="' . $color[14] . '">' . $line . '</font>';
331 $body_ary[$i] = $line;
333 $body = '<pre>' . implode("\n", $body_ary) . '</pre>';
336 /* This returns a parsed string called $body. That string can then
337 * be displayed as the actual message in the HTML. It contains
338 * everything needed, including HTML Tags, Attachments at the
341 function formatBody($imap_stream, $message, $color, $wrap_at, $ent_num, $id, $mailbox='INBOX') {
342 /* This if statement checks for the entity to show as the
343 * primary message. To add more of them, just put them in the
344 * order that is their priority.
346 global $startMessage, $username, $key, $imapServerAddress, $imapPort,
347 $show_html_default, $sort, $has_unsafe_images, $passed_ent_id;
348 global $languages, $squirrelmail_language;
350 if( !sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET
) ) {
351 $view_unsafe_images = false;
355 $urlmailbox = urlencode($mailbox);
356 $body_message = getEntity($message, $ent_num);
357 if (($body_message->header
->type0
== 'text') ||
358 ($body_message->header
->type0
== 'rfc822')) {
359 $body = mime_fetch_body ($imap_stream, $id, $ent_num);
360 $body = decodeBody($body, $body_message->header
->encoding
);
362 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
363 function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) {
364 if (mb_detect_encoding($body) != 'ASCII') {
365 $body = $languages[$squirrelmail_language]['XTRA_CODE']('decode', $body);
368 $hookResults = do_hook("message_body", $body);
369 $body = $hookResults[1];
371 /* If there are other types that shouldn't be formatted, add
375 if ($body_message->header
->type1
== 'html') {
376 if ($show_html_default <> 1) {
377 $entity_conv = array(' ' => ' ',
384 $body = strtr($body, $entity_conv);
385 $body = strip_tags($body);
387 translateText($body, $wrap_at,
388 $body_message->header
->getParameter('charset'));
390 $body = magicHTML($body, $id, $message, $mailbox);
393 translateText($body, $wrap_at,
394 $body_message->header
->getParameter('charset'));
396 $link = 'passed_id=' . $id . '&ent_id='.$ent_num.
397 '&mailbox=' . $urlmailbox .'&sort=' . $sort .
398 '&startMessage=' . $startMessage . '&show_more=0';
399 if (isset($passed_ent_id)) {
400 $link .= '&passed_ent_id='.$passed_ent_id;
402 $body .= '<center><small><a href="download.php?absolute_dl=true&' .
403 $link . '">' . _("Download this as a file") . '</a>';
404 if ($view_unsafe_images) {
405 $text = _("Hide Unsafe Images");
407 if (isset($has_unsafe_images) && $has_unsafe_images) {
408 $link .= '&view_unsafe_images=1';
409 $text = _("View Unsafe Images");
415 $body .= ' | <a href="read_body.php?' . $link . '">' . $text . '</a>';
417 $body .= '</small></center><br>' . "\n";
423 function formatAttachments($message, $exclude_id, $mailbox, $id) {
424 global $where, $what, $startMessage, $color;
425 static $ShownHTML = 0;
427 $att_ar = $message->getAttachments($exclude_id);
429 if (!count($att_ar)) return '';
433 $urlMailbox = urlencode($mailbox);
435 foreach ($att_ar as $att) {
436 $ent = $att->entity_id
;
437 $header = $att->header
;
438 $type0 = strtolower($header->type0
);
439 $type1 = strtolower($header->type1
);
441 $links['download link']['text'] = _("download");
442 $links['download link']['href'] = SM_PATH
.
443 "src/download.php?absolute_dl=true&passed_id=$id&mailbox=$urlMailbox&ent_id=$ent";
445 if ($type0 =='message' && $type1 == 'rfc822') {
446 $default_page = SM_PATH
. 'src/read_body.php';
447 $rfc822_header = $att->rfc822_header
;
448 $filename = $rfc822_header->subject
;
449 if (trim( $filename ) == '') {
450 $filename = 'untitled-[' . $ent . ']' ;
452 $from_o = $rfc822_header->from
;
453 if (is_object($from_o)) {
454 $from_name = decodeHeader($from_o->getAddress(false));
456 $from_name = _("Unknown sender");
458 $description = $from_name;
460 $default_page = SM_PATH
. 'src/download.php';
461 if (is_object($header->disposition
)) {
462 $filename = $header->disposition
->getProperty('filename');
463 if (trim($filename) == '') {
464 $name = decodeHeader($header->disposition
->getProperty('name'));
465 if (trim($name) == '') {
466 $name = $header->getParameter('name');
467 if(trim($name) == '') {
468 if (trim( $header->id
) == '') {
469 $filename = 'untitled-[' . $ent . ']' ;
471 $filename = 'cid: ' . $header->id
;
481 $filename = $header->getParameter('name');
482 if (!trim($filename)) {
483 if (trim( $header->id
) == '') {
484 $filename = 'untitled-[' . $ent . ']' ;
486 $filename = 'cid: ' . $header->id
;
490 if ($header->description
) {
491 $description = decodeHeader($header->description
);
497 $display_filename = $filename;
498 if (isset($passed_ent_id)) {
499 $passed_ent_id_link = '&passed_ent_id='.$passed_ent_id;
501 $passed_ent_id_link = '';
503 $defaultlink = $default_page . "?startMessage=$startMessage"
504 . "&passed_id=$id&mailbox=$urlMailbox"
505 . '&ent_id='.$ent.$passed_ent_id_link;
506 if ($where && $what) {
507 $defaultlink .= '&where='. urlencode($where).'&what='.urlencode($what);
509 /* This executes the attachment hook with a specific MIME-type.
510 * If that doesn't have results, it tries if there's a rule
511 * for a more generic type.
513 $hookresults = do_hook("attachment $type0/$type1", $links,
514 $startMessage, $id, $urlMailbox, $ent, $defaultlink,
515 $display_filename, $where, $what);
516 if(count($hookresults[1]) <= 1) {
517 $hookresults = do_hook("attachment $type0/*", $links,
518 $startMessage, $id, $urlMailbox, $ent, $defaultlink,
519 $display_filename, $where, $what);
522 $links = $hookresults[1];
523 $defaultlink = $hookresults[6];
525 $attachments .= '<TR><TD>' .
526 '<A HREF="'.$defaultlink.'">'.decodeHeader($display_filename).'</A> </TD>' .
527 '<TD><SMALL><b>' . show_readable_size($header->size
) .
528 '</b> </small></TD>' .
529 "<TD><SMALL>[ $type0/$type1 ] </SMALL></TD>" .
531 $attachments .= '<b>' . $description . '</b>';
532 $attachments .= '</SMALL></TD><TD><SMALL> ';
535 foreach ($links as $val) {
539 $attachments .= ' | ';
541 $attachments .= '<a href="' . $val['href'] . '">' . $val['text'] . '</a>';
544 $attachments .= "</TD></TR>\n";
546 $attachmentadd = do_hook_function('attachments_bottom',$attachments);
547 if ($attachmentadd != '')
548 $attachments = $attachmentadd;
552 function sqimap_base64_decode(&$string) {
553 $string = str_replace("\r\n", "\n", $string);
554 $string = base64_decode($string);
557 /* This function decodes the body depending on the encoding type. */
558 function decodeBody($body, $encoding) {
559 global $show_html_default;
561 $body = str_replace("\r\n", "\n", $body);
562 $encoding = strtolower($encoding);
564 $encoding_handler = do_hook_function('decode_body', $encoding);
567 // plugins get first shot at decoding the body
569 if (!empty($encoding_handler) && function_exists($encoding_handler)) {
570 $body = $encoding_handler('decode', $body);
572 } else if ($encoding == 'quoted-printable' ||
573 $encoding == 'quoted_printable') {
574 $body = quoted_printable_decode($body);
576 while (ereg("=\n", $body)) {
577 $body = ereg_replace ("=\n", '', $body);
580 } else if ($encoding == 'base64') {
581 $body = base64_decode($body);
584 // All other encodings are returned raw.
591 * This functions decode strings that is encoded according to
592 * RFC1522 (MIME Part Two: Message Header Extensions for Non-ASCII Text).
593 * Patched by Christian Schmidt <christian@ostenfeld.dk> 23/03/2002
595 * @param string $string header string that has to be made readable
596 * @param boolean $utfencode change message in order to be readable on user's charset. defaults to true
597 * @param boolean $htmlsave preserve spaces and sanitize html special characters. defaults to true
598 * @param boolean $decide decide if string can be utfencoded. defaults to false
599 * @return string decoded header string
601 function decodeHeader ($string, $utfencode=true,$htmlsave=true,$decide=false) {
602 global $languages, $squirrelmail_language;
603 if (is_array($string)) {
604 $string = implode("\n", $string);
607 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
608 function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) {
609 $string = $languages[$squirrelmail_language]['XTRA_CODE']('decodeheader', $string);
610 // Do we need to return at this point?
617 $aString = explode(' ',$string);
619 foreach ($aString as $chunk) {
620 if ($encoded && $chunk === '') {
622 } elseif ($chunk === '') {
627 /* if encoded words are not separated by a linear-space-white we still catch them */
630 while ($match = preg_match('/^(.*)=\?([^?]*)\?(Q|B)\?([^?]*)\?=(.*)$/Ui',$chunk,$res)) {
631 /* if the last chunk isn't an encoded string then put back the space, otherwise don't */
632 if ($iLastMatch !== $j) {
642 $encoding = ucfirst($res[3]);
646 $replace = base64_decode($res[4]);
647 $ret .= charset_decode($res[2],$replace);
650 $replace = str_replace('_', ' ', $res[4]);
651 $replace = preg_replace('/=([0-9a-f]{2})/ie', 'chr(hexdec("\1"))',
653 /* decide about valid decoding */
654 if ($decide && is_conversion_safe($res[2])) {
656 $can_be_decoded=true;
658 $can_be_decoded=false;
660 /* Only encode into entities by default. Some places
661 * don't need the encoding, like the compose form.
664 $replace = charset_decode($res[2], $replace);
667 $replace = htmlspecialchars($replace);
686 if (!$encoded && $htmlsave) {
687 $ret .= htmlspecialchars($chunk);
693 /* remove the first added space */
696 $ret = substr($ret,5);
698 $ret = substr($ret,1);
706 * Encodes header as quoted-printable
708 * Encode a string according to RFC 1522 for use in headers if it
709 * contains 8-bit characters or anything that looks like it should
712 * @param string $string header string, that has to be encoded
713 * @return string quoted-printable encoded string
715 function encodeHeader ($string) {
716 global $default_charset, $languages, $squirrelmail_language;
718 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
719 function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) {
720 return $languages[$squirrelmail_language]['XTRA_CODE']('encodeheader', $string);
722 // instead of removing nbsp here, we don't add it in decodeHeader
723 // if (strtolower($default_charset) == 'iso-8859-1') {
724 // $string = str_replace("\240",' ',$string);
727 // Encode only if the string contains 8-bit characters or =?
728 $j = strlen($string);
729 $max_l = 75 - strlen($default_charset) - 7;
732 $iEncStart = $enc_init = false;
733 $cur_l = $iOffset = 0;
734 for($i = 0; $i < $j; ++
$i) {
743 if ($iEncStart === false) {
747 if ($cur_l > ($max_l-2)) {
748 /* if there is an stringpart that doesn't need encoding, add it */
749 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
750 $aRet[] = "=?$default_charset?Q?$ret?=";
756 $ret .= sprintf("=%02X",ord($string{$i}));
761 if ($iEncStart !== false) {
762 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
763 $aRet[] = "=?$default_charset?Q?$ret?=";
771 if ($iEncStart !== false) {
773 if ($cur_l > $max_l) {
774 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
775 $aRet[] = "=?$default_charset?Q?$ret?=";
786 $k = ord($string{$i});
788 if ($iEncStart === false) {
789 // do not start encoding in the middle of a string, also take the rest of the word.
790 $sLeadString = substr($string,0,$i);
791 $aLeadString = explode(' ',$sLeadString);
792 $sToBeEncoded = array_pop($aLeadString);
793 $iEncStart = $i - strlen($sToBeEncoded);
794 $ret .= $sToBeEncoded;
795 $cur_l +
= strlen($sToBeEncoded);
798 /* first we add the encoded string that reached it's max size */
799 if ($cur_l > ($max_l-2)) {
800 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
801 $aRet[] = "=?$default_charset?Q?$ret?= "; /* the next part is also encoded => separate by space */
808 $ret .= sprintf("=%02X", $k);
810 if ($iEncStart !== false) {
812 if ($cur_l > $max_l) {
813 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
814 $aRet[] = "=?$default_charset?Q?$ret?=";
829 if ($iEncStart !== false) {
830 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
831 $aRet[] = "=?$default_charset?Q?$ret?=";
833 $aRet[] = substr($string,$iOffset);
835 $string = implode('',$aRet);
840 /* This function trys to locate the entity_id of a specific mime element */
841 function find_ent_id($id, $message) {
842 for ($i = 0, $ret = ''; $ret == '' && $i < count($message->entities
); $i++
) {
843 if ($message->entities
[$i]->header
->type0
== 'multipart') {
844 $ret = find_ent_id($id, $message->entities
[$i]);
846 if (strcasecmp($message->entities
[$i]->header
->id
, $id) == 0) {
847 // if (sq_check_save_extension($message->entities[$i])) {
848 return $message->entities
[$i]->entity_id
;
856 function sq_check_save_extension($message) {
857 $filename = $message->getFilename();
858 $ext = substr($filename, strrpos($filename,'.')+
1);
859 $save_extensions = array('jpg','jpeg','gif','png','bmp');
860 return in_array($ext, $save_extensions);
865 ** HTMLFILTER ROUTINES
869 * This function is more or less a wrapper around stripslashes. Apparently
870 * Explorer is stupid enough to just remove the backslashes and then
871 * execute the content of the attribute as if nothing happened.
874 * @param attvalue The value of the attribute
875 * @return attvalue The value of the attribute stripslashed.
877 function sq_unbackslash($attvalue){
879 * Remove any backslashes. See if there are any first.
882 if (strstr($attvalue, '\\') !== false){
883 $attvalue = stripslashes($attvalue);
889 * Kill any tabs, newlines, or carriage returns. Our friends the
890 * makers of the browser with 95% market value decided that it'd
891 * be funny to make "java[tab]script" be just as good as "javascript".
893 * @param attvalue The attribute value before extraneous spaces removed.
894 * @return attvalue The attribute value after extraneous spaces removed.
896 function sq_unspace($attvalue){
897 if (strcspn($attvalue, "\t\r\n") != strlen($attvalue)){
898 $attvalue = str_replace(Array("\t", "\r", "\n"), Array('', '', ''),
905 * This function returns the final tag out of the tag name, an array
906 * of attributes, and the type of the tag. This function is called by
907 * sq_sanitize internally.
909 * @param $tagname the name of the tag.
910 * @param $attary the array of attributes and their values
911 * @param $tagtype The type of the tag (see in comments).
912 * @return a string with the final tag representation.
914 function sq_tagprint($tagname, $attary, $tagtype){
918 $fulltag = '</' . $tagname . '>';
920 $fulltag = '<' . $tagname;
921 if (is_array($attary) && sizeof($attary)){
923 while (list($attname, $attvalue) = each($attary)){
924 array_push($atts, "$attname=$attvalue");
926 $fulltag .= ' ' . join(" ", $atts);
937 * A small helper function to use with array_walk. Modifies a by-ref
938 * value and makes it lowercase.
940 * @param $val a value passed by-ref.
941 * @return void since it modifies a by-ref value.
943 function sq_casenormalize(&$val){
944 $val = strtolower($val);
948 * This function skips any whitespace from the current position within
949 * a string and to the next non-whitespace value.
951 * @param $body the string
952 * @param $offset the offset within the string where we should start
953 * looking for the next non-whitespace character.
954 * @return the location within the $body where the next
955 * non-whitespace char is located.
957 function sq_skipspace($body, $offset){
958 $me = 'sq_skipspace';
959 preg_match('/^(\s*)/s', substr($body, $offset), $matches);
960 if (sizeof($matches{1})){
961 $count = strlen($matches{1});
968 * This function looks for the next character within a string. It's
969 * really just a glorified "strpos", except it catches if failures
972 * @param $body The string to look for needle in.
973 * @param $offset Start looking from this position.
974 * @param $needle The character/string to look for.
975 * @return location of the next occurance of the needle, or
976 * strlen($body) if needle wasn't found.
978 function sq_findnxstr($body, $offset, $needle){
979 $me = 'sq_findnxstr';
980 $pos = strpos($body, $needle, $offset);
982 $pos = strlen($body);
988 * This function takes a PCRE-style regexp and tries to match it
991 * @param $body The string to look for needle in.
992 * @param $offset Start looking from here.
993 * @param $reg A PCRE-style regex to match.
994 * @return Returns a false if no matches found, or an array
995 * with the following members:
996 * - integer with the location of the match within $body
997 * - string with whatever content between offset and the match
998 * - string with whatever it is we matched
1000 function sq_findnxreg($body, $offset, $reg){
1001 $me = 'sq_findnxreg';
1004 preg_match("%^(.*?)($reg)%si", substr($body, $offset), $matches);
1005 if (!isset($matches{0}) ||
!$matches{0}){
1008 $retarr{0} = $offset +
strlen($matches{1});
1009 $retarr{1} = $matches{1};
1010 $retarr{2} = $matches{2};
1016 * This function looks for the next tag.
1018 * @param $body String where to look for the next tag.
1019 * @param $offset Start looking from here.
1020 * @return false if no more tags exist in the body, or
1021 * an array with the following members:
1022 * - string with the name of the tag
1023 * - array with attributes and their values
1024 * - integer with tag type (1, 2, or 3)
1025 * - integer where the tag starts (starting "<")
1026 * - integer where the tag ends (ending ">")
1027 * first three members will be false, if the tag is invalid.
1029 function sq_getnxtag($body, $offset){
1030 $me = 'sq_getnxtag';
1031 if ($offset > strlen($body)){
1034 $lt = sq_findnxstr($body, $offset, "<");
1035 if ($lt == strlen($body)){
1040 * blah blah <tag attribute="value">
1043 $pos = sq_skipspace($body, $lt+
1);
1044 if ($pos >= strlen($body)){
1045 return Array(false, false, false, $lt, strlen($body));
1048 * There are 3 kinds of tags:
1049 * 1. Opening tag, e.g.:
1051 * 2. Closing tag, e.g.:
1053 * 3. XHTML-style content-less tag, e.g.:
1057 switch (substr($body, $pos, 1)){
1064 * A comment or an SGML declaration.
1066 if (substr($body, $pos+
1, 2) == "--"){
1067 $gt = strpos($body, "-->", $pos);
1069 $gt = strlen($body);
1073 return Array(false, false, false, $lt, $gt);
1075 $gt = sq_findnxstr($body, $pos, ">");
1076 return Array(false, false, false, $lt, $gt);
1081 * Assume tagtype 1 for now. If it's type 3, we'll switch values
1091 * Look for next [\W-_], which will indicate the end of the tag name.
1093 $regary = sq_findnxreg($body, $pos, "[^\w\-_]");
1094 if ($regary == false){
1095 return Array(false, false, false, $lt, strlen($body));
1097 list($pos, $tagname, $match) = $regary;
1098 $tagname = strtolower($tagname);
1101 * $match can be either of these:
1102 * '>' indicating the end of the tag entirely.
1103 * '\s' indicating the end of the tag name.
1104 * '/' indicating that this is type-3 xhtml tag.
1106 * Whatever else we find there indicates an invalid tag.
1111 * This is an xhtml-style tag with a closing / at the
1112 * end, like so: <img src="blah"/>. Check if it's followed
1113 * by the closing bracket. If not, then this tag is invalid
1115 if (substr($body, $pos, 2) == "/>"){
1119 $gt = sq_findnxstr($body, $pos, ">");
1120 $retary = Array(false, false, false, $lt, $gt);
1124 return Array($tagname, false, $tagtype, $lt, $pos);
1128 * Check if it's whitespace
1130 if (!preg_match('/\s/', $match)){
1132 * This is an invalid tag! Look for the next closing ">".
1134 $gt = sq_findnxstr($body, $lt, ">");
1135 return Array(false, false, false, $lt, $gt);
1141 * At this point we're here:
1142 * <tagname attribute='blah'>
1145 * At this point we loop in order to find all attributes.
1151 while ($pos <= strlen($body)){
1152 $pos = sq_skipspace($body, $pos);
1153 if ($pos == strlen($body)){
1157 return Array(false, false, false, $lt, $pos);
1160 * See if we arrived at a ">" or "/>", which means that we reached
1161 * the end of the tag.
1164 if (preg_match("%^(\s*)(>|/>)%s", substr($body, $pos), $matches)) {
1168 $pos +
= strlen($matches{1});
1169 if ($matches{2} == "/>"){
1173 return Array($tagname, $attary, $tagtype, $lt, $pos);
1177 * There are several types of attributes, with optional
1178 * [:space:] between members.
1180 * attrname[:space:]=[:space:]'CDATA'
1182 * attrname[:space:]=[:space:]"CDATA"
1184 * attr[:space:]=[:space:]CDATA
1188 * We leave types 1 and 2 the same, type 3 we check for
1189 * '"' and convert to """ if needed, then wrap in
1190 * double quotes. Type 4 we convert into:
1193 $regary = sq_findnxreg($body, $pos, "[^:\w\-_]");
1194 if ($regary == false){
1196 * Looks like body ended before the end of tag.
1198 return Array(false, false, false, $lt, strlen($body));
1200 list($pos, $attname, $match) = $regary;
1201 $attname = strtolower($attname);
1203 * We arrived at the end of attribute name. Several things possible
1205 * '>' means the end of the tag and this is attribute type 4
1206 * '/' if followed by '>' means the same thing as above
1207 * '\s' means a lot of things -- look what it's followed by.
1208 * anything else means the attribute is invalid.
1213 * This is an xhtml-style tag with a closing / at the
1214 * end, like so: <img src="blah"/>. Check if it's followed
1215 * by the closing bracket. If not, then this tag is invalid
1217 if (substr($body, $pos, 2) == "/>"){
1221 $gt = sq_findnxstr($body, $pos, ">");
1222 $retary = Array(false, false, false, $lt, $gt);
1226 $attary{$attname} = '"yes"';
1227 return Array($tagname, $attary, $tagtype, $lt, $pos);
1231 * Skip whitespace and see what we arrive at.
1233 $pos = sq_skipspace($body, $pos);
1234 $char = substr($body, $pos, 1);
1236 * Two things are valid here:
1237 * '=' means this is attribute type 1 2 or 3.
1238 * \w means this was attribute type 4.
1239 * anything else we ignore and re-loop. End of tag and
1240 * invalid stuff will be caught by our checks at the beginning
1245 $pos = sq_skipspace($body, $pos);
1247 * Here are 3 possibilities:
1248 * "'" attribute type 1
1249 * '"' attribute type 2
1250 * everything else is the content of tag type 3
1252 $quot = substr($body, $pos, 1);
1254 $regary = sq_findnxreg($body, $pos+
1, "\'");
1255 if ($regary == false){
1256 return Array(false, false, false, $lt, strlen($body));
1258 list($pos, $attval, $match) = $regary;
1260 $attary{$attname} = "'" . $attval . "'";
1261 } else if ($quot == '"'){
1262 $regary = sq_findnxreg($body, $pos+
1, '\"');
1263 if ($regary == false){
1264 return Array(false, false, false, $lt, strlen($body));
1266 list($pos, $attval, $match) = $regary;
1268 $attary{$attname} = '"' . $attval . '"';
1271 * These are hateful. Look for \s, or >.
1273 $regary = sq_findnxreg($body, $pos, "[\s>]");
1274 if ($regary == false){
1275 return Array(false, false, false, $lt, strlen($body));
1277 list($pos, $attval, $match) = $regary;
1279 * If it's ">" it will be caught at the top.
1281 $attval = preg_replace("/\"/s", """, $attval);
1282 $attary{$attname} = '"' . $attval . '"';
1284 } else if (preg_match("|[\w/>]|", $char)) {
1286 * That was attribute type 4.
1288 $attary{$attname} = '"yes"';
1291 * An illegal character. Find next '>' and return.
1293 $gt = sq_findnxstr($body, $pos, ">");
1294 return Array(false, false, false, $lt, $gt);
1300 * The fact that we got here indicates that the tag end was never
1301 * found. Return invalid tag indication so it gets stripped.
1303 return Array(false, false, false, $lt, strlen($body));
1307 * This function checks attribute values for entity-encoded values
1308 * and returns them translated into 8-bit strings so we can run
1311 * @param $attvalue A string to run entity check against.
1312 * @return Translated value.
1315 function sq_deent($attvalue){
1318 * See if we have to run the checks first. All entities must start
1321 if (strpos($attvalue, '&') === false){
1325 * Check named entities first.
1327 $trans = get_html_translation_table(HTML_ENTITIES
);
1329 * Leave " in, as it can mess us up.
1331 $trans = array_flip($trans);
1332 unset($trans{'"'});
1333 while (list($ent, $val) = each($trans)){
1334 $attvalue = preg_replace('/' . $ent . '*/si', $val, $attvalue);
1337 * Now translate numbered entities from 1 to 255 if needed.
1339 if (strpos($attvalue, '#') !== false){
1340 $omit = Array(34, 39);
1341 for ($asc = 256; $asc >= 0; $asc--){
1342 if (!in_array($asc, $omit)){
1344 $octrule = '/\�*' . $asc . ';*/si';
1345 $hexrule = '/\�*' . dechex($asc) . ';*/si';
1346 $attvalue = preg_replace($octrule, $chr, $attvalue);
1347 $attvalue = preg_replace($hexrule, $chr, $attvalue);
1355 * This function runs various checks against the attributes.
1357 * @param $tagname String with the name of the tag.
1358 * @param $attary Array with all tag attributes.
1359 * @param $rm_attnames See description for sq_sanitize
1360 * @param $bad_attvals See description for sq_sanitize
1361 * @param $add_attr_to_tag See description for sq_sanitize
1362 * @param $message message object
1363 * @param $id message id
1364 * @return Array with modified attributes.
1366 function sq_fixatts($tagname,
1376 while (list($attname, $attvalue) = each($attary)){
1378 * See if this attribute should be removed.
1380 foreach ($rm_attnames as $matchtag=>$matchattrs){
1381 if (preg_match($matchtag, $tagname)){
1382 foreach ($matchattrs as $matchattr){
1383 if (preg_match($matchattr, $attname)){
1384 unset($attary{$attname});
1391 * Remove any backslashes, entities, and extraneous whitespace.
1393 $attvalue = sq_unbackslash($attvalue);
1394 $attvalue = sq_deent($attvalue);
1395 $attvalue = sq_unspace($attvalue);
1398 * Remove \r \n \t \0 " " "\\"
1400 $attvalue = str_replace(Array("\r", "\n", "\t", "\0", " ", "\\"),
1401 Array('', '','','','',''), $attvalue);
1404 * Now let's run checks on the attvalues.
1405 * I don't expect anyone to comprehend this. If you do,
1406 * get in touch with me so I can drive to where you live and
1407 * shake your hand personally. :)
1409 foreach ($bad_attvals as $matchtag=>$matchattrs){
1410 if (preg_match($matchtag, $tagname)){
1411 foreach ($matchattrs as $matchattr=>$valary){
1412 if (preg_match($matchattr, $attname)){
1414 * There are two arrays in valary.
1416 * Second one is replacements
1418 list($valmatch, $valrepl) = $valary;
1420 preg_replace($valmatch, $valrepl, $attvalue);
1421 if ($newvalue != $attvalue){
1422 $attary{$attname} = $newvalue;
1429 * Turn cid: urls into http-friendly ones.
1431 if (preg_match("/^[\'\"]\s*cid:/si", $attvalue)){
1432 $attary{$attname} = sq_cid2http($message, $id, $attvalue, $mailbox);
1436 * See if we need to append any attributes to this tag.
1438 foreach ($add_attr_to_tag as $matchtag=>$addattary){
1439 if (preg_match($matchtag, $tagname)){
1440 $attary = array_merge($attary, $addattary);
1447 * This function edits the style definition to make them friendly and
1448 * usable in squirrelmail.
1450 * @param $message the message object
1451 * @param $id the message id
1452 * @param $content a string with whatever is between <style> and </style>
1453 * @param $mailbox the message mailbox
1454 * @return a string with edited content.
1456 function sq_fixstyle($body, $pos, $message, $id, $mailbox){
1457 global $view_unsafe_images;
1458 $me = 'sq_fixstyle';
1459 $ret = sq_findnxreg($body, $pos, '</\s*style\s*>');
1461 return array(FALSE, strlen($body));
1463 $newpos = $ret[0] +
strlen($ret[2]);
1466 * First look for general BODY style declaration, which would be
1468 * body {background: blah-blah}
1469 * and change it to .bodyclass so we can just assign it to a <div>
1471 $content = preg_replace("|body(\s*\{.*?\})|si", ".bodyclass\\1", $content);
1472 $secremoveimg = '../images/' . _("sec_remove_eng.png");
1474 * Fix url('blah') declarations.
1476 $content = preg_replace("|url\s*\(\s*([\'\"])\s*\S+script\s*:.*?([\'\"])\s*\)|si",
1477 "url(\\1$secremoveimg\\2)", $content);
1479 * Fix url('https*://.*) declarations but only if $view_unsafe_images
1482 if (!$view_unsafe_images){
1483 $content = preg_replace("|url\s*\(\s*([\'\"])\s*https*:.*?([\'\"])\s*\)|si",
1484 "url(\\1$secremoveimg\\2)", $content);
1488 * Fix urls that refer to cid:
1490 while (preg_match("|url\s*\(\s*([\'\"]\s*cid:.*?[\'\"])\s*\)|si",
1491 $content, $matches)){
1492 $cidurl = $matches{1};
1493 $httpurl = sq_cid2http($message, $id, $cidurl, $mailbox);
1494 $content = preg_replace("|url\s*\(\s*$cidurl\s*\)|si",
1495 "url($httpurl)", $content);
1499 * Fix stupid css declarations which lead to vulnerabilities
1502 $match = Array('/expression/i',
1505 '/include-source/i');
1506 $replace = Array('idiocy', 'idiocy', 'idiocy', 'idiocy');
1507 $content = preg_replace($match, $replace, $content);
1508 return array($content, $newpos);
1512 * This function converts cid: url's into the ones that can be viewed in
1515 * @param $message the message object
1516 * @param $id the message id
1517 * @param $cidurl the cid: url.
1518 * @param $mailbox the message mailbox
1519 * @return a string with a http-friendly url
1521 function sq_cid2http($message, $id, $cidurl, $mailbox){
1523 * Get rid of quotes.
1525 $quotchar = substr($cidurl, 0, 1);
1526 if ($quotchar == '"' ||
$quotchar == "'"){
1527 $cidurl = str_replace($quotchar, "", $cidurl);
1531 $cidurl = substr(trim($cidurl), 4);
1532 $linkurl = find_ent_id($cidurl, $message);
1533 /* in case of non-save cid links $httpurl should be replaced by a sort of
1534 unsave link image */
1537 $httpurl = $quotchar . SM_PATH
. 'src/download.php?absolute_dl=true&' .
1538 "passed_id=$id&mailbox=" . urlencode($mailbox) .
1539 '&ent_id=' . $linkurl . $quotchar;
1545 * This function changes the <body> tag into a <div> tag since we
1546 * can't really have a body-within-body.
1548 * @param $attary an array of attributes and values of <body>
1549 * @param $mailbox mailbox we're currently reading (for cid2http)
1550 * @param $message current message (for cid2http)
1551 * @param $id current message id (for cid2http)
1552 * @return a modified array of attributes to be set for <div>
1554 function sq_body2div($attary, $mailbox, $message, $id){
1555 $me = 'sq_body2div';
1556 $divattary = Array('class' => "'bodyclass'");
1557 $bgcolor = '#ffffff';
1559 $has_bgc_stl = $has_txt_stl = false;
1561 if (is_array($attary) && sizeof($attary) > 0){
1562 foreach ($attary as $attname=>$attvalue){
1563 $quotchar = substr($attvalue, 0, 1);
1564 $attvalue = str_replace($quotchar, "", $attvalue);
1567 $attvalue = sq_cid2http($message, $id,
1568 $attvalue, $mailbox);
1569 $styledef .= "background-image: url('$attvalue'); ";
1572 $has_bgc_stl = true;
1573 $styledef .= "background-color: $attvalue; ";
1576 $has_txt_stl = true;
1577 $styledef .= "color: $attvalue; ";
1581 // Outlook defines a white bgcolor and no text color. This can lead to
1582 // white text on a white bg with certain themes.
1583 if ($has_bgc_stl && !$has_txt_stl) {
1584 $styledef .= "color: $text; ";
1586 if (strlen($styledef) > 0){
1587 $divattary{"style"} = "\"$styledef\"";
1594 * This is the main function and the one you should actually be calling.
1595 * There are several variables you should be aware of an which need
1596 * special description.
1598 * Since the description is quite lengthy, see it here:
1599 * http://www.mricon.com/html/phpfilter.html
1601 * @param $body the string with HTML you wish to filter
1602 * @param $tag_list see description above
1603 * @param $rm_tags_with_content see description above
1604 * @param $self_closing_tags see description above
1605 * @param $force_tag_closing see description above
1606 * @param $rm_attnames see description above
1607 * @param $bad_attvals see description above
1608 * @param $add_attr_to_tag see description above
1609 * @param $message message object
1610 * @param $id message id
1611 * @return sanitized html safe to show on your pages.
1613 function sq_sanitize($body,
1615 $rm_tags_with_content,
1625 $me = 'sq_sanitize';
1626 $rm_tags = array_shift($tag_list);
1628 * Normalize rm_tags and rm_tags_with_content.
1630 @array_walk
($tag_list, 'sq_casenormalize');
1631 @array_walk
($rm_tags_with_content, 'sq_casenormalize');
1632 @array_walk
($self_closing_tags, 'sq_casenormalize');
1634 * See if tag_list is of tags to remove or tags to allow.
1635 * false means remove these tags
1636 * true means allow these tags
1639 $open_tags = Array();
1640 $trusted = "\n<!-- begin sanitized html -->\n";
1641 $skip_content = false;
1643 * Take care of netscape's stupid javascript entities like
1646 $body = preg_replace("/&(\{.*?\};)/si", "&\\1", $body);
1648 while (($curtag = sq_getnxtag($body, $curpos)) != FALSE){
1649 list($tagname, $attary, $tagtype, $lt, $gt) = $curtag;
1650 $free_content = substr($body, $curpos, $lt-$curpos);
1652 * Take care of <style>
1654 if ($tagname == "style" && $tagtype == 1){
1655 list($free_content, $curpos) =
1656 sq_fixstyle($body, $gt+
1, $message, $id, $mailbox);
1657 if ($free_content != FALSE){
1658 $trusted .= sq_tagprint($tagname, $attary, $tagtype);
1659 $trusted .= $free_content;
1660 $trusted .= sq_tagprint($tagname, false, 2);
1664 if ($skip_content == false){
1665 $trusted .= $free_content;
1667 if ($tagname != FALSE){
1669 if ($skip_content == $tagname){
1671 * Got to the end of tag we needed to remove.
1674 $skip_content = false;
1676 if ($skip_content == false){
1677 if ($tagname == "body"){
1680 if (isset($open_tags{$tagname}) &&
1681 $open_tags{$tagname} > 0){
1682 $open_tags{$tagname}--;
1690 * $rm_tags_with_content
1692 if ($skip_content == false){
1694 * See if this is a self-closing type and change
1695 * tagtype appropriately.
1698 && in_array($tagname, $self_closing_tags)){
1702 * See if we should skip this tag and any content
1705 if ($tagtype == 1 &&
1706 in_array($tagname, $rm_tags_with_content)){
1707 $skip_content = $tagname;
1709 if (($rm_tags == false
1710 && in_array($tagname, $tag_list)) ||
1711 ($rm_tags == true &&
1712 !in_array($tagname, $tag_list))){
1716 * Convert body into div.
1718 if ($tagname == "body"){
1720 $attary = sq_body2div($attary, $mailbox,
1724 if (isset($open_tags{$tagname})){
1725 $open_tags{$tagname}++
;
1727 $open_tags{$tagname}=1;
1731 * This is where we run other checks.
1733 if (is_array($attary) && sizeof($attary) > 0){
1734 $attary = sq_fixatts($tagname,
1748 if ($tagname != false && $skip_content == false){
1749 $trusted .= sq_tagprint($tagname, $attary, $tagtype);
1754 $trusted .= substr($body, $curpos, strlen($body)-$curpos);
1755 if ($force_tag_closing == true){
1756 foreach ($open_tags as $tagname=>$opentimes){
1757 while ($opentimes > 0){
1758 $trusted .= '</' . $tagname . '>';
1764 $trusted .= "<!-- end sanitized html -->\n";
1769 * This is a wrapper function to call html sanitizing routines.
1771 * @param $body the body of the message
1772 * @param $id the id of the message
1773 * @return a string with html safe to display in the browser.
1775 function magicHTML($body, $id, $message, $mailbox = 'INBOX') {
1776 global $attachment_common_show_images, $view_unsafe_images,
1779 * Don't display attached images in HTML mode.
1781 $attachment_common_show_images = false;
1796 $rm_tags_with_content = Array(
1805 $self_closing_tags = Array(
1812 $force_tag_closing = true;
1814 $rm_attnames = Array(
1825 $secremoveimg = "../images/" . _("sec_remove_eng.png");
1826 $bad_attvals = Array(
1829 "/^src|background/i" =>
1832 "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
1833 "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
1834 "/^([\'\"])\s*about\s*:.*([\'\"])/si"
1837 "\\1$secremoveimg\\2",
1838 "\\1$secremoveimg\\2",
1839 "\\1$secremoveimg\\2",
1840 "\\1$secremoveimg\\2"
1843 "/^href|action/i" =>
1846 "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
1847 "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
1848 "/^([\'\"])\s*about\s*:.*([\'\"])/si"
1863 "/include-source/i",
1864 "/url\s*\(\s*([\'\"])\s*\S+script\s*:.*([\'\"])\s*\)/si",
1865 "/url\s*\(\s*([\'\"])\s*mocha\s*:.*([\'\"])\s*\)/si",
1866 "/url\s*\(\s*([\'\"])\s*about\s*:.*([\'\"])\s*\)/si",
1867 "/(.*)\s*:\s*url\s*\(\s*([\'\"]*)\s*\S+script\s*:.*([\'\"]*)\s*\)/si"
1883 if( !sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET
) ) {
1884 $view_unsafe_images = false;
1886 if (!$view_unsafe_images){
1888 * Remove any references to http/https if view_unsafe_images set
1891 array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[0],
1892 '/^([\'\"])\s*https*:.*([\'\"])/si');
1893 array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[1],
1894 "\\1$secremoveimg\\1");
1895 array_push($bad_attvals{'/.*/'}{'/^style/i'}[0],
1896 '/url\(([\'\"])\s*https*:.*([\'\"])\)/si');
1897 array_push($bad_attvals{'/.*/'}{'/^style/i'}[1],
1898 "url(\\1$secremoveimg\\1)");
1901 $add_attr_to_tag = Array(
1903 Array('target'=>'"_new"',
1904 'title'=>'"'._("This external link will open in a new window").'"'
1907 $trusted = sq_sanitize($body,
1909 $rm_tags_with_content,
1919 if (preg_match("|$secremoveimg|i", $trusted)){
1920 $has_unsafe_images = true;
1926 * function SendDownloadHeaders - send file to the browser
1928 * Original Source: SM core src/download.php
1929 * moved here to make it available to other code, and separate
1930 * front end from back end functionality.
1932 * @param string $type0 first half of mime type
1933 * @param string $type1 second half of mime type
1934 * @param string $filename filename to tell the browser for downloaded file
1935 * @param boolean $force whether to force the download dialog to pop
1936 * @param integer $filesize optional, send the Content-Header and length to the browser
1939 function SendDownloadHeaders($type0, $type1, $filename, $force, $filesize=0) {
1940 global $languages, $squirrelmail_language;
1943 sqgetGlobalVar('HTTP_USER_AGENT', $HTTP_USER_AGENT, SQ_SERVER
);
1945 if (strstr($HTTP_USER_AGENT, 'compatible; MSIE ') !== false &&
1946 strstr($HTTP_USER_AGENT, 'Opera') === false) {
1950 if (strstr($HTTP_USER_AGENT, 'compatible; MSIE 6') !== false &&
1951 strstr($HTTP_USER_AGENT, 'Opera') === false) {
1955 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
1956 function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) {
1958 $languages[$squirrelmail_language]['XTRA_CODE']('downloadfilename', $filename, $HTTP_USER_AGENT);
1960 $filename = ereg_replace('[\\/:\*\?"<>\|;]', '_', str_replace(' ', ' ', $filename));
1963 // A Pox on Microsoft and it's Office!
1965 // Try to show in browser window
1966 header("Content-Disposition: inline; filename=\"$filename\"");
1967 header("Content-Type: $type0/$type1; name=\"$filename\"");
1969 // Try to pop up the "save as" box
1970 // IE makes this hard. It pops up 2 save boxes, or none.
1971 // http://support.microsoft.com/support/kb/articles/Q238/5/88.ASP
1972 // But, accordint to Microsoft, it is "RFC compliant but doesn't
1973 // take into account some deviations that allowed within the
1974 // specification." Doesn't that mean RFC non-compliant?
1975 // http://support.microsoft.com/support/kb/articles/Q258/4/52.ASP
1977 // The best thing you can do for IE is to upgrade to the latest
1979 if ($isIE && !$isIE6) {
1980 // http://support.microsoft.com/support/kb/articles/Q182/3/15.asp
1981 // Do not have quotes around filename, but that applied to
1982 // "attachment"... does it apply to inline too?
1984 // This combination seems to work mostly. IE 5.5 SP 1 has
1985 // known issues (see the Microsoft Knowledge Base)
1986 header("Content-Disposition: inline; filename=$filename");
1987 // This works for most types, but doesn't work with Word files
1988 header("Content-Type: application/download; name=\"$filename\"");
1990 // These are spares, just in case. :-)
1991 //header("Content-Type: $type0/$type1; name=\"$filename\"");
1992 //header("Content-Type: application/x-msdownload; name=\"$filename\"");
1993 //header("Content-Type: application/octet-stream; name=\"$filename\"");
1995 header("Content-Disposition: attachment; filename=\"$filename\"");
1996 // application/octet-stream forces download for Netscape
1997 header("Content-Type: application/octet-stream; name=\"$filename\"");
2001 //send the content-length header if the calling function provides it
2002 if ($filesize > 0) {
2003 header("Content-Length: $filesize");
2006 } // end fn SendDownlaodHeaders