6 * Copyright (c) 1999-2005 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) {
100 /* Do a bit of error correction. If we couldn't find the entity id, just guess
101 * that it is the first one. That is usually the case anyway.
105 $cmd = "FETCH $id BODY[]";
107 $cmd = "FETCH $id BODY[$ent_id]";
110 if ($fetch_size!=0) $cmd .= "<0.$fetch_size>";
112 $data = sqimap_run_command ($imap_stream, $cmd, true, $response, $message, TRUE);
114 $topline = trim(array_shift($data));
115 } while($topline && ($topline[0] == '*') && !preg_match('/\* [0-9]+ FETCH.*/i', $topline)) ;
117 $wholemessage = implode('', $data);
118 if (ereg('\\{([^\\}]*)\\}', $topline, $regs)) {
119 $ret = substr($wholemessage, 0, $regs[1]);
120 /* There is some information in the content info header that could be important
121 * in order to parse html messages. Let's get them here.
123 // if ($ret{0} == '<') {
124 // $data = sqimap_run_command ($imap_stream, "FETCH $id BODY[$ent_id.MIME]", true, $response, $message, TRUE);
126 } else if (ereg('"([^"]*)"', $topline, $regs)) {
129 global $where, $what, $mailbox, $passed_id, $startMessage;
130 $par = 'mailbox=' . urlencode($mailbox) . '&passed_id=' . $passed_id;
131 if (isset($where) && isset($what)) {
132 $par .= '&where=' . urlencode($where) . '&what=' . urlencode($what);
134 $par .= '&startMessage=' . $startMessage . '&show_more=0';
136 $par .= '&response=' . urlencode($response) .
137 '&message=' . urlencode($message) .
138 '&topline=' . urlencode($topline);
141 '<table width="80%"><tr>' .
142 '<tr><td colspan="2">' .
143 _("Body retrieval error. The reason for this is most probably that the message is malformed.") .
145 '<tr><td><b>' . _("Command:") . "</td><td>$cmd</td></tr>" .
146 '<tr><td><b>' . _("Response:") . "</td><td>$response</td></tr>" .
147 '<tr><td><b>' . _("Message:") . "</td><td>$message</td></tr>" .
148 '<tr><td><b>' . _("FETCH line:") . "</td><td>$topline</td></tr>" .
149 "</table><br /></tt></font><hr />";
151 $data = sqimap_run_command ($imap_stream, "FETCH $passed_id BODY[]", true, $response, $message, TRUE);
153 $wholemessage = implode('', $data);
155 $ret = $wholemessage;
160 function mime_print_body_lines ($imap_stream, $id, $ent_id=1, $encoding) {
162 /* Don't kill the connection if the browser is over a dialup
163 * and it would take over 30 seconds to download it.
164 * Don't call set_time_limit in safe mode.
167 if (!ini_get('safe_mode')) {
170 /* in case of base64 encoded attachments, do not buffer them.
171 Instead, echo the decoded attachment directly to screen */
172 if (strtolower($encoding) == 'base64') {
174 $query = "FETCH $id BODY[]";
176 $query = "FETCH $id BODY[$ent_id]";
178 sqimap_run_command($imap_stream,$query,true,$response,$message,TRUE,'sqimap_base64_decode','php://stdout',true);
180 $body = mime_fetch_body ($imap_stream, $id, $ent_id);
181 echo decodeBody($body, $encoding);
185 TODO, use the same method for quoted printable.
186 However, I assume that quoted printable attachments aren't that large
187 so the performancegain / memory usage drop will be minimal.
188 If we decide to add that then we need to adapt sqimap_fread because
189 we need to split te result on \n and fread doesn't stop at \n. That
190 means we also should provide $results from sqimap_fread (by ref) to
191 te function and set $no_return to false. The $filter function for
192 quoted printable should handle unsetting of $results.
195 TODO 2: find out how we write to the output stream php://stdout. fwrite
196 doesn't work because 'php://stdout isn't a stream.
201 fputs ($imap_stream, "$sid FETCH $id BODY[$ent_id]\r\n");
204 $read = fgets ($imap_stream,8192);
207 // This could be bad -- if the section has sqimap_session_id() . ' OK'
208 // or similar, it will kill the download.
209 while (!ereg("^".$sid_s." (OK|BAD|NO)(.*)$", $read, $regs)) {
210 if (trim($read) == ')==') {
212 $read = fgets ($imap_stream,4096);
213 if (ereg("^".$sid." (OK|BAD|NO)(.*)$", $read, $regs)) {
216 echo decodeBody($read1, $encoding) .
217 decodeBody($read, $encoding);
220 echo decodeBody($read, $encoding);
222 $read = fgets ($imap_stream,4096);
229 /* -[ END MIME DECODING ]----------------------------------------------------------- */
231 /* This is here for debugging purposes. It will print out a list
232 * of all the entity IDs that are in the $message object.
234 function listEntities ($message) {
236 echo "<tt>" . $message->entity_id
. ' : ' . $message->type0
. '/' . $message->type1
. ' parent = '. $message->parent
->entity_id
. '<br />';
237 for ($i = 0; isset($message->entities
[$i]); $i++
) {
239 $msg = listEntities($message->entities
[$i]);
249 function getPriorityStr($priority) {
250 $priority_level = substr($priority,0,1);
252 switch($priority_level) {
253 /* Check for a higher then normal priority. */
256 $priority_string = _("High");
259 /* Check for a lower then normal priority. */
262 $priority_string = _("Low");
265 /* Check for a normal priority. */
268 $priority_level = '3';
269 $priority_string = _("Normal");
273 return $priority_string;
276 /* returns a $message object for a particular entity id */
277 function getEntity ($message, $ent_id) {
278 return $message->getEntity($ent_id);
282 * Extracted from strings.php 23/03/2002
285 function translateText(&$body, $wrap_at, $charset) {
286 global $where, $what; /* from searching */
287 global $color; /* color theme */
289 require_once(SM_PATH
. 'functions/url_parser.php');
291 $body_ary = explode("\n", $body);
292 for ($i=0; $i < count($body_ary); $i++
) {
293 $line = $body_ary[$i];
294 if (strlen($line) - 2 >= $wrap_at) {
295 sqWordWrap($line, $wrap_at, $charset);
297 $line = charset_decode($charset, $line);
298 $line = str_replace("\t", ' ', $line);
307 if ($line[$pos] == ' ') {
309 } else if (strpos($line, '>', $pos) === $pos) {
318 if (!isset($color[13])) {
319 $color[13] = '#800000';
321 $line = '<font color="' . $color[13] . '">' . $line . '</font>';
323 if (!isset($color[14])) {
324 $color[14] = '#FF0000';
326 $line = '<font color="' . $color[14] . '">' . $line . '</font>';
329 $body_ary[$i] = $line;
331 $body = '<pre>' . implode("\n", $body_ary) . '</pre>';
335 * This returns a parsed string called $body. That string can then
336 * be displayed as the actual message in the HTML. It contains
337 * everything needed, including HTML Tags, Attachments at the
339 * @param clean Do not output stuff that's irrelevant for the printable version.
341 function formatBody($imap_stream, $message, $color, $wrap_at, $ent_num, $id, $mailbox='INBOX', $clean=FALSE) {
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, $languages, $squirrelmail_language,
347 $show_html_default, $sort, $has_unsafe_images, $passed_ent_id;
349 if( !sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET
) ) {
350 $view_unsafe_images = false;
354 $urlmailbox = urlencode($mailbox);
355 $body_message = getEntity($message, $ent_num);
356 if (($body_message->header
->type0
== 'text') ||
357 ($body_message->header
->type0
== 'rfc822')) {
358 $body = mime_fetch_body ($imap_stream, $id, $ent_num);
359 $body = decodeBody($body, $body_message->header
->encoding
);
361 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
362 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_decode')) {
363 if (mb_detect_encoding($body) != 'ASCII') {
364 $body = call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_decode',$body);
367 $hookResults = do_hook("message_body", $body);
368 $body = $hookResults[1];
370 /* If there are other types that shouldn't be formatted, add
374 if ($body_message->header
->type1
== 'html') {
375 if ($show_html_default <> 1) {
376 $entity_conv = array(' ' => ' ',
385 $body = strtr($body, $entity_conv);
386 $body = strip_tags($body);
388 translateText($body, $wrap_at,
389 $body_message->header
->getParameter('charset'));
391 $body = magicHTML($body, $id, $message, $mailbox);
394 translateText($body, $wrap_at,
395 $body_message->header
->getParameter('charset'));
398 // if this is the clean display (i.e. printer friendly), stop here.
403 $link = 'passed_id=' . $id . '&ent_id='.$ent_num.
404 '&mailbox=' . $urlmailbox .'&sort=' . $sort .
405 '&startMessage=' . $startMessage . '&show_more=0';
406 if (isset($passed_ent_id)) {
407 $link .= '&passed_ent_id='.$passed_ent_id;
409 $body .= '<center><small><a href="download.php?absolute_dl=true&' .
410 $link . '">' . _("Download this as a file") . '</a>';
411 if ($view_unsafe_images) {
412 $text = _("Hide Unsafe Images");
414 if (isset($has_unsafe_images) && $has_unsafe_images) {
415 $link .= '&view_unsafe_images=1';
416 $text = _("View Unsafe Images");
422 $body .= ' | <a href="read_body.php?' . $link . '">' . $text . '</a>';
424 $body .= '</small></center><br />' . "\n";
430 function formatAttachments($message, $exclude_id, $mailbox, $id) {
431 global $where, $what, $startMessage, $color, $passed_ent_id;
433 $att_ar = $message->getAttachments($exclude_id);
435 if (!count($att_ar)) return '';
439 $urlMailbox = urlencode($mailbox);
441 foreach ($att_ar as $att) {
442 $ent = $att->entity_id
;
443 $header = $att->header
;
444 $type0 = strtolower($header->type0
);
445 $type1 = strtolower($header->type1
);
447 $links['download link']['text'] = _("Download");
448 $links['download link']['href'] = SM_PATH
.
449 "src/download.php?absolute_dl=true&passed_id=$id&mailbox=$urlMailbox&ent_id=$ent";
450 if ($type0 =='message' && $type1 == 'rfc822') {
451 $default_page = SM_PATH
. 'src/read_body.php';
452 $rfc822_header = $att->rfc822_header
;
453 $filename = $rfc822_header->subject
;
454 if (trim( $filename ) == '') {
455 $filename = 'untitled-[' . $ent . ']' ;
457 $from_o = $rfc822_header->from
;
458 if (is_object($from_o)) {
459 $from_name = decodeHeader($from_o->getAddress(false));
461 $from_name = _("Unknown sender");
463 $description = $from_name;
465 $default_page = SM_PATH
. 'src/download.php';
466 $filename = $att->getFilename();
467 if ($header->description
) {
468 $description = decodeHeader($header->description
);
474 $display_filename = $filename;
475 if (isset($passed_ent_id)) {
476 $passed_ent_id_link = '&passed_ent_id='.$passed_ent_id;
478 $passed_ent_id_link = '';
480 $defaultlink = $default_page . "?startMessage=$startMessage"
481 . "&passed_id=$id&mailbox=$urlMailbox"
482 . '&ent_id='.$ent.$passed_ent_id_link;
483 if ($where && $what) {
484 $defaultlink .= '&where='. urlencode($where).'&what='.urlencode($what);
487 /* This executes the attachment hook with a specific MIME-type.
488 * If that doesn't have results, it tries if there's a rule
489 * for a more generic type.
491 $hookresults = do_hook("attachment $type0/$type1", $links,
492 $startMessage, $id, $urlMailbox, $ent, $defaultlink,
493 $display_filename, $where, $what);
494 if(count($hookresults[1]) <= 1) {
495 $hookresults = do_hook("attachment $type0/*", $links,
496 $startMessage, $id, $urlMailbox, $ent, $defaultlink,
497 $display_filename, $where, $what);
500 $links = $hookresults[1];
501 $defaultlink = $hookresults[6];
503 $attachments .= '<tr><td>' .
504 '<a href="'.$defaultlink.'">'.decodeHeader($display_filename).'</a> </td>' .
505 '<td><small><b>' . show_readable_size($header->size
) .
506 '</b> </small></td>' .
507 '<td><small>[ '.htmlspecialchars($type0).'/'.htmlspecialchars($type1).' ] </small></td>' .
509 $attachments .= '<b>' . $description . '</b>';
510 $attachments .= '</small></td><td><small> ';
513 foreach ($links as $val) {
517 $attachments .= ' | ';
519 $attachments .= '<a href="' . $val['href'] . '">' . $val['text'] . '</a>';
522 $attachments .= "</td></tr>\n";
524 $attachmentadd = do_hook_function('attachments_bottom',$attachments);
525 if ($attachmentadd != '')
526 $attachments = $attachmentadd;
530 function sqimap_base64_decode(&$string) {
532 // Base64 encoded data goes in pairs of 4 bytes. To achieve on the
533 // fly decoding (to reduce memory usage) you have to check if the
534 // data has incomplete pairs
536 // Remove the noise in order to check if the 4 bytes pairs are complete
537 $string = str_replace(array("\r\n","\n", "\r", " "),array('','','',''),$string);
540 $iMod = strlen($string) %
4;
542 $sStringRem = substr($string,-$iMod);
543 // Check if $sStringRem contains padding characters
544 if (substr($sStringRem,-1) != '=') {
545 $string = substr($string,0,-$iMod);
550 $string = base64_decode($string);
555 /* This function decodes the body depending on the encoding type. */
556 function decodeBody($body, $encoding) {
557 global $show_html_default;
559 $body = str_replace("\r\n", "\n", $body);
560 $encoding = strtolower($encoding);
562 $encoding_handler = do_hook_function('decode_body', $encoding);
565 // plugins get first shot at decoding the body
567 if (!empty($encoding_handler) && function_exists($encoding_handler)) {
568 $body = $encoding_handler('decode', $body);
570 } else if ($encoding == 'quoted-printable' ||
571 $encoding == 'quoted_printable') {
572 $body = quoted_printable_decode($body);
574 while (ereg("=\n", $body)) {
575 $body = ereg_replace ("=\n", '', $body);
578 } else if ($encoding == 'base64') {
579 $body = base64_decode($body);
582 // All other encodings are returned raw.
589 * This functions decode strings that is encoded according to
590 * RFC1522 (MIME Part Two: Message Header Extensions for Non-ASCII Text).
591 * Patched by Christian Schmidt <christian@ostenfeld.dk> 23/03/2002
593 * @param string $string header string that has to be made readable
594 * @param boolean $utfencode change message in order to be readable on user's charset. defaults to true
595 * @param boolean $htmlsave preserve spaces and sanitize html special characters. defaults to true
596 * @param boolean $decide decide if string can be utfencoded. defaults to false
597 * @return string decoded header string
599 function decodeHeader ($string, $utfencode=true,$htmlsave=true,$decide=false) {
600 global $languages, $squirrelmail_language,$default_charset;
601 if (is_array($string)) {
602 $string = implode("\n", $string);
605 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
606 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_decodeheader')) {
607 $string = call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_decodeheader', $string);
608 // Do we need to return at this point?
615 $aString = explode(' ',$string);
617 foreach ($aString as $chunk) {
618 if ($encoded && $chunk === '') {
620 } elseif ($chunk === '') {
625 /* if encoded words are not separated by a linear-space-white we still catch them */
628 while ($match = preg_match('/^(.*)=\?([^?]*)\?(Q|B)\?([^?]*)\?=(.*)$/Ui',$chunk,$res)) {
629 /* if the last chunk isn't an encoded string then put back the space, otherwise don't */
630 if ($iLastMatch !== $j) {
640 $ret .= htmlspecialchars($res[1]);
644 $encoding = ucfirst($res[3]);
646 /* decide about valid decoding */
647 if ($decide && is_conversion_safe($res[2])) {
649 $can_be_encoded=true;
651 $can_be_encoded=false;
656 $replace = base64_decode($res[4]);
658 if ($can_be_encoded) {
659 /* convert string to different charset,
660 * if functions asks for it (usually in compose)
662 $ret .= charset_convert($res[2],$replace,$default_charset);
664 // convert string to html codes in order to display it
665 $ret .= charset_decode($res[2],$replace);
669 $replace = htmlspecialchars($replace);
675 $replace = str_replace('_', ' ', $res[4]);
676 $replace = preg_replace('/=([0-9a-f]{2})/ie', 'chr(hexdec("\1"))',
679 if ($can_be_encoded) {
680 /* convert string to different charset,
681 * if functions asks for it (usually in compose)
683 $replace = charset_convert($res[2], $replace,$default_charset);
685 // convert string to html codes in order to display it
686 $replace = charset_decode($res[2], $replace);
690 $replace = htmlspecialchars($replace);
709 if (!$encoded && $htmlsave) {
710 $ret .= htmlspecialchars($chunk);
716 /* remove the first added space */
719 $ret = substr($ret,5);
721 $ret = substr($ret,1);
729 * Encodes header as quoted-printable
731 * Encode a string according to RFC 1522 for use in headers if it
732 * contains 8-bit characters or anything that looks like it should
735 * @param string $string header string, that has to be encoded
736 * @return string quoted-printable encoded string
738 function encodeHeader ($string) {
739 global $default_charset, $languages, $squirrelmail_language;
741 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
742 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_encodeheader')) {
743 return call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_encodeheader', $string);
746 // Encode only if the string contains 8-bit characters or =?
747 $j = strlen($string);
748 $max_l = 75 - strlen($default_charset) - 7;
751 $iEncStart = $enc_init = false;
752 $cur_l = $iOffset = 0;
753 for($i = 0; $i < $j; ++
$i) {
762 if ($iEncStart === false) {
766 if ($cur_l > ($max_l-2)) {
767 /* if there is an stringpart that doesn't need encoding, add it */
768 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
769 $aRet[] = "=?$default_charset?Q?$ret?=";
775 $ret .= sprintf("=%02X",ord($string{$i}));
780 if ($iEncStart !== false) {
781 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
782 $aRet[] = "=?$default_charset?Q?$ret?=";
790 if ($iEncStart !== false) {
792 if ($cur_l > $max_l) {
793 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
794 $aRet[] = "=?$default_charset?Q?$ret?=";
805 $k = ord($string{$i});
807 if ($iEncStart === false) {
808 // do not start encoding in the middle of a string, also take the rest of the word.
809 $sLeadString = substr($string,0,$i);
810 $aLeadString = explode(' ',$sLeadString);
811 $sToBeEncoded = array_pop($aLeadString);
812 $iEncStart = $i - strlen($sToBeEncoded);
813 $ret .= $sToBeEncoded;
814 $cur_l +
= strlen($sToBeEncoded);
817 /* first we add the encoded string that reached it's max size */
818 if ($cur_l > ($max_l-2)) {
819 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
820 $aRet[] = "=?$default_charset?Q?$ret?= "; /* the next part is also encoded => separate by space */
827 $ret .= sprintf("=%02X", $k);
829 if ($iEncStart !== false) {
831 if ($cur_l > $max_l) {
832 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
833 $aRet[] = "=?$default_charset?Q?$ret?=";
848 if ($iEncStart !== false) {
849 $aRet[] = substr($string,$iOffset,$iEncStart-$iOffset);
850 $aRet[] = "=?$default_charset?Q?$ret?=";
852 $aRet[] = substr($string,$iOffset);
854 $string = implode('',$aRet);
859 /* This function trys to locate the entity_id of a specific mime element */
860 function find_ent_id($id, $message) {
861 for ($i = 0, $ret = ''; $ret == '' && $i < count($message->entities
); $i++
) {
862 if ($message->entities
[$i]->header
->type0
== 'multipart') {
863 $ret = find_ent_id($id, $message->entities
[$i]);
865 if (strcasecmp($message->entities
[$i]->header
->id
, $id) == 0) {
866 // if (sq_check_save_extension($message->entities[$i])) {
867 return $message->entities
[$i]->entity_id
;
875 function sq_check_save_extension($message) {
876 $filename = $message->getFilename();
877 $ext = substr($filename, strrpos($filename,'.')+
1);
878 $save_extensions = array('jpg','jpeg','gif','png','bmp');
879 return in_array($ext, $save_extensions);
884 ** HTMLFILTER ROUTINES
888 * This function is more or less a wrapper around stripslashes. Apparently
889 * Explorer is stupid enough to just remove the backslashes and then
890 * execute the content of the attribute as if nothing happened.
893 * @param attvalue The value of the attribute
894 * @return attvalue The value of the attribute stripslashed.
896 function sq_unbackslash($attvalue){
898 * Remove any backslashes. See if there are any first.
901 if (strstr($attvalue, '\\') !== false){
902 $attvalue = stripslashes($attvalue);
908 * Kill any tabs, newlines, or carriage returns. Our friends the
909 * makers of the browser with 95% market value decided that it'd
910 * be funny to make "java[tab]script" be just as good as "javascript".
912 * @param attvalue The attribute value before extraneous spaces removed.
913 * @return attvalue The attribute value after extraneous spaces removed.
915 function sq_unspace($attvalue){
916 if (strcspn($attvalue, "\t\r\n") != strlen($attvalue)){
917 $attvalue = str_replace(Array("\t", "\r", "\n"), Array('', '', ''),
924 * This function returns the final tag out of the tag name, an array
925 * of attributes, and the type of the tag. This function is called by
926 * sq_sanitize internally.
928 * @param $tagname the name of the tag.
929 * @param $attary the array of attributes and their values
930 * @param $tagtype The type of the tag (see in comments).
931 * @return a string with the final tag representation.
933 function sq_tagprint($tagname, $attary, $tagtype){
937 $fulltag = '</' . $tagname . '>';
939 $fulltag = '<' . $tagname;
940 if (is_array($attary) && sizeof($attary)){
942 while (list($attname, $attvalue) = each($attary)){
943 array_push($atts, "$attname=$attvalue");
945 $fulltag .= ' ' . join(" ", $atts);
956 * A small helper function to use with array_walk. Modifies a by-ref
957 * value and makes it lowercase.
959 * @param $val a value passed by-ref.
960 * @return void since it modifies a by-ref value.
962 function sq_casenormalize(&$val){
963 $val = strtolower($val);
967 * This function skips any whitespace from the current position within
968 * a string and to the next non-whitespace value.
970 * @param $body the string
971 * @param $offset the offset within the string where we should start
972 * looking for the next non-whitespace character.
973 * @return the location within the $body where the next
974 * non-whitespace char is located.
976 function sq_skipspace($body, $offset){
977 $me = 'sq_skipspace';
978 preg_match('/^(\s*)/s', substr($body, $offset), $matches);
979 if (sizeof($matches{1})){
980 $count = strlen($matches{1});
987 * This function looks for the next character within a string. It's
988 * really just a glorified "strpos", except it catches if failures
991 * @param $body The string to look for needle in.
992 * @param $offset Start looking from this position.
993 * @param $needle The character/string to look for.
994 * @return location of the next occurance of the needle, or
995 * strlen($body) if needle wasn't found.
997 function sq_findnxstr($body, $offset, $needle){
998 $me = 'sq_findnxstr';
999 $pos = strpos($body, $needle, $offset);
1000 if ($pos === FALSE){
1001 $pos = strlen($body);
1007 * This function takes a PCRE-style regexp and tries to match it
1008 * within the string.
1010 * @param $body The string to look for needle in.
1011 * @param $offset Start looking from here.
1012 * @param $reg A PCRE-style regex to match.
1013 * @return Returns a false if no matches found, or an array
1014 * with the following members:
1015 * - integer with the location of the match within $body
1016 * - string with whatever content between offset and the match
1017 * - string with whatever it is we matched
1019 function sq_findnxreg($body, $offset, $reg){
1020 $me = 'sq_findnxreg';
1023 preg_match("%^(.*?)($reg)%si", substr($body, $offset), $matches);
1024 if (!isset($matches{0}) ||
!$matches{0}){
1027 $retarr{0} = $offset +
strlen($matches{1});
1028 $retarr{1} = $matches{1};
1029 $retarr{2} = $matches{2};
1035 * This function looks for the next tag.
1037 * @param $body String where to look for the next tag.
1038 * @param $offset Start looking from here.
1039 * @return false if no more tags exist in the body, or
1040 * an array with the following members:
1041 * - string with the name of the tag
1042 * - array with attributes and their values
1043 * - integer with tag type (1, 2, or 3)
1044 * - integer where the tag starts (starting "<")
1045 * - integer where the tag ends (ending ">")
1046 * first three members will be false, if the tag is invalid.
1048 function sq_getnxtag($body, $offset){
1049 $me = 'sq_getnxtag';
1050 if ($offset > strlen($body)){
1053 $lt = sq_findnxstr($body, $offset, "<");
1054 if ($lt == strlen($body)){
1059 * blah blah <tag attribute="value">
1062 $pos = sq_skipspace($body, $lt+
1);
1063 if ($pos >= strlen($body)){
1064 return Array(false, false, false, $lt, strlen($body));
1067 * There are 3 kinds of tags:
1068 * 1. Opening tag, e.g.:
1070 * 2. Closing tag, e.g.:
1072 * 3. XHTML-style content-less tag, e.g.:
1073 * <img src="blah" />
1076 switch (substr($body, $pos, 1)){
1083 * A comment or an SGML declaration.
1085 if (substr($body, $pos+
1, 2) == "--"){
1086 $gt = strpos($body, "-->", $pos);
1088 $gt = strlen($body);
1092 return Array(false, false, false, $lt, $gt);
1094 $gt = sq_findnxstr($body, $pos, ">");
1095 return Array(false, false, false, $lt, $gt);
1100 * Assume tagtype 1 for now. If it's type 3, we'll switch values
1109 * Look for next [\W-_], which will indicate the end of the tag name.
1111 $regary = sq_findnxreg($body, $pos, "[^\w\-_]");
1112 if ($regary == false){
1113 return Array(false, false, false, $lt, strlen($body));
1115 list($pos, $tagname, $match) = $regary;
1116 $tagname = strtolower($tagname);
1119 * $match can be either of these:
1120 * '>' indicating the end of the tag entirely.
1121 * '\s' indicating the end of the tag name.
1122 * '/' indicating that this is type-3 xhtml tag.
1124 * Whatever else we find there indicates an invalid tag.
1129 * This is an xhtml-style tag with a closing / at the
1130 * end, like so: <img src="blah" />. Check if it's followed
1131 * by the closing bracket. If not, then this tag is invalid
1133 if (substr($body, $pos, 2) == "/>"){
1137 $gt = sq_findnxstr($body, $pos, ">");
1138 $retary = Array(false, false, false, $lt, $gt);
1142 return Array($tagname, false, $tagtype, $lt, $pos);
1146 * Check if it's whitespace
1148 if (!preg_match('/\s/', $match)){
1150 * This is an invalid tag! Look for the next closing ">".
1152 $gt = sq_findnxstr($body, $lt, ">");
1153 return Array(false, false, false, $lt, $gt);
1159 * At this point we're here:
1160 * <tagname attribute='blah'>
1163 * At this point we loop in order to find all attributes.
1168 while ($pos <= strlen($body)){
1169 $pos = sq_skipspace($body, $pos);
1170 if ($pos == strlen($body)){
1174 return Array(false, false, false, $lt, $pos);
1177 * See if we arrived at a ">" or "/>", which means that we reached
1178 * the end of the tag.
1181 if (preg_match("%^(\s*)(>|/>)%s", substr($body, $pos), $matches)) {
1185 $pos +
= strlen($matches{1});
1186 if ($matches{2} == "/>"){
1190 return Array($tagname, $attary, $tagtype, $lt, $pos);
1194 * There are several types of attributes, with optional
1195 * [:space:] between members.
1197 * attrname[:space:]=[:space:]'CDATA'
1199 * attrname[:space:]=[:space:]"CDATA"
1201 * attr[:space:]=[:space:]CDATA
1205 * We leave types 1 and 2 the same, type 3 we check for
1206 * '"' and convert to """ if needed, then wrap in
1207 * double quotes. Type 4 we convert into:
1210 $regary = sq_findnxreg($body, $pos, "[^:\w\-_]");
1211 if ($regary == false){
1213 * Looks like body ended before the end of tag.
1215 return Array(false, false, false, $lt, strlen($body));
1217 list($pos, $attname, $match) = $regary;
1218 $attname = strtolower($attname);
1220 * We arrived at the end of attribute name. Several things possible
1222 * '>' means the end of the tag and this is attribute type 4
1223 * '/' if followed by '>' means the same thing as above
1224 * '\s' means a lot of things -- look what it's followed by.
1225 * anything else means the attribute is invalid.
1230 * This is an xhtml-style tag with a closing / at the
1231 * end, like so: <img src="blah" />. Check if it's followed
1232 * by the closing bracket. If not, then this tag is invalid
1234 if (substr($body, $pos, 2) == "/>"){
1238 $gt = sq_findnxstr($body, $pos, ">");
1239 $retary = Array(false, false, false, $lt, $gt);
1243 $attary{$attname} = '"yes"';
1244 return Array($tagname, $attary, $tagtype, $lt, $pos);
1248 * Skip whitespace and see what we arrive at.
1250 $pos = sq_skipspace($body, $pos);
1251 $char = substr($body, $pos, 1);
1253 * Two things are valid here:
1254 * '=' means this is attribute type 1 2 or 3.
1255 * \w means this was attribute type 4.
1256 * anything else we ignore and re-loop. End of tag and
1257 * invalid stuff will be caught by our checks at the beginning
1262 $pos = sq_skipspace($body, $pos);
1264 * Here are 3 possibilities:
1265 * "'" attribute type 1
1266 * '"' attribute type 2
1267 * everything else is the content of tag type 3
1269 $quot = substr($body, $pos, 1);
1271 $regary = sq_findnxreg($body, $pos+
1, "\'");
1272 if ($regary == false){
1273 return Array(false, false, false, $lt, strlen($body));
1275 list($pos, $attval, $match) = $regary;
1277 $attary{$attname} = "'" . $attval . "'";
1278 } else if ($quot == '"'){
1279 $regary = sq_findnxreg($body, $pos+
1, '\"');
1280 if ($regary == false){
1281 return Array(false, false, false, $lt, strlen($body));
1283 list($pos, $attval, $match) = $regary;
1285 $attary{$attname} = '"' . $attval . '"';
1288 * These are hateful. Look for \s, or >.
1290 $regary = sq_findnxreg($body, $pos, "[\s>]");
1291 if ($regary == false){
1292 return Array(false, false, false, $lt, strlen($body));
1294 list($pos, $attval, $match) = $regary;
1296 * If it's ">" it will be caught at the top.
1298 $attval = preg_replace("/\"/s", """, $attval);
1299 $attary{$attname} = '"' . $attval . '"';
1301 } else if (preg_match("|[\w/>]|", $char)) {
1303 * That was attribute type 4.
1305 $attary{$attname} = '"yes"';
1308 * An illegal character. Find next '>' and return.
1310 $gt = sq_findnxstr($body, $pos, ">");
1311 return Array(false, false, false, $lt, $gt);
1317 * The fact that we got here indicates that the tag end was never
1318 * found. Return invalid tag indication so it gets stripped.
1320 return Array(false, false, false, $lt, strlen($body));
1324 * This function checks attribute values for entity-encoded values
1325 * and returns them translated into 8-bit strings so we can run
1328 * @param $attvalue A string to run entity check against.
1329 * @return Translated value.
1332 function sq_deent($attvalue){
1335 * See if we have to run the checks first. All entities must start
1338 if (strpos($attvalue, '&') === false){
1342 * Check named entities first.
1344 $trans = get_html_translation_table(HTML_ENTITIES
);
1346 * Leave " in, as it can mess us up.
1348 $trans = array_flip($trans);
1349 unset($trans{'"'});
1350 while (list($ent, $val) = each($trans)){
1351 $attvalue = preg_replace('/' . $ent . '*/si', $val, $attvalue);
1354 * Now translate numbered entities from 1 to 255 if needed.
1356 if (strpos($attvalue, '#') !== false){
1357 $omit = Array(34, 39);
1358 for ($asc = 256; $asc >= 0; $asc--){
1359 if (!in_array($asc, $omit)){
1361 $octrule = '/\�*' . $asc . ';*/si';
1362 $hexrule = '/\�*' . dechex($asc) . ';*/si';
1363 $attvalue = preg_replace($octrule, $chr, $attvalue);
1364 $attvalue = preg_replace($hexrule, $chr, $attvalue);
1372 * This function runs various checks against the attributes.
1374 * @param $tagname String with the name of the tag.
1375 * @param $attary Array with all tag attributes.
1376 * @param $rm_attnames See description for sq_sanitize
1377 * @param $bad_attvals See description for sq_sanitize
1378 * @param $add_attr_to_tag See description for sq_sanitize
1379 * @param $message message object
1380 * @param $id message id
1381 * @return Array with modified attributes.
1383 function sq_fixatts($tagname,
1393 while (list($attname, $attvalue) = each($attary)){
1395 * See if this attribute should be removed.
1397 foreach ($rm_attnames as $matchtag=>$matchattrs){
1398 if (preg_match($matchtag, $tagname)){
1399 foreach ($matchattrs as $matchattr){
1400 if (preg_match($matchattr, $attname)){
1401 unset($attary{$attname});
1408 * Remove any backslashes, entities, and extraneous whitespace.
1410 $attvalue = sq_unbackslash($attvalue);
1411 $attvalue = sq_deent($attvalue);
1412 $attvalue = sq_unspace($attvalue);
1415 * Remove \r \n \t \0 " " "\\"
1417 $attvalue = str_replace(Array("\r", "\n", "\t", "\0", " ", "\\"),
1418 Array('', '','','','',''), $attvalue);
1421 * Now let's run checks on the attvalues.
1422 * I don't expect anyone to comprehend this. If you do,
1423 * get in touch with me so I can drive to where you live and
1424 * shake your hand personally. :)
1426 foreach ($bad_attvals as $matchtag=>$matchattrs){
1427 if (preg_match($matchtag, $tagname)){
1428 foreach ($matchattrs as $matchattr=>$valary){
1429 if (preg_match($matchattr, $attname)){
1431 * There are two arrays in valary.
1433 * Second one is replacements
1435 list($valmatch, $valrepl) = $valary;
1437 preg_replace($valmatch, $valrepl, $attvalue);
1438 if ($newvalue != $attvalue){
1439 $attary{$attname} = $newvalue;
1446 * Turn cid: urls into http-friendly ones.
1448 if (preg_match("/^[\'\"]\s*cid:/si", $attvalue)){
1449 $attary{$attname} = sq_cid2http($message, $id, $attvalue, $mailbox);
1453 * See if we need to append any attributes to this tag.
1455 foreach ($add_attr_to_tag as $matchtag=>$addattary){
1456 if (preg_match($matchtag, $tagname)){
1457 $attary = array_merge($attary, $addattary);
1464 * This function edits the style definition to make them friendly and
1465 * usable in SquirrelMail.
1467 * @param $message the message object
1468 * @param $id the message id
1469 * @param $content a string with whatever is between <style> and </style>
1470 * @param $mailbox the message mailbox
1471 * @return a string with edited content.
1473 function sq_fixstyle($body, $pos, $message, $id, $mailbox){
1474 global $view_unsafe_images;
1475 $me = 'sq_fixstyle';
1476 $ret = sq_findnxreg($body, $pos, '</\s*style\s*>');
1478 return array(FALSE, strlen($body));
1480 $newpos = $ret[0] +
strlen($ret[2]);
1483 * First look for general BODY style declaration, which would be
1485 * body {background: blah-blah}
1486 * and change it to .bodyclass so we can just assign it to a <div>
1488 $content = preg_replace("|body(\s*\{.*?\})|si", ".bodyclass\\1", $content);
1489 $secremoveimg = '../images/' . _("sec_remove_eng.png");
1491 * Fix url('blah') declarations.
1493 $content = preg_replace("|url\s*\(\s*([\'\"])\s*\S+script\s*:.*?([\'\"])\s*\)|si",
1494 "url(\\1$secremoveimg\\2)", $content);
1496 * Fix url('https*://.*) declarations but only if $view_unsafe_images
1499 if (!$view_unsafe_images){
1500 $content = preg_replace("|url\s*\(\s*([\'\"])\s*https*:.*?([\'\"])\s*\)|si",
1501 "url(\\1$secremoveimg\\2)", $content);
1505 * Fix urls that refer to cid:
1507 while (preg_match("|url\s*\(\s*([\'\"]\s*cid:.*?[\'\"])\s*\)|si",
1508 $content, $matches)){
1509 $cidurl = $matches{1};
1510 $httpurl = sq_cid2http($message, $id, $cidurl, $mailbox);
1511 $content = preg_replace("|url\s*\(\s*$cidurl\s*\)|si",
1512 "url($httpurl)", $content);
1516 * Fix stupid css declarations which lead to vulnerabilities
1519 $match = Array('/expression/i',
1522 '/include-source/i');
1523 $replace = Array('idiocy', 'idiocy', 'idiocy', 'idiocy');
1524 $content = preg_replace($match, $replace, $content);
1525 return array($content, $newpos);
1529 * This function converts cid: url's into the ones that can be viewed in
1532 * @param $message the message object
1533 * @param $id the message id
1534 * @param $cidurl the cid: url.
1535 * @param $mailbox the message mailbox
1536 * @return a string with a http-friendly url
1538 function sq_cid2http($message, $id, $cidurl, $mailbox){
1540 * Get rid of quotes.
1542 $quotchar = substr($cidurl, 0, 1);
1543 if ($quotchar == '"' ||
$quotchar == "'"){
1544 $cidurl = str_replace($quotchar, "", $cidurl);
1548 $cidurl = substr(trim($cidurl), 4);
1549 $linkurl = find_ent_id($cidurl, $message);
1550 /* in case of non-save cid links $httpurl should be replaced by a sort of
1551 unsave link image */
1554 $httpurl = $quotchar . SM_PATH
. 'src/download.php?absolute_dl=true&' .
1555 "passed_id=$id&mailbox=" . urlencode($mailbox) .
1556 '&ent_id=' . $linkurl . $quotchar;
1562 * This function changes the <body> tag into a <div> tag since we
1563 * can't really have a body-within-body.
1565 * @param $attary an array of attributes and values of <body>
1566 * @param $mailbox mailbox we're currently reading (for cid2http)
1567 * @param $message current message (for cid2http)
1568 * @param $id current message id (for cid2http)
1569 * @return a modified array of attributes to be set for <div>
1571 function sq_body2div($attary, $mailbox, $message, $id){
1572 $me = 'sq_body2div';
1573 $divattary = Array('class' => "'bodyclass'");
1575 $has_bgc_stl = $has_txt_stl = false;
1577 if (is_array($attary) && sizeof($attary) > 0){
1578 foreach ($attary as $attname=>$attvalue){
1579 $quotchar = substr($attvalue, 0, 1);
1580 $attvalue = str_replace($quotchar, "", $attvalue);
1583 $attvalue = sq_cid2http($message, $id,
1584 $attvalue, $mailbox);
1585 $styledef .= "background-image: url('$attvalue'); ";
1588 $has_bgc_stl = true;
1589 $styledef .= "background-color: $attvalue; ";
1592 $has_txt_stl = true;
1593 $styledef .= "color: $attvalue; ";
1597 // Outlook defines a white bgcolor and no text color. This can lead to
1598 // white text on a white bg with certain themes.
1599 if ($has_bgc_stl && !$has_txt_stl) {
1600 $styledef .= "color: $text; ";
1602 if (strlen($styledef) > 0){
1603 $divattary{"style"} = "\"$styledef\"";
1610 * This is the main function and the one you should actually be calling.
1611 * There are several variables you should be aware of an which need
1612 * special description.
1614 * Since the description is quite lengthy, see it here:
1615 * http://linux.duke.edu/projects/mini/htmlfilter/
1617 * @param $body the string with HTML you wish to filter
1618 * @param $tag_list see description above
1619 * @param $rm_tags_with_content see description above
1620 * @param $self_closing_tags see description above
1621 * @param $force_tag_closing see description above
1622 * @param $rm_attnames see description above
1623 * @param $bad_attvals see description above
1624 * @param $add_attr_to_tag see description above
1625 * @param $message message object
1626 * @param $id message id
1627 * @return sanitized html safe to show on your pages.
1629 function sq_sanitize($body,
1631 $rm_tags_with_content,
1641 $me = 'sq_sanitize';
1642 $rm_tags = array_shift($tag_list);
1644 * Normalize rm_tags and rm_tags_with_content.
1646 @array_walk
($tag_list, 'sq_casenormalize');
1647 @array_walk
($rm_tags_with_content, 'sq_casenormalize');
1648 @array_walk
($self_closing_tags, 'sq_casenormalize');
1650 * See if tag_list is of tags to remove or tags to allow.
1651 * false means remove these tags
1652 * true means allow these tags
1655 $open_tags = Array();
1656 $trusted = "\n<!-- begin sanitized html -->\n";
1657 $skip_content = false;
1659 * Take care of netscape's stupid javascript entities like
1662 $body = preg_replace("/&(\{.*?\};)/si", "&\\1", $body);
1664 while (($curtag = sq_getnxtag($body, $curpos)) != FALSE){
1665 list($tagname, $attary, $tagtype, $lt, $gt) = $curtag;
1666 $free_content = substr($body, $curpos, $lt-$curpos);
1668 * Take care of <style>
1670 if ($tagname == "style" && $tagtype == 1){
1671 list($free_content, $curpos) =
1672 sq_fixstyle($body, $gt+
1, $message, $id, $mailbox);
1673 if ($free_content != FALSE){
1674 $trusted .= sq_tagprint($tagname, $attary, $tagtype);
1675 $trusted .= $free_content;
1676 $trusted .= sq_tagprint($tagname, false, 2);
1680 if ($skip_content == false){
1681 $trusted .= $free_content;
1683 if ($tagname != FALSE){
1685 if ($skip_content == $tagname){
1687 * Got to the end of tag we needed to remove.
1690 $skip_content = false;
1692 if ($skip_content == false){
1693 if ($tagname == "body"){
1696 if (isset($open_tags{$tagname}) &&
1697 $open_tags{$tagname} > 0){
1698 $open_tags{$tagname}--;
1706 * $rm_tags_with_content
1708 if ($skip_content == false){
1710 * See if this is a self-closing type and change
1711 * tagtype appropriately.
1714 && in_array($tagname, $self_closing_tags)){
1718 * See if we should skip this tag and any content
1721 if ($tagtype == 1 &&
1722 in_array($tagname, $rm_tags_with_content)){
1723 $skip_content = $tagname;
1725 if (($rm_tags == false
1726 && in_array($tagname, $tag_list)) ||
1727 ($rm_tags == true &&
1728 !in_array($tagname, $tag_list))){
1732 * Convert body into div.
1734 if ($tagname == "body"){
1736 $attary = sq_body2div($attary, $mailbox,
1740 if (isset($open_tags{$tagname})){
1741 $open_tags{$tagname}++
;
1743 $open_tags{$tagname}=1;
1747 * This is where we run other checks.
1749 if (is_array($attary) && sizeof($attary) > 0){
1750 $attary = sq_fixatts($tagname,
1764 if ($tagname != false && $skip_content == false){
1765 $trusted .= sq_tagprint($tagname, $attary, $tagtype);
1770 $trusted .= substr($body, $curpos, strlen($body)-$curpos);
1771 if ($force_tag_closing == true){
1772 foreach ($open_tags as $tagname=>$opentimes){
1773 while ($opentimes > 0){
1774 $trusted .= '</' . $tagname . '>';
1780 $trusted .= "<!-- end sanitized html -->\n";
1785 * This is a wrapper function to call html sanitizing routines.
1787 * @param $body the body of the message
1788 * @param $id the id of the message
1789 * @return a string with html safe to display in the browser.
1791 function magicHTML($body, $id, $message, $mailbox = 'INBOX') {
1792 global $attachment_common_show_images, $view_unsafe_images,
1795 * Don't display attached images in HTML mode.
1797 $attachment_common_show_images = false;
1812 $rm_tags_with_content = Array(
1821 $self_closing_tags = Array(
1828 $force_tag_closing = true;
1830 $rm_attnames = Array(
1841 $secremoveimg = "../images/" . _("sec_remove_eng.png");
1842 $bad_attvals = Array(
1845 "/^src|background/i" =>
1848 "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
1849 "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
1850 "/^([\'\"])\s*about\s*:.*([\'\"])/si"
1853 "\\1$secremoveimg\\2",
1854 "\\1$secremoveimg\\2",
1855 "\\1$secremoveimg\\2",
1856 "\\1$secremoveimg\\2"
1859 "/^href|action/i" =>
1862 "/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
1863 "/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
1864 "/^([\'\"])\s*about\s*:.*([\'\"])/si"
1879 "/include-source/i",
1880 "/url\s*\(\s*([\'\"])\s*\S+script\s*:.*([\'\"])\s*\)/si",
1881 "/url\s*\(\s*([\'\"])\s*mocha\s*:.*([\'\"])\s*\)/si",
1882 "/url\s*\(\s*([\'\"])\s*about\s*:.*([\'\"])\s*\)/si",
1883 "/(.*)\s*:\s*url\s*\(\s*([\'\"]*)\s*\S+script\s*:.*([\'\"]*)\s*\)/si"
1899 if( !sqgetGlobalVar('view_unsafe_images', $view_unsafe_images, SQ_GET
) ) {
1900 $view_unsafe_images = false;
1902 if (!$view_unsafe_images){
1904 * Remove any references to http/https if view_unsafe_images set
1907 array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[0],
1908 '/^([\'\"])\s*https*:.*([\'\"])/si');
1909 array_push($bad_attvals{'/.*/'}{'/^src|background/i'}[1],
1910 "\\1$secremoveimg\\1");
1911 array_push($bad_attvals{'/.*/'}{'/^style/i'}[0],
1912 '/url\(([\'\"])\s*https*:.*([\'\"])\)/si');
1913 array_push($bad_attvals{'/.*/'}{'/^style/i'}[1],
1914 "url(\\1$secremoveimg\\1)");
1917 $add_attr_to_tag = Array(
1919 Array('target'=>'"_new"',
1920 'title'=>'"'._("This external link will open in a new window").'"'
1923 $trusted = sq_sanitize($body,
1925 $rm_tags_with_content,
1935 if (preg_match("|$secremoveimg|i", $trusted)){
1936 $has_unsafe_images = true;
1942 * function SendDownloadHeaders - send file to the browser
1944 * Original Source: SM core src/download.php
1945 * moved here to make it available to other code, and separate
1946 * front end from back end functionality.
1948 * @param string $type0 first half of mime type
1949 * @param string $type1 second half of mime type
1950 * @param string $filename filename to tell the browser for downloaded file
1951 * @param boolean $force whether to force the download dialog to pop
1952 * @param optional integer $filesize send the Content-Header and length to the browser
1955 function SendDownloadHeaders($type0, $type1, $filename, $force, $filesize=0) {
1956 global $languages, $squirrelmail_language;
1959 sqgetGlobalVar('HTTP_USER_AGENT', $HTTP_USER_AGENT, SQ_SERVER
);
1961 if (strstr($HTTP_USER_AGENT, 'compatible; MSIE ') !== false &&
1962 strstr($HTTP_USER_AGENT, 'Opera') === false) {
1966 if (strstr($HTTP_USER_AGENT, 'compatible; MSIE 6') !== false &&
1967 strstr($HTTP_USER_AGENT, 'Opera') === false) {
1971 if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
1972 function_exists($languages[$squirrelmail_language]['XTRA_CODE'] . '_downloadfilename')) {
1974 call_user_func($languages[$squirrelmail_language]['XTRA_CODE'] . '_downloadfilename', $filename, $HTTP_USER_AGENT);
1976 $filename = ereg_replace('[\\/:\*\?"<>\|;]', '_', str_replace(' ', ' ', $filename));
1979 // A Pox on Microsoft and it's Internet Explorer!
1981 // IE has lots of bugs with file downloads.
1982 // It also has problems with SSL. Both of these cause problems
1983 // for us in this function.
1985 // See this article on Cache Control headers and SSL
1986 // http://support.microsoft.com/default.aspx?scid=kb;en-us;323308
1988 // The best thing you can do for IE is to upgrade to the latest
1990 //set all the Cache Control Headers for IE
1992 $filename=rawurlencode($filename);
1993 header ("Pragma: public");
1994 header ("Cache-Control: no-store, max-age=0, no-cache, must-revalidate"); # HTTP/1.1
1995 header ("Cache-Control: post-check=0, pre-check=0", false);
1996 header ("Cache-control: private");
1998 //set the inline header for IE, we'll add the attachment header later if we need it
1999 header ("Content-Disposition: inline; filename=$filename");
2003 // Try to show in browser window
2004 header ("Content-Disposition: inline; filename=\"$filename\"");
2005 header ("Content-Type: $type0/$type1; name=\"$filename\"");
2007 // Try to pop up the "save as" box
2009 // IE makes this hard. It pops up 2 save boxes, or none.
2010 // http://support.microsoft.com/support/kb/articles/Q238/5/88.ASP
2011 // http://support.microsoft.com/default.aspx?scid=kb;EN-US;260519
2012 // But, according to Microsoft, it is "RFC compliant but doesn't
2013 // take into account some deviations that allowed within the
2014 // specification." Doesn't that mean RFC non-compliant?
2015 // http://support.microsoft.com/support/kb/articles/Q258/4/52.ASP
2017 // all browsers need the application/octet-stream header for this
2018 header ("Content-Type: application/octet-stream; name=\"$filename\"");
2020 // http://support.microsoft.com/support/kb/articles/Q182/3/15.asp
2021 // Do not have quotes around filename, but that applied to
2022 // "attachment"... does it apply to inline too?
2023 header ("Content-Disposition: attachment; filename=\"$filename\"");
2025 if ($isIE && !$isIE6) {
2026 // This combination seems to work mostly. IE 5.5 SP 1 has
2027 // known issues (see the Microsoft Knowledge Base)
2029 // This works for most types, but doesn't work with Word files
2030 header ("Content-Type: application/download; name=\"$filename\"");
2032 // These are spares, just in case. :-)
2033 //header("Content-Type: $type0/$type1; name=\"$filename\"");
2034 //header("Content-Type: application/x-msdownload; name=\"$filename\"");
2035 //header("Content-Type: application/octet-stream; name=\"$filename\"");
2037 // another application/octet-stream forces download for Netscape
2038 header ("Content-Type: application/octet-stream; name=\"$filename\"");
2042 //send the content-length header if the calling function provides it
2043 if ($filesize > 0) {
2044 header("Content-Length: $filesize");
2047 } // end fn SendDownloadHeaders