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<?php
/**
* url_parser.php
*
* This code provides various string manipulation functions that are
* used by the rest of the SquirrelMail code.
*
* @copyright 1999-2010 The SquirrelMail Project Team
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
* @version $Id: url_parser.php 13893 2010-01-25 02:47:41Z pdontthink $
* @package squirrelmail
*/
/**
* Undocumented - complain, then patch.
*/
function replaceBlock (&$in, $replace, $start, $end) {
$begin = substr($in,0,$start);
$end = substr($in,$end,strlen($in)-$end);
$in = $begin.$replace.$end;
}
/* Having this defined in just one spot could help when changes need
* to be made to the pattern
* Make sure that the expression is evaluated case insensitively
*
* Here's pretty sophisticated IP matching:
* $IPMatch = '(2[0-5][0-9]|1?[0-9]{1,2})';
* $IPMatch = '\[?' . $IPMatch . '(\.' . $IPMatch . '){3}\]?';
*/
/* Here's enough: */
global $IP_RegExp_Match, $Host_RegExp_Match, $Email_RegExp_Match;
$IP_RegExp_Match = '\\[?[0-9]{1,3}(\\.[0-9]{1,3}){3}\\]?';
$Host_RegExp_Match = '(' . $IP_RegExp_Match .
'|[0-9a-z]([-.]?[0-9a-z])*\\.[a-z][a-z]+)';
$Email_RegExp_Match = '[0-9a-z]([-_.+]?[0-9a-z])*(%' . $Host_RegExp_Match .
')?@' . $Host_RegExp_Match;
/**
* rfc 2368 (mailto URL) preg_match() regexp
* @link http://www.ietf.org/rfc/rfc2368.txt
* @global string MailTo_PReg_Match the encapsulated regexp for preg_match()
*/
global $MailTo_PReg_Match;
$Mailto_Email_RegExp = '[0-9a-z%]([-_.+%]?[0-9a-z])*(%' . $Host_RegExp_Match . ')?@' . $Host_RegExp_Match;
$MailTo_PReg_Match = '/((?:' . $Mailto_Email_RegExp . ')*)((?:\?(?:to|cc|bcc|subject|body)=[^\s\?&=,()]+)?(?:&(?:to|cc|bcc|subject|body)=[^\s\?&=,()]+)*)/i';
function parseEmail (&$body) {
global $color, $Email_RegExp_Match, $compose_new_win;
$sbody = $body;
$addresses = array();
/* Find all the email addresses in the body */
while(preg_match('/'.$Email_RegExp_Match.'/i', $sbody, $regs)) {
$addresses[$regs[0]] = $regs[0];
$start = strpos($sbody, $regs[0]) + strlen($regs[0]);
$sbody = substr($sbody, $start);
}
/* Replace each email address with a compose URL */
foreach ($addresses as $email) {
$comp_uri = makeComposeLink('src/compose.php?send_to='.urlencode($email), $email);
$body = str_replace($email, $comp_uri, $body);
}
/* Return number of unique addresses found */
return count($addresses);
}
/* We don't want to re-initialize this stuff for every line. Save work
* and just do it once here.
*/
global $url_parser_url_tokens;
$url_parser_url_tokens = array(
'http://',
'https://',
'ftp://',
'telnet:', // Special case -- doesn't need the slashes
'mailto:', // Special case -- doesn't use the slashes
'gopher://',
'news://');
global $url_parser_poss_ends;
$url_parser_poss_ends = array(' ', "\n", "\r", '<', '>', ".\r", ".\n",
'. ', ' ', ')', '(', '"', '<', '>', '.<',
']', '[', '{', '}', "\240", ', ', '. ', ",\n", ",\r");
/**
* Parses a body and converts all found URLs to clickable links.
*
* @param string body the body to process, by ref
* @return void
*/
function parseUrl (&$body) {
global $url_parser_poss_ends, $url_parser_url_tokens;
$start = 0;
$blength = strlen($body);
while ($start < $blength) {
$target_token = '';
$target_pos = $blength;
/* Find the first token to replace */
foreach ($url_parser_url_tokens as $the_token) {
$pos = strpos(strtolower($body), $the_token, $start);
if (is_int($pos) && $pos < $target_pos) {
$target_pos = $pos;
$target_token = $the_token;
}
}
/* Look for email addresses between $start and $target_pos */
$check_str = substr($body, $start, $target_pos-$start);
if (parseEmail($check_str)) {
replaceBlock($body, $check_str, $start, $target_pos);
$blength = strlen($body);
$target_pos = strlen($check_str) + $start;
}
// rfc 2368 (mailto URL)
if ($target_token == 'mailto:') {
$target_pos += 7; //skip mailto:
$end = $blength;
$mailto = substr($body, $target_pos, $end-$target_pos);
global $MailTo_PReg_Match;
if ((preg_match($MailTo_PReg_Match, $mailto, $regs)) && ($regs[0] != '')) {
$mailto_before = $target_token . $regs[0];
/**
* '+' characters in a mailto URI don't need to be percent-encoded.
* However, when mailto URI data is transported via HTTP, '+' must
* be percent-encoded as %2B so that when the HTTP data is
* percent-decoded, you get '+' back and not a space.
*/
$mailto_params = str_replace("+", "%2B", $regs[10]);
if ($regs[1]) { //if there is an email addr before '?', we need to merge it with the params
$to = 'to=' . str_replace("+", "%2B", $regs[1]);
if (strpos($mailto_params, 'to=') > -1) //already a 'to='
$mailto_params = str_replace('to=', $to . '%2C%20', $mailto_params);
else {
if ($mailto_params) //already some params, append to them
$mailto_params .= '&' . $to;
else
$mailto_params .= '?' . $to;
}
}
$url_str = preg_replace(array('/to=/i', '/(?<!b)cc=/i', '/bcc=/i'), array('send_to=', 'send_to_cc=', 'send_to_bcc='), $mailto_params);
$comp_uri = makeComposeLink('src/compose.php' . $url_str, $mailto_before);
replaceBlock($body, $comp_uri, $target_pos - 7, $target_pos + strlen($regs[0]));
$target_pos += strlen($comp_uri) - 7;
}
}
else
/* If there was a token to replace, replace it */
if ($target_token != '') {
/* Find the end of the URL */
$end = $blength;
foreach ($url_parser_poss_ends as $val) {
$enda = strpos($body, $val, $target_pos);
if (is_int($enda) && $enda < $end) {
$end = $enda;
}
}
/* make sure that there are no 8bit chars between $target_pos and suspected end of URL */
if (!is_bool($first8bit=sq_strpos_8bit($body,$target_pos,$end))) {
$end = $first8bit;
}
/* Extract URL */
$url = substr($body, $target_pos, $end-$target_pos);
/* Needed since lines are not passed with \n or \r */
while ( preg_match('/[,.]$/', $url) ) {
$url = substr( $url, 0, -1 );
$end--;
}
/* Replace URL with HyperLinked Url, requires 1 char in link */
if ($url != '' && $url != $target_token) {
$url_str = "<a href=\"$url\" target=\"_blank\">$url</a>";
replaceBlock($body,$url_str,$target_pos,$end);
$target_pos += strlen($url_str);
}
else {
// Not quite a valid link, skip ahead to next chance
$target_pos += strlen($target_token);
}
}
/* Move forward */
$start = $target_pos;
$blength = strlen($body);
}
}
/**
* Finds first occurrence of 8bit data in the string
*
* Function finds first 8bit symbol or html entity that represents 8bit character.
* Search start is defined by $offset argument. Search ends at $maxlength position.
* If $maxlength is not defined or bigger than provided string, search ends when
* string ends.
*
* Check returned data type in order to avoid confusion between bool(false)
* (not found) and int(0) (first char in the string).
* @param string $haystack
* @param integer $offset
* @param integer $maxlength
* @return mixed integer with first 8bit character position or boolean false
* @since 1.5.2 and 1.4.7
*/
function sq_strpos_8bit($haystack,$offset=0,$maxlength=false) {
$ret = false;
if ($maxlength===false || strlen($haystack) < $maxlength) {
$maxlength=strlen($haystack);
}
for($i=$offset;$i<$maxlength;$i++) {
/* rh7-8 compatibility. don't use full 8bit range in regexp */
if (preg_match('/[\200-\237]|\240|[\241-\377]/',$haystack[$i])) {
/* we have 8bit char. stop here and return position */
$ret = $i;
break;
} elseif ($haystack[$i]=='&') {
$substring = substr($haystack,$i);
/**
* 1. look for "&#(decimal number);" where decimal_number is bigger than 127
* 2. look for "&x(hexadecimal number);", where hex number is bigger than x7f
* 3. look for any html character entity that is not 7bit html special char. Use
* own sq_get_html_translation_table() function with 'utf-8' character set in
* order to get all html entities.
*/
if ((preg_match('/^&#(\d+);/',$substring,$match) && $match[1]>127) ||
(preg_match('/^&x([0-9a-f]+);/i',$substring,$match) && $match[1]>"\x7f") ||
(preg_match('/^&([a-z]+);/i',$substring,$match) &&
!in_array($match[0],get_html_translation_table(HTML_SPECIALCHARS)) &&
in_array($match[0],sq_get_html_translation_table(HTML_ENTITIES,ENT_COMPAT,'utf-8')))) {
$ret = $i;
break;
}
}
}
return $ret;
}
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