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<?php
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/**
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* protect email addresses (replace '@' and '.' and obfuscate address
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* @param string $content
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* @return string
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*/
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function doFilterEmail($content, $output_filter_mode) {
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// test if js-decryption is installed
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if( preg_match('/<head.*<.*src=\".*\/mdcr.js.*>.*<\/head/siU', $content) ) {
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$output_filter_mode |= pow(2, 2); // n | 2^2
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}else {
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// try to insert js-decrypt into <head> if available
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$script = str_replace('\\', '/',str_replace(WB_PATH,'', dirname(__FILE__)).'/js/mdcr.js');
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if(is_readable(WB_PATH.$script)) {
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$scriptLink = '<script src="'.WB_URL.$script.'" type="text/javascript"></script>';
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$regex = '/(.*)(<\s*?\/\s*?head\s*>.*)/isU';
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$replace = '$1'.$scriptLink.'$2';
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$content = preg_replace ($regex, $replace, $content);
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$output_filter_mode |= pow(2, 2); // n | 2^2
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}
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}
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// define some constants so we do not call the database in the callback functions again
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define('OUTPUT_FILTER_MODE', (int)$output_filter_mode);
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/* *** obfuscate mailto addresses by js:mdcr *** */
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// work out the defined output filter mode: possible output filter modes: [0], 1, 2, 3, 6, 7
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// 2^0 * (0.. disable, 1.. enable) filtering of mail addresses in text
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// 2^1 * (0.. disable, 1.. enable) filtering of mail addresses in mailto links
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// 2^2 * (0.. disable, 1.. enable) Javascript mailto encryption (only if mailto filtering enabled)
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// first search part to find all mailto email addresses
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$pattern = '#(<a[^<]*href\s*?=\s*?"\s*?mailto\s*?:\s*?)([A-Z0-9._%+-]+@(?:[A-Z0-9-]+\.)+[A-Z]{2,4})([^"]*?)"([^>]*>)(.*?)</a>';
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// second part to find all non mailto email addresses
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$pattern .= '|(value\s*=\s*"|\')??\b([A-Z0-9._%+-]+@(?:[A-Z0-9-]+\.)+[A-Z]{2,4})\b#i';
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/*
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Sub 1:\b(<a.[^<]*href\s*?=\s*?"\s*?mailto\s*?:\s*?) --> "<a id="yyy" class="xxx" href = " mailto :" ignoring white spaces
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Sub 2:([A-Z0-9._%+-]+@(?:[A-Z0-9-]+\.)+[A-Z]{2,4}) --> the email address in the mailto: part of the mail link
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Sub 3:([^"]*?)" --> possible ?Subject&cc... stuff attached to the mail address
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Sub 4:([^>]*>) --> all class or id statements after the mailto but before closing ..>
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Sub 5:(.*?)</a>\b --> the mailto text; all characters between >xxxxx</a>
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Sub 6:|\b([A-Z0-9._%+-]+@(?:[A-Z0-9-]+\.)+[A-Z]{2,4})\b --> email addresses which may appear in the text (require word boundaries)
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*/
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// find all email addresses embedded in the content and filter them using a callback function
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$content = preg_replace_callback($pattern, '_cbDoExecuteFilter', $content);
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return $content;
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}
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/* ************************************************************************** */
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/**
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* callback-function for function _doFilterEmail() to proceed search results
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* @param array results from preg_replace
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* @return string proceeded replacement string
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*/
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function _cbDoExecuteFilter($match) {
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// check if required arguments are defined
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if(!( defined('OUTPUT_FILTER_MODE')
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&& defined('OUTPUT_FILTER_AT_REPLACEMENT')
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&& defined('OUTPUT_FILTER_MODE')
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) ) {
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return $match[0];
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}
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$search = array('@', '.');
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$replace = array(OUTPUT_FILTER_AT_REPLACEMENT ,OUTPUT_FILTER_DOT_REPLACEMENT);
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// check if the match contains the expected number of subpatterns (6|8)
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switch (count($match)) {
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case 8:
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/** OUTPUT FILTER FOR EMAIL ADDRESSES EMBEDDED IN TEXT **/
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// 1.. text mails only, 3.. text mails + mailto (no JS), 7 text mails + mailto (JS)
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if(!in_array(OUTPUT_FILTER_MODE, array(1,3,7))) return $match[0];
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// do not filter mail addresses included in input tags (<input ... value = "test@mail)
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if (strpos($match[6], 'value') !== false) return $match[0];
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// filtering of non mailto email addresses enabled
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return str_replace($search, $replace, $match[0]);
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break;
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case 6:
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/** OUTPUT FILTER FOR EMAIL ADDRESSES EMBEDDED IN MAILTO LINKS **/
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// 2.. mailto only (no JS), 3.. text mails + mailto (no JS), 6.. mailto only (JS), 7.. all filters active
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if(!in_array(OUTPUT_FILTER_MODE, array(2,3,6,7))) return $match[0];
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// check if last part of the a href link: >xxxx</a> contains a email address we need to filter
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$pattern = '#[A-Z0-9._%+-]+@(?:[A-Z0-9-]+\.)+[A-Z]{2,4}#i';
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if(preg_match_all($pattern, $match[5], $matches)) {
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foreach($matches as $submatch) {
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foreach($submatch as $value) {
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// replace all . and all @ in email address parts by (dot) and (at) strings
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$match[5] = str_replace($value, str_replace($search, $replace, $value), $match[5]);
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}
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}
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}
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// check if Javascript encryption routine is enabled
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if(in_array(OUTPUT_FILTER_MODE, array(6,7))) {
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/** USE JAVASCRIPT ENCRYPTION FOR MAILTO LINKS **/
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// extract possible class and id attribute from ahref link
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preg_match('/class\s*?=\s*?("|\')(.*?)\1/ix', $match[0], $class_attr);
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$class_attr = empty($class_attr) ? '' : 'class="' . $class_attr[2] . '" ';
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preg_match('/id\s*?=\s*?("|\')(.*?)\1/ix', $match[0], $id_attr);
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$id_attr = empty($id_attr) ? '' : 'id="' . $id_attr[2] . '" ';
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// preprocess mailto link parts for further usage
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$search = array('@', '.', '_', '-'); $replace = array('F', 'Z', 'X', 'K');
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$email_address = str_replace($search, $replace, strtolower($match[2]));
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$email_subject = rawurlencode(html_entity_decode($match[3]));
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// create a random encryption key for the Caesar cipher
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mt_srand((double)microtime()*1000000); // (PHP < 4.2.0)
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$shift = mt_rand(1, 25);
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// encrypt the email using an adapted Caesar cipher
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$encrypted_email = "";
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for($i = strlen($email_address) -1; $i > -1; $i--) {
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if(preg_match('#[FZXK0-9]#', $email_address[$i], $characters)) {
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$encrypted_email .= $email_address[$i];
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} else {
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$encrypted_email .= chr((ord($email_address[$i]) -97 + $shift) % 26 + 97);
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}
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}
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$encrypted_email .= chr($shift + 97);
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// build the encrypted Javascript mailto link
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$mailto_link = "<a {$class_attr}{$id_attr}href=\"javascript:mdcr('$encrypted_email','$email_subject')\">" .$match[5] ."</a>";
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return $mailto_link;
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} else {
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/** DO NOT USE JAVASCRIPT ENCRYPTION FOR MAILTO LINKS **/
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// as minimum protection, replace @ in the mailto part by (at)
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// dots are not transformed as this would transform my.name@domain.com into: my(dot)name(at)domain(dot)com
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// rebuild the mailto link from the subpatterns (at the missing characters " and </a>")
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return $match[1] .str_replace('@', OUTPUT_FILTER_AT_REPLACEMENT, $match[2]) .$match[3] .'"' .$match[4] .$match[5] .'</a>';
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// if you want to protect both, @ and dots, comment out the line above and remove the comment from the line below
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// return $match[1] .str_replace($search, $replace, $match[2]) .$match[3] .'"' .$match[4] .$match[5] .'</a>';
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}
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break;
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default:
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// number of subpatterns do not match the requirements ... do nothing
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return $match[0];
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break;
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}
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}
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