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<?php
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// $Id: filter-routines.php 519 2007-12-23 14:37:02Z Doc $
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/*
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Website Baker Project <http://www.websitebaker.org/>
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Copyright (C) 2004-2008, Ryan Djurovich
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Website Baker is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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Website Baker is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Website Baker; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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// direct access prevention
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defined('WB_PATH') OR die(header('Location: ../index.php'));
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// function to read the current filter settings
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if (!function_exists('get_mail_filter_settings')) {
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function get_mail_filter_settings() {
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global $database, $admin;
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// connect to database and read out filter settings
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$result = $database->query("SELECT * FROM " .TABLE_PREFIX ."mod_mail_filter");
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if($result->numRows() > 0) {
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// get all data
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$data = $result->fetchRow();
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$filter_settings['email_filter'] = $admin->strip_slashes($data['email_filter']);
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$filter_settings['mailto_filter'] = $admin->strip_slashes($data['mailto_filter']);
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$filter_settings['at_replacement'] = $admin->strip_slashes($data['at_replacement']);
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$filter_settings['dot_replacement'] = $admin->strip_slashes($data['dot_replacement']);
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} else {
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// something went wrong, use dummy value
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$filter_settings['email_filter'] = '0';
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$filter_settings['mailto_filter'] = '0';
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$filter_settings['at_replacement'] = '(at)';
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$filter_settings['dot_replacement'] = '(dot)';
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}
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// return array with filter settings
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return $filter_settings;
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}
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}
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// function to rewrite email before beeing displayed the frontend
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if (!function_exists('filter_email_links')) {
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function filter_email_links($content) {
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// get the mailer settings from the global variable defined in /wb/index.php
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global $mail_filter_settings;
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// check if there is anything to do
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global $mail_filter_settings;
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if(!isset($mail_filter_settings['email_filter']) || $mail_filter_settings['email_filter'] !=='1' ||
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!isset($mail_filter_settings['mailto_filter']) || !isset($mail_filter_settings['at_replacement']) ||
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!isset($mail_filter_settings['dot_replacement'])) {
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return $content;
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}
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// search pattern to find all mail addresses embedded in the frontend content (both text and mailto emails)
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$pattern = '#(<a href="mailto:)?(\w[\w|\.|\-]+@\w[\w|\.|\-]+\.[a-zA-Z]{2,})([^">]*">)?([^<]*</a>)?#i';
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/*
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exp 1: (<a href=mailto:)? -> Optional: search for <a href=mailto:
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exp 2a: (\w[\w|\.|\-]+@ -> 1st char word element, one ore more (+) word elements, or (|) . or (|) - followed by @
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exp 2b: \w[\w|\.|\-]+ -> see exp 2 for explanation
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exp 2c: \.[a-zA-Z]{2,}) -> dot followed by at least 2 characters (TLD filter: .de, .com, .info)
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exp 3: ([^">]*">)? -> Optional: all characters except > followed by ">; could contain ?subject=...&body=...
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exp 4: ([^<]*</a>)? -> Optional: all characters except <; email link message
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? 1 or 0 matches, # encapsulate regex, () subpattern as additional array element, i.. inherent (not case sensitive)
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*/
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// find all email addresses embedded in the content and encrypt them via callback function encrypt_emails
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$content = preg_replace_callback($pattern, 'encrypt_emails', $content);
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return $content;
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}
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}
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// function to encrypt mailto links before beeing displayed at the frontend
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if (!function_exists('encrypt_emails')) {
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function encrypt_emails($match) {
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// get the mailer settings from the global variable defined in /wb/index.php
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global $mail_filter_settings;
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// check if there is anything to do
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if(!isset($mail_filter_settings['email_filter']) || $mail_filter_settings['email_filter'] !=='1' ||
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!isset($mail_filter_settings['mailto_filter']) || !isset($mail_filter_settings['at_replacement']) ||
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!isset($mail_filter_settings['dot_replacement'])) {
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return $match[0];
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}
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// work out replacements
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$at_replace = strip_tags($mail_filter_settings['at_replacement']);
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$dot_replace = strip_tags($mail_filter_settings['dot_replacement']);
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// check if extracted email address is mailto or text ($match[0] contains entire regexp pattern)
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if (strpos($match[0], "mailto:") > 0) {
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// mailto email
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// do we need to consider mailto links
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if($mail_filter_settings['mailto_filter'] !='1') {
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// do not touch mailto links
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return $match[0];
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}
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// email sub parts: [<a href="mailto:] [name@domain.com] [?subject=blubb&Body=text">] [Mail description</a>]
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$email_href = $match[1]; // a href part
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$email_address = $match[2]; // email address
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$email_options = $match[3]; // optional: subject or body text for mail clients
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$email_link_text = $match[4]; // optional: mail description
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// do some cleaning
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$email_options = str_replace("\">", "", $email_options); // strip off '">'
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$email_link_text = str_replace("</a>", "", trim($email_link_text)); // strip off closing </a>
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// make sure that all emails have a description
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if(strlen($email_link_text) == 0 ) {
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$email_link_text = $email_address;
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}
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// replace "@" and "." within top level domain (TLD) if link text is a valid email address
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if(preg_match('#\w[\w|\.|\-]+@\w[\w|\.|\-]+\.[a-zA-Z]{2,}#i', $email_link_text, $email)) {
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$email_link_text = str_replace("@", $at_replace, $email_address); // replace @
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// remove "." from top level domain (TLD) part
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if (preg_match('#\.[a-zA-Z]{2,}$#im', $email_link_text, $tld) !==0) {
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$tld_replace = str_replace(".", $dot_replace, $tld[0]);
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$email_link_text = str_replace($tld[0], $tld_replace, $email_link_text); // replace . in email TLD part
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}
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}
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//////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// encrypt the email address
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//////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// create random encryption key
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mt_srand((double)microtime()*1000000); // initialize the randomizer (PHP < 4.2.0)
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$char_shift = mt_rand(1, 5); // shift:=1; a->b, shift:=5; a-->f
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$decryption_key = chr($char_shift+97); // ASCII a:=97
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// prepare mailto string for encryption (mail protocol, decryption key, mail address)
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$email_address = "mailto:" .$decryption_key .$email_address;
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// encrypt email address by shifting characters
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$encrypted_email = "";
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for($i=0; $i<strlen($email_address); $i++) {
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$encrypted_email .= chr(ord($email_address[$i]) + $char_shift);
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}
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$encrypted_email[7] = $decryption_key; // replace first character after mailto: with decryption key
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$encrypted_email = rawurlencode($encrypted_email);
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// return encrypted javascript mailto link
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$mailto_link = "<a href=\"javascript:mdcr('"; // a href part with javascript function to decrypt the email address
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$mailto_link .= "$encrypted_email')\">"; // add encrypted email address as paramter to JS function mdcr
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$mailto_link .= $email_link_text ."</a>"; // add email link text and closing </a> tag
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return $mailto_link;
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} else {
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// text email (e.g. name@domain.com)
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$match[0] = str_replace("@", $at_replace, $match[0]); // replace @
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// remove "." from top level domain (TLD) part
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if (preg_match('#\.[a-zA-Z]{2,}$#im', $match[0], $tld) !==0) {
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$tld_replace = str_replace(".", $dot_replace, $tld[0]);
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return str_replace($tld[0], $tld_replace, $match[0]); // replace . in email TLD part
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}
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}
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}
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}
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?>
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