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<?php
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define(REFERER_THEME, 'referer_theme');
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define(REFERER_THEME_TIMESTAMP, 'referer_theme_timestamp');
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define(REFERER_THEME_THEME, 'referer_theme_theme');
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define(REFERER_THEME_INTERVAL, 'referer_theme_interval');
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define(REFERER_THEME_MAX_SITES, 3);
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// Number of seconds to keep the site in the assigned theme
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// for the current visitor. Default is 3 hours
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define(REFERER_THEME_PERIOD, 60*60*3);
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function referer_theme_help($section) {
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switch ($section) {
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case 'admin/modules#description':
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case 'admin/settings/referer_theme':
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case 'admin/help#referer_theme':
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return t('This module changes the site to a different theme for each visitor based on referer.');
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}
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}
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function referer_theme_admin_settings() {
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$theme_list = array();
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foreach(list_themes() as $key => $theme) {
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if ($theme->status == 1) {
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$theme_list[$key] = $theme->name;
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}
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}
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for($i=1; $i<REFERER_THEME_MAX_SITES+1; $i++) {
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$set = 'host' . $i;
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$form[$set] = array(
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'#type' => 'fieldset',
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'#title' => t('Host ' . $i),
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'#description' => t(''),
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);
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$param = REFERER_THEME . '_site_' . $i;
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$form[$set][$param] = array(
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'#type' => 'textfield',
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'#title' => t('Site host name'),
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'#default_value' => variable_get($param, ''),
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'#size' => 25,
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'#maxlength' => 25,
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'#description' => t('The host name of the site that is allowed to referer_theme. This is the part after http:// and before the first /.'),
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);
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$param = REFERER_THEME . '_theme_' . $i;
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$form[$set][$param] = array(
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'#type' => 'select',
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'#title' => t('Site theme'),
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'#default_value' => variable_get($param, ''),
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'#options' => $theme_list,
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);
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}
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return system_settings_form($form);
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}
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function referer_theme_menu($may_cache) {
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$items = array();
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if ($may_cache) {
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$items[] = array(
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'path' => 'admin/settings/referer_theme',
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'title' => t('Referer theme'),
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'description' => t('Referer theme settings'),
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'callback' => 'drupal_get_form',
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'callback arguments' => array('referer_theme_admin_settings'),
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'access' => user_access('administer site configuration'),
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'type' => MENU_NORMAL_ITEM, // optional
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);
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// Check if we should force a reset
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if ($_GET[REFERER_THEME] == 'false') {
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_referer_theme_session_reset();
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return $items;
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}
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// Check if the time interval expired
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_referer_theme_session_check_reset();
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// Check if we already have an referer_theme theme
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if (_referer_theme_session_get()) {
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return $items;
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}
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// Check the referer and set the referer_theme if applicable
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_referer_theme_site_match();
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return $items;
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}
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return $items;
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}
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function _referer_theme_site_match() {
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$page_match = false;
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for($i=1; $i<REFERER_THEME_MAX_SITES+1; $i++) {
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$site = variable_get(REFERER_THEME . '_site_' . $i, '');
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if ($site) {
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if (_referer_theme_check_referer($site, $i)) {
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$page_match = true;
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break;
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}
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}
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}
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return $page_match;
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}
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function _referer_theme_check_referer($site, $index) {
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$rc = false;
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$protocol = ($_SERVER['HTTPS'] == 'on') ? 'https' : 'http';
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$pattern = preg_quote("$protocol://$site", '/');
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$pattern = '/^' . $pattern . '/';
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$referer = $_SERVER['HTTP_REFERER'];
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if (preg_match($pattern, $referer)) {
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_referer_theme_session_set($index);
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$rc = true;
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}
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return $rc;
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}
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function _referer_theme_session_get() {
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global $custom_theme;
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if ($_SESSION[REFERER_THEME_TIMESTAMP]) {
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$custom_theme = $_SESSION[REFERER_THEME_THEME];
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return true;
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}
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return false;
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}
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function _referer_theme_session_set($site_index) {
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global $custom_theme;
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$theme = variable_get(REFERER_THEME . '_theme_' . $site_index, '');
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$_SESSION[REFERER_THEME_TIMESTAMP] = time();
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$_SESSION[REFERER_THEME_THEME] = $theme;
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$custom_theme = $theme;
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}
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function _referer_theme_session_reset() {
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unset($_SESSION[REFERER_THEME_TIMESTAMP]);
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unset($_SESSION[REFERER_THEME_THEME]);
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}
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function _referer_theme_session_check_reset() {
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$timestamp = $_SESSION[REFERER_THEME_TIMESTAMP] + variable_get(REFERER_THEME_INTERVAL, REFERER_THEME_PERIOD);
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$now = time();
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if ($timestamp > 0 && $timestamp <= $now) {
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_referer_theme_session_reset();
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return true;
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}
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return false;
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}
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