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<?php
/*
Copyright 2006 Aaron D. Campbell (email : wp_plugins@xavisys.com)
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/**
* Jetpack_Google_Analytics is the class that handles ALL of the plugin functionality.
* It helps us avoid name collisions
* http://codex.wordpress.org/Writing_a_Plugin#Avoiding_Function_Name_Collisions
*/
class Jetpack_Google_Analytics {
/**
* @var Jetpack_Google_Analytics - Static property to hold our singleton instance
*/
static $instance = false;
/**
* This is our constructor, which is private to force the use of get_instance()
*
* @return void
*/
private function __construct() {
add_action( 'wp_footer', array( $this, 'insert_code' ) );
}
/**
* Function to instantiate our class and make it a singleton
*/
public static function get_instance() {
if ( ! self::$instance ) {
self::$instance = new self;
}
return self::$instance;
}
/**
* Used to generate a tracking URL
*
* @param array $track - Must have ['data'] and ['code'].
* @return string - Tracking URL
*/
private function _get_url( $track ) {
$site_url = ( is_ssl() ? 'https://':'http://' ) . sanitize_text_field( wp_unslash( $_SERVER['HTTP_HOST'] ) ); // Input var okay.
foreach ( $track as $k => $value ) {
if ( strpos( strtolower( $value ), strtolower( $site_url ) ) === 0 ) {
$track[ $k ] = substr( $track[ $k ], strlen( $site_url ) );
}
if ( 'data' === $k ) {
$track[ $k ] = preg_replace( '/^https?:\/\/|^\/+/i', '', $track[ $k ] );
}
// This way we don't lose search data.
if ( 'data' === $k && 'search' === $track['code'] ) {
$track[ $k ] = rawurlencode( $track[ $k ] );
} else {
$track[ $k ] = preg_replace( '/[^a-z0-9\.\/\+\?=-]+/i', '_', $track[ $k ] );
}
$track[ $k ] = trim( $track[ $k ], '_' );
}
$char = ( strpos( $track['data'], '?' ) === false ) ? '?' : '&';
return str_replace( "'", "\'", "/{$track['code']}/{$track['data']}{$char}referer=" . rawurlencode( isset( $_SERVER['HTTP_REFERER'] ) ? $_SERVER['HTTP_REFERER'] : '' ) ); // Input var okay.
}
/**
* Maybe output or return, depending on the context
*/
private function _output_or_return( $val, $maybe ) {
if ( $maybe ) {
echo $val . "\r\n";
} else {
return $val;
}
}
/**
* This injects the Google Analytics code into the footer of the page.
*
* @param bool[optional] $output - defaults to true, false returns but does NOT echo the code.
*/
public function insert_code( $output = true ) {
// If $output is not a boolean false, set it to true (default).
$output = ( false !== $output);
$tracking_id = $this->_get_tracking_code();
if ( empty( $tracking_id ) ) {
return $this->_output_or_return( '<!-- Your Google Analytics Plugin is missing the tracking ID -->', $output );
}
// If we're in the admin_area, return without inserting code.
if ( is_admin() ) {
return $this->_output_or_return( '<!-- Your Google Analytics Plugin is set to ignore Admin area -->', $output );
}
$custom_vars = array(
"_gaq.push(['_setAccount', '{$tracking_id}']);",
);
$track = array();
if ( is_404() ) {
// This is a 404 and we are supposed to track them.
$custom_vars[] = "_gaq.push( [ '_trackEvent', '404', document.location.href, document.referrer ] );";
} elseif ( is_search() ) {
// Set track for searches, if it's a search, and we are supposed to.
$track['data'] = sanitize_text_field( wp_unslash( $_REQUEST['s'] ) ); // Input var okay.
$track['code'] = 'search';
}
if ( ! empty( $track ) ) {
$track['url'] = $this->_get_url( $track );
// adjust the code that we output, account for both types of tracking.
$track['url'] = esc_js( str_replace( '&', '&', $track['url'] ) );
$custom_vars[] = "_gaq.push(['_trackPageview','{$track['url']}']);";
} else {
$custom_vars[] = "_gaq.push(['_trackPageview']);";
}
$async_code = "<!-- Jetpack Google Analytics -->
<script type='text/javascript'>
var _gaq = _gaq || [];
%custom_vars%
(function() {
var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();
</script>";
$custom_vars_string = implode( "\r\n", $custom_vars );
$async_code = str_replace( '%custom_vars%', $custom_vars_string, $async_code );
return $this->_output_or_return( $async_code, $output );
}
/**
* Used to get the tracking code option
*
* @return tracking code option value.
*/
private function _get_tracking_code() {
$o = get_option( 'jetpack_wga' );
if ( isset( $o['code'] ) && preg_match( '#UA-[\d-]+#', $o['code'], $matches ) ) {
return $o['code'];
}
return '';
}
}
global $jetpack_google_analytics;
$jetpack_google_analytics = Jetpack_Google_Analytics::get_instance();
|
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