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<?php

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/**

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* Google Analytics helpers

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* @package PUM

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if ( ! defined( 'ABSPATH' ) ) {

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exit;

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}

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/**

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* Class PUM_GA

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* @package Ahoy

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class PUM_GA {

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/**

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* Get PUM_GA uuid.

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* @return mixed|string

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public static function get_uuid() {

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static $uuid;

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if ( ! isset( $uuid ) ) {

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$cookie = self::parse_cookie();

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if ( is_array( $cookie ) && ! empty( $cookie['cid'] ) ) {

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$uuid = $cookie['cid'];

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} else {

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$uuid = self::generate_uuid();

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}

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}

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return $uuid;

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}

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/**

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* Handle the parsing of the _ga cookie or setting it to a unique identifier

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public static function parse_cookie() {

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static $cookie = false;

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if ( ! $cookie && isset( $_COOKIE['_ga'] ) ) {

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list( $version, $domainDepth, $cid1, $cid2 ) = preg_split( '[\.]', $_COOKIE['_ga'], 4 );

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$cookie = [

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'version' => $version,

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'domainDepth' => $domainDepth,

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'cid' => $cid1 . '.' . $cid2,

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];

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}

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return $cookie;

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}

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/**

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* Generate UUID v4 function - needed to generate a CID when one isn't available

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public static function generate_uuid() {

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return sprintf(

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'%04x%04x-%04x-%04x-%04x-%04x%04x%04x', // 32 bits for "time_low"

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mt_rand( 0, 0xffff ),

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mt_rand( 0, 0xffff ),

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// 16 bits for "time_mid"

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mt_rand( 0, 0xffff ),

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// 16 bits for "time_hi_and_version",

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// four most significant bits holds version number 4

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mt_rand( 0, 0x0fff ) | 0x4000,

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// 16 bits, 8 bits for "clk_seq_hi_res",

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// 8 bits for "clk_seq_low",

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// two most significant bits holds zero and one for variant DCE1.1

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mt_rand( 0, 0x3fff ) | 0x8000,

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// 48 bits for "node"

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mt_rand( 0, 0xffff ),

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mt_rand( 0, 0xffff ),

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mt_rand( 0, 0xffff )

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);

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}

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/**

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* Fire a hit to the google analytis collection api.

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* See https://developers.google.com/analytics/devguides/collection/protocol/v1/devguide

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* @param null $data

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* @return array|bool|WP_Error

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public static function fire_hit( $data = null ) {

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if ( $data ) {

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$getString = 'https://ssl.google-analytics.com/collect';

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$getString .= '?payload_data&';

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$getString .= http_build_query( $data );

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$result = wp_remote_get( $getString );

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return $result;

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}

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return false;

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}

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}

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