installed plugin Jetpack Protect version 1.0.2

wp-content/plugins/jetpack-protect/jetpack_vendor/automattic/jetpack-a8c-mc-stats/src/class-a8c-mc-stats.php

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+<?php
+/**
+ * Jetpack MC Stats package.
+ *
+ * @package  automattic/jetpack-mc-stats
+ */
+
+namespace Automattic\Jetpack;
+
+/**
+ * Class MC Stats, used to record stats using https://pixel.wp.com/g.gif
+ */
+class A8c_Mc_Stats {
+
+	/**
+	 * Holds the stats to be processed
+	 *
+	 * @var array
+	 */
+	private $stats = array();
+
+	/**
+	 * Indicates whether to use the transparent pixel (b.gif) instead of the regular smiley (g.gif)
+	 *
+	 * @var boolean
+	 */
+	public $use_transparent_pixel = true;
+
+	/**
+	 * Class Constructor
+	 *
+	 * @param boolean $use_transparent_pixel Use the transparent pixel instead of the smiley.
+	 */
+	public function __construct( $use_transparent_pixel = true ) {
+		$this->use_transparent_pixel = $use_transparent_pixel;
+	}
+
+	/**
+	 * Store a stat for later output.
+	 *
+	 * @param string $group The stat group.
+	 * @param string $name The stat name to bump.
+	 *
+	 * @return boolean true if stat successfully added
+	 */
+	public function add( $group, $name ) {
+
+		if ( ! \is_string( $group ) || ! \is_string( $name ) ) {
+			return false;
+		}
+
+		if ( ! isset( $this->stats[ $group ] ) ) {
+			$this->stats[ $group ] = array();
+		}
+
+		if ( \in_array( $name, $this->stats[ $group ], true ) ) {
+			return false;
+		}
+
+		$this->stats[ $group ][] = $name;
+
+		return true;
+	}
+
+	/**
+	 * Gets current stats stored to be processed
+	 *
+	 * @return array $stats
+	 */
+	public function get_current_stats() {
+		return $this->stats;
+	}
+
+	/**
+	 * Return the stats from a group in an array ready to be added as parameters in a query string
+	 *
+	 * @param string $group_name The name of the group to retrieve.
+	 * @return array Array with one item, where the key is the prefixed group and the value are all stats concatenated with a comma. If group not found, an empty array will be returned
+	 */
+	public function get_group_query_args( $group_name ) {
+		$stats = $this->get_current_stats();
+		if ( isset( $stats[ $group_name ] ) && ! empty( $stats[ $group_name ] ) ) {
+			return array( "x_jetpack-{$group_name}" => implode( ',', $stats[ $group_name ] ) );
+		}
+		return array();
+	}
+
+	/**
+	 * Gets a list of trac URLs for every stored URL
+	 *
+	 * @return array An array of URLs
+	 */
+	public function get_stats_urls() {
+
+		$urls = array();
+
+		foreach ( $this->get_current_stats() as $group => $stat ) {
+			$group_query_string = $this->get_group_query_args( $group );
+			$urls[]             = $this->build_stats_url( $group_query_string );
+		}
+
+		return $urls;
+
+	}
+
+	/**
+	 * Outputs the tracking pixels for the current stats and empty the stored stats from the object
+	 *
+	 * @return void
+	 */
+	public function do_stats() {
+		$urls = $this->get_stats_urls();
+		foreach ( $urls as $url ) {
+			echo '<img src="' . esc_url( $url ) . '" width="1" height="1" style="display:none;" />';
+		}
+		$this->stats = array();
+	}
+
+	/**
+	 * Pings the stats server for the current stats and empty the stored stats from the object
+	 *
+	 * @return void
+	 */
+	public function do_server_side_stats() {
+		$urls = $this->get_stats_urls();
+		foreach ( $urls as $url ) {
+			$this->do_server_side_stat( $url );
+		}
+		$this->stats = array();
+	}
+
+	/**
+	 * Runs stats code for a one-off, server-side.
+	 *
+	 * @param string $url string The URL to be pinged. Should include `x_jetpack-{$group}={$stats}` or whatever we want to store.
+	 *
+	 * @return bool If it worked.
+	 */
+	public function do_server_side_stat( $url ) {
+		$response = wp_remote_get( esc_url_raw( $url ) );
+		if ( is_wp_error( $response ) ) {
+			return false;
+		}
+
+		if ( 200 !== wp_remote_retrieve_response_code( $response ) ) {
+			return false;
+		}
+
+		return true;
+	}
+
+	/**
+	 * Builds the stats url.
+	 *
+	 * @param array $args array|string The arguments to append to the URL.
+	 *
+	 * @return string The URL to be pinged.
+	 */
+	public function build_stats_url( $args ) {
+		$defaults = array(
+			'v'    => 'wpcom2',
+			'rand' => md5( wp_rand( 0, 999 ) . time() ),
+		);
+		$args     = wp_parse_args( $args, $defaults );
+		$gifname  = true === $this->use_transparent_pixel ? 'b.gif' : 'g.gif';
+
+		/**
+		 * Filter the URL used as the Stats tracking pixel.
+		 *
+		 * @since-jetpack 2.3.2
+		 * @since 1.0.0
+		 *
+		 * @param string $url Base URL used as the Stats tracking pixel.
+		 */
+		$base_url = apply_filters(
+			'jetpack_stats_base_url',
+			'https://pixel.wp.com/' . $gifname
+		);
+		$url      = add_query_arg( $args, $base_url );
+		return $url;
+	}
+
+}