/**

const PROXY_IP_HEADERS = [

'HTTP_CF_CONNECTING_IP',

'HTTP_X_FORWARDED_FOR',

'REMOTE_ADDR',

'HTTP_CLIENT_IP',

];

/**

private $namespace = '';

/**

private $base = '';

/**

private $endpoint = '';

/**

public function __construct( $init = true ) {

$this->namespace = Helpers::get_proxy_resource( 'namespace' ) . '/v1';

$this->base = Helpers::get_proxy_resource( 'base' );

$this->endpoint = Helpers::get_proxy_resource( 'endpoint' );

$this->init( $init );

}

/**

private function init( $init ) {

if ( ! $init ) {

return;

}

$settings = [];

if ( array_key_exists( 'option_name', $_POST ) && $_POST[ 'option_name' ] == 'proxy_enabled' && array_key_exists( 'option_value', $_POST ) && $_POST[ 'option_value' ] == 'on' ) {

$settings[ 'proxy_enabled' ] = 'on'; // @codeCoverageIgnore

}

// No need to continue if Proxy isn't enabled .

if ( Helpers::proxy_enabled( $settings ) ) {

add_action( 'rest_api_init', [ $this, 'register_route' ] );

}

add_filter( 'rest_post_dispatch', [ $this, 'force_http_response_code' ], null, 3 );

}

/**

public function do_request( $name = 'pageview', $domain = '', $url = '', $props = [] ) {

$request = new \WP_REST_Request( 'POST', "/$this->namespace/v1/$this->base/$this->endpoint" );

$body = [

'n' => $name,

'd' => $domain ?: Helpers::get_domain(),

'u' => $url ?: wp_get_referer(),

];

// URL is required, so if no $url was set and no referer was found, attempt to create it from the REQUEST_URI server variable.

if ( empty( $body[ 'u' ] ) ) {

$body[ 'u' ] = $this->generate_event_url(); // @codeCoverageIgnore

}

// Revenue events use a different approach.

if ( isset( $props[ 'revenue' ] ) ) {

$body[ 'revenue' ] = reset( $props ); // @codeCoverageIgnore

} elseif ( ! empty( $props ) ) {

$body[ 'p' ] = $props; // @codeCoverageIgnore

}

$request->set_body( wp_json_encode( $body ) );

return $this->send_event( $request );

}

/**

public function generate_event_url() {

$url = '';

$parts = wp_parse_url( $_SERVER[ 'REQUEST_URI' ] );

$home_url_parts = wp_parse_url( get_home_url() );

if ( isset( $home_url_parts[ 'scheme' ] ) && isset( $home_url_parts[ 'host' ] ) && isset( $parts[ 'path' ] ) ) {

$url = $home_url_parts[ 'scheme' ] . '://' . $home_url_parts [ 'host' ] . $parts[ 'path' ];

}

return $url;

}

/**

public function send_event( $request ) {

$params = $request->get_body();

$ip = $this->get_user_ip_address();

$url = 'https://plausible.io/api/event';

$ua = ! empty ( $_SERVER[ 'HTTP_USER_AGENT' ] ) ? wp_kses( $_SERVER[ 'HTTP_USER_AGENT' ], 'strip' ) : '';

return wp_remote_post(

$url,

[

'user-agent' => $ua,

'headers' => array_merge(

$this->get_forwarded_headers(),

[

'X-Forwarded-For' => $ip,

'Content-Type' => 'application/json',

]

),

'body' => wp_kses_no_null( $params ),

]

);

}

/**

public function get_forwarded_headers() {

$headers = [];

foreach ( $_SERVER as $key => $value ) {

if ( $key !== 'HTTP_ACCEPT_LANGUAGE' && strpos( $key, 'HTTP_SEC_CH_UA' ) !== 0 ) {

continue;

}

$value = trim( wp_kses( wp_unslash( (string) $value ), 'strip' ) );

if ( $value === '' ) {

continue;

}

// e.g. HTTP_SEC_CH_UA_PLATFORM -> Sec-CH-UA-Platform

$name = str_replace( ' ', '-', ucwords( strtolower( str_replace( '_', ' ', substr( $key, 5 ) ) ) ) );

$name = str_replace( 'Sec-Ch-Ua', 'Sec-CH-UA', $name );

$headers[ $name ] = $value;

}

return $headers;

}

/**

private function get_user_ip_address() {

$ip = '';

foreach ( self::PROXY_IP_HEADERS as $header ) {

if ( $this->header_exists( $header ) ) {

$ip = wp_kses( $_SERVER[ $header ], 'strip' );

if ( strpos( $ip, ',' ) !== false ) {

$ip = explode( ',', $ip );

return $ip[ 0 ];

}

return $ip;

}

}

return $ip;

}

/**

private function header_exists( $global ) {

return ! empty( $_SERVER[ $global ] );

}

/**

public function register_route() {

register_rest_route(

$this->namespace,

'/' . $this->base . '/' . $this->endpoint,

[

[

'methods' => 'POST',

'callback' => [ $this, 'send_event' ],

// There's no reason not to allow access to this API.

'permission_callback' => '__return_true',

],

'schema' => null,

]

);

}

/**

public function force_http_response_code( $response, $server, $request ) {

if ( strpos( $request->get_route(), $this->namespace ) === false ) {

return $response; // @codeCoverageIgnore

}

$response_code = wp_remote_retrieve_response_code( $response->get_data() );

$response->set_status( $response_code );

return $response;

}