641 lines
20 KiB
PHP
641 lines
20 KiB
PHP
<?php
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/**
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* REST API Authentication
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*
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* @package WooCommerce\RestApi
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* @since 2.6.0
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*/
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defined( 'ABSPATH' ) || exit;
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/**
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* REST API authentication class.
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*/
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class WC_REST_Authentication {
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/**
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* Authentication error.
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*
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* @var WP_Error
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*/
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protected $error = null;
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/**
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* Logged in user data.
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*
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* @var stdClass
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*/
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protected $user = null;
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/**
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* Current auth method.
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*
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* @var string
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*/
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protected $auth_method = '';
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/**
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* Initialize authentication actions.
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*/
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public function __construct() {
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add_filter( 'determine_current_user', array( $this, 'authenticate' ), 15 );
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add_filter( 'rest_authentication_errors', array( $this, 'authentication_fallback' ) );
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add_filter( 'rest_authentication_errors', array( $this, 'check_authentication_error' ), 15 );
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add_filter( 'rest_post_dispatch', array( $this, 'send_unauthorized_headers' ), 50 );
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add_filter( 'rest_pre_dispatch', array( $this, 'check_user_permissions' ), 10, 3 );
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}
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/**
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* Check if is request to our REST API.
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*
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* @return bool
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*/
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protected function is_request_to_rest_api() {
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if ( empty( $_SERVER['REQUEST_URI'] ) ) {
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return false;
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}
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$rest_prefix = trailingslashit( rest_get_url_prefix() );
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$request_uri = esc_url_raw( wp_unslash( $_SERVER['REQUEST_URI'] ) );
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// Check if the request is to the WC API endpoints.
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$woocommerce = ( false !== strpos( $request_uri, $rest_prefix . 'wc/' ) );
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// Allow third party plugins use our authentication methods.
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$third_party = ( false !== strpos( $request_uri, $rest_prefix . 'wc-' ) );
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return apply_filters( 'woocommerce_rest_is_request_to_rest_api', $woocommerce || $third_party );
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}
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/**
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* Authenticate user.
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*
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* @param int|false $user_id User ID if one has been determined, false otherwise.
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* @return int|false
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*/
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public function authenticate( $user_id ) {
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// Do not authenticate twice and check if is a request to our endpoint in the WP REST API.
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if ( ! empty( $user_id ) || ! $this->is_request_to_rest_api() ) {
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return $user_id;
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}
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if ( is_ssl() ) {
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$user_id = $this->perform_basic_authentication();
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}
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if ( $user_id ) {
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return $user_id;
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}
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return $this->perform_oauth_authentication();
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}
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/**
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* Authenticate the user if authentication wasn't performed during the
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* determine_current_user action.
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*
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* Necessary in cases where wp_get_current_user() is called before WooCommerce is loaded.
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*
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* @see https://github.com/woocommerce/woocommerce/issues/26847
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*
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* @param WP_Error|null|bool $error Error data.
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* @return WP_Error|null|bool
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*/
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public function authentication_fallback( $error ) {
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if ( ! empty( $error ) ) {
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// Another plugin has already declared a failure.
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return $error;
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}
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if ( empty( $this->error ) && empty( $this->auth_method ) && empty( $this->user ) && 0 === get_current_user_id() ) {
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// Authentication hasn't occurred during `determine_current_user`, so check auth.
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$user_id = $this->authenticate( false );
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if ( $user_id ) {
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wp_set_current_user( $user_id );
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return true;
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}
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}
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return $error;
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}
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/**
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* Check for authentication error.
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*
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* @param WP_Error|null|bool $error Error data.
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* @return WP_Error|null|bool
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*/
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public function check_authentication_error( $error ) {
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// Pass through other errors.
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if ( ! empty( $error ) ) {
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return $error;
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}
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return $this->get_error();
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}
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/**
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* Set authentication error.
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*
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* @param WP_Error $error Authentication error data.
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*/
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protected function set_error( $error ) {
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// Reset user.
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$this->user = null;
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$this->error = $error;
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}
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/**
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* Get authentication error.
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*
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* @return WP_Error|null.
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*/
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protected function get_error() {
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return $this->error;
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}
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/**
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* Basic Authentication.
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*
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* SSL-encrypted requests are not subject to sniffing or man-in-the-middle
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* attacks, so the request can be authenticated by simply looking up the user
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* associated with the given consumer key and confirming the consumer secret
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* provided is valid.
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*
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* @return int|bool
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*/
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private function perform_basic_authentication() {
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$this->auth_method = 'basic_auth';
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$consumer_key = '';
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$consumer_secret = '';
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// If the $_GET parameters are present, use those first.
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if ( ! empty( $_GET['consumer_key'] ) && ! empty( $_GET['consumer_secret'] ) ) { // WPCS: CSRF ok.
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$consumer_key = $_GET['consumer_key']; // WPCS: CSRF ok, sanitization ok.
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$consumer_secret = $_GET['consumer_secret']; // WPCS: CSRF ok, sanitization ok.
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}
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// If the above is not present, we will do full basic auth.
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if ( ! $consumer_key && ! empty( $_SERVER['PHP_AUTH_USER'] ) && ! empty( $_SERVER['PHP_AUTH_PW'] ) ) {
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$consumer_key = $_SERVER['PHP_AUTH_USER']; // WPCS: CSRF ok, sanitization ok.
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$consumer_secret = $_SERVER['PHP_AUTH_PW']; // WPCS: CSRF ok, sanitization ok.
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}
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// Stop if don't have any key.
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if ( ! $consumer_key || ! $consumer_secret ) {
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return false;
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}
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// Get user data.
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$this->user = $this->get_user_data_by_consumer_key( $consumer_key );
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if ( empty( $this->user ) ) {
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return false;
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}
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// Validate user secret.
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if ( ! hash_equals( $this->user->consumer_secret, $consumer_secret ) ) { // @codingStandardsIgnoreLine
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$this->set_error( new WP_Error( 'woocommerce_rest_authentication_error', __( 'Consumer secret is invalid.', 'woocommerce' ), array( 'status' => 401 ) ) );
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return false;
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}
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return $this->user->user_id;
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}
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/**
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* Parse the Authorization header into parameters.
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*
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* @since 3.0.0
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*
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* @param string $header Authorization header value (not including "Authorization: " prefix).
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*
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* @return array Map of parameter values.
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*/
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public function parse_header( $header ) {
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if ( 'OAuth ' !== substr( $header, 0, 6 ) ) {
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return array();
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}
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// From OAuth PHP library, used under MIT license.
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$params = array();
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if ( preg_match_all( '/(oauth_[a-z_-]*)=(:?"([^"]*)"|([^,]*))/', $header, $matches ) ) {
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foreach ( $matches[1] as $i => $h ) {
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$params[ $h ] = urldecode( empty( $matches[3][ $i ] ) ? $matches[4][ $i ] : $matches[3][ $i ] );
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}
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if ( isset( $params['realm'] ) ) {
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unset( $params['realm'] );
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}
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}
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return $params;
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}
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/**
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* Get the authorization header.
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*
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* On certain systems and configurations, the Authorization header will be
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* stripped out by the server or PHP. Typically this is then used to
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* generate `PHP_AUTH_USER`/`PHP_AUTH_PASS` but not passed on. We use
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* `getallheaders` here to try and grab it out instead.
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*
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* @since 3.0.0
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*
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* @return string Authorization header if set.
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*/
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public function get_authorization_header() {
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if ( ! empty( $_SERVER['HTTP_AUTHORIZATION'] ) ) {
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return wp_unslash( $_SERVER['HTTP_AUTHORIZATION'] ); // WPCS: sanitization ok.
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}
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if ( function_exists( 'getallheaders' ) ) {
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$headers = getallheaders();
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// Check for the authoization header case-insensitively.
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foreach ( $headers as $key => $value ) {
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if ( 'authorization' === strtolower( $key ) ) {
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return $value;
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}
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}
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}
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return '';
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}
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/**
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* Get oAuth parameters from $_GET, $_POST or request header.
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*
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* @since 3.0.0
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*
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* @return array|WP_Error
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*/
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public function get_oauth_parameters() {
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$params = array_merge( $_GET, $_POST ); // WPCS: CSRF ok.
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$params = wp_unslash( $params );
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$header = $this->get_authorization_header();
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if ( ! empty( $header ) ) {
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// Trim leading spaces.
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$header = trim( $header );
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$header_params = $this->parse_header( $header );
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if ( ! empty( $header_params ) ) {
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$params = array_merge( $params, $header_params );
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}
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}
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$param_names = array(
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'oauth_consumer_key',
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'oauth_timestamp',
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'oauth_nonce',
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'oauth_signature',
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'oauth_signature_method',
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);
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$errors = array();
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$have_one = false;
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// Check for required OAuth parameters.
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foreach ( $param_names as $param_name ) {
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if ( empty( $params[ $param_name ] ) ) {
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$errors[] = $param_name;
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} else {
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$have_one = true;
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}
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}
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// All keys are missing, so we're probably not even trying to use OAuth.
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if ( ! $have_one ) {
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return array();
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}
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// If we have at least one supplied piece of data, and we have an error,
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// then it's a failed authentication.
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if ( ! empty( $errors ) ) {
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$message = sprintf(
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/* translators: %s: amount of errors */
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_n( 'Missing OAuth parameter %s', 'Missing OAuth parameters %s', count( $errors ), 'woocommerce' ),
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implode( ', ', $errors )
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);
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$this->set_error( new WP_Error( 'woocommerce_rest_authentication_missing_parameter', $message, array( 'status' => 401 ) ) );
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return array();
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}
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return $params;
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}
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/**
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* Perform OAuth 1.0a "one-legged" (http://oauthbible.com/#oauth-10a-one-legged) authentication for non-SSL requests.
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*
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* This is required so API credentials cannot be sniffed or intercepted when making API requests over plain HTTP.
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*
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* This follows the spec for simple OAuth 1.0a authentication (RFC 5849) as closely as possible, with two exceptions:
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*
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* 1) There is no token associated with request/responses, only consumer keys/secrets are used.
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*
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* 2) The OAuth parameters are included as part of the request query string instead of part of the Authorization header,
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* This is because there is no cross-OS function within PHP to get the raw Authorization header.
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*
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* @link http://tools.ietf.org/html/rfc5849 for the full spec.
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*
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* @return int|bool
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*/
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private function perform_oauth_authentication() {
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$this->auth_method = 'oauth1';
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$params = $this->get_oauth_parameters();
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if ( empty( $params ) ) {
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return false;
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}
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// Fetch WP user by consumer key.
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$this->user = $this->get_user_data_by_consumer_key( $params['oauth_consumer_key'] );
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if ( empty( $this->user ) ) {
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$this->set_error( new WP_Error( 'woocommerce_rest_authentication_error', __( 'Consumer key is invalid.', 'woocommerce' ), array( 'status' => 401 ) ) );
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return false;
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}
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// Perform OAuth validation.
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$signature = $this->check_oauth_signature( $this->user, $params );
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if ( is_wp_error( $signature ) ) {
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$this->set_error( $signature );
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return false;
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}
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$timestamp_and_nonce = $this->check_oauth_timestamp_and_nonce( $this->user, $params['oauth_timestamp'], $params['oauth_nonce'] );
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if ( is_wp_error( $timestamp_and_nonce ) ) {
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$this->set_error( $timestamp_and_nonce );
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return false;
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}
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return $this->user->user_id;
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}
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/**
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* Verify that the consumer-provided request signature matches our generated signature,
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* this ensures the consumer has a valid key/secret.
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*
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* @param stdClass $user User data.
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* @param array $params The request parameters.
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* @return true|WP_Error
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*/
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private function check_oauth_signature( $user, $params ) {
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$http_method = isset( $_SERVER['REQUEST_METHOD'] ) ? strtoupper( $_SERVER['REQUEST_METHOD'] ) : ''; // WPCS: sanitization ok.
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$request_path = isset( $_SERVER['REQUEST_URI'] ) ? wp_parse_url( $_SERVER['REQUEST_URI'], PHP_URL_PATH ) : ''; // WPCS: sanitization ok.
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$wp_base = get_home_url( null, '/', 'relative' );
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if ( substr( $request_path, 0, strlen( $wp_base ) ) === $wp_base ) {
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$request_path = substr( $request_path, strlen( $wp_base ) );
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}
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$base_request_uri = rawurlencode( get_home_url( null, $request_path, is_ssl() ? 'https' : 'http' ) );
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// Get the signature provided by the consumer and remove it from the parameters prior to checking the signature.
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$consumer_signature = rawurldecode( str_replace( ' ', '+', $params['oauth_signature'] ) );
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unset( $params['oauth_signature'] );
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// Sort parameters.
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if ( ! uksort( $params, 'strcmp' ) ) {
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return new WP_Error( 'woocommerce_rest_authentication_error', __( 'Invalid signature - failed to sort parameters.', 'woocommerce' ), array( 'status' => 401 ) );
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}
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// Normalize parameter key/values.
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$params = $this->normalize_parameters( $params );
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$query_string = implode( '%26', $this->join_with_equals_sign( $params ) ); // Join with ampersand.
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$string_to_sign = $http_method . '&' . $base_request_uri . '&' . $query_string;
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if ( 'HMAC-SHA1' !== $params['oauth_signature_method'] && 'HMAC-SHA256' !== $params['oauth_signature_method'] ) {
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return new WP_Error( 'woocommerce_rest_authentication_error', __( 'Invalid signature - signature method is invalid.', 'woocommerce' ), array( 'status' => 401 ) );
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}
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$hash_algorithm = strtolower( str_replace( 'HMAC-', '', $params['oauth_signature_method'] ) );
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$secret = $user->consumer_secret . '&';
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$signature = base64_encode( hash_hmac( $hash_algorithm, $string_to_sign, $secret, true ) );
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if ( ! hash_equals( $signature, $consumer_signature ) ) { // @codingStandardsIgnoreLine
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return new WP_Error( 'woocommerce_rest_authentication_error', __( 'Invalid signature - provided signature does not match.', 'woocommerce' ), array( 'status' => 401 ) );
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}
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return true;
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}
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/**
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* Creates an array of urlencoded strings out of each array key/value pairs.
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*
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* @param array $params Array of parameters to convert.
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* @param array $query_params Array to extend.
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* @param string $key Optional Array key to append.
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* @return string Array of urlencoded strings.
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*/
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private function join_with_equals_sign( $params, $query_params = array(), $key = '' ) {
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foreach ( $params as $param_key => $param_value ) {
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if ( $key ) {
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$param_key = $key . '%5B' . $param_key . '%5D'; // Handle multi-dimensional array.
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}
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if ( is_array( $param_value ) ) {
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$query_params = $this->join_with_equals_sign( $param_value, $query_params, $param_key );
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} else {
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$string = $param_key . '=' . $param_value; // Join with equals sign.
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$query_params[] = wc_rest_urlencode_rfc3986( $string );
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}
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}
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return $query_params;
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}
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/**
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* Normalize each parameter by assuming each parameter may have already been
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* encoded, so attempt to decode, and then re-encode according to RFC 3986.
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*
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* Note both the key and value is normalized so a filter param like:
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*
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* 'filter[period]' => 'week'
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*
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* is encoded to:
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*
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* 'filter%255Bperiod%255D' => 'week'
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*
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* This conforms to the OAuth 1.0a spec which indicates the entire query string
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* should be URL encoded.
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*
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* @see rawurlencode()
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* @param array $parameters Un-normalized parameters.
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* @return array Normalized parameters.
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*/
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private function normalize_parameters( $parameters ) {
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$keys = wc_rest_urlencode_rfc3986( array_keys( $parameters ) );
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$values = wc_rest_urlencode_rfc3986( array_values( $parameters ) );
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$parameters = array_combine( $keys, $values );
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return $parameters;
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}
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/**
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* Verify that the timestamp and nonce provided with the request are valid. This prevents replay attacks where
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* an attacker could attempt to re-send an intercepted request at a later time.
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*
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* - A timestamp is valid if it is within 15 minutes of now.
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* - A nonce is valid if it has not been used within the last 15 minutes.
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*
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* @param stdClass $user User data.
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* @param int $timestamp The unix timestamp for when the request was made.
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* @param string $nonce A unique (for the given user) 32 alphanumeric string, consumer-generated.
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* @return bool|WP_Error
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*/
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private function check_oauth_timestamp_and_nonce( $user, $timestamp, $nonce ) {
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global $wpdb;
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$valid_window = 15 * 60; // 15 minute window.
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if ( ( $timestamp < time() - $valid_window ) || ( $timestamp > time() + $valid_window ) ) {
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return new WP_Error( 'woocommerce_rest_authentication_error', __( 'Invalid timestamp.', 'woocommerce' ), array( 'status' => 401 ) );
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}
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$used_nonces = maybe_unserialize( $user->nonces );
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if ( empty( $used_nonces ) ) {
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$used_nonces = array();
|
|
}
|
|
|
|
if ( in_array( $nonce, $used_nonces, true ) ) {
|
|
return new WP_Error( 'woocommerce_rest_authentication_error', __( 'Invalid nonce - nonce has already been used.', 'woocommerce' ), array( 'status' => 401 ) );
|
|
}
|
|
|
|
$used_nonces[ $timestamp ] = $nonce;
|
|
|
|
// Remove expired nonces.
|
|
foreach ( $used_nonces as $nonce_timestamp => $nonce ) {
|
|
if ( $nonce_timestamp < ( time() - $valid_window ) ) {
|
|
unset( $used_nonces[ $nonce_timestamp ] );
|
|
}
|
|
}
|
|
|
|
$used_nonces = maybe_serialize( $used_nonces );
|
|
|
|
$wpdb->update(
|
|
$wpdb->prefix . 'woocommerce_api_keys',
|
|
array( 'nonces' => $used_nonces ),
|
|
array( 'key_id' => $user->key_id ),
|
|
array( '%s' ),
|
|
array( '%d' )
|
|
);
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Return the user data for the given consumer_key.
|
|
*
|
|
* @param string $consumer_key Consumer key.
|
|
* @return array
|
|
*/
|
|
private function get_user_data_by_consumer_key( $consumer_key ) {
|
|
global $wpdb;
|
|
|
|
$consumer_key = wc_api_hash( sanitize_text_field( $consumer_key ) );
|
|
$user = $wpdb->get_row(
|
|
$wpdb->prepare(
|
|
"
|
|
SELECT key_id, user_id, permissions, consumer_key, consumer_secret, nonces
|
|
FROM {$wpdb->prefix}woocommerce_api_keys
|
|
WHERE consumer_key = %s
|
|
",
|
|
$consumer_key
|
|
)
|
|
);
|
|
|
|
return $user;
|
|
}
|
|
|
|
/**
|
|
* Check that the API keys provided have the proper key-specific permissions to either read or write API resources.
|
|
*
|
|
* @param string $method Request method.
|
|
* @return bool|WP_Error
|
|
*/
|
|
private function check_permissions( $method ) {
|
|
$permissions = $this->user->permissions;
|
|
|
|
switch ( $method ) {
|
|
case 'HEAD':
|
|
case 'GET':
|
|
if ( 'read' !== $permissions && 'read_write' !== $permissions ) {
|
|
return new WP_Error( 'woocommerce_rest_authentication_error', __( 'The API key provided does not have read permissions.', 'woocommerce' ), array( 'status' => 401 ) );
|
|
}
|
|
break;
|
|
case 'POST':
|
|
case 'PUT':
|
|
case 'PATCH':
|
|
case 'DELETE':
|
|
if ( 'write' !== $permissions && 'read_write' !== $permissions ) {
|
|
return new WP_Error( 'woocommerce_rest_authentication_error', __( 'The API key provided does not have write permissions.', 'woocommerce' ), array( 'status' => 401 ) );
|
|
}
|
|
break;
|
|
case 'OPTIONS':
|
|
return true;
|
|
|
|
default:
|
|
return new WP_Error( 'woocommerce_rest_authentication_error', __( 'Unknown request method.', 'woocommerce' ), array( 'status' => 401 ) );
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Updated API Key last access datetime.
|
|
*/
|
|
private function update_last_access() {
|
|
global $wpdb;
|
|
|
|
$wpdb->update(
|
|
$wpdb->prefix . 'woocommerce_api_keys',
|
|
array( 'last_access' => current_time( 'mysql' ) ),
|
|
array( 'key_id' => $this->user->key_id ),
|
|
array( '%s' ),
|
|
array( '%d' )
|
|
);
|
|
}
|
|
|
|
/**
|
|
* If the consumer_key and consumer_secret $_GET parameters are NOT provided
|
|
* and the Basic auth headers are either not present or the consumer secret does not match the consumer
|
|
* key provided, then return the correct Basic headers and an error message.
|
|
*
|
|
* @param WP_REST_Response $response Current response being served.
|
|
* @return WP_REST_Response
|
|
*/
|
|
public function send_unauthorized_headers( $response ) {
|
|
if ( is_wp_error( $this->get_error() ) && 'basic_auth' === $this->auth_method ) {
|
|
$auth_message = __( 'WooCommerce API. Use a consumer key in the username field and a consumer secret in the password field.', 'woocommerce' );
|
|
$response->header( 'WWW-Authenticate', 'Basic realm="' . $auth_message . '"', true );
|
|
}
|
|
|
|
return $response;
|
|
}
|
|
|
|
/**
|
|
* Check for user permissions and register last access.
|
|
*
|
|
* @param mixed $result Response to replace the requested version with.
|
|
* @param WP_REST_Server $server Server instance.
|
|
* @param WP_REST_Request $request Request used to generate the response.
|
|
* @return mixed
|
|
*/
|
|
public function check_user_permissions( $result, $server, $request ) {
|
|
if ( $this->user ) {
|
|
// Check API Key permissions.
|
|
$allowed = $this->check_permissions( $request->get_method() );
|
|
if ( is_wp_error( $allowed ) ) {
|
|
return $allowed;
|
|
}
|
|
|
|
// Register last access.
|
|
$this->update_last_access();
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
}
|
|
|
|
new WC_REST_Authentication();
|