*
* @param array $response
* @param string $header Header name to retrieve value from.
- * @return string The header value. Empty string on if incorrect parameter given, or if the header doesnt exist.
+ * @return string The header value. Empty string on if incorrect parameter given, or if the header doesn't exist.
*/
function wp_remote_retrieve_header(&$response, $header) {
if ( is_wp_error($response) || ! isset($response['headers']) || ! is_array($response['headers']))
* @since 3.2.0
*
* @param array $capabilities Array of capabilities to test or a wp_remote_request() $args array.
- * @param string $url Optional. If given, will check if the URL requires SSL and adds that requirement to the capabilities array.
+ * @param string $url Optional. If given, will check if the URL requires SSL and adds that requirement to the capabilities array.
*
* @return bool
*/
return (bool) $objFetchSite->_get_first_available_transport( $capabilities );
}
+
+/**
+ * Get the HTTP Origin of the current request.
+ *
+ * @since 3.4.0
+ *
+ * @return string URL of the origin. Empty string if no origin.
+ */
+function get_http_origin() {
+ $origin = '';
+ if ( ! empty ( $_SERVER[ 'HTTP_ORIGIN' ] ) )
+ $origin = $_SERVER[ 'HTTP_ORIGIN' ];
+
+ return apply_filters( 'http_origin', $origin );
+}
+
+/**
+ * Retrieve list of allowed http origins.
+ *
+ * @since 3.4.0
+ *
+ * @return array Array of origin URLs.
+ */
+function get_allowed_http_origins() {
+ $admin_origin = parse_url( admin_url() );
+ $home_origin = parse_url( home_url() );
+
+ // @todo preserve port?
+ $allowed_origins = array_unique( array(
+ 'http://' . $admin_origin[ 'host' ],
+ 'https://' . $admin_origin[ 'host' ],
+ 'http://' . $home_origin[ 'host' ],
+ 'https://' . $home_origin[ 'host' ],
+ ) );
+
+ return apply_filters( 'allowed_http_origins' , $allowed_origins );
+}
+
+/**
+ * Determines if the http origin is an authorized one.
+ *
+ * @since 3.4.0
+ *
+ * @param string Origin URL. If not provided, the value of get_http_origin() is used.
+ * @return bool True if the origin is allowed. False otherwise.
+ */
+function is_allowed_http_origin( $origin = null ) {
+ $origin_arg = $origin;
+
+ if ( null === $origin )
+ $origin = get_http_origin();
+
+ if ( $origin && ! in_array( $origin, get_allowed_http_origins() ) )
+ $origin = '';
+
+ return apply_filters( 'allowed_http_origin', $origin, $origin_arg );
+}
+
+/**
+ * Send Access-Control-Allow-Origin and related headers if the current request
+ * is from an allowed origin.
+ *
+ * @since 3.4.0
+ *
+ * @return bool|string Returns the origin URL if headers are sent. Returns false
+ * if headers are not sent.
+ */
+function send_origin_headers() {
+ $origin = get_http_origin();
+ if ( ! is_allowed_http_origin( $origin ) )
+ return false;
+
+ @header( 'Access-Control-Allow-Origin: ' . $origin );
+ @header( 'Access-Control-Allow-Credentials: true' );
+
+ return $origin;
+}
\ No newline at end of file