bp_document_parse_file_path( string $file_path )

function bp_document_parse_file_path( $file_path ) {
	$wp_uploads     = wp_upload_dir();
	$wp_uploads_dir = $wp_uploads['basedir'];
	$wp_uploads_url = $wp_uploads['baseurl'];

	/**
	 * Replace uploads dir, site url etc with absolute counterparts if we can.
	 * Note the str_replace on site_url is on purpose, so if https is forced
	 * via filters we can still do the string replacement on a HTTP file.
	 */
	$replacements = array(
			$wp_uploads_url                  => $wp_uploads_dir,
			network_site_url( '/', 'https' ) => ABSPATH,
			str_replace( 'https:', 'http:', network_site_url( '/', 'http' ) ) => ABSPATH,
			site_url( '/', 'https' )         => ABSPATH,
			str_replace( 'https:', 'http:', site_url( '/', 'http' ) ) => ABSPATH,
	);

	$file_path        = str_replace( array_keys( $replacements ), array_values( $replacements ), $file_path );
	$parsed_file_path = wp_parse_url( $file_path );
	$remote_file      = true;

	// Paths that begin with '//' are always remote URLs.
	if ( '//' === substr( $file_path, 0, 2 ) ) {
		return array(
				'remote_file' => true,
				'file_path'   => is_ssl() ? 'https:' . $file_path : 'http:' . $file_path,
		);
	}

	// See if path needs an abspath prepended to work.
	if ( file_exists( ABSPATH . $file_path ) ) {
		$remote_file = false;
		$file_path   = ABSPATH . $file_path;

	} elseif ( '/wp-content' === substr( $file_path, 0, 11 ) ) {
		$remote_file = false;
		$file_path   = realpath( WP_CONTENT_DIR . substr( $file_path, 11 ) );

		// Check if we have an absolute path.
	} elseif ( ( ! isset( $parsed_file_path['scheme'] ) || ! in_array( $parsed_file_path['scheme'], array( 'http', 'https', 'ftp' ), true ) ) && isset( $parsed_file_path['path'] ) && file_exists( $parsed_file_path['path'] ) ) {
		$remote_file = false;
		$file_path   = $parsed_file_path['path'];
	}

	return array(
			'remote_file' => $remote_file,
			'file_path'   => $file_path,
	);
}