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<?php
/**
* Class 'WP_URL_Pattern_Prefixer'.
*
* @package WordPress
* @subpackage Speculative Loading
* @since 6.8.0
*/
/**
* Class for prefixing URL patterns.
*
* This class is intended primarily for use as part of the speculative loading feature.
*
* @since 6.8.0
* @access private
*/
class WP_URL_Pattern_Prefixer {
/**
* Map of `$context_string => $base_path` pairs.
*
* @since 6.8.0
* @var array<string, string>
*/
private $contexts;
/**
* Constructor.
*
* @since 6.8.0
*
* @param array<string, string> $contexts Optional. Map of `$context_string => $base_path` pairs. Default is the
* contexts returned by the
* {@see WP_URL_Pattern_Prefixer::get_default_contexts()} method.
*/
public function __construct( array $contexts = array() ) {
if ( count( $contexts ) > 0 ) {
$this->contexts = array_map(
static function ( string $str ): string {
return self::escape_pattern_string( trailingslashit( $str ) );
},
$contexts
);
} else {
$this->contexts = self::get_default_contexts();
}
}
/**
* Prefixes the given URL path pattern with the base path for the given context.
*
* This ensures that these path patterns work correctly on WordPress subdirectory sites, for example in a multisite
* network, or when WordPress itself is installed in a subdirectory of the hostname.
*
* The given URL path pattern is only prefixed if it does not already include the expected prefix.
*
* @since 6.8.0
*
* @param string $path_pattern URL pattern starting with the path segment.
* @param string $context Optional. Context to use for prefixing the path pattern. Default 'home'.
* @return string URL pattern, prefixed as necessary.
*/
public function prefix_path_pattern( string $path_pattern, string $context = 'home' ): string {
// If context path does not exist, the context is invalid.
if ( ! isset( $this->contexts[ $context ] ) ) {
_doing_it_wrong(
__FUNCTION__,
esc_html(
sprintf(
/* translators: %s: context string */
__( 'Invalid URL pattern context %s.' ),
$context
)
),
'6.8.0'
);
return $path_pattern;
}
/*
* In the event that the context path contains a :, ? or # (which can cause the URL pattern parser to switch to
* another state, though only the latter two should be percent encoded anyway), it additionally needs to be
* enclosed in grouping braces. The final forward slash (trailingslashit ensures there is one) affects the
* meaning of the * wildcard, so is left outside the braces.
*/
$context_path = $this->contexts[ $context ];
$escaped_context_path = $context_path;
if ( strcspn( $context_path, ':?#' ) !== strlen( $context_path ) ) {
$escaped_context_path = '{' . substr( $context_path, 0, -1 ) . '}/';
}
/*
* If the path already starts with the context path (including '/'), remove it first
* since it is about to be added back.
*/
if ( str_starts_with( $path_pattern, $context_path ) ) {
$path_pattern = substr( $path_pattern, strlen( $context_path ) );
}
return $escaped_context_path . ltrim( $path_pattern, '/' );
}
/**
* Returns the default contexts used by the class.
*
* @since 6.8.0
*
* @return array<string, string> Map of `$context_string => $base_path` pairs.
*/
public static function get_default_contexts(): array {
return array(
'home' => self::escape_pattern_string( trailingslashit( (string) wp_parse_url( home_url( '/' ), PHP_URL_PATH ) ) ),
'site' => self::escape_pattern_string( trailingslashit( (string) wp_parse_url( site_url( '/' ), PHP_URL_PATH ) ) ),
'uploads' => self::escape_pattern_string( trailingslashit( (string) wp_parse_url( wp_upload_dir( null, false )['baseurl'], PHP_URL_PATH ) ) ),
'content' => self::escape_pattern_string( trailingslashit( (string) wp_parse_url( content_url(), PHP_URL_PATH ) ) ),
'plugins' => self::escape_pattern_string( trailingslashit( (string) wp_parse_url( plugins_url(), PHP_URL_PATH ) ) ),
'template' => self::escape_pattern_string( trailingslashit( (string) wp_parse_url( get_stylesheet_directory_uri(), PHP_URL_PATH ) ) ),
'stylesheet' => self::escape_pattern_string( trailingslashit( (string) wp_parse_url( get_template_directory_uri(), PHP_URL_PATH ) ) ),
);
}
/**
* Escapes a string for use in a URL pattern component.
*
* @since 6.8.0
* @see https://urlpattern.spec.whatwg.org/#escape-a-pattern-string
*
* @param string $str String to be escaped.
* @return string String with backslashes added where required.
*/
private static function escape_pattern_string( string $str ): string {
return addcslashes( $str, '+*?:{}()\\' );
}
}