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Either 'prefetch' or 'prerender'. * @param string $id Unique string identifier for the speculation rule. * @param array $rule Associative array of rule arguments. * @return bool True on success, false if invalid parameters are provided. */ public function add_rule( string $mode, string $id, array $rule ): bool { if ( ! self::is_valid_mode( $mode ) ) { _doing_it_wrong( __METHOD__, sprintf( /* translators: %s: invalid mode value */ __( 'The value "%s" is not a valid speculation rules mode.' ), esc_html( $mode ) ), '6.8.0' ); return false; } if ( ! $this->is_valid_id( $id ) ) { _doing_it_wrong( __METHOD__, sprintf( /* translators: %s: invalid ID value */ __( 'The value "%s" is not a valid ID for a speculation rule.' ), esc_html( $id ) ), '6.8.0' ); return false; } if ( $this->has_rule( $mode, $id ) ) { _doing_it_wrong( __METHOD__, sprintf( /* translators: %s: invalid ID value */ __( 'A speculation rule with ID "%s" already exists.' ), esc_html( $id ) ), '6.8.0' ); return false; } /* * Perform some basic speculation rule validation. * Every rule must have either a 'where' key or a 'urls' key, but not both. * The presence of a 'where' key implies a 'source' of 'document', while the presence of a 'urls' key implies * a 'source' of 'list'. */ if ( ( ! isset( $rule['where'] ) && ! isset( $rule['urls'] ) ) || ( isset( $rule['where'] ) && isset( $rule['urls'] ) ) ) { _doing_it_wrong( __METHOD__, sprintf( /* translators: 1: allowed key, 2: alternative allowed key */ __( 'A speculation rule must include either a "%1$s" key or a "%2$s" key, but not both.' ), 'where', 'urls' ), '6.8.0' ); return false; } if ( isset( $rule['source'] ) ) { if ( ! self::is_valid_source( $rule['source'] ) ) { _doing_it_wrong( __METHOD__, sprintf( /* translators: %s: invalid source value */ __( 'The value "%s" is not a valid source for a speculation rule.' ), esc_html( $rule['source'] ) ), '6.8.0' ); return false; } if ( 'list' === $rule['source'] && isset( $rule['where'] ) ) { _doing_it_wrong( __METHOD__, sprintf( /* translators: 1: source value, 2: forbidden key */ __( 'A speculation rule of source "%1$s" must not include a "%2$s" key.' ), 'list', 'where' ), '6.8.0' ); return false; } if ( 'document' === $rule['source'] && isset( $rule['urls'] ) ) { _doing_it_wrong( __METHOD__, sprintf( /* translators: 1: source value, 2: forbidden key */ __( 'A speculation rule of source "%1$s" must not include a "%2$s" key.' ), 'document', 'urls' ), '6.8.0' ); return false; } } // If there is an 'eagerness' key specified, make sure it's valid. if ( isset( $rule['eagerness'] ) ) { if ( ! self::is_valid_eagerness( $rule['eagerness'] ) ) { _doing_it_wrong( __METHOD__, sprintf( /* translators: %s: invalid eagerness value */ __( 'The value "%s" is not a valid eagerness for a speculation rule.' ), esc_html( $rule['eagerness'] ) ), '6.8.0' ); return false; } if ( isset( $rule['where'] ) && 'immediate' === $rule['eagerness'] ) { _doing_it_wrong( __METHOD__, sprintf( /* translators: %s: forbidden eagerness value */ __( 'The eagerness value "%s" is forbidden for document-level speculation rules.' ), 'immediate' ), '6.8.0' ); return false; } } if ( ! isset( $this->rules_by_mode[ $mode ] ) ) { $this->rules_by_mode[ $mode ] = array(); } $this->rules_by_mode[ $mode ][ $id ] = $rule; return true; } /** * Checks whether a speculation rule for the given mode and ID already exists. * * @since 6.8.0 * * @param string $mode Speculative loading mode. Either 'prefetch' or 'prerender'. * @param string $id Unique string identifier for the speculation rule. * @return bool True if the rule already exists, false otherwise. */ public function has_rule( string $mode, string $id ): bool { return isset( $this->rules_by_mode[ $mode ][ $id ] ); } /** * Returns the speculation rules data ready to be JSON-encoded. * * @since 6.8.0 * * @return array>> Speculation rules data. */ #[ReturnTypeWillChange] public function jsonSerialize() { // Strip the IDs for JSON output, since they are not relevant for the Speculation Rules API. return array_map( static function ( array $rules ) { return array_values( $rules ); }, array_filter( $this->rules_by_mode ) ); } /** * Checks whether the given ID is valid. * * @since 6.8.0 * * @param string $id Unique string identifier for the speculation rule. * @return bool True if the ID is valid, false otherwise. */ private function is_valid_id( string $id ): bool { return (bool) preg_match( '/^[a-z][a-z0-9_-]+$/', $id ); } /** * Checks whether the given speculation rules mode is valid. * * @since 6.8.0 * @since 7.1.0 The $mode param now allows mixed and not just string. * * @param mixed $mode Speculation rules mode. * @return bool True if valid, false otherwise. * * @phpstan-assert-if-true 'prefetch'|'prerender' $mode */ public static function is_valid_mode( $mode ): bool { return is_string( $mode ) && isset( self::$mode_allowlist[ $mode ] ); } /** * Checks whether the given speculation rules eagerness is valid. * * @since 6.8.0 * @since 7.1.0 The $eagerness param now allows mixed and not just string. * * @param mixed $eagerness Speculation rules eagerness. * @return bool True if valid, false otherwise. * * @phpstan-assert-if-true 'conservative'|'moderate'|'eager'|'immediate' $eagerness */ public static function is_valid_eagerness( $eagerness ): bool { return is_string( $eagerness ) && isset( self::$eagerness_allowlist[ $eagerness ] ); } /** * Checks whether the given speculation rules source is valid. * * @since 6.8.0 * * @param string $source Speculation rules source. * @return bool True if valid, false otherwise. */ public static function is_valid_source( string $source ): bool { return isset( self::$source_allowlist[ $source ] ); } }