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/**
 * REST API: WP_REST_Global_Styles_Controller class
 *
 * @package    WordPress
 * @subpackage REST_API
 * @since 5.9.0
 */

/**
 * Base Global Styles REST API Controller.
 */
class WP_REST_Global_Styles_Controller extends WP_REST_Posts_Controller {
	/**
	 * Whether the controller supports batching.
	 *
	 * @since 6.6.0
	 * @var array
	 */
	protected $allow_batch = array( &#039;v1&#039; =&gt; false );

	/**
	 * Constructor.
	 *
	 * @since 6.6.0
	 *
	 * @param string $post_type Post type.
	 */
	public function __construct( $post_type = &#039;wp_global_styles&#039; ) {
		parent::__construct( $post_type );
	}

	/**
	 * Registers the controllers routes.
	 *
	 * @since 5.9.0
	 */
	public function register_routes() {
		register_rest_route(
			$this-&gt;namespace,
			&#039;/&#039; . $this-&gt;rest_base . &#039;/themes/(?P&lt;stylesheet&gt;[\/\s%\w\.\(\)\[\]\@_\-]+)/variations&#039;,
			array(
				array(
					&#039;methods&#039;             =&gt; WP_REST_Server::READABLE,
					&#039;callback&#039;            =&gt; array( $this, &#039;get_theme_items&#039; ),
					&#039;permission_callback&#039; =&gt; array( $this, &#039;get_theme_items_permissions_check&#039; ),
					&#039;args&#039;                =&gt; array(
						&#039;stylesheet&#039; =&gt; array(
							&#039;description&#039; =&gt; __( &#039;The theme identifier&#039; ),
							&#039;type&#039;        =&gt; &#039;string&#039;,
						),
					),
					&#039;allow_batch&#039;         =&gt; $this-&gt;allow_batch,
				),
			)
		);

		// List themes global styles.
		register_rest_route(
			$this-&gt;namespace,
			// The route.
			sprintf(
				&#039;/%s/themes/(?P&lt;stylesheet&gt;%s)&#039;,
				$this-&gt;rest_base,
				/*
				 * Matches theme&#039;s directory: `/themes/&lt;subdirectory&gt;/&lt;theme&gt;/` or `/themes/&lt;theme&gt;/`.
				 * Excludes invalid directory name characters: `/:&lt;&gt;*?&quot;|`.
				 */
				&#039;[^\/:&lt;&gt;\*\?&quot;\|]+(?:\/[^\/:&lt;&gt;\*\?&quot;\|]+)?&#039;
			),
			array(
				array(
					&#039;methods&#039;             =&gt; WP_REST_Server::READABLE,
					&#039;callback&#039;            =&gt; array( $this, &#039;get_theme_item&#039; ),
					&#039;permission_callback&#039; =&gt; array( $this, &#039;get_theme_item_permissions_check&#039; ),
					&#039;args&#039;                =&gt; array(
						&#039;stylesheet&#039; =&gt; array(
							&#039;description&#039;       =&gt; __( &#039;The theme identifier&#039; ),
							&#039;type&#039;              =&gt; &#039;string&#039;,
							&#039;sanitize_callback&#039; =&gt; array( $this, &#039;_sanitize_global_styles_callback&#039; ),
						),
					),
					&#039;allow_batch&#039;         =&gt; $this-&gt;allow_batch,
				),
			)
		);

		// Lists/updates a single global style variation based on the given id.
		register_rest_route(
			$this-&gt;namespace,
			&#039;/&#039; . $this-&gt;rest_base . &#039;/(?P&lt;id&gt;[\/\d+]+)&#039;,
			array(
				array(
					&#039;methods&#039;             =&gt; WP_REST_Server::READABLE,
					&#039;callback&#039;            =&gt; array( $this, &#039;get_item&#039; ),
					&#039;permission_callback&#039; =&gt; array( $this, &#039;get_item_permissions_check&#039; ),
					&#039;args&#039;                =&gt; array(
						&#039;id&#039; =&gt; array(
							&#039;description&#039; =&gt; __( &#039;ID of global styles config.&#039; ),
							&#039;type&#039;        =&gt; &#039;integer&#039;,
						),
					),
				),
				array(
					&#039;methods&#039;             =&gt; WP_REST_Server::EDITABLE,
					&#039;callback&#039;            =&gt; array( $this, &#039;update_item&#039; ),
					&#039;permission_callback&#039; =&gt; array( $this, &#039;update_item_permissions_check&#039; ),
					&#039;args&#039;                =&gt; $this-&gt;get_endpoint_args_for_item_schema( WP_REST_Server::EDITABLE ),
				),
				&#039;schema&#039;      =&gt; array( $this, &#039;get_public_item_schema&#039; ),
				&#039;allow_batch&#039; =&gt; $this-&gt;allow_batch,
			)
		);
	}

	/**
	 * Sanitize the global styles stylesheet to decode endpoint.
	 * For example, `wp/v2/global-styles/twentytwentytwo%200.4.0`
	 * would be decoded to `twentytwentytwo 0.4.0`.
	 *
	 * @since 5.9.0
	 *
	 * @param string $stylesheet Global styles stylesheet.
	 * @return string Sanitized global styles stylesheet.
	 */
	public function _sanitize_global_styles_callback( $stylesheet ) {
		return urldecode( $stylesheet );
	}

	/**
	 * Get the post, if the ID is valid.
	 *
	 * @since 5.9.0
	 *
	 * @param int $id Supplied ID.
	 * @return WP_Post|WP_Error Post object if ID is valid, WP_Error otherwise.
	 */
	protected function get_post( $id ) {
		$error = new WP_Error(
			&#039;rest_global_styles_not_found&#039;,
			__( &#039;No global styles config exists with that ID.&#039; ),
			array( &#039;status&#039; =&gt; 404 )
		);

		$id = (int) $id;
		if ( $id &lt;= 0 ) {
			return $error;
		}

		$post = get_post( $id );
		if ( empty( $post ) || empty( $post-&gt;ID ) || $this-&gt;post_type !== $post-&gt;post_type ) {
			return $error;
		}

		return $post;
	}

	/**
	 * Checks if a given request has access to read a single global style.
	 *
	 * @since 5.9.0
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return true|WP_Error True if the request has read access, WP_Error object otherwise.
	 */
	public function get_item_permissions_check( $request ) {
		$post = $this-&gt;get_post( $request[&#039;id&#039;] );
		if ( is_wp_error( $post ) ) {
			return $post;
		}

		if ( &#039;edit&#039; === $request[&#039;context&#039;] &amp;&amp; $post &amp;&amp; ! $this-&gt;check_update_permission( $post ) ) {
			return new WP_Error(
				&#039;rest_forbidden_context&#039;,
				__( &#039;Sorry, you are not allowed to edit this global style.&#039; ),
				array( &#039;status&#039; =&gt; rest_authorization_required_code() )
			);
		}

		if ( ! $this-&gt;check_read_permission( $post ) ) {
			return new WP_Error(
				&#039;rest_cannot_view&#039;,
				__( &#039;Sorry, you are not allowed to view this global style.&#039; ),
				array( &#039;status&#039; =&gt; rest_authorization_required_code() )
			);
		}

		return true;
	}

	/**
	 * Checks if a global style can be read.
	 *
	 * @since 5.9.0
	 *
	 * @param WP_Post $post Post object.
	 * @return bool Whether the post can be read.
	 */
	public function check_read_permission( $post ) {
		return current_user_can( &#039;read_post&#039;, $post-&gt;ID );
	}

	/**
	 * Checks if a given request has access to write a single global styles config.
	 *
	 * @since 5.9.0
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return true|WP_Error True if the request has write access for the item, WP_Error object otherwise.
	 */
	public function update_item_permissions_check( $request ) {
		$post = $this-&gt;get_post( $request[&#039;id&#039;] );
		if ( is_wp_error( $post ) ) {
			return $post;
		}

		if ( $post &amp;&amp; ! $this-&gt;check_update_permission( $post ) ) {
			return new WP_Error(
				&#039;rest_cannot_edit&#039;,
				__( &#039;Sorry, you are not allowed to edit this global style.&#039; ),
				array( &#039;status&#039; =&gt; rest_authorization_required_code() )
			);
		}

		return true;
	}

	/**
	 * Prepares a single global styles config for update.
	 *
	 * @since 5.9.0
	 * @since 6.2.0 Added validation of styles.css property.
	 * @since 6.6.0 Added registration of block style variations from theme.json sources (theme.json, user theme.json, partials).
	 *
	 * @param WP_REST_Request $request Request object.
	 * @return stdClass|WP_Error Prepared item on success. WP_Error on when the custom CSS is not valid.
	 */
	protected function prepare_item_for_database( $request ) {
		$changes     = new stdClass();
		$changes-&gt;ID = $request[&#039;id&#039;];

		$post            = get_post( $request[&#039;id&#039;] );
		$existing_config = array();
		if ( $post ) {
			$existing_config     = json_decode( $post-&gt;post_content, true );
			$json_decoding_error = json_last_error();
			if ( JSON_ERROR_NONE !== $json_decoding_error || ! isset( $existing_config[&#039;isGlobalStylesUserThemeJSON&#039;] ) ||
				! $existing_config[&#039;isGlobalStylesUserThemeJSON&#039;] ) {
				$existing_config = array();
			}
		}

		if ( isset( $request[&#039;styles&#039;] ) || isset( $request[&#039;settings&#039;] ) ) {
			$config = array();
			if ( isset( $request[&#039;styles&#039;] ) ) {
				if ( isset( $request[&#039;styles&#039;][&#039;css&#039;] ) ) {
					$css_validation_result = $this-&gt;validate_custom_css( $request[&#039;styles&#039;][&#039;css&#039;] );
					if ( is_wp_error( $css_validation_result ) ) {
						return $css_validation_result;
					}
				}
				$config[&#039;styles&#039;] = $request[&#039;styles&#039;];
			} elseif ( isset( $existing_config[&#039;styles&#039;] ) ) {
				$config[&#039;styles&#039;] = $existing_config[&#039;styles&#039;];
			}

			// Register theme-defined variations e.g. from block style variation partials under `/styles`.
			$variations = WP_Theme_JSON_Resolver::get_style_variations( &#039;block&#039; );
			wp_register_block_style_variations_from_theme_json_partials( $variations );

			if ( isset( $request[&#039;settings&#039;] ) ) {
				$config[&#039;settings&#039;] = $request[&#039;settings&#039;];
			} elseif ( isset( $existing_config[&#039;settings&#039;] ) ) {
				$config[&#039;settings&#039;] = $existing_config[&#039;settings&#039;];
			}
			$config[&#039;isGlobalStylesUserThemeJSON&#039;] = true;
			$config[&#039;version&#039;]                     = WP_Theme_JSON::LATEST_SCHEMA;
			/**
			 * JSON encode the data stored in post content.
			 * Escape characters that are likely to be mangled by HTML filters: &quot;&lt;&gt;&amp;&quot;.
			 *
			 * This data is later re-encoded by {@see wp_filter_global_styles_post()}.
			 * The escaping is also applied here as a precaution.
			 */
			$changes-&gt;post_content = wp_json_encode( $config, JSON_UNESCAPED_SLASHES | JSON_HEX_TAG | JSON_HEX_AMP );
		}

		// Post title.
		if ( isset( $request[&#039;title&#039;] ) ) {
			if ( is_string( $request[&#039;title&#039;] ) ) {
				$changes-&gt;post_title = $request[&#039;title&#039;];
			} elseif ( ! empty( $request[&#039;title&#039;][&#039;raw&#039;] ) ) {
				$changes-&gt;post_title = $request[&#039;title&#039;][&#039;raw&#039;];
			}
		}

		return $changes;
	}

	/**
	 * Prepare a global styles config output for response.
	 *
	 * @since 5.9.0
	 * @since 6.6.0 Added custom relative theme file URIs to `_links`.
	 *
	 * @param WP_Post         $post    Global Styles post object.
	 * @param WP_REST_Request $request Request object.
	 * @return WP_REST_Response Response object.
	 */
	public function prepare_item_for_response( $post, $request ) {
		$raw_config                       = json_decode( $post-&gt;post_content, true );
		$is_global_styles_user_theme_json = isset( $raw_config[&#039;isGlobalStylesUserThemeJSON&#039;] ) &amp;&amp; true === $raw_config[&#039;isGlobalStylesUserThemeJSON&#039;];
		$config                           = array();
		$theme_json                       = null;
		if ( $is_global_styles_user_theme_json ) {
			$theme_json = new WP_Theme_JSON( $raw_config, &#039;custom&#039; );
			$config     = $theme_json-&gt;get_raw_data();
		}

		// Base fields for every post.
		$fields = $this-&gt;get_fields_for_response( $request );
		$data   = array();

		if ( rest_is_field_included( &#039;id&#039;, $fields ) ) {
			$data[&#039;id&#039;] = $post-&gt;ID;
		}

		if ( rest_is_field_included( &#039;title&#039;, $fields ) ) {
			$data[&#039;title&#039;] = array();
		}
		if ( rest_is_field_included( &#039;title.raw&#039;, $fields ) ) {
			$data[&#039;title&#039;][&#039;raw&#039;] = $post-&gt;post_title;
		}
		if ( rest_is_field_included( &#039;title.rendered&#039;, $fields ) ) {
			add_filter( &#039;protected_title_format&#039;, array( $this, &#039;protected_title_format&#039; ) );
			add_filter( &#039;private_title_format&#039;, array( $this, &#039;protected_title_format&#039; ) );

			$data[&#039;title&#039;][&#039;rendered&#039;] = get_the_title( $post-&gt;ID );

			remove_filter( &#039;protected_title_format&#039;, array( $this, &#039;protected_title_format&#039; ) );
			remove_filter( &#039;private_title_format&#039;, array( $this, &#039;protected_title_format&#039; ) );
		}

		if ( rest_is_field_included( &#039;settings&#039;, $fields ) ) {
			$data[&#039;settings&#039;] = ! empty( $config[&#039;settings&#039;] ) &amp;&amp; $is_global_styles_user_theme_json ? $config[&#039;settings&#039;] : new stdClass();
		}

		if ( rest_is_field_included( &#039;styles&#039;, $fields ) ) {
			$data[&#039;styles&#039;] = ! empty( $config[&#039;styles&#039;] ) &amp;&amp; $is_global_styles_user_theme_json ? $config[&#039;styles&#039;] : new stdClass();
		}

		$context = ! empty( $request[&#039;context&#039;] ) ? $request[&#039;context&#039;] : &#039;view&#039;;
		$data    = $this-&gt;add_additional_fields_to_object( $data, $request );
		$data    = $this-&gt;filter_response_by_context( $data, $context );

		// Wrap the data in a response object.
		$response = rest_ensure_response( $data );

		if ( rest_is_field_included( &#039;_links&#039;, $fields ) || rest_is_field_included( &#039;_embedded&#039;, $fields ) ) {
			$links = $this-&gt;prepare_links( $post-&gt;ID );

			// Only return resolved URIs for get requests to user theme JSON.
			if ( $theme_json ) {
				$resolved_theme_uris = WP_Theme_JSON_Resolver::get_resolved_theme_uris( $theme_json );
				if ( ! empty( $resolved_theme_uris ) ) {
					$links[&#039;https://api.w.org/theme-file&#039;] = $resolved_theme_uris;
				}
			}

			$response-&gt;add_links( $links );
			if ( ! empty( $links[&#039;self&#039;][&#039;href&#039;] ) ) {
				$actions = $this-&gt;get_available_actions( $post, $request );
				$self    = $links[&#039;self&#039;][&#039;href&#039;];
				foreach ( $actions as $rel ) {
					$response-&gt;add_link( $rel, $self );
				}
			}
		}

		return $response;
	}

	/**
	 * Prepares links for the request.
	 *
	 * @since 5.9.0
	 * @since 6.3.0 Adds revisions count and rest URL href to version-history.
	 *
	 * @param integer $id ID.
	 * @return array Links for the given post.
	 */
	protected function prepare_links( $id ) {
		$base = sprintf( &#039;%s/%s&#039;, $this-&gt;namespace, $this-&gt;rest_base );

		$links = array(
			&#039;self&#039;  =&gt; array(
				&#039;href&#039; =&gt; rest_url( trailingslashit( $base ) . $id ),
			),
			&#039;about&#039; =&gt; array(
				&#039;href&#039; =&gt; rest_url( &#039;wp/v2/types/&#039; . $this-&gt;post_type ),
			),
		);

		if ( post_type_supports( $this-&gt;post_type, &#039;revisions&#039; ) ) {
			$revisions                = wp_get_latest_revision_id_and_total_count( $id );
			$revisions_count          = ! is_wp_error( $revisions ) ? $revisions[&#039;count&#039;] : 0;
			$revisions_base           = sprintf( &#039;/%s/%d/revisions&#039;, $base, $id );
			$links[&#039;version-history&#039;] = array(
				&#039;href&#039;  =&gt; rest_url( $revisions_base ),
				&#039;count&#039; =&gt; $revisions_count,
			);
		}

		return $links;
	}

	/**
	 * Get the link relations available for the post and current user.
	 *
	 * @since 5.9.0
	 * @since 6.2.0 Added &#039;edit-css&#039; action.
	 * @since 6.6.0 Added $post and $request parameters.
	 *
	 * @param WP_Post         $post    Post object.
	 * @param WP_REST_Request $request Request object.
	 * @return array List of link relations.
	 */
	protected function get_available_actions( $post, $request ) {
		$rels = array();

		$post_type = get_post_type_object( $post-&gt;post_type );
		if ( current_user_can( $post_type-&gt;cap-&gt;publish_posts ) ) {
			$rels[] = &#039;https://api.w.org/action-publish&#039;;
		}

		if ( current_user_can( &#039;edit_css&#039; ) ) {
			$rels[] = &#039;https://api.w.org/action-edit-css&#039;;
		}

		return $rels;
	}

	/**
	 * Retrieves the query params for the global styles collection.
	 *
	 * @since 5.9.0
	 *
	 * @return array Collection parameters.
	 */
	public function get_collection_params() {
		return array();
	}

	/**
	 * Retrieves the global styles type&#039; schema, conforming to JSON Schema.
	 *
	 * @since 5.9.0
	 *
	 * @return array Item schema data.
	 */
	public function get_item_schema() {
		if ( $this-&gt;schema ) {
			return $this-&gt;add_additional_fields_schema( $this-&gt;schema );
		}

		$schema = array(
			&#039;$schema&#039;    =&gt; &#039;http://json-schema.org/draft-04/schema#&#039;,
			&#039;title&#039;      =&gt; $this-&gt;post_type,
			&#039;type&#039;       =&gt; &#039;object&#039;,
			&#039;properties&#039; =&gt; array(
				&#039;id&#039;       =&gt; array(
					&#039;description&#039; =&gt; __( &#039;ID of global styles config.&#039; ),
					&#039;type&#039;        =&gt; &#039;integer&#039;,
					&#039;context&#039;     =&gt; array( &#039;embed&#039;, &#039;view&#039;, &#039;edit&#039; ),
					&#039;readonly&#039;    =&gt; true,
				),
				&#039;styles&#039;   =&gt; array(
					&#039;description&#039; =&gt; __( &#039;Global styles.&#039; ),
					&#039;type&#039;        =&gt; array( &#039;object&#039; ),
					&#039;context&#039;     =&gt; array( &#039;view&#039;, &#039;edit&#039; ),
				),
				&#039;settings&#039; =&gt; array(
					&#039;description&#039; =&gt; __( &#039;Global settings.&#039; ),
					&#039;type&#039;        =&gt; array( &#039;object&#039; ),
					&#039;context&#039;     =&gt; array( &#039;view&#039;, &#039;edit&#039; ),
				),
				&#039;title&#039;    =&gt; array(
					&#039;description&#039; =&gt; __( &#039;Title of the global styles variation.&#039; ),
					&#039;type&#039;        =&gt; array( &#039;object&#039;, &#039;string&#039; ),
					&#039;default&#039;     =&gt; &#039;&#039;,
					&#039;context&#039;     =&gt; array( &#039;embed&#039;, &#039;view&#039;, &#039;edit&#039; ),
					&#039;properties&#039;  =&gt; array(
						&#039;raw&#039;      =&gt; array(
							&#039;description&#039; =&gt; __( &#039;Title for the global styles variation, as it exists in the database.&#039; ),
							&#039;type&#039;        =&gt; &#039;string&#039;,
							&#039;context&#039;     =&gt; array( &#039;view&#039;, &#039;edit&#039;, &#039;embed&#039; ),
						),
						&#039;rendered&#039; =&gt; array(
							&#039;description&#039; =&gt; __( &#039;HTML title for the post, transformed for display.&#039; ),
							&#039;type&#039;        =&gt; &#039;string&#039;,
							&#039;context&#039;     =&gt; array( &#039;view&#039;, &#039;edit&#039;, &#039;embed&#039; ),
							&#039;readonly&#039;    =&gt; true,
						),
					),
				),
			),
		);

		$this-&gt;schema = $schema;

		return $this-&gt;add_additional_fields_schema( $this-&gt;schema );
	}

	/**
	 * Checks if a given request has access to read a single theme global styles config.
	 *
	 * @since 5.9.0
	 * @since 6.7.0 Allow users with edit post capabilities to view theme global styles.
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return true|WP_Error True if the request has read access for the item, WP_Error object otherwise.
	 */
	public function get_theme_item_permissions_check( $request ) {
		/*
		 * Verify if the current user has edit_posts capability.
		 * This capability is required to view global styles.
		 */
		if ( current_user_can( &#039;edit_posts&#039; ) ) {
			return true;
		}

		foreach ( get_post_types( array( &#039;show_in_rest&#039; =&gt; true ), &#039;objects&#039; ) as $post_type ) {
			if ( current_user_can( $post_type-&gt;cap-&gt;edit_posts ) ) {
				return true;
			}
		}

		/*
		 * Verify if the current user has edit_theme_options capability.
		 */
		if ( current_user_can( &#039;edit_theme_options&#039; ) ) {
			return true;
		}

		return new WP_Error(
			&#039;rest_cannot_read_global_styles&#039;,
			__( &#039;Sorry, you are not allowed to access the global styles on this site.&#039; ),
			array(
				&#039;status&#039; =&gt; rest_authorization_required_code(),
			)
		);
	}

	/**
	 * Returns the given theme global styles config.
	 *
	 * @since 5.9.0
	 * @since 6.6.0 Added custom relative theme file URIs to `_links`.
	 *
	 * @param WP_REST_Request $request The request instance.
	 * @return WP_REST_Response|WP_Error
	 */
	public function get_theme_item( $request ) {
		if ( get_stylesheet() !== $request[&#039;stylesheet&#039;] ) {
			// This endpoint only supports the active theme for now.
			return new WP_Error(
				&#039;rest_theme_not_found&#039;,
				__( &#039;Theme not found.&#039; ),
				array( &#039;status&#039; =&gt; 404 )
			);
		}

		$theme  = WP_Theme_JSON_Resolver::get_merged_data( &#039;theme&#039; );
		$fields = $this-&gt;get_fields_for_response( $request );
		$data   = array();

		if ( rest_is_field_included( &#039;settings&#039;, $fields ) ) {
			$data[&#039;settings&#039;] = $theme-&gt;get_settings();
		}

		if ( rest_is_field_included( &#039;styles&#039;, $fields ) ) {
			$raw_data       = $theme-&gt;get_raw_data();
			$data[&#039;styles&#039;] = $raw_data[&#039;styles&#039;] ?? array();
		}

		$context = ! empty( $request[&#039;context&#039;] ) ? $request[&#039;context&#039;] : &#039;view&#039;;
		$data    = $this-&gt;add_additional_fields_to_object( $data, $request );
		$data    = $this-&gt;filter_response_by_context( $data, $context );

		$response = rest_ensure_response( $data );

		if ( rest_is_field_included( &#039;_links&#039;, $fields ) || rest_is_field_included( &#039;_embedded&#039;, $fields ) ) {
			$links               = array(
				&#039;self&#039; =&gt; array(
					&#039;href&#039; =&gt; rest_url( sprintf( &#039;%s/%s/themes/%s&#039;, $this-&gt;namespace, $this-&gt;rest_base, $request[&#039;stylesheet&#039;] ) ),
				),
			);
			$resolved_theme_uris = WP_Theme_JSON_Resolver::get_resolved_theme_uris( $theme );
			if ( ! empty( $resolved_theme_uris ) ) {
				$links[&#039;https://api.w.org/theme-file&#039;] = $resolved_theme_uris;
			}
			$response-&gt;add_links( $links );
		}

		return $response;
	}

	/**
	 * Checks if a given request has access to read a single theme global styles config.
	 *
	 * @since 6.0.0
	 * @since 6.7.0 Allow users with edit post capabilities to view theme global styles.
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return true|WP_Error True if the request has read access for the item, WP_Error object otherwise.
	 */
	public function get_theme_items_permissions_check( $request ) {
		return $this-&gt;get_theme_item_permissions_check( $request );
	}

	/**
	 * Returns the given theme global styles variations.
	 *
	 * @since 6.0.0
	 * @since 6.2.0 Returns parent theme variations, if they exist.
	 * @since 6.6.0 Added custom relative theme file URIs to `_links` for each item.
	 *
	 * @param WP_REST_Request $request The request instance.
	 *
	 * @return WP_REST_Response|WP_Error
	 */
	public function get_theme_items( $request ) {
		if ( get_stylesheet() !== $request[&#039;stylesheet&#039;] ) {
			// This endpoint only supports the active theme for now.
			return new WP_Error(
				&#039;rest_theme_not_found&#039;,
				__( &#039;Theme not found.&#039; ),
				array( &#039;status&#039; =&gt; 404 )
			);
		}

		$response = array();

		// Register theme-defined variations e.g. from block style variation partials under `/styles`.
		$partials = WP_Theme_JSON_Resolver::get_style_variations( &#039;block&#039; );
		wp_register_block_style_variations_from_theme_json_partials( $partials );

		$variations = WP_Theme_JSON_Resolver::get_style_variations();
		foreach ( $variations as $variation ) {
			$variation_theme_json = new WP_Theme_JSON( $variation );
			$resolved_theme_uris  = WP_Theme_JSON_Resolver::get_resolved_theme_uris( $variation_theme_json );
			$data                 = rest_ensure_response( $variation );
			if ( ! empty( $resolved_theme_uris ) ) {
				$data-&gt;add_links(
					array(
						&#039;https://api.w.org/theme-file&#039; =&gt; $resolved_theme_uris,
					)
				);
			}
			$response[] = $this-&gt;prepare_response_for_collection( $data );
		}

		return rest_ensure_response( $response );
	}

	/**
	 * Validate style.css as valid CSS.
	 *
	 * Currently just checks that CSS will not break an HTML STYLE tag.
	 *
	 * @since 6.2.0
	 * @since 6.4.0 Changed method visibility to protected.
	 * @since 7.0.0 Only restricts contents which risk prematurely closing the STYLE element,
	 *              either through a STYLE end tag or a prefix of one which might become a
	 *              full end tag when combined with the contents of other styles.
	 *
	 * @see WP_Customize_Custom_CSS_Setting::validate()
	 *
	 * @param string $css CSS to validate.
	 * @return true|WP_Error True if the input was validated, otherwise WP_Error.
	 */
	protected function validate_custom_css( $css ) {
		$length = strlen( $css );
		for (
			$at = strcspn( $css, &#039;&lt;&#039; );
			$at &lt; $length;
			$at += strcspn( $css, &#039;&lt;&#039;, ++$at )
		) {
			$remaining_strlen = $length - $at;
			/**
			 * Custom CSS text is expected to render inside an HTML STYLE element.
			 * A STYLE closing tag must not appear within the CSS text because it
			 * would close the element prematurely.
			 *
			 * The text must also *not* end with a partial closing tag (e.g., `&lt;`,
			 * `&lt;/`, … `&lt;/style`) because subsequent styles which are concatenated
			 * could complete it, forming a valid `&lt;/style&gt;` tag.
			 *
			 * Example:
			 *
			 *     $style_a = &#039;p { font-weight: bold; &lt;/sty&#039;;
			 *     $style_b = &#039;le&gt; gotcha!&#039;;
			 *     $combined = &quot;{$style_a}{$style_b}&quot;;
			 *
			 *     $style_a = &#039;p { font-weight: bold; &lt;/style&#039;;
			 *     $style_b = &#039;p &gt; b { color: red; }&#039;;
			 *     $combined = &quot;{$style_a}\n{$style_b}&quot;;
			 *
			 * Note how in the second example, both of the style contents are benign
			 * when analyzed on their own. The first style was likely the result of
			 * improper truncation, while the second is perfectly sound. It was only
			 * through concatenation that these two styles combined to form content
			 * that would have broken out of the containing STYLE element, thus
			 * corrupting the page and potentially introducing security issues.
			 *
			 * @link https://html.spec.whatwg.org/multipage/parsing.html#rawtext-end-tag-name-state
			 */
			$possible_style_close_tag = 0 === substr_compare(
				$css,
				&#039;&lt;/style&#039;,
				$at,
				min( 7, $remaining_strlen ),
				true
			);
			if ( $possible_style_close_tag ) {
				if ( $remaining_strlen &lt; 8 ) {
					return new WP_Error(
						&#039;rest_custom_css_illegal_markup&#039;,
						sprintf(
							/* translators: %s is the CSS that was provided. */
							__( &#039;The CSS must not end in &quot;%s&quot;.&#039; ),
							esc_html( substr( $css, $at ) )
						),
						array( &#039;status&#039; =&gt; 400 )
					);
				}

				if ( 1 === strspn( $css, &quot; \t\f\r\n/&gt;&quot;, $at + 7, 1 ) ) {
					return new WP_Error(
						&#039;rest_custom_css_illegal_markup&#039;,
						sprintf(
							/* translators: %s is the CSS that was provided. */
							__( &#039;The CSS must not contain &quot;%s&quot;.&#039; ),
							esc_html( substr( $css, $at, 8 ) )
						),
						array( &#039;status&#039; =&gt; 400 )
					);
				}
			}
		}

		return true;
	}
}
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