378 lines
11 KiB
PHP
378 lines
11 KiB
PHP
<?php
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/**
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* Customize API: WP_Customize_Custom_CSS_Setting class
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*
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* This handles validation, sanitization and saving of the value.
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*
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* @package WordPress
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* @subpackage Customize
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* @since 4.7.0
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*/
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/**
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* Custom Setting to handle WP Custom CSS.
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*
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* @since 4.7.0
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*
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* @see WP_Customize_Setting
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*/
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final class WP_Customize_Custom_CSS_Setting extends WP_Customize_Setting {
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/**
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* The setting type.
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*
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* @var string
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*
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* @since 4.7.0
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* @access public
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*/
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public $type = 'custom_css';
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/**
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* Setting Transport
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*
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* @since 4.7.0
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* @access public
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*
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* @var string
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*/
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public $transport = 'postMessage';
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/**
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* Capability required to edit this setting.
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*
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* @since 4.7.0
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* @access public
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*
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* @var string
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*/
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public $capability = 'unfiltered_css';
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/**
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* Stylesheet
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*
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* @since 4.7.0
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* @access public
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*
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* @var string
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*/
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public $stylesheet = '';
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/**
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* WP_Customize_Custom_CSS_Setting constructor.
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*
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* @since 4.7.0
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* @access public
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*
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* @throws Exception If the setting ID does not match the pattern `custom_css[$stylesheet]`.
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*
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* @param WP_Customize_Manager $manager The Customize Manager class.
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* @param string $id An specific ID of the setting. Can be a
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* theme mod or option name.
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* @param array $args Setting arguments.
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*/
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public function __construct( $manager, $id, $args = array() ) {
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parent::__construct( $manager, $id, $args );
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if ( 'custom_css' !== $this->id_data['base'] ) {
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throw new Exception( 'Expected custom_css id_base.' );
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}
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if ( 1 !== count( $this->id_data['keys'] ) || empty( $this->id_data['keys'][0] ) ) {
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throw new Exception( 'Expected single stylesheet key.' );
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}
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$this->stylesheet = $this->id_data['keys'][0];
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}
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/**
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* Add filter to preview post value.
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*
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* @since 4.7.9
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* @access public
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*
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* @return bool False when preview short-circuits due no change needing to be previewed.
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*/
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public function preview() {
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if ( $this->is_previewed ) {
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return false;
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}
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$this->is_previewed = true;
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add_filter( 'wp_get_custom_css', array( $this, 'filter_previewed_wp_get_custom_css' ), 9, 2 );
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return true;
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}
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/**
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* Filter wp_get_custom_css for applying customized value to return value.
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*
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* @since 4.7.0
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* @access private
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*
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* @param string $css Original CSS.
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* @param string $stylesheet Current stylesheet.
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* @return string CSS.
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*/
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public function filter_previewed_wp_get_custom_css( $css, $stylesheet ) {
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if ( $stylesheet === $this->stylesheet ) {
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$customized_value = $this->post_value( null );
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if ( ! is_null( $customized_value ) ) {
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$css = $customized_value;
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}
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}
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return $css;
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}
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/**
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* Fetch the value of the setting.
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*
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* @since 4.7.0
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* @access public
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*
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* @return string
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*/
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public function value() {
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$value = wp_get_custom_css( $this->stylesheet );
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if ( empty( $value ) ) {
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$value = $this->default;
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}
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return $value;
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}
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/**
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* Validate CSS.
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*
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* Checks for imbalanced braces, brackets, and comments.
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* Notifications are rendered when the customizer state is saved.
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*
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* @todo There are cases where valid CSS can be incorrectly marked as invalid when strings or comments include balancing characters. To fix, CSS tokenization needs to be used.
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*
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* @since 4.7.0
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* @access public
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*
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* @param string $css The input string.
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* @return true|WP_Error True if the input was validated, otherwise WP_Error.
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*/
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public function validate( $css ) {
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$validity = new WP_Error();
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if ( preg_match( '#</?\w+#', $css ) ) {
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$validity->add( 'illegal_markup', __( 'Markup is not allowed in CSS.' ) );
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}
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$imbalanced = false;
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// Make sure that there is a closing brace for each opening brace.
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if ( ! $this->validate_balanced_characters( '{', '}', $css ) ) {
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$validity->add( 'imbalanced_curly_brackets', __( 'Your curly brackets <code>{}</code> are imbalanced. Make sure there is a closing <code>}</code> for every opening <code>{</code>.' ) );
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$imbalanced = true;
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}
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// Ensure brackets are balanced.
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if ( ! $this->validate_balanced_characters( '[', ']', $css ) ) {
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$validity->add( 'imbalanced_braces', __( 'Your brackets <code>[]</code> are imbalanced. Make sure there is a closing <code>]</code> for every opening <code>[</code>.' ) );
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$imbalanced = true;
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}
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// Ensure parentheses are balanced.
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if ( ! $this->validate_balanced_characters( '(', ')', $css ) ) {
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$validity->add( 'imbalanced_parentheses', __( 'Your parentheses <code>()</code> are imbalanced. Make sure there is a closing <code>)</code> for every opening <code>(</code>.' ) );
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$imbalanced = true;
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}
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// Ensure single quotes are equal.
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if ( ! $this->validate_equal_characters( '\'', $css ) ) {
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$validity->add( 'unequal_single_quotes', __( 'Your single quotes <code>\'</code> are uneven. Make sure there is a closing <code>\'</code> for every opening <code>\'</code>.' ) );
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$imbalanced = true;
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}
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// Ensure single quotes are equal.
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if ( ! $this->validate_equal_characters( '"', $css ) ) {
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$validity->add( 'unequal_double_quotes', __( 'Your double quotes <code>"</code> are uneven. Make sure there is a closing <code>"</code> for every opening <code>"</code>.' ) );
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$imbalanced = true;
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}
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/*
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* Make sure any code comments are closed properly.
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*
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* The first check could miss stray an unpaired comment closing figure, so if
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* The number appears to be balanced, then check for equal numbers
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* of opening/closing comment figures.
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*
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* Although it may initially appear redundant, we use the first method
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* to give more specific feedback to the user.
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*/
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$unclosed_comment_count = $this->validate_count_unclosed_comments( $css );
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if ( 0 < $unclosed_comment_count ) {
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$validity->add( 'unclosed_comment', sprintf( _n( 'There is %s unclosed code comment. Close each comment with <code>*/</code>.', 'There are %s unclosed code comments. Close each comment with <code>*/</code>.', $unclosed_comment_count ), $unclosed_comment_count ) );
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$imbalanced = true;
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} elseif ( ! $this->validate_balanced_characters( '/*', '*/', $css ) ) {
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$validity->add( 'imbalanced_comments', __( 'There is an extra <code>*/</code>, indicating an end to a comment. Be sure that there is an opening <code>/*</code> for every closing <code>*/</code>.' ) );
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$imbalanced = true;
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}
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if ( $imbalanced && $this->is_possible_content_error( $css ) ) {
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$validity->add( 'possible_false_positive', __( 'Imbalanced/unclosed character errors can be caused by <code>content: "";</code> declarations. You may need to remove this or add it to a custom CSS file.' ) );
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}
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if ( empty( $validity->errors ) ) {
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$validity = parent::validate( $css );
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}
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return $validity;
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}
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/**
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* Store the CSS setting value in the custom_css custom post type for the stylesheet.
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*
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* @since 4.7.0
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* @access public
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*
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* @param string $css The input value.
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* @return int|false The post ID or false if the value could not be saved.
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*/
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public function update( $css ) {
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$args = array(
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'post_content' => $css ? $css : '',
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'post_title' => $this->stylesheet,
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'post_name' => sanitize_title( $this->stylesheet ),
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'post_type' => 'custom_css',
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'post_status' => 'publish',
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);
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// Update post if it already exists, otherwise create a new one.
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$post_id = null;
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$query = new WP_Query( array(
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'post_type' => 'custom_css',
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'post_status' => get_post_stati(),
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'name' => sanitize_title( $this->stylesheet ),
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'number' => 1,
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'no_found_rows' => true,
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'cache_results' => true,
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'update_post_meta_cache' => false,
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'update_term_meta_cache' => false,
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'suppress_filters' => true,
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) );
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if ( ! empty( $query->post ) ) {
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$args['ID'] = $query->post->ID;
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$post_id = wp_update_post( wp_slash( $args ) );
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} else {
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$post_id = wp_insert_post( wp_slash( $args ) );
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}
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if ( ! $post_id ) {
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return false;
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}
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// Cache post ID in theme mod for performance to avoid additional DB query.
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if ( $this->manager->get_stylesheet() === $this->stylesheet ) {
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set_theme_mod( 'custom_css_post_id', $post_id );
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}
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return $post_id;
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}
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/**
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* Ensure there are a balanced number of paired characters.
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*
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* This is used to check that the number of opening and closing
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* characters is equal.
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*
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* For instance, there should be an equal number of braces ("{", "}")
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* in the CSS.
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*
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* @since 4.7.0
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* @access private
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*
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* @param string $opening_char The opening character.
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* @param string $closing_char The closing character.
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* @param string $css The CSS input string.
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*
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* @return bool
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*/
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private function validate_balanced_characters( $opening_char, $closing_char, $css ) {
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return substr_count( $css, $opening_char ) === substr_count( $css, $closing_char );
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}
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/**
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* Ensure there are an even number of paired characters.
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*
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* This is used to check that the number of a specific
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* character is even.
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*
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* For instance, there should be an even number of double quotes
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* in the CSS.
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*
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* @since 4.7.0
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* @access private
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*
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* @param string $char A character.
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* @param string $css The CSS input string.
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* @return bool Equality.
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*/
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private function validate_equal_characters( $char, $css ) {
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$char_count = substr_count( $css, $char );
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return ( 0 === $char_count % 2 );
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}
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/**
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* Count unclosed CSS Comments.
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*
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* Used during validation.
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*
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* @see self::validate()
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*
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* @since 4.7.0
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* @access private
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*
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* @param string $css The CSS input string.
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* @return int Count.
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*/
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private function validate_count_unclosed_comments( $css ) {
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$count = 0;
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$comments = explode( '/*', $css );
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if ( ! is_array( $comments ) || ( 1 >= count( $comments ) ) ) {
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return $count;
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}
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unset( $comments[0] ); // The first item is before the first comment.
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foreach ( $comments as $comment ) {
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if ( false === strpos( $comment, '*/' ) ) {
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$count++;
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}
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}
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return $count;
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}
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/**
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* Find "content:" within a string.
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*
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* Imbalanced/Unclosed validation errors may be caused
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* when a character is used in a "content:" declaration.
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*
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* This function is used to detect if this is a possible
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* cause of the validation error, so that if it is,
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* a notification may be added to the Validation Errors.
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*
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* Example:
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* .element::before {
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* content: "(\"";
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* }
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* .element::after {
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* content: "\")";
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* }
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*
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* Using ! empty() because strpos() may return non-boolean values
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* that evaluate to false. This would be problematic when
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* using a strict "false === strpos()" comparison.
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*
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* @since 4.7.0
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* @access private
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*
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* @param string $css The CSS input string.
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* @return bool
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*/
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private function is_possible_content_error( $css ) {
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$found = preg_match( '/\bcontent\s*:/', $css );
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if ( ! empty( $found ) ) {
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return true;
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}
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return false;
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}
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}
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