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<?php
/**
* Customize API: WP_Customize_Custom_CSS_Setting class
*
* This handles validation, sanitization and saving of the value.
*
* @package WordPress
* @subpackage Customize
* @since 4.7.0
*/
/**
* Custom Setting to handle WP Custom CSS.
*
* @since 4.7.0
*
* @see WP_Customize_Setting
*/
final class WP_Customize_Custom_CSS_Setting extends WP_Customize_Setting {
/**
* The setting type.
*
* @since 4.7.0
* @access public
* @var string
*/
public $type = 'custom_css';
/**
* Setting Transport
*
* @since 4.7.0
* @access public
* @var string
*/
public $transport = 'postMessage';
/**
* Capability required to edit this setting.
*
* @since 4.7.0
* @access public
* @var string
*/
public $capability = 'edit_css';
/**
* Stylesheet
*
* @since 4.7.0
* @access public
* @var string
*/
public $stylesheet = '';
/**
* WP_Customize_Custom_CSS_Setting constructor.
*
* @since 4.7.0
* @access public
*
* @throws Exception If the setting ID does not match the pattern `custom_css[$stylesheet]`.
*
* @param WP_Customize_Manager $manager The Customize Manager class.
* @param string $id An specific ID of the setting. Can be a
* theme mod or option name.
* @param array $args Setting arguments.
*/
public function __construct( $manager, $id, $args = array() ) {
parent::__construct( $manager, $id, $args );
if ( 'custom_css' !== $this->id_data['base'] ) {
throw new Exception( 'Expected custom_css id_base.' );
}
if ( 1 !== count( $this->id_data['keys'] ) || empty( $this->id_data['keys'][0] ) ) {
throw new Exception( 'Expected single stylesheet key.' );
}
$this->stylesheet = $this->id_data['keys'][0];
}
/**
* Add filter to preview post value.
*
* @since 4.7.9
* @access public
*
* @return bool False when preview short-circuits due no change needing to be previewed.
*/
public function preview() {
if ( $this->is_previewed ) {
return false;
}
$this->is_previewed = true;
add_filter( 'wp_get_custom_css', array( $this, 'filter_previewed_wp_get_custom_css' ), 9, 2 );
return true;
}
/**
* Filter `wp_get_custom_css` for applying the customized value.
*
* This is used in the preview when `wp_get_custom_css()` is called for rendering the styles.
*
* @since 4.7.0
* @access private
* @see wp_get_custom_css()
*
* @param string $css Original CSS.
* @param string $stylesheet Current stylesheet.
* @return string CSS.
*/
public function filter_previewed_wp_get_custom_css( $css, $stylesheet ) {
if ( $stylesheet === $this->stylesheet ) {
$customized_value = $this->post_value( null );
if ( ! is_null( $customized_value ) ) {
$css = $customized_value;
}
}
return $css;
}
/**
* Fetch the value of the setting. Will return the previewed value when `preview()` is called.
*
* @since 4.7.0
* @access public
* @see WP_Customize_Setting::value()
*
* @return string
*/
public function value() {
if ( $this->is_previewed ) {
$post_value = $this->post_value( null );
if ( null !== $post_value ) {
return $post_value;
}
}
$id_base = $this->id_data['base'];
$value = '';
$post = wp_get_custom_css_post( $this->stylesheet );
if ( $post ) {
$value = $post->post_content;
}
if ( empty( $value ) ) {
$value = $this->default;
}
/** This filter is documented in wp-includes/class-wp-customize-setting.php */
$value = apply_filters( "customize_value_{$id_base}", $value, $this );
return $value;
}
/**
* Validate CSS.
*
* Checks for imbalanced braces, brackets, and comments.
* Notifications are rendered when the customizer state is saved.
*
* @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.
*
* @since 4.7.0
* @access public
*
* @param string $css The input string.
* @return true|WP_Error True if the input was validated, otherwise WP_Error.
*/
public function validate( $css ) {
$validity = new WP_Error();
if ( preg_match( '#</?\w+#', $css ) ) {
$validity->add( 'illegal_markup', __( 'Markup is not allowed in CSS.' ) );
}
$imbalanced = false;
// Make sure that there is a closing brace for each opening brace.
if ( ! $this->validate_balanced_characters( '{', '}', $css ) ) {
$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>.' ) );
$imbalanced = true;
}
// Ensure brackets are balanced.
if ( ! $this->validate_balanced_characters( '[', ']', $css ) ) {
$validity->add( 'imbalanced_braces', __( 'Your brackets <code>[]</code> are imbalanced. Make sure there is a closing <code>]</code> for every opening <code>[</code>.' ) );
$imbalanced = true;
}
// Ensure parentheses are balanced.
if ( ! $this->validate_balanced_characters( '(', ')', $css ) ) {
$validity->add( 'imbalanced_parentheses', __( 'Your parentheses <code>()</code> are imbalanced. Make sure there is a closing <code>)</code> for every opening <code>(</code>.' ) );
$imbalanced = true;
}
// Ensure double quotes are equal.
if ( ! $this->validate_equal_characters( '"', $css ) ) {
$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>.' ) );
$imbalanced = true;
}
/*
* Make sure any code comments are closed properly.
*
* The first check could miss stray an unpaired comment closing figure, so if
* The number appears to be balanced, then check for equal numbers
* of opening/closing comment figures.
*
* Although it may initially appear redundant, we use the first method
* to give more specific feedback to the user.
*/
$unclosed_comment_count = $this->validate_count_unclosed_comments( $css );
if ( 0 < $unclosed_comment_count ) {
$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 ) );
$imbalanced = true;
} elseif ( ! $this->validate_balanced_characters( '/*', '*/', $css ) ) {
$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>.' ) );
$imbalanced = true;
}
if ( $imbalanced && $this->is_possible_content_error( $css ) ) {
$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.' ) );
}
if ( empty( $validity->errors ) ) {
$validity = parent::validate( $css );
}
return $validity;
}
/**
* Store the CSS setting value in the custom_css custom post type for the stylesheet.
*
* @since 4.7.0
* @access public
*
* @param string $css The input value.
* @return int|false The post ID or false if the value could not be saved.
*/
public function update( $css ) {
if ( empty( $css ) ) {
$css = '';
}
$r = wp_update_custom_css_post( $css, array(
'stylesheet' => $this->stylesheet,
) );
if ( $r instanceof WP_Error ) {
return false;
}
$post_id = $r->ID;
// Cache post ID in theme mod for performance to avoid additional DB query.
if ( $this->manager->get_stylesheet() === $this->stylesheet ) {
set_theme_mod( 'custom_css_post_id', $post_id );
}
return $post_id;
}
/**
* Ensure there are a balanced number of paired characters.
*
* This is used to check that the number of opening and closing
* characters is equal.
*
* For instance, there should be an equal number of braces ("{", "}")
* in the CSS.
*
* @since 4.7.0
* @access private
*
* @param string $opening_char The opening character.
* @param string $closing_char The closing character.
* @param string $css The CSS input string.
*
* @return bool
*/
private function validate_balanced_characters( $opening_char, $closing_char, $css ) {
return substr_count( $css, $opening_char ) === substr_count( $css, $closing_char );
}
/**
* Ensure there are an even number of paired characters.
*
* This is used to check that the number of a specific
* character is even.
*
* For instance, there should be an even number of double quotes
* in the CSS.
*
* @since 4.7.0
* @access private
*
* @param string $char A character.
* @param string $css The CSS input string.
* @return bool Equality.
*/
private function validate_equal_characters( $char, $css ) {
$char_count = substr_count( $css, $char );
return ( 0 === $char_count % 2 );
}
/**
* Count unclosed CSS Comments.
*
* Used during validation.
*
* @see self::validate()
*
* @since 4.7.0
* @access private
*
* @param string $css The CSS input string.
* @return int Count.
*/
private function validate_count_unclosed_comments( $css ) {
$count = 0;
$comments = explode( '/*', $css );
if ( ! is_array( $comments ) || ( 1 >= count( $comments ) ) ) {
return $count;
}
unset( $comments[0] ); // The first item is before the first comment.
foreach ( $comments as $comment ) {
if ( false === strpos( $comment, '*/' ) ) {
$count++;
}
}
return $count;
}
/**
* Find "content:" within a string.
*
* Imbalanced/Unclosed validation errors may be caused
* when a character is used in a "content:" declaration.
*
* This function is used to detect if this is a possible
* cause of the validation error, so that if it is,
* a notification may be added to the Validation Errors.
*
* Example:
* .element::before {
* content: "(\"";
* }
* .element::after {
* content: "\")";
* }
*
* Using ! empty() because strpos() may return non-boolean values
* that evaluate to false. This would be problematic when
* using a strict "false === strpos()" comparison.
*
* @since 4.7.0
* @access private
*
* @param string $css The CSS input string.
* @return bool
*/
private function is_possible_content_error( $css ) {
$found = preg_match( '/\bcontent\s*:/', $css );
if ( ! empty( $found ) ) {
return true;
}
return false;
}
}