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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
* @var string
*/
public $type = 'custom_css';
/**
* Setting Transport
*
* @since 4.7.0
* @var string
*/
public $transport = 'postMessage';
/**
* Capability required to edit this setting.
*
* @since 4.7.0
* @var string
*/
public $capability = 'edit_css';
/**
* Stylesheet
*
* @since 4.7.0
* @var string
*/
public $stylesheet = '';
/**
* WP_Customize_Custom_CSS_Setting constructor.
*
* @since 4.7.0
*
* @throws Exception If the setting ID does not match the pattern `custom_css[$stylesheet]`.
*
* @param WP_Customize_Manager $manager Customizer bootstrap instance.
* @param string $id A 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
*
* @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;
}
/**
* Filters `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
*
* @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
*
* @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 $value;
}
/**
* Validate a received value for being valid CSS.
*
* Checks for imbalanced braces, brackets, and comments.
* Notifications are rendered when the customizer state is saved.
*
* @since 4.7.0
* @since 4.9.0 Checking for balanced characters has been moved client-side via linting in code editor.
* @since 5.9.0 Renamed `$css` to `$value` for PHP 8 named parameter support.
* @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_REST_Global_Styles_Controller::validate_custom_css()
*
* @param string $value CSS to validate.
* @return true|WP_Error True if the input was validated, otherwise WP_Error.
*/
public function validate( $value ) {
// Restores the more descriptive, specific name for use within this method.
$css = $value;
$validity = new WP_Error();
$length = strlen( $css );
for (
$at = strcspn( $css, '<' );
$at < $length;
$at += strcspn( $css, '<', ++$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., `<`,
* `</`, … `</style`) because subsequent styles which are concatenated
* could complete it, forming a valid `</style>` tag.
*
* Example:
*
* $style_a = 'p { font-weight: bold; </sty';
* $style_b = 'le> gotcha!';
* $combined = "{$style_a}{$style_b}";
*
* $style_a = 'p { font-weight: bold; </style';
* $style_b = 'p > b { color: red; }';
* $combined = "{$style_a}\n{$style_b}";
*
* 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.
*
* @see https://html.spec.whatwg.org/multipage/parsing.html#rawtext-end-tag-name-state
*/
$possible_style_close_tag = 0 === substr_compare(
$css,
'</style',
$at,
min( 7, $remaining_strlen ),
true
);
if ( $possible_style_close_tag ) {
if ( $remaining_strlen < 8 ) {
$validity->add(
'illegal_markup',
sprintf(
/* translators: %s is the CSS that was provided. */
__( 'The CSS must not end in "%s".' ),
esc_html( substr( $css, $at ) )
)
);
break;
}
if ( 1 === strspn( $css, " \t\f\r\n/>", $at + 7, 1 ) ) {
$validity->add(
'illegal_markup',
sprintf(
/* translators: %s is the CSS that was provided. */
__( 'The CSS must not contain "%s".' ),
esc_html( substr( $css, $at, 8 ) )
)
);
break;
}
}
}
if ( ! $validity->has_errors() ) {
$validity = parent::validate( $css );
}
return $validity;
}
/**
* Store the CSS setting value in the custom_css custom post type for the stylesheet.
*
* @since 4.7.0
* @since 5.9.0 Renamed `$css` to `$value` for PHP 8 named parameter support.
*
* @param string $value CSS to update.
* @return int|false The post ID or false if the value could not be saved.
*/
public function update( $value ) {
// Restores the more descriptive, specific name for use within this method.
$css = $value;
if ( empty( $css ) ) {
$css = '';
}
$r = wp_update_custom_css_post(
$css,
array(
'stylesheet' => $this->stylesheet,
)
);
if ( is_wp_error( $r ) ) {
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;
}
}