gutenberg / lib / compat / wordpress-7.1 / kses.php

kses.php in Gutenberg 23.6.2, at lib/compat/wordpress-7.1/kses.php

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1	<?php
2	/**
3	* Compatibility shims for KSES (content filtering) for WordPress 7.1.
4	*
5	* @package gutenberg
6	*/
7
8	/**
9	* Adds SVG presentation attributes to the list of safe CSS properties.
10	*
11	* The {@see safecss_filter_attr()} function only keeps allowlisted CSS properties, so SVG
12	* presentation attributes such as `fill` are stripped by default. This allows
13	* the SVG-specific ones.
14	*
15	* @param string[] $attr Array of allowed CSS attributes.
16	* @return string[] Modified array of allowed CSS attributes.
17	*/
18	function gutenberg_add_svg_to_safe_style_css( array $attr ): array {
19	$svg_properties = array(
20	// Fill.
21	'fill',
22	'fill-opacity',
23	'fill-rule',
24
25	// Stroke.
26	'stroke',
27	'stroke-dasharray',
28	'stroke-dashoffset',
29	'stroke-linecap',
30	'stroke-linejoin',
31	'stroke-miterlimit',
32	'stroke-opacity',
33	'stroke-width',
34
35	// Paint.
36	'color-interpolation',
37	'color-interpolation-filters',
38	'paint-order',
39	'stop-color',
40	'stop-opacity',
41	'flood-color',
42	'flood-opacity',
43	'lighting-color',
44
45	// Markers.
46	'marker',
47	'marker-end',
48	'marker-mid',
49	'marker-start',
50
51	// Clipping and masking.
52	'clip-path',
53	'clip-rule',
54	'mask',
55	'mask-type',
56
57	// Geometry.
58	'cx',
59	'cy',
60	'r',
61	'rx',
62	'ry',
63	'x',
64	'y',
65	'd',
66
67	// Text.
68	'alignment-baseline',
69	'baseline-shift',
70	'dominant-baseline',
71	'glyph-orientation-horizontal',
72	'glyph-orientation-vertical',
73	'text-anchor',
74	'unicode-bidi',
75	'word-spacing',
76
77	// Font.
78	'font-size-adjust',
79	'font-stretch',
80
81	// Rendering.
82	'color-rendering',
83	'image-rendering',
84	'shape-rendering',
85	'text-rendering',
86	'vector-effect',
87
88	// Transforms.
89	'transform',
90	'transform-origin',
91
92	// Interactivity and visibility.
93	'pointer-events',
94	'visibility',
95	);
96
97	return array_unique( array_merge( $attr, $svg_properties ) );
98	}
99	add_filter( 'safe_style_css', 'gutenberg_add_svg_to_safe_style_css' );
100
101	/**
102	* Allow gradient background-image values, including gradients combined with a
103	* url() image, in inline styles.
104	*
105	* Without this, {@see safecss_filter_attr()} strips gradients that use functions
106	* beyond rgb()/rgba(), or that are combined with a url() image. This removes each
107	* gradient from the test string and re-checks the remainder, so those values
108	* survive sanitization.
109	*
110	* @param bool $allow_css Whether the CSS is allowed.
111	* @param string $css_test_string The CSS declaration to test.
112	* @return bool Whether the CSS is allowed.
113	*/
114	function gutenberg_allow_extended_gradient_backgrounds( $allow_css, $css_test_string ) {
115	if ( $allow_css ) {
116	return $allow_css;
117	}
118
119	if ( ! preg_match( '/^background-image\s*:/', $css_test_string ) ) {
120	return $allow_css;
121	}
122
123	/*
124	* Remove each gradient (allowing one level of nested functions such as
125	* rgb(), hsl(), or calc()) and re-test. Any url() has already been removed
126	* and protocol-checked by safecss_filter_attr() before this filter runs.
127	*/
128	$stripped = preg_replace( '/(?:repeating-)?(?:linear\|radial\|conic)-gradient$(?:[^()]\|\([^()]$)\)/', '', $css_test_string );
129
130	if ( ! preg_match( '%[\\\(&=}]\|/\*%', $stripped ) ) {
131	return true;
132	}
133
134	return $allow_css;
135	}
136
137	add_filter( 'safecss_filter_attr_allow_css', 'gutenberg_allow_extended_gradient_backgrounds', 10, 2 );
138
139	/**
140	* Allows the `tabindex` attribute on elements that support global attributes.
141	*
142	* `tabindex` is a global HTML attribute, but KSES strips it from post content.
143	* The Tab Panel block saves it to keep the panel focusable.
144	*
145	* @param array[] $tags Array of allowed HTML tags and their allowed attributes.
146	* @return array[] Modified array of allowed HTML tags.
147	*/
148	function gutenberg_add_tabindex_to_kses_allowed_html( $tags ) {
149	if ( ! is_array( $tags ) ) {
150	return $tags;
151	}
152
153	foreach ( $tags as $tag => $attributes ) {
154	if ( is_array( $attributes ) ) {
155	$tags[ $tag ]['tabindex'] = true;
156	}
157	}
158
159	return $tags;
160	}
161	add_filter( 'wp_kses_allowed_html', 'gutenberg_add_tabindex_to_kses_allowed_html' );
162