260 lines
8.7 KiB
PHP
260 lines
8.7 KiB
PHP
<?php
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/**
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* Font Utils class.
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*
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* Provides utility functions for working with font families.
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*
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* @package WordPress
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* @subpackage Fonts
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* @since 6.5.0
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*/
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/**
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* A class of utilities for working with the Font Library.
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*
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* These utilities may change or be removed in the future and are intended for internal use only.
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*
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* @since 6.5.0
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* @access private
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*/
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class WP_Font_Utils {
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/**
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* Adds surrounding quotes to font family names that contain special characters.
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*
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* It follows the recommendations from the CSS Fonts Module Level 4.
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* @link https://www.w3.org/TR/css-fonts-4/#font-family-prop
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*
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* @since 6.5.0
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*
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* @param string $item A font family name.
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* @return string The font family name with surrounding quotes, if necessary.
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*/
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private static function maybe_add_quotes( $item ) {
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// Matches strings that are not exclusively alphabetic characters or hyphens, and do not exactly follow the pattern generic(alphabetic characters or hyphens).
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$regex = '/^(?!generic\([a-zA-Z\-]+\)$)(?!^[a-zA-Z\-]+$).+/';
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$item = trim( $item );
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if ( preg_match( $regex, $item ) ) {
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$item = trim( $item, "\"'" );
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return '"' . $item . '"';
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}
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return $item;
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}
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/**
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* Sanitizes and formats font family names.
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*
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* - Applies `sanitize_text_field`.
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* - Adds surrounding quotes to names containing any characters that are not alphabetic or dashes.
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*
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* It follows the recommendations from the CSS Fonts Module Level 4.
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* @link https://www.w3.org/TR/css-fonts-4/#font-family-prop
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*
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* @since 6.5.0
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* @access private
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*
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* @see sanitize_text_field()
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*
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* @param string $font_family Font family name(s), comma-separated.
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* @return string Sanitized and formatted font family name(s).
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*/
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public static function sanitize_font_family( $font_family ) {
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if ( ! $font_family ) {
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return '';
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}
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$output = sanitize_text_field( $font_family );
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$formatted_items = array();
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if ( str_contains( $output, ',' ) ) {
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$items = explode( ',', $output );
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foreach ( $items as $item ) {
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$formatted_item = self::maybe_add_quotes( $item );
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if ( ! empty( $formatted_item ) ) {
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$formatted_items[] = $formatted_item;
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}
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}
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return implode( ', ', $formatted_items );
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}
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return self::maybe_add_quotes( $output );
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}
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/**
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* Generates a slug from font face properties, e.g. `open sans;normal;400;100%;U+0-10FFFF`
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*
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* Used for comparison with other font faces in the same family, to prevent duplicates
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* that would both match according the CSS font matching spec. Uses only simple case-insensitive
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* matching for fontFamily and unicodeRange, so does not handle overlapping font-family lists or
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* unicode ranges.
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*
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* @since 6.5.0
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* @access private
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*
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* @link https://drafts.csswg.org/css-fonts/#font-style-matching
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*
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* @param array $settings {
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* Font face settings.
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*
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* @type string $fontFamily Font family name.
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* @type string $fontStyle Optional font style, defaults to 'normal'.
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* @type string $fontWeight Optional font weight, defaults to 400.
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* @type string $fontStretch Optional font stretch, defaults to '100%'.
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* @type string $unicodeRange Optional unicode range, defaults to 'U+0-10FFFF'.
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* }
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* @return string Font face slug.
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*/
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public static function get_font_face_slug( $settings ) {
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$defaults = array(
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'fontFamily' => '',
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'fontStyle' => 'normal',
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'fontWeight' => '400',
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'fontStretch' => '100%',
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'unicodeRange' => 'U+0-10FFFF',
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);
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$settings = wp_parse_args( $settings, $defaults );
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if ( function_exists( 'mb_strtolower' ) ) {
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$font_family = mb_strtolower( $settings['fontFamily'] );
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} else {
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$font_family = strtolower( $settings['fontFamily'] );
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}
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$font_style = strtolower( $settings['fontStyle'] );
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$font_weight = strtolower( $settings['fontWeight'] );
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$font_stretch = strtolower( $settings['fontStretch'] );
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$unicode_range = strtoupper( $settings['unicodeRange'] );
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// Convert weight keywords to numeric strings.
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$font_weight = str_replace( array( 'normal', 'bold' ), array( '400', '700' ), $font_weight );
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// Convert stretch keywords to numeric strings.
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$font_stretch_map = array(
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'ultra-condensed' => '50%',
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'extra-condensed' => '62.5%',
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'condensed' => '75%',
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'semi-condensed' => '87.5%',
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'normal' => '100%',
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'semi-expanded' => '112.5%',
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'expanded' => '125%',
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'extra-expanded' => '150%',
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'ultra-expanded' => '200%',
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);
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$font_stretch = str_replace( array_keys( $font_stretch_map ), array_values( $font_stretch_map ), $font_stretch );
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$slug_elements = array( $font_family, $font_style, $font_weight, $font_stretch, $unicode_range );
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$slug_elements = array_map(
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function ( $elem ) {
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// Remove quotes to normalize font-family names, and ';' to use as a separator.
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$elem = trim( str_replace( array( '"', "'", ';' ), '', $elem ) );
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// Normalize comma separated lists by removing whitespace in between items,
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// but keep whitespace within items (e.g. "Open Sans" and "OpenSans" are different fonts).
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// CSS spec for whitespace includes: U+000A LINE FEED, U+0009 CHARACTER TABULATION, or U+0020 SPACE,
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// which by default are all matched by \s in PHP.
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return preg_replace( '/,\s+/', ',', $elem );
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},
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$slug_elements
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);
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return sanitize_text_field( implode( ';', $slug_elements ) );
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}
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/**
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* Sanitizes a tree of data using a schema.
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*
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* The schema structure should mirror the data tree. Each value provided in the
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* schema should be a callable that will be applied to sanitize the corresponding
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* value in the data tree. Keys that are in the data tree, but not present in the
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* schema, will be removed in the sanitized data. Nested arrays are traversed recursively.
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*
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* @since 6.5.0
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*
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* @access private
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*
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* @param array $tree The data to sanitize.
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* @param array $schema The schema used for sanitization.
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* @return array The sanitized data.
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*/
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public static function sanitize_from_schema( $tree, $schema ) {
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if ( ! is_array( $tree ) || ! is_array( $schema ) ) {
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return array();
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}
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foreach ( $tree as $key => $value ) {
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// Remove keys not in the schema or with null/empty values.
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if ( ! array_key_exists( $key, $schema ) ) {
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unset( $tree[ $key ] );
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continue;
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}
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$is_value_array = is_array( $value );
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$is_schema_array = is_array( $schema[ $key ] ) && ! is_callable( $schema[ $key ] );
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if ( $is_value_array && $is_schema_array ) {
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if ( wp_is_numeric_array( $value ) ) {
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// If indexed, process each item in the array.
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foreach ( $value as $item_key => $item_value ) {
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$tree[ $key ][ $item_key ] = isset( $schema[ $key ][0] ) && is_array( $schema[ $key ][0] )
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? self::sanitize_from_schema( $item_value, $schema[ $key ][0] )
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: self::apply_sanitizer( $item_value, $schema[ $key ][0] );
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}
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} else {
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// If it is an associative or indexed array, process as a single object.
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$tree[ $key ] = self::sanitize_from_schema( $value, $schema[ $key ] );
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}
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} elseif ( ! $is_value_array && $is_schema_array ) {
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// If the value is not an array but the schema is, remove the key.
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unset( $tree[ $key ] );
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} elseif ( ! $is_schema_array ) {
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// If the schema is not an array, apply the sanitizer to the value.
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$tree[ $key ] = self::apply_sanitizer( $value, $schema[ $key ] );
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}
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// Remove keys with null/empty values.
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if ( empty( $tree[ $key ] ) ) {
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unset( $tree[ $key ] );
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}
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}
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return $tree;
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}
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/**
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* Applies a sanitizer function to a value.
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*
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* @since 6.5.0
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*
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* @param mixed $value The value to sanitize.
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* @param callable $sanitizer The sanitizer function to apply.
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* @return mixed The sanitized value.
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*/
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private static function apply_sanitizer( $value, $sanitizer ) {
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if ( null === $sanitizer ) {
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return $value;
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}
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return call_user_func( $sanitizer, $value );
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}
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/**
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* Returns the expected mime-type values for font files, depending on PHP version.
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*
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* This is needed because font mime types vary by PHP version, so checking the PHP version
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* is necessary until a list of valid mime-types for each file extension can be provided to
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* the 'upload_mimes' filter.
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*
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* @since 6.5.0
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*
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* @access private
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*
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* @return string[] A collection of mime types keyed by file extension.
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*/
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public static function get_allowed_font_mime_types() {
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$php_7_ttf_mime_type = PHP_VERSION_ID >= 70300 ? 'application/font-sfnt' : 'application/x-font-ttf';
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return array(
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'otf' => 'application/vnd.ms-opentype',
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'ttf' => PHP_VERSION_ID >= 70400 ? 'font/sfnt' : $php_7_ttf_mime_type,
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'woff' => PHP_VERSION_ID >= 80112 ? 'font/woff' : 'application/font-woff',
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'woff2' => PHP_VERSION_ID >= 80112 ? 'font/woff2' : 'application/font-woff2',
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);
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}
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}
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