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<?php
if (!defined('ABSPATH')) die('No direct access allowed');
class WP_Optimize_Minify_Fonts {
/**
* Get a list of Google fonts
*
* @return Array
*/
public static function get_google_fonts() {
// https://www.googleapis.com/webfonts/v1/webfonts?sort=alpha
$google_fonts_file = WPO_PLUGIN_MAIN_PATH.'google-fonts.json';
if (is_file($google_fonts_file) && is_readable($google_fonts_file)) {
return json_decode(file_get_contents($google_fonts_file), true);
}
return array();
}
/**
* Check if the google font exist or not
*
* @param string $font
* @return boolean
*/
public static function concatenate_google_fonts_allowed($font) {
$gfonts_whitelist = self::get_google_fonts();
// normalize
$font = str_ireplace('+', ' ', strtolower($font));
return in_array($font, $gfonts_whitelist);
}
/**
* Concatenate Google Fonts tags (http://fonts.googleapis.com/css?...)
*
* @param array $gfonts_array
* @return string|boolean
*/
public static function concatenate_google_fonts($gfonts_array) {
// process names, weights, subsets
$fonts = array();
$subsets = array();
// extract font families
foreach ($gfonts_array as $font) {
// Parse the font URL: Puts the query parameters in an array.
parse_str(parse_url($font, PHP_URL_QUERY), $font_elements);
// Process each font family
foreach (explode('|', $font_elements['family']) as $font_family) {
// Separate font and sizes
$font_family = explode(':', $font_family);
// if the family wasn't added yet
if (!in_array($font_family[0], array_keys($fonts))) {
$fonts[$font_family[0]] = isset($font_family[1]) ? explode(',', $font_family[1]) : array();
} else {
// if the family was already added, and this new one has weights, merge with previous
if (isset($font_family[1])) {
$fonts[$font_family[0]] = array_merge($fonts[$font_family[0]], explode(',', $font_family[1]));
}
}
}
// Add subsets
if (isset($font_elements['subset'])) {
$subsets = array_merge($subsets, explode(',', $font_elements['subset']));
}
}
// build font names with font weights, if allowed
$build = array();
foreach ($fonts as $font_name => $font_weights) {
if (self::concatenate_google_fonts_allowed($font_name)) {
$f = $font_name;
if (count($font_weights) > 0) {
$f.= ':'. implode(',', array_unique($font_weights));
}
$build[] = $f;
}
}
// merge, append subsets
$merge = '';
if (count($build) > 0) {
$merge = str_replace(' ', '+', implode('|', $build));
// Maybe add subsets
if (count($subsets) > 0) {
$merge.= '&subset='.implode(',', array_unique($subsets));
}
$config = wp_optimize_minify_config();
/**
* Filters wether to add display=swap to Google fonts urls
*
* @param boolean $display - Default to true
*/
if (apply_filters('wpo_minify_gfont_display_swap', $config->get('enable_display_swap'))) {
/**
* Filters the value of the display parameter.
*
* @param string $display_value - Default to 'swap'. https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-display
*/
$merge.= '&display='.apply_filters('wpo_minify_gfont_display_type', 'swap');
}
}
if (!empty($merge)) return 'https://fonts.googleapis.com/css?family='.$merge;
return false;
}
}
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