Add google font providers, subscribers

inc/Engine/Media/Fonts/Controller/Fonts.php

@@ -0,0 +1,57 @@
+<?php
+declare(strict_types=1);
+
+namespace WP_Rocket\Engine\Media\Fonts\Controller;
+
+use WP_Rocket\Engine\Media\Fonts\Provider\Provider;
+use WP_Rocket\Engine\Optimization\RegexTrait;
+
+class Fonts {
+	use RegexTrait;
+
+	/**
+	 * Filesystem instance.
+	 *
+	 * @var Filesystem
+	 */
+	private $filesystem;
+
+	/**
+	 * Provider instance.
+	 *
+	 * @var Provider
+	 */
+	private $provider;
+
+    /**
+     * @param Provider $provider Provider Instance.
+     * @param Filesystem $filesystem Filesystem Instance.
+    */
+	public function __construct(
+		Provider $provider,
+		Filesystem $filesystem
+	) {
+		$this->filesystem = $filesystem;
+		$this->provider   = $provider;
+	}
+
+	/**
+	 * Process
+	 */
+	public function process( $html ): string {
+		global $wp;
+		$clean_html = $this->hide_comments( $html );
+		$font_links = $this->provider->process( $clean_html );
+
+		if ( empty( $font_links ) ) {
+			return $html;
+		}
+		$url = untrailingslashit( home_url( add_query_arg( [], $wp->request ) ) );
+
+		foreach ( $font_links as $link ) {
+			$this->filesystem->write_font_css( $url, $link );
+		}
+
+		return $html;
+	}
+}

inc/Engine/Media/Fonts/Frontend/Subscriber.php

@@ -0,0 +1,35 @@
+<?php
+declare(strict_types=1);
+
+namespace WP_Rocket\Engine\Media\Fonts\Frontend;
+
+use WP_Rocket\Engine\Media\Fonts\Controller\Fonts;
+use WP_Rocket\Event_Management\Subscriber_Interface;
+
+class Subscriber implements Subscriber_Interface {
+	/**
+	 * Fonts instance
+	 *
+	 * @var Fonts
+	 */
+	private $fonts;
+
+	/**
+	 * Instantiate the class
+	 *
+	 * @param Fonts $fonts Fonts instance.
+	 */
+	public function __construct( Fonts $fonts ) {
+		$this->fonts = $fonts;
+	}
+
+	public static function get_subscribed_events() {
+		return [
+			'rocket_buffer' => [ 'process', 15 ],
+		];
+	}
+
+	public function process( $html ): string {
+		return $this->fonts->process( $html );
+	}
+}

inc/Engine/Media/Fonts/Provider/GoogleFont/CSS2Handler.php

@@ -0,0 +1,28 @@
+<?php
+declare(strict_types=1);
+
+namespace WP_Rocket\Engine\Media\Fonts\Provider\GoogleFont;
+
+use WP_Rocket\Engine\Optimization\RegexTrait;
+
+class CSS2Handler {
+	use RegexTrait;
+
+	public function get_font_from_html( $html ): array {
+		$font_urls  = [];
+		$clean_html = $this->hide_comments( $html );
+		$fonts      = $this->find( '<link(?:\s+(?:(?!href\s*=\s*)[^>])+)?(?:\s+href\s*=\s*([\'"])(?<url>(?:https?:)?\/\/fonts\.googleapis\.com\/css2(?:(?!\1).)+)\1)(?:\s+[^>]*)?>', $clean_html );
+
+		if ( empty( $fonts ) ) {
+			return [];
+		}
+
+		foreach ( $fonts as $font ) {
+			if ( isset( $font['url'] ) ) {
+				$font_urls[] = $font['url'];
+			}
+		}
+
+		return $font_urls;
+	}
+}

inc/Engine/Media/Fonts/Provider/GoogleFont/CSSHandler.php

@@ -0,0 +1,28 @@
+<?php
+declare(strict_types=1);
+
+namespace WP_Rocket\Engine\Media\Fonts\Provider\GoogleFont;
+
+use WP_Rocket\Engine\Optimization\RegexTrait;
+
+class CSSHandler {
+	use RegexTrait;
+
+	public function get_font_from_html( $html ): array {
+		$font_urls  = [];
+		$clean_html = $this->hide_comments( $html );
+		$fonts      = $this->find( '<link(?:\s+(?:(?!href\s*=\s*)[^>])+)?(?:\s+href\s*=\s*([\'"])(?<url>(?:https?:)?\/\/fonts\.googleapis\.com\/css[^\d](?:(?!\1).)+)\1)(?:\s+[^>]*)?>', $clean_html );
+
+		if ( empty( $fonts ) ) {
+			return [];
+		}
+
+		foreach ( $fonts as $font ) {
+			if ( isset( $font['url'] ) ) {
+				$font_urls[] = $font['url'];
+			}
+		}
+
+		return $font_urls;
+	}
+}

inc/Engine/Media/Fonts/Provider/Provider.php

@@ -0,0 +1,67 @@
+<?php
+declare(strict_types=1);
+
+namespace WP_Rocket\Engine\Media\Fonts\Provider;
+
+use WP_Rocket\Engine\Media\Fonts\Provider\GoogleFont\CSS2Handler;
+use WP_Rocket\Engine\Media\Fonts\Provider\GoogleFont\CSSHandler;
+
+class Provider {
+	/**
+	 * Array of providers
+	 *
+	 * @var array
+	 */
+	private $providers;
+
+	private $css_handler;
+
+	private $css2_handler;
+
+	private $provider_methods = [
+		'google_font'  => 'google_font_provider',
+		'font_awesome' => 'font_awesome_provider',
+	];
+
+	public function __construct(
+		array $providers,
+		CSSHandler $css_handler,
+		CSS2Handler $css2_handler
+	) {
+		$this->css2_handler = $css2_handler;
+		$this->css_handler  = $css_handler;
+		$this->providers    = $providers;
+	}
+
+    /**
+     * Process font link
+     * @param string $html
+     *
+     * @return array
+    */
+	public function process( string $html ): array {
+		$fonts = [];
+		foreach ( $this->providers as $provider ) {
+			if ( isset( $this->provider_methods[ $provider ] ) ) {
+				$font_provider = $this->provider_methods[ $provider ];
+				$fonts[]       = $this->$font_provider( $html );
+			}
+		}
+
+		return array_merge( ...$fonts );
+	}
+
+    /**
+     * Google font provider
+     *
+     * @param string $html
+     *
+     * @return array
+    */
+	private function google_font_provider( string $html ): array {
+		return array_merge(
+			$this->css_handler->get_font_from_html( $html ),
+			$this->css2_handler->get_font_from_html( $html )
+		);
+	}
+}

inc/Engine/Media/Fonts/ServiceProvider.php

@@ -5,6 +5,11 @@
 namespace WP_Rocket\Engine\Media\Fonts;
 
 use WP_Rocket\Dependencies\League\Container\ServiceProvider\AbstractServiceProvider;
+use WP_Rocket\Engine\Media\Fonts\Frontend\Subscriber as FrontendSubscriber;
+use WP_Rocket\Engine\Media\Fonts\Provider\GoogleFont\CSS2Handler;
+use WP_Rocket\Engine\Media\Fonts\Provider\GoogleFont\CSSHandler;
+use WP_Rocket\Engine\Media\Fonts\Provider\Provider as HostFontProvider;
+use WP_Rocket\Engine\Media\Fonts\Controller\Fonts as FontsController;
 use WP_Rocket\Engine\Media\Fonts\Controller\Filesystem;
 
 /**
@@ -16,7 +21,11 @@ class ServiceProvider extends AbstractServiceProvider {
 	 *
 	 * @var array
 	 */
-	protected $provides = [];
+	protected $provides = [
+		'fonts_frontend_subscriber',
+		'fonts_filesystem',
+		'host_font_provider',
+	];
 
 	/**
 	 * Check if the service provider provides a specific service.
@@ -35,8 +44,32 @@ public function provides( string $id ): bool {
 	 * @return void
 	 */
 	public function register(): void {
+
+		$provider_array = [
+			'google_font',
+		];
+
+		$this->getContainer()->add( 'css2_handler', CSS2Handler::class );
+		$this->getContainer()->add( 'css_handler', CSSHandler::class );
+
 		$this->getContainer()->add( 'fonts_filesystem', Filesystem::class )
 			->addArgument( rocket_get_constant( 'WP_ROCKET_FONT_CSS_PATH' ) )
 			->addArgument( rocket_direct_filesystem() );
+
+		$this->getContainer()->add( 'host_font_provider', HostFontProvider::class )
+			->addArguments(
+				[
+					$provider_array,
+					'css_handler',
+					'css2_handler',
+				]
+			);
+
+		$this->getContainer()->add( 'fonts_controller', FontsController::class )
+			->addArgument( $this->getContainer()->get( 'host_font_provider' ) )
+			->addArgument( $this->getContainer()->get( 'fonts_filesystem' ) );
+
+		$this->getContainer()->addShared( 'fonts_frontend_subscriber', FrontendSubscriber::class )
+			->addArgument( $this->getContainer()->get( 'fonts_controller' ) );
 	}
 }

inc/Plugin.php

@@ -403,6 +403,7 @@ private function init_common_subscribers() {
 			'performance_hints_admin_subscriber',
 			'lrc_frontend_subscriber',
 			'taxonomy_subscriber',
+			'fonts_frontend_subscriber',
 		];
 
 		$host_type = HostResolver::get_host_service();