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wp-content/plugins/jetpack-boost/app/lib/critical-css/class-critical-css-invalidator.php

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+<?php
+/**
+ * Critical CSS Invalidator
+ *
+ * Reset critical CSS when existing critical css values are stale.
+ */
+
+namespace Automattic\Jetpack_Boost\Lib\Critical_CSS;
+
+use Automattic\Jetpack_Boost\Admin\Regenerate_Admin_Notice;
+use Automattic\Jetpack_Boost\Lib\Boost_Health;
+use Automattic\Jetpack_Boost\Lib\Critical_CSS\Source_Providers\Source_Providers;
+use Automattic\Jetpack_Boost\Modules\Modules_Setup;
+use Automattic\Jetpack_Boost\Modules\Optimizations\Cloud_CSS\Cloud_CSS;
+use Automattic\Jetpack_Boost\Modules\Optimizations\Cloud_CSS\Cloud_CSS_Followup;
+
+/**
+ * Handler for invalidating Critical CSS; both Cloud and Local. Watches relevant
+ * hooks and clears data when necessary. Also sends out its own action
+ * (after_critical_css_invalidate) so that the Cloud or Local implementations of
+ * Critical CSS can respond to the invalidation.
+ */
+class Critical_CSS_Invalidator {
+	public static function init() {
+		add_action( 'jetpack_boost_deactivate', array( __CLASS__, 'reset_data' ) );
+		add_action( 'jetpack_boost_environment_changed', array( __CLASS__, 'handle_environment_change' ) );
+		add_filter( 'jetpack_boost_total_problem_count', array( __CLASS__, 'update_boost_problem_count' ) );
+	}
+
+	/**
+	 * Reset Critical CSS data.
+	 * For Cloud CSS, we need to make sure there are providers in the state,
+	 * otherwise Cloud CSS cannot be stored after it is generated by the cloud.
+	 */
+	public static function reset_data() {
+		$storage = new Critical_CSS_Storage();
+		$storage->clear();
+
+		$state = new Critical_CSS_State();
+		$state->clear();
+
+		if ( self::is_cloud_css() ) {
+			$state->prepare_for_generation( ( new Source_Providers() )->get_provider_sources() );
+			$state->save();
+
+			// Clear the regenerate flag so things are nice and tidy.
+			jetpack_boost_ds_delete( 'critical_css_suggest_regenerate' );
+			// Also clear the admin notice flag, so the notice doesn't show up in case
+			// the user is reverted to free Boost.
+			Regenerate_Admin_Notice::dismiss();
+
+		}
+
+		Cloud_CSS_Followup::unschedule();
+	}
+
+	/**
+	 * Respond to environment changes; deciding whether or not to clear Critical CSS data.
+	 */
+	public static function handle_environment_change( $is_major_change ) {
+		if ( $is_major_change ) {
+			self::reset_data();
+
+			/**
+			 * Indicate that all existing critical CSS has been invalidated.
+			 */
+			do_action( 'jetpack_boost_critical_css_invalidated' );
+		}
+	}
+
+	public static function update_boost_problem_count( $count ) {
+		$css_needs_regeneration = Boost_Health::critical_css_needs_regeneration();
+		if ( $css_needs_regeneration ) {
+			++$count;
+		}
+
+		return $count;
+	}
+
+	public static function is_cloud_css() {
+		$optimizations = ( new Modules_Setup() )->get_status();
+		return isset( $optimizations[ Cloud_CSS::get_slug() ] ) && $optimizations[ Cloud_CSS::get_slug() ];
+	}
+}