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

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+<?php
+
+namespace Automattic\Jetpack_Boost\Lib\Critical_CSS;
+
+use Automattic\Jetpack_Boost\Admin\Regenerate_Admin_Notice;
+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;
+
+class Regenerate {
+	/** @var Critical_CSS_State */
+	private $state;
+
+	public function is_cloud_css() {
+		$optimizations = ( new Modules_Setup() )->get_status();
+		return isset( $optimizations[ Cloud_CSS::get_slug() ] ) && $optimizations[ Cloud_CSS::get_slug() ];
+	}
+
+	public function start() {
+		// Get Critical CSS Source URLs
+		$source_providers = new Source_Providers();
+		$providers        = $source_providers->get_provider_sources();
+
+		// Store those URLs in the Critical CSS State
+		$this->state = new Critical_CSS_State();
+		$this->state->prepare_request()
+				->set_pending_providers( $providers )
+				->save();
+
+		// Get the data
+		$data = $this->state->get();
+
+		if ( $this->is_cloud_css() ) {
+			// If this is a cloud CSS request, we need to trigger the generation
+			// of the CSS and return the URL to the CSS file.
+			$cloud_css = new Cloud_CSS();
+			$cloud_css->regenerate_cloud_css( Cloud_CSS::REGENERATE_REASON_USER_REQUEST, $cloud_css->get_all_providers() );
+			Cloud_CSS_Followup::schedule();
+		}
+
+		// Clear previous Critical CSS From storage
+		$storage = new Critical_CSS_Storage();
+		$storage->clear();
+
+		// Dismiss admin notices
+		Regenerate_Admin_Notice::dismiss();
+		jetpack_boost_ds_delete( 'critical_css_suggest_regenerate' );
+
+		return $data;
+	}
+
+	public function get_state() {
+		return $this->state;
+	}
+}