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wp-content/plugins/jetpack-boost/compatibility/wp-super-cache-migration.php

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+<?php
+/**
+ * Automatically enable Page Cache when migrating from WP Super Cache.
+ *
+ * @package automattic/jetpack-boost
+ */
+
+namespace Automattic\Jetpack_Boost\Compatibility\Super_Cache;
+
+use Automattic\Jetpack_Boost\Lib\Analytics;
+use Automattic\Jetpack_Boost\Lib\Status;
+use Automattic\Jetpack_Boost\Modules\Optimizations\Page_Cache\Page_Cache;
+
+/**
+ * Accept migrations from WP Super Cache
+ */
+function migrate_from_super_cache() {
+
+	// Check if Jetpack Boost Page Cache module is enabled
+	if ( ! class_exists( Page_Cache::class ) ) {
+		return;
+	}
+
+	if ( ! Page_Cache::is_available() ) {
+		return;
+	}
+
+	// If Boost has already activated the Page Cache based on WPSC migration once, we don't want to do it again.
+	// For example - if the user manually de-activates Page Cache in Boost.
+	$migration_status = get_transient( 'jb_cache_moved_to_boost' );
+	// If the cache is already migrated, we don't need to do anything.
+	if ( get_transient( 'jb_boost_migration_complete' ) ) {
+		return;
+	}
+
+	// If Super Cache has set the transient, log it to tracks, but only once.
+	if ( $migration_status && ! get_transient( 'jb_boost_migration_tracked' ) ) {
+		set_transient( 'jb_boost_migration_tracked', true, 7 * DAY_IN_SECONDS );
+		Analytics::record_user_event( 'migrated_from_wpsc', array( 'source' => $migration_status ) );
+	}
+
+	// Only proceed to activate Page Cache in Jetpack Boost
+	// if the user clicked the admin notice.
+	if ( $migration_status !== 'notice' ) {
+		return;
+	}
+
+	// Check if Boost has Page Cache already enabled.
+	$status = new Status( Page_Cache::get_slug() );
+	if ( $status->get() === true ) {
+		return;
+	}
+
+	set_transient( 'jb_boost_migration_complete', true, 7 * DAY_IN_SECONDS );
+	$status->set( true );
+}
+
+add_action( 'admin_init', __NAMESPACE__ . '\migrate_from_super_cache' );