--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/https-migration.php	Wed Sep 21 18:19:35 2022 +0200
@@ -0,0 +1,140 @@
+<?php
+/**
+ * HTTPS migration functions.
+ *
+ * @package WordPress
+ * @since 5.7.0
+ */
+
+/**
+ * Checks whether WordPress should replace old HTTP URLs to the site with their HTTPS counterpart.
+ *
+ * If a WordPress site had its URL changed from HTTP to HTTPS, by default this will return `true`, causing WordPress to
+ * add frontend filters to replace insecure site URLs that may be present in older database content. The
+ * {@see 'wp_should_replace_insecure_home_url'} filter can be used to modify that behavior.
+ *
+ * @since 5.7.0
+ *
+ * @return bool True if insecure URLs should replaced, false otherwise.
+ */
+function wp_should_replace_insecure_home_url() {
+	$should_replace_insecure_home_url = wp_is_using_https()
+		&& get_option( 'https_migration_required' )
+		// For automatic replacement, both 'home' and 'siteurl' need to not only use HTTPS, they also need to be using
+		// the same domain.
+		&& wp_parse_url( home_url(), PHP_URL_HOST ) === wp_parse_url( site_url(), PHP_URL_HOST );
+
+	/**
+	 * Filters whether WordPress should replace old HTTP URLs to the site with their HTTPS counterpart.
+	 *
+	 * If a WordPress site had its URL changed from HTTP to HTTPS, by default this will return `true`. This filter can
+	 * be used to disable that behavior, e.g. after having replaced URLs manually in the database.
+	 *
+	 * @since 5.7.0
+	 *
+	 * @param bool $should_replace_insecure_home_url Whether insecure HTTP URLs to the site should be replaced.
+	 */
+	return apply_filters( 'wp_should_replace_insecure_home_url', $should_replace_insecure_home_url );
+}
+
+/**
+ * Replaces insecure HTTP URLs to the site in the given content, if configured to do so.
+ *
+ * This function replaces all occurrences of the HTTP version of the site's URL with its HTTPS counterpart, if
+ * determined via {@see wp_should_replace_insecure_home_url()}.
+ *
+ * @since 5.7.0
+ *
+ * @param string $content Content to replace URLs in.
+ * @return string Filtered content.
+ */
+function wp_replace_insecure_home_url( $content ) {
+	if ( ! wp_should_replace_insecure_home_url() ) {
+		return $content;
+	}
+
+	$https_url = home_url( '', 'https' );
+	$http_url  = str_replace( 'https://', 'http://', $https_url );
+
+	// Also replace potentially escaped URL.
+	$escaped_https_url = str_replace( '/', '\/', $https_url );
+	$escaped_http_url  = str_replace( '/', '\/', $http_url );
+
+	return str_replace(
+		array(
+			$http_url,
+			$escaped_http_url,
+		),
+		array(
+			$https_url,
+			$escaped_https_url,
+		),
+		$content
+	);
+}
+
+/**
+ * Update the 'home' and 'siteurl' option to use the HTTPS variant of their URL.
+ *
+ * If this update does not result in WordPress recognizing that the site is now using HTTPS (e.g. due to constants
+ * overriding the URLs used), the changes will be reverted. In such a case the function will return false.
+ *
+ * @since 5.7.0
+ *
+ * @return bool True on success, false on failure.
+ */
+function wp_update_urls_to_https() {
+	// Get current URL options.
+	$orig_home    = get_option( 'home' );
+	$orig_siteurl = get_option( 'siteurl' );
+
+	// Get current URL options, replacing HTTP with HTTPS.
+	$home    = str_replace( 'http://', 'https://', $orig_home );
+	$siteurl = str_replace( 'http://', 'https://', $orig_siteurl );
+
+	// Update the options.
+	update_option( 'home', $home );
+	update_option( 'siteurl', $siteurl );
+
+	if ( ! wp_is_using_https() ) {
+		// If this did not result in the site recognizing HTTPS as being used,
+		// revert the change and return false.
+		update_option( 'home', $orig_home );
+		update_option( 'siteurl', $orig_siteurl );
+		return false;
+	}
+
+	// Otherwise the URLs were successfully changed to use HTTPS.
+	return true;
+}
+
+/**
+ * Updates the 'https_migration_required' option if needed when the given URL has been updated from HTTP to HTTPS.
+ *
+ * If this is a fresh site, a migration will not be required, so the option will be set as `false`.
+ *
+ * This is hooked into the {@see 'update_option_home'} action.
+ *
+ * @since 5.7.0
+ * @access private
+ *
+ * @param mixed $old_url Previous value of the URL option.
+ * @param mixed $new_url New value of the URL option.
+ */
+function wp_update_https_migration_required( $old_url, $new_url ) {
+	// Do nothing if WordPress is being installed.
+	if ( wp_installing() ) {
+		return;
+	}
+
+	// Delete/reset the option if the new URL is not the HTTPS version of the old URL.
+	if ( untrailingslashit( (string) $old_url ) !== str_replace( 'https://', 'http://', untrailingslashit( (string) $new_url ) ) ) {
+		delete_option( 'https_migration_required' );
+		return;
+	}
+
+	// If this is a fresh site, there is no content to migrate, so do not require migration.
+	$https_migration_required = get_option( 'fresh_site' ) ? false : true;
+
+	update_option( 'https_migration_required', $https_migration_required );
+}