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Editing: class.jetpack-sync-functions.php

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<?php

/*
 * Utility functions to generate data synced to wpcom
 */

class Jetpack_Sync_Functions {
	const HTTPS_CHECK_OPTION_PREFIX = 'jetpack_sync_https_history_';
	const HTTPS_CHECK_HISTORY = 5;

public static function get_modules() {
		require_once( JETPACK__PLUGIN_DIR . 'class.jetpack-admin.php' );

return Jetpack_Admin::init()->get_modules();
	}

public static function get_taxonomies() {
		global $wp_taxonomies;
		$wp_taxonomies_without_callbacks = array();
		foreach ( $wp_taxonomies as $taxonomy_name => $taxonomy ) {
			$sanitized_taxonomy = self::sanitize_taxonomy( $taxonomy );
			if ( ! empty( $sanitized_taxonomy ) ) {
				$wp_taxonomies_without_callbacks[ $taxonomy_name ] = $sanitized_taxonomy;
	 		} else {
				error_log( 'Jetpack: Encountered a recusive taxonomy:' . $taxonomy_name );
			}
		}
		return $wp_taxonomies_without_callbacks;
	}

public static function get_shortcodes() {
		global $shortcode_tags;
		return array_keys( $shortcode_tags );
	}

/**
	 * Removes any callback data since we will not be able to process it on our side anyways.
	 */
	public static function sanitize_taxonomy( $taxonomy ) {

// Lets clone the taxonomy object instead of modifing the global one.
		$cloned_taxonomy = json_decode( wp_json_encode( $taxonomy ) );

// recursive taxonomies are no fun.
		if ( is_null( $cloned_taxonomy ) ) {
			return null;
		}
		// Remove any meta_box_cb if they are not the default wp ones.
		if ( isset( $cloned_taxonomy->meta_box_cb ) &&
		     ! in_array( $cloned_taxonomy->meta_box_cb, array( 'post_tags_meta_box', 'post_categories_meta_box' ) ) ) {
			$cloned_taxonomy->meta_box_cb = null;
		}
		// Remove update call back
		if ( isset( $cloned_taxonomy->update_count_callback ) &&
		     ! is_null( $cloned_taxonomy->update_count_callback ) ) {
			$cloned_taxonomy->update_count_callback = null;
		}
		// Remove rest_controller_class if it something other then the default.
		if ( isset( $cloned_taxonomy->rest_controller_class )  &&
		     'WP_REST_Terms_Controller' !== $cloned_taxonomy->rest_controller_class ) {
			$cloned_taxonomy->rest_controller_class = null;
		}
		return $cloned_taxonomy;
	}

public static function get_post_types() {
		global $wp_post_types;

return $wp_post_types;
	}

public static function get_post_type_features() {
		global $_wp_post_type_features;

return $_wp_post_type_features;
	}

public static function get_hosting_provider() {
		if ( defined( 'GD_SYSTEM_PLUGIN_DIR' ) || class_exists( '\\WPaaS\\Plugin' ) ) {
			return 'gd-managed-wp';
		}
		if ( defined( 'MM_BASE_DIR' ) ) {
			return 'bh';
		} 
		if ( defined( 'IS_PRESSABLE' ) ) {
			return 'pressable';
		} 
		if ( function_exists( 'is_wpe' ) || function_exists( 'is_wpe_snapshot' ) ) {
			return 'wpe';
		}
		if ( defined( 'VIP_GO_ENV' ) && false !== VIP_GO_ENV ) {
			return 'vip-go';
		}
		return 'unknown';
	}

public static function rest_api_allowed_post_types() {
		/** This filter is already documented in class.json-api-endpoints.php */
		return apply_filters( 'rest_api_allowed_post_types', array( 'post', 'page', 'revision' ) );
	}

public static function rest_api_allowed_public_metadata() {
		/** This filter is documented in json-endpoints/class.wpcom-json-api-post-endpoint.php */
		return apply_filters( 'rest_api_allowed_public_metadata', array() );
	}

/**
	 * Finds out if a site is using a version control system.
	 * @return bool
	 **/
	public static function is_version_controlled() {

if ( ! class_exists( 'WP_Automatic_Updater' ) ) {
			require_once( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' );
		}
		$updater = new WP_Automatic_Updater();

return (bool) strval( $updater->is_vcs_checkout( $context = ABSPATH ) );
	}

/**
	 * Returns true if the site has file write access false otherwise.
	 * @return bool
	 **/
	public static function file_system_write_access() {
		if ( ! function_exists( 'get_filesystem_method' ) ) {
			require_once( ABSPATH . 'wp-admin/includes/file.php' );
		}

require_once( ABSPATH . 'wp-admin/includes/template.php' );

$filesystem_method = get_filesystem_method();
		if ( 'direct' === $filesystem_method  ) {
			return true;
		}

ob_start();
		$filesystem_credentials_are_stored = request_filesystem_credentials( self_admin_url() );
		ob_end_clean();
		if ( $filesystem_credentials_are_stored ) {
			return true;
		}

return false;
	}

/**
	 * Helper function that is used when getting home or siteurl values. Decides
	 * whether to get the raw or filtered value.
	 *
	 * @return string
	 */
	public static function get_raw_or_filtered_url( $url_type ) {
		if (
			! Jetpack_Constants::is_defined( 'JETPACK_SYNC_USE_RAW_URL' ) ||
			Jetpack_Constants::get_constant( 'JETPACK_SYNC_USE_RAW_URL' )
		) {
			$url = self::get_raw_url( $url_type );
		} else {
			$url_function = ( 'home' == $url_type )
				? 'home_url'
				: 'site_url';
			$url = self::normalize_www_in_url( $url_type, $url_function );
			$url = self::get_protocol_normalized_url( $url_function, $url );
		}

return $url;
	}

public static function home_url() {
		$url = self::get_raw_or_filtered_url( 'home' );

/**
		 * Allows overriding of the home_url value that is synced back to WordPress.com.
		 *
		 * @since 5.2
		 *
		 * @param string $home_url
		 */
		return esc_url_raw( apply_filters( 'jetpack_sync_home_url', $url ) );
	}

public static function site_url() {
		$url = self::get_raw_or_filtered_url( 'siteurl' );

/**
		 * Allows overriding of the site_url value that is synced back to WordPress.com.
		 *
		 * @since 5.2
		 *
		 * @param string $site_url
		 */
		return esc_url_raw( apply_filters( 'jetpack_sync_site_url', $url ) );
	}

public static function main_network_site_url() {
		return self::get_protocol_normalized_url( 'main_network_site_url', network_site_url() );
	}

public static function get_protocol_normalized_url( $callable, $new_value ) {
		$option_key = self::HTTPS_CHECK_OPTION_PREFIX . $callable;

$parsed_url = wp_parse_url( $new_value );
		if ( ! $parsed_url ) {
			return $new_value;
		}

$scheme = $parsed_url['scheme'];
		$scheme_history = get_option( $option_key, array() );
		$scheme_history[] = $scheme;

// Limit length to self::HTTPS_CHECK_HISTORY
		$scheme_history = array_slice( $scheme_history, ( self::HTTPS_CHECK_HISTORY * -1 ) );

update_option( $option_key, $scheme_history );

$forced_scheme =  in_array( 'https', $scheme_history ) ? 'https' : 'http';

return set_url_scheme( $new_value, $forced_scheme );
	}

public static function get_raw_url( $option_name ) {
		$value = null;
		$constant = ( 'home' == $option_name )
			? 'WP_HOME'
			: 'WP_SITEURL';

if ( Jetpack_Constants::is_defined( $constant ) ) {
			$value = Jetpack_Constants::get_constant( $constant );
		} else {
			// Let's get the option from the database so that we can bypass filters. This will help
			// ensure that we get more uniform values.
			$value = Jetpack_Options::get_raw_option( $option_name );
		}

return $value;
	}

public static function normalize_www_in_url( $option, $url_function ) {
		$url        = wp_parse_url( call_user_func( $url_function ) );
		$option_url = wp_parse_url( get_option( $option ) );

if ( ! $option_url || ! $url ) {
			return $url;
		}

if ( $url[ 'host' ] === "www.{$option_url[ 'host' ]}" ) {
			// remove www if not present in option URL
			$url[ 'host' ] = $option_url[ 'host' ];
		}
		if ( $option_url[ 'host' ] === "www.{$url[ 'host' ]}" ) {
			// add www if present in option URL
			$url[ 'host' ] = $option_url[ 'host' ];
		}

$normalized_url = "{$url['scheme']}://{$url['host']}";
		if ( isset( $url['path'] ) ) {
			$normalized_url .= "{$url['path']}";
		}

if ( isset( $url['query'] ) ) {
			$normalized_url .= "?{$url['query']}";
		}

return $normalized_url;
	}

public static function get_plugins() {
		if ( ! function_exists( 'get_plugins' ) ) {
			require_once ABSPATH . 'wp-admin/includes/plugin.php';
		}

/** This filter is documented in wp-admin/includes/class-wp-plugins-list-table.php */
		return apply_filters( 'all_plugins', get_plugins() );
	}

public static function wp_version() {
		global $wp_version;

return $wp_version;
	}

public static function site_icon_url() {
		if ( ! function_exists( 'get_site_icon_url' ) || ! has_site_icon() ) {
			return get_option( 'jetpack_site_icon_url' );
		}

return get_site_icon_url();
	}

public static function roles() {
		$wp_roles = wp_roles();
		return $wp_roles->roles;
	}

}

Editing: class.jetpack-sync-functions.php

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