<?php

/**

 * Class for testing automatic updates in the WordPress code.

 *

 * @package WordPress

 * @subpackage Site_Health

 * @since 5.2.0

 */

class WP_Site_Health_Auto_Updates {

	/**

	 * WP_Site_Health_Auto_Updates constructor.

	 *

	 * @since 5.2.0

	 */

	public function __construct() {

		require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';

	}

	/**

	 * Run tests to determine if auto-updates can run.

	 *

	 * @since 5.2.0

	 *

	 * @return array The test results.

	 */

	public function run_tests() {

		$tests = array(

			$this->test_constants( 'WP_AUTO_UPDATE_CORE', array( true, 'beta', 'rc', 'development', 'branch-development', 'minor' ) ),

			$this->test_wp_version_check_attached(),

			$this->test_filters_automatic_updater_disabled(),

			$this->test_wp_automatic_updates_disabled(),

			$this->test_if_failed_update(),

			$this->test_vcs_abspath(),

			$this->test_check_wp_filesystem_method(),

			$this->test_all_files_writable(),

			$this->test_accepts_dev_updates(),

			$this->test_accepts_minor_updates(),

		);

		$tests = array_filter( $tests );

		$tests = array_map(

				$test = (object) $test;

				if ( empty( $test->severity ) ) {

					$test->severity = 'warning';

				}

				return $test;

			},

			$tests

		);

		return $tests;

	}

	/**

	 * Test if auto-updates related constants are set correctly.

	 *

	 * @since 5.2.0

	 * @since 5.5.1 The `$value` parameter can accept an array.

	 *

	 * @param string $constant         The name of the constant to check.

	 * @param bool|string|array $value The value that the constant should be, if set,

	 *                                 or an array of acceptable values.

	 * @return array The test results.

	 */

	public function test_constants( $constant, $value ) {

		$acceptable_values = (array) $value;

		if ( defined( $constant ) && ! in_array( constant( $constant ), $acceptable_values, true ) ) {

			return array(

				'description' => sprintf(

					/* translators: %s: Name of the constant used. */

					__( 'The %s constant is defined and enabled.' ),

					"<code>$constant</code>"

				),

				'severity'    => 'fail',

			);

		}

	}

	/**

	 * Check if updates are intercepted by a filter.

	 *

	 * @since 5.2.0

	 *

	 * @return array The test results.

	 */

	public function test_wp_version_check_attached() {

		if ( ( ! is_multisite() || is_main_site() && is_network_admin() )

			&& ! has_filter( 'wp_version_check', 'wp_version_check' )

		) {

			return array(

				'description' => sprintf(

					/* translators: %s: Name of the filter used. */

					__( 'A plugin has prevented updates by disabling %s.' ),

					'<code>wp_version_check()</code>'

				),

				'severity'    => 'fail',

			);

		}

	}

	/**

	 * Check if automatic updates are disabled by a filter.

	 *

	 * @since 5.2.0

	 *

	 * @return array The test results.

	 */

	public function test_filters_automatic_updater_disabled() {

		/** This filter is documented in wp-admin/includes/class-wp-automatic-updater.php */

		if ( apply_filters( 'automatic_updater_disabled', false ) ) {

			return array(

				'description' => sprintf(

					/* translators: %s: Name of the filter used. */

					__( 'The %s filter is enabled.' ),

					'<code>automatic_updater_disabled</code>'

				),

				'severity'    => 'fail',

			);

		}

	}

	/**

	 * Check if automatic updates are disabled.

	 *

	 * @since 5.3.0

	 *

	 * @return array|false The test results. False if auto-updates are enabled.

	 */

	public function test_wp_automatic_updates_disabled() {

		if ( ! class_exists( 'WP_Automatic_Updater' ) ) {

			require_once ABSPATH . 'wp-admin/includes/class-wp-automatic-updater.php';

		}

		$auto_updates = new WP_Automatic_Updater();

		if ( ! $auto_updates->is_disabled() ) {

			return false;

		}

		return array(

			'description' => __( 'All automatic updates are disabled.' ),

			'severity'    => 'fail',

		);

	}

	/**

	 * Check if automatic updates have tried to run, but failed, previously.

	 *

	 * @since 5.2.0

	 *

	 * @return array|false The test results. False if the auto-updates failed.

	 */

		$failed = get_site_option( 'auto_core_update_failed' );

		if ( ! $failed ) {

			return false;

		}

		if ( ! empty( $failed['critical'] ) ) {

			$description  = __( 'A previous automatic background update ended with a critical failure, so updates are now disabled.' );

			$description .= ' ' . __( 'You would have received an email because of this.' );

			$description .= ' ' . __( "When you've been able to update using the \"Update now\" button on Dashboard > Updates, we'll clear this error for future update attempts." );

			$description .= ' ' . sprintf(

				/* translators: %s: Code of error shown. */

				__( 'The error code was %s.' ),

				'<code>' . $failed['error_code'] . '</code>'

			);

			return array(

				'description' => $description,

				'severity'    => 'warning',

			);

		}

		$description = __( 'A previous automatic background update could not occur.' );

		if ( empty( $failed['retry'] ) ) {

			$description .= ' ' . __( 'You would have received an email because of this.' );

		}

		$description .= ' ' . __( "We'll try again with the next release." );

		$description .= ' ' . sprintf(

			/* translators: %s: Code of error shown. */

			__( 'The error code was %s.' ),

			'<code>' . $failed['error_code'] . '</code>'

		);

		return array(

			'description' => $description,

			'severity'    => 'warning',

		);

	}

	/**

	 * Check if WordPress is controlled by a VCS (Git, Subversion etc).

	 *

	 * @since 5.2.0

	 *

	 * @return array The test results.

	 */

	public function test_vcs_abspath() {

		$context_dirs = array( ABSPATH );

		$vcs_dirs     = array( '.svn', '.git', '.hg', '.bzr' );

		$check_dirs   = array();

		foreach ( $context_dirs as $context_dir ) {

			// Walk up from $context_dir to the root.

			do {

				$check_dirs[] = $context_dir;

				// Once we've hit '/' or 'C:\', we need to stop. dirname will keep returning the input here.

				if ( dirname( $context_dir ) === $context_dir ) {

					break;

				}

				// Continue one level at a time.

			} while ( $context_dir = dirname( $context_dir ) );

		}

		$check_dirs = array_unique( $check_dirs );

		// Search all directories we've found for evidence of version control.

		foreach ( $vcs_dirs as $vcs_dir ) {

			foreach ( $check_dirs as $check_dir ) {

				if ( $checkout = @is_dir( rtrim( $check_dir, '\\/' ) . "/$vcs_dir" ) ) {

					break 2;

				}

			}

		}

		/** This filter is documented in wp-admin/includes/class-wp-automatic-updater.php */

		if ( $checkout && ! apply_filters( 'automatic_updates_is_vcs_checkout', true, ABSPATH ) ) {

			return array(

				'description' => sprintf(

					/* translators: 1: Folder name. 2: Version control directory. 3: Filter name. */

					__( 'The folder %1$s was detected as being under version control (%2$s), but the %3$s filter is allowing updates.' ),

					'<code>' . $check_dir . '</code>',

					"<code>$vcs_dir</code>",

					'<code>automatic_updates_is_vcs_checkout</code>'

				),

				'severity'    => 'info',

			);

		}

		if ( $checkout ) {

			return array(

				'description' => sprintf(

					/* translators: 1: Folder name. 2: Version control directory. */

					__( 'The folder %1$s was detected as being under version control (%2$s).' ),

					'<code>' . $check_dir . '</code>',

					"<code>$vcs_dir</code>"

				),

				'severity'    => 'warning',

			);

		}

		return array(

			'description' => __( 'No version control systems were detected.' ),

			'severity'    => 'pass',

		);

	}

	/**

	 * Check if we can access files without providing credentials.

	 *

	 * @since 5.2.0

	 *

	 * @return array The test results.

	 */

		// Make sure the `request_filesystem_credentials()` function is available during our REST API call.

		if ( ! function_exists( 'request_filesystem_credentials' ) ) {

			require_once ABSPATH . '/wp-admin/includes/file.php';

		}

		$skin    = new Automatic_Upgrader_Skin;

		$success = $skin->request_filesystem_credentials( false, ABSPATH );

		if ( ! $success ) {

			$description  = __( 'Your installation of WordPress prompts for FTP credentials to perform updates.' );

			$description .= ' ' . __( '(Your site is performing updates over FTP due to file ownership. Talk to your hosting company.)' );

			return array(

				'description' => $description,

				'severity'    => 'fail',

			);

		}

		return array(

			'severity'    => 'pass',

		);

	}

	/**

	 * Check if core files are writable by the web user/group.

	 *

	 * @since 5.2.0

	 *

	 * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass.

	 *

	 * @return array|false The test results. False if they're not writeable.

	 */

		global $wp_filesystem;

		require ABSPATH . WPINC . '/version.php'; // $wp_version; // x.y.z

		$skin    = new Automatic_Upgrader_Skin;

		$success = $skin->request_filesystem_credentials( false, ABSPATH );

		if ( ! $success ) {

			return false;

		}

		WP_Filesystem();

		if ( 'direct' !== $wp_filesystem->method ) {

			return false;

		}

		// Make sure the `get_core_checksums()` function is available during our REST API call.

		if ( ! function_exists( 'get_core_checksums' ) ) {

			require_once ABSPATH . '/wp-admin/includes/update.php';

		}

		$checksums = get_core_checksums( $wp_version, 'en_US' );

		$dev       = ( false !== strpos( $wp_version, '-' ) );

		// Get the last stable version's files and test against that.

		if ( ! $checksums && $dev ) {

			$checksums = get_core_checksums( (float) $wp_version - 0.1, 'en_US' );

		}

		// There aren't always checksums for development releases, so just skip the test if we still can't find any.

		if ( ! $checksums && $dev ) {

			return false;

		}

		if ( ! $checksums ) {

			$description = sprintf(

				/* translators: %s: WordPress version. */

				__( "Couldn't retrieve a list of the checksums for WordPress %s." ),

				$wp_version

			);

			$description .= ' ' . __( 'This could mean that connections are failing to WordPress.org.' );

			return array(

				'description' => $description,

				'severity'    => 'warning',

			);

		}

		$unwritable_files = array();

		foreach ( array_keys( $checksums ) as $file ) {

			if ( 'wp-content' === substr( $file, 0, 10 ) ) {

				continue;

			}

			if ( ! file_exists( ABSPATH . $file ) ) {

				continue;

			}

			if ( ! is_writable( ABSPATH . $file ) ) {

				$unwritable_files[] = $file;

			}

		}

		if ( $unwritable_files ) {

			if ( count( $unwritable_files ) > 20 ) {

				$unwritable_files   = array_slice( $unwritable_files, 0, 20 );

				$unwritable_files[] = '...';

			}

			return array(

				'description' => __( 'Some files are not writable by WordPress:' ) . ' <ul><li>' . implode( '</li><li>', $unwritable_files ) . '</li></ul>',

				'severity'    => 'fail',

			);

		} else {

			return array(

				'description' => __( 'All of your WordPress files are writable.' ),

				'severity'    => 'pass',

			);

		}

	}

	/**

	 * Check if the install is using a development branch and can use nightly packages.

	 *

	 * @since 5.2.0

	 *

	 * @return array|false The test results. False if it isn't a development version.

	 */

		require ABSPATH . WPINC . '/version.php'; // $wp_version; // x.y.z

		// Only for dev versions.

		if ( false === strpos( $wp_version, '-' ) ) {

			return false;

		}

		if ( defined( 'WP_AUTO_UPDATE_CORE' ) && ( 'minor' === WP_AUTO_UPDATE_CORE || false === WP_AUTO_UPDATE_CORE ) ) {

			return array(

				'description' => sprintf(

					/* translators: %s: Name of the constant used. */

					__( 'WordPress development updates are blocked by the %s constant.' ),

					'<code>WP_AUTO_UPDATE_CORE</code>'

				),

				'severity'    => 'fail',

			);

		}

		/** This filter is documented in wp-admin/includes/class-core-upgrader.php */

		if ( ! apply_filters( 'allow_dev_auto_core_updates', $wp_version ) ) {

			return array(

				'description' => sprintf(

					/* translators: %s: Name of the filter used. */

					__( 'WordPress development updates are blocked by the %s filter.' ),

					'<code>allow_dev_auto_core_updates</code>'

				),

				'severity'    => 'fail',

			);

		}

	}

	/**

	 * Check if the site supports automatic minor updates.

	 *

	 * @since 5.2.0

	 *

	 * @return array The test results.

	 */

		if ( defined( 'WP_AUTO_UPDATE_CORE' ) && false === WP_AUTO_UPDATE_CORE ) {