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/**
 * Class for testing automatic updates in the WordPress code.
 *
 * @package WordPress
 * @subpackage Site_Health
 * @since 5.2.0
 */

#[AllowDynamicProperties]
class WP_Site_Health_Auto_Updates {
	/**
	 * WP_Site_Health_Auto_Updates constructor.
	 *
	 * @since 5.2.0
	 */
	public function __construct() {
		require_once ABSPATH . &#039;wp-admin/includes/class-wp-upgrader.php&#039;;
	}


	/**
	 * Runs tests to determine if auto-updates can run.
	 *
	 * @since 5.2.0
	 *
	 * @return array The test results.
	 */
	public function run_tests() {
		$tests = array(
			$this-&gt;test_constants( &#039;WP_AUTO_UPDATE_CORE&#039;, array( true, &#039;beta&#039;, &#039;rc&#039;, &#039;development&#039;, &#039;branch-development&#039;, &#039;minor&#039; ) ),
			$this-&gt;test_wp_version_check_attached(),
			$this-&gt;test_filters_automatic_updater_disabled(),
			$this-&gt;test_wp_automatic_updates_disabled(),
			$this-&gt;test_if_failed_update(),
			$this-&gt;test_vcs_abspath(),
			$this-&gt;test_check_wp_filesystem_method(),
			$this-&gt;test_all_files_writable(),
			$this-&gt;test_accepts_dev_updates(),
			$this-&gt;test_accepts_minor_updates(),
		);

		$tests = array_filter( $tests );
		$tests = array_map(
			static function ( $test ) {
				$test = (object) $test;

				if ( empty( $test-&gt;severity ) ) {
					$test-&gt;severity = &#039;warning&#039;;
				}

				return $test;
			},
			$tests
		);

		return $tests;
	}

	/**
	 * Tests 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|null The test results if there are any constants set incorrectly,
	 *                    or null if the test passed.
	 */
	public function test_constants( $constant, $value ) {
		$acceptable_values = (array) $value;

		if ( defined( $constant ) &amp;&amp; ! in_array( constant( $constant ), $acceptable_values, true ) ) {
			return array(
				&#039;description&#039; =&gt; sprintf(
					/* translators: 1: Name of the constant used. 2: Value of the constant used. */
					__( &#039;The %1$s constant is defined as %2$s&#039; ),
					&quot;&lt;code&gt;$constant&lt;/code&gt;&quot;,
					&#039;&lt;code&gt;&#039; . esc_html( var_export( constant( $constant ), true ) ) . &#039;&lt;/code&gt;&#039;
				),
				&#039;severity&#039;    =&gt; &#039;fail&#039;,
			);
		}

		return null;
	}

	/**
	 * Checks if updates are intercepted by a filter.
	 *
	 * @since 5.2.0
	 *
	 * @return array|null The test results if wp_version_check() is disabled,
	 *                    or null if the test passed.
	 */
	public function test_wp_version_check_attached() {
		if ( ( ! is_multisite() || is_main_site() &amp;&amp; is_network_admin() )
			&amp;&amp; ! has_filter( &#039;wp_version_check&#039;, &#039;wp_version_check&#039; )
		) {
			return array(
				&#039;description&#039; =&gt; sprintf(
					/* translators: %s: Name of the filter used. */
					__( &#039;A plugin has prevented updates by disabling %s.&#039; ),
					&#039;&lt;code&gt;wp_version_check()&lt;/code&gt;&#039;
				),
				&#039;severity&#039;    =&gt; &#039;fail&#039;,
			);
		}

		return null;
	}

	/**
	 * Checks if automatic updates are disabled by a filter.
	 *
	 * @since 5.2.0
	 *
	 * @return array|null The test results if the {@see &#039;automatic_updater_disabled&#039;} filter is set,
	 *                    or null if the test passed.
	 */
	public function test_filters_automatic_updater_disabled() {
		/** This filter is documented in wp-admin/includes/class-wp-automatic-updater.php */
		if ( apply_filters( &#039;automatic_updater_disabled&#039;, false ) ) {
			return array(
				&#039;description&#039; =&gt; sprintf(
					/* translators: %s: Name of the filter used. */
					__( &#039;The %s filter is enabled.&#039; ),
					&#039;&lt;code&gt;automatic_updater_disabled&lt;/code&gt;&#039;
				),
				&#039;severity&#039;    =&gt; &#039;fail&#039;,
			);
		}

		return null;
	}

	/**
	 * Checks if automatic updates are disabled.
	 *
	 * @since 5.3.0
	 *
	 * @return array|false The test results if auto-updates are disabled, false otherwise.
	 */
	public function test_wp_automatic_updates_disabled() {
		if ( ! class_exists( &#039;WP_Automatic_Updater&#039; ) ) {
			require_once ABSPATH . &#039;wp-admin/includes/class-wp-automatic-updater.php&#039;;
		}

		$auto_updates = new WP_Automatic_Updater();

		if ( ! $auto_updates-&gt;is_disabled() ) {
			return false;
		}

		return array(
			&#039;description&#039; =&gt; __( &#039;All automatic updates are disabled.&#039; ),
			&#039;severity&#039;    =&gt; &#039;fail&#039;,
		);
	}

	/**
	 * Checks if automatic updates have tried to run, but failed, previously.
	 *
	 * @since 5.2.0
	 *
	 * @return array|false The test results if auto-updates previously failed, false otherwise.
	 */
	public function test_if_failed_update() {
		$failed = get_site_option( &#039;auto_core_update_failed&#039; );

		if ( ! $failed ) {
			return false;
		}

		if ( ! empty( $failed[&#039;critical&#039;] ) ) {
			$description  = __( &#039;A previous automatic background update ended with a critical failure, so updates are now disabled.&#039; );
			$description .= &#039; &#039; . __( &#039;You would have received an email because of this.&#039; );
			$description .= &#039; &#039; . __( &quot;When you&#039;ve been able to update using the \&quot;Update now\&quot; button on Dashboard &gt; Updates, this error will be cleared for future update attempts.&quot; );
			$description .= &#039; &#039; . sprintf(
				/* translators: %s: Code of error shown. */
				__( &#039;The error code was %s.&#039; ),
				&#039;&lt;code&gt;&#039; . $failed[&#039;error_code&#039;] . &#039;&lt;/code&gt;&#039;
			);
			return array(
				&#039;description&#039; =&gt; $description,
				&#039;severity&#039;    =&gt; &#039;warning&#039;,
			);
		}

		$description = __( &#039;A previous automatic background update could not occur.&#039; );
		if ( empty( $failed[&#039;retry&#039;] ) ) {
			$description .= &#039; &#039; . __( &#039;You would have received an email because of this.&#039; );
		}

		$description .= &#039; &#039; . __( &#039;Another attempt will be made with the next release.&#039; );
		$description .= &#039; &#039; . sprintf(
			/* translators: %s: Code of error shown. */
			__( &#039;The error code was %s.&#039; ),
			&#039;&lt;code&gt;&#039; . $failed[&#039;error_code&#039;] . &#039;&lt;/code&gt;&#039;
		);
		return array(
			&#039;description&#039; =&gt; $description,
			&#039;severity&#039;    =&gt; &#039;warning&#039;,
		);
	}

	/**
	 * Checks 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( &#039;.svn&#039;, &#039;.git&#039;, &#039;.hg&#039;, &#039;.bzr&#039; );
		$check_dirs   = array();

		foreach ( $context_dirs as $context_dir ) {
			// Walk up from $context_dir to the root.
			do {
				$check_dirs[] = $context_dir;

				// Once we&#039;ve hit &#039;/&#039; or &#039;C:\&#039;, 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 );
		$updater    = new WP_Automatic_Updater();
		$checkout   = false;

		// Search all directories we&#039;ve found for evidence of version control.
		foreach ( $vcs_dirs as $vcs_dir ) {
			foreach ( $check_dirs as $check_dir ) {
				if ( ! $updater-&gt;is_allowed_dir( $check_dir ) ) {
					continue;
				}

				$checkout = is_dir( rtrim( $check_dir, &#039;\\/&#039; ) . &quot;/$vcs_dir&quot; );
				if ( $checkout ) {
					break 2;
				}
			}
		}

		/** This filter is documented in wp-admin/includes/class-wp-automatic-updater.php */
		if ( $checkout &amp;&amp; ! apply_filters( &#039;automatic_updates_is_vcs_checkout&#039;, true, ABSPATH ) ) {
			return array(
				&#039;description&#039; =&gt; sprintf(
					/* translators: 1: Folder name. 2: Version control directory. 3: Filter name. */
					__( &#039;The folder %1$s was detected as being under version control (%2$s), but the %3$s filter is allowing updates.&#039; ),
					&#039;&lt;code&gt;&#039; . $check_dir . &#039;&lt;/code&gt;&#039;,
					&quot;&lt;code&gt;$vcs_dir&lt;/code&gt;&quot;,
					&#039;&lt;code&gt;automatic_updates_is_vcs_checkout&lt;/code&gt;&#039;
				),
				&#039;severity&#039;    =&gt; &#039;info&#039;,
			);
		}

		if ( $checkout ) {
			return array(
				&#039;description&#039; =&gt; sprintf(
					/* translators: 1: Folder name. 2: Version control directory. */
					__( &#039;The folder %1$s was detected as being under version control (%2$s).&#039; ),
					&#039;&lt;code&gt;&#039; . $check_dir . &#039;&lt;/code&gt;&#039;,
					&quot;&lt;code&gt;$vcs_dir&lt;/code&gt;&quot;
				),
				&#039;severity&#039;    =&gt; &#039;warning&#039;,
			);
		}

		return array(
			&#039;description&#039; =&gt; __( &#039;No version control systems were detected.&#039; ),
			&#039;severity&#039;    =&gt; &#039;pass&#039;,
		);
	}

	/**
	 * Checks if we can access files without providing credentials.
	 *
	 * @since 5.2.0
	 *
	 * @return array The test results.
	 */
	public function test_check_wp_filesystem_method() {
		// Make sure the `request_filesystem_credentials()` function is available during our REST API call.
		if ( ! function_exists( &#039;request_filesystem_credentials&#039; ) ) {
			require_once ABSPATH . &#039;wp-admin/includes/file.php&#039;;
		}

		$skin    = new Automatic_Upgrader_Skin();
		$success = $skin-&gt;request_filesystem_credentials( false, ABSPATH );

		if ( ! $success ) {
			$description  = __( &#039;Your installation of WordPress prompts for FTP credentials to perform updates.&#039; );
			$description .= &#039; &#039; . __( &#039;(Your site is performing updates over FTP due to file ownership. Talk to your hosting company.)&#039; );

			return array(
				&#039;description&#039; =&gt; $description,
				&#039;severity&#039;    =&gt; &#039;fail&#039;,
			);
		}

		return array(
			&#039;description&#039; =&gt; __( &#039;Your installation of WordPress does not require FTP credentials to perform updates.&#039; ),
			&#039;severity&#039;    =&gt; &#039;pass&#039;,
		);
	}

	/**
	 * Checks 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 if at least some of WordPress core files are writeable,
	 *                     or if a list of the checksums could not be retrieved from WordPress.org.
	 *                     False if the core files are not writeable.
	 */
	public function test_all_files_writable() {
		global $wp_filesystem;

		require ABSPATH . WPINC . &#039;/version.php&#039;; // $wp_version; // x.y.z

		$skin    = new Automatic_Upgrader_Skin();
		$success = $skin-&gt;request_filesystem_credentials( false, ABSPATH );

		if ( ! $success ) {
			return false;
		}

		WP_Filesystem();

		if ( &#039;direct&#039; !== $wp_filesystem-&gt;method ) {
			return false;
		}

		// Make sure the `get_core_checksums()` function is available during our REST API call.
		if ( ! function_exists( &#039;get_core_checksums&#039; ) ) {
			require_once ABSPATH . &#039;wp-admin/includes/update.php&#039;;
		}

		$checksums = get_core_checksums( $wp_version, &#039;en_US&#039; );
		$dev       = ( str_contains( $wp_version, &#039;-&#039; ) );
		// Get the last stable version&#039;s files and test against that.
		if ( ! $checksums &amp;&amp; $dev ) {
			$checksums = get_core_checksums( (float) $wp_version - 0.1, &#039;en_US&#039; );
		}

		// There aren&#039;t always checksums for development releases, so just skip the test if we still can&#039;t find any.
		if ( ! $checksums &amp;&amp; $dev ) {
			return false;
		}

		if ( ! $checksums ) {
			$description = sprintf(
				/* translators: %s: WordPress version. */
				__( &quot;Couldn&#039;t retrieve a list of the checksums for WordPress %s.&quot; ),
				$wp_version
			);
			$description .= &#039; &#039; . __( &#039;This could mean that connections are failing to WordPress.org.&#039; );
			return array(
				&#039;description&#039; =&gt; $description,
				&#039;severity&#039;    =&gt; &#039;warning&#039;,
			);
		}

		$unwritable_files = array();
		foreach ( array_keys( $checksums ) as $file ) {
			if ( str_starts_with( $file, &#039;wp-content&#039; ) ) {
				continue;
			}
			if ( ! file_exists( ABSPATH . $file ) ) {
				continue;
			}
			if ( ! is_writable( ABSPATH . $file ) ) {
				$unwritable_files[] = $file;
			}
		}

		if ( $unwritable_files ) {
			if ( count( $unwritable_files ) &gt; 20 ) {
				$unwritable_files   = array_slice( $unwritable_files, 0, 20 );
				$unwritable_files[] = &#039;...&#039;;
			}
			return array(
				&#039;description&#039; =&gt; __( &#039;Some files are not writable by WordPress:&#039; ) . &#039; &lt;ul&gt;&lt;li&gt;&#039; . implode( &#039;&lt;/li&gt;&lt;li&gt;&#039;, $unwritable_files ) . &#039;&lt;/li&gt;&lt;/ul&gt;&#039;,
				&#039;severity&#039;    =&gt; &#039;fail&#039;,
			);
		} else {
			return array(
				&#039;description&#039; =&gt; __( &#039;All of your WordPress files are writable.&#039; ),
				&#039;severity&#039;    =&gt; &#039;pass&#039;,
			);
		}
	}

	/**
	 * Checks if the install is using a development branch and can use nightly packages.
	 *
	 * @since 5.2.0
	 *
	 * @return array|false|null The test results if development updates are blocked.
	 *                          False if it isn&#039;t a development version. Null if the test passed.
	 */
	public function test_accepts_dev_updates() {
		require ABSPATH . WPINC . &#039;/version.php&#039;; // $wp_version; // x.y.z
		// Only for dev versions.
		if ( ! str_contains( $wp_version, &#039;-&#039; ) ) {
			return false;
		}

		if ( defined( &#039;WP_AUTO_UPDATE_CORE&#039; ) &amp;&amp; ( &#039;minor&#039; === WP_AUTO_UPDATE_CORE || false === WP_AUTO_UPDATE_CORE ) ) {
			return array(
				&#039;description&#039; =&gt; sprintf(
					/* translators: %s: Name of the constant used. */
					__( &#039;WordPress development updates are blocked by the %s constant.&#039; ),
					&#039;&lt;code&gt;WP_AUTO_UPDATE_CORE&lt;/code&gt;&#039;
				),
				&#039;severity&#039;    =&gt; &#039;fail&#039;,
			);
		}

		/** This filter is documented in wp-admin/includes/class-core-upgrader.php */
		if ( ! apply_filters( &#039;allow_dev_auto_core_updates&#039;, $wp_version ) ) {
			return array(
				&#039;description&#039; =&gt; sprintf(
					/* translators: %s: Name of the filter used. */
					__( &#039;WordPress development updates are blocked by the %s filter.&#039; ),
					&#039;&lt;code&gt;allow_dev_auto_core_updates&lt;/code&gt;&#039;
				),
				&#039;severity&#039;    =&gt; &#039;fail&#039;,
			);
		}

		return null;
	}

	/**
	 * Checks if the site supports automatic minor updates.
	 *
	 * @since 5.2.0
	 *
	 * @return array|null The test results if minor updates are blocked,
	 *                    or null if the test passed.
	 */
	public function test_accepts_minor_updates() {
		if ( defined( &#039;WP_AUTO_UPDATE_CORE&#039; ) &amp;&amp; false === WP_AUTO_UPDATE_CORE ) {
			return array(
				&#039;description&#039; =&gt; sprintf(
					/* translators: %s: Name of the constant used. */
					__( &#039;WordPress security and maintenance releases are blocked by %s.&#039; ),
					&quot;&lt;code&gt;define( &#039;WP_AUTO_UPDATE_CORE&#039;, false );&lt;/code&gt;&quot;
				),
				&#039;severity&#039;    =&gt; &#039;fail&#039;,
			);
		}

		/** This filter is documented in wp-admin/includes/class-core-upgrader.php */
		if ( ! apply_filters( &#039;allow_minor_auto_core_updates&#039;, true ) ) {
			return array(
				&#039;description&#039; =&gt; sprintf(
					/* translators: %s: Name of the filter used. */
					__( &#039;WordPress security and maintenance releases are blocked by the %s filter.&#039; ),
					&#039;&lt;code&gt;allow_minor_auto_core_updates&lt;/code&gt;&#039;
				),
				&#039;severity&#039;    =&gt; &#039;fail&#039;,
			);
		}

		return null;
	}
}
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