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<?php
/**
 * WordPress Administration Update API
 *
 * @package WordPress
 * @subpackage Administration
 */

/**
 * Selects the first update version from the update_core option.
 *
 * @since 2.7.0
 *
 * @return object|array|false The response from the API on success, false on failure.
 */
function get_preferred_from_update_core() {
	$updates = get_core_updates();

if ( ! is_array( $updates ) ) {
		return false;
	}

if ( empty( $updates ) ) {
		return (object) array( 'response' => 'latest' );
	}

return $updates[0];
}

/**
 * Gets available core updates.
 *
 * @since 2.7.0
 *
 * @param array $options Set $options['dismissed'] to true to show dismissed upgrades too,
 *                       set $options['available'] to false to skip not-dismissed updates.
 * @return array|false Array of the update objects on success, false on failure.
 */
function get_core_updates( $options = array() ) {
	$options = array_merge(
		array(
			'available' => true,
			'dismissed' => false,
		),
		$options
	);

$dismissed = get_site_option( 'dismissed_update_core' );

if ( ! is_array( $dismissed ) ) {
		$dismissed = array();
	}

$from_api = get_site_transient( 'update_core' );

if ( ! isset( $from_api->updates ) || ! is_array( $from_api->updates ) ) {
		return false;
	}

$updates = $from_api->updates;
	$result  = array();

foreach ( $updates as $update ) {
		if ( 'autoupdate' === $update->response ) {
			continue;
		}

if ( array_key_exists( $update->current . '|' . $update->locale, $dismissed ) ) {
			if ( $options['dismissed'] ) {
				$update->dismissed = true;
				$result[]          = $update;
			}
		} else {
			if ( $options['available'] ) {
				$update->dismissed = false;
				$result[]          = $update;
			}
		}
	}

return $result;
}

/**
 * Gets the best available (and enabled) Auto-Update for WordPress core.
 *
 * If there's 1.2.3 and 1.3 on offer, it'll choose 1.3 if the installation allows it, else, 1.2.3.
 *
 * @since 3.7.0
 *
 * @return object|false The core update offering on success, false on failure.
 */
function find_core_auto_update() {
	$updates = get_site_transient( 'update_core' );

if ( ! $updates || empty( $updates->updates ) ) {
		return false;
	}

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

$auto_update = false;
	$upgrader    = new WP_Automatic_Updater();

foreach ( $updates->updates as $update ) {
		if ( 'autoupdate' !== $update->response ) {
			continue;
		}

if ( ! $upgrader->should_update( 'core', $update, ABSPATH ) ) {
			continue;
		}

if ( ! $auto_update || version_compare( $update->current, $auto_update->current, '>' ) ) {
			$auto_update = $update;
		}
	}

return $auto_update;
}

/**
 * Gets and caches the checksums for the given version of WordPress.
 *
 * @since 3.7.0
 *
 * @param string $version Version string to query.
 * @param string $locale  Locale to query.
 * @return array|false An array of checksums on success, false on failure.
 */
function get_core_checksums( $version, $locale ) {
	$http_url = 'http://api.wordpress.org/core/checksums/1.0/?' . http_build_query( compact( 'version', 'locale' ), '', '&' );
	$url      = $http_url;

$ssl = wp_http_supports( array( 'ssl' ) );

if ( $ssl ) {
		$url = set_url_scheme( $url, 'https' );
	}

$options = array(
		'timeout' => wp_doing_cron() ? 30 : 3,
	);

$response = wp_remote_get( $url, $options );

if ( $ssl && is_wp_error( $response ) ) {
		wp_trigger_error(
			__FUNCTION__,
			sprintf(
				/* translators: %s: Support forums URL. */
				__( 'An unexpected error occurred. Something may be wrong with WordPress.org or this server&#8217;s configuration. If you continue to have problems, please try the <a href="%s">support forums</a>.' ),
				__( 'https://wordpress.org/support/forums/' )
			) . ' ' . __( '(WordPress could not establish a secure connection to WordPress.org. Please contact your server administrator.)' ),
			headers_sent() || WP_DEBUG ? E_USER_WARNING : E_USER_NOTICE
		);

$response = wp_remote_get( $http_url, $options );
	}

if ( is_wp_error( $response ) || 200 !== wp_remote_retrieve_response_code( $response ) ) {
		return false;
	}

$body = trim( wp_remote_retrieve_body( $response ) );
	$body = json_decode( $body, true );

if ( ! is_array( $body ) || ! isset( $body['checksums'] ) || ! is_array( $body['checksums'] ) ) {
		return false;
	}

return $body['checksums'];
}

/**
 * Dismisses core update.
 *
 * @since 2.7.0
 *
 * @param object $update
 * @return bool
 */
function dismiss_core_update( $update ) {
	$dismissed = get_site_option( 'dismissed_update_core' );
	$dismissed[ $update->current . '|' . $update->locale ] = true;

return update_site_option( 'dismissed_update_core', $dismissed );
}

/**
 * Undismisses core update.
 *
 * @since 2.7.0
 *
 * @param string $version
 * @param string $locale
 * @return bool
 */
function undismiss_core_update( $version, $locale ) {
	$dismissed = get_site_option( 'dismissed_update_core' );
	$key       = $version . '|' . $locale;

if ( ! isset( $dismissed[ $key ] ) ) {
		return false;
	}

unset( $dismissed[ $key ] );

return update_site_option( 'dismissed_update_core', $dismissed );
}

/**
 * Finds the available update for WordPress core.
 *
 * @since 2.7.0
 *
 * @param string $version Version string to find the update for.
 * @param string $locale  Locale to find the update for.
 * @return object|false The core update offering on success, false on failure.
 */
function find_core_update( $version, $locale ) {
	$from_api = get_site_transient( 'update_core' );

if ( ! isset( $from_api->updates ) || ! is_array( $from_api->updates ) ) {
		return false;
	}

$updates = $from_api->updates;

foreach ( $updates as $update ) {
		if ( $update->current === $version && $update->locale === $locale ) {
			return $update;
		}
	}

return false;
}

/**
 * Returns core update footer message.
 *
 * @since 2.3.0
 *
 * @param string $msg
 * @return string
 */
function core_update_footer( $msg = '' ) {
	if ( ! current_user_can( 'update_core' ) ) {
		/* translators: %s: WordPress version. */
		return sprintf( __( 'Version %s' ), get_bloginfo( 'version', 'display' ) );
	}

$cur = get_preferred_from_update_core();

if ( ! is_object( $cur ) ) {
		$cur = new stdClass();
	}

if ( ! isset( $cur->current ) ) {
		$cur->current = '';
	}

if ( ! isset( $cur->response ) ) {
		$cur->response = '';
	}

$is_development_version = preg_match( '/alpha|beta|RC/', wp_get_wp_version() );

if ( $is_development_version ) {
		return sprintf(
			/* translators: 1: WordPress version number, 2: URL to WordPress Updates screen. */
			__( 'You are using a development version (%1$s). Cool! Please <a href="%2$s">stay updated</a>.' ),
			get_bloginfo( 'version', 'display' ),
			network_admin_url( 'update-core.php' )
		);
	}

switch ( $cur->response ) {
		case 'upgrade':
			return sprintf(
				'<a href="%s">%s</a>',
				network_admin_url( 'update-core.php' ),
				/* translators: %s: WordPress version. */
				sprintf( __( 'Get Version %s' ), $cur->current )
			);

case 'latest':
		default:
			/* translators: %s: WordPress version. */
			return sprintf( __( 'Version %s' ), get_bloginfo( 'version', 'display' ) );
	}
}

/**
 * Returns core update notification message.
 *
 * @since 2.3.0
 *
 * @global string $pagenow The filename of the current screen.
 * @return void|false
 */
function update_nag() {
	global $pagenow;

if ( is_multisite() && ! current_user_can( 'update_core' ) ) {
		return false;
	}

if ( 'update-core.php' === $pagenow ) {
		return;
	}

$cur = get_preferred_from_update_core();

if ( ! isset( $cur->response ) || 'upgrade' !== $cur->response ) {
		return false;
	}

$version_url = sprintf(
		/* translators: %s: WordPress version. */
		esc_url( __( 'https://wordpress.org/documentation/wordpress-version/version-%s/' ) ),
		sanitize_title( $cur->current )
	);

if ( current_user_can( 'update_core' ) ) {
		$msg = sprintf(
			/* translators: 1: URL to WordPress release notes, 2: New WordPress version, 3: URL to network admin, 4: Accessibility text. */
			__( '<a href="%1$s">WordPress %2$s</a> is available! <a href="%3$s" aria-label="%4$s">Please update now</a>.' ),
			$version_url,
			$cur->current,
			network_admin_url( 'update-core.php' ),
			esc_attr__( 'Please update WordPress now' )
		);
	} else {
		$msg = sprintf(
			/* translators: 1: URL to WordPress release notes, 2: New WordPress version. */
			__( '<a href="%1$s">WordPress %2$s</a> is available! Please notify the site administrator.' ),
			$version_url,
			$cur->current
		);
	}

wp_admin_notice(
		$msg,
		array(
			'type'               => 'warning',
			'additional_classes' => array( 'update-nag', 'inline' ),
			'paragraph_wrap'     => false,
		)
	);
}

/**
 * Displays WordPress version and active theme in the 'At a Glance' dashboard widget.
 *
 * @since 2.5.0
 */
function update_right_now_message() {
	$theme_name = wp_get_theme();

if ( current_user_can( 'switch_themes' ) ) {
		$theme_name = sprintf( '<a href="themes.php">%1$s</a>', $theme_name );
	}

$msg = '';

if ( current_user_can( 'update_core' ) ) {
		$cur = get_preferred_from_update_core();

if ( isset( $cur->response ) && 'upgrade' === $cur->response ) {
			$msg .= sprintf(
				'<a href="%s" class="button" aria-describedby="wp-version">%s</a> ',
				network_admin_url( 'update-core.php' ),
				/* translators: %s: WordPress version number, or 'Latest' string. */
				sprintf( __( 'Update to %s' ), $cur->current ? $cur->current : __( 'Latest' ) )
			);
		}
	}

/* translators: 1: Version number, 2: Theme name. */
	$content = __( 'WordPress %1$s running %2$s theme.' );

/**
	 * Filters the text displayed in the 'At a Glance' dashboard widget.
	 *
	 * Prior to 3.8.0, the widget was named 'Right Now'.
	 *
	 * @since 4.4.0
	 *
	 * @param string $content Default text.
	 */
	$content = apply_filters( 'update_right_now_text', $content );

$msg .= sprintf( '' . $content . '', get_bloginfo( 'version', 'display' ), $theme_name );

echo "$msg";
}

/**
 * Retrieves plugins with updates available.
 *
 * @since 2.9.0
 *
 * @return array
 */
function get_plugin_updates() {
	$all_plugins     = get_plugins();
	$upgrade_plugins = array();
	$current         = get_site_transient( 'update_plugins' );

foreach ( (array) $all_plugins as $plugin_file => $plugin_data ) {
		if ( isset( $current->response[ $plugin_file ] ) ) {
			$upgrade_plugins[ $plugin_file ]         = (object) $plugin_data;
			$upgrade_plugins[ $plugin_file ]->update = $current->response[ $plugin_file ];
		}
	}

return $upgrade_plugins;
}

/**
 * Adds a callback to display update information for plugins with updates available.
 *
 * @since 2.9.0
 */
function wp_plugin_update_rows() {
	if ( ! current_user_can( 'update_plugins' ) ) {
		return;
	}

$plugins = get_site_transient( 'update_plugins' );

if ( isset( $plugins->response ) && is_array( $plugins->response ) ) {
		$plugins = array_keys( $plugins->response );

foreach ( $plugins as $plugin_file ) {
			add_action( "after_plugin_row_{$plugin_file}", 'wp_plugin_update_row', 10, 2 );
		}
	}
}

/**
 * Displays update information for a plugin.
 *
 * @since 2.3.0
 *
 * @param string $file        Plugin basename.
 * @param array  $plugin_data Plugin information.
 * @return void|false
 */
function wp_plugin_update_row( $file, $plugin_data ) {
	$current = get_site_transient( 'update_plugins' );

if ( ! isset( $current->response[ $file ] ) ) {
		return false;
	}

$response = $current->response[ $file ];

$plugins_allowedtags = array(
		'a'       => array(
			'href'  => array(),
			'title' => array(),
		),
		'abbr'    => array( 'title' => array() ),
		'acronym' => array( 'title' => array() ),
		'code'    => array(),
		'em'      => array(),
		'strong'  => array(),
	);

$plugin_name = wp_kses( $plugin_data['Name'], $plugins_allowedtags );
	$plugin_slug = isset( $response->slug ) ? $response->slug : $response->id;

if ( isset( $response->slug ) ) {
		$details_url = self_admin_url( 'plugin-install.php?tab=plugin-information&plugin=' . $plugin_slug . '&section=changelog' );
	} elseif ( isset( $response->url ) ) {
		$details_url = $response->url;
	} else {
		$details_url = $plugin_data['PluginURI'];
	}

$details_url = add_query_arg(
		array(
			'TB_iframe' => 'true',
			'width'     => 600,
			'height'    => 800,
		),
		$details_url
	);

/** @var WP_Plugins_List_Table $wp_list_table */
	$wp_list_table = _get_list_table(
		'WP_Plugins_List_Table',
		array(
			'screen' => get_current_screen(),
		)
	);

if ( is_network_admin() || ! is_multisite() ) {
		if ( is_network_admin() ) {
			$active_class = is_plugin_active_for_network( $file ) ? ' active' : '';
		} else {
			$active_class = is_plugin_active( $file ) ? ' active' : '';
		}

$requires_php   = isset( $response->requires_php ) ? $response->requires_php : null;
		$compatible_php = is_php_version_compatible( $requires_php );
		$notice_type    = $compatible_php ? 'notice-warning' : 'notice-error';

printf(
			'<tr class="plugin-update-tr%s" id="%s" data-slug="%s" data-plugin="%s">' .
			'<td colspan="%s" class="plugin-update colspanchange">' .
			'<div class="update-message notice inline %s notice-alt">',
			$active_class,
			esc_attr( $plugin_slug . '-update' ),
			esc_attr( $plugin_slug ),
			esc_attr( $file ),
			esc_attr( $wp_list_table->get_column_count() ),
			$notice_type
		);

if ( ! current_user_can( 'update_plugins' ) ) {
			printf(
				/* translators: 1: Plugin name, 2: Details URL, 3: Additional link attributes, 4: Version number. */
				__( 'There is a new version of %1$s available. <a href="%2$s" %3$s>View version %4$s details</a>.' ),
				$plugin_name,
				esc_url( $details_url ),
				sprintf(
					'class="thickbox open-plugin-details-modal" aria-label="%s"',
					/* translators: 1: Plugin name, 2: Version number. */
					esc_attr( sprintf( __( 'View %1$s version %2$s details' ), $plugin_name, $response->new_version ) )
				),
				esc_attr( $response->new_version )
			);
		} elseif ( empty( $response->package ) ) {
			printf(
				/* translators: 1: Plugin name, 2: Details URL, 3: Additional link attributes, 4: Version number. */
				__( 'There is a new version of %1$s available. <a href="%2$s" %3$s>View version %4$s details</a>. Automatic update is unavailable for this plugin.' ),
				$plugin_name,
				esc_url( $details_url ),
				sprintf(
					'class="thickbox open-plugin-details-modal" aria-label="%s"',
					/* translators: 1: Plugin name, 2: Version number. */
					esc_attr( sprintf( __( 'View %1$s version %2$s details' ), $plugin_name, $response->new_version ) )
				),
				esc_attr( $response->new_version )
			);
		} else {
			if ( $compatible_php ) {
				printf(
					/* translators: 1: Plugin name, 2: Details URL, 3: Additional link attributes, 4: Version number, 5: Update URL, 6: Additional link attributes. */
					__( 'There is a new version of %1$s available. <a href="%2$s" %3$s>View version %4$s details</a> or <a href="%5$s" %6$s>update now</a>.' ),
					$plugin_name,
					esc_url( $details_url ),
					sprintf(
						'class="thickbox open-plugin-details-modal" aria-label="%s"',
						/* translators: 1: Plugin name, 2: Version number. */
						esc_attr( sprintf( __( 'View %1$s version %2$s details' ), $plugin_name, $response->new_version ) )
					),
					esc_attr( $response->new_version ),
					wp_nonce_url( self_admin_url( 'update.php?action=upgrade-plugin&plugin=' ) . $file, 'upgrade-plugin_' . $file ),
					sprintf(
						'class="update-link" aria-label="%s"',
						/* translators: %s: Plugin name. */
						esc_attr( sprintf( _x( 'Update %s now', 'plugin' ), $plugin_name ) )
					)
				);
			} else {
				printf(
					/* translators: 1: Plugin name, 2: Details URL, 3: Additional link attributes, 4: Version number 5: URL to Update PHP page. */
					__( 'There is a new version of %1$s available, but it does not work with your version of PHP. <a href="%2$s" %3$s>View version %4$s details</a> or <a href="%5$s">learn more about updating PHP</a>.' ),
					$plugin_name,
					esc_url( $details_url ),
					sprintf(
						'class="thickbox open-plugin-details-modal" aria-label="%s"',
						/* translators: 1: Plugin name, 2: Version number. */
						esc_attr( sprintf( __( 'View %1$s version %2$s details' ), $plugin_name, $response->new_version ) )
					),
					esc_at