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<?php
namespace AIOSEO\Plugin\Common\Sitemap;

// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

use AIOSEO\Plugin\Common\Models;

/**
 * Handles our sitemaps.
 *
 * @since 4.0.0
 */
class Sitemap {
	/**
	 * Holds all active addons and their classes.
	 *
	 * @since 4.0.0
	 *
	 * @var array
	 */
	public $addons = [];

/**
	 * Class constructor.
	 *
	 * @since 4.0.0
	 */
	public function __construct() {
		$this->content  = new Content();
		$this->root     = new Root();
		$this->query    = new Query();
		$this->file     = new File();
		$this->image    = new Image();
		$this->ping     = new Ping();
		$this->priority = new Priority();
		$this->output   = new Output();
		$this->helpers  = new Helpers();

// Disables the built-in WP sitemap.
		if ( aioseo()->options->sitemap->general->enable ) {
			remove_action( 'init', 'wp_sitemaps_get_server' );
			add_filter( 'wp_sitemaps_enabled', '__return_false' );
		}

add_action( 'aioseo_static_sitemap_regeneration', [ $this, 'regenerateStaticSitemap' ] );
	}

/**
	 * Adds our hooks.
	 *
	 * @since 4.0.0
	 *
	 * @return void
	 */
	public function init() {
		// Watch for XSL requests.
		add_action( 'wp_loaded', [ $this, 'xsl' ] );

// Add rewrite rules.
		$class = new \ReflectionClass( new Rewrite );
		add_action( 'wp_loaded', [ $class->getName(), 'updateRewriteRules' ] );

// Remove trailing slash if the sitemap is requested.
		add_filter( 'redirect_canonical', [ $this, 'untrailUrl' ], 10, 2 );

// Parse the request to see if the sitemap should be returned.
		// This doesn't run if a static file is requested.
		add_filter( 'query_vars', [ $this, 'addWhitelistParams' ] );
		add_action( 'template_redirect', [ $this, 'checkUrlParams' ], 10, 1 );

// Check if static files need to be updated.
		add_action( 'wp_insert_post', [ $this, 'regenerateOnUpdate' ] );
		add_action( 'edited_term', [ $this, 'regenerateStaticSitemap' ] );

add_action( 'admin_init', [ $this, 'detectStatic' ] );
	}

/**
	 * Checks if static sitemap files prevent dynamic sitemap generation.
	 *
	 * @since 4.0.0
	 *
	 * @return void
	 */
	public function detectStatic() {
		$isGeneralSitemapStatic = aioseo()->options->sitemap->general->advancedSettings->enable &&
			in_array( 'staticSitemap', aioseo()->internalOptions->internal->deprecatedOptions, true ) &&
			! aioseo()->options->deprecated->sitemap->general->advancedSettings->dynamic;

if ( $isGeneralSitemapStatic ) {
			Models\Notification::deleteNotificationByName( 'sitemap-static-files' );
			return;
		}

require_once( ABSPATH . 'wp-admin/includes/file.php' );
		$files = list_files( get_home_path(), 1 );
		if ( ! count( $files ) ) {
			return;
		}

$detectedFiles = [];
		if ( ! $isGeneralSitemapStatic ) {
			foreach ( $files as $index => $filename ) {
				if ( preg_match( '#.*sitemap.*#', $filename ) ) {
					// We don't want to delete the video sitemap here at all.
					$isVideoSitemap = preg_match( '#.*video.*#', $filename ) ? true : false;
					if ( ! $isVideoSitemap ) {
						$detectedFiles[] = $filename;
					}
				}
			}
		}

$this->maybeShowStaticSitemapNotification( $detectedFiles );
	}

/**
	 * If there are files, show a notice, otherwise delete it.
	 *
	 * @since 4.0.0
	 *
	 * @param  array $detectedFiles An array of detected files.
	 * @return void
	 */
	protected function maybeShowStaticSitemapNotification( $detectedFiles ) {
		if ( ! count( $detectedFiles ) ) {
			Models\Notification::deleteNotificationByName( 'sitemap-static-files' );
			return;
		}

$notification = Models\Notification::getNotificationByName( 'sitemap-static-files' );
		if ( $notification->notification_name ) {
			return;
		}

Models\Notification::addNotification( [
			'slug'              => uniqid(),
			'notification_name' => 'sitemap-static-files',
			'title'             => __( 'Static sitemap files detected', 'all-in-one-seo-pack' ),
			'content'           => sprintf(
				// Translators: 1 - The plugin short name ("AIOSEO"), 2 - Same as previous.
				__( '%1$s has detected static sitemap files in the root folder of your WordPress installation.
				As long as these files are present, %2$s is not able to dynamically generate your sitemap.', 'all-in-one-seo-pack' ),
				AIOSEO_PLUGIN_SHORT_NAME,
				AIOSEO_PLUGIN_SHORT_NAME
			),
			'type'              => 'error',
			'level'             => [ 'all' ],
			'button1_label'     => __( 'Delete Static Files', 'all-in-one-seo-pack' ),
			'button1_action'    => 'http://action#sitemap/delete-static-files',
			'start'             => gmdate( 'Y-m-d H:i:s' )
		] );
	}

/**
	 * Regenerates the static sitemap files when a post is updated.
	 *
	 * @since 4.0.0
	 *
	 * @param  integer $postId The post ID.
	 * @return void
	 */
	public function regenerateOnUpdate( $postId ) {
		if ( aioseo()->helpers->isValidPost( $postId ) ) {
			$this->scheduleRegeneration();
		}
	}

/**
	 * Schedules an action to regenerate the static sitemap files.
	 *
	 * @since 4.0.5
	 *
	 * @return void
	 */
	public function scheduleRegeneration() {
		try {
			if (
				! aioseo()->options->deprecated->sitemap->general->advancedSettings->dynamic &&
				! as_next_scheduled_action( 'aioseo_static_sitemap_regeneration' )
			) {
				as_schedule_single_action( time() + 60, 'aioseo_static_sitemap_regeneration', [], 'aioseo' );
			}
		} catch ( \Exception $e ) {
			// Do nothing.
		}
	}

/**
	 * Regenerates the static sitemap files.
	 *
	 * @since 4.0.5
	 *
	 * @return void
	 */
	public function regenerateStaticSitemap() {
		aioseo()->sitemap->file->generate();
	}

/**
	 * Removes the trailing slash from the redirect URL.
	 *
	 * @since 4.0.0
	 *
	 * @param  string $redirect The redirect URL.
	 * @param  string $request  The requested URL.
	 * @return string           Either the original requested URL for the sitemap or the redirect URL.
	 */
	public function untrailUrl( $redirect, $request ) {
		if ( preg_match( '#(.*sitemap[0-9]*?.xml|.*sitemap[0-9]*?.xml.gz|.*sitemap.rss)$#i', $request ) ) {
			return $request;
		}
		return $redirect;
	}

/**
	 * Adds our sitemap params to the query vars whitelist.
	 *
	 * @since 4.0.0
	 *
	 * @param  array $params The array of whitelisted query variable names.
	 * @return array $params The filtered array of whitelisted query variable names.
	 */
	public function addWhitelistParams( $params ) {
		$params[] = 'aiosp_sitemap_path';
		if ( aioseo()->options->sitemap->general->indexes && ! isset( $params['aiosp_sitemap_page'] ) ) {
			$params[] = 'aiosp_sitemap_page';
		}

foreach ( $this->addons as $addon => $classes ) {
			if ( ! empty( $classes['sitemap'] ) ) {
				$params = $classes['sitemap']->addWhitelistParams( $params );
			}
		}
		return $params;
	}

/**
	 * Checks whether one of our sitemaps is being requested.
	 *
	 * @since 4.0.0
	 *
	 * @return void
	 */
	public function checkUrlParams() {
		global $wp_query;
		if ( ! empty( $wp_query->query_vars['aiosp_sitemap_path'] ) ) {
			$this->generate();
		}
	}

/**
	 * Generates the requested sitemap.
	 *
	 * @since 4.0.0
	 *
	 * @return void
	 */
	private function generate() {
		// This is a hack to prevent WordPress from running it's default stuff during our processing.
		global $wp_query;
		$wp_query->is_home = false;

if ( isset( $_GET['aioseo-dev'] ) ) {
			aioseo()->sitemap->helpers->logPerformance();
		}

// Sets context class properties.
		$this->determineContext();
		// If requested sitemap should be static and doesn't exist, then generate it.
		// We'll then serve it dynamically for the current request so that we don't serve a blank page.
		$this->doesFileExist();

$entries = aioseo()->sitemap->content->get();
		if ( ! $entries ) {
			foreach ( $this->addons as $addon => $classes ) {
				if ( ! empty( $classes['content'] ) ) {
					$entries = $classes['content']->get();
					if ( $entries ) {
						break;
					}
				}
			}
		}

if ( ! $entries ) {
			return $this->notFoundPage();
		}

$this->headers();
		aioseo()->sitemap->output->output( $entries );
		foreach ( $this->addons as $addon => $classes ) {
			if ( ! empty( $classes['output'] ) ) {
				$classes['output']->output( $entries );
			}
		}

if ( isset( $_GET['aioseo-dev'] ) ) {
			aioseo()->sitemap->helpers->logPerformance();
		}
		exit();
	}

/**
	 * Determines the current sitemap context.
	 *
	 * @since 4.0.0
	 *
	 * @return void
	 */
	protected function determineContext() {
		global $wp_query;
		$this->type          = 'rss' === $wp_query->query_vars['aiosp_sitemap_path'] ? 'rss' : 'general';
		$this->filename      = 'sitemap';
		$this->indexName     = $wp_query->query_vars['aiosp_sitemap_path'];
		$this->pageNumber    = ! empty( $wp_query->query_vars['aiosp_sitemap_page'] ) ? $wp_query->query_vars['aiosp_sitemap_page'] - 1 : 0;
		$this->indexes       = aioseo()->options->sitemap->general->indexes;
		$this->linksPerIndex = aioseo()->options->sitemap->{$this->type}->linksPerIndex;
		$this->offset        = $this->linksPerIndex * $this->pageNumber;
		// The sitemap isn't statically generated if we get here.
		$this->isStatic = false;

foreach ( $this->addons as $addon => $classes ) {
			if ( ! empty( $classes['sitemap'] ) ) {
				$classes['sitemap']->determineContext();
			}
		}

if ( $this->linksPerIndex > 50000 ) {
			$this->linksPerIndex = 50000;
		}
	}

/**
	 * Checks if static file should be served and generates it if it doesn't exist.
	 *
	 * This essentially acts as a safety net in case a file doesn't exist yet or has been deleted.
	 *
	 * @since 4.0.0
	 *
	 * @return void
	 */
	protected function doesFileExist() {
		foreach ( $this->addons as $addon => $classes ) {
			if ( ! empty( $classes['sitemap'] ) ) {
				$classes['sitemap']->doesFileExist();
			}
		}

if (
			'general' !== $this->type ||
			! aioseo()->options->sitemap->general->advancedSettings->enable ||
			! in_array( 'staticSitemap', aioseo()->internalOptions->internal->deprecatedOptions, true ) ||
			aioseo()->options->sitemap->general->advancedSettings->dynamic
		) {
			return;
		}

require_once( ABSPATH . 'wp-admin/includes/file.php' );
		if ( ! file_exists( get_home_path() . $_SERVER['REQUEST_URI'] ) ) {
			$this->scheduleRegeneration();
		}
	}

/**
	 * Sets the HTTP headers for the sitemap.
	 *
	 * @since 4.0.0
	 *
	 * @return void
	 */
	public function headers() {
		$charset = get_option( 'blog_charset' );
		header( "Content-Type: text/xml; charset=$charset", true );
		header( 'X-Robots-Tag: noindex, follow', true );
	}

/**
	 * Redirects to a 404 Not Found page if the sitemap is empty or disabled.
	 *
	 * @since 4.0.0
	 *
	 * @return void
	 */
	public function notFoundPage() {
		global $wp_query;
		$wp_query->set_404();
		status_header( 404 );
		include( get_404_template() );
		exit();
	}

/**
	 * Returns the sitemap stylesheet.
	 *
	 * @since 4.0.0
	 *
	 * @return void
	 */
	public function xsl() {
		if ( preg_match( '#(/default\.xsl)$#i', $_SERVER['REQUEST_URI'] ) ) {
			$this->headers();
			$charset = get_option( 'blog_charset' );
			// phpcs:disable VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable
			$advanced      = aioseo()->options->sitemap->general->advancedSettings->enable;
			$excludeImages = aioseo()->options->sitemap->general->advancedSettings->excludeImages;
			// phpcs:enable VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable

echo '<?xml version="1.0" encoding="' . esc_attr( $charset ) . '"?>';
			include_once( AIOSEO_DIR . '/app/Common/Views/sitemap/xsl/default.php' );
			exit;
		}

foreach ( $this->addons as $addon => $classes ) {
			if ( ! empty( $classes['sitemap'] ) ) {
				$classes['sitemap']->xsl();
			}
		}
	}

/**
	 * Registers an active sitemap addon and its classes.
	 *
	 * @since 4.0.0
	 *
	 * @return void
	 */
	public function addAddon( $name, $classes ) {
		$this->addons[ $name ] = $classes;
	}
}