<?php

// Do not allow the file to be called directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * This class is used to upload the local logs to our API so it can
 * be shown on the app.
 */
class P_Upload extends P_Core {

	/**
	 * Add the actions required to upload logs to our API.
	 *
	 * @param Patchstack $core
	 * @return void
	 */
	public function __construct( $core ) {
		parent::__construct( $core );

		// In case the software has never been synchronized, force it.
		if ( ! get_option( 'patchstack_software_data_hash', false ) ) {
			$this->upload_software();
		}

		// Register the actions.
		add_action( 'patchstack_send_software_data', array( $this, 'upload_software' ) );
		add_action( 'patchstack_send_hacker_logs', array( $this, 'upload_firewall_logs' ) );
		add_action( 'patchstack_send_event_logs', array( $this, 'upload_activity_logs' ) );

		// In case a plugin or upgrade has been performed, re-synchronize with the app.
		add_action( 'activated_plugin', array( $this, 'upload_software' ) );
		add_action( 'deactivated_plugin', array( $this, 'upload_software' ) );
		add_action( 'upgrader_process_complete', array( $this, 'upload_software' ) );
		add_action( '_core_updated_successfully', array( &$this, 'upload_software' ) );
	}

	/**
	 * Synchronize the software data with our API.
	 * This includes plugins, themes, WordPress and PHP version.
	 *
	 * @return void|array
	 */
	public function upload_software() {
		// Get the software data and hash.
		$data = $this->get_software_data();
		$hash = sha1( json_encode( $data ) );
		if ( ! isset( $_POST['webarx_secret'] ) && get_option( 'patchstack_software_data_hash', false ) === $hash ) {
			return;
		}

		// Synchronize the software list with the API.
		$results = $this->plugin->api->upload_software( array( 'software' => json_encode( $data ) ) );
		if ( isset( $results['success'] ) ) {
			update_option( 'patchstack_software_data_hash', $hash );

			// The result will also contain a list of all vulnerable plugins on the site that is returned by the API.
			// If the auto update setting is enabled for vulnerable plugins, perform the update once the 15 minute
			// scheduled task "patchstack_update_plugins" is executed.
			$update = get_site_option( 'patchstack_auto_update', array() );
			if ( isset( $results['vulnerable'] ) && is_array( $update ) && in_array( 'vulnerable', $update ) ) {
				update_site_option( 'patchstack_vulnerable_plugins', $results['vulnerable'] );
			}

			return $results;
		}

		return;
	}

	/**
	 * Synchronize the firewall logs with our API.
	 *
	 * @return void
	 */
	public function upload_firewall_logs() {
		global $wpdb;
		$lastid = get_option( 'patchstack_firewall_log_lastid', 0, true );
		$items  = $wpdb->get_results( $wpdb->prepare( 'SELECT ip, log_date, request_uri, user_agent, fid, method, post_data FROM ' . $wpdb->prefix . 'patchstack_firewall_log WHERE id > %d ORDER BY id', $lastid ) );

		// No need to synchronize if there are no new logs present.
		if ( $wpdb->num_rows == 0 ) {
			return;
		}

		// Construct the array to be uploaded to our API.
		$logs = array();
		foreach ( $items as $item ) {

			// Entries that we don't want to store on the API side.
			if ( stripos( $item->request_uri, 'wp-comments-post' ) !== false ) {
				continue;
			}

			// Push to entries to be uploaded.
			$logs[] = array(
				'ip'          => $item->ip,
				'fid'         => $item->fid,
				'request_uri' => $item->request_uri,
				'user_agent'  => $item->user_agent,
				'method'      => $item->method,
				'log_date'    => $item->log_date,
				'post_data'   => $item->post_data,
			);
		}

		// JSON encode the logs and upload.
		$logs    = json_encode( $logs );
		$results = $this->plugin->api->upload_firewall_logs(
			array(
				'logs' => $logs,
				'type' => 'firewall',
			)
		);
		if ( isset( $results['errors'] ) ) {
			return;
		}

		// Get the most recent id of the logs.
		$lastid = $wpdb->get_var( 'SELECT id FROM ' . $wpdb->prefix . 'patchstack_firewall_log ORDER BY id DESC LIMIT 0, 1' );
		update_option( 'patchstack_firewall_log_lastid', $lastid );

		// Delete logs that are older than 2 weeks.
		$wpdb->query( 'DELETE FROM ' . $wpdb->prefix . 'patchstack_firewall_log WHERE log_date < DATE_SUB(NOW(), INTERVAL 14 DAY)' );
	}

	/**
	 * Synchronize the activity logs with our API.
	 *
	 * @return void
	 */
	public function upload_activity_logs() {
		global $wpdb;

		// Determine if we should upload failed logins to the app.
		$where = " AND action != 'failed login' ";
		if ( $this->get_option( 'patchstack_activity_log_failed_logins_db', 0 ) == 1 ) {
			$where = ' ';
		}

		// Do we have data to upload?
		$lastid = get_option( 'patchstack_eventlog_lastid', 0 );
		$items  = $wpdb->get_results( $wpdb->prepare( 'SELECT author, ip, object, object_id, object_name, action, date FROM ' . $wpdb->prefix . 'patchstack_event_log WHERE id > %d' . $where . 'ORDER BY id', array( $lastid ) ) );
		if ( $wpdb->num_rows == 0 ) {
			return;
		}

		// Send to the API.
		$logs    = json_encode( $items );
		$results = $this->plugin->api->upload_activity_logs( array( 'logs' => $logs ) );
		if ( isset( $results['errors'] ) ) {
			return;
		}

		// Get the most recent id of the logs.
		$lastid = $wpdb->get_var( 'SELECT id FROM ' . $wpdb->prefix . 'patchstack_event_log ORDER BY id DESC LIMIT 0, 1' );
		update_option( 'patchstack_eventlog_lastid', $lastid );

		// Delete logs that are older than 2 weeks.
		$wpdb->query( 'DELETE FROM ' . $wpdb->prefix . 'patchstack_event_log WHERE date < DATE_SUB(NOW(), INTERVAL 14 DAY)' );
	}

	/**
	 * Obtain information about the software that the user has installed.
	 * This includes plugins, themes, WordPress and PHP version.
	 *
	 * @return array
	 */
	public function get_software_data() {
		if ( ! function_exists( 'get_plugins' ) ) {
			require_once ABSPATH . 'wp-admin/includes/plugin.php';
		}
		if ( ! function_exists( 'get_plugin_updates' ) ) {
			require_once ABSPATH . 'wp-admin/includes/update.php';
		}

		// Refetch updates data if we are performing a plugin listener related action.
		if ( isset( $_POST['webarx_secret'] ) ) {
			@require_once ABSPATH . 'wp-includes/update.php';
			@wp_update_themes();
			@wp_update_plugins();
		}

		// Fetch list of plugins.
		$all_plugin        = get_plugins();
		$installed_plugins = array_keys( $all_plugin );
		$updatable_plugins = get_plugin_updates();
		$software_list     = array();

		foreach ( $installed_plugins as $plugin ) {
			if ( ! file_exists( WP_PLUGIN_DIR . '/' . $plugin ) ) {
				continue;
			}

			$plugin_data    = get_plugin_data( WP_PLUGIN_DIR . '/' . $plugin );
			$new_version    = empty( $updatable_plugins[ $plugin ]->update->new_version ) ? '' : $updatable_plugins[ $plugin ]->update->new_version;
			$plugin_name    = empty( $plugin_data['Name'] ) ? '' : $plugin_data['Name'];
			$plugin_version = empty( $plugin_data['Version'] ) ? '' : $plugin_data['Version'];

			if ( ! empty( $plugin_name ) && ! empty( $plugin_version ) ) {
				$software_list[] = array(
					'sw_type'    => 'plugin',
					'sw_name'    => $plugin_name,
					'sw_cur_ver' => $plugin_version,
					'sw_new_ver' => $new_version,
					'sw_key'     => $plugin,
					'sw_active'  => is_plugin_active( $plugin ),
				);
			}
		}

		// Fetch list of themes.
		$themes           = wp_get_themes();
		$themes_keys      = array_keys( $themes );
		$updatable_themes = get_theme_updates();

		foreach ( $themes_keys as $theme_key ) {
			$themes_data       = $themes[ $theme_key ];
			$theme_temporary   = empty( $updatable_themes[ $theme_key ] ) ? '' : $updatable_themes[ $theme_key ];
			$theme_new_version = empty( $updatable_themes[ $theme_key ] ) || ! isset( $theme_temporary->update, $theme_temporary->update['new_version'] ) ? '' : $theme_temporary->update['new_version'];
			$theme_name        = $themes_data->get( 'Name' );
			$theme_version     = $themes_data->get( 'Version' );

			if ( ! empty( $theme_name ) && ! empty( $theme_version ) ) {
				$software_list[] = array(
					'sw_type'    => 'theme',
					'sw_name'    => $theme_name,
					'sw_cur_ver' => $theme_version,
					'sw_new_ver' => $theme_new_version,
					'sw_key'     => $theme_key,
				);
			}
		}

		// Fetch WordPress version.
		global $wp_version;
		$core_updates    = get_core_updates();
		$new_wp_version  = ( ! empty( $core_updates ) && $core_updates[0]->response == 'upgrade' ) ? $core_updates[0]->version : '';
		$software_list[] = array(
			'sw_type'    => 'wordpress',
			'sw_name'    => 'WordPress',
			'sw_cur_ver' => $wp_version,
			'sw_new_ver' => $new_wp_version,
		);

		// Fetch PHP version.
		$software_list[] = array(
			'sw_type'    => 'php',
			'sw_name'    => 'PHP',
			'sw_cur_ver' => substr( phpversion(), 0, 5 ),
			'sw_new_ver' => '',
		);

		return $software_list;
	}
}