<?php

/*
Provides an easy to use interface for communicating with the iThemes updater server.
Written by Chris Jean for iThemes.com
Version 1.1.0

Version History
	1.0.0 - 2013-04-11 - Chris Jean
		Release ready
	1.0.1 - 2013-06-21 - Chris Jean
		Updated the http_build_query call to force a separator of & in order to avoid issues with servers that change the arg_separator.output php.ini value.
	1.0.2 - 2013-09-19 - Chris Jean
		Updated ithemes-updater-object to ithemes-updater-settings.
	1.0.3 - 2013-12-18 - Chris Jean
		Updated the way that the site URL is generated to ensure consistency across multisite sites.
	1.0.4 - 2014-01-31 - Chris Jean
		Updated to normalize the site URL used for password hash generation and for sending to the server.
	1.1.0 - 2014-10-23 - Chris Jean
		Updated auth token generation to use new password hashing.
		Added CA patch code.
		Updated code to meet WordPress coding standards.
*/


class Ithemes_Updater_Server {
	private static $secure_server_url = 'https://api.ithemes.com/updater';
	private static $insecure_server_url = 'http://api.ithemes.com/updater';
	
	private static $password_iterations = 8;
	
	
	public static function activate_package( $username, $password, $packages ) {
		$query = array(
			'user' => $username
		);
		
		$data = array(
			'auth_token' => self::get_password_hash( $username, $password ),
			'packages'   => $packages,
		);
		
		return Ithemes_Updater_Server::request( 'package-activate', $query, $data );
	}
	
	public static function deactivate_package( $username, $password, $packages ) {
		$query = array(
			'user' => $username
		);
		
		$data = array(
			'auth_token' => self::get_password_hash( $username, $password ),
			'packages'   => $packages,
		);
		
		return Ithemes_Updater_Server::request( 'package-deactivate', $query, $data );
	}
	
	public static function get_package_details( $packages ) {
		$query = array();
		
		$data = array(
			'packages' => $packages
		);
		
		return Ithemes_Updater_Server::request( 'package-details', $query, $data );
	}
	
	public static function request( $action, $query = array(), $data = array() ) {
		if ( false !== ( $timeout_start = get_site_option( 'ithemes-updater-server-timed-out' ) ) ) {
			// Hold off updates for 30 minutes.
			$time_remaining = 1800 - ( time() - $timeout_start );
			$minutes_remaining = ceil( $time_remaining / 60 );
			
			if ( $time_remaining < 0 ) {
				delete_site_option( 'ithemes-updater-server-timed-out' );
			} else {
				return new WP_Error( 'ithemes-updater-timed-out-server', sprintf( _n( 'The server could not be contacted. Requests are delayed for %d minute to allow the server to recover.', 'The server could not be contacted. Requests are delayed for %d minutes to allow the server to recover.', $minutes_remaining, 'it-l10n-backupbuddy' ), $minutes_remaining ) );
			}
		}
		
		
		if ( isset( $data['auth_token'] ) ) {
			$data['iterations'] = self::$password_iterations;
		}
		
		
		$site_url = self::get_site_url();
		
		
		$default_query = array(
			'wp'           => $GLOBALS['wp_version'],
			'site'         => $site_url,
			'timestamp'    => time(),
			'auth_version' => '2',
		);
		
		if ( is_multisite() ) {
			$default_query['ms'] = 1;
		}
		
		$query = array_merge( $default_query, $query );
		$request = "/$action/?" . http_build_query( $query, '', '&' );
		
		$post_data = array(
			'request' => json_encode( $data ),
		);
		
		$remote_post_args = array(
			'timeout' => 10,
			'body'    => $post_data,
		);
		
		
		$options = array(
			'use_ca_patch' => false,
			'use_ssl'      => true,
		);
		
		$patch_enabled = $GLOBALS['ithemes-updater-settings']->get_option( 'use_ca_patch' );
		
		if ( $patch_enabled ) {
			self::disable_ssl_ca_patch();
		}
		
		
		$response = wp_remote_post( self::$secure_server_url . $request, $remote_post_args );
		
		if ( is_wp_error( $response ) && ( 'connect() timed out!' != $response->get_error_message() ) ) {
			self::enable_ssl_ca_patch();
			$response = wp_remote_post( self::$secure_server_url . $request, $remote_post_args );
			
			if ( ! is_wp_error( $response ) ) {
				$options['use_ca_patch'] = true;
			}
		}
		
		if ( is_wp_error( $response ) && ( 'connect() timed out!' != $response->get_error_message() ) ) {
			$response = wp_remote_post( self::$insecure_server_url . $request, $remote_post_args );
			
			$options['use_ssl'] = false;
		}
		
		if ( ! $options['use_ca_patch'] ) {
			self::disable_ssl_ca_patch();
		}
		
		$GLOBALS['ithemes-updater-settings']->update_options( $options );
		
		if ( is_wp_error( $response ) ) {
			if ( 'connect() timed out!' == $response->get_error_message() ) {
				// Set option to delay server checks for a period of time.
				update_site_option( 'ithemes-updater-server-timed-out', time() );
				
				return new WP_Error( 'http_request_failed', __( 'The server was unable to be contacted.', 'it-l10n-backupbuddy' ) );
			}
			
			return $response;
		}
		
		
		$body = json_decode( $response['body'], true );
		
		if ( ! empty( $body['error'] ) ) {
			return new WP_Error( $body['error']['type'], sprintf( __( 'An error occurred when communicating with the iThemes update server: %s (%s)', 'it-l10n-backupbuddy' ), $body['error']['message'], $body['error']['code'] ) );
		}
		
		
		return $body;
	}
	
	private static function get_site_url() {
		if ( is_callable( 'network_home_url' ) ) {
			$site_url = network_home_url();
		} else {
			$site_url = get_bloginfo( 'url' );
		}
		
		$site_url = preg_replace( '/^https/', 'http', $site_url );
		$site_url = preg_replace( '|/$|', '', $site_url );
		
		return $site_url;
	}
	
	private static function get_password_hash( $username, $password ) {
		require_once( ABSPATH . 'wp-includes/class-phpass.php' );
		require_once( dirname( __FILE__ ) . '/class-ithemes-credentials.php' );
		
		$password = iThemes_Credentials::get_password_hash( $username, $password );
		
		$salted_password = $password . $username . self::get_site_url() . $GLOBALS['wp_version'];
		$salted_password = substr( $salted_password, 0, max( strlen( $password ), 512 ) );
		
		$hasher = new PasswordHash( self::$password_iterations, true );
		$auth_token = $hasher->HashPassword( $salted_password );
		
		return $auth_token;
	}
	
	public static function enable_ssl_ca_patch() {
		add_action( 'http_api_curl', array( __CLASS__, 'add_ca_patch_to_curl_opts' ) );
	}
	
	public static function disable_ssl_ca_patch() {
		remove_action( 'http_api_curl', array( __CLASS__, 'add_ca_patch_to_curl_opts' ) );
	}
	
	public static function add_ca_patch_to_curl_opts( $handle ) {
		$url = curl_getinfo( $handle, CURLINFO_EFFECTIVE_URL );
		
		if ( ! preg_match( '{^https://(api|downloads)\.ithemes\.com}', $url ) ) {
			return;
		}
		
		curl_setopt( $handle, CURLOPT_CAINFO, $GLOBALS['ithemes_updater_path'] . '/ca/roots.crt' );
	}
}
