<?php
/*********************************************************************************
 *
 * TimeTrex is a Workforce Management program developed by
 * TimeTrex Software Inc. Copyright (C) 2003 - 2021 TimeTrex Software Inc.
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Affero General Public License version 3 as published by
 * the Free Software Foundation with the addition of the following permission
 * added to Section 15 as permitted in Section 7(a): FOR ANY PART OF THE COVERED
 * WORK IN WHICH THE COPYRIGHT IS OWNED BY TIMETREX, TIMETREX DISCLAIMS THE
 * WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
 * details.
 *
 *
 * You should have received a copy of the GNU Affero General Public License along
 * with this program; if not, see http://www.gnu.org/licenses or write to the Free
 * Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 *
 *
 * You can contact TimeTrex headquarters at Unit 22 - 2475 Dobbin Rd. Suite
 * #292 West Kelowna, BC V4T 2E9, Canada or at email address info@timetrex.com.
 *
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License version 3.
 *
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License
 * version 3, these Appropriate Legal Notices must retain the display of the
 * "Powered by TimeTrex" logo. If the display of the logo is not reasonably
 * feasible for technical reasons, the Appropriate Legal Notices must display
 * the words "Powered by TimeTrex".
 *
 ********************************************************************************/

define( 'TIMETREX_API', true );
forceNoCacheHeaders(); //Send headers to disable caching.

/**
 * Returns if the method should always be a unauthenticated API call.
 * @return bool
 */
function isUnauthenticatedMethod( $method ) {
	if ( in_array( strtolower( $method ), [ 'isloggedin', 'sendcsrftokencookie', 'senderrorreport', 'getprogressbar', 'ping' ] ) ) {
		return true;
	}

	return false;
}

/**
 * Returns valid classes when unauthenticated.
 * @return array
 */
function getUnauthenticatedAPIClasses() {
	return [ 'APIAuthentication', 'APIJobApplicantPortal', 'APIRecruitmentAuthentication', 'APIJobVacancyPortal', 'APIDocumentPortal', 'APIClientStationUnAuthenticated', 'APIAuthenticationPlugin', 'APIClientStationUnAuthenticatedPlugin', 'APICompanyPortal', 'APIProgressBar', 'APIInstall' ];
}

/**
 * @return array
 */
function getAuthenticatedPortalAPIClasses() {
	//Since we have isWhiteListedAPICall() now that ensures only child methods can be called from the API, we just need to whitelist the classes and don't need to bother with methods.
	return [
			'APICompanyPortal', 'APICurrencyPortal', 'APIDocumentPortal', 'APIEthnicGroupPortal', 'APIJobVacancyPortal', 'APIQualificationPortal', 'APIRecruitmentAuthentication'
	];
}

/**
 * @return array
 */
function getAuthenticatedPortalAPIMethods() {
	return [
			'getJobApplicant', 'getJobApplicantEducation', 'setJobApplicantEducation', 'getJobApplicantEmployment', 'setJobApplicantEmployment', 'getJobApplicantLanguage', 'setJobApplicantLanguage', 'getJobApplicantLicense', 'setJobApplicantLicense', 'getJobApplicantLocation', 'setJobApplicantLocation', 'getJobApplicantMembership', 'setJobApplicantMembership',
			'getJobApplicantReference', 'setJobApplicantReference', 'getJobApplicantSkill', 'setJobApplicantSkill', 'getJobApplication', 'setJobApplication', 'getAttachment', 'addAttachment', 'uploadAttachment',
	];
}

/**
 * Make sure the remote API calls can only call the child methods of a class, and not the inherited parent methods, unless they are whitelisted in APIFactory.class.php
 * @param object $obj Object
 * @param string $method Method
 * @return bool
 */
function isWhiteListedAPICall( $obj, $method ) {
	if ( !is_object( $obj ) ) {
		Debug::text( 'ERROR: Object not specified!', __FILE__, __LINE__, __METHOD__, 10 );
		return false;
	}

	if ( empty( $method ) ) {
		Debug::text( 'ERROR: Method is empty! Object: ' . get_class( $obj ), __FILE__, __LINE__, __METHOD__, 10 );
		return false;
	}

	$api_factory_whitelisted_methods = [ 'getOptions', 'getOptionsBatch', 'exportRecords' ]; //From APIFactory.class.php

	//Handle blacklisted methods.
	//  Functions that are blacklisted, or start with _*() should never be called remotely.
	if ( in_array( $method, [ '__construct' ] ) === true || strpos( $method, '_' ) === 0 ) {
		Debug::text( 'ERROR: Method is not part of the child class object! Method: ' . $method . ' Object: ' . get_class( $obj ), __FILE__, __LINE__, __METHOD__, 10 );
		return false;
	}

	$obj_methods = get_class_methods( $obj );

	$obj_parents = class_parents( $obj );
	if ( is_array( $obj_parents ) ) {
		$obj_parent_methods = [];
		foreach ( $obj_parents as $obj_parent ) {
			if ( $obj_parent === 'APIFactory' ) {
				$obj_parent_methods = get_class_methods( $obj_parent );
			}
		}

		$child_class_methods = array_diff( $obj_methods, $obj_parent_methods );
	} else {
		$child_class_methods = $obj_methods;
	}

	$valid_class_methods = array_merge( $child_class_methods, $api_factory_whitelisted_methods );

	if ( in_array( strtolower( $method ), array_map( 'strtolower', $valid_class_methods ), true ) === true ) { //Must be case insensitive, since the remote user might call 'login' rather than 'Login'.
		return true;
	}

	Debug::text( 'ERROR: Method is not part of the child class object! Method: ' . $method . ' Object: ' . get_class( $obj ), __FILE__, __LINE__, __METHOD__, 10 );

	return false;
}

/**
 * Get Cookie/Post/Get variable in that order.
 * @param $var_name
 * @param null $default_value
 * @return mixed|null
 */
function getCookiePostGetVariable( $var_name, $default_value = null ) {
	if ( isset( $_COOKIE[$var_name] ) && $_COOKIE[$var_name] != '' ) {
		$retval = $_COOKIE[$var_name];
	} else if ( isset( $_POST[$var_name] ) && $_POST[$var_name] != '' ) {
		$retval = $_POST[$var_name];
	} else if ( isset( $_GET[$var_name] ) && $_GET[$var_name] != '' ) {
		$retval = $_GET[$var_name];
	} else {
		$retval = $default_value;
	}

	return $retval;
}

/**
 * Returns session ID from _COOKIE, _POST, then _GET.
 * @param int $authentication_type_id
 * @return bool|string
 */
function getSessionID( $authentication_type_id = 800 ) {
	//FIXME: Work-around for bug in Mobile app v3.0.86 that uses old SessionIDs in the Cookie, but correct ones on the URL.
	if ( isset( $_COOKIE['SessionID'] ) && isset( $_GET['SessionID'] ) && $_COOKIE['SessionID'] != $_GET['SessionID'] ) {
		//Debug::Arr( array($_COOKIE, $_POST, $_GET), 'Input Data:', __FILE__, __LINE__, __METHOD__, 10);
		Debug::Text( 'WARNING: Two different SessionIDs sent, COOKIE: ' . $_COOKIE['SessionID'] . ' GET: ' . $_GET['SessionID'], __FILE__, __LINE__, __METHOD__, 10 );
		if ( isset( $_SERVER['REQUEST_URI'] ) && ( stripos( $_SERVER['REQUEST_URI'], 'APIClientStationUnAuthenticated' ) !== false || stripos( $_SERVER['REQUEST_URI'], '/api/report/api.php' ) !== false ) ) {
			Debug::Text( 'Using GET Session ID...', __FILE__, __LINE__, __METHOD__, 10 );
			unset( $_COOKIE['SessionID'] );
		}
	}

	$authentication = new Authentication();
	$session_name = $authentication->getName( $authentication_type_id );

	$session_id = getCookiePostGetVariable( $session_name, false );
	if ( is_string( $session_id ) == false ) {
		$session_id = false;
	}

	return $session_id;
}

/**
 * Returns Station ID from _COOKIE, _POST, then _GET.
 * @return bool|mixed
 */
function getStationID() {
	$station_id = getCookiePostGetVariable( 'StationID', false );

	//Check to see if there is a "sticky" user agent based Station ID defined.
	if ( isset( $_SERVER['HTTP_USER_AGENT'] ) && $_SERVER['HTTP_USER_AGENT'] != '' && stripos( $_SERVER['HTTP_USER_AGENT'], 'StationID:' ) !== false ) {
		if ( preg_match( '/StationID:\s?([a-zA-Z0-9]{30,64})/i', $_SERVER['HTTP_USER_AGENT'], $matches ) > 0 ) {
			if ( isset( $matches[1] ) ) {
				Debug::Text( '  Found StationID in user agent, forcing to that instead!', __FILE__, __LINE__, __METHOD__, 10 );
				$station_id = $matches[1];
			}
		}
	}

	if ( is_string( $station_id ) == false ) {
		$station_id = false;
	}

	return $station_id;
}

/**
 * Handle temporarily overriding user preferences based on Cookie/Post/Get variables.
 * This is useful for ensuring there is always consistent date/time formats and timezones when accessing the API for multiple users.
 * @param $user_obj UserFactory
 * @return bool
 */
function handleOverridePreferences( $user_obj ) {
	$user_pref_obj = $user_obj->getUserPreferenceObject(); /** @var UserPreferenceFactory $user_pref_obj */

	//Allow for BASE64 encoding of the JSON string, as flutter only allows RFC 6265 cookie values, which JSON is not.
	$raw_override_cookie = getCookiePostGetVariable( 'OverrideUserPreference' );
	if ( $raw_override_cookie != '' && strpos( $raw_override_cookie, '{' ) !== 0 ) {
		$raw_override_cookie = base64_decode( $raw_override_cookie );
	}

	if ( $raw_override_cookie != '' ) {
		$override_preferences = json_decode( $raw_override_cookie, true );
		if ( is_array( $override_preferences ) && count( $override_preferences ) > 0 ) {
			//If a user_id is specified, pull the timezone for that user and default to it, rather than the UI having to do a lookup itself and passing it through.
			if ( isset( $override_preferences['user_id'] ) && TTUUID::isUUID( $override_preferences['user_id'] ) && $user_obj->getId() != $override_preferences['user_id'] ) {
				$uplf = TTnew( 'UserPreferenceListFactory' ); /** @var UserPreferenceListFactory $uplf */
				$uplf->getByUserID( $override_preferences['user_id'] ); //Cached
				if ( $uplf->getRecordCount() > 0 ) {
					$override_preferences = array_merge( $uplf->getCurrent()->getObjectAsArray( [ 'time_zone' => true ] ), $override_preferences );
				}

				//If switching to another users timezone, default to appending the timezone on the end of each timestamp unless otherwise specified.
				if ( !isset( $override_preferences['time_format'] ) && strpos( $user_pref_obj->getTimeFormat(), 'T' ) === false ) {
					$override_preferences['time_format'] = $user_pref_obj->getTimeFormat() . ' T';
				}
			}

			Debug::Arr( $override_preferences, 'Overridden Preferences: ', __FILE__, __LINE__, __METHOD__, 10 );
			$user_pref_obj->setObjectFromArray( $override_preferences );
		}
	}

	$user_pref_obj->setDateTimePreferences();

	Debug::text( 'Locale Cookie: ' . TTi18n::getLocaleCookie(), __FILE__, __LINE__, __METHOD__, 10 );

	//If override preferences specifies a language, do not save the users preferences, just use it dynamically instead.
	if ( !isset( $override_preferences['language'] ) && TTi18n::getLocaleCookie() != '' && $user_pref_obj->getLanguage() !== TTi18n::getLanguageFromLocale( TTi18n::getLocaleCookie() ) ) {
		Debug::text( 'Changing User Preference Language to match cookie...', __FILE__, __LINE__, __METHOD__, 10 );
		$user_pref_obj->setLanguage( TTi18n::getLanguageFromLocale( TTi18n::getLocaleCookie() ) );
		if ( $user_pref_obj->isValid() ) {
			$user_pref_obj->Save( false );
		}
	} else {
		Debug::text( 'User Preference Language matches cookie!', __FILE__, __LINE__, __METHOD__, 10 );
	}

	if ( isset( $_GET['language'] ) && $_GET['language'] != '' ) {
		TTi18n::setLocale( $_GET['language'] ); //Sets master locale
	} else {
		TTi18n::setLanguage( $user_pref_obj->getLanguage() );
		TTi18n::setCountry( $user_obj->getCountry() );
		TTi18n::setLocale(); //Sets master locale
	}

	TTi18n::setLocaleCookie(); //Make sure locale cookie is set so APIGlobal.js.php can read it.

	return $user_pref_obj;
}

/**
 * @return bool|string
 */
function getJSONError() {
	$retval = false;

	if ( function_exists( 'json_last_error' ) ) { //Handle PHP v5.3 and older.
		switch ( json_last_error() ) {
			case JSON_ERROR_NONE:
				break;
			case JSON_ERROR_DEPTH:
				$retval = 'Maximum stack depth exceeded';
				break;
			case JSON_ERROR_STATE_MISMATCH:
				$retval = 'Underflow or the modes mismatch';
				break;
			case JSON_ERROR_CTRL_CHAR:
				$retval = 'Unexpected control character found';
				break;
			case JSON_ERROR_SYNTAX:
				$retval = 'Syntax error, malformed JSON';
				break;
			case JSON_ERROR_UTF8:
				$retval = 'Malformed UTF-8 characters, possibly incorrectly encoded';
				break;
			default:
				$retval = 'Unknown error';
				break;
		}
	}

	return $retval;
}

//Make sure cron job information is always logged.
//Don't do this until log rotation is implemented.
/*
Debug::setEnable( TRUE );
Debug::setBufferOutput( TRUE );
Debug::setEnableLog( TRUE );
if ( Debug::getVerbosity() <= 1 ) {
	Debug::setVerbosity( 1 );
}
*/
?>