435 lines
16 KiB
PHP
435 lines
16 KiB
PHP
<?php defined('BASEPATH') or exit('No direct script access allowed');
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/* ----------------------------------------------------------------------------
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* Easy!Appointments - Online Appointment Scheduler
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*
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* @package EasyAppointments
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* @author A.Tselegidis <alextselegidis@gmail.com>
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* @copyright Copyright (c) Alex Tselegidis
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* @license https://opensource.org/licenses/GPL-3.0 - GPLv3
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* @link https://easyappointments.org
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* @since v1.0.0
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* ---------------------------------------------------------------------------- */
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/**
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* Google controller.
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*
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* Handles the Google Calendar synchronization related operations.
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*
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* @package Controllers
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*/
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class Google extends EA_Controller {
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/**
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* Google constructor.
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*/
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public function __construct()
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{
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parent::__construct();
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$this->load->library('google_sync');
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$this->load->model('appointments_model');
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$this->load->model('providers_model');
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$this->load->model('roles_model');
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}
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/**
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* Complete synchronization of appointments between Google Calendar and Easy!Appointments.
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*
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* This method will completely sync the appointments of a provider with his Google Calendar account. The sync period
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* needs to be relatively small, because a lot of API calls might be necessary and this will lead to consuming the
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* Google limit for the Calendar API usage.
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*
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* @param string $provider_id Provider record to be synced.
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*/
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public static function sync(string $provider_id = NULL)
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{
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try
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{
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/** @var EA_Controller $CI */
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$CI = get_instance();
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$CI->load->library('google_sync');
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$CI->load->model('appointments_model');
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$CI->load->model('providers_model');
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$CI->load->model('services_model');
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$CI->load->model('customers_model');
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$CI->load->model('settings_model');
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$user_id = session('user_id');
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if ( ! $user_id && ! is_cli())
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{
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return;
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}
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if ( ! $provider_id)
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{
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throw new InvalidArgumentException('No provider ID provided.');
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}
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$provider = $CI->providers_model->find($provider_id);
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// Check whether the selected provider has the Google Sync enabled.
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$google_sync = $CI->providers_model->get_setting($provider['id'], 'google_sync');
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if ( ! $google_sync)
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{
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throw new Exception('The selected provider has not the google synchronization setting enabled.');
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}
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$google_token = json_decode($CI->providers_model->get_setting($provider['id'], 'google_token'));
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$CI->google_sync->refresh_token($google_token->refresh_token);
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// Fetch provider's appointments that belong to the sync time period.
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$sync_past_days = $CI->providers_model->get_setting($provider['id'], 'sync_past_days');
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$sync_future_days = $CI->providers_model->get_setting($provider['id'], 'sync_future_days');
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$start = strtotime('-' . $sync_past_days . ' days', strtotime(date('Y-m-d')));
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$end = strtotime('+' . $sync_future_days . ' days', strtotime(date('Y-m-d')));
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$where = [
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'start_datetime >=' => date('Y-m-d H:i:s', $start),
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'end_datetime <=' => date('Y-m-d H:i:s', $end),
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'id_users_provider' => $provider['id']
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];
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$appointments = $CI->appointments_model->get($where);
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$settings = [
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'company_name' => setting('company_name'),
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'company_link' => setting('company_link'),
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'company_email' => setting('company_email')
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];
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$provider_timezone = new DateTimeZone($provider['timezone']);
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// Sync each appointment with Google Calendar by following the project's sync protocol (see documentation).
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foreach ($appointments as $appointment)
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{
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if ($appointment['is_unavailability'] == FALSE)
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{
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$service = $CI->services_model->find($appointment['id_services']);
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$customer = $CI->customers_model->find($appointment['id_users_customer']);
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}
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else
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{
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$service = NULL;
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$customer = NULL;
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}
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// If current appointment not synced yet, add to Google Calendar.
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if ($appointment['id_google_calendar'] == NULL)
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{
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$google_event = $CI->google_sync->add_appointment($appointment, $provider, $service, $customer, $settings);
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$appointment['id_google_calendar'] = $google_event->id;
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$CI->appointments_model->save($appointment); // Save the Google Calendar ID.
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}
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else
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{
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// Appointment is synced with Google Calendar.
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try
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{
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$google_event = $CI->google_sync->get_event($provider, $appointment['id_google_calendar']);
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if ($google_event->status == 'cancelled')
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{
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throw new Exception('Event is cancelled, remove the record from Easy!Appointments.');
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}
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// If Google Calendar event is different from Easy!Appointments appointment then update
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// Easy!Appointments record.
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$is_different = FALSE;
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$appointment_start = strtotime($appointment['start_datetime']);
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$appointment_end = strtotime($appointment['end_datetime']);
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$event_start = new DateTime($google_event->getStart()->getDateTime());
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$event_start->setTimezone($provider_timezone);
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$event_end = new DateTime($google_event->getEnd()->getDateTime());
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$event_end->setTimezone($provider_timezone);
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$is_different = $appointment_start !== $event_start->getTimestamp()
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|| $appointment_end !== $event_end->getTimestamp()
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|| $appointment['notes'] !== $google_event->getDescription();
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if ($is_different)
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{
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$appointment['start_datetime'] = $event_start->format('Y-m-d H:i:s');
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$appointment['end_datetime'] = $event_end->format('Y-m-d H:i:s');
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$appointment['notes'] = $google_event->getDescription();
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$CI->appointments_model->save($appointment);
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}
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}
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catch (Throwable $e)
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{
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// Appointment not found on Google Calendar, delete from Easy!Appointments.
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$CI->appointments_model->delete($appointment['id']);
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$appointment['id_google_calendar'] = NULL;
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}
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}
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}
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// Add Google Calendar events that do not exist in Easy!Appointments.
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$google_calendar = $provider['settings']['google_calendar'];
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$google_events = $CI->google_sync->get_sync_events($google_calendar, $start, $end);
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foreach ($google_events->getItems() as $google_event)
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{
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if ($google_event->getStatus() === 'cancelled')
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{
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continue;
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}
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if ($google_event->getStart() === NULL || $google_event->getEnd() === NULL)
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{
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continue;
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}
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if ($google_event->getStart()->getDateTime() === $google_event->getEnd()->getDateTime())
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{
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$event_start = new DateTime($google_event->getStart()->getDate());
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$event_start->setTimezone($provider_timezone);
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$event_end = new DateTime($google_event->getEnd()->getDate());
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$event_end->setTimezone($provider_timezone);
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}
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else
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{
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$event_start = new DateTime($google_event->getStart()->getDateTime());
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$event_start->setTimezone($provider_timezone);
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$event_end = new DateTime($google_event->getEnd()->getDateTime());
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$event_end->setTimezone($provider_timezone);
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}
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$results = $CI->appointments_model->get(['id_google_calendar' => $google_event->getId()]);
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if ( ! empty($results))
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{
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continue;
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}
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// Record doesn't exist in the Easy!Appointments, so add the event now.
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$appointment = [
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'start_datetime' => $event_start->format('Y-m-d H:i:s'),
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'end_datetime' => $event_end->format('Y-m-d H:i:s'),
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'is_unavailability' => TRUE,
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'location' => $google_event->getLocation(),
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'notes' => $google_event->getSummary() . ' ' . $google_event->getDescription(),
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'id_users_provider' => $provider_id,
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'id_google_calendar' => $google_event->getId(),
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'id_users_customer' => NULL,
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'id_services' => NULL,
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];
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$CI->appointments_model->save($appointment);
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}
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json_response([
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'success' => TRUE
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]);
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}
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catch (Throwable $e)
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{
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json_exception($e);
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}
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}
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/**
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* Authorize Google Calendar API usage for a specific provider.
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*
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* Since it is required to follow the web application flow, in order to retrieve a refresh token from the Google API
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* service, this method is going to authorize the given provider.
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*
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* @param string $provider_id The provider id, for whom the sync authorization is made.
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*/
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public function oauth(string $provider_id)
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{
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if ( ! $this->session->userdata('user_id'))
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{
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show_error('Forbidden', 403);
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}
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// Store the provider id for use on the callback function.
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session(['oauth_provider_id' => $provider_id]);
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// Redirect browser to google user content page.
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header('Location: ' . $this->google_sync->get_auth_url());
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}
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/**
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* Callback method for the Google Calendar API authorization process.
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*
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* Once the user grants consent with his Google Calendar data usage, the Google OAuth service will redirect him back
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* in this page. Here we are going to store the refresh token, because this is what will be used to generate access
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* tokens in the future.
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*
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* IMPORTANT: Because it is necessary to authorize the application using the web server flow (see official
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* documentation of OAuth), every Easy!Appointments installation should use its own calendar api key. So in every
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* api console account, the "http://path-to-Easy!Appointments/google/oauth_callback" should be included in an allowed redirect URL.
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*/
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public function oauth_callback()
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{
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if ( ! session('user_id'))
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{
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abort(403, 'Forbidden');
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}
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$code = request('code');
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if (empty($code))
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{
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response('Code authorization failed.');
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return;
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}
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$token = $this->google_sync->authenticate($code);
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if (empty($token))
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{
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response('Token authorization failed.');
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return;
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}
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// Store the token into the database for future reference.
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$oauth_provider_id = session('oauth_provider_id');
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if ($oauth_provider_id)
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{
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$this->providers_model->set_setting($oauth_provider_id, 'google_sync', TRUE);
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$this->providers_model->set_setting($oauth_provider_id, 'google_token', json_encode($token));
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$this->providers_model->set_setting($oauth_provider_id, 'google_calendar', 'primary');
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}
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else
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{
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response('Sync provider id not specified.');
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}
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}
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/**
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* This method will return a list of the available Google Calendars.
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*
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* The user will need to select a specific calendar from this list to sync his appointments with. Google access must
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* be already granted for the specific provider.
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*/
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public function get_google_calendars()
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{
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try
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{
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$provider_id = (int)request('provider_id');
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if (empty($provider_id))
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{
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throw new Exception('Provider id is required in order to fetch the google calendars.');
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}
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// Check if selected provider has sync enabled.
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$google_sync = $this->providers_model->get_setting($provider_id, 'google_sync');
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if ( ! $google_sync)
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{
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json_response([
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'success' => FALSE
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]);
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return;
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}
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$google_token = json_decode($this->providers_model->get_setting($provider_id, 'google_token'));
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$this->google_sync->refresh_token($google_token->refresh_token);
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$calendars = $this->google_sync->get_google_calendars();
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json_response($calendars);
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}
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catch (Throwable $e)
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{
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json_exception($e);
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}
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}
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/**
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* Select a specific google calendar for a provider.
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*
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* All the appointments will be synced with this particular calendar.
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*/
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public function select_google_calendar()
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{
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try
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{
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$provider_id = request('provider_id');
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$user_id = session('user_id');
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if (cannot('edit', PRIV_USERS) && (int)$user_id !== (int)$provider_id)
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{
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throw new Exception('You do not have the required permissions for this task.');
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}
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$calendar_id = request('calendar_id');
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$this->providers_model->set_setting($provider_id, 'google_calendar', $calendar_id);
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json_response([
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'success' => TRUE
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]);
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}
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catch (Throwable $e)
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{
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json_exception($e);
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}
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}
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/**
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* Disable a providers sync setting.
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*
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* This method deletes the "google_sync" and "google_token" settings from the database.
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*
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* After that the provider's appointments will be no longer synced with Google Calendar.
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*/
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public function disable_provider_sync()
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{
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try
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{
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$provider_id = request('provider_id');
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if ( ! $provider_id)
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{
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throw new Exception('Provider id not specified.');
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}
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$user_id = session('user_id');
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if (
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cannot('edit', PRIV_USERS)
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&& (int)$user_id !== (int)$provider_id)
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{
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throw new Exception('You do not have the required permissions for this task.');
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}
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$this->providers_model->set_setting($provider_id, 'google_sync', FALSE);
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$this->providers_model->set_setting($provider_id, 'google_token', NULL);
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$this->appointments_model->clear_google_sync_ids($provider_id);
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json_response([
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'success' => TRUE,
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]);
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}
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catch (Throwable $e)
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{
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json_exception($e);
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}
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}
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}
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