304 lines
12 KiB
PHP
304 lines
12 KiB
PHP
<?php defined('BASEPATH') or exit('No direct script access allowed');
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/* ----------------------------------------------------------------------------
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* Easy!Appointments - Open Source Web 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) 2013 - 2020, 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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* This controller handles the Google Calendar synchronization 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('providers_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 int $provider_id Provider record to be synced.
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*/
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public static function sync($provider_id = NULL)
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{
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try
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{
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$CI = get_instance();
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// The user must be logged in.
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if ($CI->session->userdata('user_id') == FALSE && is_cli() === FALSE)
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{
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return;
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}
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if ($provider_id === NULL)
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{
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throw new Exception('Provider id not specified.');
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}
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$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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$provider = $CI->providers_model->get_row($provider_id);
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// Check whether the selected provider has google sync enabled.
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$google_sync = $CI->providers_model->get_setting('google_sync', $provider['id']);
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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('google_token', $provider['id']));
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$CI->load->library('google_sync');
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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('sync_past_days', $provider['id']);
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$sync_future_days = $CI->providers_model->get_setting('sync_future_days', $provider['id']);
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$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_clause = [
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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 = $CI->appointments_model->get_batch($where_clause);
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$company_settings = [
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'company_name' => $CI->settings_model->get_setting('company_name'),
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'company_link' => $CI->settings_model->get_setting('company_link'),
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'company_email' => $CI->settings_model->get_setting('company_email')
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];
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$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_unavailable'] == FALSE)
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{
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$service = $CI->services_model->get_row($appointment['id_services']);
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$customer = $CI->customers_model->get_row($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, $provider,
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$service, $customer, $company_settings);
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$appointment['id_google_calendar'] = $google_event->id;
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$CI->appointments_model->add($appointment); // Save the Google Calendar ID.
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}
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else
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{
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// Appointment is synced with google calendar.
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try
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{
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$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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$is_different = FALSE;
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$appt_start = strtotime($appointment['start_datetime']);
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$appt_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($provider_timezone);
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if ($appt_start != $event_start->getTimestamp() || $appt_end != $event_end->getTimestamp()
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|| $appointment['notes'] !== $google_event->getDescription())
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{
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$is_different = TRUE;
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}
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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->add($appointment);
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}
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}
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catch (Exception $exception)
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{
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// Appointment not found on Google Calendar, delete from Easy!Appoinmtents.
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$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_batch(['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_unavailable' => 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->add($appointment);
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}
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$response = AJAX_SUCCESS;
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}
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catch (Exception $exception)
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{
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$CI->output->set_status_header(500);
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$response = [
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'message' => $exception->getMessage(),
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'trace' => config('debug') ? $exception->getTrace() : []
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];
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}
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$CI->output
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->set_content_type('application/json')
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->set_output(json_encode($response));
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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 int $provider_id The provider id, for whom the sync authorization is made.
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*/
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public function oauth($provider_id)
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{
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// Store the provider id for use on the callback function.
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$this->session->set_userdata('oauth_provider_id', $provider_id);
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// Redirect browser to google user content page.
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header('Location: ' . $this->google_sync->get_auth_url());
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}
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/**
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* Callback method for the Google Calendar API authorization process.
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*
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* Once the user grants consent with his Google Calendar data usage, the Google OAuth service will redirect him back
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* in this page. Here we are going to store the refresh token, because this is what will be used to generate access
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* tokens in the future.
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*
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* IMPORTANT: Because it is necessary to authorize the application using the web server flow (see official
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* documentation of OAuth), every Easy!Appointments installation should use its own calendar api key. So in every
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* api console account, the "http://path-to-Easy!Appointments/google/oauth_callback" should be included in an allowed redirect URL.
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*/
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public function oauth_callback()
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{
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$code = $this->input->get('code');
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if (empty($code))
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{
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$this->output->set_output('Code authorization failed.');
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return;
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}
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$token = $this->google_sync->authenticate($code);
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if (empty($token))
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{
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$this->output->set_output('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 = $this->session->userdata('oauth_provider_id');
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if ($oauth_provider_id)
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{
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$this->providers_model->set_setting('google_sync', TRUE, $oauth_provider_id);
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$this->providers_model->set_setting('google_token', json_encode($token), $oauth_provider_id);
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$this->providers_model->set_setting('google_calendar', 'primary', $oauth_provider_id);
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}
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else
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{
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$this->output->set_output('Sync provider id not specified.');
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}
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}
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}
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