easyappointments/src/application/controllers/Google.php

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<?php defined('BASEPATH') OR exit('No direct script access allowed');
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/* ----------------------------------------------------------------------------
* Easy!Appointments - Open Source Web Scheduler
*
* @package EasyAppointments
* @author A.Tselegidis <alextselegidis@gmail.com>
* @copyright Copyright (c) 2013 - 2018, Alex Tselegidis
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* @license http://opensource.org/licenses/GPL-3.0 - GPLv3
* @link http://easyappointments.org
* @since v1.0.0
* ---------------------------------------------------------------------------- */
/**
* Google Controller
*
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* This controller handles the Google Calendar synchronization operations.
*
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* @package Controllers
*/
class Google extends CI_Controller {
/**
* Class Constructor
*/
public function __construct()
{
parent::__construct();
$this->load->library('session');
}
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/**
* Authorize Google Calendar API usage for a specific provider.
*
* Since it is required to follow the web application flow, in order to retrieve a refresh token from the Google API
* service, this method is going to authorize the given provider.
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*
* @param int $provider_id The provider id, for whom the sync authorization is made.
*/
public function oauth($provider_id)
{
// Store the provider id for use on the callback function.
$_SESSION['oauth_provider_id'] = $provider_id;
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// Redirect browser to google user content page.
$this->load->library('Google_sync');
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header('Location: ' . $this->google_sync->get_auth_url());
}
/**
* Callback method for the Google Calendar API authorization process.
*
* Once the user grants consent with his Google Calendar data usage, the Google OAuth service will redirect him back
* in this page. Here we are going to store the refresh token, because this is what will be used to generate access
* tokens in the future.
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*
* IMPORTANT: Because it is necessary to authorize the application using the web server flow (see official
* documentation of OAuth), every Easy!Appointments installation should use its own calendar api key. So in every
* api console account, the "http://path-to-e!a/google/oauth_callback" should be included in an allowed redirect URL.
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*/
public function oauth_callback()
{
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if ($this->input->get('code'))
{
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$this->load->library('Google_sync');
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$token = $this->google_sync->authenticate($this->input->get('code'));
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// Store the token into the database for future reference.
if (isset($_SESSION['oauth_provider_id']))
{
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$this->load->model('providers_model');
$this->providers_model->set_setting('google_sync', TRUE, $_SESSION['oauth_provider_id']);
$this->providers_model->set_setting('google_token', $token, $_SESSION['oauth_provider_id']);
$this->providers_model->set_setting('google_calendar', 'primary', $_SESSION['oauth_provider_id']);
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}
else
{
$this->output->set_output('<h1>Sync provider id not specified!</h1>');
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}
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}
else
{
$this->output->set_output('<h1>Authorization Failed!</h1>');
}
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}
/**
* Complete synchronization of appointments between Google Calendar and Easy!Appointments.
*
* This method will completely sync the appointments of a provider with his Google Calendar account. The sync period
* needs to be relatively small, because a lot of API calls might be necessary and this will lead to consuming the
* Google limit for the Calendar API usage.
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*
* @param int $provider_id Provider record to be synced.
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*/
public function sync($provider_id = NULL)
{
try
{
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// The user must be logged in.
$this->load->library('session');
if ($this->session->userdata('user_id') == FALSE)
{
return;
}
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if ($provider_id === NULL)
{
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throw new Exception('Provider id not specified.');
}
$this->load->model('appointments_model');
$this->load->model('providers_model');
$this->load->model('services_model');
$this->load->model('customers_model');
$this->load->model('settings_model');
$provider = $this->providers_model->get_row($provider_id);
// Check whether the selected provider has google sync enabled.
$google_sync = $this->providers_model->get_setting('google_sync', $provider['id']);
if ( ! $google_sync)
{
throw new Exception('The selected provider has not the google synchronization setting enabled.');
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}
$google_token = json_decode($this->providers_model->get_setting('google_token', $provider['id']));
$this->load->library('google_sync');
$this->google_sync->refresh_token($google_token->refresh_token);
// Fetch provider's appointments that belong to the sync time period.
$sync_past_days = $this->providers_model->get_setting('sync_past_days', $provider['id']);
$sync_future_days = $this->providers_model->get_setting('sync_future_days', $provider['id']);
$start = strtotime('-' . $sync_past_days . ' days', strtotime(date('Y-m-d')));
$end = strtotime('+' . $sync_future_days . ' days', strtotime(date('Y-m-d')));
$where_clause = [
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'start_datetime >=' => date('Y-m-d H:i:s', $start),
'end_datetime <=' => date('Y-m-d H:i:s', $end),
'id_users_provider' => $provider['id']
];
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$appointments = $this->appointments_model->get_batch($where_clause);
$company_settings = [
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'company_name' => $this->settings_model->get_setting('company_name'),
'company_link' => $this->settings_model->get_setting('company_link'),
'company_email' => $this->settings_model->get_setting('company_email')
];
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// Sync each appointment with Google Calendar by following the project's sync protocol (see documentation).
foreach ($appointments as $appointment)
{
if ($appointment['is_unavailable'] == FALSE)
{
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$service = $this->services_model->get_row($appointment['id_services']);
$customer = $this->customers_model->get_row($appointment['id_users_customer']);
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}
else
{
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$service = NULL;
$customer = NULL;
}
// If current appointment not synced yet, add to gcal.
if ($appointment['id_google_calendar'] == NULL)
{
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$google_event = $this->google_sync->add_appointment($appointment, $provider,
$service, $customer, $company_settings);
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$appointment['id_google_calendar'] = $google_event->id;
$this->appointments_model->add($appointment); // Save gcal id
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}
else
{
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// Appointment is synced with google calendar.
try
{
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$google_event = $this->google_sync->get_event($provider, $appointment['id_google_calendar']);
if ($google_event->status == 'cancelled')
{
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throw new Exception('Event is cancelled, remove the record from Easy!Appointments.');
}
// If gcal event is different from e!a appointment then update e!a record.
$is_different = FALSE;
$appt_start = strtotime($appointment['start_datetime']);
$appt_end = strtotime($appointment['end_datetime']);
$event_start = strtotime($google_event->getStart()->getDateTime());
$event_end = strtotime($google_event->getEnd()->getDateTime());
if ($appt_start != $event_start || $appt_end != $event_end
|| $appointment['notes'] !== $google_event->getDescription())
{
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$is_different = TRUE;
}
if ($is_different)
{
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$appointment['start_datetime'] = date('Y-m-d H:i:s', $event_start);
$appointment['end_datetime'] = date('Y-m-d H:i:s', $event_end);
$appointment['notes'] = $google_event->getDescription();
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$this->appointments_model->add($appointment);
}
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}
catch (Exception $exc)
{
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// Appointment not found on gcal, delete from e!a.
$this->appointments_model->delete($appointment['id']);
$appointment['id_google_calendar'] = NULL;
}
}
}
// :: ADD GCAL EVENTS THAT ARE NOT PRESENT ON E!A
$google_calendar = $provider['settings']['google_calendar'];
$events = $this->google_sync->get_sync_events($google_calendar, $start, $end);
foreach ($events->getItems() as $event)
{
$results = $this->appointments_model->get_batch(['id_google_calendar' => $event->getId()]);
if (!empty($results) || empty($event)) {
continue;
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}
// Record doesn't exist in E!A, so add the event now.
$appointment = [
'start_datetime' => date('Y-m-d H:i:s', strtotime($event->start->getDateTime())),
'end_datetime' => date('Y-m-d H:i:s', strtotime($event->end->getDateTime())),
'is_unavailable' => TRUE,
'location' => $event->getLocation(),
'notes' => $event->getSummary() . ' ' . $event->getDescription(),
'id_users_provider' => $provider_id,
'id_google_calendar' => $event->getId(),
'id_users_customer' => NULL,
'id_services' => NULL,
];
$this->appointments_model->add($appointment);
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}
$this->output
->set_content_type('application/json')
->set_output(json_encode(AJAX_SUCCESS));
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}
catch (Exception $exc)
{
$this->output
->set_content_type('application/json')
->set_output(json_encode(['exceptions' => [exceptionToJavaScript($exc)]]));
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}
}
}