[poc] show google agenda events in the public calendar

Gemfile

@@ -152,3 +152,5 @@ gem 'sys-filesystem'
 gem 'sha3'
 
 gem 'repost'
+
+gem 'icalendar'

Gemfile.lock

@@ -191,6 +191,9 @@ GEM
       multi_xml (>= 0.5.2)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
+    icalendar (2.5.3)
+      ice_cube (~> 0.16)
+    ice_cube (0.16.3)
     ice_nine (0.11.2)
     jaro_winkler (1.5.1)
     jbuilder (2.5.0)
@@ -497,6 +500,7 @@ DEPENDENCIES
   forgery
   friendly_id (~> 5.1.0)
   has_secure_token
+  icalendar
   jbuilder (~> 2.5)
   jbuilder_cache_multi
   jquery-rails

app/assets/javascripts/controllers/calendar.js

@@ -16,8 +16,8 @@
  * Controller used in the public calendar global
  */
 
-Application.Controllers.controller('CalendarController', ['$scope', '$state', '$aside', 'moment', 'Availability', 'Slot', 'Setting', 'growl', 'dialogs', 'bookingWindowStart', 'bookingWindowEnd', '_t', 'uiCalendarConfig', 'CalendarConfig', 'trainingsPromise', 'machinesPromise', 'spacesPromise',
-  function ($scope, $state, $aside, moment, Availability, Slot, Setting, growl, dialogs, bookingWindowStart, bookingWindowEnd, _t, uiCalendarConfig, CalendarConfig, trainingsPromise, machinesPromise, spacesPromise) {
+Application.Controllers.controller('CalendarController', ['$scope', '$state', '$aside', 'moment', 'Availability', 'Slot', 'Setting', 'growl', 'dialogs', 'bookingWindowStart', 'bookingWindowEnd', '_t', 'uiCalendarConfig', 'CalendarConfig', 'trainingsPromise', 'machinesPromise', 'spacesPromise', 'externalsPromise',
+  function ($scope, $state, $aside, moment, Availability, Slot, Setting, growl, dialogs, bookingWindowStart, bookingWindowEnd, _t, uiCalendarConfig, CalendarConfig, trainingsPromise, machinesPromise, spacesPromise, externalsPromise) {
   /* PRIVATE STATIC CONSTANTS */
     let currentMachineEvent = null;
     machinesPromise.forEach(m => m.checked = true);
@@ -38,6 +38,9 @@ Application.Controllers.controller('CalendarController', ['$scope', '$state', '$
     // List of spaces
     $scope.spaces = spacesPromise.filter(t => !t.disabled);
 
+    // External ICS calendars
+    $scope.externals = externalsPromise;
+
     // add availabilities source to event sources
     $scope.eventSources = [];
 

app/assets/javascripts/router.js.erb

@@ -638,6 +638,7 @@ angular.module('application.router', ['ui.router'])
           trainingsPromise: ['Training', function (Training) { return Training.query().$promise; }],
           machinesPromise: ['Machine', function (Machine) { return Machine.query().$promise; }],
           spacesPromise: ['Space', function (Space) { return Space.query().$promise; }],
+          externalsPromise: ['Ical', function (Ical) { return Ical.get().$promise; }],
           translations: ['Translations', function (Translations) { return Translations.query(['app.public.calendar']).$promise; }]
         }
       })

app/assets/javascripts/services/ical.js

@@ -0,0 +1,5 @@
+'use strict';
+
+Application.Services.factory('Ical', ['$resource', function ($resource) {
+  return $resource('/api/ical/externals');
+}]);

app/controllers/api/ical_controller.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+# API Controller for resources of type iCalendar
+class API::IcalController < API::ApiController
+  respond_to :json
+
+  def externals
+    require 'net/http'
+    require 'uri'
+
+    ics = Net::HTTP.get(URI.parse('https://calendar.google.com/calendar/ical/sylvain%40sleede.com/public/basic.ics'))
+
+    require 'icalendar'
+    require 'icalendar/tzinfo'
+
+    cals = Icalendar::Calendar.parse(ics)
+    @events = cals.first.events
+  end
+end

app/views/api/ical/externals.json.jbuilder

@@ -0,0 +1,8 @@
+json.array!(@events) do |event|
+  json.id event.uid
+  json.title event.summary
+  json.start event.dtstart.iso8601
+  json.end event.dtend.iso8601
+  json.backgroundColor 'white'
+  json.borderColor '#214712'
+end

config/routes.rb

@@ -112,6 +112,8 @@ Rails.application.routes.draw do
       get 'first', action: 'first', on: :collection
     end
 
+    get 'ical/externals' => 'ical#externals'
+
     # for admin
     resources :trainings do
       get :availabilities, on: :member