Add attendees to ICS file in meetings

https://community.openproject.org/work_packages/33158

modules/meeting/app/services/meetings/ical_service.rb

@@ -60,10 +60,12 @@ def generate_ical
         e.dtend = ical_datetime meeting.end_time, tzid
         e.url = url_helpers.meeting_url(meeting)
         e.summary = "[#{meeting.project.name}] #{meeting.title}"
-        e.description = ical_subject(meeting)
+        e.description = ical_subject
         e.uid = "#{meeting.id}@#{meeting.project.identifier}"
-        e.organizer = ical_organizer meeting
+        e.organizer = ical_organizer
         e.location = meeting.location.presence
+
+        add_attendees(e)
       end
     end
     # rubocop:enable Metrics/AbcSize
@@ -77,15 +79,35 @@ def ical_event(&)
       calendar.to_ical
     end
 
-    def ical_subject(meeting)
+    def add_attendees(event)
+      meeting.participants.includes(:user).find_each do |participant|
+        user = participant.user
+        next unless user
+
+        address = Icalendar::Values::CalAddress.new(
+          "mailto:#{user.mail}",
+          {
+            "CN" => user.name,
+            "PARTSTAT" => "NEEDS-ACTION",
+            "RSVP" => "TRUE",
+            "CUTYPE" => "INDIVIDUAL",
+            "ROLE" => "REQ-PARTICIPANT"
+          }
+        )
+
+        event.append_attendee(address)
+      end
+    end
+
+    def ical_subject
       "[#{meeting.project.name}] #{I18n.t(:label_meeting)}: #{meeting.title}"
     end
 
     def ical_datetime(time, timezone_id)
       Icalendar::Values::DateTime.new time.in_time_zone(timezone_id), 'tzid' => timezone_id
     end
 
-    def ical_organizer(meeting)
+    def ical_organizer
       Icalendar::Values::CalAddress.new("mailto:#{meeting.author.mail}", cn: meeting.author.name)
     end
   end

modules/meeting/spec/services/meetings/ical_service_spec.rb

@@ -29,17 +29,22 @@
 require 'spec_helper'
 
 RSpec.describe Meetings::ICalService, type: :model do
-  let(:user) { build_stubbed(:user, firstname: 'Bob', lastname: 'Barker') }
-  let(:project) { build_stubbed(:project, name: 'My Project') }
+  shared_let(:user) { create(:user, firstname: 'Bob', lastname: 'Barker', mail: '[email protected]') }
+  shared_let(:user2) { create(:user, firstname: 'Foo', lastname: 'Fooer', mail: '[email protected]') }
+  shared_let(:project) { create(:project, name: 'My Project') }
 
-  let(:meeting) do
-    build_stubbed(:meeting,
-                  author: user,
-                  project:,
-                  title: 'Important meeting',
-                  location: 'https://example.com/meet/important-meeting',
-                  start_time: Time.zone.parse("2021-01-19T10:00:00Z"),
-                  duration: 1.0)
+  shared_let(:meeting) do
+    create(:meeting,
+           author: user,
+           project:,
+           title: 'Important meeting',
+           participants: [
+             MeetingParticipant.new(user:),
+             MeetingParticipant.new(user: user2)
+           ],
+           location: 'https://example.com/meet/important-meeting',
+           start_time: Time.zone.parse("2021-01-19T10:00:00Z"),
+           duration: 1.0)
   end
 
   let(:service) { described_class.new(user:, meeting:) }
@@ -68,6 +73,7 @@
     it 'renders the ICS file', :aggregate_failures do
       expect(result).to be_a String
 
+      expect(entry.attendee.map(&:to_s)).to contain_exactly('mailto:[email protected]', 'mailto:[email protected]')
       expect(entry.dtstart.utc).to eq meeting.start_time
       expect(entry.dtend.utc).to eq meeting.start_time + 1.hour
       expect(entry.summary).to eq '[My Project] Important meeting'