[FIX] calendar: redirection after invitation email

When accepting/declining a calendar event invitation received by mail,
we landed on an empty gray webclient. The confirmation page had been
dropped with passage to new JS API / new calendar / new webclient.

Previous mechanism had been reimplemented: custom web client with event
information/confirmation if the user is not connected or redirection to
the event form view if the user is connected.

+ FIX manyattendeetag : the status circle did not turn red when an
user declined the invitation.

addons/calendar/controllers/main.py

@@ -48,7 +48,13 @@ class meeting_invitation(http.Controller):
         if attendee:
             attendee_data['current_attendee'] = attendee[0]
 
-        values = dict(init="s.calendar.event('%s', '%s', '%s', '%s' , '%s');" % (db, action, id, 'form', json.dumps(attendee_data)))
+        values = dict(
+            init = """
+                odoo.define('calendar.invitation_page', function (require) {
+                    require('base_calendar.base_calendar').showCalendarInvitation('%s', '%s', '%s', '%s', '%s');
+                });
+            """ % (db, action, id, 'form', json.dumps(attendee_data))
+        )
         return request.render('web.webclient_bootstrap', values)
 
     # Function used, in RPC to check every 5 minutes, if notification to do for an event or not

addons/calendar/static/src/js/base_calendar.js

@@ -8,6 +8,7 @@ var Dialog = require('web.Dialog');
 var form_common = require('web.form_common');
 var Model = require('web.DataModel');
 var Notification = require('web.notification').Notification;
+var session = require('web.session');
 var WebClient = require('web.WebClient');
 var widgets = require('web_calendar.widgets');
 
@@ -252,6 +253,20 @@ var Many2ManyAttendee = FieldMany2ManyTags.extend({
     }
 });
 
+function showCalendarInvitation(db, action, id, view, attendee_data) {
+    session.session_bind(session.origin).then(function () {
+        if (session.session_is_valid(db) && session.username !== "anonymous") {
+            window.location.href = _.str.sprintf('/web?db=%s#id=%s&view_type=form&model=calendar.event', db, id);
+        } else {
+            $("body").prepend(QWeb.render('CalendarInvitation', {attendee_data: JSON.parse(attendee_data)}));
+        }
+    });
+}
+
 core.form_widget_registry.add('many2manyattendee', Many2ManyAttendee);
 
+return {
+    showCalendarInvitation: showCalendarInvitation,
+};
+
 });

addons/calendar/static/src/less/calendar.less

@@ -35,6 +35,10 @@
     &.needsAction {
         background-color: @odoo-brand-secondary;
     }
+
+    &.declined {
+        background-color: @brand-danger;
+    }
 }
 
 .o_calendar_all_responsibles {
@@ -60,3 +64,40 @@
     margin-top: 10px;
     position: relative;
 }
+
+.o_calendar_invitation_page {
+    .o-flex(0, 0, auto);
+    width: 50%;
+    margin: 30px auto 0;
+    .o-webclient-padding(@top: 10px, @bottom: 10px);
+    background-color: @odoo-view-background-color;
+
+    .o_logo {
+        width: 15%;
+    }
+    .o_event_title {
+        margin-left: 20%;
+
+        h2 {
+            margin-top: 0;
+        }
+    }
+    .o_event_table {
+        clear: both;
+        margin: 15px 0 0;
+
+        th {
+            padding-right: 15px;
+        }
+        ul {
+            padding-left: 0;
+        }
+    }
+
+    .o_accepted {
+        color: @brand-success;
+    }
+    .o_declined {
+        color: @brand-danger;
+    }
+}

addons/calendar/static/src/xml/base_calendar.xml

@@ -27,4 +27,41 @@
            </t>
         </t>
     </t>
+
+    <div t-name="CalendarInvitation" class="o_calendar_invitation_page">
+        <div class="pull-right">
+            <t t-esc="attendee_data['current_attendee'].cn"/> (<t t-esc="attendee_data['current_attendee'].email"/>)
+            <div t-if="attendee_data['current_attendee'].state !== 'needsAction'" t-attf-class="o_#{attendee_data['current_attendee'].state}">
+                <t t-if="attendee_data['current_attendee'].state === 'accepted'">Yes I'm going.</t>
+                <t t-if="attendee_data['current_attendee'].state === 'declined'">No I'm not going.</t>
+            </div>
+        </div>
+        <div class="pull-left o_logo">
+            <img class="img img-responsive" src='/web/binary/company_logo'/>
+        </div>
+        <div class="o_event_title">
+            <h2>Calendar Invitation</h2>
+            <h3><t t-esc="attendee_data['meeting'].event"/></h3>
+        </div>
+        <table class="o_event_table table table-striped">
+            <tr>
+                <th>When</th>
+                <td><t t-esc="attendee_data['meeting'].when"/></td>
+            </tr>
+            <tr>
+                <th>Where</th>
+                <td><t t-esc="attendee_data['meeting'].where or '-'"/></td>
+            </tr>
+            <tr>
+                <th>Who</th>
+                <td>
+                    <ul>
+                        <li t-foreach="attendee_data['attendee']" t-as="attendee" t-attf-class="o_#{attendee.status}">
+                            <t t-esc="attendee.name"/>
+                        </li>
+                    </ul>
+                </td>
+            </tr>
+        </table>
+    </div>
 </template>