Remove the `active` flag for devices.

Instead of setting `active` to `false`, we remove the device entirely
(unless its the current device).

Doing it this way means more fetching of bundles for devices that
disappear and then reappear from a user's devicelist.

However, there might be caching invalidation concerns with just reusing
a cached bundle for a device id that disappeared and then reappears.

Additionally this change simplifies the showing of a contact's device
fingerprints in the modal, since we don't have to take active/inactive
into consideration.

updates #497

spec/omemo.js

@@ -351,8 +351,6 @@
                 let devices = _converse.devicelists.get(contact_jid).devices;
                 expect(devices.length).toBe(2);
                 expect(_.map(devices.models, 'attributes.id').sort().join()).toBe('1234,4223');
-                expect(devices.get('1234').get('active')).toBe(true);
-                expect(devices.get('4223').get('active')).toBe(true);
 
                 stanza = $msg({
                     'from': contact_jid,
@@ -368,11 +366,8 @@
                 _converse.connection._dataRecv(test_utils.createRequest(stanza));
 
                 expect(_converse.devicelists.length).toBe(2);
-                expect(devices.length).toBe(3);
-                expect(_.map(devices.models, 'attributes.id').sort().join()).toBe('1234,4223,4224');
-                expect(devices.get('1234').get('active')).toBe(false);
-                expect(devices.get('4223').get('active')).toBe(true);
-                expect(devices.get('4224').get('active')).toBe(true);
+                expect(devices.length).toBe(2);
+                expect(_.map(devices.models, 'attributes.id').sort().join()).toBe('4223,4224');
 
                 // Check that own devicelist gets updated
                 stanza = $msg({
@@ -393,9 +388,6 @@
                 devices = _converse.devicelists.get(_converse.bare_jid).devices;
                 expect(devices.length).toBe(3);
                 expect(_.map(devices.models, 'attributes.id').sort().join()).toBe('123456789,555,777');
-                expect(devices.get('123456789').get('active')).toBe(true);
-                expect(devices.get('555').get('active')).toBe(true);
-                expect(devices.get('777').get('active')).toBe(true);
 
                 _converse.connection.IQ_stanzas = [];
 
@@ -441,13 +433,9 @@
                 expect(_converse.devicelists.length).toBe(2);
                 const devices = _converse.devicelists.get(_converse.bare_jid).devices;
                 // The device id for this device (123456789) was also generated and added to the list,
-                // which is why we have 4 devices now.
-                expect(devices.length).toBe(4);
-                expect(_.map(devices.models, 'attributes.id').sort().join()).toBe('123456789,444,555,777');
-                expect(devices.get('123456789').get('active')).toBe(true);
-                expect(devices.get('444').get('active')).toBe(true);
-                expect(devices.get('555').get('active')).toBe(false);
-                expect(devices.get('777').get('active')).toBe(false);
+                // which is why we have 2 devices now.
+                expect(devices.length).toBe(2);
+                expect(_.map(devices.models, 'attributes.id').sort().join()).toBe('123456789,444');
                 done();
             }).catch(_.partial(_converse.log, _, Strophe.LogLevel.FATAL))
         }));
@@ -994,6 +982,9 @@
 
                 expect(modal.el.querySelectorAll('input[type="radio"]').length).toBe(2);
 
+                const devicelist = _converse.devicelists.get(contact_jid);
+                expect(devicelist.devices.get('555').get('trusted')).toBe(0);
+
                 let trusted_radio = modal.el.querySelector('input[type="radio"][name="555"][value="1"]');
                 expect(trusted_radio.checked).toBe(true);
 
@@ -1004,9 +995,13 @@
                 untrusted_radio.click();
                 trusted_radio = document.querySelector('input[type="radio"][name="555"][value="1"]');
                 expect(trusted_radio.hasAttribute('checked')).toBe(false);
+                expect(devicelist.devices.get('555').get('trusted')).toBe(-1);
 
                 untrusted_radio = document.querySelector('input[type="radio"][name="555"][value="-1"]');
                 expect(untrusted_radio.hasAttribute('checked')).toBe(true);
+
+                trusted_radio.click();
+                expect(devicelist.devices.get('555').get('trusted')).toBe(1);
                 done();
             }).catch(_.partial(_converse.log, _, Strophe.LogLevel.FATAL))
         }));

src/converse-omemo.js

@@ -672,7 +672,6 @@
 
             _converse.Device = Backbone.Model.extend({
                 defaults: {
-                    'active': true,
                     'trusted': UNDECIDED
                 },
 
@@ -758,8 +757,7 @@
                             const device_id = _converse.omemo_store.get('device_id'),
                                   own_device = this.devices.findWhere({'id': device_id});
 
-                            if (!_.includes(device_ids, device_id) || !own_device.get('active')) {
-                                own_device.save('active', true, {'silent': true});
+                            if (!_.includes(device_ids, device_id)) {
                                 return this.publishDevices();
                             }
                         });
@@ -788,9 +786,7 @@
                         .c('publish', {'node': Strophe.NS.OMEMO_DEVICELIST})
                             .c('item')
                                 .c('list', {'xmlns': Strophe.NS.OMEMO})
-                    _.each(this.devices.where({'active': true}), (device) => {
-                        stanza.c('device', {'id': device.get('id')}).up();
-                    });
+                    this.devices.each(device => stanza.c('device', {'id': device.get('id')}).up());
                     return _converse.api.sendIQ(stanza);
                 },
 
@@ -881,12 +877,16 @@
                       devices = devicelist.devices,
                       removed_ids = _.difference(devices.pluck('id'), device_ids);
 
-                _.forEach(removed_ids, (removed_id) => devices.get(removed_id).save('active', false));
+                _.forEach(removed_ids, (id) => {
+                    if (jid === _converse.bare_jid && id === _converse.omemo_store.get('device_id')) {
+                        // We don't remove the current device
+                        return
+                    }
+                    devices.get(id).destroy();
+                });
+
                 _.forEach(device_ids, (device_id) => {
-                    const dev = devices.get(device_id);
-                    if (dev) {
-                        dev.save({'active': true});
-                    } else {
+                    if (!devices.get(device_id)) {
                         devices.create({'id': device_id, 'jid': jid})
                     }
                 });