D11956.diff
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	diff --git a/lib/handlers/peer-to-peer-message-handler.js b/lib/handlers/peer-to-peer-message-handler.js
	--- a/lib/handlers/peer-to-peer-message-handler.js
	+++ b/lib/handlers/peer-to-peer-message-handler.js
	@@ -1,5 +1,8 @@
	// @flow

	+import _isEqual from 'lodash/fp/isEqual.js';
	+
	+import { verifyAndGetDeviceList } from '../shared/device-list-utils.js';
	import type {
	IdentityServiceClient,
	DeviceOlmInboundKeys,
	@@ -127,6 +130,38 @@
	} catch (e) {
	console.log(`Error uploading one-time keys: ${e.message}`);
	}
	+ } else if (message.type === peerToPeerMessageTypes.DEVICE_LIST_UPDATED) {
	+ try {
	+ const result = await verifyAndGetDeviceList(
	+ identityClient,
	+ message.userID,
	+ null,
	+ );
	+ if (result.valid) {
	+ console.log(
	+ `Received valid device list update for user ${message.userID}`,
	+ );
	+ const receivedRawList = JSON.parse(
	+ message.signedDeviceList.rawDeviceList,
	+ );
	+
	+ // additional check for broadcasted and Identity device list equality
	+ const listsAreEqual = _isEqual(result.deviceList)(receivedRawList);
	+ console.log(
	+ `Identity and received device lists are ${
	+ listsAreEqual ? '' : 'not'
	+ } equal.`,
	+ );
	+ } else {
	+ console.log(
	+ `Received invalid device list update for user ${message.userID}. Reason: ${result.reason}`,
	+ );
	+ }
	+ } catch (e) {
	+ console.log(
	+ `Error verifying device list for user ${message.userID}: ${e}`,
	+ );
	+ }
	}
	}