Add MatrixClient.getEventSenderDeviceInfo()

- a function to get information about the device which sent an event

lib/client.js

@@ -401,6 +401,21 @@ function _setDeviceVerification(client, userId, deviceId, verified, blocked) {
     client.emit("deviceVerificationChanged", userId, deviceId);
 }
 
+/**
+ * Get e2e information on the device that sent an event
+ *
+ * @param {MatrixEvent} event event to be checked
+ *
+ * @return {module:crypto/deviceinfo?}
+ */
+MatrixClient.prototype.getEventSenderDeviceInfo = function(event) {
+    if (!this._crypto) {
+        return null;
+    }
+
+    return this._crypto.getEventSenderDeviceInfo(event);
+};
+
 /**
  * Check if the sender of an event is verified
  *
@@ -410,21 +425,11 @@ function _setDeviceVerification(client, userId, deviceId, verified, blocked) {
  * {@link module:client~MatrixClient#setDeviceVerified|setDeviceVerified}.
  */
 MatrixClient.prototype.isEventSenderVerified = function(event) {
-    if (!this._crypto) {
+    var device = this.getEventSenderDeviceInfo(event);
+    if (!device) {
         return false;
     }
-
-    var sender_key = event.getSenderKey();
-
-    if (!sender_key) {
-        return false;
-    }
-
-    var algorithm = event.getWireContent().algorithm;
-
-    return this._crypto.isSenderKeyVerified(
-        event.getSender(), algorithm, sender_key
-    );
+    return device.isVerified();
 };
 
 /**