fix: trap UnicodeEncodeError

Closes #606

autopush/tests/test_websocket.py

@@ -245,6 +245,20 @@ def check_subbed(s):
         self.proto.processHandshake()
         eq_(self.proto.factory.externalPort, 80)
 
+    def test_handshake_decode_error(self):
+        self.proto.factory = Mock(externalPort=80)
+
+        def check_subbed(s):
+            u'\xfe'.encode('ascii')
+
+        self.proto.failHandshake = Mock()
+        self.proto.parent_class = Mock(**{"processHandshake.side_effect":
+                                          check_subbed})
+        self.proto.processHandshake()
+        self.proto.failHandshake.assert_called_with(
+            "Error reading handshake data"
+        )
+
     def test_binary_msg(self):
         self.proto.onMessage(b"asdfasdf", True)
         d = Deferred()

autopush/websocket.py

@@ -384,15 +384,16 @@ def processHandshake(self):
         track_object(self, msg="processHandshake")
         port = self.ap_settings.port
         hide = port != 80 and port != 443
-        if not hide:
-            return self.parent_class.processHandshake(self)
-
         old_port = self.factory.externalPort
         try:
-            self.factory.externalPort = None
+            if hide:
+                self.factory.externalPort = None
             return self.parent_class.processHandshake(self)
+        except UnicodeEncodeError:
+            self.failHandshake("Error reading handshake data")
         finally:
-            self.factory.externalPort = old_port
+            if hide:
+                self.factory.externalPort = old_port
 
     @log_exception
     def onMessage(self, payload, isBinary):