Move request payload into State model

fbchat/_state.py

@@ -0,0 +1,23 @@
+# -*- coding: UTF-8 -*-
+from __future__ import unicode_literals
+
+import attr
+
+from . import _util
+
+
+@attr.s(slots=True, kw_only=True)
+class State(object):
+    """Stores and manages state required for most Facebook requests."""
+
+    fb_dtsg = attr.ib(None)
+    _revision = attr.ib(None)
+
+    def get_params(self):
+        if self.fb_dtsg is None:
+            return {}
+        return {
+            "__a": 1,
+            "__rev": self._revision,
+            "fb_dtsg": self.fb_dtsg,
+        }