Assemble Remote speech before reader delivery

sdk/python/cthulhu_tentacle/session.py

@@ -87,6 +87,21 @@ def valid_remote_speech(speech):
         return False
 
 
+def valid_remote_presentation(request):
+    """Validate one speech call; assembly and lease checks belong to core."""
+    try:
+        _fields(request, ("lease", "epoch", "sequence", "speech"), ("utterance", "final"))
+        utterance, final = request.get("utterance", 0), request.get("final", False)
+        return (_token(request["lease"]) and _positive(request["epoch"])
+                and _positive(request["sequence"]) and valid_remote_speech(request["speech"])
+                and type(utterance) is int and 0 <= utterance < 2**64
+                and type(final) is bool
+                and (utterance == 0 and not final
+                     or 0 < utterance <= request["sequence"] and request["speech"]["kind"] == "speak"))
+    except (ProtocolError, TypeError, ValueError, UnicodeError):
+        return False
+
+
 class SessionError(Exception):
     def __init__(self, code, message):
         super().__init__("Tentacle session error " + str(code))