1 files changed, 10 insertions, 0 deletions
diff --git a/synapse/types.py b/synapse/types.py
index c51bc8e4f2..649ff2f7d7 100644
--- a/synapse/types.py
+++ b/synapse/types.py
@@ -78,6 +78,11 @@ class DomainSpecificString(
         """Create a structure on the local domain"""
         return cls(localpart=localpart, domain=hs.hostname, is_mine=True)
 
+    @classmethod
+    def create(cls, localpart, domain, hs):
+        is_mine = domain == hs.hostname
+        return cls(localpart=localpart, domain=domain, is_mine=is_mine)
+
 
 class UserID(DomainSpecificString):
     """Structure representing a user ID."""
@@ -94,6 +99,11 @@ class RoomID(DomainSpecificString):
     SIGIL = "!"
 
 
+class EventID(DomainSpecificString):
+    """Structure representing an event id. """
+    SIGIL = "$"
+
+
 class StreamToken(
     namedtuple(
         "Token",