1 files changed, 23 insertions, 1 deletions
diff --git a/synapse/api/room_versions.py b/synapse/api/room_versions.py
index af3612ed61..0901afb900 100644
--- a/synapse/api/room_versions.py
+++ b/synapse/api/room_versions.py
@@ -59,7 +59,11 @@ class RoomVersion(object):
 
     # bool: before MSC2261/MSC2432, m.room.aliases had special auth rules and redaction rules
     special_case_aliases_auth = attr.ib(type=bool)
-
+    # Strictly enforce canonicaljson, do not allow:
+    # * Integers outside the range of [-2 ^ 53 + 1, 2 ^ 53 - 1]
+    # * Floats
+    # * NaN, Infinity, -Infinity
+    strict_canonicaljson = attr.ib(type=bool)
     # bool: MSC2209: Check 'notifications' key while verifying
     # m.room.power_levels auth rules.
     limit_notifications_power_levels = attr.ib(type=bool)
@@ -73,6 +77,7 @@ class RoomVersions(object):
         StateResolutionVersions.V1,
         enforce_key_validity=False,
         special_case_aliases_auth=True,
+        strict_canonicaljson=False,
         limit_notifications_power_levels=False,
     )
     V2 = RoomVersion(
@@ -82,6 +87,7 @@ class RoomVersions(object):
         StateResolutionVersions.V2,
         enforce_key_validity=False,
         special_case_aliases_auth=True,
+        strict_canonicaljson=False,
         limit_notifications_power_levels=False,
     )
     V3 = RoomVersion(
@@ -91,6 +97,7 @@ class RoomVersions(object):
         StateResolutionVersions.V2,
         enforce_key_validity=False,
         special_case_aliases_auth=True,
+        strict_canonicaljson=False,
         limit_notifications_power_levels=False,
     )
     V4 = RoomVersion(
@@ -100,6 +107,7 @@ class RoomVersions(object):
         StateResolutionVersions.V2,
         enforce_key_validity=False,
         special_case_aliases_auth=True,
+        strict_canonicaljson=False,
         limit_notifications_power_levels=False,
     )
     V5 = RoomVersion(
@@ -109,6 +117,7 @@ class RoomVersions(object):
         StateResolutionVersions.V2,
         enforce_key_validity=True,
         special_case_aliases_auth=True,
+        strict_canonicaljson=False,
         limit_notifications_power_levels=False,
     )
     MSC2432_DEV = RoomVersion(
@@ -118,6 +127,17 @@ class RoomVersions(object):
         StateResolutionVersions.V2,
         enforce_key_validity=True,
         special_case_aliases_auth=False,
+        strict_canonicaljson=False,
+        limit_notifications_power_levels=False,
+    )
+    STRICT_CANONICALJSON = RoomVersion(
+        "org.matrix.strict_canonicaljson",
+        RoomDisposition.UNSTABLE,
+        EventFormatVersions.V3,
+        StateResolutionVersions.V2,
+        enforce_key_validity=True,
+        special_case_aliases_auth=True,
+        strict_canonicaljson=True,
         limit_notifications_power_levels=False,
     )
     MSC2209_DEV = RoomVersion(
@@ -127,6 +147,7 @@ class RoomVersions(object):
         StateResolutionVersions.V2,
         enforce_key_validity=True,
         special_case_aliases_auth=True,
+        strict_canonicaljson=False,
         limit_notifications_power_levels=True,
     )
 
@@ -140,6 +161,7 @@ KNOWN_ROOM_VERSIONS = {
         RoomVersions.V4,
         RoomVersions.V5,
         RoomVersions.MSC2432_DEV,
+        RoomVersions.STRICT_CANONICALJSON,
         RoomVersions.MSC2209_DEV,
     )
 }  # type: Dict[str, RoomVersion]