Implement MSC2176: Updated redaction rules (#8984)

An experimental room version ("org.matrix.msc2176") contains
the new redaction rules for testing.

1 files changed, 26 insertions, 6 deletions

diff --git a/synapse/api/room_versions.py b/synapse/api/room_versions.py
index f3ecbf36b6..de2cc15d33 100644
--- a/synapse/api/room_versions.py
+++ b/synapse/api/room_versions.py
@@ -51,11 +51,11 @@ class RoomDisposition:
 class RoomVersion:
     """An object which describes the unique attributes of a room version."""
 
-    identifier = attr.ib()  # str; the identifier for this version
-    disposition = attr.ib()  # str; one of the RoomDispositions
-    event_format = attr.ib()  # int; one of the EventFormatVersions
-    state_res = attr.ib()  # int; one of the StateResolutionVersions
-    enforce_key_validity = attr.ib()  # bool
+    identifier = attr.ib(type=str)  # the identifier for this version
+    disposition = attr.ib(type=str)  # one of the RoomDispositions
+    event_format = attr.ib(type=int)  # one of the EventFormatVersions
+    state_res = attr.ib(type=int)  # one of the StateResolutionVersions
+    enforce_key_validity = attr.ib(type=bool)
 
     # bool: before MSC2261/MSC2432, m.room.aliases had special auth rules and redaction rules
     special_case_aliases_auth = attr.ib(type=bool)
@@ -64,9 +64,11 @@ class RoomVersion:
     # * Floats
     # * NaN, Infinity, -Infinity
     strict_canonicaljson = attr.ib(type=bool)
-    # bool: MSC2209: Check 'notifications' key while verifying
+    # MSC2209: Check 'notifications' key while verifying
     # m.room.power_levels auth rules.
     limit_notifications_power_levels = attr.ib(type=bool)
+    # MSC2174/MSC2176: Apply updated redaction rules algorithm.
+    msc2176_redaction_rules = attr.ib(type=bool)
 
 
 class RoomVersions:
@@ -79,6 +81,7 @@ class RoomVersions:
         special_case_aliases_auth=True,
         strict_canonicaljson=False,
         limit_notifications_power_levels=False,
+        msc2176_redaction_rules=False,
     )
     V2 = RoomVersion(
         "2",
@@ -89,6 +92,7 @@ class RoomVersions:
         special_case_aliases_auth=True,
         strict_canonicaljson=False,
         limit_notifications_power_levels=False,
+        msc2176_redaction_rules=False,
     )
     V3 = RoomVersion(
         "3",
@@ -99,6 +103,7 @@ class RoomVersions:
         special_case_aliases_auth=True,
         strict_canonicaljson=False,
         limit_notifications_power_levels=False,
+        msc2176_redaction_rules=False,
     )
     V4 = RoomVersion(
         "4",
@@ -109,6 +114,7 @@ class RoomVersions:
         special_case_aliases_auth=True,
         strict_canonicaljson=False,
         limit_notifications_power_levels=False,
+        msc2176_redaction_rules=False,
     )
     V5 = RoomVersion(
         "5",
@@ -119,6 +125,7 @@ class RoomVersions:
         special_case_aliases_auth=True,
         strict_canonicaljson=False,
         limit_notifications_power_levels=False,
+        msc2176_redaction_rules=False,
     )
     V6 = RoomVersion(
         "6",
@@ -129,6 +136,18 @@ class RoomVersions:
         special_case_aliases_auth=False,
         strict_canonicaljson=True,
         limit_notifications_power_levels=True,
+        msc2176_redaction_rules=False,
+    )
+    MSC2176 = RoomVersion(
+        "org.matrix.msc2176",
+        RoomDisposition.UNSTABLE,
+        EventFormatVersions.V3,
+        StateResolutionVersions.V2,
+        enforce_key_validity=True,
+        special_case_aliases_auth=False,
+        strict_canonicaljson=True,
+        limit_notifications_power_levels=True,
+        msc2176_redaction_rules=True,
     )
 
 
@@ -141,5 +160,6 @@ KNOWN_ROOM_VERSIONS = {
         RoomVersions.V4,
         RoomVersions.V5,
         RoomVersions.V6,
+        RoomVersions.MSC2176,
     )
 }  # type: Dict[str, RoomVersion]