prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  Implement rooms v5
  Synapse v1.0 will default to rooms v4, however the intention is that it also ships with rooms v5 which is envisaged to be rooms v4 + https://github.com/matrix-org/synapse/issues/4364
  
  rooms v5 is yet to be MSC'd so does not formally exist at this point, this issue is a place holder.
  
  </issue>
  <code>
  [start of synapse/api/room_versions.py]
  1 # -*- coding: utf-8 -*-
  2 # Copyright 2019 New Vector Ltd
  3 #
  4 # Licensed under the Apache License, Version 2.0 (the "License");
  5 # you may not use this file except in compliance with the License.
  6 # You may obtain a copy of the License at
  7 #
  8 #     http://www.apache.org/licenses/LICENSE-2.0
  9 #
  10 # Unless required by applicable law or agreed to in writing, software
  11 # distributed under the License is distributed on an "AS IS" BASIS,
  12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13 # See the License for the specific language governing permissions and
  14 # limitations under the License.
  15 import attr
  16 
  17 
  18 class EventFormatVersions(object):
  19     """This is an internal enum for tracking the version of the event format,
  20     independently from the room version.
  21     """
  22     V1 = 1   # $id:server event id format
  23     V2 = 2   # MSC1659-style $hash event id format: introduced for room v3
  24     V3 = 3   # MSC1884-style $hash format: introduced for room v4
  25 
  26 
  27 KNOWN_EVENT_FORMAT_VERSIONS = {
  28     EventFormatVersions.V1,
  29     EventFormatVersions.V2,
  30     EventFormatVersions.V3,
  31 }
  32 
  33 
  34 class StateResolutionVersions(object):
  35     """Enum to identify the state resolution algorithms"""
  36     V1 = 1   # room v1 state res
  37     V2 = 2   # MSC1442 state res: room v2 and later
  38 
  39 
  40 class RoomDisposition(object):
  41     STABLE = "stable"
  42     UNSTABLE = "unstable"
  43 
  44 
  45 @attr.s(slots=True, frozen=True)
  46 class RoomVersion(object):
  47     """An object which describes the unique attributes of a room version."""
  48 
  49     identifier = attr.ib()      # str; the identifier for this version
  50     disposition = attr.ib()     # str; one of the RoomDispositions
  51     event_format = attr.ib()    # int; one of the EventFormatVersions
  52     state_res = attr.ib()       # int; one of the StateResolutionVersions
  53     enforce_key_validity = attr.ib()  # bool
  54 
  55 
  56 class RoomVersions(object):
  57     V1 = RoomVersion(
  58         "1",
  59         RoomDisposition.STABLE,
  60         EventFormatVersions.V1,
  61         StateResolutionVersions.V1,
  62         enforce_key_validity=False,
  63     )
  64     V2 = RoomVersion(
  65         "2",
  66         RoomDisposition.STABLE,
  67         EventFormatVersions.V1,
  68         StateResolutionVersions.V2,
  69         enforce_key_validity=False,
  70     )
  71     V3 = RoomVersion(
  72         "3",
  73         RoomDisposition.STABLE,
  74         EventFormatVersions.V2,
  75         StateResolutionVersions.V2,
  76         enforce_key_validity=False,
  77     )
  78     V4 = RoomVersion(
  79         "4",
  80         RoomDisposition.STABLE,
  81         EventFormatVersions.V3,
  82         StateResolutionVersions.V2,
  83         enforce_key_validity=False,
  84     )
  85     VDH_TEST_KEY_VALIDITY = RoomVersion(
  86         "vdh-test-key-validity",
  87         RoomDisposition.UNSTABLE,
  88         EventFormatVersions.V3,
  89         StateResolutionVersions.V2,
  90         enforce_key_validity=False,
  91     )
  92 
  93 
  94 KNOWN_ROOM_VERSIONS = {
  95     v.identifier: v for v in (
  96         RoomVersions.V1,
  97         RoomVersions.V2,
  98         RoomVersions.V3,
  99         RoomVersions.V4,
  100         RoomVersions.VDH_TEST_KEY_VALIDITY,
  101     )
  102 }   # type: dict[str, RoomVersion]
  103
  [end of synapse/api/room_versions.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/synapse/api/room_versions.py b/synapse/api/room_versions.py
  --- a/synapse/api/room_versions.py
  +++ b/synapse/api/room_versions.py
  @@ -82,12 +82,12 @@
           StateResolutionVersions.V2,
           enforce_key_validity=False,
       )
  -    VDH_TEST_KEY_VALIDITY = RoomVersion(
  -        "vdh-test-key-validity",
  -        RoomDisposition.UNSTABLE,
  +    V5 = RoomVersion(
  +        "5",
  +        RoomDisposition.STABLE,
           EventFormatVersions.V3,
           StateResolutionVersions.V2,
  -        enforce_key_validity=False,
  +        enforce_key_validity=True,
       )
   
   
  @@ -97,6 +97,6 @@
           RoomVersions.V2,
           RoomVersions.V3,
           RoomVersions.V4,
  -        RoomVersions.VDH_TEST_KEY_VALIDITY,
  +        RoomVersions.V5,
       )
   }   # type: dict[str, RoomVersion]
  
verification_info: {"golden_diff": "diff --git a/synapse/api/room_versions.py b/synapse/api/room_versions.py\n--- a/synapse/api/room_versions.py\n+++ b/synapse/api/room_versions.py\n@@ -82,12 +82,12 @@\n         StateResolutionVersions.V2,\n         enforce_key_validity=False,\n     )\n-    VDH_TEST_KEY_VALIDITY = RoomVersion(\n-        \"vdh-test-key-validity\",\n-        RoomDisposition.UNSTABLE,\n+    V5 = RoomVersion(\n+        \"5\",\n+        RoomDisposition.STABLE,\n         EventFormatVersions.V3,\n         StateResolutionVersions.V2,\n-        enforce_key_validity=False,\n+        enforce_key_validity=True,\n     )\n \n \n@@ -97,6 +97,6 @@\n         RoomVersions.V2,\n         RoomVersions.V3,\n         RoomVersions.V4,\n-        RoomVersions.VDH_TEST_KEY_VALIDITY,\n+        RoomVersions.V5,\n     )\n }   # type: dict[str, RoomVersion]\n", "issue": "Implement rooms v5\nSynapse v1.0 will default to rooms v4, however the intention is that it also ships with rooms v5 which is envisaged to be rooms v4 + https://github.com/matrix-org/synapse/issues/4364\r\n\r\nrooms v5 is yet to be MSC'd so does not formally exist at this point, this issue is a place holder.\n", "before_files": [{"content": "# -*- coding: utf-8 -*-\n# Copyright 2019 New Vector Ltd\n#\n# Licensed under the Apache License, Version 2.0 (the \"License\");\n# you may not use this file except in compliance with the License.\n# You may obtain a copy of the License at\n#\n#     http://www.apache.org/licenses/LICENSE-2.0\n#\n# Unless required by applicable law or agreed to in writing, software\n# distributed under the License is distributed on an \"AS IS\" BASIS,\n# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n# See the License for the specific language governing permissions and\n# limitations under the License.\nimport attr\n\n\nclass EventFormatVersions(object):\n    \"\"\"This is an internal enum for tracking the version of the event format,\n    independently from the room version.\n    \"\"\"\n    V1 = 1   # $id:server event id format\n    V2 = 2   # MSC1659-style $hash event id format: introduced for room v3\n    V3 = 3   # MSC1884-style $hash format: introduced for room v4\n\n\nKNOWN_EVENT_FORMAT_VERSIONS = {\n    EventFormatVersions.V1,\n    EventFormatVersions.V2,\n    EventFormatVersions.V3,\n}\n\n\nclass StateResolutionVersions(object):\n    \"\"\"Enum to identify the state resolution algorithms\"\"\"\n    V1 = 1   # room v1 state res\n    V2 = 2   # MSC1442 state res: room v2 and later\n\n\nclass RoomDisposition(object):\n    STABLE = \"stable\"\n    UNSTABLE = \"unstable\"\n\n\n@attr.s(slots=True, frozen=True)\nclass RoomVersion(object):\n    \"\"\"An object which describes the unique attributes of a room version.\"\"\"\n\n    identifier = attr.ib()      # str; the identifier for this version\n    disposition = attr.ib()     # str; one of the RoomDispositions\n    event_format = attr.ib()    # int; one of the EventFormatVersions\n    state_res = attr.ib()       # int; one of the StateResolutionVersions\n    enforce_key_validity = attr.ib()  # bool\n\n\nclass RoomVersions(object):\n    V1 = RoomVersion(\n        \"1\",\n        RoomDisposition.STABLE,\n        EventFormatVersions.V1,\n        StateResolutionVersions.V1,\n        enforce_key_validity=False,\n    )\n    V2 = RoomVersion(\n        \"2\",\n        RoomDisposition.STABLE,\n        EventFormatVersions.V1,\n        StateResolutionVersions.V2,\n        enforce_key_validity=False,\n    )\n    V3 = RoomVersion(\n        \"3\",\n        RoomDisposition.STABLE,\n        EventFormatVersions.V2,\n        StateResolutionVersions.V2,\n        enforce_key_validity=False,\n    )\n    V4 = RoomVersion(\n        \"4\",\n        RoomDisposition.STABLE,\n        EventFormatVersions.V3,\n        StateResolutionVersions.V2,\n        enforce_key_validity=False,\n    )\n    VDH_TEST_KEY_VALIDITY = RoomVersion(\n        \"vdh-test-key-validity\",\n        RoomDisposition.UNSTABLE,\n        EventFormatVersions.V3,\n        StateResolutionVersions.V2,\n        enforce_key_validity=False,\n    )\n\n\nKNOWN_ROOM_VERSIONS = {\n    v.identifier: v for v in (\n        RoomVersions.V1,\n        RoomVersions.V2,\n        RoomVersions.V3,\n        RoomVersions.V4,\n        RoomVersions.VDH_TEST_KEY_VALIDITY,\n    )\n}   # type: dict[str, RoomVersion]\n", "path": "synapse/api/room_versions.py"}]}