Room Version 6

changelogs/client_server/newsfragments/2563.clarification

@@ -0,0 +1 @@
+Move redaction algorithm into the room version specifications.

scripts/css/pygments.css

@@ -0,0 +1,83 @@
+/*
+Original styles generated from:
+    pygmentize -f html -S colorful -a pre.code > ./scripts/css/pygments.css
+
+Rules for which we don't want the syntax highlighter to kick in are commented
+out at the bottom.
+
+Windows users: if you regenerate this file, you'll need to re-save it as utf-8
+to make docutils happy.
+*/
+
+/* DIFFS */
+pre.code .gd { color: #A00000 } /* Generic.Deleted */
+pre.code .gi { color: #00A000 } /* Generic.Inserted */
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+/* UNUSED */
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scripts/gendoc.py

@@ -273,6 +273,7 @@ def rst2html(i, o, stylesheets):
                 writer_name="html",
                 settings_overrides={
                     "stylesheet_path": stylesheets,
+                    "syntax_highlight": "short",
                 },
             )
 

specification/appendices/signing_json.rst

@@ -39,6 +39,17 @@ range where they can be accurately represented using IEEE double precision
 floating point numbers since a number of JSON libraries represent all numbers
 using this representation.
 
+.. WARNING::
+   Events in room versions 1, 2, 3, 4, and 5 might not be fully compliant with
+   these restrictions. Servers SHOULD be capable of handling JSON which is considered
+   invalid by these restrictions where possible.
+
+   The most notable consideration is that integers might not be in the range
+   specified above.
+
+.. Note::
+   Float values are not permitted by this encoding.
+
 .. code:: python
 
  import json

specification/client_server_api.rst

@@ -1779,39 +1779,7 @@ redacted include a ``redacted_because`` key whose value is the event that caused
 it to be redacted, which may include a reason.
 
 
-Upon receipt of a redaction event, the server should strip off any keys not in
-the following list:
-
-- ``event_id``
-- ``type``
-- ``room_id``
-- ``sender``
-- ``state_key``
-- ``content``
-- ``hashes``
-- ``signatures``
-- ``depth``
-- ``prev_events``
-- ``prev_state``
-- ``auth_events``
-- ``origin``
-- ``origin_server_ts``
-- ``membership``
-
-.. Note:
-   Some of the keys, such as ``hashes``, will appear on the federation-formatted
-   event and therefore the client may not be aware of them.
-
-The content object should also be stripped of all keys, unless it is one of
-one of the following event types:
-
-- ``m.room.member`` allows key ``membership``.
-- ``m.room.create`` allows key ``creator``.
-- ``m.room.join_rules`` allows key ``join_rule``.
-- ``m.room.power_levels`` allows keys ``ban``, ``events``, ``events_default``,
-  ``kick``, ``redact``, ``state_default``, ``users``, ``users_default``.
-- ``m.room.aliases`` allows key ``aliases``.
-- ``m.room.history_visibility`` allows key ``history_visibility``.
+The exact algorithm to apply against an event is defined in the `room version specification`_.
 
 The server should add the event causing the redaction to the ``unsigned``
 property of the redacted event, under the ``redacted_because`` key. When a

specification/index.rst

@@ -550,6 +550,7 @@ The available room versions are:
 * `Version 3 <rooms/v3.html>`_ - **Stable**. Introduces events whose IDs are the event's hash.
 * `Version 4 <rooms/v4.html>`_ - **Stable**. Builds on v3 by using URL-safe base64 for event IDs.
 * `Version 5 <rooms/v5.html>`_ - **Stable**. Introduces enforcement of signing key validity periods.
+* `Version 6 <rooms/v6.html>`_ - **Stable**. Alters several authorization rules for events.
 
 Specification Versions
 ----------------------

specification/rooms/v1.rst

@@ -1,4 +1,5 @@
 .. Copyright 2017,2019 New Vector Ltd
+.. Copyright 2020 The Matrix.org Foundation C.I.C.
 ..
 .. Licensed under the Apache License, Version 2.0 (the "License");
 .. you may not use this file except in compliance with the License.
@@ -21,13 +22,57 @@ blocks for other room versions.
 .. contents:: Table of Contents
 .. sectnum::
 
+Client considerations
+---------------------
+
+Clients may need to consider some algorithms performed by the server for their own
+implementation.
+
+Redactions
+~~~~~~~~~~
+
+Upon receipt of a redaction event, the server must strip off any keys not in
+the following list:
+
+- ``event_id``
+- ``type``
+- ``room_id``
+- ``sender``
+- ``state_key``
+- ``content``
+- ``hashes``
+- ``signatures``
+- ``depth``
+- ``prev_events``
+- ``prev_state``
+- ``auth_events``
+- ``origin``
+- ``origin_server_ts``
+- ``membership``
+
+.. Note:
+   Some of the keys, such as ``hashes``, will appear on the federation-formatted
+   event and therefore the client may not be aware of them.
+
+The content object must also be stripped of all keys, unless it is one of
+one of the following event types:
+
+- ``m.room.member`` allows key ``membership``.
+- ``m.room.create`` allows key ``creator``.
+- ``m.room.join_rules`` allows key ``join_rule``.
+- ``m.room.power_levels`` allows keys ``ban``, ``events``, ``events_default``,
+  ``kick``, ``redact``, ``state_default``, ``users``, ``users_default``.
+- ``m.room.aliases`` allows key ``aliases``.
+- ``m.room.history_visibility`` allows key ``history_visibility``.
+
 Server implementation components
 --------------------------------
 
 .. WARNING::
    The information contained in this section is strictly for server implementors.
    Applications which use the Client-Server API are generally unaffected by the
-   details contained here, and can safely ignore their presence.
+   intricacies contained here. The section above regarding client considerations
+   is the resource that Client-Server API use cases should reference.
 
 
 The algorithms defined here should only apply to version 1 rooms. Other algorithms
@@ -112,7 +157,7 @@ The types of state events that affect authorization are:
 .. NOTE::
 
   Power levels are inferred from defaults when not explicitly supplied.
-  For example, mentions of the ``sender``'s power level can also refer 
+  For example, mentions of the ``sender``'s power level can also refer
   to the default power level for users in the room.
 
 The rules are as follows:
@@ -250,21 +295,21 @@ The rules are as follows:
    #. If there is no previous ``m.room.power_levels`` event in the room, allow.
 
    #. For the keys ``users_default``, ``events_default``,
-      ``state_default``, ``ban``, ``redact``, ``kick``, ``invite`` check if they 
+      ``state_default``, ``ban``, ``redact``, ``kick``, ``invite`` check if they
       were added, changed or removed. For each found alteration:
 
       i. If the current value is higher than the ``sender``'s current power level,
          reject.
 
       #. If the new value is higher than the ``sender``'s current power level,
          reject.
-         
-   #. For each entry being added, changed or removed in both the ``events`` and 
+
+   #. For each entry being added, changed or removed in both the ``events`` and
       ``users`` keys:
-      
+
       i. If the current value is higher than the ``sender``'s current power level,
          reject.
-         
+
       #. If the new value is higher than the ``sender``'s current power level,
          reject.
 
@@ -307,6 +352,12 @@ Events in version 1 rooms have the following structure:
 
 {{definition_ss_pdu}}
 
+Canonical JSON
+~~~~~~~~~~~~~~
+
+Servers MUST NOT strictly enforce the JSON format specified in the
+`appendices <../appendices.html#canonical-json>`_ for the reasons described there.
+
 
 .. _`auth events selection`: ../server_server/%SERVER_RELEASE_LABEL%.html#auth-events-selection
 .. _`Signing Events`: ../server_server/%SERVER_RELEASE_LABEL%.html#signing-events

specification/rooms/v6.rst

@@ -0,0 +1,100 @@
+.. Copyright 2020 The Matrix.org Foundation C.I.C.
+..
+.. Licensed under the Apache License, Version 2.0 (the "License");
+.. you may not use this file except in compliance with the License.
+.. You may obtain a copy of the License at
+..
+..     http://www.apache.org/licenses/LICENSE-2.0
+..
+.. Unless required by applicable law or agreed to in writing, software
+.. distributed under the License is distributed on an "AS IS" BASIS,
+.. WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+.. See the License for the specific language governing permissions and
+.. limitations under the License.
+
+Room Version 6
+==============
+
+This room version builds on `version 5 <v5.html>`_ while changing various
+authorization rules performed on events.
+
+.. contents:: Table of Contents
+.. sectnum::
+
+
+Client considerations
+---------------------
+
+The redaction algorithm has changed from `room version 1 <v1.html>`_ to remove
+all rules against events of type ``m.room.aliases``. Room versions 2, 3, 4, and
+5 all use v1's redaction algorithm. The algorithm is otherwise unchanged.
+
+
+Server implementation components
+--------------------------------
+
+.. WARNING::
+   The information contained in this section is strictly for server implementors.
+   Applications which use the Client-Server API are generally unaffected by the
+   intricacies contained here. The section above regarding client considerations
+   is the resource that Client-Server API use cases should reference.
+
+
+Room version 6 makes the following alterations to algorithms described in `room version 5 <v5.html>`_.
+
+Redactions
+~~~~~~~~~~
+
+As mentioned in the client considerations portion of this specification, all
+special meaning has been removed for events of type ``m.room.aliases``. The
+algorithm is otherwise unchanged.
+
+Authorization rules for events
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Like redactions, all rules relating specifically to events of type ``m.room.aliases``
+are removed. They must still pass authorization checks relating to state events.
+
+Additionally, the authorization rules for events of type ``m.room.power_levels``
+now include the content key ``notifications``. This new rule takes the place of the
+rule which checks the ``events`` and ``users`` keys.
+
+For completeness, the changes to the auth rules can be represented as follows:
+
+.. code:: diff
+
+     ...
+
+    -If type is `m.room.aliases`:
+    -
+    -   a. If event has no `state_key`, reject.
+    -   b. If sender's domain doesn't matches `state_key`, reject.
+    -   c. Otherwise, allow.
+
+     ...
+
+     If type is `m.room.power_levels`:
+
+     ...
+
+    -  * For each entry being added, changed or removed in both the `events` and `users` keys:
+    +  * For each entry being added, changed or removed in the `events`, `users`, and `notifications` keys:
+
+        i. If the current value is higher than the `sender`'s current power level, reject.
+
+        ii. If the new value is higher than the `sender`'s current power level, reject.
+
+     ...
+
+
+The remaining rules are the same as in `room version 3 <v3.html#authorization-rules-for-events>`_
+(the last inherited room version to specify the authorization rules).
+
+Canonical JSON
+~~~~~~~~~~~~~~
+
+Servers MUST strictly enforce the JSON format specified in the
+`appendices <../appendices.html#canonical-json>`_. This translates to a 400 ``M_BAD_JSON`` error
+on most endpoints, or discarding of events over federation. For example, the Federation API's
+``/send`` endpoint would discard the event whereas the Client Server API's ``/send/{eventType}``
+endpoint would return a ``M_BAD_JSON`` error.

specification/targets.yaml

@@ -45,6 +45,10 @@ targets:
     files:
       - rooms/v5.rst
     version_label: v5
+  rooms@v6: # this is translated to be rooms/v6.html
+    files:
+      - rooms/v6.rst
+    version_label: v6
   appendices:
     files:
       - appendices.rst