Log Message:
Update chat/matrix-synapse to 1.20.0

Synapse 1.20.0 (2020-09-22)
===========================

No significant changes since v1.20.0rc5.

Removal warning
---------------

Historically, the [Synapse Admin
API](https://github.com/matrix-org/synapse/tree/master/docs) has been
accessible under the `/_matrix/client/api/v1/admin`,
`/_matrix/client/unstable/admin`, `/_matrix/client/r0/admin` and
`/_synapse/admin` prefixes. In a future release, we will be dropping support
for accessing Synapse's Admin API using the `/_matrix/client/*` prefixes. This
makes it easier for homeserver admins to lock down external access to the Admin
API endpoints.

Synapse 1.20.0rc5 (2020-09-18)
==============================

In addition to the below, Synapse 1.20.0rc5 also includes the bug fix that was \ 
included in 1.19.3.

Features
--------

- Add flags to the `/versions` endpoint for whether new rooms default to using \ 
E2EE. ([\#8343](https://github.com/matrix-org/synapse/issues/8343))

Bugfixes
--------

- Fix rate limiting of federation `/send` requests. \ 
([\#8342](https://github.com/matrix-org/synapse/issues/8342))
- Fix a longstanding bug where back pagination over federation could get stuck \ 
if it failed to handle a received event. \ 
([\#8349](https://github.com/matrix-org/synapse/issues/8349))

Internal Changes
----------------

- Blacklist [MSC2753](https://github.com/matrix-org/matrix-doc/pull/2753) \ 
SyTests until it is implemented. \ 
([\#8285](https://github.com/matrix-org/synapse/issues/8285))

Synapse 1.20.0rc4 (2020-09-16)
==============================

Synapse 1.20.0rc4 is identical to 1.20.0rc3, with the addition of the security \ 
fix that was included in 1.19.2.

Synapse 1.20.0rc3 (2020-09-11)
==============================

Bugfixes
--------

- Fix a bug introduced in v1.20.0rc1 where the wrong exception was raised when \ 
invalid JSON data is encountered. \ 
([\#8291](https://github.com/matrix-org/synapse/issues/8291))

Synapse 1.20.0rc2 (2020-09-09)
==============================

Bugfixes
--------

- Fix a bug introduced in v1.20.0rc1 causing some features related to \ 
notifications to misbehave following the implementation of unread counts. \ 
([\#8280](https://github.com/matrix-org/synapse/issues/8280))

Synapse 1.20.0rc1 (2020-09-08)
==============================

Removal warning
---------------

Some older clients used a [disallowed \ 
character](https://matrix.org/docs/spec/client_server/r0.6.1#post-matrix-client-r0-register-email-requesttoken) \ 
(`:`) in the `client_secret` parameter of various endpoints. The incorrect \ 
behaviour was allowed for backwards compatibility, but is now being removed from \ 
Synapse as most users have updated their client. Further context can be found at \ 
[\#6766](https://github.com/matrix-org/synapse/issues/6766).

Features
--------

- Add an endpoint to query your shared rooms with another user as an \ 
implementation of [MSC2666](https://github.com/matrix-org/matrix-doc/pull/2666). \ 
([\#7785](https://github.com/matrix-org/synapse/issues/7785))
- Iteratively encode JSON to avoid blocking the reactor. \ 
([\#8013](https://github.com/matrix-org/synapse/issues/8013), \ 
[\#8116](https://github.com/matrix-org/synapse/issues/8116))
- Add support for shadow-banning users (ignoring any message send requests). \ 
([\#8034](https://github.com/matrix-org/synapse/issues/8034), \ 
[\#8092](https://github.com/matrix-org/synapse/issues/8092), \ 
[\#8095](https://github.com/matrix-org/synapse/issues/8095), \ 
[\#8142](https://github.com/matrix-org/synapse/issues/8142), \ 
[\#8152](https://github.com/matrix-org/synapse/issues/8152), \ 
[\#8157](https://github.com/matrix-org/synapse/issues/8157), \ 
[\#8158](https://github.com/matrix-org/synapse/issues/8158), \ 
[\#8176](https://github.com/matrix-org/synapse/issues/8176))
- Use the default template file when its equivalent is not found in a custom \ 
template directory. \ 
([\#8037](https://github.com/matrix-org/synapse/issues/8037), \ 
[\#8107](https://github.com/matrix-org/synapse/issues/8107), \ 
[\#8252](https://github.com/matrix-org/synapse/issues/8252))
- Add unread messages count to sync responses, as specified in \ 
[MSC2654](https://github.com/matrix-org/matrix-doc/pull/2654). \ 
([\#8059](https://github.com/matrix-org/synapse/issues/8059), \ 
[\#8254](https://github.com/matrix-org/synapse/issues/8254), \ 
[\#8270](https://github.com/matrix-org/synapse/issues/8270), \ 
[\#8274](https://github.com/matrix-org/synapse/issues/8274))
- Optimise `/federation/v1/user/devices/` API by only returning devices with \ 
encryption keys. ([\#8198](https://github.com/matrix-org/synapse/issues/8198))

Bugfixes
--------

- Fix a memory leak by limiting the length of time that messages will be queued \ 
for a remote server that has been unreachable. \ 
([\#7864](https://github.com/matrix-org/synapse/issues/7864))
- Fix `Re-starting finished log context PUT-nnnn` warning when event persistence \ 
failed. ([\#8081](https://github.com/matrix-org/synapse/issues/8081))
- Synapse now correctly enforces the valid characters in the `client_secret` \ 
parameter used in various endpoints. \ 
([\#8101](https://github.com/matrix-org/synapse/issues/8101))
- Fix a bug introduced in v1.7.2 impacting message retention policies that would \ 
allow federated homeservers to dictate a retention period that's lower than the \ 
configured minimum allowed duration in the configuration file. \ 
([\#8104](https://github.com/matrix-org/synapse/issues/8104))
- Fix a long-standing bug where invalid JSON would be accepted by Synapse. \ 
([\#8106](https://github.com/matrix-org/synapse/issues/8106))
- Fix a bug introduced in Synapse v1.12.0 which could cause `/sync` requests to \ 
fail with a 404 if you had a very old outstanding room invite. \ 
([\#8110](https://github.com/matrix-org/synapse/issues/8110))
- Return a proper error code when the rooms of an invalid group are requested. \ 
([\#8129](https://github.com/matrix-org/synapse/issues/8129))
- Fix a bug which could cause a leaked postgres connection if synapse was set to \ 
daemonize. ([\#8131](https://github.com/matrix-org/synapse/issues/8131))
- Clarify the error code if a user tries to register with a numeric ID. This bug \ 
was introduced in v1.15.0. \ 
([\#8135](https://github.com/matrix-org/synapse/issues/8135))
- Fix a bug where appservices with ratelimiting disabled would still be \ 
ratelimited when joining rooms. This bug was introduced in v1.19.0. \ 
([\#8139](https://github.com/matrix-org/synapse/issues/8139))
- Fix logging in via OpenID Connect with a provider that uses integer user IDs. \ 
([\#8190](https://github.com/matrix-org/synapse/issues/8190))
- Fix a longstanding bug where user directory updates could break when \ 
unexpected profile data was included in events. \ 
([\#8223](https://github.com/matrix-org/synapse/issues/8223))
- Fix a longstanding bug where stats updates could break when unexpected profile \ 
data was included in events. \ 
([\#8226](https://github.com/matrix-org/synapse/issues/8226))
- Fix slow start times for large servers by removing a table scan of the `users` \ 
table from startup code. \ 
([\#8271](https://github.com/matrix-org/synapse/issues/8271))

Updates to the Docker image
---------------------------

- Fix builds of the Docker image on non-x86 platforms. \ 
([\#8144](https://github.com/matrix-org/synapse/issues/8144))
- Added curl for healthcheck support and readme updates for the change. \ 
Contributed by @maquis196. \ 
([\#8147](https://github.com/matrix-org/synapse/issues/8147))

Improved Documentation
----------------------

- Link to matrix-synapse-rest-password-provider in the password provider \ 
documentation. ([\#8111](https://github.com/matrix-org/synapse/issues/8111))
- Updated documentation to note that Synapse does not follow `HTTP 308` \ 
redirects due to an upstream library not supporting them. Contributed by Ryan \ 
Cole. ([\#8120](https://github.com/matrix-org/synapse/issues/8120))
- Explain better what GDPR-erased means when deactivating a user. \ 
([\#8189](https://github.com/matrix-org/synapse/issues/8189))

Internal Changes
----------------

- Add filter `name` to the `/users` admin API, which filters by user ID or \ 
displayname. Contributed by Awesome Technologies Innovationslabor GmbH. \ 
([\#7377](https://github.com/matrix-org/synapse/issues/7377), \ 
[\#8163](https://github.com/matrix-org/synapse/issues/8163))
- Reduce run times of some unit tests by advancing the reactor a fewer number of \ 
times. ([\#7757](https://github.com/matrix-org/synapse/issues/7757))
- Don't fail `/submit_token` requests on incorrect session ID if \ 
`request_token_inhibit_3pid_errors` is turned on. \ 
([\#7991](https://github.com/matrix-org/synapse/issues/7991))
- Convert various parts of the codebase to async/await. \ 
([\#8071](https://github.com/matrix-org/synapse/issues/8071), \ 
[\#8072](https://github.com/matrix-org/synapse/issues/8072), \ 
[\#8074](https://github.com/matrix-org/synapse/issues/8074), \ 
[\#8075](https://github.com/matrix-org/synapse/issues/8075), \ 
[\#8076](https://github.com/matrix-org/synapse/issues/8076), \ 
[\#8087](https://github.com/matrix-org/synapse/issues/8087), \ 
[\#8100](https://github.com/matrix-org/synapse/issues/8100), \ 
[\#8119](https://github.com/matrix-org/synapse/issues/8119), \ 
[\#8121](https://github.com/matrix-org/synapse/issues/8121), \ 
[\#8133](https://github.com/matrix-org/synapse/issues/8133), \ 
[\#8156](https://github.com/matrix-org/synapse/issues/8156), \ 
[\#8162](https://github.com/matrix-org/synapse/issues/8162), \ 
[\#8166](https://github.com/matrix-org/synapse/issues/8166), \ 
[\#8168](https://github.com/matrix-org/synapse/issues/8168), \ 
[\#8173](https://github.com/matrix-org/synapse/issues/8173), [\#8191](https://g
ithub.com/matrix-org/synapse/issues/8191), \ 
[\#8192](https://github.com/matrix-org/synapse/issues/8192), \ 
[\#8193](https://github.com/matrix-org/synapse/issues/8193), \ 
[\#8194](https://github.com/matrix-org/synapse/issues/8194), \ 
[\#8195](https://github.com/matrix-org/synapse/issues/8195), \ 
[\#8197](https://github.com/matrix-org/synapse/issues/8197), \ 
[\#8199](https://github.com/matrix-org/synapse/issues/8199), \ 
[\#8200](https://github.com/matrix-org/synapse/issues/8200), \ 
[\#8201](https://github.com/matrix-org/synapse/issues/8201), \ 
[\#8202](https://github.com/matrix-org/synapse/issues/8202), \ 
[\#8207](https://github.com/matrix-org/synapse/issues/8207), \ 
[\#8213](https://github.com/matrix-org/synapse/issues/8213), \ 
[\#8214](https://github.com/matrix-org/synapse/issues/8214))
- Remove some unused database functions. \ 
([\#8085](https://github.com/matrix-org/synapse/issues/8085))
- Add type hints to various parts of the codebase. \ 
([\#8090](https://github.com/matrix-org/synapse/issues/8090), \ 
[\#8127](https://github.com/matrix-org/synapse/issues/8127), \ 
[\#8187](https://github.com/matrix-org/synapse/issues/8187), \ 
[\#8241](https://github.com/matrix-org/synapse/issues/8241), \ 
[\#8140](https://github.com/matrix-org/synapse/issues/8140), \ 
[\#8183](https://github.com/matrix-org/synapse/issues/8183), \ 
[\#8232](https://github.com/matrix-org/synapse/issues/8232), \ 
[\#8235](https://github.com/matrix-org/synapse/issues/8235), \ 
[\#8237](https://github.com/matrix-org/synapse/issues/8237), \ 
[\#8244](https://github.com/matrix-org/synapse/issues/8244))
- Return the previous stream token if a non-member event is a duplicate. \ 
([\#8093](https://github.com/matrix-org/synapse/issues/8093), \ 
[\#8112](https://github.com/matrix-org/synapse/issues/8112))
- Separate `get_current_token` into two since there are two different use cases \ 
for it. ([\#8113](https://github.com/matrix-org/synapse/issues/8113))
- Remove `ChainedIdGenerator`. \ 
([\#8123](https://github.com/matrix-org/synapse/issues/8123))
- Reduce the amount of whitespace in JSON stored and sent in responses. \ 
([\#8124](https://github.com/matrix-org/synapse/issues/8124))
- Update the test federation client to handle streaming responses. \ 
([\#8130](https://github.com/matrix-org/synapse/issues/8130))
- Micro-optimisations to `get_auth_chain_ids`. \ 
([\#8132](https://github.com/matrix-org/synapse/issues/8132))
- Refactor `StreamIdGenerator` and `MultiWriterIdGenerator` to have the same \ 
interface. ([\#8161](https://github.com/matrix-org/synapse/issues/8161))
- Add functions to `MultiWriterIdGen` used by events stream. \ 
([\#8164](https://github.com/matrix-org/synapse/issues/8164), \ 
[\#8179](https://github.com/matrix-org/synapse/issues/8179))
- Fix tests that were broken due to the merge of 1.19.1. \ 
([\#8167](https://github.com/matrix-org/synapse/issues/8167))
- Make `SlavedIdTracker.advance` have the same interface as \ 
`MultiWriterIDGenerator`. \ 
([\#8171](https://github.com/matrix-org/synapse/issues/8171))
- Remove unused `is_guest` parameter from, and add safeguard to, \ 
`MessageHandler.get_room_data`. \ 
([\#8174](https://github.com/matrix-org/synapse/issues/8174), \ 
[\#8181](https://github.com/matrix-org/synapse/issues/8181))
- Standardize the mypy configuration. \ 
([\#8175](https://github.com/matrix-org/synapse/issues/8175))
- Refactor some of `LoginRestServlet`'s helper methods, and move them to \ 
`AuthHandler` for easier reuse. \ 
([\#8182](https://github.com/matrix-org/synapse/issues/8182))
- Fix `wait_for_stream_position` to allow multiple waiters on same stream ID. \ 
([\#8196](https://github.com/matrix-org/synapse/issues/8196))
- Make `MultiWriterIDGenerator` work for streams that use negative values. \ 
([\#8203](https://github.com/matrix-org/synapse/issues/8203))
- Refactor queries for device keys and cross-signatures. \ 
([\#8204](https://github.com/matrix-org/synapse/issues/8204), \ 
[\#8205](https://github.com/matrix-org/synapse/issues/8205), \ 
[\#8222](https://github.com/matrix-org/synapse/issues/8222), \ 
[\#8224](https://github.com/matrix-org/synapse/issues/8224), \ 
[\#8225](https://github.com/matrix-org/synapse/issues/8225), \ 
[\#8231](https://github.com/matrix-org/synapse/issues/8231), \ 
[\#8233](https://github.com/matrix-org/synapse/issues/8233), \ 
[\#8234](https://github.com/matrix-org/synapse/issues/8234))
- Fix type hints for functions decorated with `@cached`. \ 
([\#8240](https://github.com/matrix-org/synapse/issues/8240))
- Remove obsolete `order` field from federation send queues. \ 
([\#8245](https://github.com/matrix-org/synapse/issues/8245))
- Stop sub-classing from object. \ 
([\#8249](https://github.com/matrix-org/synapse/issues/8249))
- Add more logging to debug slow startup. \ 
([\#8264](https://github.com/matrix-org/synapse/issues/8264))
- Do not attempt to upgrade database schema on worker processes. \ 
([\#8266](https://github.com/matrix-org/synapse/issues/8266), \ 
[\#8276](https://github.com/matrix-org/synapse/issues/8276))