Implement stable support for MSC3882 to allow an existing device/session to generate a login token for use on a new device/session (#15388)

Implements stable support for MSC3882; this involves updating Synapse's support to
match the MSC / the spec says.

Continue to support the unstable version to allow clients to transition.

1 files changed, 3 insertions, 10 deletions

diff --git a/synapse/config/experimental.py b/synapse/config/experimental.py
index 1d189b2e26..a9e002cf08 100644
--- a/synapse/config/experimental.py
+++ b/synapse/config/experimental.py
@@ -192,10 +192,10 @@ class MSC3861:
                 ("captcha", "enable_registration_captcha"),
             )
 
-        if root.experimental.msc3882_enabled:
+        if root.auth.login_via_existing_enabled:
             raise ConfigError(
-                "MSC3882 cannot be enabled when OAuth delegation is enabled",
-                ("experimental_features", "msc3882_enabled"),
+                "Login via existing session cannot be enabled when OAuth delegation is enabled",
+                ("login_via_existing_session", "enabled"),
             )
 
         if root.registration.refresh_token_lifetime:
@@ -319,13 +319,6 @@ class ExperimentalConfig(Config):
         # MSC3881: Remotely toggle push notifications for another client
         self.msc3881_enabled: bool = experimental.get("msc3881_enabled", False)
 
-        # MSC3882: Allow an existing session to sign in a new session
-        self.msc3882_enabled: bool = experimental.get("msc3882_enabled", False)
-        self.msc3882_ui_auth: bool = experimental.get("msc3882_ui_auth", True)
-        self.msc3882_token_timeout = self.parse_duration(
-            experimental.get("msc3882_token_timeout", "5m")
-        )
-
         # MSC3874: Filtering /messages with rel_types / not_rel_types.
         self.msc3874_enabled: bool = experimental.get("msc3874_enabled", False)