Use the new dedicated Synapse API

crates/cli/src/util.rs

@@ -17,7 +17,7 @@ use mas_data_model::{SessionExpirationConfig, SiteConfig};
 use mas_email::{MailTransport, Mailer};
 use mas_handlers::passwords::PasswordManager;
 use mas_matrix::{HomeserverConnection, ReadOnlyHomeserverConnection};
-use mas_matrix_synapse::SynapseConnection;
+use mas_matrix_synapse::{LegacySynapseConnection, SynapseConnection};
 use mas_policy::PolicyFactory;
 use mas_router::UrlBuilder;
 use mas_storage::{BoxRepositoryFactory, RepositoryAccess, RepositoryFactory};
@@ -469,14 +469,22 @@ pub fn homeserver_connection_from_config(
     http_client: reqwest::Client,
 ) -> Arc<dyn HomeserverConnection> {
     match config.kind {
-        HomeserverKind::Synapse => Arc::new(SynapseConnection::new(
+        HomeserverKind::Synapse | HomeserverKind::SynapseLegacy => {
+            Arc::new(LegacySynapseConnection::new(
+                config.homeserver.clone(),
+                config.endpoint.clone(),
+                config.secret.clone(),
+                http_client,
+            ))
+        }
+        HomeserverKind::SynapseModern => Arc::new(SynapseConnection::new(
             config.homeserver.clone(),
             config.endpoint.clone(),
             config.secret.clone(),
             http_client,
         )),
         HomeserverKind::SynapseReadOnly => {
-            let connection = SynapseConnection::new(
+            let connection = LegacySynapseConnection::new(
                 config.homeserver.clone(),
                 config.endpoint.clone(),
                 config.secret.clone(),

crates/config/src/sections/matrix.rs

@@ -27,15 +27,23 @@ fn default_endpoint() -> Url {
 #[derive(Debug, Clone, Serialize, Deserialize, JsonSchema, Default)]
 #[serde(rename_all = "snake_case")]
 pub enum HomeserverKind {
-    /// Homeserver is Synapse
+    /// Homeserver is Synapse, using the legacy API
+    ///
+    /// This will switch to using the modern API in a few releases.
     #[default]
     Synapse,
 
-    /// Homeserver is Synapse, in read-only mode
+    /// Homeserver is Synapse, using the legacy API, in read-only mode
     ///
     /// This is meant for testing rolling out Matrix Authentication Service with
     /// no risk of writing data to the homeserver.
     SynapseReadOnly,
+
+    /// Homeserver is Synapse, using the legacy API,
+    SynapseLegacy,
+
+    /// Homeserver is Synapse, with the modern API available
+    SynapseModern,
 }
 
 /// Configuration related to the Matrix homeserver

crates/matrix-synapse/src/error.rs

@@ -9,6 +9,16 @@ use async_trait::async_trait;
 use serde::Deserialize;
 use thiserror::Error;
 
+/// Encountered when trying to register a user ID which has been taken.
+/// — <https://spec.matrix.org/v1.10/client-server-api/#other-error-codes>
+pub(crate) const M_USER_IN_USE: &str = "M_USER_IN_USE";
+/// Encountered when trying to register a user ID which is not valid.
+/// — <https://spec.matrix.org/v1.10/client-server-api/#other-error-codes>
+pub(crate) const M_INVALID_USERNAME: &str = "M_INVALID_USERNAME";
+/// Encountered when trying to register a user ID reserved by an appservice.
+/// — <https://spec.matrix.org/v1.10/client-server-api/#other-error-codes>
+pub(crate) const M_EXCLUSIVE: &str = "M_EXCLUSIVE";
+
 /// Represents a Matrix error
 /// Ref: <https://spec.matrix.org/v1.10/client-server-api/#standard-error-response>
 #[derive(Debug, Deserialize)]