Interface to allow cross-signing reset using Synapse admin API

crates/matrix-synapse/src/lib.rs

@@ -130,6 +130,9 @@ struct SynapseDeactivateUserRequest {
     erase: bool,
 }
 
+#[derive(Serialize)]
+struct SynapseAllowCrossSigningResetRequest {}
+
 #[async_trait::async_trait]
 impl HomeserverConnection for SynapseConnection {
     type Error = anyhow::Error;
@@ -366,4 +369,37 @@ impl HomeserverConnection for SynapseConnection {
     async fn unset_displayname(&self, mxid: &str) -> Result<(), Self::Error> {
         self.set_displayname(mxid, "").await
     }
+
+    #[tracing::instrument(
+        name = "homeserver.allow_cross_signing_reset",
+        skip_all,
+        fields(
+            matrix.homeserver = self.homeserver,
+            matrix.mxid = mxid,
+        ),
+        err(Display),
+    )]
+    async fn allow_cross_signing_reset(&self, mxid: &str) -> Result<(), Self::Error> {
+        let mut client = self
+            .http_client_factory
+            .client("homeserver.allow_cross_signing_reset")
+            .request_bytes_to_body()
+            .json_request();
+
+        let request = self
+            .post(&format!(
+                "_synapse/admin/v1/users/{mxid}/_allow_cross_signing_replacement_without_uia"
+            ))
+            .body(SynapseAllowCrossSigningResetRequest {})?;
+
+        let response = client.ready().await?.call(request).await?;
+
+        if response.status() != StatusCode::OK {
+            return Err(anyhow::anyhow!(
+                "Failed to allow cross signing reset in Synapse"
+            ));
+        }
+
+        Ok(())
+    }
 }