feat: Allow self-service deactivation to be disabled

src/web/pages/account/deactivate.rs

@@ -30,6 +30,7 @@ template! {
 #[derive(Debug)]
 #[allow(clippy::large_enum_variant)]
 enum DeactivateBody {
+	Unavailable,
 	Form {
 		user_id: OwnedUserId,
 		user_card: UserCard,
@@ -67,7 +68,9 @@ async fn route_deactivate(
 	let user_card = UserCard::for_local_user(&services, user_id.clone()).await;
 
 	let body = {
-		if let Some(form) = form {
+		if !services.config.allow_deactivation {
+			DeactivateBody::Unavailable
+		} else if let Some(form) = form {
 			if let Err(err) = validate_deactivate_form(&services, &user_id, form).await {
 				DeactivateBody::Form {
 					user_id,

src/web/pages/templates/deactivate.html.j2

@@ -5,9 +5,18 @@ Deactivate your account
 {%- endblock -%}
 
 {%- block content -%}
+{% match body %}
+    {% when DeactivateBody::Form { .. } | DeactivateBody::Success %}
 <div class="panel">
+    {% when DeactivateBody::Unavailable %}
+<div class="panel middle"/>
+{% endmatch %}
     <h1>Deactivate your account <a class="back" href="{{ crate::ROUTE_PREFIX }}/account/">Back</a></h1>
     {% match body %}
+        {% when DeactivateBody::Unavailable %}
+            <p>
+                To deactivate your account, contact your homeserver's administrator.
+            </p>
         {% when DeactivateBody::Form { user_id, user_card, form } %}
             {{ user_card }}
             <p>