Add configuration option that disables federation

CHANGELOG.md

@@ -11,6 +11,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Added `fep-e232` feature flag (disabled by default).
 - Added `account_index` parameter to Monero configuration.
 - Added `/api/v1/instance/peers` API endpoint.
+- Added `federation.enabled` configuration parameter that can be used to disable federation.
 
 ### Changed
 

contrib/mitra_config.yaml

@@ -47,6 +47,7 @@ retention:
 
 # Federation parameters
 #federation:
+#  enabled: true
 #  # Proxy for outgoing requests
 #  #proxy_url: 'socks5h://127.0.0.1:9050'
 #  # Proxy for outgoing requests to .onion targets

mitra-config/src/config.rs

@@ -73,7 +73,7 @@ pub struct Config {
     pub(super) proxy_url: Option<String>,
 
     #[serde(default)]
-    pub(super) federation: FederationConfig,
+    pub federation: FederationConfig,
 
     #[serde(default)]
     pub blocked_instances: Vec<String>,
@@ -100,7 +100,10 @@ impl Config {
             actor_key: self.instance_rsa_key.clone().unwrap(),
             proxy_url: self.federation.proxy_url.clone(),
             onion_proxy_url: self.federation.onion_proxy_url.clone(),
-            is_private: matches!(self.environment, Environment::Development),
+            // Private instance doesn't send activities and sign requests
+            is_private:
+                !self.federation.enabled ||
+                matches!(self.environment, Environment::Development),
         }
     }
 

mitra-config/src/federation.rs

@@ -1,7 +1,21 @@
 use serde::Deserialize;
 
-#[derive(Clone, Default, Deserialize)]
+fn default_federation_enabled() -> bool { true }
+
+#[derive(Clone, Deserialize)]
 pub struct FederationConfig {
-    pub proxy_url: Option<String>,
-    pub onion_proxy_url: Option<String>,
+    #[serde(default = "default_federation_enabled")]
+    pub enabled: bool,
+    pub(super) proxy_url: Option<String>,
+    pub(super) onion_proxy_url: Option<String>,
+}
+
+impl Default for FederationConfig {
+    fn default() -> Self {
+        Self {
+            enabled: default_federation_enabled(),
+            proxy_url: None,
+            onion_proxy_url: None,
+        }
+    }
 }

src/activitypub/fetcher/fetchers.rs

@@ -75,7 +75,7 @@ fn build_request(
 ) -> RequestBuilder {
     let mut request_builder = client.request(method, url);
     if !instance.is_private {
-        // Public instance should set User-Agent header
+        // Public instances should set User-Agent header
         request_builder = request_builder
             .header(reqwest::header::USER_AGENT, instance.agent());
     };
@@ -96,7 +96,7 @@ async fn send_request(
         request_builder = request_builder.query(query_params);
     };
     if !instance.is_private {
-        // Only public instance can send signed request
+        // Only public instances can send signed requests
         let instance_actor_id = local_instance_actor_id(&instance.url());
         let instance_actor_key_id = local_actor_key_id(&instance_actor_id);
         let headers = create_http_signature(

src/activitypub/views.rs

@@ -106,6 +106,9 @@ async fn inbox(
     request: HttpRequest,
     activity: web::Json<serde_json::Value>,
 ) -> Result<HttpResponse, HttpError> {
+    if !config.federation.enabled {
+        return Err(HttpError::PermissionError);
+    };
     log::debug!("received activity: {}", activity);
     let activity_type = activity["type"].as_str().unwrap_or("Unknown");
     log::info!("received in {}: {}", request.uri().path(), activity_type);
@@ -304,8 +307,12 @@ async fn instance_actor_view(
 
 #[post("/inbox")]
 async fn instance_actor_inbox(
+    config: web::Data<Config>,
     activity: web::Json<serde_json::Value>,
 ) -> Result<HttpResponse, HttpError> {
+    if !config.federation.enabled {
+        return Err(HttpError::PermissionError);
+    };
     log::info!(
         "received in instance inbox: {}",
         activity["type"].as_str().unwrap_or("Unknown"),

src/nodeinfo/types.rs

@@ -68,11 +68,17 @@ pub struct Usage {
     pub local_posts: i64,
 }
 
+#[derive(Serialize)]
+struct FederationMetadata {
+    enabled: bool,
+}
+
 #[derive(Serialize)]
 #[serde(rename_all = "camelCase")]
 struct Metadata {
     node_name: String,
     node_description: String,
+    federation: FederationMetadata,
 }
 
 impl Metadata {
@@ -80,6 +86,9 @@ impl Metadata {
         Self {
             node_name: config.instance_title.clone(),
             node_description: config.instance_short_description.clone(),
+            federation: FederationMetadata {
+                enabled: config.federation.enabled,
+            },
         }
     }
 }